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source: palm/trunk/SOURCE/multi_agent_system_mod.f90 @ 4688

Last change on this file since 4688 was 4623, checked in by raasch, 4 years ago
some switches calculated explicitly to avoid compiler warnings
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1	!> @file multi_agent_system_mod.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM-4U.
4	!
5	! PALM-4U is free software: you can redistribute it and/or modify it under the
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! version.
9	!
10	! PALM-4U is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 2016-2020 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: multi_agent_system_mod.f90 4623 2020-07-24 08:42:02Z maronga $
27	! some switches calculated explicitly to avoid compiler warnings
28	!
29	! 4481 2020-03-31 18:55:54Z maronga
30	! bugfix: cpp-directives for serial mode added
31	!
32	! 4346 2019-12-18 11:55:56Z motisi
33	! Removed wall_flags_static_0 from USE statements as it's not used within
34	! the module
35	!
36	! 4329 2019-12-10 15:46:36Z motisi
37	! Renamed wall_flags_0 to wall_flags_static_0
38	!
39	! 4307 2019-11-26 14:12:36Z maronga
40	! Activated output of iPT
41	!
42	! 4182 2019-08-22 15:20:23Z scharf
43	! Corrected "Former revisions" section
44	!
45	! 4168 2019-08-16 13:50:17Z suehring
46	! Replace function get_topography_top_index by topo_top_ind
47	!
48	! 3987 2019-05-22 09:52:13Z kanani
49	! Introduce alternative switch for debug output during timestepping
50	!
51	! 3885 2019-04-11 11:29:34Z kanani
52	! Changes related to global restructuring of location messages and introduction
53	! of additional debug messages
54	!
55	! 3876 2019-04-08 18:41:49Z knoop
56	! replaced nspec by nvar: only variable species should bconsidered, fixed species are not relevant
57	!
58	! 3766 2019-02-26 16:23:41Z raasch
59	! save attribute added to local targets to avoid outlive pointer target warning
60	!
61	! 3665 2019-01-10 08:28:24Z raasch
62	! unused variables removed
63	!
64	! 3159 2018-07-20 11:20:01Z sward
65	! Initial revision
66	!
67	!
68	!
69	! Authors:
70	! --------
71	! @author sward
72	!
73	!
74	! Description:
75	! ------------
76	!> Multi Agent System for the simulation of pedestrian movement in urban
77	!> 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, &
102	topo_top_ind
103
104	USE random_function_mod, &
105	ONLY: random_function
106
107	USE kinds
108
109	USE pegrid
110
111	CHARACTER(LEN=15) :: bc_mas_lr = 'absorb' !< left/right boundary condition
112	CHARACTER(LEN=15) :: bc_mas_ns = 'absorb' !< north/south boundary condition
113
114	INTEGER(iwp) :: deleted_agents = 0 !< number of deleted agents per time step
115	INTEGER(iwp) :: dim_size_agtnum_manual = 9999999 !< namelist parameter (see documentation)
116	INTEGER(iwp) :: heap_count !< number of items in binary heap (for pathfinding)
117	INTEGER(iwp) :: ibc_mas_lr !< agent left/right boundary condition dummy
118	INTEGER(iwp) :: ibc_mas_ns !< agent north/south boundary condition dummy
119	! INTEGER(iwp) :: ind_pm10 = -9 !< chemical species index of PM10
120	! INTEGER(iwp) :: ind_pm25 = -9 !< chemical species index of PM2.5
121	INTEGER(iwp) :: iran_agent = -1234567 !< number for random generator
122	INTEGER(iwp) :: min_nr_agent = 2 !< namelist parameter (see documentation)
123	#if defined( __parallel )
124	INTEGER(iwp) :: ghla_count_recv !< number of agents in left ghost layer
125	INTEGER(iwp) :: ghna_count_recv !< number of agents in north ghost layer
126	INTEGER(iwp) :: ghra_count_recv !< number of agents in right ghost layer
127	INTEGER(iwp) :: ghsa_count_recv !< number of agents in south ghost layer
128	INTEGER(iwp) :: nr_move_north !< number of agts to move north during exchange_horiz
129	INTEGER(iwp) :: nr_move_south !< number of agts to move south during exchange_horiz
130	#endif
131	INTEGER(iwp) :: maximum_number_of_agents = 0 !< maximum number of agents during run
132	INTEGER(iwp) :: number_of_agents = 0 !< number of agents for each grid box (3d array is saved on agt_count)
133	INTEGER(iwp) :: number_of_agent_groups = 1 !< namelist parameter (see documentation)
134	INTEGER(iwp) :: sort_count_mas = 0 !< counter for sorting agents
135	INTEGER(iwp) :: agt_path_size = 15 !< size of agent path array
136	INTEGER(iwp) :: step_dealloc_mas = 100 !< namelist parameter (see documentation)
137	INTEGER(iwp) :: total_number_of_agents !< total number of agents in the whole model domain
138
139	INTEGER(iwp), PARAMETER :: NR_2_direction_move = 10000 !< parameter for agent exchange
140	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !< phase parameter
141	INTEGER(iwp), PARAMETER :: PHASE_RELEASE = 2 !< phase parameter
142
143	INTEGER(iwp), PARAMETER :: max_number_of_agent_groups = 100 !< maximum allowed number of agent groups
144
145	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: agt_count !< 3d array of number of agents of every grid box
146	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: s_measure_height !< k-index(s-grid) for measurement
147	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: top_top_s !< k-index of first s-gridpoint above topography
148	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: top_top_w !< k-index of first v-gridpoint above topography
149	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: obstacle_flags !< flags to identify corners and edges of topography that cannot be crossed by agents
150
151	LOGICAL :: deallocate_memory_mas = .TRUE. !< namelist parameter (see documentation)
152	LOGICAL :: dt_3d_reached_mas !< flag: agent timestep has reached model timestep
153	LOGICAL :: dt_3d_reached_l_mas !< flag: agent timestep has reached model timestep
154	LOGICAL :: agents_active = .FALSE. !< flag for agent system
155	LOGICAL :: random_start_position_agents = .TRUE. !< namelist parameter (see documentation)
156	LOGICAL :: read_agents_from_restartfile = .FALSE. !< namelist parameter (see documentation)
157	LOGICAL :: agent_own_timestep = .FALSE. !< namelist parameter (see documentation)
158
159	LOGICAL, DIMENSION(max_number_of_agent_groups) :: a_rand_target = .FALSE. !< namelist parameter (see documentation)
160
161	REAL(wp) :: agent_maximum_age = 9999999.9_wp !< namelist parameter (see documentation)
162	REAL(wp) :: agent_substep_time = 0.0_wp !< time measurement during one LES timestep
163	REAL(wp) :: alloc_factor_mas = 20.0_wp !< namelist parameter (see documentation)
164	REAL(wp) :: coll_t_0 = 3. !< namelist parameter (see documentation)
165	REAL(wp) :: corner_gate_start = 0.5_wp !< namelist parameter (see documentation)
166	REAL(wp) :: corner_gate_width = 1.0_wp !< namelist parameter (see documentation)
167	REAL(wp) :: dim_size_factor_agtnum = 1.0_wp !< namelist parameter (see documentation)
168	REAL(wp) :: d_sigma_rep_agent !< inverse of sigma_rep_agent
169	REAL(wp) :: d_sigma_rep_wall !< inverse of sigma_rep_wall
170	REAL(wp) :: d_tau_accel_agent !< inverse of tau_accel_agent
171	REAL(wp) :: desired_speed = 1.2_wp !< namelist parameter (see documentation)
172	REAL(wp) :: des_sp_sig = .2_wp !< namelist parameter (see documentation)
173	REAL(wp) :: dist_target_reached = 2.0_wp !< distance at which target counts as reached
174	REAL(wp) :: dist_to_int_target = .25_wp !< namelist parameter (see documentation)
175	REAL(wp) :: dt_agent = 0.02_wp !< namelist parameter (see documentation)
176	REAL(wp) :: dt_arel = 9999999.9_wp !< namelist parameter (see documentation)
177	REAL(wp) :: end_time_arel = 9999999.9_wp !< namelist parameter (see documentation)
178	REAL(wp) :: force_x !< dummy value for force on current agent in x-direction
179	REAL(wp) :: force_y !< dummy value for force on current agent in y-direction
180	REAL(wp) :: max_dist_from_path = 0.25_wp !< distance from current path at which a new path is calculated
181	REAL(wp) :: radius_agent = .25_wp !< namelist parameter (see documentation)
182	REAL(wp) :: repuls_agent = 1.5_wp !< namelist parameter (see documentation)
183	REAL(wp) :: repuls_wall = 7.0_wp !< namelist parameter (see documentation)
184	REAL(wp) :: scan_radius_agent = 3.0_wp !< namelist parameter (see documentation)
185	REAL(wp) :: scan_radius_wall = 2.0_wp !< namelist parameter (see documentation)
186	REAL(wp) :: sigma_rep_agent = 0.3_wp !< namelist parameter (see documentation)
187	REAL(wp) :: sigma_rep_wall = 0.1_wp !< namelist parameter (see documentation)
188	REAL(wp) :: tau_accel_agent = 0.5_wp !< namelist parameter (see documentation)
189	REAL(wp) :: time_arel = 0.0_wp !< time for agent release
190	REAL(wp) :: time_write_agent_data = 0.0_wp !< write agent data at current time on file
191	REAL(wp) :: v_max_agent = 1.3_wp !< namelist parameter (see documentation)
192
193	REAL(wp), DIMENSION(:), ALLOCATABLE :: dummy_path_x !< dummy path (x-coordinate)
194	REAL(wp), DIMENSION(:), ALLOCATABLE :: dummy_path_y !< dummy path (y-coordinate)
195
196	REAL(wp), DIMENSION(max_number_of_agent_groups) :: adx = 9999999.9_wp !< namelist parameter (see documentation)
197	REAL(wp), DIMENSION(max_number_of_agent_groups) :: ady = 9999999.9_wp !< namelist parameter (see documentation)
198	REAL(wp), DIMENSION(max_number_of_agent_groups) :: asl = 9999999.9_wp !< namelist parameter (see documentation)
199	REAL(wp), DIMENSION(max_number_of_agent_groups) :: asn = 9999999.9_wp !< namelist parameter (see documentation)
200	REAL(wp), DIMENSION(max_number_of_agent_groups) :: asr = 9999999.9_wp !< namelist parameter (see documentation)
201	REAL(wp), DIMENSION(max_number_of_agent_groups) :: ass = 9999999.9_wp !< namelist parameter (see documentation)
202	REAL(wp), DIMENSION(max_number_of_agent_groups) :: at_x = 9999999.9_wp !< namelist parameter (see documentation)
203	REAL(wp), DIMENSION(max_number_of_agent_groups) :: at_y = 9999999.9_wp !< namelist parameter (see documentation)
204	!
205	!-- Type for the definition of an agent
206	TYPE agent_type
207	INTEGER(iwp) :: block_nr !< number for sorting
208	INTEGER(iwp) :: group !< number of agent group
209	INTEGER(idp) :: id !< particle ID (64 bit integer)
210	INTEGER(iwp) :: path_counter !< current target along path (path_x/y)
211	LOGICAL :: agent_mask !< if this parameter is set to false the agent will be deleted
212	REAL(wp) :: age !< age of agent
213	REAL(wp) :: age_m !< age of agent
214	REAL(wp) :: dt_sum !< sum of agents subtimesteps
215	REAL(wp) :: clo !< clothing index
216	REAL(wp) :: energy_storage !< energy stored by agent
217	REAL(wp) :: clothing_temp !< energy stored by agent
218	REAL(wp) :: actlev !< metabolic + work energy of the person
219	REAL(wp) :: age_years !< physical age of the person
220	REAL(wp) :: weight !< total weight of the person (kg)
221	REAL(wp) :: height !< height of the person (m)
222	REAL(wp) :: work !< workload of the agent (W)
223	INTEGER(iwp) :: sex !< agents gender: 1 = male, 2 = female
224	REAL(wp) :: force_x !< force term x-direction
225	REAL(wp) :: force_y !< force term y-direction
226	REAL(wp) :: origin_x !< origin x-position of agent
227	REAL(wp) :: origin_y !< origin y-position of agent
228	REAL(wp) :: pm10 !< PM10 concentration at agent position
229	REAL(wp) :: pm25 !< PM25 concentration at agent position
230	REAL(wp) :: speed_abs !< absolute value of agent speed
231	REAL(wp) :: speed_e_x !< normalized speed of agent in x
232	REAL(wp) :: speed_e_y !< normalized speed of agent in y
233	REAL(wp) :: speed_des !< agent's desired speed
234	REAL(wp) :: speed_x !< speed of agent in x
235	REAL(wp) :: speed_y !< speed of agent in y
236	REAL(wp) :: ipt !< instationary thermal index iPT (degree_C)
237	REAL(wp) :: windspeed !< absolute value of windspeed at agent position
238	REAL(wp) :: x !< x-position
239	REAL(wp) :: y !< y-position
240	REAL(wp) :: t !< temperature
241	REAL(wp) :: t_x !< x-position
242	REAL(wp) :: t_y !< y-position
243	REAL(wp), DIMENSION(0:15) :: path_x !< agent path to target (x)
244	REAL(wp), DIMENSION(0:15) :: path_y !< agent path to target (y)
245	END TYPE agent_type
246
247	TYPE(agent_type), DIMENSION(:), POINTER :: agents !< Agent array for this grid cell
248	TYPE(agent_type) :: zero_agent !< zero agent to avoid weird thing
249	#if defined( __parallel )
250	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: move_also_north !< for agent exchange between PEs
251	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: move_also_south !< for agent exchange between PEs
252	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_l !< ghost layer left of pe domain
253	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_n !< ghost layer north of pe domain
254	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_r !< ghost layer right of pe domain
255	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_s !< ghost layer south of pe domain
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	!-- local meteorological conditions
366	REAL(wp) :: tmrt !< mean radiant temperature (degree_C)
367	REAL(wp) :: ta !< air temperature (degree_C)
368	REAL(wp) :: vp !< vapour pressure (hPa)
369	REAL(wp) :: v !< wind speed (local level) (m/s)
370	REAL(wp) :: pair !< air pressure (hPa)
371
372
373	LOGICAL :: first_loop_stride !< flag for first loop stride of agent sub-timesteps
374	LOGICAL, SAVE :: first_call = .TRUE. !< first call of mas flag for output
375
376
377	IF ( debug_output_timestep ) CALL debug_message( 'multi_agent_system', 'start' )
378
379	CALL cpu_log( log_point(9), 'mas', 'start' )
380	!
381	!-- Initialize variables for the next (sub-) timestep, i.e., for marking
382	!-- those agents to be deleted after the timestep
383	deleted_agents = 0
384	agent_substep_time = 0.0_wp
385	!
386	!-- If necessary, release new set of agents
387	IF ( time_arel >= dt_arel .AND. end_time_arel > time_since_reference_point ) THEN
388
389	CALL mas_create_agent(PHASE_RELEASE)
390	!
391	!-- The MOD function allows for changes in the output interval with
392	!-- 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
405	!-- (within the total domain!) 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
426	!-- reached the model 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
469	!-- has advanced within the 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
475	!-- at the end of this loop. If at least one agent has failed to
476	!-- reach the LES timestep, this switch will be set false in
477	!-- mas_transport.
478	dt_3d_reached_l_mas = .TRUE.
479	!
480	!-- Timestep
481	CALL mas_timestep
482	!
483	!-- Delete agents that have been simulated longer than allowed
484	CALL mas_boundary_conds( 'max_sim_time' )
485	!
486	!-- Delete agents that have reached target area
487	CALL mas_boundary_conds( 'target_area' )
488	!
489	!--- If not all agents of the actual grid cell have reached the
490	!-- LES timestep, this cell has to to another loop iteration. Due to
491	!-- the fact that agents can move into neighboring grid cell,
492	!-- these neighbor cells also have to perform another loop iteration
493	IF ( .NOT. dt_3d_reached_l_mas ) THEN
494	js = MAX(nys,j-1)
495	je = MIN(nyn,j+1)
496	is = MAX(nxl,i-1)
497	ie = MIN(nxr,i+1)
498	grid_agents(js:je,is:ie)%time_loop_done = .FALSE.
499	ENDIF
500
501	ENDDO
502	ENDDO
503	CALL cpu_log( log_point_s(16), 'mas_timestep', 'stop' )
504
505	!
506	!-- Find out, if all agents on every PE have completed the LES timestep
507	!-- and set the switch corespondingly
508	dt_3d_reached_l_mas = ALL(grid_agents(:,:)%time_loop_done)
509	#if defined( __parallel )
510	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
511	CALL MPI_ALLREDUCE( dt_3d_reached_l_mas, dt_3d_reached_mas, 1, MPI_LOGICAL, &
512	MPI_LAND, comm2d, ierr )
513	#else
514	dt_3d_reached_mas = dt_3d_reached_l_mas
515	#endif
516
517	!
518	!-- Increment time since last release
519	IF ( dt_3d_reached_mas ) time_arel = time_arel + dt_3d
520
521	!
522	!-- Move Agents local to PE to a different grid cell
523	CALL cpu_log( log_point_s(18), 'mas_move_exch_sort', 'start' )
524	CALL mas_eh_move_agent
525	!
526	!-- Horizontal boundary conditions including exchange between subdmains
527	CALL mas_eh_exchange_horiz
528	!
529	!-- Pack agents (eliminate those marked for deletion),
530	!-- determine new number of agents
531	CALL mas_ps_sort_in_subboxes
532	CALL cpu_log( log_point_s(18), 'mas_move_exch_sort', 'stop' )
533	!
534	!-- Initialize variables for the next (sub-) timestep, i.e., for marking
535	!-- those agents to be deleted after the timestep
536	deleted_agents = 0
537
538	IF ( biometeorology ) THEN
539	!
540	!-- Fill out the MRT 2D grid from appropriate source (RTM, RRTMG,...)
541	CALL bio_calculate_mrt_grid ( .FALSE. )
542	!
543	!-- Call of human thermal comfort mod (and UV exposure)
544	DO i = nxl, nxr
545	DO j = nys, nyn
546
547	number_of_agents = agt_count(j,i)
548	!
549	!-- If grid cell gets empty, cycle
550	IF ( number_of_agents <= 0 ) CYCLE
551
552	agents => grid_agents(j,i)%agents(1:number_of_agents)
553	!
554	!-- Evaluation of social forces
555	! CALL bio_dynamic( i, j )
556	!
557	!-- Determine local meteorological conditions
558	CALL bio_get_thermal_index_input_ij ( .FALSE., i, j, ta, vp, &
559	v, pair, tmrt )
560
561	DO a = 1, number_of_agents
562	!
563	!-- Calculate instationary thermal indices based on local tmrt
564
565	CALL bio_calc_ipt ( ta, vp, v, pair, tmrt, &
566	agents(a)%dt_sum, &
567	agents(a)%energy_storage, &
568	agents(a)%clothing_temp, &
569	agents(a)%clo, &
570	agents(a)%actlev, &
571	agents(a)%age_years, &
572	agents(a)%weight, &
573	agents(a)%height, &
574	agents(a)%work, &
575	agents(a)%sex, &
576	agents(a)%ipt )
577	END DO
578
579	ENDDO
580	ENDDO
581	ENDIF
582
583	IF ( dt_3d_reached_mas ) EXIT
584
585	first_loop_stride = .FALSE.
586	ENDDO ! timestep loop
587
588	!
589	!-- Deallocate unused memory
590	IF ( deallocate_memory_mas .AND. mas_count == step_dealloc_mas ) THEN
591	CALL mas_eh_dealloc_agents_array
592	mas_count = 0
593	ELSEIF ( deallocate_memory_mas ) THEN
594	mas_count = mas_count + 1
595	ENDIF
596
597	CALL cpu_log( log_point(9), 'mas', 'stop' )
598
599	IF ( debug_output_timestep ) CALL debug_message( 'multi_agent_system', 'end' )
600
601
602	END SUBROUTINE multi_agent_system
603
604	!------------------------------------------------------------------------------!
605	! Description:
606	! ------------
607	!> Calculation of the direction vector from each agent to its current
608	!> intermittent target
609	!------------------------------------------------------------------------------!
610	SUBROUTINE mas_agent_direction
611
612	IMPLICIT NONE
613
614	LOGICAL :: path_flag !< true if new path must be calculated
615
616	INTEGER(iwp) :: n !< loop variable over all agents in a grid box
617	INTEGER(iwp) :: pc !< agent path counter
618
619	REAL(wp) :: abs_dir !< length of direction vector (for normalization)
620	! REAL(wp) :: d_curr_target !< rounding influence expressed as x speed component
621	! REAL(wp) :: d_prev_target !< rounding influence expressed as x speed component
622	REAL(wp) :: dir_x !< direction of agent (x)
623	REAL(wp) :: dir_y !< direction of agent (y)
624	! REAL(wp) :: dist_round = 3. !< distance at which agents start rounding a corner
625	REAL(wp) :: dtit !< distance to intermittent target
626	! REAL(wp) :: round_fac = 0.2 !< factor for rounding influence
627	! REAL(wp) :: speed_round_x !< rounding influence expressed as x speed component
628	! REAL(wp) :: speed_round_y !< rounding influence expressed as x speed component
629
630	!
631	!-- loop over all agents in the current grid box
632	DO n = 1, number_of_agents
633	path_flag = .FALSE.
634	pc = agents(n)%path_counter
635	!
636	!-- If no path was calculated for agent yet, do it
637	IF ( pc >= 999 ) THEN
638	CALL mas_nav_find_path(n)
639	pc = agents(n)%path_counter
640	!
641	!-- Check if new path must be calculated and if so, do it
642	ELSE
643	!
644	!-- Case one: Agent has come close enough to intermittent target.
645	!-- -> chose new int target and calculate rest of path if no
646	!-- new intermittent targets are left
647	dtit = SQRT((agents(n)%x - agents(n)%path_x(pc))**2 &
648	+ (agents(n)%y - agents(n)%path_y(pc))**2)
649	IF ( dtit < dist_to_int_target ) THEN
650	agents(n)%path_counter = agents(n)%path_counter + 1
651	pc = agents(n)%path_counter
652	!
653	!-- Path counter out of scope (each agent can store a maximum of 15
654	!-- intermittent targets on the way to her final target); new path
655	!-- must be calculated
656	IF ( pc >= SIZE(agents(n)%path_x) ) THEN
657	path_flag = .TRUE.
658	ENDIF
659	!
660	!-- Case two: Agent too far from path
661	!-- -> set flag for new path to be calculated
662	ELSEIF ( dist_point_to_edge(agents(n)%path_x(pc-1), &
663	agents(n)%path_y(pc-1), &
664	agents(n)%path_x(pc), &
665	agents(n)%path_y(pc), &
666	agents(n)%x, agents(n)%y) &
667	> max_dist_from_path ) &
668	THEN
669	path_flag = .TRUE.
670	ENDIF
671	!
672	!-- If either of the above two cases was true, calculate new path and
673	!-- reset 0th path point. This point (the last target the agent had)
674	!-- is needed for the agents rounding of corners and the calculation
675	!-- of her deviation from her current path
676	IF ( path_flag ) THEN
677	CALL mas_nav_find_path(n)
678	pc = agents(n)%path_counter
679	ENDIF
680	ENDIF
681	!
682	!-- Normalize direction vector
683	abs_dir = 1.0d-12
684	dir_x = agents(n)%path_x(pc) - agents(n)%x
685	dir_y = agents(n)%path_y(pc) - agents(n)%y
686	abs_dir = SQRT(dir_x2 + dir_y2)+1.0d-12
687	!-- needed later for corner rounding
688	! dir_x = dir_x/abs_dir
689	! dir_y = dir_y/abs_dir
690	! dir_x = dir_x + speed_round_x
691	! dir_y = dir_y + speed_round_y
692	! abs_dir = SQRT(dir_x2 + dir_y2)+1.0d-12
693	agents(n)%speed_e_x = dir_x/abs_dir
694	agents(n)%speed_e_y = dir_y/abs_dir
695	ENDDO
696
697	!
698	!-- corner rounding; to be added
699	!
700	!-- Calculate direction change due to rounding of corners
701
702	! speed_round_x = 0.
703	! speed_round_y = 0.
704	!
705	! d_curr_target = SQRT( (agents(n)%path_x(pc) - agents(n)%x)**2 + &
706	! (agents(n)%path_y(pc) - agents(n)%y)**2 )
707	! d_prev_target = SQRT( (agents(n)%path_x(pc-1) - agents(n)%x)**2 + &
708	! (agents(n)%path_y(pc-1) - agents(n)%y)**2 )
709	! !
710	! !-- Agent is close to next target and that target is not the final one
711	! IF ( d_curr_target < dist_round .AND. dist_round < &
712	! SQRT( (agents(n)%path_x(pc) - agents(n)%t_x)**2 + &
713	! (agents(n)%path_y(pc) - agents(n)%t_y)**2 ) ) &
714	! THEN
715	! speed_round_x = (agents(n)%path_x(pc+1) - agents(n)%path_x(pc)) / &
716	! ABS( agents(n)%path_x(pc) &
717	! - agents(n)%path_x(pc+1)) * round_fac * &
718	! SIN( pi/dist_round*d_curr_target )
719	! speed_round_y = (agents(n)%path_y(pc+1) - agents(n)%path_y(pc)) / &
720	! ABS( agents(n)%path_y(pc) &
721	! - agents(n)%path_y(pc+1)) * round_fac * &
722	! SIN( pi/dist_round*d_curr_target )
723	! ENDIF
724	!
725	! IF ( d_prev_target < dist_round ) THEN
726	! IF ( agents(n)%path_x(pc) /= agents(n)%path_x(pc+1) ) THEN
727	! speed_round_x = speed_round_x + &
728	! (agents(n)%path_x(pc) - agents(n)%path_x(pc+1)) / &
729	! ABS( agents(n)%path_x(pc) &
730	! - agents(n)%path_x(pc+1)) * round_fac * &
731	! SIN( pi/dist_round*d_prev_target )
732	! ENDIF
733	!
734	! IF ( agents(n)%path_y(pc) /= agents(n)%path_y(pc+1) ) THEN
735	! speed_round_y = speed_round_y + &
736	! (agents(n)%path_y(pc) - agents(n)%path_y(pc+1)) / &
737	! ABS( agents(n)%path_y(pc) &
738	! - agents(n)%path_y(pc+1)) * round_fac * &
739	! SIN( pi/dist_round*d_prev_target )
740	! ENDIF
741
742	! ENDIF
743
744
745	END SUBROUTINE mas_agent_direction
746
747	!------------------------------------------------------------------------------!
748	! Description:
749	! ------------
750	!> Boundary conditions for maximum time, target reached and out of domain
751	!------------------------------------------------------------------------------!
752	SUBROUTINE mas_boundary_conds( location )
753
754	IMPLICIT NONE
755
756	CHARACTER (LEN=*) :: location !< Identifier
757
758	INTEGER(iwp) :: n !< agent number
759	INTEGER(iwp) :: grp !< agent group
760
761	REAL(wp) :: dist_to_target !< distance to target
762
763	IF ( location == 'max_sim_time' ) THEN
764
765	!
766	!-- Delete agents that have been simulated longer than allowed
767	DO n = 1, number_of_agents
768
769	IF ( agents(n)%age > agent_maximum_age .AND. &
770	agents(n)%agent_mask ) &
771	THEN
772	agents(n)%agent_mask = .FALSE.
773	deleted_agents = deleted_agents + 1
774	ENDIF
775
776	ENDDO
777	ENDIF
778
779	IF ( location == 'target_area' ) THEN
780
781	!
782	!-- Delete agents that entered target region
783	DO n = 1, number_of_agents
784	grp = agents(n)%group
785	dist_to_target = SQRT((agents(n)%x-at_x(grp))**2 &
786	+ (agents(n)%y-at_y(grp))**2)
787	IF ( dist_to_target < dist_target_reached ) THEN
788	agents(n)%agent_mask = .FALSE.
789	deleted_agents = deleted_agents + 1
790	ENDIF
791
792	ENDDO
793	ENDIF
794
795	END SUBROUTINE mas_boundary_conds
796
797	!------------------------------------------------------------------------------!
798	! Description:
799	! ------------
800	!> Release new agents at their respective sources
801	!------------------------------------------------------------------------------!
802	SUBROUTINE mas_create_agent (phase)
803
804	IMPLICIT NONE
805
806	INTEGER(iwp) :: alloc_size !< relative increase of allocated memory for agents
807	INTEGER(iwp) :: i !< loop variable ( agent groups )
808	INTEGER(iwp) :: ip !< index variable along x
809	INTEGER(iwp) :: jp !< index variable along y
810	INTEGER(iwp) :: loop_stride !< loop variable for initialization
811	INTEGER(iwp) :: n !< loop variable ( number of agents )
812	INTEGER(iwp) :: new_size !< new size of allocated memory for agents
813	INTEGER(iwp) :: rn_side !< index of agent path
814
815	INTEGER(iwp), INTENT(IN) :: phase !< mode of inititialization
816
817	INTEGER(iwp), DIMENSION(nysg:nyng,nxlg:nxrg) :: local_count !< start address of new agent
818	INTEGER(iwp), DIMENSION(nysg:nyng,nxlg:nxrg) :: local_start !< start address of new agent
819
820	LOGICAL :: first_stride !< flag for initialization
821
822	REAL(wp) :: pos_x !< increment for agent position in x
823	REAL(wp) :: pos_y !< increment for agent position in y
824	REAL(wp) :: rand_contr !< dummy argument for random position
825	REAL(wp) :: rn_side_dum !< index of agent path
826
827	TYPE(agent_type),TARGET :: tmp_agent !< temporary agent used for initialization
828
829	!
830	!-- Calculate agent positions and store agent attributes, if
831	!-- agent is situated on this PE
832	DO loop_stride = 1, 2
833	first_stride = (loop_stride == 1)
834	IF ( first_stride ) THEN
835	local_count = 0 ! count number of agents
836	ELSE
837	local_count = agt_count ! Start address of new agents
838	ENDIF
839
840	DO i = 1, number_of_agent_groups
841
842	pos_y = ass(i)
843
844	DO WHILE ( pos_y <= asn(i) )
845
846	IF ( pos_y >= nys * dy .AND. &
847	pos_y < ( nyn + 1 ) * dy ) &
848	THEN
849
850	pos_x = asl(i)
851
852	xloop: DO WHILE ( pos_x <= asr(i) )
853
854	IF ( pos_x >= nxl * dx .AND. &
855	pos_x < ( nxr + 1) * dx ) &
856	THEN
857
858	tmp_agent%agent_mask = .TRUE.
859	tmp_agent%group = i
860	tmp_agent%id = 0_idp
861	tmp_agent%block_nr = -1
862	tmp_agent%path_counter = 999 !SIZE(tmp_agent%path_x)
863	tmp_agent%age = 0.0_wp
864	tmp_agent%age_m = 0.0_wp
865	tmp_agent%dt_sum = 0.0_wp
866	tmp_agent%clo = -999.0_wp
867	tmp_agent%energy_storage= 0.0_wp
868	tmp_agent%ipt = 99999.0_wp
869	tmp_agent%clothing_temp = -999._wp !< energy stored by agent (W)
870	tmp_agent%actlev = 134.6862_wp !< metabolic + work energy of the person
871	tmp_agent%age_years = 35._wp !< physical age of the person
872	tmp_agent%weight = 75._wp !< total weight of the person (kg)
873	tmp_agent%height = 1.75_wp !< height of the person (m)
874	tmp_agent%work = 134.6862_wp !< workload of the agent (W)
875	tmp_agent%sex = 1 !< agents gender: 1 = male, 2 = female
876	tmp_agent%force_x = 0.0_wp
877	tmp_agent%force_y = 0.0_wp
878	tmp_agent%origin_x = pos_x
879	tmp_agent%origin_y = pos_y
880	tmp_agent%speed_abs = 0.0_wp
881	tmp_agent%speed_e_x = 0.0_wp
882	tmp_agent%speed_e_y = 0.0_wp
883	tmp_agent%speed_des = random_normal(desired_speed,&
884	des_sp_sig)
885	tmp_agent%speed_x = 0.0_wp
886	tmp_agent%speed_y = 0.0_wp
887	tmp_agent%x = pos_x
888	tmp_agent%y = pos_y
889	tmp_agent%path_x = -1.0_wp
890	tmp_agent%path_y = -1.0_wp
891	tmp_agent%t_x = - pi
892	tmp_agent%t_y = - pi
893	!
894	!-- Determine the grid indices of the agent position
895	ip = tmp_agent%x * ddx
896	jp = tmp_agent%y * ddy
897	!
898	!-- Give each agent its target
899	IF ( a_rand_target(i) ) THEN
900	!
901	!-- Agent shall receive random target just outside
902	!-- simulated area
903	rn_side_dum = random_function(iran_agent)
904	rn_side = FLOOR(4.*rn_side_dum)
905	IF ( rn_side < 2 ) THEN
906	IF ( rn_side == 0 ) THEN
907	tmp_agent%t_y = -2*dy
908	ELSE
909	tmp_agent%t_y = (ny+3)*dy
910	ENDIF
911	tmp_agent%t_x = random_function(iran_agent) * &
912	(nx+1)*dx
913	ELSE
914	IF ( rn_side == 2 ) THEN
915	tmp_agent%t_x = -2*dx
916	ELSE
917	tmp_agent%t_x = (nx+3)*dx
918	ENDIF
919	tmp_agent%t_y = random_function(iran_agent) * &
920	(ny+1)*dy
921	ENDIF
922	!
923	!-- Agent gets target of her group
924	ELSE
925	tmp_agent%t_x = at_x(i)
926	tmp_agent%t_y = at_y(i)
927	ENDIF
928
929	local_count(jp,ip) = local_count(jp,ip) + 1
930
931	IF ( .NOT. first_stride ) THEN
932	grid_agents(jp,ip)%agents(local_count(jp,ip)) &
933	= tmp_agent
934	ENDIF
935
936	ENDIF
937
938	pos_x = pos_x + adx(i)
939
940	ENDDO xloop
941
942	ENDIF
943
944	pos_y = pos_y + ady(i)
945
946	ENDDO
947
948	ENDDO
949
950	!
951	!-- Allocate or reallocate agents array to new size
952	IF ( first_stride ) THEN
953	DO ip = nxlg, nxrg
954	DO jp = nysg, nyng
955	IF ( phase == PHASE_INIT ) THEN
956	IF ( local_count(jp,ip) > 0 ) THEN
957	alloc_size = MAX( INT( local_count(jp,ip) * &
958	( 1.0_wp + alloc_factor_mas / 100.0_wp ) ), &
959	min_nr_agent )
960	ELSE
961	alloc_size = min_nr_agent
962	ENDIF
963	ALLOCATE(grid_agents(jp,ip)%agents(1:alloc_size))
964	DO n = 1, alloc_size
965	grid_agents(jp,ip)%agents(n) = zero_agent
966	ENDDO
967	ELSEIF ( phase == PHASE_RELEASE ) THEN
968	IF ( local_count(jp,ip) > 0 ) THEN
969	new_size = local_count(jp,ip) + agt_count(jp,ip)
970	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
971	alloc_factor_mas / 100.0_wp ) ), min_nr_agent )
972	IF( alloc_size > SIZE( grid_agents(jp,ip)%agents) ) &
973	THEN
974	CALL mas_eh_realloc_agents_array(ip,jp,alloc_size)
975	ENDIF
976	ENDIF
977	ENDIF
978	ENDDO
979	ENDDO
980	ENDIF
981
982	ENDDO
983
984	local_start = agt_count+1
985	agt_count = local_count
986
987	!
988	!-- Calculate agent IDs
989	DO ip = nxl, nxr
990	DO jp = nys, nyn
991	number_of_agents = agt_count(jp,ip)
992	IF ( number_of_agents <= 0 ) CYCLE
993	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
994
995	DO n = local_start(jp,ip), number_of_agents !only new agents
996
997	agents(n)%id = 10000_idp*2 grid_agents(jp,ip)%id_counter + &
998	10000_idp * jp + ip
999	!
1000	!-- Count the number of agents that have been released before
1001	grid_agents(jp,ip)%id_counter = grid_agents(jp,ip)%id_counter &
1002	+ 1
1003
1004	ENDDO
1005
1006	ENDDO
1007	ENDDO
1008
1009	!
1010	!-- Add random fluctuation to agent positions.
1011	IF ( random_start_position_agents ) THEN
1012	DO ip = nxl, nxr
1013	DO jp = nys, nyn
1014	number_of_agents = agt_count(jp,ip)
1015	IF ( number_of_agents <= 0 ) CYCLE
1016	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1017	!
1018	!-- Move only new agents. Moreover, limit random fluctuation
1019	!-- in order to prevent that agents move more than one grid box,
1020	!-- which would lead to problems concerning agent exchange
1021	!-- between processors in case adx/ady are larger than dx/dy,
1022	!-- respectively.
1023	DO n = local_start(jp,ip), number_of_agents
1024	IF ( asl(agents(n)%group) /= asr(agents(n)%group) ) THEN
1025	rand_contr = ( random_function( iran_agent ) - 0.5_wp ) *&
1026	adx(agents(n)%group)
1027	agents(n)%x = agents(n)%x + &
1028	MERGE( rand_contr, SIGN( dx, rand_contr ), &
1029	ABS( rand_contr ) < dx &
1030	)
1031	ENDIF
1032	IF ( ass(agents(n)%group) /= asn(agents(n)%group) ) THEN
1033	rand_contr = ( random_function( iran_agent ) - 0.5_wp ) *&
1034	ady(agents(n)%group)
1035	agents(n)%y = agents(n)%y + &
1036	MERGE( rand_contr, SIGN( dy, rand_contr ), &
1037	ABS( rand_contr ) < dy )
1038	ENDIF
1039	ENDDO
1040	!
1041	!-- Delete agents that have been simulated longer than allowed
1042	CALL mas_boundary_conds( 'max_sim_time' )
1043	!
1044	!-- Delete agents that have reached target area
1045	CALL mas_boundary_conds( 'target_area' )
1046
1047	ENDDO
1048	ENDDO
1049	!
1050	!-- Exchange agents between grid cells and processors
1051	CALL mas_eh_move_agent
1052	CALL mas_eh_exchange_horiz
1053
1054	ENDIF
1055	!
1056	!-- In case of random_start_position_agents, delete agents identified by
1057	!-- mas_eh_exchange_horiz and mas_boundary_conds. Then sort agents into
1058	!-- blocks, which is needed for a fast interpolation of the LES fields
1059	!-- on the agent position.
1060	CALL mas_ps_sort_in_subboxes
1061
1062	!
1063	!-- Determine the current number of agents
1064	number_of_agents = 0
1065	DO ip = nxl, nxr
1066	DO jp = nys, nyn
1067	number_of_agents = number_of_agents + agt_count(jp,ip)
1068	ENDDO
1069	ENDDO
1070	!
1071	!-- Calculate the number of agents of the total domain
1072	#if defined( __parallel )
1073	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1074	CALL MPI_ALLREDUCE( number_of_agents, total_number_of_agents, 1, &
1075	MPI_INTEGER, MPI_SUM, comm2d, ierr )
1076	#else
1077	total_number_of_agents = number_of_agents
1078	#endif
1079
1080	RETURN
1081
1082	END SUBROUTINE mas_create_agent
1083
1084	!------------------------------------------------------------------------------!
1085	! Description:
1086	! ------------
1087	!> Creates flags that indicate if a gridbox contains edges or corners. These
1088	!> flags are used for agents to check if obstacles are close to them.
1089	!------------------------------------------------------------------------------!
1090	SUBROUTINE mas_create_obstacle_flags
1091
1092	USE arrays_3d, &
1093	ONLY: zw
1094
1095	IMPLICIT NONE
1096
1097	INTEGER(iwp) :: il
1098	INTEGER(iwp) :: jl
1099
1100	ALLOCATE(obstacle_flags(nysg:nyng,nxlg:nxrg))
1101
1102	obstacle_flags = 0
1103
1104	DO il = nxlg, nxrg
1105	DO jl = nysg, nyng
1106	!
1107	!-- Exclude cyclic topography boundary
1108	IF ( il < 0 .OR. il > nx .OR. jl < 0 .OR. jl > ny ) CYCLE
1109	!
1110	!-- North edge
1111	IF ( jl < nyng ) THEN
1112	IF ( ( top_top_s(jl,il) - top_top_s(jl+1,il) ) > 1 .AND. &
1113	( zw( top_top_w(jl,il) ) - &
1114	zw( top_top_w(jl+1,il) ) ) > .51_wp ) &
1115	THEN
1116	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 0 )
1117	ENDIF
1118	ENDIF
1119	!
1120	!-- North right corner
1121	IF ( jl < nyng .AND. il < nxrg ) THEN
1122	IF ( ( top_top_s(jl,il) - top_top_s(jl+1,il) ) > 1 .AND. &
1123	( top_top_s(jl,il) - top_top_s(jl+1,il+1) ) > 1 .AND. &
1124	( top_top_s(jl,il) - top_top_s(jl,il+1) ) > 1 .AND. &
1125	( zw( top_top_w(jl,il) ) - &
1126	zw( top_top_w(jl+1,il+1) ) ) > .51_wp ) &
1127	THEN
1128	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 1 )
1129	ENDIF
1130	ENDIF
1131	!
1132	!-- Right edge
1133	IF ( il < nxrg ) THEN
1134	IF ( ( top_top_s(jl,il) - top_top_s(jl,il+1) ) > 1 .AND. &
1135	( zw( top_top_w(jl,il) ) - &
1136	zw( top_top_w(jl,il+1) ) ) > .51_wp ) &
1137	THEN
1138	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 2 )
1139	ENDIF
1140	ENDIF
1141	!
1142	!-- South right corner
1143	IF ( jl > nysg .AND. il < nxrg ) THEN
1144	IF ( ( top_top_s(jl,il) - top_top_s(jl,il+1) ) > 1 .AND. &
1145	( top_top_s(jl,il) - top_top_s(jl-1,il+1) ) > 1 .AND. &
1146	( top_top_s(jl,il) - top_top_s(jl-1,il) ) > 1 .AND. &
1147	( zw(top_top_w(jl,il)) - &
1148	zw( top_top_w(jl-1,il+1) ) ) > .51_wp ) &
1149	THEN
1150	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 3 )
1151	ENDIF
1152	ENDIF
1153	!
1154	!-- South edge
1155	IF ( jl > nysg ) THEN
1156	IF ( ( top_top_s(jl,il) - top_top_s(jl-1,il) ) > 1 .AND. &
1157	( zw( top_top_w(jl,il) ) - &
1158	zw( top_top_w(jl-1,il) ) ) > .51_wp ) &
1159	THEN
1160	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 4 )
1161	ENDIF
1162	ENDIF
1163	!
1164	!-- South left corner
1165	IF ( jl > nysg .AND. il > nxlg ) THEN
1166	IF ( ( top_top_s(jl,il) - top_top_s(jl-1,il) ) > 1 .AND. &
1167	( top_top_s(jl,il) - top_top_s(jl-1,il-1) ) > 1 .AND. &
1168	( top_top_s(jl,il) - top_top_s(jl,il-1) ) > 1 .AND. &
1169	( zw( top_top_w(jl,il) ) - &
1170	zw(top_top_w(jl-1,il-1) ) ) > .51_wp ) &
1171	THEN
1172	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 5 )
1173	ENDIF
1174	ENDIF
1175	!
1176	!-- Left edge
1177	IF ( il > nxlg ) THEN
1178	IF ( ( top_top_s(jl,il) - top_top_s(jl,il-1) ) > 1 .AND. &
1179	( zw(top_top_w(jl,il) ) - &
1180	zw(top_top_w(jl,il-1) ) ) > .51_wp ) &
1181	THEN
1182	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 6 )
1183	ENDIF
1184	ENDIF
1185	!
1186	!-- North left corner
1187	IF ( jl < nyng .AND. il > nxlg ) THEN
1188	IF ( ( top_top_s(jl,il) - top_top_s(jl,il-1) ) > 1 .AND. &
1189	( top_top_s(jl,il) - top_top_s(jl+1,il-1) ) > 1 .AND. &
1190	( top_top_s(jl,il) - top_top_s(jl+1,il) ) > 1 .AND. &
1191	( zw( top_top_w(jl,il) ) - &
1192	zw( top_top_w(jl+1,il-1) ) ) > .51_wp ) &
1193	THEN
1194	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 7 )
1195	ENDIF
1196	ENDIF
1197
1198	ENDDO
1199	ENDDO
1200
1201	END SUBROUTINE mas_create_obstacle_flags
1202
1203	!------------------------------------------------------------------------------!
1204	! Description:
1205	! ------------
1206	!> Write agent data in netCDF format
1207	!------------------------------------------------------------------------------!
1208	SUBROUTINE mas_data_output_agents( ftest )
1209
1210	USE control_parameters, &
1211	ONLY: agt_time_count, biometeorology, end_time, message_string, &
1212	multi_agent_system_end, multi_agent_system_start
1213
1214	USE netcdf_interface, &
1215	ONLY: nc_stat, id_set_agt, id_var_time_agt, &
1216	id_var_agt, netcdf_handle_error
1217
1218	USE pegrid
1219
1220	#if defined( __netcdf )
1221	USE NETCDF
1222	#endif
1223	USE mas_global_attributes, &
1224	ONLY: dim_size_agtnum
1225
1226	IMPLICIT NONE
1227
1228	#if defined( __parallel )
1229	INTEGER(iwp) :: agt_size !< Agent size in bytes
1230	INTEGER(iwp) :: n !< counter (number of PEs)
1231	INTEGER(iwp) :: noa_rcv !< received number of agents
1232	#endif
1233	INTEGER(iwp) :: dummy !< dummy
1234	INTEGER(iwp) :: ii !< counter (x)
1235	INTEGER(iwp) :: ip !< counter (x)
1236	INTEGER(iwp) :: jp !< counter (y)
1237	INTEGER(iwp) :: noa !< number of agents
1238	INTEGER(iwp) :: out_noa !< number of agents for output
1239
1240	#if defined( __parallel )
1241	INTEGER(iwp), DIMENSION(0:numprocs-1) :: noa_arr !< number of agents on each PE
1242	#endif
1243	!
1244	!-- SAVE attribute required to avoid compiler warning about pointer outlive the pointer target
1245	TYPE(agent_type), DIMENSION(:), ALLOCATABLE, TARGET, SAVE :: trf_agents !< all agents on current PE
1246	#if defined( __parallel )
1247	TYPE(agent_type), DIMENSION(:), ALLOCATABLE, TARGET, SAVE :: out_agents !< all agents in entire domain
1248	#endif
1249
1250	LOGICAL, INTENT (INOUT) :: ftest
1251
1252	LOGICAL, SAVE :: agt_dimension_exceeded = .FALSE.
1253
1254	CALL cpu_log( log_point_s(17), 'mas_data_output', 'start' )
1255	!
1256	!-- Get total number of agents and put all agents on one PE in one array
1257	noa = 0
1258	DO ip = nxl, nxr
1259	DO jp = nys, nyn
1260	noa = noa + agt_count(jp,ip)
1261	ENDDO
1262	ENDDO
1263	IF(noa > 0) THEN
1264	ALLOCATE(trf_agents(1:noa))
1265	dummy = 1
1266	DO ip = nxl, nxr
1267	DO jp = nys, nyn
1268	IF ( agt_count(jp,ip) == 0 ) CYCLE
1269	agents => grid_agents(jp,ip)%agents(1:agt_count(jp,ip))
1270	trf_agents(dummy:(dummy-1+agt_count(jp,ip))) = agents
1271	dummy = dummy + agt_count(jp,ip)
1272	ENDDO
1273	ENDDO
1274	ENDIF
1275	#if defined( __parallel )
1276	!
1277	!-- Gather all agents on PE0 for output
1278	IF ( myid == 0 ) THEN
1279	noa_arr(0) = noa
1280	!
1281	!-- Receive data from all other PEs.
1282	DO n = 1, numprocs-1
1283	CALL MPI_RECV( noa_arr(n), 1, MPI_INTEGER, &
1284	n, 0, comm2d, status, ierr )
1285	ENDDO
1286	ELSE
1287	CALL MPI_SEND( noa, 1, MPI_INTEGER, 0, 0, comm2d, ierr )
1288	ENDIF
1289	CALL MPI_BARRIER( comm2d, ierr )
1290	agt_size = STORAGE_SIZE(zero_agent)/8
1291	IF ( myid == 0 ) THEN
1292	!
1293	!-- Receive data from all other PEs.
1294	out_noa = SUM(noa_arr)
1295	IF ( out_noa > 0 ) THEN
1296	ALLOCATE( out_agents(1:out_noa) )
1297	IF ( noa > 0 ) THEN
1298	out_agents(1:noa) = trf_agents
1299	ENDIF
1300	noa_rcv = noa
1301	DO n = 1, numprocs-1
1302	IF ( noa_arr(n) > 0 ) THEN
1303	CALL MPI_RECV( out_agents(noa_rcv+1), noa_arr(n)*agt_size, &
1304	MPI_BYTE, n, 0, comm2d, status, ierr )
1305	noa_rcv = noa_rcv + noa_arr(n)
1306	ENDIF
1307	ENDDO
1308	ELSE
1309	ALLOCATE( out_agents(1:2) )
1310	out_agents = zero_agent
1311	out_noa = 2
1312	ENDIF
1313	ELSE
1314	IF ( noa > 0 ) THEN
1315	CALL MPI_SEND( trf_agents(1), noa*agt_size, MPI_BYTE, 0, 0, &
1316	comm2d, ierr )
1317	ENDIF
1318	ENDIF
1319	!
1320	!-- A barrier has to be set, because otherwise some PEs may
1321	!-- proceed too fast so that PE0 may receive wrong data on
1322	!-- tag 0
1323	CALL MPI_BARRIER( comm2d, ierr )
1324	#endif
1325	IF ( myid == 0 ) THEN
1326	#if defined( __parallel )
1327	agents => out_agents
1328	#else
1329	agents => trf_agents
1330	#endif
1331
1332	#if defined( __netcdf )
1333	!
1334	!-- Update maximum number of agents
1335	maximum_number_of_agents = MAX(maximum_number_of_agents, out_noa)
1336	!
1337	!-- Output in netCDF format
1338	IF ( ftest ) THEN
1339	!
1340	!-- First, define size of agent number dimension from amount of agents
1341	!-- released, release interval, time of agent simulation and max
1342	!-- age of agents
1343	dim_size_agtnum = MIN( MIN( multi_agent_system_end, end_time ) &
1344	- multi_agent_system_start, &
1345	agent_maximum_age)
1346
1347	DO ii = 1, number_of_agent_groups
1348	dim_size_agtnum = dim_size_agtnum &
1349	+ (FLOOR( ( asr(ii)-asl(ii) ) / adx(ii) ) + 1) &
1350	* (FLOOR( ( asn(ii)-ass(ii) ) / ady(ii) ) + 1) &
1351	* (FLOOR( dim_size_agtnum / dt_arel ) + 1) &
1352	* dim_size_factor_agtnum
1353	dim_size_agtnum = MIN( dim_size_agtnum, dim_size_agtnum_manual )
1354	ENDDO
1355	CALL check_open( 118 )
1356	ENDIF
1357
1358	!
1359	!-- Update the NetCDF time axis
1360	agt_time_count = agt_time_count + 1
1361
1362	IF ( .NOT. agt_dimension_exceeded ) THEN
1363	!
1364	!-- if number of agents to be output exceeds dimension, set flag and
1365	!-- print warning
1366	IF ( out_noa > dim_size_agtnum ) THEN
1367
1368	agt_dimension_exceeded = .TRUE.
1369	WRITE(message_string,'(A,F11.1,2(A,I8))') &
1370	'Number of agents exceeds agent dimension.' // &
1371	'&Starting at time_since_reference_point = ', &
1372	time_since_reference_point, &
1373	' s, &data may be missing.'// &
1374	'&Number of agents: ', out_noa, &
1375	'&Agent dimension size: ', dim_size_agtnum
1376
1377	CALL message( 'mas_data_output_agents', &
1378	'PA0420', 0, 1, 0, 6, 0 )
1379
1380	ENDIF
1381	ENDIF
1382
1383	!
1384	!-- reduce number of output agents to dimension size, if necessary
1385	IF ( agt_dimension_exceeded ) THEN
1386
1387	out_noa = MIN( out_noa, dim_size_agtnum )
1388
1389	ENDIF
1390
1391	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_time_agt, &
1392	(/ time_since_reference_point + agent_substep_time /), &
1393	start = (/ agt_time_count /), &
1394	count = (/ 1 /) )
1395	CALL netcdf_handle_error( 'mas_data_output_agents', 1 )
1396
1397	!
1398	!-- Output agent attributes
1399
1400	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(1), agents%id, &
1401	start = (/ 1, agt_time_count /), &
1402	count = (/ out_noa /) )
1403	CALL netcdf_handle_error( 'mas_data_output_agents', 2 )
1404
1405	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(2), agents%x, &
1406	start = (/ 1, agt_time_count /), &
1407	count = (/ out_noa /) )
1408	CALL netcdf_handle_error( 'mas_data_output_agents', 3 )
1409
1410	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(3), agents%y, &
1411	start = (/ 1, agt_time_count /), &
1412	count = (/ out_noa /) )
1413	CALL netcdf_handle_error( 'mas_data_output_agents', 4 )
1414
1415	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(4), agents%windspeed, &
1416	start = (/ 1, agt_time_count /), &
1417	count = (/ out_noa /) )
1418	CALL netcdf_handle_error( 'mas_data_output_agents', 5 )
1419
1420	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(5), agents%t, &
1421	start = (/ 1, agt_time_count /), &
1422	count = (/ out_noa /) )
1423	CALL netcdf_handle_error( 'mas_data_output_agents', 6 )
1424
1425	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(6), agents%group, &
1426	start = (/ 1, agt_time_count /), &
1427	count = (/ out_noa /) )
1428	CALL netcdf_handle_error( 'mas_data_output_agents', 7 )
1429
1430
1431	IF ( biometeorology ) THEN
1432	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(7), agents%ipt, &
1433	start = (/ 1, agt_time_count /), &
1434	count = (/ out_noa /) )
1435	CALL netcdf_handle_error( 'mas_data_output_agents', 8 )
1436	ENDIF
1437
1438
1439
1440	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(8), agents%pm10, &
1441	! start = (/ 1, agt_time_count /), &
1442	! count = (/ out_noa /) )
1443	! CALL netcdf_handle_error( 'mas_data_output_agents', 9 )
1444	!
1445	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(9), agents%pm25, &
1446	! start = (/ 1, agt_time_count /), &
1447	! count = (/ out_noa /) )
1448	! CALL netcdf_handle_error( 'mas_data_output_agents', 10 )
1449	!
1450	!
1451	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(9), agents%uv, &
1452	! start = (/ 1, agt_time_count /), &
1453	! count = (/ out_noa /) )
1454	! CALL netcdf_handle_error( 'mas_data_output_agents', 10 )
1455
1456	CALL cpu_log( log_point_s(17), 'mas_data_output', 'stop' )
1457
1458
1459	#endif
1460
1461	#if defined( __parallel )
1462	IF ( ALLOCATED( out_agents ) ) DEALLOCATE( out_agents )
1463	#endif
1464	ELSE
1465	CALL cpu_log( log_point_s(17), 'mas_data_output', 'stop' )
1466	ENDIF
1467
1468	IF ( ALLOCATED( trf_agents ) ) DEALLOCATE( trf_agents )
1469
1470	END SUBROUTINE mas_data_output_agents
1471
1472	#if defined( __parallel )
1473	!------------------------------------------------------------------------------!
1474	! Description:
1475	! ------------
1476	!> If an agent moves from one processor to another, this subroutine moves
1477	!> the corresponding elements from the agent arrays of the old grid cells
1478	!> to the agent arrays of the new grid cells.
1479	!------------------------------------------------------------------------------!
1480	SUBROUTINE mas_eh_add_agents_to_gridcell (agent_array)
1481
1482	IMPLICIT NONE
1483
1484	INTEGER(iwp) :: aindex !< dummy argument for new number of agents per grid box
1485	INTEGER(iwp) :: ip !< grid index (x) of agent
1486	INTEGER(iwp) :: jp !< grid index (x) of agent
1487	INTEGER(iwp) :: n !< index variable of agent
1488
1489	LOGICAL :: pack_done !< flag to indicate that packing is done
1490
1491	TYPE(agent_type), DIMENSION(:), INTENT(IN) :: agent_array !< new agents in a grid box
1492	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: temp_ns !< temporary agent array for reallocation
1493
1494	pack_done = .FALSE.
1495
1496	DO n = 1, SIZE(agent_array)
1497
1498	IF ( .NOT. agent_array(n)%agent_mask ) CYCLE
1499
1500	ip = agent_array(n)%x * ddx
1501	jp = agent_array(n)%y * ddy
1502
1503	IF ( ip >= nxl .AND. ip <= nxr .AND. &
1504	jp >= nys .AND. jp <= nyn ) &
1505	THEN ! agent stays on processor
1506	number_of_agents = agt_count(jp,ip)
1507	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1508
1509	aindex = agt_count(jp,ip)+1
1510	IF( aindex > SIZE(grid_agents(jp,ip)%agents) ) THEN
1511	IF ( pack_done ) THEN
1512	CALL mas_eh_realloc_agents_array (ip,jp)
1513	ELSE
1514	CALL mas_ps_pack
1515	agt_count(jp,ip) = number_of_agents
1516	aindex = agt_count(jp,ip)+1
1517	IF ( aindex > SIZE(grid_agents(jp,ip)%agents) ) THEN
1518	CALL mas_eh_realloc_agents_array (ip,jp)
1519	ENDIF
1520	pack_done = .TRUE.
1521	ENDIF
1522	ENDIF
1523	grid_agents(jp,ip)%agents(aindex) = agent_array(n)
1524	agt_count(jp,ip) = aindex
1525	ELSE
1526	IF ( jp <= nys - 1 ) THEN
1527	nr_move_south = nr_move_south+1
1528	!
1529	!-- Before agent information is swapped to exchange-array, check
1530	!-- if enough memory is allocated. If required, reallocate exchange
1531	!-- array.
1532	IF ( nr_move_south > SIZE(move_also_south) ) THEN
1533	!
1534	!-- At first, allocate further temporary array to swap agent
1535	!-- information.
1536	ALLOCATE( temp_ns(SIZE(move_also_south)+NR_2_direction_move))
1537	temp_ns(1:nr_move_south-1) = move_also_south &
1538	(1:nr_move_south-1)
1539	DEALLOCATE( move_also_south )
1540	ALLOCATE( move_also_south(SIZE(temp_ns)) )
1541	move_also_south(1:nr_move_south-1) = temp_ns &
1542	(1:nr_move_south-1)
1543	DEALLOCATE( temp_ns )
1544
1545	ENDIF
1546
1547	move_also_south(nr_move_south) = agent_array(n)
1548
1549	IF ( jp == -1 ) THEN
1550	!
1551	!-- Apply boundary condition along y
1552	IF ( ibc_mas_ns == 0 ) THEN
1553	move_also_south(nr_move_south)%y = &
1554	move_also_south(nr_move_south)%y &
1555	+ ( ny + 1 ) * dy
1556	move_also_south(nr_move_south)%origin_y = &
1557	move_also_south(nr_move_south)%origin_y &
1558	+ ( ny + 1 ) * dy
1559	ELSEIF ( ibc_mas_ns == 1 ) THEN
1560	!
1561	!-- Agent absorption
1562	move_also_south(nr_move_south)%agent_mask = .FALSE.
1563	deleted_agents = deleted_agents + 1
1564
1565	ENDIF
1566	ENDIF
1567	ELSEIF ( jp >= nyn+1 ) THEN
1568	nr_move_north = nr_move_north+1
1569	!
1570	!-- Before agent information is swapped to exchange-array, check
1571	!-- if enough memory is allocated. If required, reallocate exchange
1572	!-- array.
1573	IF ( nr_move_north > SIZE(move_also_north) ) THEN
1574	!
1575	!-- At first, allocate further temporary array to swap agent
1576	!-- information.
1577	ALLOCATE( temp_ns(SIZE(move_also_north)+NR_2_direction_move))
1578	temp_ns(1:nr_move_north-1) = &
1579	move_also_south(1:nr_move_north-1)
1580	DEALLOCATE( move_also_north )
1581	ALLOCATE( move_also_north(SIZE(temp_ns)) )
1582	move_also_north(1:nr_move_north-1) = &
1583	temp_ns(1:nr_move_north-1)
1584	DEALLOCATE( temp_ns )
1585
1586	ENDIF
1587
1588	move_also_north(nr_move_north) = agent_array(n)
1589	IF ( jp == ny+1 ) THEN
1590	!
1591	!-- Apply boundary condition along y
1592	IF ( ibc_mas_ns == 0 ) THEN
1593
1594	move_also_north(nr_move_north)%y = &
1595	move_also_north(nr_move_north)%y &
1596	- ( ny + 1 ) * dy
1597	move_also_north(nr_move_north)%origin_y = &
1598	move_also_north(nr_move_north)%origin_y &
1599	- ( ny + 1 ) * dy
1600	ELSEIF ( ibc_mas_ns == 1 ) THEN
1601	!
1602	!-- Agent absorption
1603	move_also_north(nr_move_north)%agent_mask = .FALSE.
1604	deleted_agents = deleted_agents + 1
1605
1606	ENDIF
1607	ENDIF
1608	ENDIF
1609	ENDIF
1610	ENDDO
1611
1612	RETURN
1613
1614	END SUBROUTINE mas_eh_add_agents_to_gridcell
1615	#endif
1616
1617
1618	#if defined( __parallel )
1619	!------------------------------------------------------------------------------!
1620	! Description:
1621	! ------------
1622	!> After ghost layer agents have been received from neighboring PEs, this
1623	!> subroutine sorts them into the corresponding grid cells
1624	!------------------------------------------------------------------------------!
1625	SUBROUTINE mas_eh_add_ghost_agents_to_gridcell (agent_array)
1626
1627	IMPLICIT NONE
1628
1629	INTEGER(iwp) :: ip !< grid index (x) of agent
1630	INTEGER(iwp) :: jp !< grid index (x) of agent
1631	INTEGER(iwp) :: n !< index variable of agent
1632	INTEGER(iwp) :: aindex !< dummy argument for new number of agents per grid box
1633
1634	LOGICAL :: pack_done !< flag to indicate that packing is done
1635
1636	TYPE(agent_type), DIMENSION(:), INTENT(IN) :: agent_array !< new agents in a grid box
1637
1638	pack_done = .FALSE.
1639
1640	DO n = 1, SIZE(agent_array)
1641
1642	IF ( .NOT. agent_array(n)%agent_mask ) CYCLE
1643
1644	ip = agent_array(n)%x * ddx
1645	jp = agent_array(n)%y * ddy
1646
1647	IF ( ip < nxl .OR. ip > nxr .OR. jp < nys .OR. jp > nyn ) THEN
1648	number_of_agents = agt_count(jp,ip)
1649	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1650
1651	aindex = agt_count(jp,ip)+1
1652	IF( aindex > SIZE(grid_agents(jp,ip)%agents) ) THEN
1653	IF ( pack_done ) THEN
1654	CALL mas_eh_realloc_agents_array (ip,jp)
1655	ELSE
1656	CALL mas_ps_pack
1657	agt_count(jp,ip) = number_of_agents
1658	aindex = agt_count(jp,ip)+1
1659	IF ( aindex > SIZE(grid_agents(jp,ip)%agents) ) THEN
1660	CALL mas_eh_realloc_agents_array (ip,jp)
1661	ENDIF
1662	pack_done = .TRUE.
1663	ENDIF
1664	ENDIF
1665	grid_agents(jp,ip)%agents(aindex) = agent_array(n)
1666	agt_count(jp,ip) = aindex
1667	ENDIF
1668	ENDDO
1669	END SUBROUTINE mas_eh_add_ghost_agents_to_gridcell
1670	#endif
1671
1672	!------------------------------------------------------------------------------!
1673	! Description:
1674	! ------------
1675	!> Resizing of agent arrays
1676	!------------------------------------------------------------------------------!
1677	SUBROUTINE mas_eh_dealloc_agents_array
1678
1679	IMPLICIT NONE
1680
1681	INTEGER(iwp) :: i !< grid index (x) of agent
1682	INTEGER(iwp) :: j !< grid index (y) of agent
1683	INTEGER(iwp) :: old_size !< old array size
1684	INTEGER(iwp) :: new_size !< new array size
1685	INTEGER(iwp) :: noa !< number of agents
1686
1687	LOGICAL :: dealloc !< flag that indicates if reallocation is necessary
1688
1689	TYPE(agent_type), DIMENSION(10) :: tmp_agents_s !< temporary static agent array
1690
1691	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: tmp_agents_d !< temporary dynamic agent array
1692
1693	DO i = nxlg, nxrg
1694	DO j = nysg, nyng
1695	!
1696	!-- Determine number of active agents
1697	noa = agt_count(j,i)
1698	!
1699	!-- Determine allocated memory size
1700	old_size = SIZE( grid_agents(j,i)%agents )
1701	!
1702	!-- Check for large unused memory
1703	dealloc = ( ( noa < min_nr_agent .AND. old_size > min_nr_agent ) &
1704	.OR. ( noa > min_nr_agent .AND. old_size - noa * &
1705	( 1.0_wp + 0.01_wp * alloc_factor_mas ) > 0.0_wp ) )
1706	!
1707	!-- If large unused memory was found, resize the corresponding array
1708	IF ( dealloc ) THEN
1709	IF ( noa < min_nr_agent ) THEN
1710	new_size = min_nr_agent
1711	ELSE
1712	new_size = INT( noa * ( 1.0_wp + &
1713	0.01_wp * alloc_factor_mas ) )
1714	ENDIF
1715
1716	IF ( noa <= 10 ) THEN
1717
1718	tmp_agents_s(1:noa) = grid_agents(j,i)%agents(1:noa)
1719
1720	DEALLOCATE(grid_agents(j,i)%agents)
1721	ALLOCATE(grid_agents(j,i)%agents(1:new_size))
1722
1723	grid_agents(j,i)%agents(1:noa) = tmp_agents_s(1:noa)
1724	grid_agents(j,i)%agents(noa+1:new_size) = zero_agent
1725
1726	ELSE
1727
1728	ALLOCATE(tmp_agents_d(noa))
1729	tmp_agents_d(1:noa) = grid_agents(j,i)%agents(1:noa)
1730
1731	DEALLOCATE(grid_agents(j,i)%agents)
1732	ALLOCATE(grid_agents(j,i)%agents(new_size))
1733
1734	grid_agents(j,i)%agents(1:noa) = tmp_agents_d(1:noa)
1735	grid_agents(j,i)%agents(noa+1:new_size) = zero_agent
1736
1737	DEALLOCATE(tmp_agents_d)
1738
1739	ENDIF
1740
1741	ENDIF
1742	ENDDO
1743	ENDDO
1744
1745	END SUBROUTINE mas_eh_dealloc_agents_array
1746
1747	!------------------------------------------------------------------------------!
1748	! Description:
1749	! ------------
1750	!> Exchange between subdomains.
1751	!> As soon as one agent has moved beyond the boundary of the domain, it
1752	!> is included in the relevant transfer arrays and marked for subsequent
1753	!> deletion on this PE.
1754	!> First sweep for crossings in x direction. Find out first the number of
1755	!> agents to be transferred and allocate temporary arrays needed to store
1756	!> them.
1757	!> For a one-dimensional decomposition along y, no transfer is necessary,
1758	!> because the agent remains on the PE, but the agent coordinate has to
1759	!> be adjusted.
1760	!------------------------------------------------------------------------------!
1761	SUBROUTINE mas_eh_exchange_horiz
1762
1763	IMPLICIT NONE
1764
1765	INTEGER(iwp) :: ip !< index variable along x
1766	INTEGER(iwp) :: jp !< index variable along y
1767	INTEGER(iwp) :: n !< agent index variable
1768
1769	#if defined( __parallel )
1770
1771	INTEGER(iwp) :: i !< grid index (x) of agent positition
1772	INTEGER(iwp) :: j !< grid index (y) of agent positition
1773	INTEGER(iwp) :: par_size !< Agent size in bytes
1774
1775	INTEGER(iwp) :: trla_count !< number of agents send to left PE
1776	INTEGER(iwp) :: trla_count_recv !< number of agents receive from right PE
1777	INTEGER(iwp) :: trna_count !< number of agents send to north PE
1778	INTEGER(iwp) :: trna_count_recv !< number of agents receive from south PE
1779	INTEGER(iwp) :: trra_count !< number of agents send to right PE
1780	INTEGER(iwp) :: trra_count_recv !< number of agents receive from left PE
1781	INTEGER(iwp) :: trsa_count !< number of agents send to south PE
1782	INTEGER(iwp) :: trsa_count_recv !< number of agents receive from north PE
1783
1784	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvla !< agents received from right PE
1785	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvna !< agents received from south PE
1786	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvra !< agents received from left PE
1787	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvsa !< agents received from north PE
1788	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trla !< agents send to left PE
1789	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trna !< agents send to north PE
1790	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trra !< agents send to right PE
1791	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trsa !< agents send to south PE
1792
1793	!
1794	!-- Exchange between subdomains.
1795	!-- As soon as one agent has moved beyond the boundary of the domain, it
1796	!-- is included in the relevant transfer arrays and marked for subsequent
1797	!-- deletion on this PE.
1798	!-- First sweep for crossings in x direction. Find out first the number of
1799	!-- agents to be transferred and allocate temporary arrays needed to store
1800	!-- them.
1801	!-- For a one-dimensional decomposition along y, no transfer is necessary,
1802	!-- because the agent remains on the PE, but the agent coordinate has to
1803	!-- be adjusted.
1804	trla_count = 0
1805	trra_count = 0
1806
1807	trla_count_recv = 0
1808	trra_count_recv = 0
1809
1810	IF ( pdims(1) /= 1 ) THEN
1811	!
1812	!-- First calculate the storage necessary for sending and receiving the data.
1813	!-- Compute only first (nxl) and last (nxr) loop iterration.
1814	DO ip = nxl, nxr, nxr - nxl
1815	DO jp = nys, nyn
1816
1817	number_of_agents = agt_count(jp,ip)
1818	IF ( number_of_agents <= 0 ) CYCLE
1819	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1820	DO n = 1, number_of_agents
1821	IF ( agents(n)%agent_mask ) THEN
1822	i = agents(n)%x * ddx
1823	!
1824	!-- Above calculation does not work for indices less than zero
1825	IF ( agents(n)%x < 0.0_wp ) i = -1
1826
1827	IF ( i < nxl ) THEN
1828	trla_count = trla_count + 1
1829	ELSEIF ( i > nxr ) THEN
1830	trra_count = trra_count + 1
1831	ENDIF
1832	ENDIF
1833	ENDDO
1834
1835	ENDDO
1836	ENDDO
1837
1838	IF ( trla_count == 0 ) trla_count = 1
1839	IF ( trra_count == 0 ) trra_count = 1
1840
1841	ALLOCATE( trla(trla_count), trra(trra_count) )
1842
1843	trla = zero_agent
1844	trra = zero_agent
1845
1846	trla_count = 0
1847	trra_count = 0
1848
1849	ENDIF
1850	!
1851	!-- Compute only first (nxl) and last (nxr) loop iterration
1852	DO ip = nxl, nxr, nxr-nxl
1853	DO jp = nys, nyn
1854	number_of_agents = agt_count(jp,ip)
1855	IF ( number_of_agents <= 0 ) CYCLE
1856	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1857	DO n = 1, number_of_agents
1858	!
1859	!-- Only those agents that have not been marked as 'deleted' may
1860	!-- be moved.
1861	IF ( agents(n)%agent_mask ) THEN
1862
1863	i = agents(n)%x * ddx
1864	!
1865	!-- Above calculation does not work for indices less than zero
1866	IF ( agents(n)%x < 0.0_wp ) i = -1
1867
1868	IF ( i < nxl ) THEN
1869	IF ( i < 0 ) THEN
1870	!
1871	!-- Apply boundary condition along x
1872	IF ( ibc_mas_lr == 0 ) THEN
1873	!
1874	!-- Cyclic condition
1875	IF ( pdims(1) == 1 ) THEN
1876	agents(n)%x = ( nx + 1 ) * dx + &
1877	agents(n)%x
1878	agents(n)%origin_x = ( nx + 1 ) * dx + &
1879	agents(n)%origin_x
1880	ELSE
1881	trla_count = trla_count + 1
1882	trla(trla_count) = agents(n)
1883	trla(trla_count)%x = ( nx + 1 ) * dx + &
1884	trla(trla_count)%x
1885	trla(trla_count)%origin_x = &
1886	trla(trla_count)%origin_x + &
1887	( nx + 1 ) * dx
1888	agents(n)%agent_mask = .FALSE.
1889	deleted_agents = deleted_agents + 1
1890
1891	IF ( trla(trla_count)%x >= &
1892	(nx + 1)* dx - 1.0E-12_wp ) &
1893	THEN
1894	trla(trla_count)%x = trla(trla_count)%x - &
1895	1.0E-10_wp
1896	trla(trla_count)%origin_x = &
1897	trla(trla_count)%origin_x - 1
1898	ENDIF
1899
1900	ENDIF
1901
1902	ELSEIF ( ibc_mas_lr == 1 ) THEN
1903	!
1904	!-- Agent absorption
1905	agents(n)%agent_mask = .FALSE.
1906	deleted_agents = deleted_agents + 1
1907
1908	ENDIF
1909	ELSE
1910	!
1911	!-- Store agent data in the transfer array, which will be
1912	!-- send to the neighbouring PE
1913	trla_count = trla_count + 1
1914	trla(trla_count) = agents(n)
1915	agents(n)%agent_mask = .FALSE.
1916	deleted_agents = deleted_agents + 1
1917
1918	ENDIF
1919
1920	ELSEIF ( i > nxr ) THEN
1921	IF ( i > nx ) THEN
1922	!
1923	!-- Apply boundary condition along x
1924	IF ( ibc_mas_lr == 0 ) THEN
1925	!
1926	!-- Cyclic condition
1927	IF ( pdims(1) == 1 ) THEN
1928	agents(n)%x = agents(n)%x - ( nx + 1 ) * dx
1929	agents(n)%origin_x = agents(n)%origin_x - &
1930	( nx + 1 ) * dx
1931	ELSE
1932	trra_count = trra_count + 1
1933	trra(trra_count) = agents(n)
1934	trra(trra_count)%x = trra(trra_count)%x - &
1935	( nx + 1 ) * dx
1936	trra(trra_count)%origin_x = &
1937	trra(trra_count)%origin_x - &
1938	( nx + 1 ) * dx
1939	agents(n)%agent_mask = .FALSE.
1940	deleted_agents = deleted_agents + 1
1941
1942	ENDIF
1943
1944	ELSEIF ( ibc_mas_lr == 1 ) THEN
1945	!
1946	!-- Agent absorption
1947	agents(n)%agent_mask = .FALSE.
1948	deleted_agents = deleted_agents + 1
1949
1950	ENDIF
1951	ELSE
1952	!
1953	!-- Store agent data in the transfer array, which will be send
1954	!-- to the neighbouring PE
1955	trra_count = trra_count + 1
1956	trra(trra_count) = agents(n)
1957	agents(n)%agent_mask = .FALSE.
1958	deleted_agents = deleted_agents + 1
1959
1960	ENDIF
1961
1962	ENDIF
1963	ENDIF
1964
1965	ENDDO
1966	ENDDO
1967	ENDDO
1968
1969	!
1970	!-- Allocate arrays required for north-south exchange, as these
1971	!-- are used directly after agents are exchange along x-direction.
1972	ALLOCATE( move_also_north(1:NR_2_direction_move) )
1973	ALLOCATE( move_also_south(1:NR_2_direction_move) )
1974
1975	nr_move_north = 0
1976	nr_move_south = 0
1977	!
1978	!-- Send left boundary, receive right boundary (but first exchange how many
1979	!-- and chec if agent storage must be extended)
1980	IF ( pdims(1) /= 1 ) THEN
1981
1982	CALL MPI_SENDRECV( trla_count, 1, MPI_INTEGER, pleft, 0, &
1983	trra_count_recv, 1, MPI_INTEGER, pright, 0, &
1984	comm2d, status, ierr )
1985
1986	ALLOCATE(rvra(MAX(1,trra_count_recv)))
1987	!
1988	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
1989	!-- variables in structure agent_type (due to the calculation of par_size)
1990	par_size = STORAGE_SIZE(trla(1))/8
1991	CALL MPI_SENDRECV( trla, max(1,trla_count)*par_size, MPI_BYTE, pleft,&
1992	1, rvra, max(1,trra_count_recv)*par_size, MPI_BYTE, pright,&
1993	1, comm2d, status, ierr )
1994
1995	IF ( trra_count_recv > 0 ) THEN
1996	CALL mas_eh_add_agents_to_gridcell(rvra(1:trra_count_recv))
1997	ENDIF
1998
1999	DEALLOCATE(rvra)
2000
2001	!
2002	!-- Send right boundary, receive left boundary
2003	CALL MPI_SENDRECV( trra_count, 1, MPI_INTEGER, pright, 0, &
2004	trla_count_recv, 1, MPI_INTEGER, pleft, 0, &
2005	comm2d, status, ierr )
2006
2007	ALLOCATE(rvla(MAX(1,trla_count_recv)))
2008	!
2009	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
2010	!-- variables in structure agent_type (due to the calculation of par_size)
2011	par_size = STORAGE_SIZE(trra(1))/8
2012	CALL MPI_SENDRECV( trra, max(1,trra_count)*par_size, MPI_BYTE, &
2013	pright, 1, rvla, &
2014	max(1,trla_count_recv)*par_size, MPI_BYTE, &
2015	pleft, 1, comm2d, status, ierr )
2016
2017	IF ( trla_count_recv > 0 ) THEN
2018	CALL mas_eh_add_agents_to_gridcell(rvla(1:trla_count_recv))
2019	ENDIF
2020
2021	DEALLOCATE( rvla )
2022	DEALLOCATE( trla, trra )
2023
2024	ENDIF
2025
2026	!
2027	!-- Check whether agents have crossed the boundaries in y direction. Note
2028	!-- that this case can also apply to agents that have just been received
2029	!-- from the adjacent right or left PE.
2030	!-- Find out first the number of agents to be transferred and allocate
2031	!-- temporary arrays needed to store them.
2032	!-- For a one-dimensional decomposition along y, no transfer is necessary,
2033	!-- because the agent remains on the PE.
2034	trsa_count = nr_move_south
2035	trna_count = nr_move_north
2036
2037	trsa_count_recv = 0
2038	trna_count_recv = 0
2039
2040	IF ( pdims(2) /= 1 ) THEN
2041	!
2042	!-- First calculate the storage necessary for sending and receiving the
2043	!-- data
2044	DO ip = nxl, nxr
2045	DO jp = nys, nyn, nyn-nys !compute only first (nys) and last (nyn) loop iterration
2046	number_of_agents = agt_count(jp,ip)
2047	IF ( number_of_agents <= 0 ) CYCLE
2048	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
2049	DO n = 1, number_of_agents
2050	IF ( agents(n)%agent_mask ) THEN
2051	j = agents(n)%y * ddy
2052	!
2053	!-- Above calculation does not work for indices less than zero
2054	IF ( agents(n)%y < 0.0_wp ) j = -1
2055
2056	IF ( j < nys ) THEN
2057	trsa_count = trsa_count + 1
2058	ELSEIF ( j > nyn ) THEN
2059	trna_count = trna_count + 1
2060	ENDIF
2061	ENDIF
2062	ENDDO
2063	ENDDO
2064	ENDDO
2065
2066	IF ( trsa_count == 0 ) trsa_count = 1
2067	IF ( trna_count == 0 ) trna_count = 1
2068
2069	ALLOCATE( trsa(trsa_count), trna(trna_count) )
2070
2071	trsa = zero_agent
2072	trna = zero_agent
2073
2074	trsa_count = nr_move_south
2075	trna_count = nr_move_north
2076
2077	trsa(1:nr_move_south) = move_also_south(1:nr_move_south)
2078	trna(1:nr_move_north) = move_also_north(1:nr_move_north)
2079
2080	ENDIF
2081
2082	DO ip = nxl, nxr
2083	DO jp = nys, nyn, nyn-nys ! compute only first (nys) and last (nyn) loop iterration
2084	number_of_agents = agt_count(jp,ip)
2085	IF ( number_of_agents <= 0 ) CYCLE
2086	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
2087	DO n = 1, number_of_agents
2088	!
2089	!-- Only those agents that have not been marked as 'deleted' may
2090	!-- be moved.
2091	IF ( agents(n)%agent_mask ) THEN
2092
2093	j = agents(n)%y * ddy
2094	!
2095	!-- Above calculation does not work for indices less than zero
2096	IF ( agents(n)%y < 0.0_wp * dy ) j = -1
2097
2098	IF ( j < nys ) THEN
2099	IF ( j < 0 ) THEN
2100	!
2101	!-- Apply boundary condition along y
2102	IF ( ibc_mas_ns == 0 ) THEN
2103	!
2104	!-- Cyclic condition
2105	IF ( pdims(2) == 1 ) THEN
2106	agents(n)%y = ( ny + 1 ) * dy + agents(n)%y
2107	agents(n)%origin_y = ( ny + 1 ) * dy + &
2108	agents(n)%origin_y
2109	ELSE
2110	trsa_count = trsa_count + 1
2111	trsa(trsa_count) = agents(n)
2112	trsa(trsa_count)%y = ( ny + 1 ) * dy + &
2113	trsa(trsa_count)%y
2114	trsa(trsa_count)%origin_y = &
2115	trsa(trsa_count)%origin_y &
2116	+ ( ny + 1 ) * dy
2117	agents(n)%agent_mask = .FALSE.
2118	deleted_agents = deleted_agents + 1
2119
2120	IF ( trsa(trsa_count)%y >= &
2121	(ny+1)* dy - 1.0E-12_wp ) &
2122	THEN
2123	trsa(trsa_count)%y = trsa(trsa_count)%y - &
2124	1.0E-10_wp
2125	trsa(trsa_count)%origin_y = &
2126	trsa(trsa_count)%origin_y - 1
2127	ENDIF
2128
2129	ENDIF
2130
2131	ELSEIF ( ibc_mas_ns == 1 ) THEN
2132	!
2133	!-- Agent absorption
2134	agents(n)%agent_mask = .FALSE.
2135	deleted_agents = deleted_agents + 1
2136
2137	ENDIF
2138	ELSE
2139	!
2140	!-- Store agent data in the transfer array, which will
2141	!-- be send to the neighbouring PE
2142	trsa_count = trsa_count + 1
2143	trsa(trsa_count) = agents(n)
2144	agents(n)%agent_mask = .FALSE.
2145	deleted_agents = deleted_agents + 1
2146
2147	ENDIF
2148
2149	ELSEIF ( j > nyn ) THEN
2150	IF ( j > ny ) THEN
2151	!
2152	!-- Apply boundary condition along y
2153	IF ( ibc_mas_ns == 0 ) THEN
2154	!
2155	!-- Cyclic condition
2156	IF ( pdims(2) == 1 ) THEN
2157	agents(n)%y = agents(n)%y - &
2158	( ny + 1 ) * dy
2159	agents(n)%origin_y = agents(n)%origin_y - &
2160	( ny + 1 ) * dy
2161	ELSE
2162	trna_count = trna_count + 1
2163	trna(trna_count) = agents(n)
2164	trna(trna_count)%y = &
2165	trna(trna_count)%y - ( ny + 1 ) * dy
2166	trna(trna_count)%origin_y = &
2167	trna(trna_count)%origin_y - &
2168	( ny + 1 ) * dy
2169	agents(n)%agent_mask = .FALSE.
2170	deleted_agents = deleted_agents + 1
2171	ENDIF
2172
2173	ELSEIF ( ibc_mas_ns == 1 ) THEN
2174	!
2175	!-- Agent absorption
2176	agents(n)%agent_mask = .FALSE.
2177	deleted_agents = deleted_agents + 1
2178
2179	ENDIF
2180	ELSE
2181	!
2182	!-- Store agent data in the transfer array, which will
2183	!-- be send to the neighbouring PE
2184	trna_count = trna_count + 1
2185	trna(trna_count) = agents(n)
2186	agents(n)%agent_mask = .FALSE.
2187	deleted_agents = deleted_agents + 1
2188
2189	ENDIF
2190
2191	ENDIF
2192	ENDIF
2193	ENDDO
2194	ENDDO
2195	ENDDO
2196
2197	!
2198	!-- Send front boundary, receive back boundary (but first exchange how many
2199	!-- and chec if agent storage must be extended)
2200	IF ( pdims(2) /= 1 ) THEN
2201
2202	CALL MPI_SENDRECV( trsa_count, 1, MPI_INTEGER, psouth, 0, &
2203	trna_count_recv, 1, MPI_INTEGER, pnorth, 0, &
2204	comm2d, status, ierr )
2205
2206	ALLOCATE(rvna(MAX(1,trna_count_recv)))
2207	!
2208	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
2209	!-- variables in structure agent_type (due to the calculation of par_size)
2210	par_size = STORAGE_SIZE(trsa(1))/8
2211	CALL MPI_SENDRECV( trsa, trsa_count*par_size, MPI_BYTE, &
2212	psouth, 1, rvna, &
2213	trna_count_recv*par_size, MPI_BYTE, pnorth, 1, &
2214	comm2d, status, ierr )
2215
2216	IF ( trna_count_recv > 0 ) THEN
2217	CALL mas_eh_add_agents_to_gridcell(rvna(1:trna_count_recv))
2218	ENDIF
2219
2220	DEALLOCATE(rvna)
2221
2222	!
2223	!-- Send back boundary, receive front boundary
2224	CALL MPI_SENDRECV( trna_count, 1, MPI_INTEGER, pnorth, 0, &
2225	trsa_count_recv, 1, MPI_INTEGER, psouth, 0, &
2226	comm2d, status, ierr )
2227
2228	ALLOCATE(rvsa(MAX(1,trsa_count_recv)))
2229	!
2230	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
2231	!-- variables in structure agent_type (due to the calculation of par_size)
2232	par_size = STORAGE_SIZE(trna(1))/8
2233	CALL MPI_SENDRECV( trna, trna_count*par_size, MPI_BYTE, &
2234	pnorth, 1, rvsa, &
2235	trsa_count_recv*par_size, MPI_BYTE, psouth, 1, &
2236	comm2d, status, ierr )
2237
2238	IF ( trsa_count_recv > 0 ) THEN
2239	CALL mas_eh_add_agents_to_gridcell(rvsa(1:trsa_count_recv))
2240	ENDIF
2241
2242	DEALLOCATE(rvsa)
2243
2244	number_of_agents = number_of_agents + trsa_count_recv
2245
2246	DEALLOCATE( trsa, trna )
2247
2248	ENDIF
2249
2250	DEALLOCATE( move_also_north )
2251	DEALLOCATE( move_also_south )
2252
2253	!
2254	!-- Accumulate the number of agents transferred between the subdomains)
2255	CALL mas_eh_ghost_exchange
2256
2257	#else
2258
2259	DO ip = nxl, nxr, nxr-nxl
2260	DO jp = nys, nyn
2261	number_of_agents = agt_count(jp,ip)
2262	IF ( number_of_agents <= 0 ) CYCLE
2263	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
2264	DO n = 1, number_of_agents
2265	!
2266	!-- Apply boundary conditions
2267	IF ( agents(n)%x < 0.0_wp ) THEN
2268
2269	IF ( ibc_mas_lr == 0 ) THEN
2270	!
2271	!-- Cyclic boundary. Relevant coordinate has to be changed.
2272	agents(n)%x = ( nx + 1 ) * dx + agents(n)%x
2273	agents(n)%origin_x = ( nx + 1 ) * dx + &
2274	agents(n)%origin_x
2275	ELSEIF ( ibc_mas_lr == 1 ) THEN
2276	!
2277	!-- Agent absorption
2278	agents(n)%agent_mask = .FALSE.
2279	deleted_agents = deleted_agents + 1
2280	ENDIF
2281
2282	ELSEIF ( agents(n)%x >= ( nx + 1 ) * dx ) THEN
2283
2284	IF ( ibc_mas_lr == 0 ) THEN
2285	!
2286	!-- Cyclic boundary. Relevant coordinate has to be changed.
2287	agents(n)%x = agents(n)%x - ( nx + 1 ) * dx
2288
2289	ELSEIF ( ibc_mas_lr == 1 ) THEN
2290	!
2291	!-- Agent absorption
2292	agents(n)%agent_mask = .FALSE.
2293	deleted_agents = deleted_agents + 1
2294	ENDIF
2295
2296	ENDIF
2297	ENDDO
2298	ENDDO
2299	ENDDO
2300
2301	DO ip = nxl, nxr
2302	DO jp = nys, nyn, nyn-nys
2303	number_of_agents = agt_count(jp,ip)
2304	IF ( number_of_agents <= 0 ) CYCLE
2305	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
2306	DO n = 1, number_of_agents
2307
2308	IF ( agents(n)%y < 0.0_wp ) THEN
2309
2310	IF ( ibc_mas_ns == 0 ) THEN
2311	!
2312	!-- Cyclic boundary. Relevant coordinate has to be changed.
2313	agents(n)%y = ( ny + 1 ) * dy + agents(n)%y
2314	agents(n)%origin_y = ( ny + 1 ) * dy + &
2315	agents(n)%origin_y
2316
2317	ELSEIF ( ibc_mas_ns == 1 ) THEN
2318	!
2319	!-- Agent absorption
2320	agents(n)%agent_mask = .FALSE.
2321	deleted_agents = deleted_agents + 1
2322	ENDIF
2323
2324	ELSEIF ( agents(n)%y >= ( ny + 0.5_wp ) * dy ) THEN
2325
2326	IF ( ibc_mas_ns == 0 ) THEN
2327	!
2328	!-- Cyclic boundary. Relevant coordinate has to be changed.
2329	agents(n)%y = agents(n)%y - ( ny + 1 ) * dy
2330
2331	ELSEIF ( ibc_mas_ns == 1 ) THEN
2332	!
2333	!-- Agent absorption
2334	agents(n)%agent_mask = .FALSE.
2335	deleted_agents = deleted_agents + 1
2336	ENDIF
2337
2338	ENDIF
2339
2340	ENDDO
2341	ENDDO
2342	ENDDO
2343	#endif
2344
2345	END SUBROUTINE mas_eh_exchange_horiz
2346
2347
2348	#if defined( __parallel )
2349	!------------------------------------------------------------------------------!
2350	! Description:
2351	! ------------
2352	!> Sends the agents from the three gridcells closest to the
2353	!> north/south/left/right border of a PE to the corresponding neighbors ghost
2354	!> layer (which is three grid boxes deep)
2355	!------------------------------------------------------------------------------!
2356	SUBROUTINE mas_eh_ghost_exchange
2357
2358	IMPLICIT NONE
2359
2360	INTEGER(iwp) :: ip !< index variable along x
2361	INTEGER(iwp) :: jp !< index variable along y
2362	INTEGER(iwp) :: agt_size !< Bit size of agent datatype
2363	INTEGER(iwp) :: ghla_count !< ghost points left agent
2364	INTEGER(iwp) :: ghna_count !< ghost points north agent
2365	INTEGER(iwp) :: ghra_count !< ghost points right agent
2366	INTEGER(iwp) :: ghsa_count !< ghost points south agent
2367
2368	LOGICAL :: ghla_empty !< ghost points left agent
2369	LOGICAL :: ghla_empty_rcv !< ghost points left agent
2370	LOGICAL :: ghna_empty !< ghost points north agent
2371	LOGICAL :: ghna_empty_rcv !< ghost points north agent
2372	LOGICAL :: ghra_empty !< ghost points right agent
2373	LOGICAL :: ghra_empty_rcv !< ghost points right agent
2374	LOGICAL :: ghsa_empty !< ghost points south agent
2375	LOGICAL :: ghsa_empty_rcv !< ghost points south agent
2376
2377	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghla !< agents received from right PE
2378	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghna !< agents received from south PE
2379	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghra !< agents received from left PE
2380	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghsa !< agents received from north PE
2381
2382	ghla_empty = .TRUE.
2383	ghna_empty = .TRUE.
2384	ghra_empty = .TRUE.
2385	ghsa_empty = .TRUE.
2386	!
2387	!-- reset ghost layer
2388	DO ip = nxlg, nxl-1
2389	DO jp = nysg, nyng
2390	agt_count(jp,ip) = 0
2391	ENDDO
2392	ENDDO
2393	DO ip = nxr+1, nxrg
2394	DO jp = nysg, nyng
2395	agt_count(jp,ip) = 0
2396	ENDDO
2397	ENDDO
2398	DO ip = nxl, nxr
2399	DO jp = nysg, nys-1
2400	agt_count(jp,ip) = 0
2401	ENDDO
2402	ENDDO
2403	DO ip = nxl, nxr
2404	DO jp = nyn+1, nyng
2405	agt_count(jp,ip) = 0
2406	ENDDO
2407	ENDDO
2408	!
2409	!-- Transfer of agents from left to right and vice versa
2410	IF ( pdims(1) /= 1 ) THEN
2411	!
2412	!-- Reset left and right ghost layers
2413	ghla_count = 0
2414	ghra_count = 0
2415	!
2416	!-- First calculate the storage necessary for sending
2417	!-- and receiving the data.
2418	ghla_count = SUM(agt_count(nys:nyn,nxl:nxl+2))
2419	ghra_count = SUM(agt_count(nys:nyn,nxr-2:nxr))
2420	!
2421	!-- No cyclic boundaries for agents
2422	IF ( nxl == 0 .OR. ghla_count == 0 ) THEN
2423	ghla_count = 1
2424	ELSE
2425	ghla_empty = .FALSE.
2426	ENDIF
2427	IF ( nxr == nx .OR. ghra_count == 0 ) THEN
2428	ghra_count = 1
2429	ELSE
2430	ghra_empty = .FALSE.
2431	ENDIF
2432	ALLOCATE( ghla(1:ghla_count), ghra(1:ghra_count) )
2433	ghla = zero_agent
2434	ghra = zero_agent
2435	!
2436	!-- Get all agents that will be sent left into one array
2437	ghla_count = 0
2438	IF ( nxl /= 0 ) THEN
2439	DO ip = nxl, nxl+2
2440	DO jp = nys, nyn
2441
2442	number_of_agents = agt_count(jp,ip)
2443	IF ( number_of_agents <= 0 ) CYCLE
2444	ghla(ghla_count+1:ghla_count+number_of_agents) &
2445	= grid_agents(jp,ip)%agents(1:number_of_agents)
2446	ghla_count = ghla_count + number_of_agents
2447
2448	ENDDO
2449	ENDDO
2450	ENDIF
2451	IF ( ghla_count == 0 ) ghla_count = 1
2452	!
2453	!-- Get all agents that will be sent right into one array
2454	ghra_count = 0
2455	IF ( nxr /= nx ) THEN
2456	DO ip = nxr-2, nxr
2457	DO jp = nys, nyn
2458
2459	number_of_agents = agt_count(jp,ip)
2460	IF ( number_of_agents <= 0 ) CYCLE
2461	ghra(ghra_count+1:ghra_count+number_of_agents) &
2462	= grid_agents(jp,ip)%agents(1:number_of_agents)
2463	ghra_count = ghra_count + number_of_agents
2464
2465	ENDDO
2466	ENDDO
2467	ENDIF
2468	IF ( ghra_count == 0 ) ghra_count = 1
2469	!
2470	!-- Send/receive number of agents that
2471	!-- will be transferred to/from left/right neighbor
2472	CALL MPI_SENDRECV( ghla_count, 1, MPI_INTEGER, pleft, 0, &
2473	ghra_count_recv, 1, MPI_INTEGER, pright, 0, &
2474	comm2d, status, ierr )
2475	ALLOCATE ( agt_gh_r(1:ghra_count_recv) )
2476	!
2477	!-- Send/receive number of agents that
2478	!-- will be transferred to/from right/left neighbor
2479	CALL MPI_SENDRECV( ghra_count, 1, MPI_INTEGER, pright, 0, &
2480	ghla_count_recv, 1, MPI_INTEGER, pleft, 0, &
2481	comm2d, status, ierr )
2482	!
2483	!-- Send/receive flag that indicates if there are actually any agents
2484	!-- in ghost layer
2485	CALL MPI_SENDRECV( ghla_empty, 1, MPI_LOGICAL, pleft, 1, &
2486	ghra_empty_rcv, 1, MPI_LOGICAL, pright,1, &
2487	comm2d, status, ierr )
2488	CALL MPI_SENDRECV( ghra_empty, 1, MPI_LOGICAL, pright,1, &
2489	ghla_empty_rcv, 1, MPI_LOGICAL, pleft, 1, &
2490	comm2d, status, ierr )
2491
2492
2493	ALLOCATE ( agt_gh_l(1:ghla_count_recv) )
2494	!
2495	!-- Get bit size of one agent
2496	agt_size = STORAGE_SIZE(zero_agent)/8
2497	!
2498	!-- Send/receive agents to/from left/right neighbor
2499	CALL MPI_SENDRECV( ghla, ghla_count * agt_size, MPI_BYTE, &
2500	pleft, 1, &
2501	agt_gh_r, ghra_count_recv * agt_size, MPI_BYTE, &
2502	pright,1, &
2503	comm2d, status, ierr )
2504	!
2505	!-- Send/receive agents to/from left/right neighbor
2506	CALL MPI_SENDRECV( ghra, ghra_count * agt_size, MPI_BYTE, &
2507	pright,1, &
2508	agt_gh_l, ghla_count_recv * agt_size, MPI_BYTE, &
2509	pleft, 1, &
2510	comm2d, status, ierr )
2511	!
2512	!-- If agents were received, add them to the respective ghost layer cells
2513	IF ( .NOT. ghra_empty_rcv ) THEN
2514	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_r)
2515	ENDIF
2516
2517	IF ( .NOT. ghla_empty_rcv ) THEN
2518	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_l)
2519	ENDIF
2520
2521	DEALLOCATE( ghla, ghra, agt_gh_l, agt_gh_r )
2522
2523	ENDIF
2524
2525	!
2526	!-- Transfer of agents from south to north and vice versa
2527	IF ( pdims(2) /= 1 ) THEN
2528	!
2529	!-- Reset south and north ghost layers
2530	ghsa_count = 0
2531	ghna_count = 0
2532	!
2533	!-- First calculate the storage necessary for sending
2534	!-- and receiving the data.
2535	ghsa_count = SUM(agt_count(nys:nys+2,nxlg:nxrg))
2536	ghna_count = SUM(agt_count(nyn-2:nyn,nxlg:nxrg))
2537	!
2538	!-- No cyclic boundaries for agents
2539	IF ( nys == 0 .OR. ghsa_count == 0 ) THEN
2540	ghsa_count = 1
2541	ELSE
2542	ghsa_empty = .FALSE.
2543	ENDIF
2544	IF ( nyn == ny .OR. ghna_count == 0 ) THEN
2545	ghna_count = 1
2546	ELSE
2547	ghna_empty = .FALSE.
2548	ENDIF
2549	ALLOCATE( ghsa(1:ghsa_count), ghna(1:ghna_count) )
2550	ghsa = zero_agent
2551	ghna = zero_agent
2552	!
2553	!-- Get all agents that will be sent south into one array
2554	ghsa_count = 0
2555	IF ( nys /= 0 ) THEN
2556	DO ip = nxlg, nxrg
2557	DO jp = nys, nys+2
2558
2559	number_of_agents = agt_count(jp,ip)
2560	IF ( number_of_agents <= 0 ) CYCLE
2561	ghsa(ghsa_count+1:ghsa_count+number_of_agents) &
2562	= grid_agents(jp,ip)%agents(1:number_of_agents)
2563	ghsa_count = ghsa_count + number_of_agents
2564
2565	ENDDO
2566	ENDDO
2567	ENDIF
2568	IF ( ghsa_count == 0 ) ghsa_count = 1
2569	!
2570	!-- Get all agents that will be sent north into one array
2571	ghna_count = 0
2572	IF ( nyn /= ny ) THEN
2573	DO ip = nxlg, nxrg
2574	DO jp = nyn-2, nyn
2575
2576	number_of_agents = agt_count(jp,ip)
2577	IF ( number_of_agents <= 0 ) CYCLE
2578	ghna(ghna_count+1:ghna_count+number_of_agents) &
2579	= grid_agents(jp,ip)%agents(1:number_of_agents)
2580	ghna_count = ghna_count + number_of_agents
2581
2582	ENDDO
2583	ENDDO
2584	ENDIF
2585	IF ( ghna_count == 0 ) ghna_count = 1
2586	!
2587	!-- Send/receive number of agents that
2588	!-- will be transferred to/from south/north neighbor
2589	CALL MPI_SENDRECV( ghsa_count, 1, MPI_INTEGER, psouth, 0, &
2590	ghna_count_recv, 1, MPI_INTEGER, pnorth, 0, &
2591	comm2d, status, ierr )
2592	ALLOCATE ( agt_gh_n(1:ghna_count_recv) )
2593	!
2594	!-- Send/receive number of agents that
2595	!-- will be transferred to/from north/south neighbor
2596	CALL MPI_SENDRECV( ghna_count, 1, MPI_INTEGER, pnorth, 0, &
2597	ghsa_count_recv, 1, MPI_INTEGER, psouth, 0, &
2598	comm2d, status, ierr )
2599	!
2600	!-- Send/receive flag that indicates if there are actually any agents
2601	!-- in ghost layer
2602	CALL MPI_SENDRECV( ghsa_empty, 1, MPI_LOGICAL, psouth, 1, &
2603	ghna_empty_rcv, 1, MPI_LOGICAL, pnorth, 1, &
2604	comm2d, status, ierr )
2605	CALL MPI_SENDRECV( ghna_empty, 1, MPI_LOGICAL, pnorth, 1, &
2606	ghsa_empty_rcv, 1, MPI_LOGICAL, psouth, 1, &
2607	comm2d, status, ierr )
2608
2609
2610	ALLOCATE ( agt_gh_s(1:ghsa_count_recv) )
2611	!
2612	!-- Get bit size of one agent
2613	agt_size = STORAGE_SIZE(zero_agent)/8
2614	!
2615	!-- Send/receive agents to/from south/north neighbor
2616	CALL MPI_SENDRECV( ghsa, ghsa_count * agt_size, MPI_BYTE, &
2617	psouth,1, &
2618	agt_gh_n, ghna_count_recv * agt_size, MPI_BYTE, &
2619	pnorth,1, &
2620	comm2d, status, ierr )
2621	!
2622	!-- Send/receive agents to/from south/north neighbor
2623	CALL MPI_SENDRECV( ghna, ghna_count * agt_size, MPI_BYTE, &
2624	pnorth,1, &
2625	agt_gh_s, ghsa_count_recv * agt_size, MPI_BYTE, &
2626	psouth,1, &
2627	comm2d, status, ierr )
2628	!
2629	!-- If agents were received, add them to the respective ghost layer cells
2630	IF ( .NOT. ghna_empty_rcv ) THEN
2631	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_n)
2632	ENDIF
2633
2634	IF ( .NOT. ghsa_empty_rcv ) THEN
2635	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_s)
2636	ENDIF
2637
2638	DEALLOCATE( ghna, ghsa, agt_gh_n, agt_gh_s )
2639
2640	ENDIF
2641
2642	END SUBROUTINE mas_eh_ghost_exchange
2643	#endif
2644
2645	!------------------------------------------------------------------------------!
2646	! Description:
2647	! ------------
2648	!> If an agent moves from one grid cell to another (on the current
2649	!> processor!), this subroutine moves the corresponding element from the
2650	!> agent array of the old grid cell to the agent array of the new grid
2651	!> cell.
2652	!------------------------------------------------------------------------------!
2653	SUBROUTINE mas_eh_move_agent
2654
2655	IMPLICIT NONE
2656
2657	INTEGER(iwp) :: i !< grid index (x) of agent position
2658	INTEGER(iwp) :: ip !< index variable along x
2659	INTEGER(iwp) :: j !< grid index (y) of agent position
2660	INTEGER(iwp) :: jp !< index variable along y
2661	INTEGER(iwp) :: n !< index variable for agent array
2662	INTEGER(iwp) :: na_before_move !< number of agents per grid box before moving
2663	INTEGER(iwp) :: aindex !< dummy argument for number of new agent per grid box
2664
2665	TYPE(agent_type), DIMENSION(:), POINTER :: agents_before_move !< agents before moving
2666
2667	DO ip = nxl, nxr
2668	DO jp = nys, nyn
2669
2670	na_before_move = agt_count(jp,ip)
2671	IF ( na_before_move <= 0 ) CYCLE
2672	agents_before_move => grid_agents(jp,ip)%agents(1:na_before_move)
2673
2674	DO n = 1, na_before_move
2675	i = agents_before_move(n)%x * ddx
2676	j = agents_before_move(n)%y * ddy
2677
2678	!-- For mas_eh_exchange_horiz to work properly agents need to be
2679	!-- moved to the outermost gridboxes of the respective processor.
2680	!-- If the agent index is inside the processor the following
2681	!-- lines will not change the index
2682	i = MIN ( i , nxr )
2683	i = MAX ( i , nxl )
2684	j = MIN ( j , nyn )
2685	j = MAX ( j , nys )
2686
2687	!
2688	!-- Check if agent has moved to another grid cell.
2689	IF ( i /= ip .OR. j /= jp ) THEN
2690	!
2691	!-- If the agent stays on the same processor, the agent
2692	!-- will be added to the agent array of the new processor.
2693	number_of_agents = agt_count(j,i)
2694	agents => grid_agents(j,i)%agents(1:number_of_agents)
2695
2696	aindex = number_of_agents+1
2697	IF ( aindex > SIZE(grid_agents(j,i)%agents) ) &
2698	THEN
2699	CALL mas_eh_realloc_agents_array(i,j)
2700	ENDIF
2701
2702	grid_agents(j,i)%agents(aindex) = agents_before_move(n)
2703	agt_count(j,i) = aindex
2704
2705	agents_before_move(n)%agent_mask = .FALSE.
2706	ENDIF
2707	ENDDO
2708
2709	ENDDO
2710	ENDDO
2711
2712	RETURN
2713
2714	END SUBROUTINE mas_eh_move_agent
2715
2716	!------------------------------------------------------------------------------!
2717	! Description:
2718	! ------------
2719	!> If the allocated memory for the agent array do not suffice to add arriving
2720	!> agents from neighbour grid cells, this subrouting reallocates the
2721	!> agent array to assure enough memory is available.
2722	!------------------------------------------------------------------------------!
2723	SUBROUTINE mas_eh_realloc_agents_array (i,j,size_in)
2724
2725	IMPLICIT NONE
2726
2727	INTEGER(iwp) :: old_size !< old array size
2728	INTEGER(iwp) :: new_size !< new array size
2729
2730	INTEGER(iwp), INTENT(in) :: i !< grid index (y)
2731	INTEGER(iwp), INTENT(in) :: j !< grid index (y)
2732
2733	INTEGER(iwp), INTENT(in), OPTIONAL :: size_in !< size of input array
2734
2735	TYPE(agent_type), DIMENSION(10) :: tmp_agents_s !< temporary static agent array
2736
2737	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: tmp_agents_d !< temporary dynamic agent array
2738
2739	old_size = SIZE(grid_agents(j,i)%agents)
2740
2741	IF ( PRESENT(size_in) ) THEN
2742	new_size = size_in
2743	ELSE
2744	new_size = old_size * ( 1.0_wp + alloc_factor_mas / 100.0_wp )
2745	ENDIF
2746
2747	new_size = MAX( new_size, min_nr_agent, old_size + 1 )
2748
2749	IF ( old_size <= 10 ) THEN
2750
2751	tmp_agents_s(1:old_size) = grid_agents(j,i)%agents(1:old_size)
2752
2753	DEALLOCATE(grid_agents(j,i)%agents)
2754	ALLOCATE(grid_agents(j,i)%agents(new_size))
2755
2756	grid_agents(j,i)%agents(1:old_size) = tmp_agents_s(1:old_size)
2757	grid_agents(j,i)%agents(old_size+1:new_size) = zero_agent
2758
2759	ELSE
2760
2761	ALLOCATE(tmp_agents_d(new_size))
2762	tmp_agents_d(1:old_size) = grid_agents(j,i)%agents
2763
2764	DEALLOCATE(grid_agents(j,i)%agents)
2765	ALLOCATE(grid_agents(j,i)%agents(new_size))
2766
2767	grid_agents(j,i)%agents(1:old_size) = tmp_agents_d(1:old_size)
2768	grid_agents(j,i)%agents(old_size+1:new_size) = zero_agent
2769
2770	DEALLOCATE(tmp_agents_d)
2771
2772	ENDIF
2773	agents => grid_agents(j,i)%agents(1:number_of_agents)
2774
2775	RETURN
2776	END SUBROUTINE mas_eh_realloc_agents_array
2777
2778	!------------------------------------------------------------------------------!
2779	! Description:
2780	! ------------
2781	!> Inquires prognostic model quantities at the position of each agent and
2782	!> stores them in that agent for later output
2783	!------------------------------------------------------------------------------!
2784	SUBROUTINE mas_get_prognostic_quantities
2785
2786	USE arrays_3d, &
2787	ONLY: u, v, pt, exner
2788
2789	IMPLICIT NONE
2790
2791	INTEGER(iwp) :: i_offset !< index offset for windspeed measurement
2792	INTEGER(iwp) :: il !< x-index
2793	INTEGER(iwp) :: is !< subgrid box counter
2794	INTEGER(iwp) :: j_offset !< index offset for windspeed measurement
2795	INTEGER(iwp) :: jl !< y-index
2796	INTEGER(iwp) :: kl !< z-index
2797	INTEGER(iwp) :: nl !< agent counter
2798	INTEGER(iwp) :: se !< subgrid box end index
2799	INTEGER(iwp) :: si !< subgrid box start index
2800
2801	REAL(wp) :: u_a !< windspeed at agent position (x)
2802	REAL(wp) :: v_a !< windspeed at agent position (y)
2803
2804	DO il = nxl, nxr
2805	DO jl = nys, nyn
2806
2807	number_of_agents = agt_count(jl,il)
2808	!
2809	!-- If grid cell is empty, cycle
2810	IF ( number_of_agents <= 0 ) CYCLE
2811	kl = s_measure_height(jl,il)
2812
2813	agents => grid_agents(jl,il)%agents(1:number_of_agents)
2814	!
2815	!-- loop over the four subgrid boxes
2816	DO is = 0,3
2817	!
2818	!-- Set indices
2819	si = grid_agents(jl,il)%start_index(is)
2820	se = grid_agents(jl,il)%end_index(is)
2821	DO nl = si, se
2822	!
2823	!-- Calculate index offset in x-direction:
2824	!-- Left value if wall right of grid box
2825	!-- Right value if wall left of grid box
2826	!-- Else the one that is closer to the agent
2827	IF ( BTEST( obstacle_flags( jl, il+1 ), 6 ) ) THEN
2828	i_offset = 0
2829	ELSEIF ( BTEST( obstacle_flags( jl, il-1 ), 2 ) ) THEN
2830	i_offset = 1
2831	ELSE
2832	i_offset = MERGE( 0, 1, BTEST(is,1) )
2833	ENDIF
2834	u_a = u( kl, jl, il + i_offset )
2835	!
2836	!-- Calculate index offset in y-direction:
2837	!-- South value if wall north of grid box
2838	!-- North value if wall south of grid box
2839	!-- Else the one that is closer to the agent
2840	IF ( BTEST( obstacle_flags( jl+1, il ), 4 ) ) THEN
2841	j_offset = 0
2842	ELSEIF ( BTEST( obstacle_flags( jl-1, il ), 0 ) ) THEN
2843	j_offset = 1
2844	ELSE
2845	j_offset = MERGE( 0, 1, BTEST(is,0) )
2846	ENDIF
2847	v_a = v( kl, jl + j_offset, il )
2848	!
2849	!-- Calculate windspeed at agent postion
2850	agents(nl)%windspeed = SQRT(u_a2 + v_a2)
2851	!
2852	!-- Calculate temperature at agent position
2853	agents(nl)%t = pt(kl,jl,il) * exner(kl)
2854
2855	ENDDO
2856
2857	ENDDO
2858
2859	ENDDO
2860	ENDDO
2861
2862	END SUBROUTINE mas_get_prognostic_quantities
2863
2864	!------------------------------------------------------------------------------!
2865	! Description:
2866	! ------------
2867	!> Adds an item to the priority queue (binary heap) at the correct position
2868	!------------------------------------------------------------------------------!
2869	SUBROUTINE mas_heap_insert_item( id, priority )
2870
2871	IMPLICIT NONE
2872
2873	INTEGER(iwp) :: cur_pos !< current position
2874	INTEGER(iwp) :: id !< mesh ID of item
2875
2876	REAL(wp) :: priority !< item priority
2877
2878	TYPE(heap_item) :: item !< heap item
2879
2880	item%mesh_id = id
2881	item%priority = priority
2882	!
2883	!-- Extend heap, if necessary
2884	IF ( heap_count + 1 > SIZE(queue) ) THEN
2885	CALL mas_heap_extend
2886	ENDIF
2887	!
2888	!-- Insert item at first unoccupied postion (highest index) of heap
2889	cur_pos = heap_count
2890	queue(cur_pos) = item
2891	!
2892	!-- Sort while inserted item is not at top of heap
2893	DO WHILE ( cur_pos /= 0 )
2894	!
2895	!-- If priority < its parent's priority, swap them.
2896	!-- Else, sorting is done.
2897	IF ( queue(cur_pos)%priority &
2898	< queue(FLOOR((cur_pos)/2.))%priority ) &
2899	THEN
2900	item = queue(cur_pos)
2901	queue(cur_pos) = queue(FLOOR((cur_pos)/2.))
2902	queue(FLOOR((cur_pos)/2.)) = item
2903	cur_pos = FLOOR((cur_pos)/2.)
2904	ELSE
2905	EXIT
2906	ENDIF
2907	ENDDO
2908	!
2909	!-- Item was added to heap, so the heap count increases
2910	heap_count = heap_count + 1
2911
2912	END SUBROUTINE mas_heap_insert_item
2913
2914	!------------------------------------------------------------------------------!
2915	! Description:
2916	! ------------
2917	!> Extends the size of the priority queue (binary heap)
2918	!------------------------------------------------------------------------------!
2919	SUBROUTINE mas_heap_extend
2920
2921	IMPLICIT NONE
2922
2923	INTEGER(iwp) :: soh !< size of heap
2924
2925	TYPE(heap_item), DIMENSION(:), ALLOCATABLE :: dummy_heap !< dummy heap
2926
2927	soh = SIZE(queue)-1
2928	ALLOCATE(dummy_heap(0:soh))
2929	dummy_heap = queue
2930	DEALLOCATE(queue)
2931	ALLOCATE(queue(0:2*soh+1))
2932	queue(0:soh) = dummy_heap(0:soh)
2933
2934	END SUBROUTINE mas_heap_extend
2935
2936	!------------------------------------------------------------------------------!
2937	! Description:
2938	! ------------
2939	!> Removes first (smallest) element from the priority queue, reorders the rest
2940	!> and returns the ID of the removed mesh point
2941	!------------------------------------------------------------------------------!
2942	SUBROUTINE mas_heap_extract_item ( id )
2943
2944	IMPLICIT NONE
2945
2946	INTEGER(iwp) :: id !< ID of item extracted item
2947	INTEGER(iwp) :: child !< child of item in heap
2948	INTEGER(iwp) :: cur_pos !< current position of item in heap
2949
2950	TYPE(heap_item) :: dummy
2951	!
2952	!-- Get ID of mesh point with lowest priority (extracted item: top of heap)
2953	id = queue(0)%mesh_id
2954	!
2955	!-- Put last item in heap at first position
2956	queue(0) = queue(heap_count-1)
2957	cur_pos = 0
2958	DO
2959	!
2960	!-- If current item has no children, sorting is done
2961	IF( 2*cur_pos+1 > heap_count - 1 ) THEN
2962	EXIT
2963	!
2964	!-- If current item has only one child, check if item and its child are
2965	!-- ordered correctly. Else, swap them.
2966	ELSEIF ( 2*cur_pos+2 > heap_count - 1 ) THEN
2967	IF ( queue(cur_pos)%priority > queue(2*cur_pos+1)%priority ) THEN
2968	dummy = queue(cur_pos)
2969	queue(cur_pos) = queue(2*cur_pos+1)
2970	queue(2*cur_pos+1) = dummy
2971	cur_pos = 2*cur_pos+1
2972	ELSE
2973	EXIT
2974	ENDIF
2975	ELSE
2976	!
2977	!-- determine the smaller child
2978	IF ( queue(2*cur_pos+1)%priority &
2979	>= queue(2*cur_pos+2)%priority ) &
2980	THEN
2981	child = 2
2982	ELSE
2983	child = 1
2984	ENDIF
2985	!
2986	!-- Check if item and its smaller child are ordered falsely. If so,
2987	!-- swap them. Else, sorting is done.
2988	IF ( queue(cur_pos)%priority > queue(2*cur_pos+child )%priority ) &
2989	THEN
2990	dummy = queue(cur_pos)
2991	queue(cur_pos) = queue(2*cur_pos+child)
2992	queue(2*cur_pos+child) = dummy
2993	cur_pos = 2*cur_pos+child
2994	ELSE
2995	EXIT
2996	ENDIF
2997	ENDIF
2998	ENDDO
2999	!
3000	!-- Top item was removed from heap, thus, heap_cout decreases by one
3001	heap_count = heap_count-1
3002
3003	END SUBROUTINE mas_heap_extract_item
3004
3005	!------------------------------------------------------------------------------!
3006	! Description:
3007	! ------------
3008	!> Initialization of Multi Agent System
3009	!------------------------------------------------------------------------------!
3010	SUBROUTINE mas_init
3011
3012	USE control_parameters, &
3013	ONLY: coupling_char, initializing_actions, io_blocks, io_group
3014
3015	USE arrays_3d, &
3016	ONLY: zu, zw
3017
3018	USE indices, &
3019	ONLY: nzt
3020
3021	IMPLICIT NONE
3022
3023	INTEGER(iwp) :: i !< grid cell (x)
3024	INTEGER(iwp) :: ii !< io-block counter
3025	INTEGER(iwp) :: il !< io-block counter
3026	INTEGER(iwp) :: jl !< io-block counter
3027	INTEGER(iwp) :: kl !< io-block counter
3028	INTEGER(iwp) :: kdum !< io-block counter
3029	INTEGER(iwp) :: locdum !< io-block counter
3030	INTEGER(iwp) :: j !< grid cell (y)
3031	INTEGER(iwp) :: size_of_mesh !< temporary value for read
3032	INTEGER(iwp) :: size_of_pols !< temporary value for read
3033	INTEGER(iwp) :: ioerr !< IOSTAT flag for IO-commands ( 0 = no error )
3034
3035	LOGICAL :: navigation_data_present !< Flag: check for input file
3036
3037	REAL(wp) :: zdum !< dummy for measurement height
3038	REAL(wp) :: avg_agt_height = 1.8_wp
3039
3040
3041	!
3042	!-- Check the number of agent groups.
3043	IF ( number_of_agent_groups > max_number_of_agent_groups ) THEN
3044	WRITE( message_string, * ) 'max_number_of_agent_groups =', &
3045	max_number_of_agent_groups , &
3046	'&number_of_agent_groups reset to ', &
3047	max_number_of_agent_groups
3048	CALL message( 'mas_init', 'PA0072', 0, 1, 0, 6, 0 )
3049	number_of_agent_groups = max_number_of_agent_groups
3050	ENDIF
3051
3052	!
3053	!-- Set some parameters
3054	d_sigma_rep_agent = 1.0_wp/sigma_rep_agent
3055	d_sigma_rep_wall = 1.0_wp/sigma_rep_wall
3056	d_tau_accel_agent = 1.0_wp/tau_accel_agent
3057	IF ( dt_agent /= 999.0_wp ) THEN
3058	agent_own_timestep = .TRUE.
3059	ENDIF
3060
3061	!
3062	!-- Get index of first grid box above topography
3063	ALLOCATE( top_top_s(nysg:nyng,nxlg:nxrg), &
3064	top_top_w(nysg:nyng,nxlg:nxrg), &
3065	s_measure_height(nys:nyn,nxl:nxr) )
3066	!
3067	!-- Get first index above topography for scalar grid and last index in
3068	!-- topography for z-component of wind
3069	DO il = nxlg, nxrg
3070	DO jl = nysg, nyng
3071	top_top_s(jl,il) = topo_top_ind(jl,il,0) + 1
3072	top_top_w(jl,il) = topo_top_ind(jl,il,3)
3073	ENDDO
3074	ENDDO
3075	!
3076	!-- Create 2D array containing the index at which measurements are done by
3077	!-- agents. The height of this measurement is given by avg_agt_height.
3078	DO il = nxl, nxr
3079	DO jl = nys, nyn
3080
3081	kdum = top_top_w(jl,il)
3082	zdum = zw(kdum)
3083	zdum = zdum + avg_agt_height
3084	locdum = 0
3085	!
3086	!-- Locate minimum distance from u-grid to measurement height (zdum)
3087	DO kl = 1, nzt
3088	IF ( ABS(zu(kl)-zdum) < ABS(zu(locdum)-zdum) ) locdum = kl
3089	ENDDO
3090	s_measure_height(jl,il) = locdum
3091
3092	ENDDO
3093	ENDDO
3094
3095	CALL mas_create_obstacle_flags
3096
3097	!
3098	!-- Set default start positions, if necessary
3099	IF ( asl(1) == 9999999.9_wp ) asl(1) = 0.0_wp
3100	IF ( asr(1) == 9999999.9_wp ) asr(1) = ( nx + 1 ) * dx
3101	IF ( ass(1) == 9999999.9_wp ) ass(1) = 0.0_wp
3102	IF ( asn(1) == 9999999.9_wp ) asn(1) = ( ny + 1 ) * dy
3103	IF ( adx(1) == 9999999.9_wp .OR. adx(1) == 0.0_wp ) adx(1) = dx
3104	IF ( ady(1) == 9999999.9_wp .OR. ady(1) == 0.0_wp ) ady(1) = dy
3105
3106	DO j = 2, number_of_agent_groups
3107	IF ( asl(j) == 9999999.9_wp ) asl(j) = asl(j-1)
3108	IF ( asr(j) == 9999999.9_wp ) asr(j) = asr(j-1)
3109	IF ( ass(j) == 9999999.9_wp ) ass(j) = ass(j-1)
3110	IF ( asn(j) == 9999999.9_wp ) asn(j) = asn(j-1)
3111	IF ( adx(j) == 9999999.9_wp .OR. adx(j) == 0.0_wp ) adx(j) = adx(j-1)
3112	IF ( ady(j) == 9999999.9_wp .OR. ady(j) == 0.0_wp ) ady(j) = ady(j-1)
3113	ENDDO
3114
3115	!
3116	!-- Check boundary condition and set internal variables
3117	SELECT CASE ( bc_mas_lr )
3118
3119	CASE ( 'cyclic' )
3120	ibc_mas_lr = 0
3121
3122	CASE ( 'absorb' )
3123	ibc_mas_lr = 1
3124
3125	CASE DEFAULT
3126	WRITE( message_string, * ) 'unknown boundary condition ', &
3127	'bc_mas_lr = "', TRIM( bc_mas_lr ), '"'
3128	CALL message( 'mas_init', 'PA0073', 1, 2, 0, 6, 0 )
3129
3130	END SELECT
3131	SELECT CASE ( bc_mas_ns )
3132
3133	CASE ( 'cyclic' )
3134	ibc_mas_ns = 0
3135
3136	CASE ( 'absorb' )
3137	ibc_mas_ns = 1
3138
3139	CASE DEFAULT
3140	WRITE( message_string, * ) 'unknown boundary condition ', &
3141	'bc_mas_ns = "', TRIM( bc_mas_ns ), '"'
3142	CALL message( 'mas_init', 'PA0074', 1, 2, 0, 6, 0 )
3143
3144	END SELECT
3145
3146	!
3147	!-- For the first model run of a possible job chain initialize the
3148	!-- agents, otherwise read the agent data from restart file.
3149	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
3150	.AND. read_agents_from_restartfile ) THEN
3151
3152	! CALL mas_read_restart_file
3153
3154	ELSE
3155	!
3156	!-- Read preprocessed data of navigation mesh and building polygons
3157	!-- for agent pathfinding
3158	DO ii = 0, io_blocks-1
3159	IF ( ii == io_group ) THEN
3160	!
3161	!-- Check for naviation input file and open it
3162	INQUIRE( FILE='NAVIGATION_DATA' // TRIM( coupling_char ), EXIST=navigation_data_present )
3163	IF ( .NOT. navigation_data_present ) THEN
3164	message_string = 'Input file NAVIGATION_DATA' // &
3165	TRIM( coupling_char ) // ' for MAS missing. ' // &
3166	'&Please run agent_preprocessing before the job to create it.'
3167	CALL message( 'mas_init', 'PA0525', 1, 2, 0, 6, 0 )
3168	ENDIF
3169	OPEN ( 119, FILE='NAVIGATION_DATA'//TRIM( coupling_char ), &
3170	FORM='UNFORMATTED', IOSTAT=ioerr )
3171	!
3172	!-- Read mesh data
3173	READ(119) size_of_mesh
3174	ALLOCATE( mesh(1:size_of_mesh))
3175	DO i = 1, size_of_mesh
3176	READ(119) mesh(i)%polygon_id, mesh(i)%vertex_id, &
3177	mesh(i)%noc, mesh(i)%origin_id, &
3178	mesh(i)%cost_so_far, mesh(i)%x, &
3179	mesh(i)%y, mesh(i)%x_s, mesh(i)%y_s
3180	ALLOCATE( mesh(i)%connected_vertices(1:mesh(i)%noc), &
3181	mesh(i)%distance_to_vertex(1:mesh(i)%noc) )
3182	DO j = 1, mesh(i)%noc
3183	READ(119) mesh(i)%connected_vertices(j), &
3184	mesh(i)%distance_to_vertex(j)
3185	ENDDO
3186	ENDDO
3187	!
3188	!-- Read polygon data
3189	READ(119) size_of_pols
3190	ALLOCATE( polygons(1:size_of_pols) )
3191	DO i = 1, size_of_pols
3192	READ(119) polygons(i)%nov
3193	ALLOCATE( polygons(i)%vertices(0:polygons(i)%nov+1) )
3194	DO j = 0, polygons(i)%nov+1
3195	READ(119) polygons(i)%vertices(j)%delete, &
3196	polygons(i)%vertices(j)%x, &
3197	polygons(i)%vertices(j)%y
3198	ENDDO
3199	ENDDO
3200	CLOSE(119)
3201
3202	ENDIF
3203	#if defined( __parallel ) && ! defined ( __check )
3204	CALL MPI_BARRIER( comm2d, ierr )
3205	#endif
3206	ENDDO
3207
3208	!
3209	!-- Allocate agent arrays and set attributes of the initial set of
3210	!-- agents, which can be also periodically released at later times.
3211	ALLOCATE( agt_count (nysg:nyng,nxlg:nxrg), &
3212	grid_agents(nysg:nyng,nxlg:nxrg) )
3213	!
3214	!-- Allocate dummy arrays for pathfinding
3215	ALLOCATE( dummy_path_x(0:agt_path_size), &
3216	dummy_path_y(0:agt_path_size) )
3217
3218	number_of_agents = 0
3219	sort_count_mas = 0
3220	agt_count = 0
3221
3222	!
3223	!-- initialize counter for agent IDs
3224	grid_agents%id_counter = 1
3225
3226	!
3227	!-- Initialize all agents with dummy values (otherwise errors may
3228	!-- occur within restart runs). The reason for this is still not clear
3229	!-- and may be presumably caused by errors in the respective user-interface.
3230	zero_agent%agent_mask = .FALSE.
3231	zero_agent%block_nr = -1
3232	zero_agent%group = 0
3233	zero_agent%id = 0_idp
3234	zero_agent%path_counter = agt_path_size
3235	zero_agent%age = 0.0_wp
3236	zero_agent%age_m = 0.0_wp
3237	zero_agent%dt_sum = 0.0_wp
3238	zero_agent%clo = 0.0_wp
3239	zero_agent%energy_storage= 0.0_wp
3240	zero_agent%force_x = 0.0_wp
3241	zero_agent%force_y = 0.0_wp
3242	zero_agent%origin_x = 0.0_wp
3243	zero_agent%origin_y = 0.0_wp
3244	zero_agent%speed_abs = 0.0_wp
3245	zero_agent%speed_e_x = 0.0_wp
3246	zero_agent%speed_e_y = 0.0_wp
3247	zero_agent%speed_des = random_normal(desired_speed, des_sp_sig)
3248	zero_agent%speed_x = 0.0_wp
3249	zero_agent%speed_y = 0.0_wp
3250	zero_agent%ipt = 0.0_wp
3251	zero_agent%x = 0.0_wp
3252	zero_agent%y = 0.0_wp
3253	zero_agent%path_x = 0.0_wp
3254	zero_agent%path_y = 0.0_wp
3255	zero_agent%t_x = 0.0_wp
3256	zero_agent%t_y = 0.0_wp
3257
3258	!
3259	!-- Set a seed value for the random number generator to be exclusively
3260	!-- used for the agent code. The generated random numbers should be
3261	!-- different on the different PEs.
3262	iran_agent = iran_agent + myid
3263
3264	CALL mas_create_agent (PHASE_INIT)
3265
3266	ENDIF
3267
3268	!
3269	!-- To avoid programm abort, assign agents array to the local version of
3270	!-- first grid cell
3271	number_of_agents = agt_count(nys,nxl)
3272	agents => grid_agents(nys,nxl)%agents(1:number_of_agents)
3273
3274	END SUBROUTINE mas_init
3275
3276	!------------------------------------------------------------------------------!
3277	! Description:
3278	! ------------
3279	!> Output of informative message about maximum agent number
3280	!------------------------------------------------------------------------------!
3281	SUBROUTINE mas_last_actions
3282
3283	USE control_parameters, &
3284	ONLY: message_string
3285
3286	IMPLICIT NONE
3287
3288	WRITE(message_string,'(A,I8,A)') &
3289	'The maximumn number of agents during this run was', &
3290	maximum_number_of_agents, &
3291	'&Consider adjusting the INPUT parameter'// &
3292	'&dim_size_agtnum_manual accordingly for the next run.'
3293
3294	CALL message( 'mas_data_output_agents', 'PA0457', 0, 0, 0, 6, 0 )
3295
3296	END SUBROUTINE mas_last_actions
3297
3298	!------------------------------------------------------------------------------!
3299	! Description:
3300	! ------------
3301	!> Finds the shortest path from a start position to a target position using the
3302	!> A*-algorithm
3303	!------------------------------------------------------------------------------!
3304	SUBROUTINE mas_nav_a_star( start_x, start_y, target_x, target_y, nsteps )
3305
3306	IMPLICIT NONE
3307
3308	LOGICAL :: target_reached !< flag
3309
3310	INTEGER(iwp) :: cur_node !< current node of binary heap
3311	INTEGER(iwp) :: il !< counter (x)
3312	INTEGER(iwp) :: neigh_node !< neighbor node
3313	INTEGER(iwp) :: node_counter !< binary heap node counter
3314	INTEGER(iwp) :: path_ag !< index of agent path
3315	INTEGER(iwp) :: som !< size of mesh
3316	INTEGER(iwp) :: steps !< steps along the path
3317	INTEGER(iwp) :: nsteps !< number of steps
3318
3319	REAL(wp) :: start_x !< x-coordinate agent
3320	REAL(wp) :: start_y !< y-coordinate agent
3321	REAL(wp) :: new_cost !< updated cost to reach node
3322	REAL(wp) :: new_priority !< priority of node to be added to queue
3323	REAL(wp) :: rn_gate !< random number for corner gate
3324	REAL(wp) :: target_x !< x-coordinate target
3325	REAL(wp) :: target_y !< y-coordinate target
3326	!
3327	!-- Coordinate Type
3328	TYPE coord
3329	REAL(wp) :: x !< x-coordinate
3330	REAL(wp) :: x_s !< x-coordinate (shifted)
3331	REAL(wp) :: y !< y-coordinate
3332	REAL(wp) :: y_s !< y-coordinate (shifted)
3333	END TYPE coord
3334
3335	TYPE(coord), DIMENSION(:), ALLOCATABLE, TARGET :: path !< path array
3336	TYPE(coord), DIMENSION(:), ALLOCATABLE, TARGET :: tmp_path !< temporary path for resizing
3337
3338	node_counter = 0
3339	!
3340	!-- Create temporary navigation mesh including agent and target positions
3341	CALL mas_nav_create_tmp_mesh( start_x, start_y, target_x, target_y, som )
3342	tmp_mesh(som)%cost_so_far = 0.0_wp
3343	!
3344	!-- Initialize priority queue
3345	heap_count = 0_iwp
3346	ALLOCATE(queue(0:100))
3347	target_reached = .FALSE.
3348	!
3349	!-- Add starting point (agent position) to frontier (the frontier consists
3350	!-- of all the nodes that are to be visited. The node with the smallest
3351	!-- priority will be visited first. The priority consists of the distance
3352	!-- from the start node to this node plus a minimal guess (direct distance)
3353	!-- from this node to the goal). For the starting node, the priority is set
3354	!-- to 0, as it's the only node thus far
3355	CALL mas_heap_insert_item(som,0.0_wp)
3356	cur_node = som
3357	DO WHILE ( heap_count > 0 )
3358	!
3359	!-- Step one: Pick lowest priority item from queue
3360	node_counter = node_counter + 1
3361	CALL mas_heap_extract_item(cur_node)
3362	!
3363	!-- Node 0 is the goal node
3364	IF ( cur_node == 0 ) THEN
3365	EXIT
3366	ENDIF
3367	!
3368	!-- Loop over all of cur_node's neighbors
3369	DO il = 1, tmp_mesh(cur_node)%noc
3370	neigh_node = tmp_mesh(cur_node)%connected_vertices(il)
3371	!
3372	!-- Check, if the way from the start node to this neigh_node via
3373	!-- cur_node is shorter than the previously found shortest path to it.
3374	!-- If so, replace said cost and add neigh_node to the frontier.
3375	!-- cost_so_far is initialized as 1.d12 so that all found distances
3376	!-- should be smaller.
3377	new_cost = tmp_mesh(cur_node)%cost_so_far &
3378	+ tmp_mesh(cur_node)%distance_to_vertex(il)
3379	IF ( new_cost < tmp_mesh(neigh_node)%cost_so_far ) THEN
3380	tmp_mesh(neigh_node)%cost_so_far = new_cost
3381	tmp_mesh(neigh_node)%origin_id = cur_node
3382	!
3383	!-- Priority in the queue is cost_so_far + heuristic to goal
3384	new_priority = new_cost &
3385	+ heuristic(tmp_mesh(neigh_node)%x, &
3386	tmp_mesh(neigh_node)%y, tmp_mesh(0)%x, &
3387	tmp_mesh(0)%y)
3388	CALL mas_heap_insert_item(neigh_node,new_priority)
3389	ENDIF
3390	ENDDO
3391	ENDDO
3392	!
3393	!-- Add nodes to a path array. To do this, we must backtrack from the target
3394	!-- node to its origin to its origin and so on until an node is reached that
3395	!-- has no origin (%origin_id == -1). This is the starting node.
3396	DEALLOCATE(queue)
3397	cur_node = 0
3398	steps = 0
3399	ALLOCATE(path(1:100))
3400	DO WHILE ( cur_node /= -1 )
3401	steps = steps + 1
3402	!
3403	!-- Resize path array if necessary
3404	IF ( steps > SIZE(path) ) THEN
3405	ALLOCATE(tmp_path(1:steps-1))
3406	tmp_path(1:steps-1) = path(1:steps-1)
3407	DEALLOCATE(path)
3408	ALLOCATE(path(1:2*(steps-1)))
3409	path(1:steps-1) = tmp_path(1:steps-1)
3410	DEALLOCATE(tmp_path)
3411	ENDIF
3412	path(steps)%x = tmp_mesh(cur_node)%x
3413	path(steps)%y = tmp_mesh(cur_node)%y
3414	path(steps)%x_s = tmp_mesh(cur_node)%x_s
3415	path(steps)%y_s = tmp_mesh(cur_node)%y_s
3416	cur_node = tmp_mesh(cur_node)%origin_id
3417	ENDDO
3418	!
3419	!-- Add calculated intermittent targets to the path until either the
3420	!-- target or the maximum number of intermittent targets is reached.
3421	!-- Ignore starting point (reduce index by one), it is agent position.
3422	dummy_path_x = -1
3423	dummy_path_y = -1
3424	path_ag = 1
3425	steps = steps - 1
3426	nsteps = 0
3427	DO WHILE( steps > 0 .AND. path_ag <= agt_path_size )
3428	!
3429	!-- Each target point is randomly chosen along a line target along the
3430	!-- bisector of the building corner that starts at corner_gate_start
3431	!-- and has a width of corner_gate_width. This is to avoid clustering
3432	!-- when opposing agent groups try to reach the same corner target.
3433	rn_gate = random_function(iran_agent) * corner_gate_width &
3434	+ corner_gate_start
3435	dummy_path_x(path_ag) = path(steps)%x + rn_gate &
3436	* (path(steps)%x_s - path(steps)%x)
3437	dummy_path_y(path_ag) = path(steps)%y + rn_gate &
3438	* (path(steps)%y_s - path(steps)%y)
3439	steps = steps - 1
3440	path_ag = path_ag + 1
3441	nsteps = nsteps + 1
3442	ENDDO
3443	!
3444	!-- Set current intermittent target of this agent
3445	DEALLOCATE(tmp_mesh, path)
3446
3447	END SUBROUTINE mas_nav_a_star
3448
3449	!------------------------------------------------------------------------------!
3450	! Description:
3451	! ------------
3452	!> Adds a connection between two points of the navigation mesh
3453	!> (one-way: in_mp1 to in_mp2)
3454	!------------------------------------------------------------------------------!
3455	SUBROUTINE mas_nav_add_connection ( in_mp1, id2, in_mp2 )
3456
3457	IMPLICIT NONE
3458
3459	LOGICAL :: connection_established !< Flag to indicate if connection has already been established
3460
3461	INTEGER(iwp) :: id2 !< ID of in_mp2
3462	INTEGER(iwp) :: il !< local counter
3463	INTEGER(iwp) :: noc1 !< number of connections in in_mp1
3464
3465	INTEGER, DIMENSION(:), ALLOCATABLE :: dum_cv !< dummy array for connected_vertices
3466
3467	REAL(wp) :: dist !< Distance between the two points
3468
3469	REAL(wp), DIMENSION(:), ALLOCATABLE :: dum_dtv
3470
3471	TYPE(mesh_point) :: in_mp1 !< mesh point that gets a new connection
3472	TYPE(mesh_point) :: in_mp2 !< mesh point in_mp1 will be connected to
3473
3474	connection_established = .FALSE.
3475	!
3476	!-- Check if connection has already been established
3477	noc1 = SIZE(in_mp1%connected_vertices)
3478	DO il = 1, in_mp1%noc
3479	IF ( in_mp1%connected_vertices(il) == id2 ) THEN
3480	connection_established = .TRUE.
3481	EXIT
3482	ENDIF
3483	ENDDO
3484
3485	IF ( .NOT. connection_established ) THEN
3486	!
3487	!-- Resize arrays, if necessary
3488	IF ( in_mp1%noc >= noc1 ) THEN
3489	ALLOCATE( dum_cv(1:noc1),dum_dtv(1:noc1) )
3490	dum_cv = in_mp1%connected_vertices
3491	dum_dtv = in_mp1%distance_to_vertex
3492	DEALLOCATE( in_mp1%connected_vertices, in_mp1%distance_to_vertex )
3493	ALLOCATE( in_mp1%connected_vertices(1:2*noc1), &
3494	in_mp1%distance_to_vertex(1:2*noc1) )
3495	in_mp1%connected_vertices = -999
3496	in_mp1%distance_to_vertex = -999.
3497	in_mp1%connected_vertices(1:noc1) = dum_cv
3498	in_mp1%distance_to_vertex(1:noc1) = dum_dtv
3499	ENDIF
3500
3501	!
3502	!-- Add connection
3503	in_mp1%noc = in_mp1%noc+1
3504	dist = SQRT( (in_mp1%x - in_mp2%x)2 + (in_mp1%y - in_mp2%y)2 )
3505	in_mp1%connected_vertices(in_mp1%noc) = id2
3506	in_mp1%distance_to_vertex(in_mp1%noc) = dist
3507	ENDIF
3508
3509	END SUBROUTINE mas_nav_add_connection
3510
3511	!------------------------------------------------------------------------------!
3512	! Description:
3513	! ------------
3514	!> Adds a vertex (curren position of agent or target) to the existing tmp_mesh
3515	!------------------------------------------------------------------------------!
3516	SUBROUTINE mas_nav_add_vertex_to_mesh ( in_mp, in_id )
3517
3518	IMPLICIT NONE
3519
3520	LOGICAL :: intersection_found !< flag
3521
3522	INTEGER(iwp) :: jl !< mesh point counter
3523	INTEGER(iwp) :: pl !< polygon counter
3524	INTEGER(iwp) :: vl !< vertex counter
3525	INTEGER(iwp) :: pid_t !< polygon id of tested mesh point
3526	INTEGER(iwp) :: vid_t !< vertex id of tested mesh point
3527	INTEGER(iwp) :: in_id !< vertex id of tested mesh point
3528
3529	LOGICAL :: is_left_n !< local switch
3530	LOGICAL :: is_left_p !< local switch
3531	LOGICAL :: is_right_n !< local switch
3532	LOGICAL :: is_right_p !< local switch
3533
3534	REAL(wp) :: v1x !< x-coordinate of test vertex 1 for intersection test
3535	REAL(wp) :: v1y !< y-coordinate of test vertex 1 for intersection test
3536	REAL(wp) :: v2x !< x-coordinate of test vertex 2 for intersection test
3537	REAL(wp) :: v2y !< y-coordinate of test vertex 2 for intersection test
3538	REAL(wp) :: x !< x-coordinate of current mesh point
3539	REAL(wp) :: x_t !< x-coordinate of tested mesh point
3540	REAL(wp) :: y !< y-coordinate of current mesh point
3541	REAL(wp) :: y_t !< y-coordinate of tested mesh point
3542
3543	TYPE(mesh_point) :: in_mp !< Input mesh point
3544	!
3545	!--
3546	x = in_mp%x
3547	y = in_mp%y
3548	DO jl = 0, SIZE(tmp_mesh)-2
3549	IF ( in_id == jl ) CYCLE
3550	!
3551	!-- Ignore mesh points with 0 connections
3552	IF ( tmp_mesh(jl)%polygon_id /= -1 ) THEN
3553	IF ( tmp_mesh(jl)%noc == 0 ) CYCLE
3554	ENDIF
3555	x_t = tmp_mesh(jl)%x
3556	y_t = tmp_mesh(jl)%y
3557	pid_t = tmp_mesh(jl)%polygon_id
3558	vid_t = tmp_mesh(jl)%vertex_id
3559	!
3560	!-- If the connecting line between the target and a mesh point points
3561	!-- into the mesh point's polygon, no connection will be
3562	!-- established between the two points. This is the case if the
3563	!-- previous (next, n) vertex of the polygon is right of the connecting
3564	!-- line and the next (previous, p) vertex of the polygon is left of the
3565	!-- connecting line.
3566	IF ( pid_t > 0 .AND. pid_t <= SIZE( polygons ) ) THEN
3567	is_left_p = is_left( x, y, x_t, y_t, polygons(pid_t)%vertices(vid_t-1)%x, &
3568	polygons(pid_t)%vertices(vid_t-1)%y )
3569	is_left_n = is_left( x, y, x_t, y_t, polygons(pid_t)%vertices(vid_t+1)%x, &
3570	polygons(pid_t)%vertices(vid_t+1)%y )
3571	is_right_p = is_right( x, y, x_t, y_t, polygons(pid_t)%vertices(vid_t-1)%x, &
3572	polygons(pid_t)%vertices(vid_t-1)%y )
3573	is_right_n = is_right( x, y, x_t, y_t, polygons(pid_t)%vertices(vid_t+1)%x, &
3574	polygons(pid_t)%vertices(vid_t+1)%y )
3575	IF ( ( is_left_p .AND. is_right_n ) .OR. ( is_right_p .AND. is_left_n ) ) CYCLE
3576	ENDIF
3577	!
3578	!-- For each edge of each polygon, check if it intersects with the
3579	!-- potential connection. If at least one intersection is found,
3580	!-- no connection can be made
3581	intersection_found = .FALSE.
3582	DO pl = 1, SIZE(polygons)
3583	DO vl = 1, polygons(pl)%nov
3584	v1x = polygons(pl)%vertices(vl)%x
3585	v1y = polygons(pl)%vertices(vl)%y
3586	v2x = polygons(pl)%vertices(vl+1)%x
3587	v2y = polygons(pl)%vertices(vl+1)%y
3588	intersection_found = intersect(x,y,x_t,y_t,v1x,v1y,v2x,v2y)
3589	IF ( intersection_found ) THEN
3590	EXIT
3591	ENDIF
3592	ENDDO
3593	IF ( intersection_found ) EXIT
3594	ENDDO
3595	IF ( intersection_found ) CYCLE
3596	!
3597	!-- If neither of the above two test was true, a connection will be
3598	!-- established between the two mesh points.
3599	CALL mas_nav_add_connection(in_mp,jl, tmp_mesh(jl))
3600	CALL mas_nav_add_connection(tmp_mesh(jl),in_id, in_mp)
3601	ENDDO
3602	CALL mas_nav_reduce_connections(in_mp)
3603
3604	END SUBROUTINE mas_nav_add_vertex_to_mesh
3605
3606	!------------------------------------------------------------------------------!
3607	! Description:
3608	! ------------
3609	!> Creates a temporary copy of the navigation mesh to be used for pathfinding
3610	!------------------------------------------------------------------------------!
3611	SUBROUTINE mas_nav_create_tmp_mesh( a_x, a_y, t_x, t_y, som )
3612
3613	IMPLICIT NONE
3614
3615	INTEGER(iwp) :: som !< size of mesh
3616	INTEGER(iwp) :: noc !< number of connetions
3617	INTEGER(iwp) :: im !< local mesh point counter
3618
3619	REAL(wp) :: a_x !< x-coordinate agent
3620	REAL(wp) :: a_y !< y-coordinate agent
3621	REAL(wp) :: t_x !< x-coordinate target
3622	REAL(wp) :: t_y !< y-coordinate target
3623	!
3624	!-- give tmp_mesh the size of mesh
3625	som = SIZE(mesh)+1
3626	ALLOCATE(tmp_mesh(0:som))
3627	!
3628	!-- give the allocatable variables in tmp_mesh their respctive sizes
3629	DO im = 1, som-1
3630	noc = mesh(im)%noc
3631	ALLOCATE(tmp_mesh(im)%connected_vertices(1:noc))
3632	ALLOCATE(tmp_mesh(im)%distance_to_vertex(1:noc))
3633	ENDDO
3634	!
3635	!-- copy mesh to tmp_mesh
3636	tmp_mesh(1:som-1) = mesh(1:som-1)
3637	!
3638	!-- Add target point ...
3639	CALL mas_nav_init_mesh_point(tmp_mesh(0),-1_iwp,-1_iwp,t_x, t_y)
3640	CALL mas_nav_add_vertex_to_mesh(tmp_mesh(0),0_iwp)
3641	!
3642	!-- ... and start point to temp mesh
3643	CALL mas_nav_init_mesh_point(tmp_mesh(som),-1_iwp,-1_iwp,a_x, a_y)
3644	CALL mas_nav_add_vertex_to_mesh(tmp_mesh(som),som)
3645
3646	END SUBROUTINE mas_nav_create_tmp_mesh
3647
3648
3649	!------------------------------------------------------------------------------!
3650	! Description:
3651	! ------------
3652	!> Finds the shortest path from an agents' position to her target. As the
3653	!> actual pathfinding algorithm uses the obstacle corners and then shifts them
3654	!> outward after pathfinding, cases can uccur in which the connection between
3655	!> these intermittent targets then intersect with obstacles. To remedy this
3656	!> the pathfinding algorithm is then run on every two subsequent intermittent
3657	!> targets iteratively and new intermittent targets may be added to the path
3658	!> this way.
3659	!------------------------------------------------------------------------------!
3660	SUBROUTINE mas_nav_find_path( nl )
3661
3662	IMPLICIT NONE
3663
3664	INTEGER(iwp) :: nl !< local agent counter
3665	INTEGER(iwp) :: il !< local counter
3666	INTEGER(iwp) :: jl !< local counter
3667	INTEGER(iwp) :: kl !< local counter
3668	INTEGER(iwp) :: nsteps_total !< number of steps on path
3669	INTEGER(iwp) :: nsteps_dummy !< number of steps on path
3670
3671	REAL(wp), DIMENSION(0:30) :: ld_path_x !< local dummy agent path to target (x)
3672	REAL(wp), DIMENSION(0:30) :: ld_path_y !< local dummy agent path to target (y)
3673	!
3674	!-- Initialize agent path arrays
3675	agents(nl)%path_x = -1
3676	agents(nl)%path_y = -1
3677	agents(nl)%path_x(0) = agents(nl)%x
3678	agents(nl)%path_y(0) = agents(nl)%y
3679	!
3680	!-- Calculate initial path
3681	CALL mas_nav_a_star( agents(nl)%x, agents(nl)%y, &
3682	agents(nl)%t_x, agents(nl)%t_y, nsteps_total )
3683	!
3684	!-- Set the rest of the agent path that was just calculated
3685	agents(nl)%path_x(1:nsteps_total) = dummy_path_x(1:nsteps_total)
3686	agents(nl)%path_y(1:nsteps_total) = dummy_path_y(1:nsteps_total)
3687	!
3688	!-- Iterate through found path and check more intermittent targets need
3689	!-- to be added. For this, run pathfinding between every two consecutive
3690	!-- intermittent targets.
3691	DO il = 0, MIN(agt_path_size-1, nsteps_total-1)
3692	!
3693	!-- pathfinding between two consecutive intermittent targets
3694	CALL mas_nav_a_star( agents(nl)%path_x(il), agents(nl)%path_y(il), &
3695	agents(nl)%path_x(il+1), agents(nl)%path_y(il+1),&
3696	nsteps_dummy )
3697	nsteps_dummy = nsteps_dummy - 1
3698	!
3699	!-- If additional intermittent targets are found, add them to the path
3700	IF ( nsteps_dummy > 0 ) THEN
3701	ld_path_x = -1
3702	ld_path_y = -1
3703	ld_path_x(il+1:il+nsteps_dummy) = dummy_path_x(1:nsteps_dummy)
3704	ld_path_y(il+1:il+nsteps_dummy) = dummy_path_y(1:nsteps_dummy)
3705	kl = 1
3706	DO jl = il+1,nsteps_total
3707	ld_path_x( il+nsteps_dummy+kl ) = agents(nl)%path_x(jl)
3708	ld_path_y( il+nsteps_dummy+kl ) = agents(nl)%path_y(jl)
3709	kl = kl + 1
3710	IF ( kl > agt_path_size ) EXIT
3711	ENDDO
3712	nsteps_total = MIN(nsteps_total + nsteps_dummy, agt_path_size)
3713	agents(nl)%path_x(il+1:nsteps_total) = ld_path_x(il+1:nsteps_total)
3714	agents(nl)%path_y(il+1:nsteps_total) = ld_path_y(il+1:nsteps_total)
3715	ENDIF
3716
3717	ENDDO
3718	!
3719	!-- reset path counter to first intermittent target
3720	agents(nl)%path_counter = 1
3721
3722	END SUBROUTINE mas_nav_find_path
3723
3724	!------------------------------------------------------------------------------!
3725	! Description:
3726	! ------------
3727	!> Reduces the size of connection array to the amount of actual connections
3728	!> after all connetions were added to a mesh point
3729	!------------------------------------------------------------------------------!
3730	SUBROUTINE mas_nav_reduce_connections ( in_mp )
3731
3732	IMPLICIT NONE
3733
3734	INTEGER(iwp) :: noc !< number of connections
3735
3736	INTEGER, DIMENSION(:), ALLOCATABLE :: dum_cv !< dummy connected_vertices
3737
3738	REAL(wp), DIMENSION(:), ALLOCATABLE :: dum_dtv !< dummy distance_to_vertex
3739
3740	TYPE(mesh_point) :: in_mp
3741
3742	noc = in_mp%noc
3743	ALLOCATE( dum_cv(1:noc),dum_dtv(1:noc) )
3744	dum_cv = in_mp%connected_vertices(1:noc)
3745	dum_dtv = in_mp%distance_to_vertex(1:noc)
3746	DEALLOCATE( in_mp%connected_vertices, in_mp%distance_to_vertex )
3747	ALLOCATE( in_mp%connected_vertices(1:noc), &
3748	in_mp%distance_to_vertex(1:noc) )
3749	in_mp%connected_vertices(1:noc) = dum_cv(1:noc)
3750	in_mp%distance_to_vertex(1:noc) = dum_dtv(1:noc)
3751
3752	END SUBROUTINE mas_nav_reduce_connections
3753
3754	!------------------------------------------------------------------------------!
3755	! Description:
3756	! ------------
3757	!> Initializes a point of the navigation mesh
3758	!------------------------------------------------------------------------------!
3759	SUBROUTINE mas_nav_init_mesh_point ( in_mp, pid, vid, x, y )
3760
3761	IMPLICIT NONE
3762
3763	INTEGER(iwp) :: pid !< polygon ID
3764	INTEGER(iwp) :: vid !< vertex ID
3765
3766	REAL(wp) :: x !< x-coordinate
3767	REAL(wp) :: y !< y-coordinate
3768
3769	TYPE(mesh_point) :: in_mp !< mesh point to be initialized
3770
3771	in_mp%origin_id = -1
3772	in_mp%polygon_id = pid
3773	in_mp%vertex_id = vid
3774	in_mp%cost_so_far = 1.d12
3775	in_mp%x = x
3776	in_mp%y = y
3777	in_mp%x_s = x
3778	in_mp%y_s = y
3779	ALLOCATE(in_mp%connected_vertices(1:100), &
3780	in_mp%distance_to_vertex(1:100))
3781	in_mp%connected_vertices = -999
3782	in_mp%distance_to_vertex = -999.
3783	in_mp%noc = 0
3784
3785	END SUBROUTINE mas_nav_init_mesh_point
3786
3787	!------------------------------------------------------------------------------!
3788	! Description:
3789	! ------------
3790	!> Reading of namlist from parin file
3791	!------------------------------------------------------------------------------!
3792	SUBROUTINE mas_parin
3793
3794	USE control_parameters, &
3795	ONLY: agent_time_unlimited, multi_agent_system_end, &
3796	multi_agent_system_start
3797
3798	IMPLICIT NONE
3799
3800	CHARACTER (LEN=80) :: line !<
3801
3802	NAMELIST /agent_parameters/ a_rand_target, &
3803	adx, &
3804	ady, &
3805	agent_maximum_age, &
3806	agent_time_unlimited, &
3807	alloc_factor_mas, &
3808	asl, &
3809	asn, &
3810	asr, &
3811	ass, &
3812	at_x, &
3813	at_y, &
3814	bc_mas_lr, &
3815	bc_mas_ns, &
3816	coll_t_0, &
3817	corner_gate_start, &
3818	corner_gate_width, &
3819	dim_size_agtnum_manual, &
3820	dim_size_factor_agtnum, &
3821	deallocate_memory_mas, &
3822	dist_to_int_target, &
3823	dt_agent, &
3824	dt_arel, &
3825	dt_write_agent_data, &
3826	end_time_arel, &
3827	max_dist_from_path, &
3828	min_nr_agent, &
3829	multi_agent_system_end, &
3830	multi_agent_system_start, &
3831	number_of_agent_groups, &
3832	radius_agent, &
3833	random_start_position_agents, &
3834	read_agents_from_restartfile, &
3835	repuls_agent, &
3836	repuls_wall, &
3837	scan_radius_agent, &
3838	sigma_rep_agent, &
3839	sigma_rep_wall, &
3840	step_dealloc_mas, &
3841	tau_accel_agent
3842
3843	!
3844	!-- Try to find agent package
3845	REWIND ( 11 )
3846	line = ' '
3847	DO WHILE ( INDEX( line, '&agent_parameters' ) == 0 )
3848	READ ( 11, '(A)', END=20 ) line
3849	ENDDO
3850	BACKSPACE ( 11 )
3851
3852	!
3853	!-- Read user-defined namelist
3854	READ ( 11, agent_parameters, ERR = 10, END = 20 )
3855
3856	!
3857	!-- Set flag that indicates that agents are switched on
3858	agents_active = .TRUE.
3859	GOTO 20
3860
3861	10 BACKSPACE( 11 )
3862	READ( 11 , '(A)') line
3863	CALL parin_fail_message( 'agent_parameters', line )
3864
3865	20 CONTINUE
3866
3867	END SUBROUTINE mas_parin
3868
3869	!------------------------------------------------------------------------------!
3870	! Description:
3871	! ------------
3872	!> Routine for the whole processor
3873	!> Sort all agents into the 4 respective subgrid boxes
3874	!------------------------------------------------------------------------------!
3875	SUBROUTINE mas_ps_sort_in_subboxes
3876
3877	IMPLICIT NONE
3878
3879	INTEGER(iwp) :: i !< grid box (x)
3880	INTEGER(iwp) :: ip !< counter (x)
3881	INTEGER(iwp) :: is !< box counter
3882	INTEGER(iwp) :: j !< grid box (y)
3883	INTEGER(iwp) :: jp !< counter (y)
3884	INTEGER(iwp) :: m !< sorting index
3885	INTEGER(iwp) :: n !< agent index
3886	INTEGER(iwp) :: nn !< agent counter
3887	INTEGER(iwp) :: sort_index !< sorting index
3888
3889	INTEGER(iwp), DIMENSION(0:3) :: sort_count !< number of agents in one subbox
3890
3891	TYPE(agent_type), DIMENSION(:,:), ALLOCATABLE :: sort_agents !< sorted agent array
3892
3893	DO ip = nxl, nxr
3894	DO jp = nys, nyn
3895	number_of_agents = agt_count(jp,ip)
3896	IF ( number_of_agents <= 0 ) CYCLE
3897	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
3898
3899	nn = 0
3900	sort_count = 0
3901	ALLOCATE( sort_agents(number_of_agents, 0:3) )
3902
3903	DO n = 1, number_of_agents
3904	sort_index = 0
3905
3906	IF ( agents(n)%agent_mask ) THEN
3907	nn = nn + 1
3908	!
3909	!-- Sorting agents with a binary scheme
3910	!-- sort_index=11_2=3_10 -> agent at the left,south subgridbox
3911	!-- sort_index=10_2=2_10 -> agent at the left,north subgridbox
3912	!-- sort_index=01_2=1_10 -> agent at the right,south subgridbox
3913	!-- sort_index=00_2=0_10 -> agent at the right,north subgridbox
3914	!-- For this the center of the gridbox is calculated
3915	i = (agents(n)%x + 0.5_wp * dx) * ddx
3916	j = (agents(n)%y + 0.5_wp * dy) * ddy
3917
3918	IF ( i == ip ) sort_index = sort_index + 2
3919	IF ( j == jp ) sort_index = sort_index + 1
3920
3921	sort_count(sort_index) = sort_count(sort_index) + 1
3922	m = sort_count(sort_index)
3923	sort_agents(m,sort_index) = agents(n)
3924	sort_agents(m,sort_index)%block_nr = sort_index
3925	ENDIF
3926	ENDDO
3927
3928	nn = 0
3929	DO is = 0,3
3930	grid_agents(jp,ip)%start_index(is) = nn + 1
3931	DO n = 1,sort_count(is)
3932	nn = nn + 1
3933	agents(nn) = sort_agents(n,is)
3934	ENDDO
3935	grid_agents(jp,ip)%end_index(is) = nn
3936	ENDDO
3937
3938	number_of_agents = nn
3939	agt_count(jp,ip) = number_of_agents
3940	DEALLOCATE(sort_agents)
3941	ENDDO
3942	ENDDO
3943
3944	END SUBROUTINE mas_ps_sort_in_subboxes
3945
3946	#if defined( __parallel )
3947	!------------------------------------------------------------------------------!
3948	! Description:
3949	! ------------
3950	!> Move all agents not marked for deletion to lowest indices (packing)
3951	!------------------------------------------------------------------------------!
3952	SUBROUTINE mas_ps_pack
3953
3954	IMPLICIT NONE
3955
3956	INTEGER(iwp) :: n !< agent counter
3957	INTEGER(iwp) :: nn !< number of agents
3958	!
3959	!-- Find out elements marked for deletion and move data from highest index
3960	!-- values to these free indices
3961	nn = number_of_agents
3962
3963	DO WHILE ( .NOT. agents(nn)%agent_mask )
3964	nn = nn-1
3965	IF ( nn == 0 ) EXIT
3966	ENDDO
3967
3968	IF ( nn > 0 ) THEN
3969	DO n = 1, number_of_agents
3970	IF ( .NOT. agents(n)%agent_mask ) THEN
3971	agents(n) = agents(nn)
3972	nn = nn - 1
3973	DO WHILE ( .NOT. agents(nn)%agent_mask )
3974	nn = nn-1
3975	IF ( n == nn ) EXIT
3976	ENDDO
3977	ENDIF
3978	IF ( n == nn ) EXIT
3979	ENDDO
3980	ENDIF
3981
3982	!
3983	!-- The number of deleted agents has been determined in routines
3984	!-- mas_boundary_conds, mas_droplet_collision, and mas_eh_exchange_horiz
3985	number_of_agents = nn
3986
3987	END SUBROUTINE mas_ps_pack
3988	#endif
3989
3990	!------------------------------------------------------------------------------!
3991	! Description:
3992	! ------------
3993	!> Sort agents in each sub-grid box into two groups: agents that already
3994	!> completed the LES timestep, and agents that need further timestepping to
3995	!> complete the LES timestep.
3996	!------------------------------------------------------------------------------!
3997	! SUBROUTINE mas_ps_sort_timeloop_done
3998	!
3999	! IMPLICIT NONE
4000	!
4001	! INTEGER(iwp) :: end_index !< agent end index for each sub-box
4002	! INTEGER(iwp) :: i !< index of agent grid box in x-direction
4003	! INTEGER(iwp) :: j !< index of agent grid box in y-direction
4004	! INTEGER(iwp) :: n !< running index for number of agents
4005	! INTEGER(iwp) :: nb !< index of subgrid boux
4006	! INTEGER(iwp) :: nf !< indices for agents in each sub-box that already finalized their substeps
4007	! INTEGER(iwp) :: nnf !< indices for agents in each sub-box that need further treatment
4008	! INTEGER(iwp) :: num_finalized !< number of agents in each sub-box that already finalized their substeps
4009	! INTEGER(iwp) :: start_index !< agent start index for each sub-box
4010	!
4011	! TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: sort_agents !< temporary agent array
4012	!
4013	! DO i = nxl, nxr
4014	! DO j = nys, nyn
4015	!
4016	! number_of_agents = agt_count(j,i)
4017	! IF ( number_of_agents <= 0 ) CYCLE
4018	!
4019	! agents => grid_agents(j,i)%agents(1:number_of_agents)
4020	!
4021	! DO nb = 0, 3
4022	!
4023	!-- Obtain start and end index for each subgrid box
4024	! start_index = grid_agents(j,i)%start_index(nb)
4025	! end_index = grid_agents(j,i)%end_index(nb)
4026	!
4027	!-- Allocate temporary array used for sorting
4028	! ALLOCATE( sort_agents(start_index:end_index) )
4029	!
4030	!-- Determine number of agents already completed the LES
4031	!-- timestep, and write them into a temporary array
4032	! nf = start_index
4033	! num_finalized = 0
4034	! DO n = start_index, end_index
4035	! IF ( dt_3d - agents(n)%dt_sum < 1E-8_wp ) THEN
4036	! sort_agents(nf) = agents(n)
4037	! nf = nf + 1
4038	! num_finalized = num_finalized + 1
4039	! ENDIF
4040	! ENDDO
4041	!
4042	!-- Determine number of agents that not completed the LES
4043	!-- timestep, and write them into a temporary array
4044	! nnf = nf
4045	! DO n = start_index, end_index
4046	! IF ( dt_3d - agents(n)%dt_sum > 1E-8_wp ) THEN
4047	! sort_agents(nnf) = agents(n)
4048	! nnf = nnf + 1
4049	! ENDIF
4050	! ENDDO
4051	!
4052	!-- Write back sorted agents
4053	! agents(start_index:end_index) = &
4054	! sort_agents(start_index:end_index)
4055	!
4056	!-- Determine updated start_index, used to masked already
4057	!-- completed agents.
4058	! grid_agents(j,i)%start_index(nb) = &
4059	! grid_agents(j,i)%start_index(nb) &
4060	! + num_finalized
4061	!
4062	!-- Deallocate dummy array
4063	! DEALLOCATE ( sort_agents )
4064	!
4065	!-- Finally, if number of non-completed agents is non zero
4066	!-- in any of the sub-boxes, set control flag appropriately.
4067	! IF ( nnf > nf ) &
4068	! grid_agents(j,i)%time_loop_done = .FALSE.
4069	!
4070	! ENDDO
4071	! ENDDO
4072	! ENDDO
4073	!
4074	! END SUBROUTINE mas_ps_sort_timeloop_done
4075
4076	!------------------------------------------------------------------------------!
4077	! Description:
4078	! ------------
4079	!> Calls social forces calculations
4080	!------------------------------------------------------------------------------!
4081	SUBROUTINE mas_timestep_forces_call ( ip, jp )
4082
4083	IMPLICIT NONE
4084
4085	INTEGER(iwp) :: ip !< counter, x-direction
4086	INTEGER(iwp) :: jp !< counter, y-direction
4087	INTEGER(iwp) :: n !< loop variable over all agents in a grid box
4088
4089	!
4090	!-- Get direction for all agents in current grid cell
4091	CALL mas_agent_direction
4092
4093	DO n = 1, number_of_agents
4094
4095	force_x = 0.0_wp
4096	force_y = 0.0_wp
4097
4098	CALL mas_timestep_social_forces ( 'acceleration', n, ip, jp )
4099
4100	CALL mas_timestep_social_forces ( 'other_agents', n, ip, jp )
4101
4102	CALL mas_timestep_social_forces ( 'walls', n, ip, jp )
4103	!
4104	!-- Update forces
4105	agents(n)%force_x = force_x
4106	agents(n)%force_y = force_y
4107	ENDDO
4108
4109	END SUBROUTINE mas_timestep_forces_call
4110
4111	!------------------------------------------------------------------------------!
4112	! Description:
4113	! ------------
4114	!> Euler timestep of agent transport
4115	!------------------------------------------------------------------------------!
4116	SUBROUTINE mas_timestep
4117
4118	IMPLICIT NONE
4119
4120	INTEGER(iwp) :: n !< loop variable over all agents in a grid box
4121
4122	REAL(wp) :: abs_v !< absolute value of velocity
4123	REAL(wp) :: abs_f !< absolute value of force
4124
4125	DO n = 1, number_of_agents
4126	!
4127	!-- Limit absolute force to a maximum to prevent unrealistic acceleration
4128	abs_f = SQRT((agents(n)%force_x)2 + (agents(n)%force_y)2)
4129	IF ( abs_f > 20. ) THEN
4130	agents(n)%force_x = agents(n)%force_x * 20. / abs_f
4131	agents(n)%force_y = agents(n)%force_y * 20. / abs_f
4132	ENDIF
4133	!
4134	!-- Update agent speed
4135	agents(n)%speed_x = agents(n)%speed_x + agents(n)%force_x * dt_agent
4136	agents(n)%speed_y = agents(n)%speed_y + agents(n)%force_y * dt_agent
4137	!
4138	!-- Reduction of agent speed to maximum agent speed
4139	abs_v = SQRT((agents(n)%speed_x)2 + (agents(n)%speed_y)2)
4140	IF ( abs_v > v_max_agent ) THEN
4141	agents(n)%speed_x = agents(n)%speed_x * v_max_agent / abs_v
4142	agents(n)%speed_y = agents(n)%speed_y * v_max_agent / abs_v
4143	ENDIF
4144	!
4145	!-- Update agent position
4146	agents(n)%x = agents(n)%x + agents(n)%speed_x * dt_agent
4147	agents(n)%y = agents(n)%y + agents(n)%speed_y * dt_agent
4148	!
4149	!-- Update absolute value of agent speed
4150	agents(n)%speed_abs = abs_v
4151	!
4152	!-- Increment the agent age and the total time that the agent
4153	!-- has advanced within the agent timestep procedure
4154	agents(n)%age_m = agents(n)%age
4155	agents(n)%age = agents(n)%age + dt_agent
4156	agents(n)%dt_sum = agents(n)%dt_sum + dt_agent
4157	!
4158	!-- Check whether there is still an agent that has not yet completed
4159	!-- the total LES timestep
4160	IF ( ( dt_3d - agents(n)%dt_sum ) > 1E-8_wp ) THEN
4161	dt_3d_reached_l_mas = .FALSE.
4162	ENDIF
4163
4164	ENDDO
4165
4166	END SUBROUTINE mas_timestep
4167
4168	!------------------------------------------------------------------------------!
4169	! Description:
4170	! ------------
4171	!> Calculates the Social Forces (Helbing and Molnar, 1995) that the agent
4172	!> experiences due to acceleration towards target and repulsion by obstacles
4173	!------------------------------------------------------------------------------!
4174	SUBROUTINE mas_timestep_social_forces ( mode, nl, ip, jp )
4175
4176	IMPLICIT NONE
4177
4178	CHARACTER (LEN=*) :: mode !< identifier for the mode of calculation
4179
4180	INTEGER(iwp) :: ij_dum !< index of nearest wall
4181	INTEGER(iwp) :: il !< index variable along x
4182	INTEGER(iwp) :: ip !< index variable along x
4183	INTEGER(iwp) :: jl !< index variable along y
4184	INTEGER(iwp) :: jp !< index variable along y
4185	INTEGER(iwp) :: nl !< loop variable over all agents in a grid box
4186	INTEGER(iwp) :: no !< loop variable over all agents in a grid box
4187	INTEGER(iwp) :: noa !< amount of agents in a grid box
4188	INTEGER(iwp) :: sc_x_end !< index for scan for topography/other agents
4189	INTEGER(iwp) :: sc_x_start !< index for scan for topography/other agents
4190	INTEGER(iwp) :: sc_y_end !< index for scan for topography/other agents
4191	INTEGER(iwp) :: sc_y_start !< index for scan for topography/other agents
4192
4193	LOGICAL :: corner_found !< flag that indicates a corner has been found near agent
4194
4195	REAL(wp) :: a_pl !< factor for collision avoidance
4196	REAL(wp) :: ax_semimaj !< semiminor axis of repulsive ellipse
4197	REAL(wp) :: b_pl !< factor for collision avoidance
4198	REAL(wp) :: c_pl !< factor for collision avoidance
4199	REAL(wp) :: coll_t !< time at which the next collision would happen
4200	REAL(wp) :: d_coll_t_0 !< inverse of collision cutoff time
4201	REAL(wp) :: d_pl !< factor for collision avoidance
4202	REAL(wp) :: ddum_f !< dummy devisor collision avoidance
4203	REAL(wp) :: dist !< distance to obstacle
4204	REAL(wp) :: dist_sq !< distance to obstacle squared
4205	REAL(wp) :: pos_rel_x !< relative position of two agents (x)
4206	REAL(wp) :: pos_rel_y !< relative position of two agents (y)
4207	REAL(wp) :: r_sq !< y-position
4208	REAL(wp) :: sra !< scan radius (agents)
4209	REAL(wp) :: srw !< local variable for scan radius (walls)
4210	REAL(wp) :: v_rel_x !< relative velocity (x); collision avoidance
4211	REAL(wp) :: v_rel_y !< relative velocity (y); collision avoidance
4212	REAL(wp) :: x_a !< x-position
4213	REAL(wp) :: x_wall !< x-position of wall
4214	REAL(wp) :: y_a !< y-position
4215	REAL(wp) :: y_wall !< y-position of wall
4216
4217	REAL(wp), PARAMETER :: k_pl = 1.5 !< factor for collision avoidance
4218
4219	TYPE(agent_type), DIMENSION(:), POINTER :: l_agts !< agents that repulse current agent
4220
4221	!
4222	!-- Initialization
4223	x_a = agents(nl)%x
4224	y_a = agents(nl)%y
4225
4226	SELECT CASE ( TRIM( mode ) )
4227	!
4228	!-- Calculation of force due to agent trying to approach desired velocity
4229	CASE ( 'acceleration' )
4230
4231	force_x = force_x + d_tau_accel_agent &
4232	* ( agents(nl)%speed_des*agents(nl)%speed_e_x &
4233	-agents(nl)%speed_x )
4234
4235	force_y = force_y + d_tau_accel_agent &
4236	* ( agents(nl)%speed_des*agents(nl)%speed_e_y &
4237	-agents(nl)%speed_y )
4238
4239	!
4240	!-- Calculation of repulsive forces by other agents in a radius around the
4241	!-- current one
4242	CASE ( 'other_agents' )
4243
4244	sra = scan_radius_agent
4245	d_coll_t_0 = 1./coll_t_0
4246	!
4247	!-- Find relevant gridboxes (those that could contain agents within
4248	!-- scan radius)
4249	sc_x_start = FLOOR( (x_a - sra) * ddx )
4250	sc_x_end = FLOOR( (x_a + sra) * ddx )
4251	sc_y_start = FLOOR( (y_a - sra) * ddx )
4252	sc_y_end = FLOOR( (y_a + sra) * ddx )
4253	IF ( sc_x_start < nxlg ) sc_x_start = nxlg
4254	IF ( sc_x_end > nxrg ) sc_x_end = nxrg
4255	IF ( sc_y_start < nysg ) sc_y_start = nysg
4256	IF ( sc_y_end > nyng ) sc_y_end = nyng
4257
4258	sra = sra**2
4259	!
4260	!-- Loop over all previously found relevant gridboxes
4261	DO il = sc_x_start, sc_x_end
4262	DO jl = sc_y_start, sc_y_end
4263	noa = agt_count(jl,il)
4264	IF ( noa <= 0 ) CYCLE
4265	l_agts => grid_agents(jl,il)%agents(1:noa)
4266	DO no = 1, noa
4267	!
4268	!-- Skip self
4269	IF ( jl == jp .AND. il == ip .AND. no == nl ) CYCLE
4270	pos_rel_x = l_agts(no)%x - x_a
4271	pos_rel_y = l_agts(no)%y - y_a
4272	dist_sq = pos_rel_x2 + pos_rel_y2
4273	IF ( dist_sq > sra ) CYCLE
4274	r_sq = (2radius_agent)*2
4275	v_rel_x = agents(nl)%speed_x - l_agts(no)%speed_x
4276	v_rel_y = agents(nl)%speed_y - l_agts(no)%speed_y
4277	!
4278	!-- Collision is already occuring, default to standard
4279	!-- social forces
4280	IF ( dist_sq <= r_sq ) THEN
4281	dist = SQRT(dist_sq) + 1.0d-12
4282	ax_semimaj = .5_wp*SQRT( dist )
4283
4284	force_x = force_x - 0.125_wp * repuls_agent &
4285	* d_sigma_rep_agent / ax_semimaj &
4286	* EXP( -ax_semimaj*d_sigma_rep_agent ) &
4287	* (pos_rel_x/dist)
4288
4289	force_y = force_y - 0.125_wp * repuls_agent &
4290	* d_sigma_rep_agent / ax_semimaj &
4291	* EXP( -ax_semimaj*d_sigma_rep_agent ) &
4292	* (pos_rel_y/dist)
4293	!
4294	!-- Currently no collision, calculate collision avoidance
4295	!-- force according to Karamouzas et al (2014, PRL 113,238701)
4296	ELSE
4297	!
4298	!-- factors
4299	a_pl = v_rel_x2 + v_rel_y2
4300	b_pl = pos_rel_xv_rel_x + pos_rel_yv_rel_y
4301	c_pl = dist_sq - r_sq
4302	d_pl = b_pl*2 - a_plc_pl
4303	!
4304	!-- If the two agents are moving non-parallel, calculate
4305	!-- collision avoidance social force
4306	IF ( d_pl > 0.0_wp .AND. &
4307	( a_pl < -0.00001 .OR. a_pl > 0.00001 ) ) &
4308	THEN
4309
4310	d_pl = SQRT(d_pl)
4311	coll_t = (b_pl - d_pl)/a_pl
4312	IF ( coll_t > 0.0_wp ) THEN
4313	!
4314	!-- Dummy factor
4315	ddum_f = 1. / ( a_pl * coll_t**2 ) &
4316	* ( 2. / coll_t + 1.0 * d_coll_t_0 )
4317	!
4318	!-- x-component of social force
4319	force_x = force_x - k_pl * &
4320	EXP( -coll_t * d_coll_t_0 ) * &
4321	( v_rel_x - &
4322	( b_pl * v_rel_x - &
4323	a_pl * pos_rel_x ) / d_pl ) * &
4324	ddum_f
4325	!
4326	!-- y-component of social force
4327	force_y = force_y - k_pl * &
4328	EXP( -coll_t * d_coll_t_0 ) * &
4329	( v_rel_y - &
4330	( b_pl * v_rel_y - &
4331	a_pl * pos_rel_y ) / d_pl ) * &
4332	ddum_f
4333
4334	ENDIF
4335	ENDIF
4336	ENDIF
4337	ENDDO
4338	ENDDO
4339	ENDDO
4340
4341	CASE ( 'walls' )
4342
4343	srw = scan_radius_wall
4344	corner_found = .FALSE.
4345	!
4346	!-- find relevant grid boxes (those that could contain topography
4347	!-- within radius)
4348	sc_x_start = (x_a - srw) * ddx
4349	sc_x_end = (x_a + srw) * ddx
4350	sc_y_start = (y_a - srw) * ddx
4351	sc_y_end = (y_a + srw) * ddx
4352	IF ( sc_x_start < nxlg ) sc_x_start = nxlg
4353	IF ( sc_x_end > nxrg ) sc_x_end = nxrg
4354	IF ( sc_y_start < nysg ) sc_y_start = nysg
4355	IF ( sc_y_end > nyng ) sc_y_end = nyng
4356	!
4357	!-- Find "walls" ( i.e. topography steps (up or down) higher than one
4358	!-- grid box ) that are perpendicular to the agent within the defined
4359	!-- search radius. Such obstacles cannot be passed and a social force
4360	!-- to that effect is applied.
4361	!-- Walls only apply a force perpendicular to the wall to the agent.
4362	!-- There is therefore a search for walls directly right, left, south
4363	!-- and north of the agent. All other walls are ignored.
4364	!--
4365	!-- Check for wall left of current agent
4366	ij_dum = 0
4367	IF ( sc_x_start < ip ) THEN
4368	DO il = ip - 1, sc_x_start, -1
4369	!
4370	!-- Going left from the agent, check for a right wall
4371	IF ( BTEST( obstacle_flags(jp,il), 2 ) ) THEN
4372	!
4373	!-- obstacle found in grid box il, wall at right side
4374	x_wall = (il+1)*dx
4375	!
4376	!-- Calculate force of found wall on agent
4377	CALL mas_timestep_wall_corner_force( x_a, x_wall, y_a, &
4378	y_a )
4379	!
4380	!-- calculate new x starting index for later scan for corners
4381	ij_dum = il + 1
4382	EXIT
4383	ENDIF
4384	ENDDO
4385	ENDIF
4386	IF ( ij_dum /= 0 ) sc_x_start = ij_dum
4387
4388	!
4389	!-- Check for wall right of current agent
4390	ij_dum = 0
4391	IF ( sc_x_end > ip ) THEN
4392	DO il = ip + 1, sc_x_end
4393	!
4394	!-- Going right from the agent, check for a left wall
4395	IF ( BTEST( obstacle_flags(jp,il), 6 ) ) THEN
4396	!
4397	!-- obstacle found in grid box il, wall at left side
4398	x_wall = il*dx
4399	!
4400	!-- Calculate force of found wall on agent
4401	CALL mas_timestep_wall_corner_force( x_a, x_wall, y_a, &
4402	y_a )
4403	!
4404	!-- calculate new x end index for later scan for corners
4405	ij_dum = il - 1
4406	EXIT
4407	ENDIF
4408	ENDDO
4409	ENDIF
4410	IF ( ij_dum /= 0 ) sc_x_end = ij_dum
4411
4412	!
4413	!-- Check for wall south of current agent
4414	ij_dum = 0
4415	IF ( sc_y_start < jp ) THEN
4416	DO jl = jp - 1, sc_y_start, -1
4417	!
4418	!-- Going south from the agent, check for a north wall
4419	IF ( BTEST( obstacle_flags(jl,ip), 0 ) ) THEN
4420	!
4421	!-- obstacle found in grid box jl, wall at left side
4422	y_wall = (jl+1)*dy
4423
4424	CALL mas_timestep_wall_corner_force( x_a, x_a, y_a, &
4425	y_wall )
4426	!
4427	!-- calculate new y starting index for later scan for corners
4428	ij_dum = jl + 1
4429	EXIT
4430	ENDIF
4431	ENDDO
4432	ENDIF
4433	IF ( ij_dum /= 0 ) sc_y_start = ij_dum
4434
4435	!
4436	!-- Check for wall north of current agent
4437	ij_dum = 0
4438	IF ( sc_y_end > jp ) THEN
4439	DO jl = jp + 1, sc_y_end
4440	!
4441	!-- Going north from the agent, check for a south wall
4442	IF ( BTEST( obstacle_flags(jl,ip), 4 ) ) THEN
4443	!
4444	!-- obstacle found in grid box jl, wall at left side
4445	y_wall = jl*dy
4446
4447	CALL mas_timestep_wall_corner_force( x_a, x_a, y_a, &
4448	y_wall )
4449	!
4450	!-- calculate new y end index for later scan for corners
4451	ij_dum = jl - 1
4452	ENDIF
4453	ENDDO
4454	ENDIF
4455	IF ( ij_dum /= 0 ) sc_y_end = ij_dum
4456
4457	!
4458	!-- Scan for corners surrounding current agent.
4459	!-- Only gridcells that are closer than the closest wall in each
4460	!-- direction (n,s,r,l) are considered in the search since those
4461	!-- further away would have a significantly smaller resulting force
4462	!-- than the closer wall.
4463	DO il = sc_x_start, sc_x_end
4464	DO jl = sc_y_start, sc_y_end
4465	IF ( il == ip .OR. jl == jp ) CYCLE
4466	!
4467	!-- corners left of agent
4468	IF ( il < ip ) THEN
4469	!
4470	!-- south left quadrant: look for north right corner
4471	IF ( jl < jp ) THEN
4472	IF ( BTEST( obstacle_flags(jl,il), 1 ) ) THEN
4473	!
4474	!-- calculate coordinates of the found corner
4475	x_wall = (il+1)*dx
4476	y_wall = (jl+1)*dy
4477
4478	CALL mas_timestep_wall_corner_force( x_a, x_wall, &
4479	y_a, y_wall )
4480
4481	ENDIF
4482	!
4483	!-- north left quadrant: look for south right corner
4484	ELSEIF ( jl > jp ) THEN
4485	IF ( BTEST( obstacle_flags(jl,il), 3 ) ) THEN
4486	!
4487	!-- calculate coordinates of the corner of said gridcell
4488	!-- that is closest to the current agent
4489	x_wall = (il+1)*dx
4490	y_wall = jl*dy
4491
4492	CALL mas_timestep_wall_corner_force( x_a, x_wall, &
4493	y_a, y_wall )
4494
4495	ENDIF
4496	ENDIF
4497	ELSEIF ( il > ip ) THEN
4498	!
4499	!-- south right quadrant: look for north left corner
4500	IF ( jl < jp ) THEN
4501	IF ( BTEST( obstacle_flags(jl,il), 7 ) ) THEN
4502	!
4503	!-- calculate coordinates of the corner of said gridcell
4504	!-- that is closest to the current agent
4505	x_wall = il*dx
4506	y_wall = (jl+1)*dy
4507
4508	CALL mas_timestep_wall_corner_force( x_a, x_wall, &
4509	y_a, y_wall )
4510
4511	ENDIF
4512	!
4513	!-- north right quadrant: look for south left corner
4514	ELSEIF ( jl > jp ) THEN
4515	IF ( BTEST( obstacle_flags(jl,il), 5 ) ) THEN
4516	!
4517	!-- calculate coordinates of the corner of said gridcell
4518	!-- that is closest to the current agent
4519	x_wall = il*dx
4520	y_wall = jl*dy
4521
4522	CALL mas_timestep_wall_corner_force( x_a, x_wall, &
4523	y_a, y_wall )
4524
4525	ENDIF
4526	ENDIF
4527	ENDIF
4528	ENDDO
4529	ENDDO
4530
4531	CASE DEFAULT
4532
4533	END SELECT
4534
4535	END SUBROUTINE mas_timestep_social_forces
4536
4537	!------------------------------------------------------------------------------!
4538	! Description:
4539	! ------------
4540	!> Given a distance to the current agent, calculates the force a found corner
4541	!> or wall exerts on that agent
4542	!------------------------------------------------------------------------------!
4543	SUBROUTINE mas_timestep_wall_corner_force( xa, xw, ya, yw )
4544
4545	IMPLICIT NONE
4546
4547	REAL(wp) :: dist_l !< distance to obstacle
4548	REAL(wp) :: force_d_x !< increment of social force, x-direction
4549	REAL(wp) :: force_d_y !< increment of social force, x-direction
4550	REAL(wp) :: xa !< x-position of agent
4551	REAL(wp) :: xw !< x-position of wall
4552	REAL(wp) :: ya !< x-position of agent
4553	REAL(wp) :: yw !< y-position of wall
4554
4555	force_d_x = 0.0_wp
4556	force_d_y = 0.0_wp
4557	!
4558	!-- calculate coordinates of corner relative to agent
4559	!-- postion and distance between corner and agent
4560	xw = xa - xw
4561	yw = ya - yw
4562	dist_l = SQRT( (xw)2 + (yw)2 )
4563	!
4564	!-- calculate x and y component of repulsive force
4565	!-- induced by previously found corner
4566	IF ( dist_l > 0 ) THEN
4567	force_d_x = repuls_wall * d_sigma_rep_wall &
4568	* EXP( -dist_l * d_sigma_rep_wall ) &
4569	* xw / (dist_l)
4570	force_d_y = repuls_wall * d_sigma_rep_wall &
4571	* EXP( -dist_l * d_sigma_rep_wall ) &
4572	* yw / (dist_l)
4573	ENDIF
4574
4575	! !-- forces that are located outside of a sight radius of
4576	! !-- 200 degrees (-> COS(100./180.pi) = COS(.555pi)) of
4577	! !-- current agent are considered to have an effect of 50%
4578	! IF ( force_d_x * agents(nl)%speed_e_x + &
4579	! force_d_y * agents(nl)%speed_e_y < &
4580	! SQRT(force_d_x2 + force_d_y2) * &
4581	! COS( .55555555 * 3.1415 ) ) &
4582	! THEN
4583	! force_d_x = force_d_x * .5_wp
4584	! force_d_y = force_d_y * .5_wp
4585	! ENDIF
4586
4587	!
4588	!-- add force increment to total force of current agent
4589	force_x = force_x + force_d_x
4590	force_y = force_y + force_d_y
4591
4592	END SUBROUTINE mas_timestep_wall_corner_force
4593
4594	!
4595	!-- Calculates distance of point P to edge (A,B). If A = B, calculates
4596	!-- point-to-point distance from A/B to P
4597	FUNCTION dist_point_to_edge ( a_x, a_y, b_x, b_y, p_x, p_y )
4598
4599	IMPLICIT NONE
4600
4601	REAL(wp) :: ab_x !< x-coordinate of vector from A to B
4602	REAL(wp) :: ab_y !< y-coordinate of vector from A to B
4603	REAL(wp) :: ab_d !< inverse length of vector from A to B
4604	REAL(wp) :: ab_u_x !< x-coordinate of vector with direction of ab and length 1
4605	REAL(wp) :: ab_u_y !< y-coordinate of vector with direction of ab and length 1
4606	REAL(wp) :: ba_x !< x-coordinate of vector from B to A
4607	REAL(wp) :: ba_y !< y-coordinate of vector from B to A
4608	REAL(wp) :: ap_x !< x-coordinate of vector from A to P
4609	REAL(wp) :: ap_y !< y-coordinate of vector from A to P
4610	REAL(wp) :: bp_x !< x-coordinate of vector from B to P
4611	REAL(wp) :: bp_y !< y-coordinate of vector from B to P
4612	REAL(wp) :: a_x !< x-coordinate of point A of edge
4613	REAL(wp) :: a_y !< y-coordinate of point A of edge
4614	REAL(wp) :: b_x !< x-coordinate of point B of edge
4615	REAL(wp) :: b_y !< y-coordinate of point B of edge
4616	REAL(wp) :: p_x !< x-coordinate of point P
4617	REAL(wp) :: p_y !< y-coordinate of point P
4618	REAL(wp) :: dist_x !< x-coordinate of point P
4619	REAL(wp) :: dist_y !< y-coordinate of point P
4620	REAL(wp) :: dist_point_to_edge !< y-coordinate of point P
4621
4622	ab_x = - a_x + b_x
4623	ab_y = - a_y + b_y
4624	ba_x = - b_x + a_x
4625	ba_y = - b_y + a_y
4626	ap_x = - a_x + p_x
4627	ap_y = - a_y + p_y
4628	bp_x = - b_x + p_x
4629	bp_y = - b_y + p_y
4630
4631	IF ( ab_x * ap_x + ab_y * ap_y <= 0. ) THEN
4632	dist_point_to_edge = SQRT((a_x - p_x)2 + (a_y - p_y)2)
4633	ELSEIF ( ba_x * bp_x + ba_y * bp_y <= 0. ) THEN
4634	dist_point_to_edge = SQRT((b_x - p_x)2 + (b_y - p_y)2)
4635	ELSE
4636	ab_d = 1./SQRT((ab_x)2+(ab_y)2)
4637	ab_u_x = ab_x*ab_d
4638	ab_u_y = ab_y*ab_d
4639	dist_x = ap_x - (ap_xab_u_x+ap_yab_u_y)*ab_u_x
4640	dist_y = ap_y - (ap_xab_u_x+ap_yab_u_y)*ab_u_y
4641	dist_point_to_edge = SQRT( dist_x2 + dist_y2 )
4642	ENDIF
4643
4644	END FUNCTION dist_point_to_edge
4645
4646	!
4647	!-- Returns the heuristic between points A and B (currently the straight
4648	!-- distance)
4649	FUNCTION heuristic ( ax, ay, bx, by )
4650
4651	IMPLICIT NONE
4652
4653	REAL(wp) :: ax !< x-coordinate of point A
4654	REAL(wp) :: ay !< y-coordinate of point A
4655	REAL(wp) :: bx !< x-coordinate of point B
4656	REAL(wp) :: by !< y-coordinate of point B
4657	REAL(wp) :: heuristic !< return value
4658
4659	heuristic = SQRT(( ax - bx )2 + ( ay - by )2)
4660
4661	END FUNCTION heuristic
4662
4663	!
4664	!-- Calculates if point P is left of the infinite
4665	!-- line that contains A and B (direction: A to B)
4666	!-- Concept: 2D rotation of two vectors
4667	FUNCTION is_left ( ax, ay, bx, by, px, py )
4668
4669	IMPLICIT NONE
4670
4671	LOGICAL :: is_left !< return value; TRUE if P is left of AB
4672
4673	REAL(wp) :: ax !< x-coordinate of point A
4674	REAL(wp) :: ay !< y-coordinate of point A
4675	REAL(wp) :: bx !< x-coordinate of point B
4676	REAL(wp) :: by !< y-coordinate of point B
4677	REAL(wp) :: px !< x-coordinate of point P
4678	REAL(wp) :: py !< y-coordinate of point P
4679
4680	is_left = (bx-ax)(py-ay)-(px-ax)(by-ay) > 0
4681	IF ( (ABS(ax-px) < .001 .AND. ABS(ay-py) < .001) .OR. &
4682	(ABS(bx-px) < .001 .AND. ABS(by-py) < .001) ) &
4683	THEN
4684	is_left = .FALSE.
4685	ENDIF
4686
4687	RETURN
4688
4689	END FUNCTION is_left
4690
4691	!
4692	!-- Calculates if point P is right of the infinite
4693	!-- line that contains A and B (direction: A to B)
4694	!-- Concept: 2D rotation of two vectors
4695	FUNCTION is_right ( ax, ay, bx, by, px, py )
4696
4697	IMPLICIT NONE
4698
4699	LOGICAL :: is_right !< return value; TRUE if P is right of AB
4700
4701	REAL(wp), INTENT(IN) :: ax !< x-coordinate of point A
4702	REAL(wp), INTENT(IN) :: ay !< y-coordinate of point A
4703	REAL(wp), INTENT(IN) :: bx !< x-coordinate of point B
4704	REAL(wp), INTENT(IN) :: by !< y-coordinate of point B
4705	REAL(wp), INTENT(IN) :: px !< x-coordinate of point P
4706	REAL(wp), INTENT(IN) :: py !< y-coordinate of point P
4707
4708	is_right = (bx-ax)(py-ay)-(px-ax)(by-ay) < 0
4709	IF ( (ABS(ax-px) < .001 .AND. ABS(ay-py) < .001) .OR. &
4710	(ABS(bx-px) < .001 .AND. ABS(by-py) < .001) ) &
4711	THEN
4712	is_right = .FALSE.
4713	ENDIF
4714
4715	RETURN
4716
4717	END FUNCTION is_right
4718
4719	!
4720	!-- Returns true if the line segments AB and PQ share an intersection
4721	FUNCTION intersect ( ax, ay, bx, by, px, py, qx, qy )
4722
4723	IMPLICIT NONE
4724
4725	LOGICAL :: intersect !< return value; TRUE if intersection was found
4726	LOGICAL :: la !< T if a is left of PQ
4727	LOGICAL :: lb !< T if b is left of PQ
4728	LOGICAL :: lp !< T if p is left of AB
4729	LOGICAL :: lq !< T if q is left of AB
4730	LOGICAL :: poss !< flag that indicates if an intersection is still possible
4731	LOGICAL :: ra !< T if a is right of PQ
4732	LOGICAL :: rb !< T if b is right of PQ
4733	LOGICAL :: rp !< T if p is right of AB
4734	LOGICAL :: rq !< T if q is right of AB
4735
4736	REAL(wp) :: ax !< x-coordinate of point A
4737	REAL(wp) :: ay !< y-coordinate of point A
4738	REAL(wp) :: bx !< x-coordinate of point B
4739	REAL(wp) :: by !< y-coordinate of point B
4740	REAL(wp) :: px !< x-coordinate of point P
4741	REAL(wp) :: py !< y-coordinate of point P
4742	REAL(wp) :: qx !< x-coordinate of point Q
4743	REAL(wp) :: qy !< y-coordinate of point Q
4744
4745	intersect = .FALSE.
4746	poss = .FALSE.
4747	!
4748	!-- Intersection is possible only if P and Q are on opposing sides of AB
4749	lp = is_left(ax,ay,bx,by,px,py)
4750	rq = is_right(ax,ay,bx,by,qx,qy)
4751	IF ( lp .AND. rq ) poss = .TRUE.
4752	IF ( .NOT. poss ) THEN
4753	lq = is_left(ax,ay,bx,by,qx,qy)
4754	rp = is_right(ax,ay,bx,by,px,py)
4755	IF ( lq .AND. rp ) poss = .TRUE.
4756	ENDIF
4757	!
4758	!-- Intersection occurs only if above test (poss) was true AND
4759	!-- A and B are on opposing sides of PQ
4760	IF ( poss ) THEN
4761	la = is_left(px,py,qx,qy,ax,ay)
4762	rb = is_right(px,py,qx,qy,bx,by)
4763	IF ( la .AND. rb ) intersect = .TRUE.
4764	IF ( .NOT. intersect ) THEN
4765	lb = is_left(px,py,qx,qy,bx,by)
4766	ra = is_right(px,py,qx,qy,ax,ay)
4767	IF ( lb .AND. ra ) intersect = .TRUE.
4768	ENDIF
4769	ENDIF
4770
4771	RETURN
4772
4773	END FUNCTION intersect
4774
4775	!
4776	!-- Gives a nuber randomly distributed around an average
4777	FUNCTION random_normal ( avg, variation )
4778
4779	IMPLICIT NONE
4780
4781	REAL(wp) :: avg !< x-coordinate of vector from A to B
4782	REAL(wp) :: variation !< y-coordinate of vector from A to B
4783	REAL(wp) :: random_normal !< y-coordinate of vector from A to B
4784
4785	REAL(wp), DIMENSION(12) :: random_arr !< inverse length of vector from A to B
4786
4787	CALL RANDOM_NUMBER(random_arr)
4788	random_normal = avg + variation*(SUM(random_arr)-6.)
4789
4790	END FUNCTION random_normal
4791
4792
4793	END MODULE multi_agent_system_mod

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