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source: palm/trunk/SOURCE/multi_agent_system_mod.f90 @ 4830

Last change on this file since 4830 was 4828, checked in by Giersch, 4 years ago
Copyright updated to year 2021, interface pmc_sort removed to accelarate the nesting code
Property svn:keywords set to `Id`
File size: 189.8 KB

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

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