Home

Context Navigation

multi_agent_system_mod.f90 @ 4847

Last change on this file since 4847 was 4843, checked in by raasch, 4 years ago
local namelist parameter added to switch off the module although the respective module namelist appears in the namelist file, further copyright updates
Property svn:keywords set to `Id`
File size: 190.9 KB

Line
1	!> @file multi_agent_system_mod.f90
2	!--------------------------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms of the GNU General
6	! Public License as published by the Free Software Foundation, either version 3 of the License, or
7	! (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
10	! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
11	! Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with PALM. If not, see
14	! <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 2016-2021 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: multi_agent_system_mod.f90 4843 2021-01-15 15:22:11Z raasch $
26	! local namelist parameter added to switch off the module although the respective module namelist
27	! appears in the namelist file
28	!
29	! 4842 2021-01-14 10:42:28Z raasch
30	! reading of namelist file and actions in case of namelist errors revised so that statement labels
31	! and goto statements are not required any more
32	!
33	! 4828 2021-01-05 11:21:41Z Giersch
34	! file re-formatted to follow the PALM coding standard
35	!
36	! 4623 2020-07-24 08:42:02Z raasch
37	! some switches calculated explicitly to avoid compiler warnings
38	!
39	! 4481 2020-03-31 18:55:54Z maronga
40	! bugfix: cpp-directives for serial mode added
41	!
42	! 4346 2019-12-18 11:55:56Z motisi
43	! Removed wall_flags_static_0 from USE statements as it's not used within the module
44	!
45	! 4329 2019-12-10 15:46:36Z motisi
46	! Renamed wall_flags_0 to wall_flags_static_0
47	!
48	! 4307 2019-11-26 14:12:36Z maronga
49	! Activated output of iPT
50	!
51	! 4182 2019-08-22 15:20:23Z scharf
52	! Corrected "Former revisions" section
53	!
54	! 4168 2019-08-16 13:50:17Z suehring
55	! Replace function get_topography_top_index by topo_top_ind
56	!
57	! 3987 2019-05-22 09:52:13Z kanani
58	! Introduce alternative switch for debug output during timestepping
59	!
60	! 3885 2019-04-11 11:29:34Z kanani
61	! Changes related to global restructuring of location messages and introduction of additional debug
62	! messages
63	!
64	! 3876 2019-04-08 18:41:49Z knoop
65	! replaced nspec by nvar: only variable species should bconsidered, fixed species are not relevant
66	!
67	! 3766 2019-02-26 16:23:41Z raasch
68	! save attribute added to local targets to avoid outlive pointer target warning
69	!
70	! 3665 2019-01-10 08:28:24Z raasch
71	! unused variables removed
72	!
73	! 3159 2018-07-20 11:20:01Z sward
74	! Initial revision
75	!
76	!
77	!
78	! Authors:
79	! --------
80	! @author sward
81	!
82	!
83	! Description:
84	! ------------
85	!> Multi Agent System for the simulation of pedestrian movement in urban environments
86	!--------------------------------------------------------------------------------------------------!
87	MODULE multi_agent_system_mod
88
89	USE, INTRINSIC :: ISO_C_BINDING
90
91	USE basic_constants_and_equations_mod, &
92	ONLY: pi
93
94	USE control_parameters, &
95	ONLY: biometeorology, &
96	debug_output_timestep, &
97	dt_3d, &
98	dt_write_agent_data, &
99	message_string, &
100	time_since_reference_point
101
102	USE cpulog, &
103	ONLY: cpu_log, log_point, log_point_s
104
105	USE grid_variables, &
106	ONLY: ddx, ddy, dx, dy
107
108	USE indices, &
109	ONLY: nx, nxl, nxlg, nxr, nxrg, ny, nyn, nyng, nys, nysg, nzb, topo_top_ind
110
111	USE random_function_mod, &
112	ONLY: random_function
113
114	USE kinds
115
116	USE pegrid
117
118	INTEGER(iwp), PARAMETER :: max_number_of_agent_groups = 100 !< maximum allowed number of agent groups
119	INTEGER(iwp), PARAMETER :: nr_2_direction_move = 10000 !< parameter for agent exchange
120	INTEGER(iwp), PARAMETER :: phase_init = 1 !< phase parameter
121	INTEGER(iwp), PARAMETER :: phase_release = 2 !< phase parameter
122
123	CHARACTER(LEN=15) :: bc_mas_lr = 'absorb' !< left/right boundary condition
124	CHARACTER(LEN=15) :: bc_mas_ns = 'absorb' !< north/south boundary condition
125
126	INTEGER(iwp) :: agt_path_size = 15 !< size of agent path array
127	INTEGER(iwp) :: deleted_agents = 0 !< number of deleted agents per time step
128	INTEGER(iwp) :: dim_size_agtnum_manual = 9999999 !< namelist parameter (see documentation)
129	INTEGER(iwp) :: heap_count !< number of items in binary heap (for pathfinding)
130	INTEGER(iwp) :: ibc_mas_lr !< agent left/right boundary condition dummy
131	INTEGER(iwp) :: ibc_mas_ns !< agent north/south boundary condition dummy
132	! INTEGER(iwp) :: ind_pm10 = -9 !< chemical species index of PM10
133	! INTEGER(iwp) :: ind_pm25 = -9 !< chemical species index of PM2.5
134	INTEGER(iwp) :: iran_agent = -1234567 !< number for random generator
135	INTEGER(iwp) :: min_nr_agent = 2 !< namelist parameter (see documentation)
136	#if defined( __parallel )
137	INTEGER(iwp) :: ghla_count_recv !< number of agents in left ghost layer
138	INTEGER(iwp) :: ghna_count_recv !< number of agents in north ghost layer
139	INTEGER(iwp) :: ghra_count_recv !< number of agents in right ghost layer
140	INTEGER(iwp) :: ghsa_count_recv !< number of agents in south ghost layer
141	INTEGER(iwp) :: nr_move_north !< number of agts to move north during exchange_horiz
142	INTEGER(iwp) :: nr_move_south !< number of agts to move south during exchange_horiz
143	#endif
144	INTEGER(iwp) :: maximum_number_of_agents = 0 !< maximum number of agents during run
145	INTEGER(iwp) :: number_of_agents = 0 !< number of agents for each grid box (3d array is saved on agt_count)
146	INTEGER(iwp) :: number_of_agent_groups = 1 !< namelist parameter (see documentation)
147	INTEGER(iwp) :: sort_count_mas = 0 !< counter for sorting agents
148	INTEGER(iwp) :: step_dealloc_mas = 100 !< namelist parameter (see documentation)
149	INTEGER(iwp) :: total_number_of_agents !< total number of agents in the whole model domain
150
151	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: agt_count !< 3d array of number of agents of every grid box
152	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: s_measure_height !< k-index(s-grid) for measurement
153	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: top_top_s !< k-index of first s-gridpoint above topography
154	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: top_top_w !< k-index of first v-gridpoint above topography
155	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: obstacle_flags !< flags to identify corners and edges of topography that cannot
156	!< be crossed by agents
157
158	LOGICAL :: deallocate_memory_mas = .TRUE. !< namelist parameter (see documentation)
159	LOGICAL :: dt_3d_reached_mas !< flag: agent timestep has reached model timestep
160	LOGICAL :: dt_3d_reached_l_mas !< flag: agent timestep has reached model timestep
161	LOGICAL :: agents_active = .FALSE. !< flag for agent system
162	LOGICAL :: random_start_position_agents = .TRUE. !< namelist parameter (see documentation)
163	LOGICAL :: read_agents_from_restartfile = .FALSE. !< namelist parameter (see documentation)
164	LOGICAL :: agent_own_timestep = .FALSE. !< namelist parameter (see documentation)
165
166	LOGICAL, DIMENSION(max_number_of_agent_groups) :: a_rand_target = .FALSE. !< namelist parameter (see documentation)
167
168	REAL(wp) :: agent_maximum_age = 9999999.9_wp !< namelist parameter (see documentation)
169	REAL(wp) :: agent_substep_time = 0.0_wp !< time measurement during one LES timestep
170	REAL(wp) :: alloc_factor_mas = 20.0_wp !< namelist parameter (see documentation)
171	REAL(wp) :: coll_t_0 = 3. !< namelist parameter (see documentation)
172	REAL(wp) :: corner_gate_start = 0.5_wp !< namelist parameter (see documentation)
173	REAL(wp) :: corner_gate_width = 1.0_wp !< namelist parameter (see documentation)
174	REAL(wp) :: dim_size_factor_agtnum = 1.0_wp !< namelist parameter (see documentation)
175	REAL(wp) :: d_sigma_rep_agent !< inverse of sigma_rep_agent
176	REAL(wp) :: d_sigma_rep_wall !< inverse of sigma_rep_wall
177	REAL(wp) :: d_tau_accel_agent !< inverse of tau_accel_agent
178	REAL(wp) :: desired_speed = 1.2_wp !< namelist parameter (see documentation)
179	REAL(wp) :: des_sp_sig = .2_wp !< namelist parameter (see documentation)
180	REAL(wp) :: dist_target_reached = 2.0_wp !< distance at which target counts as reached
181	REAL(wp) :: dist_to_int_target = .25_wp !< namelist parameter (see documentation)
182	REAL(wp) :: dt_agent = 0.02_wp !< namelist parameter (see documentation)
183	REAL(wp) :: dt_arel = 9999999.9_wp !< namelist parameter (see documentation)
184	REAL(wp) :: end_time_arel = 9999999.9_wp !< namelist parameter (see documentation)
185	REAL(wp) :: force_x !< dummy value for force on current agent in x-direction
186	REAL(wp) :: force_y !< dummy value for force on current agent in y-direction
187	REAL(wp) :: max_dist_from_path = 0.25_wp !< distance from current path at which a new path is calculated
188	REAL(wp) :: radius_agent = .25_wp !< namelist parameter (see documentation)
189	REAL(wp) :: repuls_agent = 1.5_wp !< namelist parameter (see documentation)
190	REAL(wp) :: repuls_wall = 7.0_wp !< namelist parameter (see documentation)
191	REAL(wp) :: scan_radius_agent = 3.0_wp !< namelist parameter (see documentation)
192	REAL(wp) :: scan_radius_wall = 2.0_wp !< namelist parameter (see documentation)
193	REAL(wp) :: sigma_rep_agent = 0.3_wp !< namelist parameter (see documentation)
194	REAL(wp) :: sigma_rep_wall = 0.1_wp !< namelist parameter (see documentation)
195	REAL(wp) :: tau_accel_agent = 0.5_wp !< namelist parameter (see documentation)
196	REAL(wp) :: time_arel = 0.0_wp !< time for agent release
197	REAL(wp) :: time_write_agent_data = 0.0_wp !< write agent data at current time on file
198	REAL(wp) :: v_max_agent = 1.3_wp !< namelist parameter (see documentation)
199
200	REAL(wp), DIMENSION(:), ALLOCATABLE :: dummy_path_x !< dummy path (x-coordinate)
201	REAL(wp), DIMENSION(:), ALLOCATABLE :: dummy_path_y !< dummy path (y-coordinate)
202
203	REAL(wp), DIMENSION(max_number_of_agent_groups) :: adx = 9999999.9_wp !< namelist parameter (see documentation)
204	REAL(wp), DIMENSION(max_number_of_agent_groups) :: ady = 9999999.9_wp !< namelist parameter (see documentation)
205	REAL(wp), DIMENSION(max_number_of_agent_groups) :: asl = 9999999.9_wp !< namelist parameter (see documentation)
206	REAL(wp), DIMENSION(max_number_of_agent_groups) :: asn = 9999999.9_wp !< namelist parameter (see documentation)
207	REAL(wp), DIMENSION(max_number_of_agent_groups) :: asr = 9999999.9_wp !< namelist parameter (see documentation)
208	REAL(wp), DIMENSION(max_number_of_agent_groups) :: ass = 9999999.9_wp !< namelist parameter (see documentation)
209	REAL(wp), DIMENSION(max_number_of_agent_groups) :: at_x = 9999999.9_wp !< namelist parameter (see documentation)
210	REAL(wp), DIMENSION(max_number_of_agent_groups) :: at_y = 9999999.9_wp !< namelist parameter (see documentation)
211	!
212	!-- Type for the definition of an agent
213	TYPE agent_type
214	INTEGER(iwp) :: block_nr !< number for sorting
215	INTEGER(iwp) :: group !< number of agent group
216	INTEGER(idp) :: id !< particle ID (64 bit integer)
217	INTEGER(iwp) :: path_counter !< current target along path (path_x/y)
218	LOGICAL :: agent_mask !< if this parameter is set to false the agent will be deleted
219	REAL(wp) :: age !< age of agent
220	REAL(wp) :: age_m !< age of agent
221	REAL(wp) :: dt_sum !< sum of agents subtimesteps
222	REAL(wp) :: clo !< clothing index
223	REAL(wp) :: energy_storage !< energy stored by agent
224	REAL(wp) :: clothing_temp !< energy stored by agent
225	REAL(wp) :: actlev !< metabolic + work energy of the person
226	REAL(wp) :: age_years !< physical age of the person
227	REAL(wp) :: weight !< total weight of the person (kg)
228	REAL(wp) :: height !< height of the person (m)
229	REAL(wp) :: work !< workload of the agent (W)
230	INTEGER(iwp) :: sex !< agents gender: 1 = male, 2 = female
231	REAL(wp) :: force_x !< force term x-direction
232	REAL(wp) :: force_y !< force term y-direction
233	REAL(wp) :: origin_x !< origin x-position of agent
234	REAL(wp) :: origin_y !< origin y-position of agent
235	REAL(wp) :: pm10 !< PM10 concentration at agent position
236	REAL(wp) :: pm25 !< PM25 concentration at agent position
237	REAL(wp) :: speed_abs !< absolute value of agent speed
238	REAL(wp) :: speed_e_x !< normalized speed of agent in x
239	REAL(wp) :: speed_e_y !< normalized speed of agent in y
240	REAL(wp) :: speed_des !< agent's desired speed
241	REAL(wp) :: speed_x !< speed of agent in x
242	REAL(wp) :: speed_y !< speed of agent in y
243	REAL(wp) :: ipt !< instationary thermal index iPT (degree_C)
244	REAL(wp) :: windspeed !< absolute value of windspeed at agent position
245	REAL(wp) :: x !< x-position
246	REAL(wp) :: y !< y-position
247	REAL(wp) :: t !< temperature
248	REAL(wp) :: t_x !< x-position
249	REAL(wp) :: t_y !< y-position
250	REAL(wp), DIMENSION(0:15) :: path_x !< agent path to target (x)
251	REAL(wp), DIMENSION(0:15) :: path_y !< agent path to target (y)
252	END TYPE agent_type
253
254	TYPE(agent_type) :: zero_agent !< zero agent to avoid weird thing
255
256	TYPE(agent_type), DIMENSION(:), POINTER :: agents !< Agent array for this grid cell
257	#if defined( __parallel )
258	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_l !< ghost layer left of pe domain
259	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_n !< ghost layer north of pe domain
260	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_r !< ghost layer right of pe domain
261	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_s !< ghost layer south of pe domain
262	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: move_also_north !< for agent exchange between PEs
263	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: move_also_south !< for agent exchange between PEs
264	#endif
265	!
266	!-- Type for 2D grid on which agents are stored
267	TYPE grid_agent_def
268	INTEGER(iwp), DIMENSION(0:3) :: start_index !< start agent index for current block
269	INTEGER(iwp), DIMENSION(0:3) :: end_index !< end agent index for current block
270	INTEGER(iwp) :: id_counter !< agent id counter (removeable?)
271	LOGICAL :: time_loop_done !< timestep loop for agent advection
272	TYPE(agent_type), POINTER, DIMENSION(:) :: agents !< Particle array for this grid cell
273	END TYPE grid_agent_def
274
275	TYPE(grid_agent_def), DIMENSION(:,:), ALLOCATABLE, TARGET :: grid_agents !< 2D grid on which agents are stored
276	!
277	!-- Item in a priority queue (binary heap)
278	TYPE heap_item
279	INTEGER(iwp) :: mesh_id !< id of the submitted mesh point
280	REAL(wp) :: priority !< priority of the mesh point (= distance so far + heuristic to goal)
281	END TYPE heap_item
282
283	TYPE(heap_item), DIMENSION(:), ALLOCATABLE :: queue !< priority queue realized as binary heap
284	!
285	!-- Type for mesh point in visibility graph
286	TYPE mesh_point
287	INTEGER(iwp) :: polygon_id !< Polygon the point belongs to
288	INTEGER(iwp) :: vertex_id !< Vertex in the polygon
289	INTEGER(iwp) :: noc !< number of connections
290	INTEGER(iwp) :: origin_id !< ID of previous mesh point on path (A*)
291	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: connected_vertices !< Index of connected vertices
292	REAL(wp) :: cost_so_far !< Cost to reach this mesh point (A*)
293	REAL(wp) :: x !< x-coordinate
294	REAL(wp) :: y !< y-coordinate
295	REAL(wp) :: x_s !< corner shifted outward from building by 1m (x)
296	REAL(wp) :: y_s !< corner shifted outward from building by 1m (y)
297	REAL(wp), DIMENSION(:), ALLOCATABLE :: distance_to_vertex !< Distance to each vertex
298	END TYPE mesh_point
299
300	TYPE(mesh_point), DIMENSION(:), ALLOCATABLE :: mesh !< navigation mesh
301	TYPE(mesh_point), DIMENSION(:), ALLOCATABLE :: tmp_mesh !< temporary navigation mesh
302	!
303	!-- Vertex of a polygon
304	TYPE vertex_type
305	LOGICAL :: delete !< Flag to mark vertex for deletion
306	REAL(wp) :: x !< x-coordinate
307	REAL(wp) :: y !< y-coordinate
308	END TYPE vertex_type
309	!
310	!-- Polygon containing a number of vertices
311	TYPE polygon_type
312	INTEGER(iwp) :: nov !< Number of vertices in this polygon
313	TYPE(vertex_type), DIMENSION(:), ALLOCATABLE :: vertices !< Array of vertices
314	END TYPE polygon_type
315
316	TYPE(polygon_type), DIMENSION(:), ALLOCATABLE :: polygons !< Building data in polygon form
317
318	SAVE
319
320	PRIVATE
321	!
322	!-- Public functions
323	PUBLIC mas_init, mas_last_actions, mas_parin, multi_agent_system
324
325	!
326	!-- Public parameters, constants and initial values
327	PUBLIC agents_active
328
329	INTERFACE mas_parin
330	MODULE PROCEDURE mas_parin
331	END INTERFACE mas_parin
332
333	INTERFACE mas_init
334	MODULE PROCEDURE mas_init
335	END INTERFACE mas_init
336
337	INTERFACE mas_last_actions
338	MODULE PROCEDURE mas_last_actions
339	END INTERFACE mas_last_actions
340
341	INTERFACE multi_agent_system
342	MODULE PROCEDURE multi_agent_system
343	END INTERFACE multi_agent_system
344
345	CONTAINS
346
347
348	!--------------------------------------------------------------------------------------------------!
349	! Description:
350	! ------------
351	!> Multi Agent System:
352	!> executes a number of agents sub-timesteps until the model timestep is reached.
353	!> The agent timestep is usually smaller than the model timestep.
354	!--------------------------------------------------------------------------------------------------!
355	SUBROUTINE multi_agent_system
356
357	USE biometeorology_mod, &
358	ONLY: bio_calc_ipt, &
359	bio_calculate_mrt_grid, &
360	bio_get_thermal_index_input_ij
361
362
363	IMPLICIT NONE
364
365	INTEGER(iwp) :: i !< counter
366	INTEGER(iwp) :: ie !< counter
367	INTEGER(iwp) :: is !< counter
368	INTEGER(iwp) :: j !< counter
369	INTEGER(iwp) :: je !< counter
370	INTEGER(iwp) :: js !< counter
371	INTEGER(iwp), SAVE :: mas_count = 0 !< counts the mas-calls
372	INTEGER(iwp) :: a !< agent iterator
373	!
374	!-- local meteorological conditions
375	REAL(wp) :: pair !< air pressure (hPa)
376	REAL(wp) :: ta !< air temperature (degree_C)
377	REAL(wp) :: tmrt !< mean radiant temperature (degree_C)
378	REAL(wp) :: v !< wind speed (local level) (m/s)
379	REAL(wp) :: vp !< vapour pressure (hPa)
380
381
382	LOGICAL :: first_loop_stride !< flag for first loop stride of agent sub-timesteps
383	LOGICAL, SAVE :: first_call = .TRUE. !< first call of mas flag for output
384
385
386	IF ( debug_output_timestep ) CALL debug_message( 'multi_agent_system', 'start' )
387
388	CALL cpu_log( log_point(9), 'mas', 'start' )
389	!
390	!-- Initialize variables for the next (sub-) timestep, i.e., for marking those agents to be deleted
391	!-- after the timestep
392	deleted_agents = 0
393	agent_substep_time = 0.0_wp
394	!
395	!-- If necessary, release new set of agents
396	IF ( time_arel >= dt_arel .AND. end_time_arel > time_since_reference_point ) THEN
397
398	CALL mas_create_agent( phase_release )
399	!
400	!-- The MOD function allows for changes in the output interval with restart runs.
401	time_arel = MOD( time_arel, MAX( dt_arel, dt_3d ) )
402
403	ENDIF
404
405	first_loop_stride = .TRUE.
406	grid_agents(:,:)%time_loop_done = .TRUE.
407	!
408	!-- Set timestep variable
409	IF ( .NOT. agent_own_timestep ) dt_agent = dt_3d
410	!
411	!-- Timestep loop for agent transport.
412	!-- This loop has to be repeated until the transport time of every agent (within the total domain!)
413	!-- has reached the LES timestep (dt_3d).
414	!-- Timestep scheme is Euler-forward.
415	DO
416	!
417	!-- Write agent data at current time on file.
418	time_write_agent_data = time_write_agent_data + dt_agent
419	agent_substep_time = agent_substep_time + dt_agent
420	IF ( time_write_agent_data >= dt_write_agent_data ) THEN
421	#if defined( __netcdf )
422	IF ( first_loop_stride ) CALL mas_get_prognostic_quantities
423	CALL mas_data_output_agents ( first_call )
424	#else
425	WRITE( message_string, * ) 'NetCDF is needed for agent output. ', &
426	'Set __netcdf in compiler options'
427	CALL message( 'multi_agent_system', 'PA0071', 1, 2, 0, 6, 0 )
428	#endif
429	IF(first_call) first_call = .FALSE.
430	time_write_agent_data = time_write_agent_data - dt_write_agent_data
431	ENDIF
432	!
433	!-- Flag is true by default, will be set to false if an agent has not yet reached the model
434	!-- timestep.
435	grid_agents(:,:)%time_loop_done = .TRUE.
436
437	!
438	!-- First part of agent transport:
439	!-- Evaluate social forces for all agents at current positions
440	CALL cpu_log( log_point_s(9), 'mas_social_forces', 'start' )
441	DO i = nxl, nxr
442	DO j = nys, nyn
443
444	number_of_agents = agt_count(j,i)
445	!
446	!-- If grid cell is empty, cycle
447	IF ( number_of_agents <= 0 ) CYCLE
448
449	agents => grid_agents(j,i)%agents(1:number_of_agents)
450	!
451	!-- Evaluation of social forces
452	CALL mas_timestep_forces_call(i,j)
453
454	ENDDO
455	ENDDO
456	CALL cpu_log( log_point_s(9), 'mas_social_forces', 'stop' )
457	!
458	!-- Second part of agent transport:
459	!-- timestep
460	CALL cpu_log( log_point_s(16), 'mas_timestep', 'start' )
461	DO i = nxl, nxr
462	DO j = nys, nyn
463
464	number_of_agents = agt_count(j,i)
465	!
466	!-- If grid cell is empty, flag must be true
467	IF ( number_of_agents <= 0 ) THEN
468	grid_agents(j,i)%time_loop_done = .TRUE.
469	CYCLE
470	ENDIF
471
472	agents => grid_agents(j,i)%agents(1:number_of_agents)
473
474	agents(1:number_of_agents)%agent_mask = .TRUE.
475	!
476	!-- Initialize the variable storing the total time that an agent has advanced within the
477	!-- timestep procedure.
478	IF ( first_loop_stride ) THEN
479	agents(1:number_of_agents)%dt_sum = 0.0_wp
480	ENDIF
481	!
482	!-- Initialize the switch used for the loop exit condition checked at the end of this loop.
483	!-- If at least one agent has failed to reach the LES timestep, this switch will be set
484	!-- false in mas_transport.
485	dt_3d_reached_l_mas = .TRUE.
486	!
487	!-- Timestep
488	CALL mas_timestep
489	!
490	!-- Delete agents that have been simulated longer than allowed.
491	CALL mas_boundary_conds( 'max_sim_time' )
492	!
493	!-- Delete agents that have reached target area.
494	CALL mas_boundary_conds( 'target_area' )
495	!
496	!-- If not all agents of the actual grid cell have reached the LES timestep, this cell has
497	!-- to do another loop iteration. Due to the fact that agents can move into neighboring
498	!-- grid cell, these neighbor cells also have to perform another loop iteration.
499	IF ( .NOT. dt_3d_reached_l_mas ) THEN
500	js = MAX(nys,j-1)
501	je = MIN(nyn,j+1)
502	is = MAX(nxl,i-1)
503	ie = MIN(nxr,i+1)
504	grid_agents(js:je,is:ie)%time_loop_done = .FALSE.
505	ENDIF
506
507	ENDDO
508	ENDDO
509	CALL cpu_log( log_point_s(16), 'mas_timestep', 'stop' )
510
511	!
512	!-- Find out, if all agents on each PE have completed the LES timestep and set the switch
513	!-- corespondingly.
514	dt_3d_reached_l_mas = ALL(grid_agents(:,:)%time_loop_done)
515	#if defined( __parallel )
516	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
517	CALL MPI_ALLREDUCE( dt_3d_reached_l_mas, dt_3d_reached_mas, 1, MPI_LOGICAL, MPI_LAND, &
518	comm2d, ierr )
519	#else
520	dt_3d_reached_mas = dt_3d_reached_l_mas
521	#endif
522
523	!
524	!-- Increment time since last release
525	IF ( dt_3d_reached_mas ) time_arel = time_arel + dt_3d
526
527	!
528	!-- Move Agents local to PE to a different grid cell
529	CALL cpu_log( log_point_s(18), 'mas_move_exch_sort', 'start' )
530	CALL mas_eh_move_agent
531	!
532	!-- Horizontal boundary conditions including exchange between subdmains
533	CALL mas_eh_exchange_horiz
534	!
535	!-- Pack agents (eliminate those marked for deletion), determine new number of agents
536	CALL mas_ps_sort_in_subboxes
537	CALL cpu_log( log_point_s(18), 'mas_move_exch_sort', 'stop' )
538	!
539	!-- Initialize variables for the next (sub-) timestep, i.e., for marking those agents to be
540	!-- deleted after the timestep
541	deleted_agents = 0
542
543	IF ( biometeorology ) THEN
544	!
545	!-- Fill out the MRT 2D grid from appropriate source (RTM, RRTMG,...)
546	CALL bio_calculate_mrt_grid ( .FALSE. )
547	!
548	!-- Call of human thermal comfort mod (and UV exposure)
549	DO i = nxl, nxr
550	DO j = nys, nyn
551
552	number_of_agents = agt_count(j,i)
553	!
554	!-- If grid cell gets empty, cycle
555	IF ( number_of_agents <= 0 ) CYCLE
556
557	agents => grid_agents(j,i)%agents(1:number_of_agents)
558	!
559	!-- Evaluation of social forces
560	! CALL bio_dynamic( i, j )
561	!
562	!-- Determine local meteorological conditions
563	CALL bio_get_thermal_index_input_ij ( .FALSE., i, j, ta, vp, v, pair, tmrt )
564
565	DO a = 1, number_of_agents
566	!
567	!-- Calculate instationary thermal indices based on local tmrt
568
569	CALL bio_calc_ipt ( ta, vp, v, pair, tmrt, &
570	agents(a)%dt_sum, &
571	agents(a)%energy_storage, &
572	agents(a)%clothing_temp, &
573	agents(a)%clo, &
574	agents(a)%actlev, &
575	agents(a)%age_years, &
576	agents(a)%weight, &
577	agents(a)%height, &
578	agents(a)%work, &
579	agents(a)%sex, &
580	agents(a)%ipt )
581	END DO
582
583	ENDDO
584	ENDDO
585	ENDIF
586
587	IF ( dt_3d_reached_mas ) EXIT
588
589	first_loop_stride = .FALSE.
590	ENDDO ! timestep loop
591
592	!
593	!-- Deallocate unused memory
594	IF ( deallocate_memory_mas .AND. mas_count == step_dealloc_mas ) THEN
595	CALL mas_eh_dealloc_agents_array
596	mas_count = 0
597	ELSEIF ( deallocate_memory_mas ) THEN
598	mas_count = mas_count + 1
599	ENDIF
600
601	CALL cpu_log( log_point(9), 'mas', 'stop' )
602
603	IF ( debug_output_timestep ) CALL debug_message( 'multi_agent_system', 'end' )
604
605
606	END SUBROUTINE multi_agent_system
607
608	!--------------------------------------------------------------------------------------------------!
609	! Description:
610	! ------------
611	!> Calculation of the direction vector from each agent to its current intermittent target.
612	!--------------------------------------------------------------------------------------------------!
613	SUBROUTINE mas_agent_direction
614
615	IMPLICIT NONE
616
617	LOGICAL :: path_flag !< true if new path must be calculated
618
619	INTEGER(iwp) :: n !< loop variable over all agents in a grid box
620	INTEGER(iwp) :: pc !< agent path counter
621
622	REAL(wp) :: abs_dir !< length of direction vector (for normalization)
623	! REAL(wp) :: d_curr_target !< rounding influence expressed as x speed component
624	! REAL(wp) :: d_prev_target !< rounding influence expressed as x speed component
625	REAL(wp) :: dir_x !< direction of agent (x)
626	REAL(wp) :: dir_y !< direction of agent (y)
627	! REAL(wp) :: dist_round = 3. !< distance at which agents start rounding a corner
628	REAL(wp) :: dtit !< distance to intermittent target
629	! REAL(wp) :: round_fac = 0.2 !< factor for rounding influence
630	! REAL(wp) :: speed_round_x !< rounding influence expressed as x speed component
631	! REAL(wp) :: speed_round_y !< rounding influence expressed as x speed component
632
633	!
634	!-- Loop over all agents in the current grid box
635	DO n = 1, number_of_agents
636	path_flag = .FALSE.
637	pc = agents(n)%path_counter
638	!
639	!-- If no path was calculated for agent yet, do it.
640	IF ( pc >= 999 ) THEN
641	CALL mas_nav_find_path(n)
642	pc = agents(n)%path_counter
643	!
644	!-- Check if new path must be calculated and if so, do it.
645	ELSE
646	!
647	!-- Case one: Agent has come close enough to intermittent target.
648	!-- -> chose new int target and calculate rest of path if no
649	!-- new intermittent targets are left
650	dtit = SQRT( ( agents(n)%x - agents(n)%path_x(pc) )**2 &
651	+ ( agents(n)%y - agents(n)%path_y(pc) )**2 )
652	IF ( dtit < dist_to_int_target ) THEN
653	agents(n)%path_counter = agents(n)%path_counter + 1
654	pc = agents(n)%path_counter
655	!
656	!-- Path counter out of scope (each agent can store a maximum of 15 intermittent targets on
657	!-- the way to its final target); new path must be calculated.
658	IF ( pc >= SIZE( agents(n)%path_x) ) THEN
659	path_flag = .TRUE.
660	ENDIF
661	!
662	!-- Case two: Agent too far from path
663	!-- -> set flag for new path to be calculated
664	ELSEIF ( dist_point_to_edge(agents(n)%path_x(pc-1), &
665	agents(n)%path_y(pc-1), &
666	agents(n)%path_x(pc), &
667	agents(n)%path_y(pc), &
668	agents(n)%x, agents(n)%y) &
669	> max_dist_from_path ) &
670	THEN
671	path_flag = .TRUE.
672	ENDIF
673	!
674	!-- If one of the above two cases was true, calculate new path and reset 0th path point.
675	!-- This point (the last target the agent had) is needed for the agent's rounding of corners
676	!-- and the calculation of its deviation from its current path.
677	IF ( path_flag ) THEN
678	CALL mas_nav_find_path(n)
679	pc = agents(n)%path_counter
680	ENDIF
681	ENDIF
682	!
683	!-- Normalize direction vector
684	abs_dir = 1.0d-12
685	dir_x = agents(n)%path_x(pc) - agents(n)%x
686	dir_y = agents(n)%path_y(pc) - agents(n)%y
687	abs_dir = SQRT( dir_x2 + dir_y2 )+1.0d-12
688	!-- needed later for corner rounding
689	! dir_x = dir_x/abs_dir
690	! dir_y = dir_y/abs_dir
691	! dir_x = dir_x + speed_round_x
692	! dir_y = dir_y + speed_round_y
693	! abs_dir = SQRT(dir_x2 + dir_y2)+1.0d-12
694	agents(n)%speed_e_x = dir_x/abs_dir
695	agents(n)%speed_e_y = dir_y/abs_dir
696	ENDDO
697
698	!
699	!-- corner rounding; to be added
700	!
701	!-- Calculate direction change due to rounding of corners
702
703	! speed_round_x = 0.
704	! speed_round_y = 0.
705	!
706	! d_curr_target = SQRT( (agents(n)%path_x(pc) - agents(n)%x)**2 + &
707	! (agents(n)%path_y(pc) - agents(n)%y)**2 )
708	! d_prev_target = SQRT( (agents(n)%path_x(pc-1) - agents(n)%x)**2 + &
709	! (agents(n)%path_y(pc-1) - agents(n)%y)**2 )
710	! !
711	! !-- Agent is close to next target and that target is not the final one
712	! IF ( d_curr_target < dist_round .AND. dist_round < &
713	! SQRT( (agents(n)%path_x(pc) - agents(n)%t_x)**2 + &
714	! (agents(n)%path_y(pc) - agents(n)%t_y)**2 ) ) &
715	! THEN
716	! speed_round_x = (agents(n)%path_x(pc+1) - agents(n)%path_x(pc)) / &
717	! ABS( agents(n)%path_x(pc) &
718	! - agents(n)%path_x(pc+1)) * round_fac * &
719	! SIN( pi/dist_round*d_curr_target )
720	! speed_round_y = (agents(n)%path_y(pc+1) - agents(n)%path_y(pc)) / &
721	! ABS( agents(n)%path_y(pc) &
722	! - agents(n)%path_y(pc+1)) * round_fac * &
723	! SIN( pi/dist_round*d_curr_target )
724	! ENDIF
725	!
726	! IF ( d_prev_target < dist_round ) THEN
727	! IF ( agents(n)%path_x(pc) /= agents(n)%path_x(pc+1) ) THEN
728	! speed_round_x = speed_round_x + &
729	! (agents(n)%path_x(pc) - agents(n)%path_x(pc+1)) / &
730	! ABS( agents(n)%path_x(pc) &
731	! - agents(n)%path_x(pc+1)) * round_fac * &
732	! SIN( pi/dist_round*d_prev_target )
733	! ENDIF
734	!
735	! IF ( agents(n)%path_y(pc) /= agents(n)%path_y(pc+1) ) THEN
736	! speed_round_y = speed_round_y + &
737	! (agents(n)%path_y(pc) - agents(n)%path_y(pc+1)) / &
738	! ABS( agents(n)%path_y(pc) &
739	! - agents(n)%path_y(pc+1)) * round_fac * &
740	! SIN( pi/dist_round*d_prev_target )
741	! ENDIF
742
743	! ENDIF
744
745
746	END SUBROUTINE mas_agent_direction
747
748	!--------------------------------------------------------------------------------------------------!
749	! Description:
750	! ------------
751	!> Boundary conditions for maximum time, target reached and out of domain
752	!--------------------------------------------------------------------------------------------------!
753	SUBROUTINE mas_boundary_conds( location )
754
755	IMPLICIT NONE
756
757	CHARACTER (LEN=*) :: location !< Identifier
758
759	INTEGER(iwp) :: grp !< agent group
760	INTEGER(iwp) :: n !< agent number
761
762	REAL(wp) :: dist_to_target !< distance to target
763
764	IF ( location == 'max_sim_time' ) THEN
765
766	!
767	!-- Delete agents that have been simulated longer than allowed
768	DO n = 1, number_of_agents
769
770	IF ( agents(n)%age > agent_maximum_age .AND. agents(n)%agent_mask ) THEN
771	agents(n)%agent_mask = .FALSE.
772	deleted_agents = deleted_agents + 1
773	ENDIF
774
775	ENDDO
776	ENDIF
777
778	IF ( location == 'target_area' ) THEN
779
780	!
781	!-- Delete agents that entered target region
782	DO n = 1, number_of_agents
783	grp = agents(n)%group
784	dist_to_target = SQRT( ( agents(n)%x - at_x(grp) )2 + ( agents(n)%y - at_y(grp) )2 )
785	IF ( dist_to_target < dist_target_reached ) THEN
786	agents(n)%agent_mask = .FALSE.
787	deleted_agents = deleted_agents + 1
788	ENDIF
789
790	ENDDO
791	ENDIF
792
793	END SUBROUTINE mas_boundary_conds
794
795	!--------------------------------------------------------------------------------------------------!
796	! Description:
797	! ------------
798	!> Release new agents at their respective sources
799	!--------------------------------------------------------------------------------------------------!
800	SUBROUTINE mas_create_agent ( phase )
801
802	IMPLICIT NONE
803
804	INTEGER(iwp) :: alloc_size !< relative increase of allocated memory for agents
805	INTEGER(iwp) :: i !< loop variable ( agent groups )
806	INTEGER(iwp) :: ip !< index variable along x
807	INTEGER(iwp) :: jp !< index variable along y
808	INTEGER(iwp) :: loop_stride !< loop variable for initialization
809	INTEGER(iwp) :: n !< loop variable ( number of agents )
810	INTEGER(iwp) :: new_size !< new size of allocated memory for agents
811	INTEGER(iwp) :: rn_side !< index of agent path
812
813	INTEGER(iwp), INTENT(IN) :: phase !< mode of inititialization
814
815	INTEGER(iwp), DIMENSION(nysg:nyng,nxlg:nxrg) :: local_count !< start address of new agent
816	INTEGER(iwp), DIMENSION(nysg:nyng,nxlg:nxrg) :: local_start !< start address of new agent
817
818	LOGICAL :: first_stride !< flag for initialization
819
820	REAL(wp) :: pos_x !< increment for agent position in x
821	REAL(wp) :: pos_y !< increment for agent position in y
822	REAL(wp) :: rand_contr !< dummy argument for random position
823	REAL(wp) :: rn_side_dum !< index of agent path
824
825	TYPE(agent_type),TARGET :: tmp_agent !< temporary agent used for initialization
826
827	!
828	!-- Calculate agent positions and store agent attributes, if agent is situated on this PE.
829	DO loop_stride = 1, 2
830	first_stride = (loop_stride == 1)
831	IF ( first_stride ) THEN
832	local_count = 0 ! count number of agents
833	ELSE
834	local_count = agt_count ! Start address of new agents
835	ENDIF
836
837	DO i = 1, number_of_agent_groups
838
839	pos_y = ass(i)
840
841	DO WHILE ( pos_y <= asn(i) )
842
843	IF ( pos_y >= nys * dy .AND. pos_y < ( nyn + 1 ) * dy ) THEN
844
845	pos_x = asl(i)
846
847	xloop: DO WHILE ( pos_x <= asr(i) )
848
849	IF ( pos_x >= nxl * dx .AND. pos_x < ( nxr + 1) * dx ) THEN
850
851	tmp_agent%agent_mask = .TRUE.
852	tmp_agent%group = i
853	tmp_agent%id = 0_idp
854	tmp_agent%block_nr = -1
855	tmp_agent%path_counter = 999 !SIZE(tmp_agent%path_x)
856	tmp_agent%age = 0.0_wp
857	tmp_agent%age_m = 0.0_wp
858	tmp_agent%dt_sum = 0.0_wp
859	tmp_agent%clo = -999.0_wp
860	tmp_agent%energy_storage= 0.0_wp
861	tmp_agent%ipt = 99999.0_wp
862	tmp_agent%clothing_temp = -999._wp !< energy stored by agent (W)
863	tmp_agent%actlev = 134.6862_wp !< metabolic + work energy of the person
864	tmp_agent%age_years = 35._wp !< physical age of the person
865	tmp_agent%weight = 75._wp !< total weight of the person (kg)
866	tmp_agent%height = 1.75_wp !< height of the person (m)
867	tmp_agent%work = 134.6862_wp !< workload of the agent (W)
868	tmp_agent%sex = 1 !< agents gender: 1 = male, 2 = female
869	tmp_agent%force_x = 0.0_wp
870	tmp_agent%force_y = 0.0_wp
871	tmp_agent%origin_x = pos_x
872	tmp_agent%origin_y = pos_y
873	tmp_agent%speed_abs = 0.0_wp
874	tmp_agent%speed_e_x = 0.0_wp
875	tmp_agent%speed_e_y = 0.0_wp
876	tmp_agent%speed_des = random_normal(desired_speed,des_sp_sig)
877	tmp_agent%speed_x = 0.0_wp
878	tmp_agent%speed_y = 0.0_wp
879	tmp_agent%x = pos_x
880	tmp_agent%y = pos_y
881	tmp_agent%path_x = -1.0_wp
882	tmp_agent%path_y = -1.0_wp
883	tmp_agent%t_x = - pi
884	tmp_agent%t_y = - pi
885	!
886	!-- Determine the grid indices of the agent position
887	ip = tmp_agent%x * ddx
888	jp = tmp_agent%y * ddy
889	!
890	!-- Give each agent its target
891	IF ( a_rand_target(i) ) THEN
892	!
893	!-- Agent shall receive random target just outside simulated area
894	rn_side_dum = random_function(iran_agent)
895	rn_side = FLOOR( 4.*rn_side_dum )
896	IF ( rn_side < 2 ) THEN
897	IF ( rn_side == 0 ) THEN
898	tmp_agent%t_y = -2 * dy
899	ELSE
900	tmp_agent%t_y = ( ny + 3 ) * dy
901	ENDIF
902	tmp_agent%t_x = random_function(iran_agent) * ( nx + 1 ) * dx
903	ELSE
904	IF ( rn_side == 2 ) THEN
905	tmp_agent%t_x = -2 * dx
906	ELSE
907	tmp_agent%t_x = ( nx + 3 ) * dx
908	ENDIF
909	tmp_agent%t_y = random_function(iran_agent) * ( ny + 1 ) * dy
910	ENDIF
911	!
912	!-- Agent gets target of her group
913	ELSE
914	tmp_agent%t_x = at_x(i)
915	tmp_agent%t_y = at_y(i)
916	ENDIF
917
918	local_count(jp,ip) = local_count(jp,ip) + 1
919
920	IF ( .NOT. first_stride ) THEN
921	grid_agents(jp,ip)%agents(local_count(jp,ip)) = tmp_agent
922	ENDIF
923
924	ENDIF
925
926	pos_x = pos_x + adx(i)
927
928	ENDDO xloop
929
930	ENDIF
931
932	pos_y = pos_y + ady(i)
933
934	ENDDO
935
936	ENDDO
937
938	!
939	!-- Allocate or reallocate agents array to new size
940	IF ( first_stride ) THEN
941	DO ip = nxlg, nxrg
942	DO jp = nysg, nyng
943	IF ( phase == phase_init ) THEN
944	IF ( local_count(jp,ip) > 0 ) THEN
945	alloc_size = MAX( INT( local_count(jp,ip) * &
946	( 1.0_wp + alloc_factor_mas / 100.0_wp ) ), &
947	min_nr_agent )
948	ELSE
949	alloc_size = min_nr_agent
950	ENDIF
951	ALLOCATE( grid_agents(jp,ip)%agents(1:alloc_size) )
952	DO n = 1, alloc_size
953	grid_agents(jp,ip)%agents(n) = zero_agent
954	ENDDO
955	ELSEIF ( phase == phase_release ) THEN
956	IF ( local_count(jp,ip) > 0 ) THEN
957	new_size = local_count(jp,ip) + agt_count(jp,ip)
958	alloc_size = MAX( INT( new_size * &
959	( 1.0_wp + alloc_factor_mas / 100.0_wp ) ), &
960	min_nr_agent )
961	IF( alloc_size > SIZE( grid_agents(jp,ip)%agents) ) THEN
962	CALL mas_eh_realloc_agents_array(ip,jp,alloc_size)
963	ENDIF
964	ENDIF
965	ENDIF
966	ENDDO
967	ENDDO
968	ENDIF
969
970	ENDDO
971
972	local_start = agt_count+1
973	agt_count = local_count
974
975	!
976	!-- Calculate agent IDs
977	DO ip = nxl, nxr
978	DO jp = nys, nyn
979	number_of_agents = agt_count(jp,ip)
980	IF ( number_of_agents <= 0 ) CYCLE
981	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
982
983	DO n = local_start(jp,ip), number_of_agents !only new agents
984
985	agents(n)%id = 10000_idp*2 grid_agents(jp,ip)%id_counter + 10000_idp * jp + ip
986	!
987	!-- Count the number of agents that have been released before
988	grid_agents(jp,ip)%id_counter = grid_agents(jp,ip)%id_counter + 1
989
990	ENDDO
991
992	ENDDO
993	ENDDO
994
995	!
996	!-- Add random fluctuation to agent positions.
997	IF ( random_start_position_agents ) THEN
998	DO ip = nxl, nxr
999	DO jp = nys, nyn
1000	number_of_agents = agt_count(jp,ip)
1001	IF ( number_of_agents <= 0 ) CYCLE
1002	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1003	!
1004	!-- Move only new agents. Moreover, limit random fluctuation in order to prevent that
1005	!-- agents move more than one grid box, which would lead to problems concerning agent
1006	!-- exchange between processors in case adx/ady are larger than dx/dy, respectively.
1007	DO n = local_start(jp,ip), number_of_agents
1008	IF ( asl(agents(n)%group) /= asr(agents(n)%group) ) THEN
1009	rand_contr = ( random_function( iran_agent ) - 0.5_wp ) * adx(agents(n)%group)
1010	agents(n)%x = agents(n)%x + MERGE( rand_contr, SIGN( dx, rand_contr ), &
1011	ABS( rand_contr ) < dx &
1012	)
1013	ENDIF
1014	IF ( ass(agents(n)%group) /= asn(agents(n)%group) ) THEN
1015	rand_contr = ( random_function( iran_agent ) - 0.5_wp ) * ady(agents(n)%group)
1016	agents(n)%y = agents(n)%y + &
1017	MERGE( rand_contr, SIGN( dy, rand_contr ), ABS( rand_contr ) < dy )
1018	ENDIF
1019	ENDDO
1020	!
1021	!-- Delete agents that have been simulated longer than allowed
1022	CALL mas_boundary_conds( 'max_sim_time' )
1023	!
1024	!-- Delete agents that have reached target area
1025	CALL mas_boundary_conds( 'target_area' )
1026
1027	ENDDO
1028	ENDDO
1029	!
1030	!-- Exchange agents between grid cells and processors
1031	CALL mas_eh_move_agent
1032	CALL mas_eh_exchange_horiz
1033
1034	ENDIF
1035	!
1036	!-- In case of random_start_position_agents, delete agents identified by mas_eh_exchange_horiz and
1037	!-- mas_boundary_conds. Then sort agents into blocks, which is needed for a fast interpolation of
1038	!-- the LES fields on the agent position.
1039	CALL mas_ps_sort_in_subboxes
1040
1041	!
1042	!-- Determine the current number of agents
1043	number_of_agents = 0
1044	DO ip = nxl, nxr
1045	DO jp = nys, nyn
1046	number_of_agents = number_of_agents + agt_count(jp,ip)
1047	ENDDO
1048	ENDDO
1049	!
1050	!-- Calculate the number of agents of the total domain
1051	#if defined( __parallel )
1052	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1053	CALL MPI_ALLREDUCE( number_of_agents, total_number_of_agents, 1, MPI_INTEGER, MPI_SUM, comm2d, &
1054	ierr )
1055	#else
1056	total_number_of_agents = number_of_agents
1057	#endif
1058
1059	RETURN
1060
1061	END SUBROUTINE mas_create_agent
1062
1063	!--------------------------------------------------------------------------------------------------!
1064	! Description:
1065	! ------------
1066	!> Creates flags that indicate if a gridbox contains edges or corners. These flags are used for
1067	!> agents to check if obstacles are close to them.
1068	!--------------------------------------------------------------------------------------------------!
1069	SUBROUTINE mas_create_obstacle_flags
1070
1071	USE arrays_3d, &
1072	ONLY: zw
1073
1074	IMPLICIT NONE
1075
1076	INTEGER(iwp) :: il
1077	INTEGER(iwp) :: jl
1078
1079	ALLOCATE( obstacle_flags(nysg:nyng,nxlg:nxrg) )
1080
1081	obstacle_flags = 0
1082
1083	DO il = nxlg, nxrg
1084	DO jl = nysg, nyng
1085	!
1086	!-- Exclude cyclic topography boundary
1087	IF ( il < 0 .OR. il > nx .OR. jl < 0 .OR. jl > ny ) CYCLE
1088	!
1089	!-- North edge
1090	IF ( jl < nyng ) THEN
1091	IF ( ( top_top_s(jl,il) - top_top_s(jl+1,il) ) > 1 .AND. &
1092	( zw( top_top_w(jl,il) ) - zw( top_top_w(jl+1,il) ) ) > 0.51_wp ) &
1093	THEN
1094	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 0 )
1095	ENDIF
1096	ENDIF
1097	!
1098	!-- North right corner
1099	IF ( jl < nyng .AND. il < nxrg ) THEN
1100	IF ( ( top_top_s(jl,il) - top_top_s(jl+1,il) ) > 1 .AND. &
1101	( top_top_s(jl,il) - top_top_s(jl+1,il+1) ) > 1 .AND. &
1102	( top_top_s(jl,il) - top_top_s(jl,il+1) ) > 1 .AND. &
1103	( zw( top_top_w(jl,il) ) - zw( top_top_w(jl+1,il+1) ) ) > 0.51_wp ) &
1104	THEN
1105	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 1 )
1106	ENDIF
1107	ENDIF
1108	!
1109	!-- Right edge
1110	IF ( il < nxrg ) THEN
1111	IF ( ( top_top_s(jl,il) - top_top_s(jl,il+1) ) > 1 .AND. &
1112	( zw( top_top_w(jl,il) ) - zw( top_top_w(jl,il+1) ) ) > 0.51_wp ) &
1113	THEN
1114	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 2 )
1115	ENDIF
1116	ENDIF
1117	!
1118	!-- South right corner
1119	IF ( jl > nysg .AND. il < nxrg ) THEN
1120	IF ( ( top_top_s(jl,il) - top_top_s(jl,il+1) ) > 1 .AND. &
1121	( top_top_s(jl,il) - top_top_s(jl-1,il+1) ) > 1 .AND. &
1122	( top_top_s(jl,il) - top_top_s(jl-1,il) ) > 1 .AND. &
1123	( zw(top_top_w(jl,il) ) - zw( top_top_w(jl-1,il+1) ) ) > 0.51_wp ) &
1124	THEN
1125	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 3 )
1126	ENDIF
1127	ENDIF
1128	!
1129	!-- South edge
1130	IF ( jl > nysg ) THEN
1131	IF ( ( top_top_s(jl,il) - top_top_s(jl-1,il) ) > 1 .AND. &
1132	( zw( top_top_w(jl,il) ) - zw( top_top_w(jl-1,il) ) ) > 0.51_wp ) &
1133	THEN
1134	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 4 )
1135	ENDIF
1136	ENDIF
1137	!
1138	!-- South left corner
1139	IF ( jl > nysg .AND. il > nxlg ) THEN
1140	IF ( ( top_top_s(jl,il) - top_top_s(jl-1,il) ) > 1 .AND. &
1141	( top_top_s(jl,il) - top_top_s(jl-1,il-1) ) > 1 .AND. &
1142	( top_top_s(jl,il) - top_top_s(jl,il-1) ) > 1 .AND. &
1143	( zw( top_top_w(jl,il) ) - zw(top_top_w(jl-1,il-1) ) ) > 0.51_wp ) &
1144	THEN
1145	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 5 )
1146	ENDIF
1147	ENDIF
1148	!
1149	!-- Left edge
1150	IF ( il > nxlg ) THEN
1151	IF ( ( top_top_s(jl,il) - top_top_s(jl,il-1) ) > 1 .AND. &
1152	( zw(top_top_w(jl,il) ) - zw(top_top_w(jl,il-1) ) ) > 0.51_wp ) &
1153	THEN
1154	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 6 )
1155	ENDIF
1156	ENDIF
1157	!
1158	!-- North left corner
1159	IF ( jl < nyng .AND. il > nxlg ) THEN
1160	IF ( ( top_top_s(jl,il) - top_top_s(jl,il-1) ) > 1 .AND. &
1161	( top_top_s(jl,il) - top_top_s(jl+1,il-1) ) > 1 .AND. &
1162	( top_top_s(jl,il) - top_top_s(jl+1,il) ) > 1 .AND. &
1163	( zw( top_top_w(jl,il) ) - zw( top_top_w(jl+1,il-1) ) ) > 0.51_wp ) &
1164	THEN
1165	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 7 )
1166	ENDIF
1167	ENDIF
1168
1169	ENDDO
1170	ENDDO
1171
1172	END SUBROUTINE mas_create_obstacle_flags
1173
1174	!--------------------------------------------------------------------------------------------------!
1175	! Description:
1176	! ------------
1177	!> Write agent data in netCDF format
1178	!--------------------------------------------------------------------------------------------------!
1179	SUBROUTINE mas_data_output_agents( ftest )
1180
1181	USE control_parameters, &
1182	ONLY: agt_time_count, biometeorology, end_time, message_string, multi_agent_system_end, &
1183	multi_agent_system_start
1184
1185	USE netcdf_interface, &
1186	ONLY: nc_stat, id_set_agt, id_var_time_agt, id_var_agt, netcdf_handle_error
1187
1188	USE pegrid
1189
1190	#if defined( __netcdf )
1191	USE NETCDF
1192	#endif
1193	USE mas_global_attributes, &
1194	ONLY: dim_size_agtnum
1195
1196	IMPLICIT NONE
1197
1198	#if defined( __parallel )
1199	INTEGER(iwp) :: agt_size !< Agent size in bytes
1200	INTEGER(iwp) :: n !< counter (number of PEs)
1201	INTEGER(iwp) :: noa_rcv !< received number of agents
1202	#endif
1203	INTEGER(iwp) :: dummy !< dummy
1204	INTEGER(iwp) :: ii !< counter (x)
1205	INTEGER(iwp) :: ip !< counter (x)
1206	INTEGER(iwp) :: jp !< counter (y)
1207	INTEGER(iwp) :: noa !< number of agents
1208	INTEGER(iwp) :: out_noa !< number of agents for output
1209
1210	#if defined( __parallel )
1211	INTEGER(iwp), DIMENSION(0:numprocs-1) :: noa_arr !< number of agents on each PE
1212	#endif
1213	!
1214	!-- SAVE attribute required to avoid compiler warning about pointer outlive the pointer target
1215	TYPE(agent_type), DIMENSION(:), ALLOCATABLE, TARGET, SAVE :: trf_agents !< all agents on current PE
1216	#if defined( __parallel )
1217	TYPE(agent_type), DIMENSION(:), ALLOCATABLE, TARGET, SAVE :: out_agents !< all agents in entire domain
1218	#endif
1219
1220	LOGICAL, INTENT (INOUT) :: ftest
1221
1222	LOGICAL, SAVE :: agt_dimension_exceeded = .FALSE.
1223
1224
1225	CALL cpu_log( log_point_s(17), 'mas_data_output', 'start' )
1226	!
1227	!-- Get total number of agents and put all agents on one PE in one array
1228	noa = 0
1229	DO ip = nxl, nxr
1230	DO jp = nys, nyn
1231	noa = noa + agt_count(jp,ip)
1232	ENDDO
1233	ENDDO
1234	IF ( noa > 0 ) THEN
1235	ALLOCATE( trf_agents(1:noa) )
1236	dummy = 1
1237	DO ip = nxl, nxr
1238	DO jp = nys, nyn
1239	IF ( agt_count(jp,ip) == 0 ) CYCLE
1240	agents => grid_agents(jp,ip)%agents(1:agt_count(jp,ip))
1241	trf_agents(dummy:(dummy-1+agt_count(jp,ip))) = agents
1242	dummy = dummy + agt_count(jp,ip)
1243	ENDDO
1244	ENDDO
1245	ENDIF
1246	#if defined( __parallel )
1247	!
1248	!-- Gather all agents on PE0 for output
1249	IF ( myid == 0 ) THEN
1250	noa_arr(0) = noa
1251	!
1252	!-- Receive data from all other PEs.
1253	DO n = 1, numprocs-1
1254	CALL MPI_RECV( noa_arr(n), 1, MPI_INTEGER, n, 0, comm2d, status, ierr )
1255	ENDDO
1256	ELSE
1257	CALL MPI_SEND( noa, 1, MPI_INTEGER, 0, 0, comm2d, ierr )
1258	ENDIF
1259	CALL MPI_BARRIER( comm2d, ierr )
1260	agt_size = STORAGE_SIZE( zero_agent ) / 8
1261	IF ( myid == 0 ) THEN
1262	!
1263	!-- Receive data from all other PEs.
1264	out_noa = SUM( noa_arr )
1265	IF ( out_noa > 0 ) THEN
1266	ALLOCATE( out_agents(1:out_noa) )
1267	IF ( noa > 0 ) THEN
1268	out_agents(1:noa) = trf_agents
1269	ENDIF
1270	noa_rcv = noa
1271	DO n = 1, numprocs-1
1272	IF ( noa_arr(n) > 0 ) THEN
1273	CALL MPI_RECV( out_agents(noa_rcv+1), noa_arr(n) * agt_size, MPI_BYTE, n, 0, &
1274	comm2d, status, ierr )
1275	noa_rcv = noa_rcv + noa_arr(n)
1276	ENDIF
1277	ENDDO
1278	ELSE
1279	ALLOCATE( out_agents(1:2) )
1280	out_agents = zero_agent
1281	out_noa = 2
1282	ENDIF
1283	ELSE
1284	IF ( noa > 0 ) THEN
1285	CALL MPI_SEND( trf_agents(1), noa*agt_size, MPI_BYTE, 0, 0, comm2d, ierr )
1286	ENDIF
1287	ENDIF
1288	!
1289	!-- A barrier has to be set, because otherwise some PEs may proceed too fast so that PE0 may receive
1290	!-- wrong data on tag 0.
1291	CALL MPI_BARRIER( comm2d, ierr )
1292	#endif
1293	IF ( myid == 0 ) THEN
1294	#if defined( __parallel )
1295	agents => out_agents
1296	#else
1297	agents => trf_agents
1298	#endif
1299
1300	#if defined( __netcdf )
1301	!
1302	!-- Update maximum number of agents
1303	maximum_number_of_agents = MAX(maximum_number_of_agents, out_noa)
1304	!
1305	!-- Output in netCDF format
1306	IF ( ftest ) THEN
1307	!
1308	!-- First, define size of agent number dimension from amount of agents released, release
1309	!-- interval, time of agent simulation and max age of agents.
1310	dim_size_agtnum = MIN( MIN( multi_agent_system_end, end_time ) &
1311	- multi_agent_system_start, &
1312	agent_maximum_age)
1313
1314	DO ii = 1, number_of_agent_groups
1315	dim_size_agtnum = dim_size_agtnum &
1316	+ ( FLOOR( ( asr(ii)-asl(ii) ) / adx(ii) ) + 1 ) &
1317	* ( FLOOR( ( asn(ii)-ass(ii) ) / ady(ii) ) + 1 ) &
1318	* ( FLOOR( dim_size_agtnum / dt_arel ) + 1 ) &
1319	* dim_size_factor_agtnum
1320	dim_size_agtnum = MIN( dim_size_agtnum, dim_size_agtnum_manual )
1321	ENDDO
1322	CALL check_open( 118 )
1323	ENDIF
1324
1325	!
1326	!-- Update the NetCDF time axis
1327	agt_time_count = agt_time_count + 1
1328
1329	IF ( .NOT. agt_dimension_exceeded ) THEN
1330	!
1331	!-- If number of agents to be output exceeds dimension, set flag and print warning.
1332	IF ( out_noa > dim_size_agtnum ) THEN
1333
1334	agt_dimension_exceeded = .TRUE.
1335	WRITE( message_string, '(A,F11.1,2(A,I8))' ) &
1336	'Number of agents exceeds agent dimension.' // &
1337	'&Starting at time_since_reference_point = ', &
1338	time_since_reference_point, &
1339	' s, &data may be missing.'// &
1340	'&Number of agents: ', out_noa, &
1341	'&Agent dimension size: ', dim_size_agtnum
1342
1343	CALL message( 'mas_data_output_agents', 'PA0420', 0, 1, 0, 6, 0 )
1344
1345	ENDIF
1346	ENDIF
1347
1348	!
1349	!-- Reduce number of output agents to dimension size, if necessary.
1350	IF ( agt_dimension_exceeded ) THEN
1351
1352	out_noa = MIN( out_noa, dim_size_agtnum )
1353
1354	ENDIF
1355
1356	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_time_agt, &
1357	(/ time_since_reference_point + agent_substep_time /), &
1358	start = (/ agt_time_count /), &
1359	count = (/ 1 /) )
1360	CALL netcdf_handle_error( 'mas_data_output_agents', 1 )
1361
1362	!
1363	!-- Output agent attributes
1364
1365	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(1), agents%id, &
1366	start = (/ 1, agt_time_count /), &
1367	count = (/ out_noa /) )
1368	CALL netcdf_handle_error( 'mas_data_output_agents', 2 )
1369
1370	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(2), agents%x, &
1371	start = (/ 1, agt_time_count /), &
1372	count = (/ out_noa /) )
1373	CALL netcdf_handle_error( 'mas_data_output_agents', 3 )
1374
1375	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(3), agents%y, &
1376	start = (/ 1, agt_time_count /), &
1377	count = (/ out_noa /) )
1378	CALL netcdf_handle_error( 'mas_data_output_agents', 4 )
1379
1380	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(4), agents%windspeed, &
1381	start = (/ 1, agt_time_count /), &
1382	count = (/ out_noa /) )
1383	CALL netcdf_handle_error( 'mas_data_output_agents', 5 )
1384
1385	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(5), agents%t, &
1386	start = (/ 1, agt_time_count /), &
1387	count = (/ out_noa /) )
1388	CALL netcdf_handle_error( 'mas_data_output_agents', 6 )
1389
1390	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(6), agents%group, &
1391	start = (/ 1, agt_time_count /), &
1392	count = (/ out_noa /) )
1393	CALL netcdf_handle_error( 'mas_data_output_agents', 7 )
1394
1395
1396	IF ( biometeorology ) THEN
1397	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(7), agents%ipt, &
1398	start = (/ 1, agt_time_count /), &
1399	count = (/ out_noa /) )
1400	CALL netcdf_handle_error( 'mas_data_output_agents', 8 )
1401	ENDIF
1402
1403
1404
1405	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(8), agents%pm10, &
1406	! start = (/ 1, agt_time_count /), &
1407	! count = (/ out_noa /) )
1408	! CALL netcdf_handle_error( 'mas_data_output_agents', 9 )
1409	!
1410	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(9), agents%pm25, &
1411	! start = (/ 1, agt_time_count /), &
1412	! count = (/ out_noa /) )
1413	! CALL netcdf_handle_error( 'mas_data_output_agents', 10 )
1414	!
1415	!
1416	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(9), agents%uv, &
1417	! start = (/ 1, agt_time_count /), &
1418	! count = (/ out_noa /) )
1419	! CALL netcdf_handle_error( 'mas_data_output_agents', 10 )
1420
1421	CALL cpu_log( log_point_s(17), 'mas_data_output', 'stop' )
1422
1423
1424	#endif
1425
1426	#if defined( __parallel )
1427	IF ( ALLOCATED( out_agents ) ) DEALLOCATE( out_agents )
1428	#endif
1429	ELSE
1430	CALL cpu_log( log_point_s(17), 'mas_data_output', 'stop' )
1431	ENDIF
1432
1433	IF ( ALLOCATED( trf_agents ) ) DEALLOCATE( trf_agents )
1434
1435	END SUBROUTINE mas_data_output_agents
1436
1437	#if defined( __parallel )
1438	!--------------------------------------------------------------------------------------------------!
1439	! Description:
1440	! ------------
1441	!> If an agent moves from one processor to another, this subroutine moves the corresponding elements
1442	!> from the agent arrays of the old grid cells to the agent arrays of the new grid cells.
1443	!--------------------------------------------------------------------------------------------------!
1444	SUBROUTINE mas_eh_add_agents_to_gridcell (agent_array)
1445
1446	IMPLICIT NONE
1447
1448	INTEGER(iwp) :: aindex !< dummy argument for new number of agents per grid box
1449	INTEGER(iwp) :: ip !< grid index (x) of agent
1450	INTEGER(iwp) :: jp !< grid index (x) of agent
1451	INTEGER(iwp) :: n !< index variable of agent
1452
1453	LOGICAL :: pack_done !< flag to indicate that packing is done
1454
1455	TYPE(agent_type), DIMENSION(:), INTENT(IN) :: agent_array !< new agents in a grid box
1456	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: temp_ns !< temporary agent array for reallocation
1457
1458	pack_done = .FALSE.
1459
1460	DO n = 1, SIZE(agent_array)
1461
1462	IF ( .NOT. agent_array(n)%agent_mask ) CYCLE
1463
1464	ip = agent_array(n)%x * ddx
1465	jp = agent_array(n)%y * ddy
1466
1467	IF ( ip >= nxl .AND. ip <= nxr .AND. jp >= nys .AND. jp <= nyn ) THEN ! agent stays on processor
1468	number_of_agents = agt_count(jp,ip)
1469	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1470
1471	aindex = agt_count(jp,ip)+1
1472	IF( aindex > SIZE( grid_agents(jp,ip)%agents ) ) THEN
1473	IF ( pack_done ) THEN
1474	CALL mas_eh_realloc_agents_array (ip,jp)
1475	ELSE
1476	CALL mas_ps_pack
1477	agt_count(jp,ip) = number_of_agents
1478	aindex = agt_count(jp,ip)+1
1479	IF ( aindex > SIZE( grid_agents(jp,ip)%agents ) ) THEN
1480	CALL mas_eh_realloc_agents_array (ip,jp)
1481	ENDIF
1482	pack_done = .TRUE.
1483	ENDIF
1484	ENDIF
1485	grid_agents(jp,ip)%agents(aindex) = agent_array(n)
1486	agt_count(jp,ip) = aindex
1487	ELSE
1488	IF ( jp <= nys - 1 ) THEN
1489	nr_move_south = nr_move_south+1
1490	!
1491	!-- Before agent information is swapped to exchange-array, check if enough memory is
1492	!-- allocated. If required, reallocate exchange array.
1493	IF ( nr_move_south > SIZE( move_also_south ) ) THEN
1494	!
1495	!-- At first, allocate further temporary array to swap agent information.
1496	ALLOCATE( temp_ns( SIZE( move_also_south ) + nr_2_direction_move ) )
1497	temp_ns(1:nr_move_south-1) = move_also_south(1:nr_move_south-1)
1498	DEALLOCATE( move_also_south )
1499	ALLOCATE( move_also_south( SIZE(temp_ns) ) )
1500	move_also_south(1:nr_move_south-1) = temp_ns(1:nr_move_south-1)
1501	DEALLOCATE( temp_ns )
1502
1503	ENDIF
1504
1505	move_also_south(nr_move_south) = agent_array(n)
1506
1507	IF ( jp == -1 ) THEN
1508	!
1509	!-- Apply boundary condition along y
1510	IF ( ibc_mas_ns == 0 ) THEN
1511	move_also_south(nr_move_south)%y = move_also_south(nr_move_south)%y &
1512	+ ( ny + 1 ) * dy
1513	move_also_south(nr_move_south)%origin_y = &
1514	move_also_south(nr_move_south)%origin_y &
1515	+ ( ny + 1 ) * dy
1516	ELSEIF ( ibc_mas_ns == 1 ) THEN
1517	!
1518	!-- Agent absorption
1519	move_also_south(nr_move_south)%agent_mask = .FALSE.
1520	deleted_agents = deleted_agents + 1
1521
1522	ENDIF
1523	ENDIF
1524	ELSEIF ( jp >= nyn+1 ) THEN
1525	nr_move_north = nr_move_north+1
1526	!
1527	!-- Before agent information is swapped to exchange-array, check if enough memory is
1528	!-- allocated. If required, reallocate exchange array.
1529	IF ( nr_move_north > SIZE( move_also_north ) ) THEN
1530	!
1531	!-- At first, allocate further temporary array to swap agent information.
1532	ALLOCATE( temp_ns( SIZE( move_also_north ) + nr_2_direction_move ) )
1533	temp_ns(1:nr_move_north-1) = move_also_south(1:nr_move_north-1)
1534	DEALLOCATE( move_also_north )
1535	ALLOCATE( move_also_north(SIZE(temp_ns)) )
1536	move_also_north(1:nr_move_north-1) = temp_ns(1:nr_move_north-1)
1537	DEALLOCATE( temp_ns )
1538
1539	ENDIF
1540
1541	move_also_north(nr_move_north) = agent_array(n)
1542	IF ( jp == ny+1 ) THEN
1543	!
1544	!-- Apply boundary condition along y
1545	IF ( ibc_mas_ns == 0 ) THEN
1546
1547	move_also_north(nr_move_north)%y = move_also_north(nr_move_north)%y &
1548	- ( ny + 1 ) * dy
1549	move_also_north(nr_move_north)%origin_y = &
1550	move_also_north(nr_move_north)%origin_y &
1551	- ( ny + 1 ) * dy
1552	ELSEIF ( ibc_mas_ns == 1 ) THEN
1553	!
1554	!-- Agent absorption
1555	move_also_north(nr_move_north)%agent_mask = .FALSE.
1556	deleted_agents = deleted_agents + 1
1557
1558	ENDIF
1559	ENDIF
1560	ENDIF
1561	ENDIF
1562	ENDDO
1563
1564	RETURN
1565
1566	END SUBROUTINE mas_eh_add_agents_to_gridcell
1567	#endif
1568
1569
1570	#if defined( __parallel )
1571	!--------------------------------------------------------------------------------------------------!
1572	! Description:
1573	! ------------
1574	!> After ghost layer agents have been received from neighboring PEs, this subroutine sorts them into
1575	!> the corresponding grid cells
1576	!--------------------------------------------------------------------------------------------------!
1577	SUBROUTINE mas_eh_add_ghost_agents_to_gridcell (agent_array)
1578
1579	IMPLICIT NONE
1580
1581	INTEGER(iwp) :: aindex !< dummy argument for new number of agents per grid box
1582	INTEGER(iwp) :: ip !< grid index (x) of agent
1583	INTEGER(iwp) :: jp !< grid index (x) of agent
1584	INTEGER(iwp) :: n !< index variable of agent
1585
1586	LOGICAL :: pack_done !< flag to indicate that packing is done
1587
1588	TYPE(agent_type), DIMENSION(:), INTENT(IN) :: agent_array !< new agents in a grid box
1589
1590	pack_done = .FALSE.
1591
1592	DO n = 1, SIZE(agent_array)
1593
1594	IF ( .NOT. agent_array(n)%agent_mask ) CYCLE
1595
1596	ip = agent_array(n)%x * ddx
1597	jp = agent_array(n)%y * ddy
1598
1599	IF ( ip < nxl .OR. ip > nxr .OR. jp < nys .OR. jp > nyn ) THEN
1600	number_of_agents = agt_count(jp,ip)
1601	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1602
1603	aindex = agt_count(jp,ip)+1
1604	IF( aindex > SIZE( grid_agents(jp,ip)%agents ) ) THEN
1605	IF ( pack_done ) THEN
1606	CALL mas_eh_realloc_agents_array (ip,jp)
1607	ELSE
1608	CALL mas_ps_pack
1609	agt_count(jp,ip) = number_of_agents
1610	aindex = agt_count(jp,ip)+1
1611	IF ( aindex > SIZE( grid_agents(jp,ip)%agents ) ) THEN
1612	CALL mas_eh_realloc_agents_array (ip,jp)
1613	ENDIF
1614	pack_done = .TRUE.
1615	ENDIF
1616	ENDIF
1617	grid_agents(jp,ip)%agents(aindex) = agent_array(n)
1618	agt_count(jp,ip) = aindex
1619	ENDIF
1620	ENDDO
1621	END SUBROUTINE mas_eh_add_ghost_agents_to_gridcell
1622	#endif
1623
1624	!--------------------------------------------------------------------------------------------------!
1625	! Description:
1626	! ------------
1627	!> Resizing of agent arrays
1628	!--------------------------------------------------------------------------------------------------!
1629	SUBROUTINE mas_eh_dealloc_agents_array
1630
1631	IMPLICIT NONE
1632
1633	INTEGER(iwp) :: i !< grid index (x) of agent
1634	INTEGER(iwp) :: j !< grid index (y) of agent
1635	INTEGER(iwp) :: new_size !< new array size
1636	INTEGER(iwp) :: noa !< number of agents
1637	INTEGER(iwp) :: old_size !< old array size
1638
1639	LOGICAL :: dealloc !< flag that indicates if reallocation is necessary
1640
1641	TYPE(agent_type), DIMENSION(10) :: tmp_agents_s !< temporary static agent array
1642
1643	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: tmp_agents_d !< temporary dynamic agent array
1644
1645	DO i = nxlg, nxrg
1646	DO j = nysg, nyng
1647	!
1648	!-- Determine number of active agents
1649	noa = agt_count(j,i)
1650	!
1651	!-- Determine allocated memory size
1652	old_size = SIZE( grid_agents(j,i)%agents )
1653	!
1654	!-- Check for large unused memory
1655	dealloc = ( ( noa < min_nr_agent .AND. old_size > min_nr_agent ) .OR. &
1656	( noa > min_nr_agent .AND. &
1657	old_size - noa * ( 1.0_wp + 0.01_wp * alloc_factor_mas ) > 0.0_wp ) &
1658	)
1659	!
1660	!-- If large unused memory was found, resize the corresponding array
1661	IF ( dealloc ) THEN
1662	IF ( noa < min_nr_agent ) THEN
1663	new_size = min_nr_agent
1664	ELSE
1665	new_size = INT( noa * ( 1.0_wp + 0.01_wp * alloc_factor_mas ) )
1666	ENDIF
1667
1668	IF ( noa <= 10 ) THEN
1669
1670	tmp_agents_s(1:noa) = grid_agents(j,i)%agents(1:noa)
1671
1672	DEALLOCATE(grid_agents(j,i)%agents)
1673	ALLOCATE(grid_agents(j,i)%agents(1:new_size))
1674
1675	grid_agents(j,i)%agents(1:noa) = tmp_agents_s(1:noa)
1676	grid_agents(j,i)%agents(noa+1:new_size) = zero_agent
1677
1678	ELSE
1679
1680	ALLOCATE(tmp_agents_d(noa))
1681	tmp_agents_d(1:noa) = grid_agents(j,i)%agents(1:noa)
1682
1683	DEALLOCATE(grid_agents(j,i)%agents)
1684	ALLOCATE(grid_agents(j,i)%agents(new_size))
1685
1686	grid_agents(j,i)%agents(1:noa) = tmp_agents_d(1:noa)
1687	grid_agents(j,i)%agents(noa+1:new_size) = zero_agent
1688
1689	DEALLOCATE(tmp_agents_d)
1690
1691	ENDIF
1692
1693	ENDIF
1694	ENDDO
1695	ENDDO
1696
1697	END SUBROUTINE mas_eh_dealloc_agents_array
1698
1699	!--------------------------------------------------------------------------------------------------!
1700	! Description:
1701	! ------------
1702	!> Exchange between subdomains.
1703	!> As soon as one agent has moved beyond the boundary of the domain, it is included in the relevant
1704	!> transfer arrays and marked for subsequent deletion on this PE.
1705	!> First sweep for crossings in x direction. Find out first the number of agents to be transferred
1706	!> and allocate temporary arrays needed to store them.
1707	!> For a one-dimensional decomposition along y, no transfer is necessary, because the agent remains
1708	!> on the PE, but the agent coordinate has to be adjusted.
1709	!--------------------------------------------------------------------------------------------------!
1710	SUBROUTINE mas_eh_exchange_horiz
1711
1712	IMPLICIT NONE
1713
1714	INTEGER(iwp) :: ip !< index variable along x
1715	INTEGER(iwp) :: jp !< index variable along y
1716	INTEGER(iwp) :: n !< agent index variable
1717
1718	#if defined( __parallel )
1719
1720	INTEGER(iwp) :: i !< grid index (x) of agent positition
1721	INTEGER(iwp) :: j !< grid index (y) of agent positition
1722	INTEGER(iwp) :: par_size !< Agent size in bytes
1723
1724	INTEGER(iwp) :: trla_count !< number of agents send to left PE
1725	INTEGER(iwp) :: trla_count_recv !< number of agents receive from right PE
1726	INTEGER(iwp) :: trna_count !< number of agents send to north PE
1727	INTEGER(iwp) :: trna_count_recv !< number of agents receive from south PE
1728	INTEGER(iwp) :: trra_count !< number of agents send to right PE
1729	INTEGER(iwp) :: trra_count_recv !< number of agents receive from left PE
1730	INTEGER(iwp) :: trsa_count !< number of agents send to south PE
1731	INTEGER(iwp) :: trsa_count_recv !< number of agents receive from north PE
1732
1733	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvla !< agents received from right PE
1734	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvna !< agents received from south PE
1735	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvra !< agents received from left PE
1736	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvsa !< agents received from north PE
1737	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trla !< agents send to left PE
1738	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trna !< agents send to north PE
1739	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trra !< agents send to right PE
1740	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trsa !< agents send to south PE
1741
1742	!
1743	!-- Exchange between subdomains.
1744	!-- As soon as one agent has moved beyond the boundary of the domain, it is included in the relevant
1745	!-- transfer arrays and marked for subsequent deletion on this PE.
1746	!-- First sweep for crossings in x direction. Find out first the number of agents to be transferred
1747	!-- and allocate temporary arrays needed to store them.
1748	!-- For a one-dimensional decomposition along y, no transfer is necessary, because the agent remains
1749	!-- on the PE, but the agent coordinate has to be adjusted.
1750	trla_count = 0
1751	trra_count = 0
1752
1753	trla_count_recv = 0
1754	trra_count_recv = 0
1755
1756	IF ( pdims(1) /= 1 ) THEN
1757	!
1758	!-- First calculate the storage necessary for sending and receiving the data.
1759	!-- Compute only first (nxl) and last (nxr) loop iterration.
1760	DO ip = nxl, nxr, nxr - nxl
1761	DO jp = nys, nyn
1762
1763	number_of_agents = agt_count(jp,ip)
1764	IF ( number_of_agents <= 0 ) CYCLE
1765	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1766	DO n = 1, number_of_agents
1767	IF ( agents(n)%agent_mask ) THEN
1768	i = agents(n)%x * ddx
1769	!
1770	!-- Above calculation does not work for indices less than zero
1771	IF ( agents(n)%x < 0.0_wp ) i = -1
1772
1773	IF ( i < nxl ) THEN
1774	trla_count = trla_count + 1
1775	ELSEIF ( i > nxr ) THEN
1776	trra_count = trra_count + 1
1777	ENDIF
1778	ENDIF
1779	ENDDO
1780
1781	ENDDO
1782	ENDDO
1783
1784	IF ( trla_count == 0 ) trla_count = 1
1785	IF ( trra_count == 0 ) trra_count = 1
1786
1787	ALLOCATE( trla(trla_count), trra(trra_count) )
1788
1789	trla = zero_agent
1790	trra = zero_agent
1791
1792	trla_count = 0
1793	trra_count = 0
1794
1795	ENDIF
1796	!
1797	!-- Compute only first (nxl) and last (nxr) loop iterration
1798	DO ip = nxl, nxr, nxr-nxl
1799	DO jp = nys, nyn
1800	number_of_agents = agt_count(jp,ip)
1801	IF ( number_of_agents <= 0 ) CYCLE
1802	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1803	DO n = 1, number_of_agents
1804	!
1805	!-- Only those agents that have not been marked as 'deleted' may be moved.
1806	IF ( agents(n)%agent_mask ) THEN
1807
1808	i = agents(n)%x * ddx
1809	!
1810	!-- Above calculation does not work for indices less than zero
1811	IF ( agents(n)%x < 0.0_wp ) i = -1
1812
1813	IF ( i < nxl ) THEN
1814	IF ( i < 0 ) THEN
1815	!
1816	!-- Apply boundary condition along x
1817	IF ( ibc_mas_lr == 0 ) THEN
1818	!
1819	!-- Cyclic condition
1820	IF ( pdims(1) == 1 ) THEN
1821	agents(n)%x = ( nx + 1 ) * dx + agents(n)%x
1822	agents(n)%origin_x = ( nx + 1 ) * dx + agents(n)%origin_x
1823	ELSE
1824	trla_count = trla_count + 1
1825	trla(trla_count) = agents(n)
1826	trla(trla_count)%x = ( nx + 1 ) * dx + trla(trla_count)%x
1827	trla(trla_count)%origin_x = trla(trla_count)%origin_x + ( nx + 1 ) * dx
1828	agents(n)%agent_mask = .FALSE.
1829	deleted_agents = deleted_agents + 1
1830
1831	IF ( trla(trla_count)%x >= (nx + 1)* dx - 1.0E-12_wp ) THEN
1832	trla(trla_count)%x = trla(trla_count)%x - 1.0E-10_wp
1833	trla(trla_count)%origin_x = trla(trla_count)%origin_x - 1
1834	ENDIF
1835
1836	ENDIF
1837
1838	ELSEIF ( ibc_mas_lr == 1 ) THEN
1839	!
1840	!-- Agent absorption
1841	agents(n)%agent_mask = .FALSE.
1842	deleted_agents = deleted_agents + 1
1843
1844	ENDIF
1845	ELSE
1846	!
1847	!-- Store agent data in the transfer array, which will be send to the neighbouring
1848	!-- PE.
1849	trla_count = trla_count + 1
1850	trla(trla_count) = agents(n)
1851	agents(n)%agent_mask = .FALSE.
1852	deleted_agents = deleted_agents + 1
1853
1854	ENDIF
1855
1856	ELSEIF ( i > nxr ) THEN
1857	IF ( i > nx ) THEN
1858	!
1859	!-- Apply boundary condition along x
1860	IF ( ibc_mas_lr == 0 ) THEN
1861	!
1862	!-- Cyclic condition
1863	IF ( pdims(1) == 1 ) THEN
1864	agents(n)%x = agents(n)%x - ( nx + 1 ) * dx
1865	agents(n)%origin_x = agents(n)%origin_x - ( nx + 1 ) * dx
1866	ELSE
1867	trra_count = trra_count + 1
1868	trra(trra_count) = agents(n)
1869	trra(trra_count)%x = trra(trra_count)%x - ( nx + 1 ) * dx
1870	trra(trra_count)%origin_x = trra(trra_count)%origin_x - ( nx + 1 ) * dx
1871	agents(n)%agent_mask = .FALSE.
1872	deleted_agents = deleted_agents + 1
1873
1874	ENDIF
1875
1876	ELSEIF ( ibc_mas_lr == 1 ) THEN
1877	!
1878	!-- Agent absorption
1879	agents(n)%agent_mask = .FALSE.
1880	deleted_agents = deleted_agents + 1
1881
1882	ENDIF
1883	ELSE
1884	!
1885	!-- Store agent data in the transfer array, which will be send to the neighbouring
1886	!-- PE.
1887	trra_count = trra_count + 1
1888	trra(trra_count) = agents(n)
1889	agents(n)%agent_mask = .FALSE.
1890	deleted_agents = deleted_agents + 1
1891
1892	ENDIF
1893
1894	ENDIF
1895	ENDIF
1896
1897	ENDDO
1898	ENDDO
1899	ENDDO
1900
1901	!
1902	!-- Allocate arrays required for north-south exchange, as these are used directly after agents are
1903	!-- exchange along x-direction.
1904	ALLOCATE( move_also_north(1:nr_2_direction_move) )
1905	ALLOCATE( move_also_south(1:nr_2_direction_move) )
1906
1907	nr_move_north = 0
1908	nr_move_south = 0
1909	!
1910	!-- Send left boundary, receive right boundary (but first exchange how many and check if agent
1911	!-- storage must be extended).
1912	IF ( pdims(1) /= 1 ) THEN
1913
1914	CALL MPI_SENDRECV( trla_count, 1, MPI_INTEGER, pleft, 0, &
1915	trra_count_recv, 1, MPI_INTEGER, pright, 0, &
1916	comm2d, status, ierr )
1917
1918	ALLOCATE( rvra(MAX( 1,trra_count_recv )) )
1919	!
1920	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit variables in structure
1921	!-- agent_type (due to the calculation of par_size)
1922	par_size = STORAGE_SIZE( trla(1) ) / 8
1923	CALL MPI_SENDRECV( trla, MAX( 1, trla_count ) * par_size, MPI_BYTE, pleft, 1, &
1924	rvra, MAX( 1, trra_count_recv )* par_size, MPI_BYTE, pright, 1, &
1925	comm2d, status, ierr )
1926
1927	IF ( trra_count_recv > 0 ) THEN
1928	CALL mas_eh_add_agents_to_gridcell(rvra(1:trra_count_recv))
1929	ENDIF
1930
1931	DEALLOCATE(rvra)
1932
1933	!
1934	!-- Send right boundary, receive left boundary
1935	CALL MPI_SENDRECV( trra_count, 1, MPI_INTEGER, pright, 0, &
1936	trla_count_recv, 1, MPI_INTEGER, pleft, 0, &
1937	comm2d, status, ierr )
1938
1939	ALLOCATE(rvla(MAX(1,trla_count_recv)))
1940	!
1941	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit variables in structure
1942	!-- agent_type (due to the calculation of par_size)
1943	par_size = STORAGE_SIZE(trra(1))/8
1944	CALL MPI_SENDRECV( trra, MAX( 1, trra_count ) * par_size, MPI_BYTE, pright, 1, &
1945	rvla, MAX(1,trla_count_recv) * par_size, MPI_BYTE, pleft, 1, &
1946	comm2d, status, ierr )
1947
1948	IF ( trla_count_recv > 0 ) THEN
1949	CALL mas_eh_add_agents_to_gridcell(rvla(1:trla_count_recv))
1950	ENDIF
1951
1952	DEALLOCATE( rvla )
1953	DEALLOCATE( trla, trra )
1954
1955	ENDIF
1956
1957	!
1958	!-- Check whether agents have crossed the boundaries in y direction. Note that this case can also
1959	!-- apply to agents that have just been received from the adjacent right or left PE.
1960	!-- Find out first the number of agents to be transferred and allocate temporary arrays needed to
1961	!-- store them.
1962	!-- For a one-dimensional decomposition along y, no transfer is necessary, because the agent remains
1963	!-- on the PE.
1964	trsa_count = nr_move_south
1965	trna_count = nr_move_north
1966
1967	trsa_count_recv = 0
1968	trna_count_recv = 0
1969
1970	IF ( pdims(2) /= 1 ) THEN
1971	!
1972	!-- First calculate the storage necessary for sending and receiving the data.
1973	DO ip = nxl, nxr
1974	DO jp = nys, nyn, nyn-nys ! compute only first (nys) and last (nyn) loop iterration
1975	number_of_agents = agt_count(jp,ip)
1976	IF ( number_of_agents <= 0 ) CYCLE
1977	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1978	DO n = 1, number_of_agents
1979	IF ( agents(n)%agent_mask ) THEN
1980	j = agents(n)%y * ddy
1981	!
1982	!-- Above calculation does not work for indices less than zero
1983	IF ( agents(n)%y < 0.0_wp ) j = -1
1984
1985	IF ( j < nys ) THEN
1986	trsa_count = trsa_count + 1
1987	ELSEIF ( j > nyn ) THEN
1988	trna_count = trna_count + 1
1989	ENDIF
1990	ENDIF
1991	ENDDO
1992	ENDDO
1993	ENDDO
1994
1995	IF ( trsa_count == 0 ) trsa_count = 1
1996	IF ( trna_count == 0 ) trna_count = 1
1997
1998	ALLOCATE( trsa(trsa_count), trna(trna_count) )
1999
2000	trsa = zero_agent
2001	trna = zero_agent
2002
2003	trsa_count = nr_move_south
2004	trna_count = nr_move_north
2005
2006	trsa(1:nr_move_south) = move_also_south(1:nr_move_south)
2007	trna(1:nr_move_north) = move_also_north(1:nr_move_north)
2008
2009	ENDIF
2010
2011	DO ip = nxl, nxr
2012	DO jp = nys, nyn, nyn-nys ! compute only first (nys) and last (nyn) loop iterration
2013	number_of_agents = agt_count(jp,ip)
2014	IF ( number_of_agents <= 0 ) CYCLE
2015	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
2016	DO n = 1, number_of_agents
2017	!
2018	!-- Only those agents that have not been marked as 'deleted' may be moved.
2019	IF ( agents(n)%agent_mask ) THEN
2020
2021	j = agents(n)%y * ddy
2022	!
2023	!-- Above calculation does not work for indices less than zero
2024	IF ( agents(n)%y < 0.0_wp * dy ) j = -1
2025
2026	IF ( j < nys ) THEN
2027	IF ( j < 0 ) THEN
2028	!
2029	!-- Apply boundary condition along y
2030	IF ( ibc_mas_ns == 0 ) THEN
2031	!
2032	!-- Cyclic condition
2033	IF ( pdims(2) == 1 ) THEN
2034	agents(n)%y = ( ny + 1 ) * dy + agents(n)%y
2035	agents(n)%origin_y = ( ny + 1 ) * dy + agents(n)%origin_y
2036	ELSE
2037	trsa_count = trsa_count + 1
2038	trsa(trsa_count) = agents(n)
2039	trsa(trsa_count)%y = ( ny + 1 ) * dy + trsa(trsa_count)%y
2040	trsa(trsa_count)%origin_y = trsa(trsa_count)%origin_y + ( ny + 1 ) * dy
2041	agents(n)%agent_mask = .FALSE.
2042	deleted_agents = deleted_agents + 1
2043
2044	IF ( trsa(trsa_count)%y >= (ny+1)* dy - 1.0E-12_wp ) THEN
2045	trsa(trsa_count)%y = trsa(trsa_count)%y - 1.0E-10_wp
2046	trsa(trsa_count)%origin_y = trsa(trsa_count)%origin_y - 1
2047	ENDIF
2048
2049	ENDIF
2050
2051	ELSEIF ( ibc_mas_ns == 1 ) THEN
2052	!
2053	!-- Agent absorption
2054	agents(n)%agent_mask = .FALSE.
2055	deleted_agents = deleted_agents + 1
2056
2057	ENDIF
2058	ELSE
2059	!
2060	!-- Store agent data in the transfer array, which will be send to the neighbouring
2061	!-- PE.
2062	trsa_count = trsa_count + 1
2063	trsa(trsa_count) = agents(n)
2064	agents(n)%agent_mask = .FALSE.
2065	deleted_agents = deleted_agents + 1
2066
2067	ENDIF
2068
2069	ELSEIF ( j > nyn ) THEN
2070	IF ( j > ny ) THEN
2071	!
2072	!-- Apply boundary condition along y
2073	IF ( ibc_mas_ns == 0 ) THEN
2074	!
2075	!-- Cyclic condition
2076	IF ( pdims(2) == 1 ) THEN
2077	agents(n)%y = agents(n)%y - ( ny + 1 ) * dy
2078	agents(n)%origin_y = agents(n)%origin_y - ( ny + 1 ) * dy
2079	ELSE
2080	trna_count = trna_count + 1
2081	trna(trna_count) = agents(n)
2082	trna(trna_count)%y = trna(trna_count)%y - ( ny + 1 ) * dy
2083	trna(trna_count)%origin_y = trna(trna_count)%origin_y - ( ny + 1 ) * dy
2084	agents(n)%agent_mask = .FALSE.
2085	deleted_agents = deleted_agents + 1
2086	ENDIF
2087
2088	ELSEIF ( ibc_mas_ns == 1 ) THEN
2089	!
2090	!-- Agent absorption
2091	agents(n)%agent_mask = .FALSE.
2092	deleted_agents = deleted_agents + 1
2093
2094	ENDIF
2095	ELSE
2096	!
2097	!-- Store agent data in the transfer array, which will be send to the neighbouring
2098	!-- PE
2099	trna_count = trna_count + 1
2100	trna(trna_count) = agents(n)
2101	agents(n)%agent_mask = .FALSE.
2102	deleted_agents = deleted_agents + 1
2103
2104	ENDIF
2105
2106	ENDIF
2107	ENDIF
2108	ENDDO
2109	ENDDO
2110	ENDDO
2111
2112	!
2113	!-- Send front boundary, receive back boundary (but first exchange how many and check if agent
2114	!-- storage must be extended).
2115	IF ( pdims(2) /= 1 ) THEN
2116
2117	CALL MPI_SENDRECV( trsa_count, 1, MPI_INTEGER, psouth, 0, &
2118	trna_count_recv, 1, MPI_INTEGER, pnorth, 0, &
2119	comm2d, status, ierr )
2120
2121	ALLOCATE( rvna( MAX( 1, trna_count_recv )) )
2122	!
2123	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit variables in structure
2124	!-- agent_type (due to the calculation of par_size)
2125	par_size = STORAGE_SIZE(trsa(1))/8
2126	CALL MPI_SENDRECV( trsa, trsa_count * par_size, MPI_BYTE, psouth, 1, &
2127	rvna, trna_count_recv * par_size, MPI_BYTE, pnorth, 1, &
2128	comm2d, status, ierr )
2129
2130	IF ( trna_count_recv > 0 ) THEN
2131	CALL mas_eh_add_agents_to_gridcell(rvna(1:trna_count_recv))
2132	ENDIF
2133
2134	DEALLOCATE( rvna )
2135
2136	!
2137	!-- Send back boundary, receive front boundary
2138	CALL MPI_SENDRECV( trna_count, 1, MPI_INTEGER, pnorth, 0, &
2139	trsa_count_recv, 1, MPI_INTEGER, psouth, 0, &
2140	comm2d, status, ierr )
2141
2142	ALLOCATE( rvsa( MAX( 1, trsa_count_recv )) )
2143	!
2144	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit variables in structure
2145	!-- agent_type (due to the calculation of par_size)
2146	par_size = STORAGE_SIZE( trna(1) ) / 8
2147	CALL MPI_SENDRECV( trna, trna_count * par_size, MPI_BYTE, pnorth, 1, &
2148	rvsa, trsa_count_recv * par_size, MPI_BYTE, psouth, 1, &
2149	comm2d, status, ierr )
2150
2151	IF ( trsa_count_recv > 0 ) THEN
2152	CALL mas_eh_add_agents_to_gridcell(rvsa(1:trsa_count_recv))
2153	ENDIF
2154
2155	DEALLOCATE( rvsa )
2156
2157	number_of_agents = number_of_agents + trsa_count_recv
2158
2159	DEALLOCATE( trsa, trna )
2160
2161	ENDIF
2162
2163	DEALLOCATE( move_also_north )
2164	DEALLOCATE( move_also_south )
2165
2166	!
2167	!-- Accumulate the number of agents transferred between the subdomains)
2168	CALL mas_eh_ghost_exchange
2169
2170	#else
2171
2172	DO ip = nxl, nxr, nxr-nxl
2173	DO jp = nys, nyn
2174	number_of_agents = agt_count(jp,ip)
2175	IF ( number_of_agents <= 0 ) CYCLE
2176	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
2177	DO n = 1, number_of_agents
2178	!
2179	!-- Apply boundary conditions
2180	IF ( agents(n)%x < 0.0_wp ) THEN
2181
2182	IF ( ibc_mas_lr == 0 ) THEN
2183	!
2184	!-- Cyclic boundary. Relevant coordinate has to be changed.
2185	agents(n)%x = ( nx + 1 ) * dx + agents(n)%x
2186	agents(n)%origin_x = ( nx + 1 ) * dx + agents(n)%origin_x
2187	ELSEIF ( ibc_mas_lr == 1 ) THEN
2188	!
2189	!-- Agent absorption
2190	agents(n)%agent_mask = .FALSE.
2191	deleted_agents = deleted_agents + 1
2192	ENDIF
2193
2194	ELSEIF ( agents(n)%x >= ( nx + 1 ) * dx ) THEN
2195
2196	IF ( ibc_mas_lr == 0 ) THEN
2197	!
2198	!-- Cyclic boundary. Relevant coordinate has to be changed.
2199	agents(n)%x = agents(n)%x - ( nx + 1 ) * dx
2200
2201	ELSEIF ( ibc_mas_lr == 1 ) THEN
2202	!
2203	!-- Agent absorption
2204	agents(n)%agent_mask = .FALSE.
2205	deleted_agents = deleted_agents + 1
2206	ENDIF
2207
2208	ENDIF
2209	ENDDO
2210	ENDDO
2211	ENDDO
2212
2213	DO ip = nxl, nxr
2214	DO jp = nys, nyn, nyn-nys
2215	number_of_agents = agt_count(jp,ip)
2216	IF ( number_of_agents <= 0 ) CYCLE
2217	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
2218	DO n = 1, number_of_agents
2219
2220	IF ( agents(n)%y < 0.0_wp ) THEN
2221
2222	IF ( ibc_mas_ns == 0 ) THEN
2223	!
2224	!-- Cyclic boundary. Relevant coordinate has to be changed.
2225	agents(n)%y = ( ny + 1 ) * dy + agents(n)%y
2226	agents(n)%origin_y = ( ny + 1 ) * dy + &
2227	agents(n)%origin_y
2228
2229	ELSEIF ( ibc_mas_ns == 1 ) THEN
2230	!
2231	!-- Agent absorption
2232	agents(n)%agent_mask = .FALSE.
2233	deleted_agents = deleted_agents + 1
2234	ENDIF
2235
2236	ELSEIF ( agents(n)%y >= ( ny + 0.5_wp ) * dy ) THEN
2237
2238	IF ( ibc_mas_ns == 0 ) THEN
2239	!
2240	!-- Cyclic boundary. Relevant coordinate has to be changed.
2241	agents(n)%y = agents(n)%y - ( ny + 1 ) * dy
2242
2243	ELSEIF ( ibc_mas_ns == 1 ) THEN
2244	!
2245	!-- Agent absorption
2246	agents(n)%agent_mask = .FALSE.
2247	deleted_agents = deleted_agents + 1
2248	ENDIF
2249
2250	ENDIF
2251
2252	ENDDO
2253	ENDDO
2254	ENDDO
2255	#endif
2256
2257	END SUBROUTINE mas_eh_exchange_horiz
2258
2259
2260	#if defined( __parallel )
2261	!--------------------------------------------------------------------------------------------------!
2262	! Description:
2263	! ------------
2264	!> Sends the agents from the three gridcells closest to the north/south/left/right border of a PE to
2265	!> the corresponding neighbors ghost layer (which is three grid boxes deep)
2266	!--------------------------------------------------------------------------------------------------!
2267	SUBROUTINE mas_eh_ghost_exchange
2268
2269	IMPLICIT NONE
2270
2271	INTEGER(iwp) :: agt_size !< Bit size of agent datatype
2272	INTEGER(iwp) :: ghla_count !< ghost points left agent
2273	INTEGER(iwp) :: ghna_count !< ghost points north agent
2274	INTEGER(iwp) :: ghra_count !< ghost points right agent
2275	INTEGER(iwp) :: ghsa_count !< ghost points south agent
2276	INTEGER(iwp) :: ip !< index variable along x
2277	INTEGER(iwp) :: jp !< index variable along y
2278
2279	LOGICAL :: ghla_empty !< ghost points left agent
2280	LOGICAL :: ghla_empty_rcv !< ghost points left agent
2281	LOGICAL :: ghna_empty !< ghost points north agent
2282	LOGICAL :: ghna_empty_rcv !< ghost points north agent
2283	LOGICAL :: ghra_empty !< ghost points right agent
2284	LOGICAL :: ghra_empty_rcv !< ghost points right agent
2285	LOGICAL :: ghsa_empty !< ghost points south agent
2286	LOGICAL :: ghsa_empty_rcv !< ghost points south agent
2287
2288	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghla !< agents received from right PE
2289	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghna !< agents received from south PE
2290	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghra !< agents received from left PE
2291	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghsa !< agents received from north PE
2292
2293	ghla_empty = .TRUE.
2294	ghna_empty = .TRUE.
2295	ghra_empty = .TRUE.
2296	ghsa_empty = .TRUE.
2297	!
2298	!-- Reset ghost layer
2299	DO ip = nxlg, nxl-1
2300	DO jp = nysg, nyng
2301	agt_count(jp,ip) = 0
2302	ENDDO
2303	ENDDO
2304	DO ip = nxr+1, nxrg
2305	DO jp = nysg, nyng
2306	agt_count(jp,ip) = 0
2307	ENDDO
2308	ENDDO
2309	DO ip = nxl, nxr
2310	DO jp = nysg, nys-1
2311	agt_count(jp,ip) = 0
2312	ENDDO
2313	ENDDO
2314	DO ip = nxl, nxr
2315	DO jp = nyn+1, nyng
2316	agt_count(jp,ip) = 0
2317	ENDDO
2318	ENDDO
2319	!
2320	!-- Transfer of agents from left to right and vice versa
2321	IF ( pdims(1) /= 1 ) THEN
2322	!
2323	!-- Reset left and right ghost layers
2324	ghla_count = 0
2325	ghra_count = 0
2326	!
2327	!-- First calculate the storage necessary for sending and receiving the data.
2328	ghla_count = SUM(agt_count(nys:nyn,nxl:nxl+2))
2329	ghra_count = SUM(agt_count(nys:nyn,nxr-2:nxr))
2330	!
2331	!-- No cyclic boundaries for agents
2332	IF ( nxl == 0 .OR. ghla_count == 0 ) THEN
2333	ghla_count = 1
2334	ELSE
2335	ghla_empty = .FALSE.
2336	ENDIF
2337	IF ( nxr == nx .OR. ghra_count == 0 ) THEN
2338	ghra_count = 1
2339	ELSE
2340	ghra_empty = .FALSE.
2341	ENDIF
2342	ALLOCATE( ghla(1:ghla_count), ghra(1:ghra_count) )
2343	ghla = zero_agent
2344	ghra = zero_agent
2345	!
2346	!-- Get all agents that will be sent left into one array
2347	ghla_count = 0
2348	IF ( nxl /= 0 ) THEN
2349	DO ip = nxl, nxl+2
2350	DO jp = nys, nyn
2351
2352	number_of_agents = agt_count(jp,ip)
2353	IF ( number_of_agents <= 0 ) CYCLE
2354	ghla(ghla_count+1:ghla_count+number_of_agents) &
2355	= grid_agents(jp,ip)%agents(1:number_of_agents)
2356	ghla_count = ghla_count + number_of_agents
2357
2358	ENDDO
2359	ENDDO
2360	ENDIF
2361	IF ( ghla_count == 0 ) ghla_count = 1
2362	!
2363	!-- Get all agents that will be sent right into one array
2364	ghra_count = 0
2365	IF ( nxr /= nx ) THEN
2366	DO ip = nxr-2, nxr
2367	DO jp = nys, nyn
2368
2369	number_of_agents = agt_count(jp,ip)
2370	IF ( number_of_agents <= 0 ) CYCLE
2371	ghra(ghra_count+1:ghra_count+number_of_agents) &
2372	= grid_agents(jp,ip)%agents(1:number_of_agents)
2373	ghra_count = ghra_count + number_of_agents
2374
2375	ENDDO
2376	ENDDO
2377	ENDIF
2378	IF ( ghra_count == 0 ) ghra_count = 1
2379	!
2380	!-- Send/receive number of agents that will be transferred to/from left/right neighbor.
2381	CALL MPI_SENDRECV( ghla_count, 1, MPI_INTEGER, pleft, 0, &
2382	ghra_count_recv, 1, MPI_INTEGER, pright, 0, &
2383	comm2d, status, ierr )
2384	ALLOCATE ( agt_gh_r(1:ghra_count_recv) )
2385	!
2386	!-- Send/receive number of agents that will be transferred to/from right/left neighbor
2387	CALL MPI_SENDRECV( ghra_count, 1, MPI_INTEGER, pright, 0, &
2388	ghla_count_recv, 1, MPI_INTEGER, pleft, 0, &
2389	comm2d, status, ierr )
2390	!
2391	!-- Send/receive flag that indicates if there are actually any agents in ghost layer
2392	CALL MPI_SENDRECV( ghla_empty, 1, MPI_LOGICAL, pleft, 1, &
2393	ghra_empty_rcv, 1, MPI_LOGICAL, pright,1, &
2394	comm2d, status, ierr )
2395	CALL MPI_SENDRECV( ghra_empty, 1, MPI_LOGICAL, pright,1, &
2396	ghla_empty_rcv, 1, MPI_LOGICAL, pleft, 1, &
2397	comm2d, status, ierr )
2398
2399
2400	ALLOCATE ( agt_gh_l(1:ghla_count_recv) )
2401	!
2402	!-- Get bit size of one agent
2403	agt_size = STORAGE_SIZE(zero_agent)/8
2404	!
2405	!-- Send/receive agents to/from left/right neighbor
2406	CALL MPI_SENDRECV( ghla, ghla_count * agt_size, MPI_BYTE, pleft, 1, &
2407	agt_gh_r, ghra_count_recv * agt_size, MPI_BYTE, pright,1, &
2408	comm2d, status, ierr )
2409	!
2410	!-- Send/receive agents to/from left/right neighbor
2411	CALL MPI_SENDRECV( ghra, ghra_count * agt_size, MPI_BYTE, pright,1, &
2412	agt_gh_l, ghla_count_recv * agt_size, MPI_BYTE, pleft, 1, &
2413	comm2d, status, ierr )
2414	!
2415	!-- If agents were received, add them to the respective ghost layer cells
2416	IF ( .NOT. ghra_empty_rcv ) THEN
2417	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_r)
2418	ENDIF
2419
2420	IF ( .NOT. ghla_empty_rcv ) THEN
2421	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_l)
2422	ENDIF
2423
2424	DEALLOCATE( ghla, ghra, agt_gh_l, agt_gh_r )
2425
2426	ENDIF
2427
2428	!
2429	!-- Transfer of agents from south to north and vice versa
2430	IF ( pdims(2) /= 1 ) THEN
2431	!
2432	!-- Reset south and north ghost layers
2433	ghsa_count = 0
2434	ghna_count = 0
2435	!
2436	!-- First calculate the storage necessary for sending and receiving the data.
2437	ghsa_count = SUM( agt_count(nys:nys+2,nxlg:nxrg) )
2438	ghna_count = SUM( agt_count(nyn-2:nyn,nxlg:nxrg) )
2439	!
2440	!-- No cyclic boundaries for agents
2441	IF ( nys == 0 .OR. ghsa_count == 0 ) THEN
2442	ghsa_count = 1
2443	ELSE
2444	ghsa_empty = .FALSE.
2445	ENDIF
2446	IF ( nyn == ny .OR. ghna_count == 0 ) THEN
2447	ghna_count = 1
2448	ELSE
2449	ghna_empty = .FALSE.
2450	ENDIF
2451	ALLOCATE( ghsa(1:ghsa_count), ghna(1:ghna_count) )
2452	ghsa = zero_agent
2453	ghna = zero_agent
2454	!
2455	!-- Get all agents that will be sent south into one array
2456	ghsa_count = 0
2457	IF ( nys /= 0 ) THEN
2458	DO ip = nxlg, nxrg
2459	DO jp = nys, nys+2
2460
2461	number_of_agents = agt_count(jp,ip)
2462	IF ( number_of_agents <= 0 ) CYCLE
2463	ghsa(ghsa_count+1:ghsa_count+number_of_agents) &
2464	= grid_agents(jp,ip)%agents(1:number_of_agents)
2465	ghsa_count = ghsa_count + number_of_agents
2466
2467	ENDDO
2468	ENDDO
2469	ENDIF
2470	IF ( ghsa_count == 0 ) ghsa_count = 1
2471	!
2472	!-- Get all agents that will be sent north into one array
2473	ghna_count = 0
2474	IF ( nyn /= ny ) THEN
2475	DO ip = nxlg, nxrg
2476	DO jp = nyn-2, nyn
2477
2478	number_of_agents = agt_count(jp,ip)
2479	IF ( number_of_agents <= 0 ) CYCLE
2480	ghna(ghna_count+1:ghna_count+number_of_agents) &
2481	= grid_agents(jp,ip)%agents(1:number_of_agents)
2482	ghna_count = ghna_count + number_of_agents
2483
2484	ENDDO
2485	ENDDO
2486	ENDIF
2487	IF ( ghna_count == 0 ) ghna_count = 1
2488	!
2489	!-- Send/receive number of agents that will be transferred to/from south/north neighbor
2490	CALL MPI_SENDRECV( ghsa_count, 1, MPI_INTEGER, psouth, 0, &
2491	ghna_count_recv, 1, MPI_INTEGER, pnorth, 0, &
2492	comm2d, status, ierr )
2493	ALLOCATE ( agt_gh_n(1:ghna_count_recv) )
2494	!
2495	!-- Send/receive number of agents that will be transferred to/from north/south neighbor
2496	CALL MPI_SENDRECV( ghna_count, 1, MPI_INTEGER, pnorth, 0, &
2497	ghsa_count_recv, 1, MPI_INTEGER, psouth, 0, &
2498	comm2d, status, ierr )
2499	!
2500	!-- Send/receive flag that indicates if there are actually any agents in ghost layer
2501	CALL MPI_SENDRECV( ghsa_empty, 1, MPI_LOGICAL, psouth, 1, &
2502	ghna_empty_rcv, 1, MPI_LOGICAL, pnorth, 1, &
2503	comm2d, status, ierr )
2504	CALL MPI_SENDRECV( ghna_empty, 1, MPI_LOGICAL, pnorth, 1, &
2505	ghsa_empty_rcv, 1, MPI_LOGICAL, psouth, 1, &
2506	comm2d, status, ierr )
2507
2508
2509	ALLOCATE ( agt_gh_s(1:ghsa_count_recv) )
2510	!
2511	!-- Get bit size of one agent
2512	agt_size = STORAGE_SIZE(zero_agent)/8
2513	!
2514	!-- Send/receive agents to/from south/north neighbor
2515	CALL MPI_SENDRECV( ghsa, ghsa_count * agt_size, MPI_BYTE, psouth,1, &
2516	agt_gh_n, ghna_count_recv * agt_size, MPI_BYTE, pnorth,1, &
2517	comm2d, status, ierr )
2518	!
2519	!-- Send/receive agents to/from south/north neighbor
2520	CALL MPI_SENDRECV( ghna, ghna_count * agt_size, MPI_BYTE, pnorth,1, &
2521	agt_gh_s, ghsa_count_recv * agt_size, MPI_BYTE, psouth,1, &
2522	comm2d, status, ierr )
2523	!
2524	!-- If agents were received, add them to the respective ghost layer cells
2525	IF ( .NOT. ghna_empty_rcv ) THEN
2526	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_n)
2527	ENDIF
2528
2529	IF ( .NOT. ghsa_empty_rcv ) THEN
2530	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_s)
2531	ENDIF
2532
2533	DEALLOCATE( ghna, ghsa, agt_gh_n, agt_gh_s )
2534
2535	ENDIF
2536
2537	END SUBROUTINE mas_eh_ghost_exchange
2538	#endif
2539
2540	!--------------------------------------------------------------------------------------------------!
2541	! Description:
2542	! ------------
2543	!> If an agent moves from one grid cell to another (on the current processor!), this subroutine
2544	!> moves the corresponding element from the agent array of the old grid cell to the agent array of
2545	!> the new grid cell.
2546	!--------------------------------------------------------------------------------------------------!
2547	SUBROUTINE mas_eh_move_agent
2548
2549	IMPLICIT NONE
2550
2551	INTEGER(iwp) :: aindex !< dummy argument for number of new agent per grid box
2552	INTEGER(iwp) :: i !< grid index (x) of agent position
2553	INTEGER(iwp) :: ip !< index variable along x
2554	INTEGER(iwp) :: j !< grid index (y) of agent position
2555	INTEGER(iwp) :: jp !< index variable along y
2556	INTEGER(iwp) :: n !< index variable for agent array
2557	INTEGER(iwp) :: na_before_move !< number of agents per grid box before moving
2558
2559	TYPE(agent_type), DIMENSION(:), POINTER :: agents_before_move !< agents before moving
2560
2561	DO ip = nxl, nxr
2562	DO jp = nys, nyn
2563
2564	na_before_move = agt_count(jp,ip)
2565	IF ( na_before_move <= 0 ) CYCLE
2566	agents_before_move => grid_agents(jp,ip)%agents(1:na_before_move)
2567
2568	DO n = 1, na_before_move
2569	i = agents_before_move(n)%x * ddx
2570	j = agents_before_move(n)%y * ddy
2571
2572	!-- For mas_eh_exchange_horiz to work properly agents need to be moved to the outermost
2573	!-- gridboxes of the respective processor.
2574	!-- If the agent index is inside the processor the following lines will not change the
2575	!-- index.
2576	i = MIN ( i , nxr )
2577	i = MAX ( i , nxl )
2578	j = MIN ( j , nyn )
2579	j = MAX ( j , nys )
2580
2581	!
2582	!-- Check if agent has moved to another grid cell.
2583	IF ( i /= ip .OR. j /= jp ) THEN
2584	!
2585	!-- If the agent stays on the same processor, the agent will be added to the agent
2586	!-- array of the new processor.
2587	number_of_agents = agt_count(j,i)
2588	agents => grid_agents(j,i)%agents(1:number_of_agents)
2589
2590	aindex = number_of_agents+1
2591	IF ( aindex > SIZE(grid_agents(j,i)%agents) ) THEN
2592	CALL mas_eh_realloc_agents_array(i,j)
2593	ENDIF
2594
2595	grid_agents(j,i)%agents(aindex) = agents_before_move(n)
2596	agt_count(j,i) = aindex
2597
2598	agents_before_move(n)%agent_mask = .FALSE.
2599	ENDIF
2600	ENDDO
2601
2602	ENDDO
2603	ENDDO
2604
2605	RETURN
2606
2607	END SUBROUTINE mas_eh_move_agent
2608
2609	!--------------------------------------------------------------------------------------------------!
2610	! Description:
2611	! ------------
2612	!> If the allocated memory for the agent array does not suffice to add arriving agents from
2613	!> neighbour grid cells, this subrouting reallocates the agent array to assure enough memory is
2614	!> available.
2615	!--------------------------------------------------------------------------------------------------!
2616	SUBROUTINE mas_eh_realloc_agents_array (i,j,size_in)
2617
2618	IMPLICIT NONE
2619
2620	INTEGER(iwp) :: new_size !< new array size
2621	INTEGER(iwp) :: old_size !< old array size
2622
2623	INTEGER(iwp), INTENT(in) :: i !< grid index (y)
2624	INTEGER(iwp), INTENT(in) :: j !< grid index (y)
2625
2626	INTEGER(iwp), INTENT(in), OPTIONAL :: size_in !< size of input array
2627
2628	TYPE(agent_type), DIMENSION(10) :: tmp_agents_s !< temporary static agent array
2629
2630	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: tmp_agents_d !< temporary dynamic agent array
2631
2632	old_size = SIZE(grid_agents(j,i)%agents)
2633
2634	IF ( PRESENT( size_in ) ) THEN
2635	new_size = size_in
2636	ELSE
2637	new_size = old_size * ( 1.0_wp + alloc_factor_mas / 100.0_wp )
2638	ENDIF
2639
2640	new_size = MAX( new_size, min_nr_agent, old_size + 1 )
2641
2642	IF ( old_size <= 10 ) THEN
2643
2644	tmp_agents_s(1:old_size) = grid_agents(j,i)%agents(1:old_size)
2645
2646	DEALLOCATE( grid_agents(j,i)%agents )
2647	ALLOCATE( grid_agents(j,i)%agents(new_size) )
2648
2649	grid_agents(j,i)%agents(1:old_size) = tmp_agents_s(1:old_size)
2650	grid_agents(j,i)%agents(old_size+1:new_size) = zero_agent
2651
2652	ELSE
2653
2654	ALLOCATE( tmp_agents_d(new_size) )
2655	tmp_agents_d(1:old_size) = grid_agents(j,i)%agents
2656
2657	DEALLOCATE( grid_agents(j,i)%agents )
2658	ALLOCATE( grid_agents(j,i)%agents(new_size) )
2659
2660	grid_agents(j,i)%agents(1:old_size) = tmp_agents_d(1:old_size)
2661	grid_agents(j,i)%agents(old_size+1:new_size) = zero_agent
2662
2663	DEALLOCATE( tmp_agents_d )
2664
2665	ENDIF
2666	agents => grid_agents(j,i)%agents(1:number_of_agents)
2667
2668	RETURN
2669	END SUBROUTINE mas_eh_realloc_agents_array
2670
2671	!--------------------------------------------------------------------------------------------------!
2672	! Description:
2673	! ------------
2674	!> Inquires prognostic model quantities at the position of each agent and stores them in that agent
2675	!> for later output
2676	!--------------------------------------------------------------------------------------------------!
2677	SUBROUTINE mas_get_prognostic_quantities
2678
2679	USE arrays_3d, &
2680	ONLY: exner, pt, u, v
2681
2682	IMPLICIT NONE
2683
2684	INTEGER(iwp) :: i_offset !< index offset for windspeed measurement
2685	INTEGER(iwp) :: il !< x-index
2686	INTEGER(iwp) :: is !< subgrid box counter
2687	INTEGER(iwp) :: j_offset !< index offset for windspeed measurement
2688	INTEGER(iwp) :: jl !< y-index
2689	INTEGER(iwp) :: kl !< z-index
2690	INTEGER(iwp) :: nl !< agent counter
2691	INTEGER(iwp) :: se !< subgrid box end index
2692	INTEGER(iwp) :: si !< subgrid box start index
2693
2694	REAL(wp) :: u_a !< windspeed at agent position (x)
2695	REAL(wp) :: v_a !< windspeed at agent position (y)
2696
2697	DO il = nxl, nxr
2698	DO jl = nys, nyn
2699
2700	number_of_agents = agt_count(jl,il)
2701	!
2702	!-- If grid cell is empty, cycle
2703	IF ( number_of_agents <= 0 ) CYCLE
2704	kl = s_measure_height(jl,il)
2705
2706	agents => grid_agents(jl,il)%agents(1:number_of_agents)
2707	!
2708	!-- Loop over the four subgrid boxes
2709	DO is = 0,3
2710	!
2711	!-- Set indices
2712	si = grid_agents(jl,il)%start_index(is)
2713	se = grid_agents(jl,il)%end_index(is)
2714	DO nl = si, se
2715	!
2716	!-- Calculate index offset in x-direction:
2717	!-- Left value if wall right of grid box
2718	!-- Right value if wall left of grid box
2719	!-- Else the one that is closer to the agent
2720	IF ( BTEST( obstacle_flags( jl, il+1 ), 6 ) ) THEN
2721	i_offset = 0
2722	ELSEIF ( BTEST( obstacle_flags( jl, il-1 ), 2 ) ) THEN
2723	i_offset = 1
2724	ELSE
2725	i_offset = MERGE( 0, 1, BTEST(is,1) )
2726	ENDIF
2727	u_a = u( kl, jl, il + i_offset )
2728	!
2729	!-- Calculate index offset in y-direction:
2730	!-- South value if wall north of grid box
2731	!-- North value if wall south of grid box
2732	!-- Else the one that is closer to the agent
2733	IF ( BTEST( obstacle_flags( jl+1, il ), 4 ) ) THEN
2734	j_offset = 0
2735	ELSEIF ( BTEST( obstacle_flags( jl-1, il ), 0 ) ) THEN
2736	j_offset = 1
2737	ELSE
2738	j_offset = MERGE( 0, 1, BTEST(is,0) )
2739	ENDIF
2740	v_a = v( kl, jl + j_offset, il )
2741	!
2742	!-- Calculate windspeed at agent postion
2743	agents(nl)%windspeed = SQRT(u_a2 + v_a2)
2744	!
2745	!-- Calculate temperature at agent position
2746	agents(nl)%t = pt(kl,jl,il) * exner(kl)
2747
2748	ENDDO
2749
2750	ENDDO
2751
2752	ENDDO
2753	ENDDO
2754
2755	END SUBROUTINE mas_get_prognostic_quantities
2756
2757	!--------------------------------------------------------------------------------------------------!
2758	! Description:
2759	! ------------
2760	!> Adds an item to the priority queue (binary heap) at the correct position
2761	!--------------------------------------------------------------------------------------------------!
2762	SUBROUTINE mas_heap_insert_item( id, priority )
2763
2764	IMPLICIT NONE
2765
2766	INTEGER(iwp) :: cur_pos !< current position
2767	INTEGER(iwp) :: id !< mesh ID of item
2768
2769	REAL(wp) :: priority !< item priority
2770
2771	TYPE(heap_item) :: item !< heap item
2772
2773	item%mesh_id = id
2774	item%priority = priority
2775	!
2776	!-- Extend heap, if necessary
2777	IF ( heap_count + 1 > SIZE( queue ) ) THEN
2778	CALL mas_heap_extend
2779	ENDIF
2780	!
2781	!-- Insert item at first unoccupied postion (highest index) of heap
2782	cur_pos = heap_count
2783	queue(cur_pos) = item
2784	!
2785	!-- Sort while inserted item is not at top of heap
2786	DO WHILE ( cur_pos /= 0 )
2787	!
2788	!-- If priority < its parent's priority, swap them.
2789	!-- Else, sorting is done.
2790	IF ( queue(cur_pos)%priority < queue(FLOOR( (cur_pos) / 2.0_wp ))%priority ) THEN
2791	item = queue(cur_pos)
2792	queue(cur_pos) = queue(FLOOR( ( cur_pos ) / 2.0_wp ))
2793	queue(FLOOR( ( cur_pos ) / 2.0_wp )) = item
2794	cur_pos = FLOOR( ( cur_pos ) / 2.0_wp )
2795	ELSE
2796	EXIT
2797	ENDIF
2798	ENDDO
2799	!
2800	!-- Item was added to heap, so the heap count increases
2801	heap_count = heap_count + 1
2802
2803	END SUBROUTINE mas_heap_insert_item
2804
2805	!--------------------------------------------------------------------------------------------------!
2806	! Description:
2807	! ------------
2808	!> Extends the size of the priority queue (binary heap)
2809	!--------------------------------------------------------------------------------------------------!
2810	SUBROUTINE mas_heap_extend
2811
2812	IMPLICIT NONE
2813
2814	INTEGER(iwp) :: soh !< size of heap
2815
2816	TYPE(heap_item), DIMENSION(:), ALLOCATABLE :: dummy_heap !< dummy heap
2817
2818	soh = SIZE( queue ) - 1
2819	ALLOCATE( dummy_heap(0:soh) )
2820	dummy_heap = queue
2821	DEALLOCATE( queue )
2822	ALLOCATE( queue(0:2*soh+1) )
2823	queue(0:soh) = dummy_heap(0:soh)
2824
2825	END SUBROUTINE mas_heap_extend
2826
2827	!--------------------------------------------------------------------------------------------------!
2828	! Description:
2829	! ------------
2830	!> Removes first (smallest) element from the priority queue, reorders the rest and returns the ID of
2831	!> the removed mesh point
2832	!--------------------------------------------------------------------------------------------------!
2833	SUBROUTINE mas_heap_extract_item ( id )
2834
2835	IMPLICIT NONE
2836
2837	INTEGER(iwp) :: child !< child of item in heap
2838	INTEGER(iwp) :: cur_pos !< current position of item in heap
2839	INTEGER(iwp) :: id !< ID of item extracted item
2840
2841	TYPE(heap_item) :: dummy
2842	!
2843	!-- Get ID of mesh point with lowest priority (extracted item: top of heap)
2844	id = queue(0)%mesh_id
2845	!
2846	!-- Put last item in heap at first position
2847	queue(0) = queue(heap_count-1)
2848	cur_pos = 0
2849	DO
2850	!
2851	!-- If current item has no children, sorting is done
2852	IF( 2*cur_pos+1 > heap_count - 1 ) THEN
2853	EXIT
2854	!
2855	!-- If current item has only one child, check if item and its child are ordered correctly. Else,
2856	!-- swap them.
2857	ELSEIF ( 2*cur_pos+2 > heap_count - 1 ) THEN
2858	IF ( queue(cur_pos)%priority > queue(2*cur_pos+1)%priority ) THEN
2859	dummy = queue(cur_pos)
2860	queue(cur_pos) = queue(2*cur_pos+1)
2861	queue(2*cur_pos+1) = dummy
2862	cur_pos = 2*cur_pos+1
2863	ELSE
2864	EXIT
2865	ENDIF
2866	ELSE
2867	!
2868	!-- Determine the smaller child
2869	IF ( queue(2cur_pos+1)%priority >= queue(2cur_pos+2)%priority ) THEN
2870	child = 2
2871	ELSE
2872	child = 1
2873	ENDIF
2874	!
2875	!-- Check if item and its smaller child are ordered falsely. If so, swap them. Else, sorting
2876	!-- is done.
2877	IF ( queue(cur_pos)%priority > queue(2*cur_pos+child )%priority ) THEN
2878	dummy = queue(cur_pos)
2879	queue(cur_pos) = queue(2*cur_pos+child)
2880	queue(2*cur_pos+child) = dummy
2881	cur_pos = 2*cur_pos+child
2882	ELSE
2883	EXIT
2884	ENDIF
2885	ENDIF
2886	ENDDO
2887	!
2888	!-- Top item was removed from heap, thus, heap_cout decreases by one
2889	heap_count = heap_count-1
2890
2891	END SUBROUTINE mas_heap_extract_item
2892
2893	!--------------------------------------------------------------------------------------------------!
2894	! Description:
2895	! ------------
2896	!> Initialization of Multi Agent System
2897	!--------------------------------------------------------------------------------------------------!
2898	SUBROUTINE mas_init
2899
2900	USE control_parameters, &
2901	ONLY: coupling_char, initializing_actions, io_blocks, io_group
2902
2903	USE arrays_3d, &
2904	ONLY: zu, zw
2905
2906	USE indices, &
2907	ONLY: nzt
2908
2909	IMPLICIT NONE
2910
2911	INTEGER(iwp) :: i !< grid cell (x)
2912	INTEGER(iwp) :: ii !< io-block counter
2913	INTEGER(iwp) :: il !< io-block counter
2914	INTEGER(iwp) :: ioerr !< IOSTAT flag for IO-commands ( 0 = no error )
2915	INTEGER(iwp) :: j !< grid cell (y)
2916	INTEGER(iwp) :: jl !< io-block counter
2917	INTEGER(iwp) :: kl !< io-block counter
2918	INTEGER(iwp) :: kdum !< io-block counter
2919	INTEGER(iwp) :: locdum !< io-block counter
2920	INTEGER(iwp) :: size_of_mesh !< temporary value for read
2921	INTEGER(iwp) :: size_of_pols !< temporary value for read
2922
2923	LOGICAL :: navigation_data_present !< Flag: check for input file
2924
2925	REAL(wp) :: zdum !< dummy for measurement height
2926	REAL(wp) :: avg_agt_height = 1.8_wp
2927
2928
2929	!
2930	!-- Check the number of agent groups.
2931	IF ( number_of_agent_groups > max_number_of_agent_groups ) THEN
2932	WRITE( message_string, * ) 'max_number_of_agent_groups =', max_number_of_agent_groups , &
2933	'&number_of_agent_groups reset to ', max_number_of_agent_groups
2934	CALL message( 'mas_init', 'PA0072', 0, 1, 0, 6, 0 )
2935	number_of_agent_groups = max_number_of_agent_groups
2936	ENDIF
2937
2938	!
2939	!-- Set some parameters
2940	d_sigma_rep_agent = 1.0_wp/sigma_rep_agent
2941	d_sigma_rep_wall = 1.0_wp/sigma_rep_wall
2942	d_tau_accel_agent = 1.0_wp/tau_accel_agent
2943	IF ( dt_agent /= 999.0_wp ) THEN
2944	agent_own_timestep = .TRUE.
2945	ENDIF
2946
2947	!
2948	!-- Get index of first grid box above topography
2949	ALLOCATE( top_top_s(nysg:nyng,nxlg:nxrg), &
2950	top_top_w(nysg:nyng,nxlg:nxrg), &
2951	s_measure_height(nys:nyn,nxl:nxr) )
2952	!
2953	!-- Get first index above topography for scalar grid and last index in topography for z-component of
2954	!-- wind.
2955	DO il = nxlg, nxrg
2956	DO jl = nysg, nyng
2957	top_top_s(jl,il) = topo_top_ind(jl,il,0) + 1
2958	top_top_w(jl,il) = topo_top_ind(jl,il,3)
2959	ENDDO
2960	ENDDO
2961	!
2962	!-- Create 2D array containing the index at which measurements are done by agents. The height of
2963	!-- this measurement is given by avg_agt_height.
2964	DO il = nxl, nxr
2965	DO jl = nys, nyn
2966
2967	kdum = top_top_w(jl,il)
2968	zdum = zw(kdum)
2969	zdum = zdum + avg_agt_height
2970	locdum = 0
2971	!
2972	!-- Locate minimum distance from u-grid to measurement height (zdum)
2973	DO kl = 1, nzt
2974	IF ( ABS(zu(kl)-zdum) < ABS(zu(locdum)-zdum) ) locdum = kl
2975	ENDDO
2976	s_measure_height(jl,il) = locdum
2977
2978	ENDDO
2979	ENDDO
2980
2981	CALL mas_create_obstacle_flags
2982
2983	!
2984	!-- Set default start positions, if necessary
2985	IF ( asl(1) == 9999999.9_wp ) asl(1) = 0.0_wp
2986	IF ( asr(1) == 9999999.9_wp ) asr(1) = ( nx + 1 ) * dx
2987	IF ( ass(1) == 9999999.9_wp ) ass(1) = 0.0_wp
2988	IF ( asn(1) == 9999999.9_wp ) asn(1) = ( ny + 1 ) * dy
2989	IF ( adx(1) == 9999999.9_wp .OR. adx(1) == 0.0_wp ) adx(1) = dx
2990	IF ( ady(1) == 9999999.9_wp .OR. ady(1) == 0.0_wp ) ady(1) = dy
2991
2992	DO j = 2, number_of_agent_groups
2993	IF ( asl(j) == 9999999.9_wp ) asl(j) = asl(j-1)
2994	IF ( asr(j) == 9999999.9_wp ) asr(j) = asr(j-1)
2995	IF ( ass(j) == 9999999.9_wp ) ass(j) = ass(j-1)
2996	IF ( asn(j) == 9999999.9_wp ) asn(j) = asn(j-1)
2997	IF ( adx(j) == 9999999.9_wp .OR. adx(j) == 0.0_wp ) adx(j) = adx(j-1)
2998	IF ( ady(j) == 9999999.9_wp .OR. ady(j) == 0.0_wp ) ady(j) = ady(j-1)
2999	ENDDO
3000
3001	!
3002	!-- Check boundary condition and set internal variables
3003	SELECT CASE ( bc_mas_lr )
3004
3005	CASE ( 'cyclic' )
3006	ibc_mas_lr = 0
3007
3008	CASE ( 'absorb' )
3009	ibc_mas_lr = 1
3010
3011	CASE DEFAULT
3012	WRITE( message_string, * ) 'unknown boundary condition ', &
3013	'bc_mas_lr = "', TRIM( bc_mas_lr ), '"'
3014	CALL message( 'mas_init', 'PA0073', 1, 2, 0, 6, 0 )
3015
3016	END SELECT
3017	SELECT CASE ( bc_mas_ns )
3018
3019	CASE ( 'cyclic' )
3020	ibc_mas_ns = 0
3021
3022	CASE ( 'absorb' )
3023	ibc_mas_ns = 1
3024
3025	CASE DEFAULT
3026	WRITE( message_string, * ) 'unknown boundary condition ', &
3027	'bc_mas_ns = "', TRIM( bc_mas_ns ), '"'
3028	CALL message( 'mas_init', 'PA0074', 1, 2, 0, 6, 0 )
3029
3030	END SELECT
3031
3032	!
3033	!-- For the first model run of a possible job chain initialize the agents, otherwise read the agent
3034	!-- data from restart file.
3035	IF ( TRIM( initializing_actions ) == 'read_restart_data' .AND. read_agents_from_restartfile )&
3036	THEN
3037
3038	! CALL mas_read_restart_file
3039
3040	ELSE
3041	!
3042	!-- Read preprocessed data of navigation mesh and building polygons for agent pathfinding
3043	DO ii = 0, io_blocks-1
3044	IF ( ii == io_group ) THEN
3045	!
3046	!-- Check for naviation input file and open it
3047	INQUIRE( FILE='NAVIGATION_DATA' // TRIM( coupling_char ), &
3048	EXIST=navigation_data_present )
3049	IF ( .NOT. navigation_data_present ) THEN
3050	message_string = 'Input file NAVIGATION_DATA' // &
3051	TRIM( coupling_char ) // ' for MAS missing. ' // &
3052	'&Please run agent_preprocessing before the job to create it.'
3053	CALL message( 'mas_init', 'PA0525', 1, 2, 0, 6, 0 )
3054	ENDIF
3055	OPEN ( 119, FILE='NAVIGATION_DATA'//TRIM( coupling_char ), FORM='UNFORMATTED', &
3056	IOSTAT=ioerr )
3057	!
3058	!-- Read mesh data
3059	READ( 119 ) size_of_mesh
3060	ALLOCATE( mesh(1:size_of_mesh) )
3061	DO i = 1, size_of_mesh
3062	READ( 119 ) mesh(i)%polygon_id, mesh(i)%vertex_id, &
3063	mesh(i)%noc, mesh(i)%origin_id, &
3064	mesh(i)%cost_so_far, mesh(i)%x, &
3065	mesh(i)%y, mesh(i)%x_s, mesh(i)%y_s
3066	ALLOCATE( mesh(i)%connected_vertices(1:mesh(i)%noc), &
3067	mesh(i)%distance_to_vertex(1:mesh(i)%noc) )
3068	DO j = 1, mesh(i)%noc
3069	READ( 119 ) mesh(i)%connected_vertices(j), &
3070	mesh(i)%distance_to_vertex(j)
3071	ENDDO
3072	ENDDO
3073	!
3074	!-- Read polygon data
3075	READ( 119 ) size_of_pols
3076	ALLOCATE( polygons(1:size_of_pols) )
3077	DO i = 1, size_of_pols
3078	READ( 119 ) polygons(i)%nov
3079	ALLOCATE( polygons(i)%vertices(0:polygons(i)%nov+1) )
3080	DO j = 0, polygons(i)%nov+1
3081	READ( 119 ) polygons(i)%vertices(j)%delete, &
3082	polygons(i)%vertices(j)%x, &
3083	polygons(i)%vertices(j)%y
3084	ENDDO
3085	ENDDO
3086	CLOSE(119)
3087
3088	ENDIF
3089	#if defined( __parallel ) && ! defined ( __check )
3090	CALL MPI_BARRIER( comm2d, ierr )
3091	#endif
3092	ENDDO
3093
3094	!
3095	!-- Allocate agent arrays and set attributes of the initial set of agents, which can be also
3096	!-- periodically released at later times.
3097	ALLOCATE( agt_count (nysg:nyng,nxlg:nxrg), &
3098	grid_agents(nysg:nyng,nxlg:nxrg) )
3099	!
3100	!-- Allocate dummy arrays for pathfinding
3101	ALLOCATE( dummy_path_x(0:agt_path_size), &
3102	dummy_path_y(0:agt_path_size) )
3103
3104	number_of_agents = 0
3105	sort_count_mas = 0
3106	agt_count = 0
3107
3108	!
3109	!-- Initialize counter for agent IDs
3110	grid_agents%id_counter = 1
3111
3112	!
3113	!-- Initialize all agents with dummy values (otherwise errors may occur within restart runs).
3114	!-- The reason for this is still not clear and may be presumably caused by errors in the
3115	!-- respective user-interface.
3116	zero_agent%agent_mask = .FALSE.
3117	zero_agent%block_nr = -1
3118	zero_agent%group = 0
3119	zero_agent%id = 0_idp
3120	zero_agent%path_counter = agt_path_size
3121	zero_agent%age = 0.0_wp
3122	zero_agent%age_m = 0.0_wp
3123	zero_agent%dt_sum = 0.0_wp
3124	zero_agent%clo = 0.0_wp
3125	zero_agent%energy_storage= 0.0_wp
3126	zero_agent%force_x = 0.0_wp
3127	zero_agent%force_y = 0.0_wp
3128	zero_agent%origin_x = 0.0_wp
3129	zero_agent%origin_y = 0.0_wp
3130	zero_agent%speed_abs = 0.0_wp
3131	zero_agent%speed_e_x = 0.0_wp
3132	zero_agent%speed_e_y = 0.0_wp
3133	zero_agent%speed_des = random_normal(desired_speed, des_sp_sig)
3134	zero_agent%speed_x = 0.0_wp
3135	zero_agent%speed_y = 0.0_wp
3136	zero_agent%ipt = 0.0_wp
3137	zero_agent%x = 0.0_wp
3138	zero_agent%y = 0.0_wp
3139	zero_agent%path_x = 0.0_wp
3140	zero_agent%path_y = 0.0_wp
3141	zero_agent%t_x = 0.0_wp
3142	zero_agent%t_y = 0.0_wp
3143
3144	!
3145	!-- Set a seed value for the random number generator to be exclusively used for the agent code.
3146	!-- The generated random numbers should be different on the different PEs.
3147	iran_agent = iran_agent + myid
3148
3149	CALL mas_create_agent( phase_init )
3150
3151	ENDIF
3152
3153	!
3154	!-- To avoid programm abort, assign agents array to the local version of first grid cell.
3155	number_of_agents = agt_count(nys,nxl)
3156	agents => grid_agents(nys,nxl)%agents(1:number_of_agents)
3157
3158	END SUBROUTINE mas_init
3159
3160	!--------------------------------------------------------------------------------------------------!
3161	! Description:
3162	! ------------
3163	!> Output of informative message about maximum agent number
3164	!--------------------------------------------------------------------------------------------------!
3165	SUBROUTINE mas_last_actions
3166
3167	USE control_parameters, &
3168	ONLY: message_string
3169
3170	IMPLICIT NONE
3171
3172	WRITE(message_string,'(A,I8,A)') 'The maximumn number of agents during this run was', &
3173	maximum_number_of_agents, &
3174	'&Consider adjusting the INPUT parameter'// &
3175	'&dim_size_agtnum_manual accordingly for the next run.'
3176
3177	CALL message( 'mas_data_output_agents', 'PA0457', 0, 0, 0, 6, 0 )
3178
3179	END SUBROUTINE mas_last_actions
3180
3181	!--------------------------------------------------------------------------------------------------!
3182	! Description:
3183	! ------------
3184	!> Finds the shortest path from a start position to a target position using the A*-algorithm
3185	!--------------------------------------------------------------------------------------------------!
3186	SUBROUTINE mas_nav_a_star( start_x, start_y, target_x, target_y, nsteps )
3187
3188	IMPLICIT NONE
3189
3190	INTEGER(iwp) :: cur_node !< current node of binary heap
3191	INTEGER(iwp) :: il !< counter (x)
3192	INTEGER(iwp) :: neigh_node !< neighbor node
3193	INTEGER(iwp) :: node_counter !< binary heap node counter
3194	INTEGER(iwp) :: nsteps !< number of steps
3195	INTEGER(iwp) :: path_ag !< index of agent path
3196	INTEGER(iwp) :: som !< size of mesh
3197	INTEGER(iwp) :: steps !< steps along the path
3198
3199	LOGICAL :: target_reached !< flag
3200
3201	REAL(wp) :: new_cost !< updated cost to reach node
3202	REAL(wp) :: new_priority !< priority of node to be added to queue
3203	REAL(wp) :: start_x !< x-coordinate agent
3204	REAL(wp) :: start_y !< y-coordinate agent
3205	REAL(wp) :: rn_gate !< random number for corner gate
3206	REAL(wp) :: target_x !< x-coordinate target
3207	REAL(wp) :: target_y !< y-coordinate target
3208	!
3209	!-- Coordinate Type
3210	TYPE coord
3211	REAL(wp) :: x !< x-coordinate
3212	REAL(wp) :: x_s !< x-coordinate (shifted)
3213	REAL(wp) :: y !< y-coordinate
3214	REAL(wp) :: y_s !< y-coordinate (shifted)
3215	END TYPE coord
3216
3217	TYPE(coord), DIMENSION(:), ALLOCATABLE, TARGET :: path !< path array
3218	TYPE(coord), DIMENSION(:), ALLOCATABLE, TARGET :: tmp_path !< temporary path for resizing
3219
3220	node_counter = 0
3221	!
3222	!-- Create temporary navigation mesh including agent and target positions
3223	CALL mas_nav_create_tmp_mesh( start_x, start_y, target_x, target_y, som )
3224	tmp_mesh(som)%cost_so_far = 0.0_wp
3225	!
3226	!-- Initialize priority queue
3227	heap_count = 0_iwp
3228	ALLOCATE( queue(0:100) )
3229	target_reached = .FALSE.
3230	!
3231	!-- Add starting point (agent position) to frontier (the frontier consists of all the nodes that
3232	!-- are to be visited. The node with the smallest priority will be visited first. The priority
3233	!-- consists of the distance from the start node to this node plus a minimal guess (direct
3234	!-- distance) from this node to the goal). For the starting node, the priority is set to 0, as it's
3235	!-- the only node thus far.
3236	CALL mas_heap_insert_item( som, 0.0_wp )
3237	cur_node = som
3238	DO WHILE ( heap_count > 0 )
3239	!
3240	!-- Step one: Pick lowest priority item from queue
3241	node_counter = node_counter + 1
3242	CALL mas_heap_extract_item(cur_node)
3243	!
3244	!-- Node 0 is the goal node
3245	IF ( cur_node == 0 ) THEN
3246	EXIT
3247	ENDIF
3248	!
3249	!-- Loop over all of cur_node's neighbors
3250	DO il = 1, tmp_mesh(cur_node)%noc
3251	neigh_node = tmp_mesh(cur_node)%connected_vertices(il)
3252	!
3253	!-- Check, if the way from the start node to this neigh_node via cur_node is shorter than the
3254	!-- previously found shortest path to it.
3255	!-- If so, replace said cost and add neigh_node to the frontier.
3256	!-- cost_so_far is initialized as 1.d12 so that all found distances should be smaller.
3257	new_cost = tmp_mesh(cur_node)%cost_so_far + tmp_mesh(cur_node)%distance_to_vertex(il)
3258	IF ( new_cost < tmp_mesh(neigh_node)%cost_so_far ) THEN
3259	tmp_mesh(neigh_node)%cost_so_far = new_cost
3260	tmp_mesh(neigh_node)%origin_id = cur_node
3261	!
3262	!-- Priority in the queue is cost_so_far + heuristic to goal
3263	new_priority = new_cost &
3264	+ heuristic(tmp_mesh(neigh_node)%x, &
3265	tmp_mesh(neigh_node)%y, tmp_mesh(0)%x, &
3266	tmp_mesh(0)%y)
3267	CALL mas_heap_insert_item(neigh_node,new_priority)
3268	ENDIF
3269	ENDDO
3270	ENDDO
3271	!
3272	!-- Add nodes to a path array. To do this, we must backtrack from the target node to its origin and
3273	!-- so on until a node is reached that has no origin (%origin_id == -1). This is the starting node.
3274	DEALLOCATE( queue )
3275	cur_node = 0
3276	steps = 0
3277	ALLOCATE( path(1:100) )
3278	DO WHILE ( cur_node /= -1 )
3279	steps = steps + 1
3280	!
3281	!-- Resize path array if necessary
3282	IF ( steps > SIZE(path) ) THEN
3283	ALLOCATE( tmp_path(1:steps-1) )
3284	tmp_path(1:steps-1) = path(1:steps-1)
3285	DEALLOCATE( path )
3286	ALLOCATE( path(1:2*(steps-1)) )
3287	path(1:steps-1) = tmp_path(1:steps-1)
3288	DEALLOCATE( tmp_path )
3289	ENDIF
3290	path(steps)%x = tmp_mesh(cur_node)%x
3291	path(steps)%y = tmp_mesh(cur_node)%y
3292	path(steps)%x_s = tmp_mesh(cur_node)%x_s
3293	path(steps)%y_s = tmp_mesh(cur_node)%y_s
3294	cur_node = tmp_mesh(cur_node)%origin_id
3295	ENDDO
3296	!
3297	!-- Add calculated intermittent targets to the path until either the target or the maximum number of
3298	!-- intermittent targets is reached.
3299	!-- Ignore starting point (reduce index by one), it is agent position.
3300	dummy_path_x = -1
3301	dummy_path_y = -1
3302	path_ag = 1
3303	steps = steps - 1
3304	nsteps = 0
3305	DO WHILE( steps > 0 .AND. path_ag <= agt_path_size )
3306	!
3307	!-- Each target point is randomly chosen along a line target along the bisector of the building
3308	!-- corner that starts at corner_gate_start and has a width of corner_gate_width. This is to
3309	!-- avoid clustering when opposing agent groups try to reach the same corner target.
3310	rn_gate = random_function(iran_agent) * corner_gate_width + corner_gate_start
3311	dummy_path_x(path_ag) = path(steps)%x + rn_gate * (path(steps)%x_s - path(steps)%x)
3312	dummy_path_y(path_ag) = path(steps)%y + rn_gate * (path(steps)%y_s - path(steps)%y)
3313	steps = steps - 1
3314	path_ag = path_ag + 1
3315	nsteps = nsteps + 1
3316	ENDDO
3317	!
3318	!-- Set current intermittent target of this agent
3319	DEALLOCATE( tmp_mesh, path )
3320
3321	END SUBROUTINE mas_nav_a_star
3322
3323	!--------------------------------------------------------------------------------------------------!
3324	! Description:
3325	! ------------
3326	!> Adds a connection between two points of the navigation mesh (one-way: in_mp1 to in_mp2)
3327	!--------------------------------------------------------------------------------------------------!
3328	SUBROUTINE mas_nav_add_connection ( in_mp1, id2, in_mp2 )
3329
3330	IMPLICIT NONE
3331
3332	LOGICAL :: connection_established !< Flag to indicate if connection has already been established
3333
3334	INTEGER(iwp) :: id2 !< ID of in_mp2
3335	INTEGER(iwp) :: il !< local counter
3336	INTEGER(iwp) :: noc1 !< number of connections in in_mp1
3337
3338	INTEGER, DIMENSION(:), ALLOCATABLE :: dum_cv !< dummy array for connected_vertices
3339
3340	REAL(wp) :: dist !< Distance between the two points
3341
3342	REAL(wp), DIMENSION(:), ALLOCATABLE :: dum_dtv
3343
3344	TYPE(mesh_point) :: in_mp1 !< mesh point that gets a new connection
3345	TYPE(mesh_point) :: in_mp2 !< mesh point in_mp1 will be connected to
3346
3347	connection_established = .FALSE.
3348	!
3349	!-- Check if connection has already been established
3350	noc1 = SIZE( in_mp1%connected_vertices )
3351	DO il = 1, in_mp1%noc
3352	IF ( in_mp1%connected_vertices(il) == id2 ) THEN
3353	connection_established = .TRUE.
3354	EXIT
3355	ENDIF
3356	ENDDO
3357
3358	IF ( .NOT. connection_established ) THEN
3359	!
3360	!-- Resize arrays, if necessary
3361	IF ( in_mp1%noc >= noc1 ) THEN
3362	ALLOCATE( dum_cv(1:noc1),dum_dtv(1:noc1) )
3363	dum_cv = in_mp1%connected_vertices
3364	dum_dtv = in_mp1%distance_to_vertex
3365	DEALLOCATE( in_mp1%connected_vertices, in_mp1%distance_to_vertex )
3366	ALLOCATE( in_mp1%connected_vertices(1:2*noc1), &
3367	in_mp1%distance_to_vertex(1:2*noc1) )
3368	in_mp1%connected_vertices = -999
3369	in_mp1%distance_to_vertex = -999.
3370	in_mp1%connected_vertices(1:noc1) = dum_cv
3371	in_mp1%distance_to_vertex(1:noc1) = dum_dtv
3372	ENDIF
3373
3374	!
3375	!-- Add connection
3376	in_mp1%noc = in_mp1%noc+1
3377	dist = SQRT( (in_mp1%x - in_mp2%x)2 + (in_mp1%y - in_mp2%y)2 )
3378	in_mp1%connected_vertices(in_mp1%noc) = id2
3379	in_mp1%distance_to_vertex(in_mp1%noc) = dist
3380	ENDIF
3381
3382	END SUBROUTINE mas_nav_add_connection
3383
3384	!--------------------------------------------------------------------------------------------------!
3385	! Description:
3386	! ------------
3387	!> Adds a vertex (curren position of agent or target) to the existing tmp_mesh
3388	!--------------------------------------------------------------------------------------------------!
3389	SUBROUTINE mas_nav_add_vertex_to_mesh ( in_mp, in_id )
3390
3391	IMPLICIT NONE
3392
3393
3394	INTEGER(iwp) :: in_id !< vertex id of tested mesh point
3395	INTEGER(iwp) :: jl !< mesh point counter
3396	INTEGER(iwp) :: pl !< polygon counter
3397	INTEGER(iwp) :: vl !< vertex counter
3398	INTEGER(iwp) :: pid_t !< polygon id of tested mesh point
3399	INTEGER(iwp) :: vid_t !< vertex id of tested mesh point
3400
3401	LOGICAL :: intersection_found !< flag
3402	LOGICAL :: is_left_n !< local switch
3403	LOGICAL :: is_left_p !< local switch
3404	LOGICAL :: is_right_n !< local switch
3405	LOGICAL :: is_right_p !< local switch
3406
3407	REAL(wp) :: v1x !< x-coordinate of test vertex 1 for intersection test
3408	REAL(wp) :: v1y !< y-coordinate of test vertex 1 for intersection test
3409	REAL(wp) :: v2x !< x-coordinate of test vertex 2 for intersection test
3410	REAL(wp) :: v2y !< y-coordinate of test vertex 2 for intersection test
3411	REAL(wp) :: x !< x-coordinate of current mesh point
3412	REAL(wp) :: x_t !< x-coordinate of tested mesh point
3413	REAL(wp) :: y !< y-coordinate of current mesh point
3414	REAL(wp) :: y_t !< y-coordinate of tested mesh point
3415
3416	TYPE(mesh_point) :: in_mp !< Input mesh point
3417	!
3418	!--
3419	x = in_mp%x
3420	y = in_mp%y
3421	DO jl = 0, SIZE( tmp_mesh )-2
3422	IF ( in_id == jl ) CYCLE
3423	!
3424	!-- Ignore mesh points with 0 connections
3425	IF ( tmp_mesh(jl)%polygon_id /= -1 ) THEN
3426	IF ( tmp_mesh(jl)%noc == 0 ) CYCLE
3427	ENDIF
3428	x_t = tmp_mesh(jl)%x
3429	y_t = tmp_mesh(jl)%y
3430	pid_t = tmp_mesh(jl)%polygon_id
3431	vid_t = tmp_mesh(jl)%vertex_id
3432	!
3433	!-- If the connecting line between the target and a mesh point points into the mesh point's
3434	!-- polygon, no connection will be established between the two points. This is the case if the
3435	!-- previous (next, n) vertex of the polygon is right of the connecting line and the next
3436	!-- (previous, p) vertex of the polygon is left of the connecting line.
3437	IF ( pid_t > 0 .AND. pid_t <= SIZE( polygons ) ) THEN
3438	is_left_p = is_left( x, y, x_t, y_t, polygons(pid_t)%vertices(vid_t-1)%x, &
3439	polygons(pid_t)%vertices(vid_t-1)%y )
3440	is_left_n = is_left( x, y, x_t, y_t, polygons(pid_t)%vertices(vid_t+1)%x, &
3441	polygons(pid_t)%vertices(vid_t+1)%y )
3442	is_right_p = is_right( x, y, x_t, y_t, polygons(pid_t)%vertices(vid_t-1)%x, &
3443	polygons(pid_t)%vertices(vid_t-1)%y )
3444	is_right_n = is_right( x, y, x_t, y_t, polygons(pid_t)%vertices(vid_t+1)%x, &
3445	polygons(pid_t)%vertices(vid_t+1)%y )
3446	IF ( ( is_left_p .AND. is_right_n ) .OR. ( is_right_p .AND. is_left_n ) ) CYCLE
3447	ENDIF
3448	!
3449	!-- For each edge of each polygon, check if it intersects with the potential connection. If at
3450	!-- least one intersection is found, no connection can be made.
3451	intersection_found = .FALSE.
3452	DO pl = 1, SIZE( polygons )
3453	DO vl = 1, polygons(pl)%nov
3454	v1x = polygons(pl)%vertices(vl)%x
3455	v1y = polygons(pl)%vertices(vl)%y
3456	v2x = polygons(pl)%vertices(vl+1)%x
3457	v2y = polygons(pl)%vertices(vl+1)%y
3458	intersection_found = intersect(x,y,x_t,y_t,v1x,v1y,v2x,v2y)
3459	IF ( intersection_found ) THEN
3460	EXIT
3461	ENDIF
3462	ENDDO
3463	IF ( intersection_found ) EXIT
3464	ENDDO
3465	IF ( intersection_found ) CYCLE
3466	!
3467	!-- If neither of the above two tests was true, a connection will be established between the two
3468	!-- mesh points.
3469	CALL mas_nav_add_connection(in_mp,jl, tmp_mesh(jl))
3470	CALL mas_nav_add_connection(tmp_mesh(jl),in_id, in_mp)
3471	ENDDO
3472	CALL mas_nav_reduce_connections(in_mp)
3473
3474	END SUBROUTINE mas_nav_add_vertex_to_mesh
3475
3476	!--------------------------------------------------------------------------------------------------!
3477	! Description:
3478	! ------------
3479	!> Creates a temporary copy of the navigation mesh to be used for pathfinding
3480	!--------------------------------------------------------------------------------------------------!
3481	SUBROUTINE mas_nav_create_tmp_mesh( a_x, a_y, t_x, t_y, som )
3482
3483	IMPLICIT NONE
3484
3485	INTEGER(iwp) :: im !< local mesh point counter
3486	INTEGER(iwp) :: noc !< number of connetions
3487	INTEGER(iwp) :: som !< size of mesh
3488
3489	REAL(wp) :: a_x !< x-coordinate agent
3490	REAL(wp) :: a_y !< y-coordinate agent
3491	REAL(wp) :: t_x !< x-coordinate target
3492	REAL(wp) :: t_y !< y-coordinate target
3493	!
3494	!-- Give tmp_mesh the size of mesh
3495	som = SIZE( mesh ) + 1
3496	ALLOCATE( tmp_mesh(0:som) )
3497	!
3498	!-- Give the allocatable variables in tmp_mesh their respctive sizes
3499	DO im = 1, som-1
3500	noc = mesh(im)%noc
3501	ALLOCATE( tmp_mesh(im)%connected_vertices(1:noc) )
3502	ALLOCATE( tmp_mesh(im)%distance_to_vertex(1:noc) )
3503	ENDDO
3504	!
3505	!-- Copy mesh to tmp_mesh
3506	tmp_mesh(1:som-1) = mesh(1:som-1)
3507	!
3508	!-- Add target point ...
3509	CALL mas_nav_init_mesh_point(tmp_mesh(0),-1_iwp,-1_iwp,t_x, t_y)
3510	CALL mas_nav_add_vertex_to_mesh(tmp_mesh(0),0_iwp)
3511	!
3512	!-- ... and start point to temp mesh
3513	CALL mas_nav_init_mesh_point(tmp_mesh(som),-1_iwp,-1_iwp,a_x, a_y)
3514	CALL mas_nav_add_vertex_to_mesh(tmp_mesh(som),som)
3515
3516	END SUBROUTINE mas_nav_create_tmp_mesh
3517
3518
3519	!--------------------------------------------------------------------------------------------------!
3520	! Description:
3521	! ------------
3522	!> Finds the shortest path from an agents' position to her target. As the actual pathfinding
3523	!> algorithm uses the obstacle corners and then shifts them outward after pathfinding, cases can
3524	!> occur in which the connection between these intermittent targets then intersect with obstacles.
3525	!> To remedy this the pathfinding algorithm is then run on every two subsequent intermittent targets
3526	!> iteratively and new intermittent targets may be added to the path this way.
3527	!--------------------------------------------------------------------------------------------------!
3528	SUBROUTINE mas_nav_find_path( nl )
3529
3530	IMPLICIT NONE
3531
3532	INTEGER(iwp) :: il !< local counter
3533	INTEGER(iwp) :: jl !< local counter
3534	INTEGER(iwp) :: kl !< local counter
3535	INTEGER(iwp) :: nl !< local agent counter
3536	INTEGER(iwp) :: nsteps_dummy !< number of steps on path
3537	INTEGER(iwp) :: nsteps_total !< number of steps on path
3538
3539	REAL(wp), DIMENSION(0:30) :: ld_path_x !< local dummy agent path to target (x)
3540	REAL(wp), DIMENSION(0:30) :: ld_path_y !< local dummy agent path to target (y)
3541	!
3542	!-- Initialize agent path arrays
3543	agents(nl)%path_x = -1
3544	agents(nl)%path_y = -1
3545	agents(nl)%path_x(0) = agents(nl)%x
3546	agents(nl)%path_y(0) = agents(nl)%y
3547	!
3548	!-- Calculate initial path
3549	CALL mas_nav_a_star( agents(nl)%x, agents(nl)%y, agents(nl)%t_x, agents(nl)%t_y, nsteps_total )
3550	!
3551	!-- Set the rest of the agent path that was just calculated
3552	agents(nl)%path_x(1:nsteps_total) = dummy_path_x(1:nsteps_total)
3553	agents(nl)%path_y(1:nsteps_total) = dummy_path_y(1:nsteps_total)
3554	!
3555	!-- Iterate through found path and check more intermittent targets need to be added. For this, run
3556	!-- pathfinding between every two consecutive intermittent targets.
3557	DO il = 0, MIN( agt_path_size-1, nsteps_total-1 )
3558	!
3559	!-- Pathfinding between two consecutive intermittent targets
3560	CALL mas_nav_a_star( agents(nl)%path_x(il), agents(nl)%path_y(il), &
3561	agents(nl)%path_x(il+1), agents(nl)%path_y(il+1), &
3562	nsteps_dummy )
3563	nsteps_dummy = nsteps_dummy - 1
3564	!
3565	!-- If additional intermittent targets are found, add them to the path
3566	IF ( nsteps_dummy > 0 ) THEN
3567	ld_path_x = -1
3568	ld_path_y = -1
3569	ld_path_x(il+1:il+nsteps_dummy) = dummy_path_x(1:nsteps_dummy)
3570	ld_path_y(il+1:il+nsteps_dummy) = dummy_path_y(1:nsteps_dummy)
3571	kl = 1
3572	DO jl = il+1,nsteps_total
3573	ld_path_x( il+nsteps_dummy+kl ) = agents(nl)%path_x(jl)
3574	ld_path_y( il+nsteps_dummy+kl ) = agents(nl)%path_y(jl)
3575	kl = kl + 1
3576	IF ( kl > agt_path_size ) EXIT
3577	ENDDO
3578	nsteps_total = MIN( nsteps_total + nsteps_dummy, agt_path_size )
3579	agents(nl)%path_x(il+1:nsteps_total) = ld_path_x(il+1:nsteps_total)
3580	agents(nl)%path_y(il+1:nsteps_total) = ld_path_y(il+1:nsteps_total)
3581	ENDIF
3582
3583	ENDDO
3584	!
3585	!-- Reset path counter to first intermittent target
3586	agents(nl)%path_counter = 1
3587
3588	END SUBROUTINE mas_nav_find_path
3589
3590	!--------------------------------------------------------------------------------------------------!
3591	! Description:
3592	! ------------
3593	!> Reduces the size of connection array to the amount of actual connections after all connetions
3594	!> were added to a mesh point
3595	!--------------------------------------------------------------------------------------------------!
3596	SUBROUTINE mas_nav_reduce_connections ( in_mp )
3597
3598	IMPLICIT NONE
3599
3600	INTEGER(iwp) :: noc !< number of connections
3601
3602	INTEGER, DIMENSION(:), ALLOCATABLE :: dum_cv !< dummy connected_vertices
3603
3604	REAL(wp), DIMENSION(:), ALLOCATABLE :: dum_dtv !< dummy distance_to_vertex
3605
3606	TYPE(mesh_point) :: in_mp
3607
3608	noc = in_mp%noc
3609	ALLOCATE( dum_cv(1:noc),dum_dtv(1:noc) )
3610	dum_cv = in_mp%connected_vertices(1:noc)
3611	dum_dtv = in_mp%distance_to_vertex(1:noc)
3612	DEALLOCATE( in_mp%connected_vertices, in_mp%distance_to_vertex )
3613	ALLOCATE( in_mp%connected_vertices(1:noc), &
3614	in_mp%distance_to_vertex(1:noc) )
3615	in_mp%connected_vertices(1:noc) = dum_cv(1:noc)
3616	in_mp%distance_to_vertex(1:noc) = dum_dtv(1:noc)
3617
3618	END SUBROUTINE mas_nav_reduce_connections
3619
3620	!--------------------------------------------------------------------------------------------------!
3621	! Description:
3622	! ------------
3623	!> Initializes a point of the navigation mesh
3624	!--------------------------------------------------------------------------------------------------!
3625	SUBROUTINE mas_nav_init_mesh_point ( in_mp, pid, vid, x, y )
3626
3627	IMPLICIT NONE
3628
3629	INTEGER(iwp) :: pid !< polygon ID
3630	INTEGER(iwp) :: vid !< vertex ID
3631
3632	REAL(wp) :: x !< x-coordinate
3633	REAL(wp) :: y !< y-coordinate
3634
3635	TYPE(mesh_point) :: in_mp !< mesh point to be initialized
3636
3637	in_mp%origin_id = -1
3638	in_mp%polygon_id = pid
3639	in_mp%vertex_id = vid
3640	in_mp%cost_so_far = 1.d12
3641	in_mp%x = x
3642	in_mp%y = y
3643	in_mp%x_s = x
3644	in_mp%y_s = y
3645	ALLOCATE( in_mp%connected_vertices(1:100), &
3646	in_mp%distance_to_vertex(1:100) )
3647	in_mp%connected_vertices = -999
3648	in_mp%distance_to_vertex = -999.
3649	in_mp%noc = 0
3650
3651	END SUBROUTINE mas_nav_init_mesh_point
3652
3653	!--------------------------------------------------------------------------------------------------!
3654	! Description:
3655	! ------------
3656	!> Reading of namlist from parin file
3657	!--------------------------------------------------------------------------------------------------!
3658	SUBROUTINE mas_parin
3659
3660	USE control_parameters, &
3661	ONLY: agent_time_unlimited, multi_agent_system_end, multi_agent_system_start
3662
3663	IMPLICIT NONE
3664
3665	CHARACTER(LEN=100) :: line !< dummy string for current line in namelist file
3666
3667	INTEGER(iwp) :: io_status !< status after reading the namelist file
3668
3669	LOGICAL :: switch_off_module = .FALSE. !< local namelist parameter to switch off the module
3670	!< although the respective module namelist appears in
3671	!< the namelist file
3672
3673	NAMELIST /agent_parameters/ a_rand_target, &
3674	adx, &
3675	ady, &
3676	agent_maximum_age, &
3677	agent_time_unlimited, &
3678	alloc_factor_mas, &
3679	asl, &
3680	asn, &
3681	asr, &
3682	ass, &
3683	at_x, &
3684	at_y, &
3685	bc_mas_lr, &
3686	bc_mas_ns, &
3687	coll_t_0, &
3688	corner_gate_start, &
3689	corner_gate_width, &
3690	deallocate_memory_mas, &
3691	dim_size_agtnum_manual, &
3692	dim_size_factor_agtnum, &
3693	dist_to_int_target, &
3694	dt_agent, &
3695	dt_arel, &
3696	dt_write_agent_data, &
3697	end_time_arel, &
3698	max_dist_from_path, &
3699	min_nr_agent, &
3700	multi_agent_system_end, &
3701	multi_agent_system_start, &
3702	number_of_agent_groups, &
3703	radius_agent, &
3704	random_start_position_agents, &
3705	read_agents_from_restartfile, &
3706	repuls_agent, &
3707	repuls_wall, &
3708	scan_radius_agent, &
3709	sigma_rep_agent, &
3710	sigma_rep_wall, &
3711	step_dealloc_mas, &
3712	switch_off_module, &
3713	tau_accel_agent
3714
3715	!
3716	!-- Move to the beginning of the namelist file and try to find and read the namelist.
3717	REWIND ( 11 )
3718	READ ( 11, agent_parameters, IOSTAT=io_status )
3719
3720	!
3721	!-- Action depending on the READ status
3722	IF ( io_status == 0 ) THEN
3723	!
3724	!-- agent_parameters namelist was found and read correctly. Set flag that indicates that agents
3725	!-- are switched on.
3726	IF ( .NOT. switch_off_module ) agents_active = .TRUE.
3727
3728	ELSEIF ( io_status > 0 ) THEN
3729	!
3730	!-- agent_parameters namelist was found but contained errors. Print an error message including
3731	!-- the line that caused the problem.
3732	BACKSPACE( 11 )
3733	READ( 11 , '(A)') line
3734	CALL parin_fail_message( 'agent_parameters', line )
3735
3736	ENDIF
3737
3738	END SUBROUTINE mas_parin
3739
3740	!--------------------------------------------------------------------------------------------------!
3741	! Description:
3742	! ------------
3743	!> Routine for the whole processor
3744	!> Sort all agents into the 4 respective subgrid boxes
3745	!--------------------------------------------------------------------------------------------------!
3746	SUBROUTINE mas_ps_sort_in_subboxes
3747
3748	IMPLICIT NONE
3749
3750	INTEGER(iwp) :: i !< grid box (x)
3751	INTEGER(iwp) :: ip !< counter (x)
3752	INTEGER(iwp) :: is !< box counter
3753	INTEGER(iwp) :: j !< grid box (y)
3754	INTEGER(iwp) :: jp !< counter (y)
3755	INTEGER(iwp) :: m !< sorting index
3756	INTEGER(iwp) :: n !< agent index
3757	INTEGER(iwp) :: nn !< agent counter
3758	INTEGER(iwp) :: sort_index !< sorting index
3759
3760	INTEGER(iwp), DIMENSION(0:3) :: sort_count !< number of agents in one subbox
3761
3762	TYPE(agent_type), DIMENSION(:,:), ALLOCATABLE :: sort_agents !< sorted agent array
3763
3764	DO ip = nxl, nxr
3765	DO jp = nys, nyn
3766	number_of_agents = agt_count(jp,ip)
3767	IF ( number_of_agents <= 0 ) CYCLE
3768	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
3769
3770	nn = 0
3771	sort_count = 0
3772	ALLOCATE( sort_agents(number_of_agents, 0:3) )
3773
3774	DO n = 1, number_of_agents
3775	sort_index = 0
3776
3777	IF ( agents(n)%agent_mask ) THEN
3778	nn = nn + 1
3779	!
3780	!-- Sorting agents with a binary scheme
3781	!-- sort_index=11_2=3_10 -> agent at the left,south subgridbox
3782	!-- sort_index=10_2=2_10 -> agent at the left,north subgridbox
3783	!-- sort_index=01_2=1_10 -> agent at the right,south subgridbox
3784	!-- sort_index=00_2=0_10 -> agent at the right,north subgridbox
3785	!-- For this the center of the gridbox is calculated
3786	i = (agents(n)%x + 0.5_wp * dx) * ddx
3787	j = (agents(n)%y + 0.5_wp * dy) * ddy
3788
3789	IF ( i == ip ) sort_index = sort_index + 2
3790	IF ( j == jp ) sort_index = sort_index + 1
3791
3792	sort_count(sort_index) = sort_count(sort_index) + 1
3793	m = sort_count(sort_index)
3794	sort_agents(m,sort_index) = agents(n)
3795	sort_agents(m,sort_index)%block_nr = sort_index
3796	ENDIF
3797	ENDDO
3798
3799	nn = 0
3800	DO is = 0,3
3801	grid_agents(jp,ip)%start_index(is) = nn + 1
3802	DO n = 1,sort_count(is)
3803	nn = nn + 1
3804	agents(nn) = sort_agents(n,is)
3805	ENDDO
3806	grid_agents(jp,ip)%end_index(is) = nn
3807	ENDDO
3808
3809	number_of_agents = nn
3810	agt_count(jp,ip) = number_of_agents
3811	DEALLOCATE( sort_agents )
3812	ENDDO
3813	ENDDO
3814
3815	END SUBROUTINE mas_ps_sort_in_subboxes
3816
3817	#if defined( __parallel )
3818	!--------------------------------------------------------------------------------------------------!
3819	! Description:
3820	! ------------
3821	!> Move all agents not marked for deletion to lowest indices (packing)
3822	!--------------------------------------------------------------------------------------------------!
3823	SUBROUTINE mas_ps_pack
3824
3825	IMPLICIT NONE
3826
3827	INTEGER(iwp) :: n !< agent counter
3828	INTEGER(iwp) :: nn !< number of agents
3829	!
3830	!-- Find out elements marked for deletion and move data from highest index values to these free
3831	!-- indices.
3832	nn = number_of_agents
3833
3834	DO WHILE ( .NOT. agents(nn)%agent_mask )
3835	nn = nn-1
3836	IF ( nn == 0 ) EXIT
3837	ENDDO
3838
3839	IF ( nn > 0 ) THEN
3840	DO n = 1, number_of_agents
3841	IF ( .NOT. agents(n)%agent_mask ) THEN
3842	agents(n) = agents(nn)
3843	nn = nn - 1
3844	DO WHILE ( .NOT. agents(nn)%agent_mask )
3845	nn = nn-1
3846	IF ( n == nn ) EXIT
3847	ENDDO
3848	ENDIF
3849	IF ( n == nn ) EXIT
3850	ENDDO
3851	ENDIF
3852
3853	!
3854	!-- The number of deleted agents has been determined in routines mas_boundary_conds,
3855	!-- mas_droplet_collision, and mas_eh_exchange_horiz.
3856	number_of_agents = nn
3857
3858	END SUBROUTINE mas_ps_pack
3859	#endif
3860
3861	!--------------------------------------------------------------------------------------------------!
3862	! Description:
3863	! ------------
3864	!> Sort agents in each sub-grid box into two groups: agents that already completed the LES
3865	!> timestep, and agents that need further timestepping to complete the LES timestep.
3866	!--------------------------------------------------------------------------------------------------!
3867	! SUBROUTINE mas_ps_sort_timeloop_done
3868	!
3869	! IMPLICIT NONE
3870	!
3871	! INTEGER(iwp) :: end_index !< agent end index for each sub-box
3872	! INTEGER(iwp) :: i !< index of agent grid box in x-direction
3873	! INTEGER(iwp) :: j !< index of agent grid box in y-direction
3874	! INTEGER(iwp) :: n !< running index for number of agents
3875	! INTEGER(iwp) :: nb !< index of subgrid boux
3876	! INTEGER(iwp) :: nf !< indices for agents in each sub-box that already finalized their substeps
3877	! INTEGER(iwp) :: nnf !< indices for agents in each sub-box that need further treatment
3878	! INTEGER(iwp) :: num_finalized !< number of agents in each sub-box that already finalized their substeps
3879	! INTEGER(iwp) :: start_index !< agent start index for each sub-box
3880	!
3881	! TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: sort_agents !< temporary agent array
3882	!
3883	! DO i = nxl, nxr
3884	! DO j = nys, nyn
3885	!
3886	! number_of_agents = agt_count(j,i)
3887	! IF ( number_of_agents <= 0 ) CYCLE
3888	!
3889	! agents => grid_agents(j,i)%agents(1:number_of_agents)
3890	!
3891	! DO nb = 0, 3
3892	!
3893	!-- Obtain start and end index for each subgrid box
3894	! start_index = grid_agents(j,i)%start_index(nb)
3895	! end_index = grid_agents(j,i)%end_index(nb)
3896	!
3897	!-- Allocate temporary array used for sorting
3898	! ALLOCATE( sort_agents(start_index:end_index) )
3899	!
3900	!-- Determine number of agents already completed the LES
3901	!-- timestep, and write them into a temporary array
3902	! nf = start_index
3903	! num_finalized = 0
3904	! DO n = start_index, end_index
3905	! IF ( dt_3d - agents(n)%dt_sum < 1E-8_wp ) THEN
3906	! sort_agents(nf) = agents(n)
3907	! nf = nf + 1
3908	! num_finalized = num_finalized + 1
3909	! ENDIF
3910	! ENDDO
3911	!
3912	!-- Determine number of agents that not completed the LES
3913	!-- timestep, and write them into a temporary array
3914	! nnf = nf
3915	! DO n = start_index, end_index
3916	! IF ( dt_3d - agents(n)%dt_sum > 1E-8_wp ) THEN
3917	! sort_agents(nnf) = agents(n)
3918	! nnf = nnf + 1
3919	! ENDIF
3920	! ENDDO
3921	!
3922	!-- Write back sorted agents
3923	! agents(start_index:end_index) = &
3924	! sort_agents(start_index:end_index)
3925	!
3926	!-- Determine updated start_index, used to masked already
3927	!-- completed agents.
3928	! grid_agents(j,i)%start_index(nb) = &
3929	! grid_agents(j,i)%start_index(nb) &
3930	! + num_finalized
3931	!
3932	!-- Deallocate dummy array
3933	! DEALLOCATE ( sort_agents )
3934	!
3935	!-- Finally, if number of non-completed agents is non zero
3936	!-- in any of the sub-boxes, set control flag appropriately.
3937	! IF ( nnf > nf ) &
3938	! grid_agents(j,i)%time_loop_done = .FALSE.
3939	!
3940	! ENDDO
3941	! ENDDO
3942	! ENDDO
3943	!
3944	! END SUBROUTINE mas_ps_sort_timeloop_done
3945
3946	!--------------------------------------------------------------------------------------------------!
3947	! Description:
3948	! ------------
3949	!> Calls social forces calculations
3950	!--------------------------------------------------------------------------------------------------!
3951	SUBROUTINE mas_timestep_forces_call ( ip, jp )
3952
3953	IMPLICIT NONE
3954
3955	INTEGER(iwp) :: ip !< counter, x-direction
3956	INTEGER(iwp) :: jp !< counter, y-direction
3957	INTEGER(iwp) :: n !< loop variable over all agents in a grid box
3958
3959	!
3960	!-- Get direction for all agents in current grid cell
3961	CALL mas_agent_direction
3962
3963	DO n = 1, number_of_agents
3964
3965	force_x = 0.0_wp
3966	force_y = 0.0_wp
3967
3968	CALL mas_timestep_social_forces ( 'acceleration', n, ip, jp )
3969
3970	CALL mas_timestep_social_forces ( 'other_agents', n, ip, jp )
3971
3972	CALL mas_timestep_social_forces ( 'walls', n, ip, jp )
3973	!
3974	!-- Update forces
3975	agents(n)%force_x = force_x
3976	agents(n)%force_y = force_y
3977	ENDDO
3978
3979	END SUBROUTINE mas_timestep_forces_call
3980
3981	!--------------------------------------------------------------------------------------------------!
3982	! Description:
3983	! ------------
3984	!> Euler timestep of agent transport
3985	!--------------------------------------------------------------------------------------------------!
3986	SUBROUTINE mas_timestep
3987
3988	IMPLICIT NONE
3989
3990	INTEGER(iwp) :: n !< loop variable over all agents in a grid box
3991
3992	REAL(wp) :: abs_v !< absolute value of velocity
3993	REAL(wp) :: abs_f !< absolute value of force
3994
3995	DO n = 1, number_of_agents
3996	!
3997	!-- Limit absolute force to a maximum to prevent unrealistic acceleration
3998	abs_f = SQRT( ( agents(n)%force_x )2 + ( agents(n)%force_y )2 )
3999	IF ( abs_f > 20. ) THEN
4000	agents(n)%force_x = agents(n)%force_x * 20. / abs_f
4001	agents(n)%force_y = agents(n)%force_y * 20. / abs_f
4002	ENDIF
4003	!
4004	!-- Update agent speed
4005	agents(n)%speed_x = agents(n)%speed_x + agents(n)%force_x * dt_agent
4006	agents(n)%speed_y = agents(n)%speed_y + agents(n)%force_y * dt_agent
4007	!
4008	!-- Reduction of agent speed to maximum agent speed
4009	abs_v = SQRT( ( agents(n)%speed_x )2 + ( agents(n)%speed_y )2 )
4010	IF ( abs_v > v_max_agent ) THEN
4011	agents(n)%speed_x = agents(n)%speed_x * v_max_agent / abs_v
4012	agents(n)%speed_y = agents(n)%speed_y * v_max_agent / abs_v
4013	ENDIF
4014	!
4015	!-- Update agent position
4016	agents(n)%x = agents(n)%x + agents(n)%speed_x * dt_agent
4017	agents(n)%y = agents(n)%y + agents(n)%speed_y * dt_agent
4018	!
4019	!-- Update absolute value of agent speed
4020	agents(n)%speed_abs = abs_v
4021	!
4022	!-- Increment the agent age and the total time that the agent has advanced within the agent
4023	!-- timestep procedure
4024	agents(n)%age_m = agents(n)%age
4025	agents(n)%age = agents(n)%age + dt_agent
4026	agents(n)%dt_sum = agents(n)%dt_sum + dt_agent
4027	!
4028	!-- Check whether there is still an agent that has not yet completed the total LES timestep
4029	IF ( ( dt_3d - agents(n)%dt_sum ) > 1E-8_wp ) THEN
4030	dt_3d_reached_l_mas = .FALSE.
4031	ENDIF
4032
4033	ENDDO
4034
4035	END SUBROUTINE mas_timestep
4036
4037	!--------------------------------------------------------------------------------------------------!
4038	! Description:
4039	! ------------
4040	!> Calculates the Social Forces (Helbing and Molnar, 1995) that the agent experiences due to
4041	!> acceleration towards target and repulsion by obstacles
4042	!--------------------------------------------------------------------------------------------------!
4043	SUBROUTINE mas_timestep_social_forces ( mode, nl, ip, jp )
4044
4045	IMPLICIT NONE
4046
4047	REAL(wp), PARAMETER :: k_pl = 1.5 !< factor for collision avoidance
4048
4049	CHARACTER (LEN=*) :: mode !< identifier for the mode of calculation
4050
4051	INTEGER(iwp) :: ij_dum !< index of nearest wall
4052	INTEGER(iwp) :: il !< index variable along x
4053	INTEGER(iwp) :: ip !< index variable along x
4054	INTEGER(iwp) :: jl !< index variable along y
4055	INTEGER(iwp) :: jp !< index variable along y
4056	INTEGER(iwp) :: nl !< loop variable over all agents in a grid box
4057	INTEGER(iwp) :: no !< loop variable over all agents in a grid box
4058	INTEGER(iwp) :: noa !< amount of agents in a grid box
4059	INTEGER(iwp) :: sc_x_end !< index for scan for topography/other agents
4060	INTEGER(iwp) :: sc_x_start !< index for scan for topography/other agents
4061	INTEGER(iwp) :: sc_y_end !< index for scan for topography/other agents
4062	INTEGER(iwp) :: sc_y_start !< index for scan for topography/other agents
4063
4064	LOGICAL :: corner_found !< flag that indicates a corner has been found near agent
4065
4066	REAL(wp) :: a_pl !< factor for collision avoidance
4067	REAL(wp) :: ax_semimaj !< semiminor axis of repulsive ellipse
4068	REAL(wp) :: b_pl !< factor for collision avoidance
4069	REAL(wp) :: c_pl !< factor for collision avoidance
4070	REAL(wp) :: coll_t !< time at which the next collision would happen
4071	REAL(wp) :: d_coll_t_0 !< inverse of collision cutoff time
4072	REAL(wp) :: d_pl !< factor for collision avoidance
4073	REAL(wp) :: ddum_f !< dummy devisor collision avoidance
4074	REAL(wp) :: dist !< distance to obstacle
4075	REAL(wp) :: dist_sq !< distance to obstacle squared
4076	REAL(wp) :: pos_rel_x !< relative position of two agents (x)
4077	REAL(wp) :: pos_rel_y !< relative position of two agents (y)
4078	REAL(wp) :: r_sq !< y-position
4079	REAL(wp) :: sra !< scan radius (agents)
4080	REAL(wp) :: srw !< local variable for scan radius (walls)
4081	REAL(wp) :: v_rel_x !< relative velocity (x); collision avoidance
4082	REAL(wp) :: v_rel_y !< relative velocity (y); collision avoidance
4083	REAL(wp) :: x_a !< x-position
4084	REAL(wp) :: x_wall !< x-position of wall
4085	REAL(wp) :: y_a !< y-position
4086	REAL(wp) :: y_wall !< y-position of wall
4087
4088	TYPE(agent_type), DIMENSION(:), POINTER :: l_agts !< agents that repulse current agent
4089
4090	!
4091	!-- Initialization
4092	x_a = agents(nl)%x
4093	y_a = agents(nl)%y
4094
4095	SELECT CASE ( TRIM( mode ) )
4096	!
4097	!-- Calculation of force due to agent trying to approach desired velocity
4098	CASE ( 'acceleration' )
4099
4100	force_x = force_x + d_tau_accel_agent &
4101	* ( agents(nl)%speed_des*agents(nl)%speed_e_x - agents(nl)%speed_x )
4102
4103	force_y = force_y + d_tau_accel_agent &
4104	* ( agents(nl)%speed_des*agents(nl)%speed_e_y - agents(nl)%speed_y )
4105
4106	!
4107	!-- Calculation of repulsive forces by other agents in a radius around the current one
4108	CASE ( 'other_agents' )
4109
4110	sra = scan_radius_agent
4111	d_coll_t_0 = 1./coll_t_0
4112	!
4113	!-- Find relevant gridboxes (those that could contain agents within scan radius)
4114	sc_x_start = FLOOR( (x_a - sra) * ddx )
4115	sc_x_end = FLOOR( (x_a + sra) * ddx )
4116	sc_y_start = FLOOR( (y_a - sra) * ddx )
4117	sc_y_end = FLOOR( (y_a + sra) * ddx )
4118	IF ( sc_x_start < nxlg ) sc_x_start = nxlg
4119	IF ( sc_x_end > nxrg ) sc_x_end = nxrg
4120	IF ( sc_y_start < nysg ) sc_y_start = nysg
4121	IF ( sc_y_end > nyng ) sc_y_end = nyng
4122
4123	sra = sra**2
4124	!
4125	!-- Loop over all previously found relevant gridboxes
4126	DO il = sc_x_start, sc_x_end
4127	DO jl = sc_y_start, sc_y_end
4128	noa = agt_count(jl,il)
4129	IF ( noa <= 0 ) CYCLE
4130	l_agts => grid_agents(jl,il)%agents(1:noa)
4131	DO no = 1, noa
4132	!
4133	!-- Skip self
4134	IF ( jl == jp .AND. il == ip .AND. no == nl ) CYCLE
4135	pos_rel_x = l_agts(no)%x - x_a
4136	pos_rel_y = l_agts(no)%y - y_a
4137	dist_sq = pos_rel_x2 + pos_rel_y2
4138	IF ( dist_sq > sra ) CYCLE
4139	r_sq = (2radius_agent)*2
4140	v_rel_x = agents(nl)%speed_x - l_agts(no)%speed_x
4141	v_rel_y = agents(nl)%speed_y - l_agts(no)%speed_y
4142	!
4143	!-- Collision is already occuring, default to standard social forces.
4144	IF ( dist_sq <= r_sq ) THEN
4145	dist = SQRT( dist_sq ) + 1.0d-12
4146	ax_semimaj = 0.5_wp * SQRT( dist )
4147
4148	force_x = force_x - 0.125_wp * repuls_agent &
4149	* d_sigma_rep_agent / ax_semimaj &
4150	* EXP( - ax_semimaj * d_sigma_rep_agent ) &
4151	* ( pos_rel_x / dist )
4152
4153	force_y = force_y - 0.125_wp * repuls_agent &
4154	* d_sigma_rep_agent / ax_semimaj &
4155	* EXP( - ax_semimaj * d_sigma_rep_agent ) &
4156	* ( pos_rel_y / dist )
4157	!
4158	!-- Currently no collision, calculate collision avoidance force according to
4159	!-- Karamouzas et al (2014, PRL 113,238701)
4160	ELSE
4161	!
4162	!-- Factors
4163	a_pl = v_rel_x2 + v_rel_y2
4164	b_pl = pos_rel_xv_rel_x + pos_rel_yv_rel_y
4165	c_pl = dist_sq - r_sq
4166	d_pl = b_pl*2 - a_plc_pl
4167	!
4168	!-- If the two agents are moving non-parallel, calculate collision avoidance
4169	!-- social force
4170	IF ( d_pl > 0.0_wp .AND. ( a_pl < -0.00001 .OR. a_pl > 0.00001 ) ) THEN
4171
4172	d_pl = SQRT( d_pl )
4173	coll_t = ( b_pl - d_pl ) / a_pl
4174	IF ( coll_t > 0.0_wp ) THEN
4175	!
4176	!-- Dummy factor
4177	ddum_f = 1. / ( a_pl * coll_t*2 ) ( 2. / coll_t + 1.0 * d_coll_t_0 )
4178	!
4179	!-- x-component of social force
4180	force_x = force_x - k_pl * EXP( -coll_t * d_coll_t_0 ) * &
4181	( v_rel_x - ( b_pl * v_rel_x - a_pl * pos_rel_x ) / d_pl ) * &
4182	ddum_f
4183	!
4184	!-- y-component of social force
4185	force_y = force_y - k_pl * EXP( -coll_t * d_coll_t_0 ) * &
4186	( v_rel_y - ( b_pl * v_rel_y - a_pl * pos_rel_y ) / d_pl ) * &
4187	ddum_f
4188
4189	ENDIF
4190	ENDIF
4191	ENDIF
4192	ENDDO
4193	ENDDO
4194	ENDDO
4195
4196	CASE ( 'walls' )
4197
4198	srw = scan_radius_wall
4199	corner_found = .FALSE.
4200	!
4201	!-- Find relevant grid boxes (those that could contain topography within radius)
4202	sc_x_start = (x_a - srw) * ddx
4203	sc_x_end = (x_a + srw) * ddx
4204	sc_y_start = (y_a - srw) * ddx
4205	sc_y_end = (y_a + srw) * ddx
4206	IF ( sc_x_start < nxlg ) sc_x_start = nxlg
4207	IF ( sc_x_end > nxrg ) sc_x_end = nxrg
4208	IF ( sc_y_start < nysg ) sc_y_start = nysg
4209	IF ( sc_y_end > nyng ) sc_y_end = nyng
4210	!
4211	!-- Find "walls" ( i.e. topography steps (up or down) higher than one grid box ) that are
4212	!-- perpendicular to the agent within the defined search radius. Such obstacles cannot be
4213	!-- passed and a social force to that effect is applied.
4214	!-- Walls only apply a force perpendicular to the wall to the agent.
4215	!-- There is therefore a search for walls directly right, left, south and north of the agent.
4216	!-- All other walls are ignored.
4217	!--
4218	!-- Check for wall left of current agent
4219	ij_dum = 0
4220	IF ( sc_x_start < ip ) THEN
4221	DO il = ip - 1, sc_x_start, -1
4222	!
4223	!-- Going left from the agent, check for a right wall
4224	IF ( BTEST( obstacle_flags(jp,il), 2 ) ) THEN
4225	!
4226	!-- Obstacle found in grid box il, wall at right side
4227	x_wall = (il+1)*dx
4228	!
4229	!-- Calculate force of found wall on agent
4230	CALL mas_timestep_wall_corner_force( x_a, x_wall, y_a, y_a )
4231	!
4232	!-- Calculate new x starting index for later scan for corners
4233	ij_dum = il + 1
4234	EXIT
4235	ENDIF
4236	ENDDO
4237	ENDIF
4238	IF ( ij_dum /= 0 ) sc_x_start = ij_dum
4239
4240	!
4241	!-- Check for wall right of current agent
4242	ij_dum = 0
4243	IF ( sc_x_end > ip ) THEN
4244	DO il = ip + 1, sc_x_end
4245	!
4246	!-- Going right from the agent, check for a left wall
4247	IF ( BTEST( obstacle_flags(jp,il), 6 ) ) THEN
4248	!
4249	!-- Obstacle found in grid box il, wall at left side
4250	x_wall = il*dx
4251	!
4252	!-- Calculate force of found wall on agent
4253	CALL mas_timestep_wall_corner_force( x_a, x_wall, y_a, y_a )
4254	!
4255	!-- Calculate new x end index for later scan for corners
4256	ij_dum = il - 1
4257	EXIT
4258	ENDIF
4259	ENDDO
4260	ENDIF
4261	IF ( ij_dum /= 0 ) sc_x_end = ij_dum
4262
4263	!
4264	!-- Check for wall south of current agent
4265	ij_dum = 0
4266	IF ( sc_y_start < jp ) THEN
4267	DO jl = jp - 1, sc_y_start, -1
4268	!
4269	!-- Going south from the agent, check for a north wall
4270	IF ( BTEST( obstacle_flags(jl,ip), 0 ) ) THEN
4271	!
4272	!-- Obstacle found in grid box jl, wall at left side
4273	y_wall = ( jl + 1 ) * dy
4274
4275	CALL mas_timestep_wall_corner_force( x_a, x_a, y_a, y_wall )
4276	!
4277	!-- Calculate new y starting index for later scan for corners
4278	ij_dum = jl + 1
4279	EXIT
4280	ENDIF
4281	ENDDO
4282	ENDIF
4283	IF ( ij_dum /= 0 ) sc_y_start = ij_dum
4284
4285	!
4286	!-- Check for wall north of current agent
4287	ij_dum = 0
4288	IF ( sc_y_end > jp ) THEN
4289	DO jl = jp + 1, sc_y_end
4290	!
4291	!-- Going north from the agent, check for a south wall
4292	IF ( BTEST( obstacle_flags(jl,ip), 4 ) ) THEN
4293	!
4294	!-- obstacle found in grid box jl, wall at left side
4295	y_wall = jl * dy
4296
4297	CALL mas_timestep_wall_corner_force( x_a, x_a, y_a, y_wall )
4298	!
4299	!-- Calculate new y end index for later scan for corners
4300	ij_dum = jl - 1
4301	ENDIF
4302	ENDDO
4303	ENDIF
4304	IF ( ij_dum /= 0 ) sc_y_end = ij_dum
4305
4306	!
4307	!-- Scan for corners surrounding current agent.
4308	!-- Only gridcells that are closer than the closest wall in each direction (n,s,r,l) are
4309	!-- considered in the search since those further away would have a significantly smaller
4310	!-- resulting force than the closer wall.
4311	DO il = sc_x_start, sc_x_end
4312	DO jl = sc_y_start, sc_y_end
4313	IF ( il == ip .OR. jl == jp ) CYCLE
4314	!
4315	!-- Corners left of agent
4316	IF ( il < ip ) THEN
4317	!
4318	!-- South left quadrant: look for north right corner
4319	IF ( jl < jp ) THEN
4320	IF ( BTEST( obstacle_flags(jl,il), 1 ) ) THEN
4321	!
4322	!-- Calculate coordinates of the found corner
4323	x_wall = ( il + 1 ) * dx
4324	y_wall = ( jl + 1 ) * dy
4325
4326	CALL mas_timestep_wall_corner_force( x_a, x_wall, y_a, y_wall )
4327
4328	ENDIF
4329	!
4330	!-- North left quadrant: look for south right corner
4331	ELSEIF ( jl > jp ) THEN
4332	IF ( BTEST( obstacle_flags(jl,il), 3 ) ) THEN
4333	!
4334	!-- Calculate coordinates of the corner of mentioned gridcell that is closest
4335	!-- to the current agent.
4336	x_wall = ( il + 1 ) * dx
4337	y_wall = jl * dy
4338
4339	CALL mas_timestep_wall_corner_force( x_a, x_wall, y_a, y_wall )
4340
4341	ENDIF
4342	ENDIF
4343	ELSEIF ( il > ip ) THEN
4344	!
4345	!-- South right quadrant: look for north left corner
4346	IF ( jl < jp ) THEN
4347	IF ( BTEST( obstacle_flags(jl,il), 7 ) ) THEN
4348	!
4349	!-- Calculate coordinates of the corner of mentioned gridcell that is closest
4350	!-- to the current agent.
4351	x_wall = il * dx
4352	y_wall = ( jl + 1 ) * dy
4353
4354	CALL mas_timestep_wall_corner_force( x_a, x_wall, y_a, y_wall )
4355
4356	ENDIF
4357	!
4358	!-- North right quadrant: look for south left corner
4359	ELSEIF ( jl > jp ) THEN
4360	IF ( BTEST( obstacle_flags(jl,il), 5 ) ) THEN
4361	!
4362	!-- Calculate coordinates of the corner of mentioned gridcell that is closest
4363	!-- to the current agent.
4364	x_wall = il * dx
4365	y_wall = jl * dy
4366
4367	CALL mas_timestep_wall_corner_force( x_a, x_wall, y_a, y_wall )
4368
4369	ENDIF
4370	ENDIF
4371	ENDIF
4372	ENDDO
4373	ENDDO
4374
4375	CASE DEFAULT
4376
4377	END SELECT
4378
4379	END SUBROUTINE mas_timestep_social_forces
4380
4381	!--------------------------------------------------------------------------------------------------!
4382	! Description:
4383	! ------------
4384	!> Given a distance to the current agent, calculates the force a found corner or wall exerts on that
4385	!> agent
4386	!--------------------------------------------------------------------------------------------------!
4387	SUBROUTINE mas_timestep_wall_corner_force( xa, xw, ya, yw )
4388
4389	IMPLICIT NONE
4390
4391	REAL(wp) :: dist_l !< distance to obstacle
4392	REAL(wp) :: force_d_x !< increment of social force, x-direction
4393	REAL(wp) :: force_d_y !< increment of social force, x-direction
4394	REAL(wp) :: xa !< x-position of agent
4395	REAL(wp) :: xw !< x-position of wall
4396	REAL(wp) :: ya !< x-position of agent
4397	REAL(wp) :: yw !< y-position of wall
4398
4399	force_d_x = 0.0_wp
4400	force_d_y = 0.0_wp
4401	!
4402	!-- Calculate coordinates of corner relative to agent postion and distance between corner and agent.
4403	xw = xa - xw
4404	yw = ya - yw
4405	dist_l = SQRT( ( xw )2 + ( yw )2 )
4406	!
4407	!-- Calculate x and y component of repulsive force induced by previously found corner
4408	IF ( dist_l > 0 ) THEN
4409	force_d_x = repuls_wall * d_sigma_rep_wall &
4410	* EXP( -dist_l * d_sigma_rep_wall ) &
4411	* xw / (dist_l)
4412	force_d_y = repuls_wall * d_sigma_rep_wall &
4413	* EXP( -dist_l * d_sigma_rep_wall ) &
4414	* yw / (dist_l)
4415	ENDIF
4416
4417	! !-- forces that are located outside of a sight radius of
4418	! !-- 200 degrees (-> COS(100./180.pi) = COS(.555pi)) of
4419	! !-- current agent are considered to have an effect of 50%
4420	! IF ( force_d_x * agents(nl)%speed_e_x + &
4421	! force_d_y * agents(nl)%speed_e_y < &
4422	! SQRT(force_d_x2 + force_d_y2) * &
4423	! COS( .55555555 * 3.1415 ) ) &
4424	! THEN
4425	! force_d_x = force_d_x * .5_wp
4426	! force_d_y = force_d_y * .5_wp
4427	! ENDIF
4428
4429	!
4430	!-- Add force increment to total force of current agent
4431	force_x = force_x + force_d_x
4432	force_y = force_y + force_d_y
4433
4434	END SUBROUTINE mas_timestep_wall_corner_force
4435
4436
4437	!
4438	!-- Calculates distance of point P to edge (A,B). If A = B, calculates point-to-point distance from
4439	!-- A/B to P.
4440	FUNCTION dist_point_to_edge( a_x, a_y, b_x, b_y, p_x, p_y )
4441
4442	IMPLICIT NONE
4443
4444	REAL(wp) :: a_x !< x-coordinate of point A of edge
4445	REAL(wp) :: a_y !< y-coordinate of point A of edge
4446	REAL(wp) :: ab_x !< x-coordinate of vector from A to B
4447	REAL(wp) :: ab_y !< y-coordinate of vector from A to B
4448	REAL(wp) :: ab_d !< inverse length of vector from A to B
4449	REAL(wp) :: ab_u_x !< x-coordinate of vector with direction of ab and length 1
4450	REAL(wp) :: ab_u_y !< y-coordinate of vector with direction of ab and length 1
4451	REAL(wp) :: ap_x !< x-coordinate of vector from A to P
4452	REAL(wp) :: ap_y !< y-coordinate of vector from A to P
4453	REAL(wp) :: b_x !< x-coordinate of point B of edge
4454	REAL(wp) :: b_y !< y-coordinate of point B of edge
4455	REAL(wp) :: ba_x !< x-coordinate of vector from B to A
4456	REAL(wp) :: ba_y !< y-coordinate of vector from B to A
4457	REAL(wp) :: bp_x !< x-coordinate of vector from B to P
4458	REAL(wp) :: bp_y !< y-coordinate of vector from B to P
4459	REAL(wp) :: dist_x !< x-coordinate of point P
4460	REAL(wp) :: dist_y !< y-coordinate of point P
4461	REAL(wp) :: dist_point_to_edge !< y-coordinate of point P
4462	REAL(wp) :: p_x !< x-coordinate of point P
4463	REAL(wp) :: p_y !< y-coordinate of point P
4464
4465	ab_x = - a_x + b_x
4466	ab_y = - a_y + b_y
4467	ba_x = - b_x + a_x
4468	ba_y = - b_y + a_y
4469	ap_x = - a_x + p_x
4470	ap_y = - a_y + p_y
4471	bp_x = - b_x + p_x
4472	bp_y = - b_y + p_y
4473
4474	IF ( ab_x * ap_x + ab_y * ap_y <= 0. ) THEN
4475	dist_point_to_edge = SQRT( ( a_x - p_x )2 + ( a_y - p_y )2 )
4476	ELSEIF ( ba_x * bp_x + ba_y * bp_y <= 0. ) THEN
4477	dist_point_to_edge = SQRT( ( b_x - p_x )2 + ( b_y - p_y )2)
4478	ELSE
4479	ab_d = 1.0_wp / SQRT( ( ab_x )2 + ( ab_y )2 )
4480	ab_u_x = ab_x * ab_d
4481	ab_u_y = ab_y * ab_d
4482	dist_x = ap_x - ( ap_x * ab_u_x + ap_y * ab_u_y ) * ab_u_x
4483	dist_y = ap_y - ( ap_x * ab_u_x + ap_y * ab_u_y ) * ab_u_y
4484	dist_point_to_edge = SQRT( dist_x2 + dist_y2 )
4485	ENDIF
4486
4487	END FUNCTION dist_point_to_edge
4488
4489	!
4490	!-- Returns the heuristic between points A and B (currently the straight distance)
4491	FUNCTION heuristic( ax, ay, bx, by )
4492
4493	IMPLICIT NONE
4494
4495	REAL(wp) :: ax !< x-coordinate of point A
4496	REAL(wp) :: ay !< y-coordinate of point A
4497	REAL(wp) :: bx !< x-coordinate of point B
4498	REAL(wp) :: by !< y-coordinate of point B
4499	REAL(wp) :: heuristic !< return value
4500
4501	heuristic = SQRT( ( ax - bx )2 + ( ay - by )2 )
4502
4503	END FUNCTION heuristic
4504
4505	!
4506	!-- Calculates if point P is left of the infinite line that contains A and B (direction: A to B).
4507	!-- Concept: 2D rotation of two vectors
4508	FUNCTION is_left( ax, ay, bx, by, px, py )
4509
4510	IMPLICIT NONE
4511
4512	LOGICAL :: is_left !< return value; TRUE if P is left of AB
4513
4514	REAL(wp) :: ax !< x-coordinate of point A
4515	REAL(wp) :: ay !< y-coordinate of point A
4516	REAL(wp) :: bx !< x-coordinate of point B
4517	REAL(wp) :: by !< y-coordinate of point B
4518	REAL(wp) :: px !< x-coordinate of point P
4519	REAL(wp) :: py !< y-coordinate of point P
4520
4521	is_left = (bx-ax)(py-ay)-(px-ax)(by-ay) > 0
4522	IF ( ( ABS( ax - px ) < .001 .AND. ABS( ay - py ) < .001 ) .OR. &
4523	( ABS( bx - px ) < .001 .AND. ABS( by - py ) < .001) ) &
4524	THEN
4525	is_left = .FALSE.
4526	ENDIF
4527
4528	END FUNCTION is_left
4529
4530	!
4531	!-- Calculates if point P is right of the infinite line that contains A and B (direction: A to B)
4532	!-- Concept: 2D rotation of two vectors
4533	FUNCTION is_right( ax, ay, bx, by, px, py )
4534
4535	IMPLICIT NONE
4536
4537	LOGICAL :: is_right !< return value; TRUE if P is right of AB
4538
4539	REAL(wp), INTENT(IN) :: ax !< x-coordinate of point A
4540	REAL(wp), INTENT(IN) :: ay !< y-coordinate of point A
4541	REAL(wp), INTENT(IN) :: bx !< x-coordinate of point B
4542	REAL(wp), INTENT(IN) :: by !< y-coordinate of point B
4543	REAL(wp), INTENT(IN) :: px !< x-coordinate of point P
4544	REAL(wp), INTENT(IN) :: py !< y-coordinate of point P
4545
4546	is_right = (bx-ax)(py-ay)-(px-ax)(by-ay) < 0
4547	IF ( ( ABS( ax - px ) < 0.001_wp .AND. ABS( ay - py ) < 0.001_wp ) .OR. &
4548	( ABS( bx - px ) < 0.001_wp .AND. ABS( by - py ) < 0.001_wp ) ) &
4549	THEN
4550	is_right = .FALSE.
4551	ENDIF
4552
4553	END FUNCTION is_right
4554
4555	!
4556	!-- Returns true if the line segments AB and PQ share an intersection
4557	FUNCTION intersect( ax, ay, bx, by, px, py, qx, qy )
4558
4559	IMPLICIT NONE
4560
4561	LOGICAL :: intersect !< return value; TRUE if intersection was found
4562	LOGICAL :: la !< T if a is left of PQ
4563	LOGICAL :: lb !< T if b is left of PQ
4564	LOGICAL :: lp !< T if p is left of AB
4565	LOGICAL :: lq !< T if q is left of AB
4566	LOGICAL :: poss !< flag that indicates if an intersection is still possible
4567	LOGICAL :: ra !< T if a is right of PQ
4568	LOGICAL :: rb !< T if b is right of PQ
4569	LOGICAL :: rp !< T if p is right of AB
4570	LOGICAL :: rq !< T if q is right of AB
4571
4572	REAL(wp) :: ax !< x-coordinate of point A
4573	REAL(wp) :: ay !< y-coordinate of point A
4574	REAL(wp) :: bx !< x-coordinate of point B
4575	REAL(wp) :: by !< y-coordinate of point B
4576	REAL(wp) :: px !< x-coordinate of point P
4577	REAL(wp) :: py !< y-coordinate of point P
4578	REAL(wp) :: qx !< x-coordinate of point Q
4579	REAL(wp) :: qy !< y-coordinate of point Q
4580
4581	intersect = .FALSE.
4582	poss = .FALSE.
4583	!
4584	!-- Intersection is possible only if P and Q are on opposing sides of AB
4585	lp = is_left(ax,ay,bx,by,px,py)
4586	rq = is_right(ax,ay,bx,by,qx,qy)
4587	IF ( lp .AND. rq ) poss = .TRUE.
4588	IF ( .NOT. poss ) THEN
4589	lq = is_left(ax,ay,bx,by,qx,qy)
4590	rp = is_right(ax,ay,bx,by,px,py)
4591	IF ( lq .AND. rp ) poss = .TRUE.
4592	ENDIF
4593	!
4594	!-- Intersection occurs only if above test (poss) was true AND A and B are on opposing sides of PQ.
4595	IF ( poss ) THEN
4596	la = is_left(px,py,qx,qy,ax,ay)
4597	rb = is_right(px,py,qx,qy,bx,by)
4598	IF ( la .AND. rb ) intersect = .TRUE.
4599	IF ( .NOT. intersect ) THEN
4600	lb = is_left(px,py,qx,qy,bx,by)
4601	ra = is_right(px,py,qx,qy,ax,ay)
4602	IF ( lb .AND. ra ) intersect = .TRUE.
4603	ENDIF
4604	ENDIF
4605
4606	END FUNCTION intersect
4607
4608	!
4609	!-- Gives a nuber randomly distributed around an average
4610	FUNCTION random_normal( avg, variation )
4611
4612	IMPLICIT NONE
4613
4614	REAL(wp) :: avg !< x-coordinate of vector from A to B
4615	REAL(wp) :: random_normal !< y-coordinate of vector from A to B
4616	REAL(wp) :: variation !< y-coordinate of vector from A to B
4617
4618	REAL(wp), DIMENSION(12) :: random_arr !< inverse length of vector from A to B
4619
4620	CALL RANDOM_NUMBER( random_arr )
4621	random_normal = avg + variation * ( SUM( random_arr ) - 6.0_wp )
4622
4623	END FUNCTION random_normal
4624
4625
4626	END MODULE multi_agent_system_mod

Note: See TracBrowser for help on using the repository browser.

Context Navigation

source: palm/trunk/SOURCE/multi_agent_system_mod.f90 @ 4847

Download in other formats: