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source: palm/trunk/SOURCE/multi_agent_system_mod.f90 @ 3205

Last change on this file since 3205 was 3201, checked in by sward, 6 years ago
Added missing preprocessor directive, corrected default value for restarts
Property svn:keywords set to `Id`
File size: 190.5 KB

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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 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: multi_agent_system_mod.f90 3201 2018-08-20 11:45:01Z raasch $
27	! Bugfix, missing pre-processor directive. Set default
28	! read_agents_from_restartfile = .FALSE. restarts not yet implemented.
29	!
30	! 3198 2018-08-15 09:23:10Z sward
31	! Now using time_since_reference_point; moved multi_agent_system_start and
32	! multi_agent_system_end to control_parameters; renamed NAMELIST agents_par to
33	! agent_parameters
34	!
35	! 3187 2018-07-31 10:32:34Z sward
36	! Reworked agent pathfinding to avoid collisions with walls
37	!
38	! 3165 2018-07-24 13:12:42Z sward
39	! Added agent ID output
40	!
41	! 3160 2018-07-20 11:52:56Z sward
42	! Changed C_SIZEOF to STORAGE_SIZE
43	!
44	! 3159 2018-07-20 11:20:01Z sward
45	! Initial revision
46	!
47	!
48	!
49	! Authors:
50	! --------
51	! @author sward
52	!
53	!
54	! Description:
55	! ------------
56	!> Multi Agent System for the simulation of pedestrian movement in urban
57	!> environments
58	!------------------------------------------------------------------------------!
59	MODULE multi_agent_system_mod
60
61	USE, INTRINSIC :: ISO_C_BINDING
62
63	USE constants, &
64	ONLY: pi
65
66	USE control_parameters, &
67	ONLY: dt_3d, message_string, time_since_reference_point, dt_write_agent_data
68
69	USE cpulog, &
70	ONLY: cpu_log, log_point, log_point_s
71
72	USE grid_variables, &
73	ONLY: ddx, ddy, dx, dy
74
75	USE indices, &
76	ONLY: nx, nxl, nxlg, nxr, nxrg, ny, nyn, nyng, nys, nysg, nzb, &
77	wall_flags_0
78
79	USE random_function_mod, &
80	ONLY: random_function
81
82	USE kinds
83
84	USE pegrid
85
86	CHARACTER(LEN=15) :: bc_mas_lr = 'absorb' !< left/right boundary condition
87	CHARACTER(LEN=15) :: bc_mas_ns = 'absorb' !< north/south boundary condition
88
89	INTEGER(iwp) :: deleted_agents = 0 !< number of deleted agents per time step
90	INTEGER(iwp) :: heap_count !< number of items in binary heap (for pathfinding)
91	INTEGER(iwp) :: ibc_mas_lr !< agent left/right boundary condition dummy
92	INTEGER(iwp) :: ibc_mas_ns !< agent north/south boundary condition dummy
93	INTEGER(iwp) :: ind_pm10 = -9 !< chemical species index of PM10
94	INTEGER(iwp) :: ind_pm25 = -9 !< chemical species index of PM2.5
95	INTEGER(iwp) :: iran_agent = -1234567 !< number for random generator
96	INTEGER(iwp) :: min_nr_agent = 2 !< namelist parameter (see documentation)
97	INTEGER(iwp) :: ghla_count_recv !< number of agents in left ghost layer
98	INTEGER(iwp) :: ghna_count_recv !< number of agents in north ghost layer
99	INTEGER(iwp) :: ghra_count_recv !< number of agents in right ghost layer
100	INTEGER(iwp) :: ghsa_count_recv !< number of agents in south ghost layer
101	INTEGER(iwp) :: nr_move_north !< number of agts to move north during exchange_horiz
102	INTEGER(iwp) :: nr_move_south !< number of agts to move south during exchange_horiz
103	INTEGER(iwp) :: number_of_agents = 0 !< number of agents for each grid box (3d array is saved on agt_count)
104	INTEGER(iwp) :: number_of_agent_groups = 1 !< namelist parameter (see documentation)
105	INTEGER(iwp) :: sort_count_mas = 0 !< counter for sorting agents
106	INTEGER(iwp) :: agt_path_size = 15 !< size of agent path array
107	INTEGER(iwp) :: step_dealloc_mas = 100 !< namelist parameter (see documentation)
108	INTEGER(iwp) :: total_number_of_agents !< total number of agents in the whole model domain
109
110	INTEGER(iwp), PARAMETER :: NR_2_direction_move = 10000 !< parameter for agent exchange
111	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !< phase parameter
112	INTEGER(iwp), PARAMETER :: PHASE_RELEASE = 2 !< phase parameter
113
114	INTEGER(iwp), PARAMETER :: max_number_of_agent_groups = 100 !< maximum allowed number of agent groups
115
116	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: agt_count !< 3d array of number of agents of every grid box
117	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: s_measure_height !< k-index(s-grid) for measurement
118	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: top_top_s !< k-index of first s-gridpoint above topography
119	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: top_top_w !< k-index of first v-gridpoint above topography
120	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: obstacle_flags !< flags to identify corners and edges of topography that cannot be crossed by agents
121
122	LOGICAL :: deallocate_memory_mas = .TRUE. !< namelist parameter (see documentation)
123	LOGICAL :: dt_3d_reached_mas !< flag: agent timestep has reached model timestep
124	LOGICAL :: dt_3d_reached_l_mas !< flag: agent timestep has reached model timestep
125	LOGICAL :: agents_active = .FALSE. !< flag for agent system
126	LOGICAL :: random_start_position_agents = .TRUE. !< namelist parameter (see documentation)
127	LOGICAL :: read_agents_from_restartfile = .FALSE. !< namelist parameter (see documentation)
128	LOGICAL :: agent_own_timestep = .FALSE. !< namelist parameter (see documentation)
129
130	LOGICAL, DIMENSION(max_number_of_agent_groups) :: a_rand_target = .FALSE. !< namelist parameter (see documentation)
131
132	REAL(wp) :: agent_maximum_age = 9999999.9_wp !< namelist parameter (see documentation)
133	REAL(wp) :: alloc_factor_mas = 20.0_wp !< namelist parameter (see documentation)
134	REAL(wp) :: coll_t_0 = 3. !< namelist parameter (see documentation)
135	REAL(wp) :: corner_gate_start = 0.5_wp !< namelist parameter (see documentation)
136	REAL(wp) :: corner_gate_width = 1.0_wp !< namelist parameter (see documentation)
137	REAL(wp) :: d_sigma_rep_agent !< inverse of sigma_rep_agent
138	REAL(wp) :: d_sigma_rep_wall !< inverse of sigma_rep_wall
139	REAL(wp) :: d_tau_accel_agent !< inverse of tau_accel_agent
140	REAL(wp) :: desired_speed = 1.2_wp !< namelist parameter (see documentation)
141	REAL(wp) :: des_sp_sig = .2_wp !< namelist parameter (see documentation)
142	REAL(wp) :: dist_target_reached = 2.0_wp !< distance at which target counts as reached
143	REAL(wp) :: dist_to_int_target = .25_wp !< namelist parameter (see documentation)
144	REAL(wp) :: dt_agent = 0.02_wp !< namelist parameter (see documentation)
145	REAL(wp) :: dt_arel = 9999999.9_wp !< namelist parameter (see documentation)
146	REAL(wp) :: end_time_arel = 9999999.9_wp !< namelist parameter (see documentation)
147	REAL(wp) :: force_x !< dummy value for force on current agent in x-direction
148	REAL(wp) :: force_y !< dummy value for force on current agent in y-direction
149	REAL(wp) :: max_dist_from_path = 0.25_wp !< distance from current path at which a new path is calculated
150	REAL(wp) :: radius_agent = .25_wp !< namelist parameter (see documentation)
151	REAL(wp) :: repuls_agent = 1.5_wp !< namelist parameter (see documentation)
152	REAL(wp) :: repuls_wall = 7.0_wp !< namelist parameter (see documentation)
153	REAL(wp) :: scan_radius_agent = 3.0_wp !< namelist parameter (see documentation)
154	REAL(wp) :: scan_radius_wall = 2.0_wp !< namelist parameter (see documentation)
155	REAL(wp) :: sigma_rep_agent = 0.3_wp !< namelist parameter (see documentation)
156	REAL(wp) :: sigma_rep_wall = 0.1_wp !< namelist parameter (see documentation)
157	REAL(wp) :: tau_accel_agent = 0.5_wp !< namelist parameter (see documentation)
158	REAL(wp) :: time_arel = 0.0_wp !< time for agent release
159	REAL(wp) :: time_write_agent_data = 0.0_wp !< write agent data at current time on file
160	REAL(wp) :: v_max_agent = 1.3_wp !< namelist parameter (see documentation)
161
162	REAL(wp), DIMENSION(:), ALLOCATABLE :: dummy_path_x !< dummy path (x-coordinate)
163	REAL(wp), DIMENSION(:), ALLOCATABLE :: dummy_path_y !< dummy path (y-coordinate)
164
165	REAL(wp), DIMENSION(max_number_of_agent_groups) :: adx = 9999999.9_wp !< namelist parameter (see documentation)
166	REAL(wp), DIMENSION(max_number_of_agent_groups) :: ady = 9999999.9_wp !< namelist parameter (see documentation)
167	REAL(wp), DIMENSION(max_number_of_agent_groups) :: asl = 9999999.9_wp !< namelist parameter (see documentation)
168	REAL(wp), DIMENSION(max_number_of_agent_groups) :: asn = 9999999.9_wp !< namelist parameter (see documentation)
169	REAL(wp), DIMENSION(max_number_of_agent_groups) :: asr = 9999999.9_wp !< namelist parameter (see documentation)
170	REAL(wp), DIMENSION(max_number_of_agent_groups) :: ass = 9999999.9_wp !< namelist parameter (see documentation)
171	REAL(wp), DIMENSION(max_number_of_agent_groups) :: at_x = 9999999.9_wp !< namelist parameter (see documentation)
172	REAL(wp), DIMENSION(max_number_of_agent_groups) :: at_y = 9999999.9_wp !< namelist parameter (see documentation)
173	!
174	!-- Type for the definition of an agent
175	TYPE agent_type
176	INTEGER(iwp) :: block_nr !< number for sorting
177	INTEGER(iwp) :: group !< number of agent group
178	INTEGER(idp) :: id !< particle ID (64 bit integer)
179	INTEGER(iwp) :: path_counter !< current target along path (path_x/y)
180	LOGICAL :: agent_mask !< if this parameter is set to false the agent will be deleted
181	REAL(wp) :: age !< age of agent
182	REAL(wp) :: age_m !< age of agent
183	REAL(wp) :: dt_sum !< sum of agents subtimesteps
184	REAL(wp) :: clo !< clothing index
185	REAL(wp) :: energy_storage !< energy stored by agent
186	REAL(wp) :: force_x !< force term x-direction
187	REAL(wp) :: force_y !< force term y-direction
188	REAL(wp) :: origin_x !< origin x-position of agent
189	REAL(wp) :: origin_y !< origin y-position of agent
190	REAL(wp) :: pm10 !< PM10 concentration at agent position
191	REAL(wp) :: pm25 !< PM25 concentration at agent position
192	REAL(wp) :: speed_abs !< absolute value of agent speed
193	REAL(wp) :: speed_e_x !< normalized speed of agent in x
194	REAL(wp) :: speed_e_y !< normalized speed of agent in y
195	REAL(wp) :: speed_des !< agent's desired speed
196	REAL(wp) :: speed_x !< speed of agent in x
197	REAL(wp) :: speed_y !< speed of agent in y
198	REAL(wp) :: thermal_index !< the dynamic thermal index
199	REAL(wp) :: windspeed !< absolute value of windspeed at agent position
200	REAL(wp) :: x !< x-position
201	REAL(wp) :: y !< y-position
202	REAL(wp) :: t !< temperature
203	REAL(wp) :: t_x !< x-position
204	REAL(wp) :: t_y !< y-position
205	REAL(wp), DIMENSION(0:15) :: path_x !< agent path to target (x)
206	REAL(wp), DIMENSION(0:15) :: path_y !< agent path to target (y)
207	END TYPE agent_type
208
209	TYPE(agent_type), DIMENSION(:), POINTER :: agents !< Agent array for this grid cell
210	TYPE(agent_type) :: zero_agent !< zero agent to avoid weird thing
211	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: move_also_north !< for agent exchange between PEs
212	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: move_also_south !< for agent exchange between PEs
213	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_l !< ghost layer left of pe domain
214	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_n !< ghost layer north of pe domain
215	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_r !< ghost layer right of pe domain
216	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: agt_gh_s !< ghost layer south of pe domain
217	!
218	!-- Type for 2D grid on which agents are stored
219	TYPE grid_agent_def
220	INTEGER(iwp), DIMENSION(0:3) :: start_index !< start agent index for current block
221	INTEGER(iwp), DIMENSION(0:3) :: end_index !< end agent index for current block
222	INTEGER(iwp) :: id_counter !< agent id counter (removeable?)
223	LOGICAL :: time_loop_done !< timestep loop for agent advection
224	TYPE(agent_type), POINTER, DIMENSION(:) :: agents !< Particle array for this grid cell
225	END TYPE grid_agent_def
226
227	TYPE(grid_agent_def), DIMENSION(:,:), ALLOCATABLE, TARGET :: grid_agents !< 2D grid on which agents are stored
228	!
229	!-- Item in a priority queue (binary heap)
230	TYPE heap_item
231	INTEGER(iwp) :: mesh_id !< id of the submitted mesh point
232	REAL(wp) :: priority !< priority of the mesh point (= distance so far + heuristic to goal)
233	END TYPE heap_item
234
235	TYPE(heap_item), DIMENSION(:), ALLOCATABLE :: queue !< priority queue realized as binary heap
236	!
237	!-- Type for mesh point in visibility graph
238	TYPE mesh_point
239	INTEGER(iwp) :: polygon_id !< Polygon the point belongs to
240	INTEGER(iwp) :: vertex_id !< Vertex in the polygon
241	INTEGER(iwp) :: noc !< number of connections
242	INTEGER(iwp) :: origin_id !< ID of previous mesh point on path (A*)
243	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: connected_vertices !< Index of connected vertices
244	REAL(wp) :: cost_so_far !< Cost to reach this mesh point (A*)
245	REAL(wp) :: x !< x-coordinate
246	REAL(wp) :: y !< y-coordinate
247	REAL(wp) :: x_s !< corner shifted outward from building by 1m (x)
248	REAL(wp) :: y_s !< corner shifted outward from building by 1m (y)
249	REAL(wp), DIMENSION(:), ALLOCATABLE :: distance_to_vertex !< Distance to each vertex
250	END TYPE mesh_point
251
252	TYPE(mesh_point), DIMENSION(:), ALLOCATABLE :: mesh !< navigation mesh
253	TYPE(mesh_point), DIMENSION(:), ALLOCATABLE :: tmp_mesh !< temporary navigation mesh
254	!
255	!-- Vertex of a polygon
256	TYPE vertex_type
257	LOGICAL :: delete !< Flag to mark vertex for deletion
258	REAL(wp) :: x !< x-coordinate
259	REAL(wp) :: y !< y-coordinate
260	END TYPE vertex_type
261	!
262	!-- Polygon containing a number of vertices
263	TYPE polygon_type
264	INTEGER(iwp) :: nov !< Number of vertices in this polygon
265	TYPE(vertex_type), DIMENSION(:), ALLOCATABLE :: vertices !< Array of vertices
266	END TYPE polygon_type
267
268	TYPE(polygon_type), DIMENSION(:), ALLOCATABLE :: polygons !< Building data in polygon form
269
270	SAVE
271
272	PRIVATE
273	!
274	!-- Public functions
275	PUBLIC mas_init, mas_parin, multi_agent_system
276
277	!
278	!-- Public parameters, constants and initial values
279	PUBLIC agents_active
280
281	INTERFACE mas_parin
282	MODULE PROCEDURE mas_parin
283	END INTERFACE mas_parin
284
285	INTERFACE mas_init
286	MODULE PROCEDURE mas_init
287	END INTERFACE mas_init
288
289	INTERFACE multi_agent_system
290	MODULE PROCEDURE multi_agent_system
291	END INTERFACE multi_agent_system
292
293	CONTAINS
294
295
296	!------------------------------------------------------------------------------!
297	! Description:
298	! ------------
299	!> Multi Agent System:
300	!> executes a number of agents sub-timesteps until the model timestep is reached.
301	!> The agent timestep is usually smaller than the model timestep
302	!------------------------------------------------------------------------------!
303	SUBROUTINE multi_agent_system
304
305	! USE htcm_mod, &
306	! ONLY: htcm_dynamic
307
308	IMPLICIT NONE
309
310	INTEGER(iwp) :: i !< counter
311	INTEGER(iwp) :: ie !< counter
312	INTEGER(iwp) :: is !< counter
313	INTEGER(iwp) :: j !< counter
314	INTEGER(iwp) :: je !< counter
315	INTEGER(iwp) :: js !< counter
316	INTEGER(iwp), SAVE :: mas_count = 0 !< counts the mas-calls
317
318	LOGICAL :: first_loop_stride !< flag for first loop stride of agent sub-timesteps
319	LOGICAL :: first_call = .TRUE. !< first call of mas flag for output
320
321	CALL cpu_log( log_point(9), 'mas', 'start' )
322	!
323	!-- Initialize variables for the next (sub-) timestep, i.e., for marking
324	!-- those agents to be deleted after the timestep
325	deleted_agents = 0
326	!
327	!-- If necessary, release new set of agents
328	IF ( time_arel >= dt_arel .AND. end_time_arel > time_since_reference_point ) THEN
329
330	CALL mas_create_agent(PHASE_RELEASE)
331	!
332	!-- The MOD function allows for changes in the output interval with
333	!-- restart runs.
334	time_arel = MOD( time_arel, MAX( dt_arel, dt_3d ) )
335
336	ENDIF
337
338	first_loop_stride = .TRUE.
339	grid_agents(:,:)%time_loop_done = .TRUE.
340	!
341	!-- Set timestep variable
342	IF ( .NOT. agent_own_timestep ) dt_agent = dt_3d
343	!
344	!-- Timestep loop for agent transport.
345	!-- This loop has to be repeated until the transport time of every agent
346	!-- (within the total domain!) has reached the LES timestep (dt_3d).
347	!-- Timestep scheme is Euler-forward
348	DO
349	!
350	!-- Write agent data at current time on file.
351	time_write_agent_data = time_write_agent_data + dt_agent
352	IF ( time_write_agent_data >= dt_write_agent_data ) THEN
353	#if defined( __netcdf )
354	IF ( first_loop_stride ) CALL mas_get_prognostic_quantities
355	CALL mas_data_output_agents ( first_call )
356	#else
357	WRITE( message_string, * ) 'NetCDF is needed for agent output. ', &
358	'Set __netcdf in compiler options'
359	CALL message( 'multi_agent_system', 'PA0071', 1, 2, 0, 6, 0 )
360	#endif
361	IF(first_call) first_call = .FALSE.
362	time_write_agent_data = time_write_agent_data - dt_write_agent_data
363	ENDIF
364	!
365	!-- Start logging
366	CALL cpu_log( log_point_s(9), 'mas_transport', 'start' )
367	CALL cpu_log( log_point_s(9), 'mas_transport', 'pause' )
368	CALL cpu_log( log_point_s(16), 'mas_other_agents', 'start' )
369	CALL cpu_log( log_point_s(16), 'mas_other_agents', 'pause' )
370	!
371	!-- Flag is true by default, will be set to false if an agent has not yet
372	!-- reached the model timestep
373	grid_agents(:,:)%time_loop_done = .TRUE.
374
375	!
376	!-- First part of agent transport:
377	!-- Evaluate social forces for all agents at current positions
378	DO i = nxl, nxr
379	DO j = nys, nyn
380
381	number_of_agents = agt_count(j,i)
382	!
383	!-- If grid cell is empty, cycle
384	IF ( number_of_agents <= 0 ) CYCLE
385
386	agents => grid_agents(j,i)%agents(1:number_of_agents)
387	!
388	!-- Evaluation of social forces
389	CALL mas_timestep_forces_call(i,j)
390
391	ENDDO
392	ENDDO
393	!
394	!-- Second part of agent transport:
395	!-- timestep
396	DO i = nxl, nxr
397	DO j = nys, nyn
398
399	number_of_agents = agt_count(j,i)
400	!
401	!-- If grid cell is empty, flag must be true
402	IF ( number_of_agents <= 0 ) THEN
403	grid_agents(j,i)%time_loop_done = .TRUE.
404	CYCLE
405	ENDIF
406
407	agents => grid_agents(j,i)%agents(1:number_of_agents)
408
409	agents(1:number_of_agents)%agent_mask = .TRUE.
410	!
411	!-- Initialize the variable storing the total time that an agent
412	!-- has advanced within the timestep procedure
413	IF ( first_loop_stride ) THEN
414	agents(1:number_of_agents)%dt_sum = 0.0_wp
415	ENDIF
416	!
417	!-- Initialize the switch used for the loop exit condition checked
418	!-- at the end of this loop. If at least one agent has failed to
419	!-- reach the LES timestep, this switch will be set false in
420	!-- mas_transport.
421	dt_3d_reached_l_mas = .TRUE.
422	!
423	!-- Timestep
424	CALL mas_timestep
425	!
426	!-- Delete agents that have been simulated longer than allowed
427	CALL mas_boundary_conds( 'max_sim_time' )
428	!
429	!-- Delete agents that have reached target area
430	CALL mas_boundary_conds( 'target_area' )
431	!
432	!--- If not all agents of the actual grid cell have reached the
433	!-- LES timestep, this cell has to to another loop iteration. Due to
434	!-- the fact that agents can move into neighboring grid cell,
435	!-- these neighbor cells also have to perform another loop iteration
436	IF ( .NOT. dt_3d_reached_l_mas ) THEN
437	js = MAX(nys,j-1)
438	je = MIN(nyn,j+1)
439	is = MAX(nxl,i-1)
440	ie = MIN(nxr,i+1)
441	grid_agents(js:je,is:ie)%time_loop_done = .FALSE.
442	ENDIF
443
444	ENDDO
445	ENDDO
446
447	!
448	!-- Find out, if all agents on every PE have completed the LES timestep
449	!-- and set the switch corespondingly
450	dt_3d_reached_l_mas = ALL(grid_agents(:,:)%time_loop_done)
451	#if defined( __parallel )
452	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
453	CALL MPI_ALLREDUCE( dt_3d_reached_l_mas, dt_3d_reached_mas, 1, MPI_LOGICAL, &
454	MPI_LAND, comm2d, ierr )
455	#else
456	dt_3d_reached_mas = dt_3d_reached_l_mas
457	#endif
458
459	CALL cpu_log( log_point_s(9), 'mas_transport', 'stop' )
460	CALL cpu_log( log_point_s(16), 'mas_other_agents', 'stop' )
461	!
462	!-- Increment time since last release
463	IF ( dt_3d_reached_mas ) time_arel = time_arel + dt_3d
464
465	!
466	!-- Move Agents local to PE to a different grid cell
467	CALL mas_eh_move_agent
468	!
469	!-- Horizontal boundary conditions including exchange between subdmains
470	CALL mas_eh_exchange_horiz
471	!
472	!-- Pack agents (eliminate those marked for deletion),
473	!-- determine new number of agents
474	CALL mas_ps_sort_in_subboxes
475	!
476	!-- Initialize variables for the next (sub-) timestep, i.e., for marking
477	!-- those agents to be deleted after the timestep
478	deleted_agents = 0
479	!
480	!-- to be included here: call of human thermal comfort mod (and UV exposure)
481	! DO i = nxl, nxr
482	! DO j = nys, nyn
483	!
484	! number_of_agents = agt_count(j,i)
485	! !
486	! !-- If grid cell gets empty, cycle
487	! IF ( number_of_agents <= 0 ) CYCLE
488	!
489	! agents => grid_agents(j,i)%agents(1:number_of_agents)
490	! !
491	! !-- Evaluation of social forces
492	! CALL htcm_dynamic(i,j)
493	!
494	! ENDDO
495	! ENDDO
496
497	IF ( dt_3d_reached_mas ) EXIT
498
499	first_loop_stride = .FALSE.
500	ENDDO ! timestep loop
501
502	!
503	!-- Deallocate unused memory
504	IF ( deallocate_memory_mas .AND. mas_count == step_dealloc_mas ) THEN
505	CALL mas_eh_dealloc_agents_array
506	mas_count = 0
507	ELSEIF ( deallocate_memory_mas ) THEN
508	mas_count = mas_count + 1
509	ENDIF
510
511	CALL cpu_log( log_point(9), 'mas', 'stop' )
512
513	END SUBROUTINE multi_agent_system
514
515	!------------------------------------------------------------------------------!
516	! Description:
517	! ------------
518	!> Calculation of the direction vector from each agent to its current
519	!> intermittent target
520	!------------------------------------------------------------------------------!
521	SUBROUTINE mas_agent_direction
522
523	IMPLICIT NONE
524
525	LOGICAL :: path_flag !< true if new path must be calculated
526
527	INTEGER(iwp) :: n !< loop variable over all agents in a grid box
528	INTEGER(iwp) :: pc !< agent path counter
529	INTEGER(iwp) :: nobo !< agent path counter
530
531	REAL(wp) :: abs_dir !< length of direction vector (for normalization)
532	REAL(wp) :: d_curr_target !< rounding influence expressed as x speed component
533	REAL(wp) :: d_prev_target !< rounding influence expressed as x speed component
534	REAL(wp) :: dir_x !< direction of agent (x)
535	REAL(wp) :: dir_y !< direction of agent (y)
536	REAL(wp) :: dist_round = 3. !< distance at which agents start rounding a corner
537	REAL(wp) :: dtit !< distance to intermittent target
538	REAL(wp) :: round_fac = .2 !< factor for rounding influence
539	REAL(wp) :: speed_round_x !< rounding influence expressed as x speed component
540	REAL(wp) :: speed_round_y !< rounding influence expressed as x speed component
541
542	CALL cpu_log( log_point_s(9), 'mas_transport', 'continue' )
543	!
544	!-- loop over all agents in the current grid box
545	DO n = 1, number_of_agents
546	path_flag = .FALSE.
547	pc = agents(n)%path_counter
548	!
549	!-- If no path was calculated for agent yet, do it
550	IF ( pc >= 999 ) THEN
551	CALL mas_nav_find_path(n)
552	pc = agents(n)%path_counter
553	!
554	!-- Check if new path must be calculated and if so, do it
555	ELSE
556	!
557	!-- Case one: Agent has come close enough to intermittent target.
558	!-- -> chose new int target and calculate rest of path if no
559	!-- new intermittent targets are left
560	dtit = SQRT((agents(n)%x - agents(n)%path_x(pc))**2 &
561	+ (agents(n)%y - agents(n)%path_y(pc))**2)
562	IF ( dtit < dist_to_int_target ) THEN
563	agents(n)%path_counter = agents(n)%path_counter + 1
564	pc = agents(n)%path_counter
565	!
566	!-- Path counter out of scope (each agent can store a maximum of 15
567	!-- intermittent targets on the way to her final target); new path
568	!-- must be calculated
569	IF ( pc >= SIZE(agents(n)%path_x) ) THEN
570	path_flag = .TRUE.
571	ENDIF
572	!
573	!-- Case two: Agent too far from path
574	!-- -> set flag for new path to be calculated
575	ELSEIF ( dist_point_to_edge(agents(n)%path_x(pc-1), &
576	agents(n)%path_y(pc-1), &
577	agents(n)%path_x(pc), &
578	agents(n)%path_y(pc), &
579	agents(n)%x, agents(n)%y) &
580	> max_dist_from_path ) &
581	THEN
582	path_flag = .TRUE.
583	ENDIF
584	!
585	!-- If either of the above two cases was true, calculate new path and
586	!-- reset 0th path point. This point (the last target the agent had)
587	!-- is needed for the agents rounding of corners and the calculation
588	!-- of her deviation from her current path
589	IF ( path_flag ) THEN
590	CALL mas_nav_find_path(n)
591	pc = agents(n)%path_counter
592	ENDIF
593	ENDIF
594	!
595	!-- Normalize direction vector
596	abs_dir = 1.0d-12
597	dir_x = agents(n)%path_x(pc) - agents(n)%x
598	dir_y = agents(n)%path_y(pc) - agents(n)%y
599	abs_dir = SQRT(dir_x2 + dir_y2)+1.0d-12
600	!-- needed later for corner rounding
601	! dir_x = dir_x/abs_dir
602	! dir_y = dir_y/abs_dir
603	! dir_x = dir_x + speed_round_x
604	! dir_y = dir_y + speed_round_y
605	! abs_dir = SQRT(dir_x2 + dir_y2)+1.0d-12
606	agents(n)%speed_e_x = dir_x/abs_dir
607	agents(n)%speed_e_y = dir_y/abs_dir
608	ENDDO
609
610	CALL cpu_log( log_point_s(9), 'mas_transport', 'pause' )
611	!
612	!-- corner rounding; to be added
613	!
614	!-- Calculate direction change due to rounding of corners
615
616	! speed_round_x = 0.
617	! speed_round_y = 0.
618	!
619	! d_curr_target = SQRT( (agents(n)%path_x(pc) - agents(n)%x)**2 + &
620	! (agents(n)%path_y(pc) - agents(n)%y)**2 )
621	! d_prev_target = SQRT( (agents(n)%path_x(pc-1) - agents(n)%x)**2 + &
622	! (agents(n)%path_y(pc-1) - agents(n)%y)**2 )
623	! !
624	! !-- Agent is close to next target and that target is not the final one
625	! IF ( d_curr_target < dist_round .AND. dist_round < &
626	! SQRT( (agents(n)%path_x(pc) - agents(n)%t_x)**2 + &
627	! (agents(n)%path_y(pc) - agents(n)%t_y)**2 ) ) &
628	! THEN
629	! speed_round_x = (agents(n)%path_x(pc+1) - agents(n)%path_x(pc)) / &
630	! ABS( agents(n)%path_x(pc) &
631	! - agents(n)%path_x(pc+1)) * round_fac * &
632	! SIN( pi/dist_round*d_curr_target )
633	! speed_round_y = (agents(n)%path_y(pc+1) - agents(n)%path_y(pc)) / &
634	! ABS( agents(n)%path_y(pc) &
635	! - agents(n)%path_y(pc+1)) * round_fac * &
636	! SIN( pi/dist_round*d_curr_target )
637	! ENDIF
638	!
639	! IF ( d_prev_target < dist_round ) THEN
640	! IF ( agents(n)%path_x(pc) /= agents(n)%path_x(pc+1) ) THEN
641	! speed_round_x = speed_round_x + &
642	! (agents(n)%path_x(pc) - agents(n)%path_x(pc+1)) / &
643	! ABS( agents(n)%path_x(pc) &
644	! - agents(n)%path_x(pc+1)) * round_fac * &
645	! SIN( pi/dist_round*d_prev_target )
646	! ENDIF
647	!
648	! IF ( agents(n)%path_y(pc) /= agents(n)%path_y(pc+1) ) THEN
649	! speed_round_y = speed_round_y + &
650	! (agents(n)%path_y(pc) - agents(n)%path_y(pc+1)) / &
651	! ABS( agents(n)%path_y(pc) &
652	! - agents(n)%path_y(pc+1)) * round_fac * &
653	! SIN( pi/dist_round*d_prev_target )
654	! ENDIF
655
656	! ENDIF
657
658
659	END SUBROUTINE mas_agent_direction
660
661	!------------------------------------------------------------------------------!
662	! Description:
663	! ------------
664	!> Boundary conditions for maximum time, target reached and out of domain
665	!------------------------------------------------------------------------------!
666	SUBROUTINE mas_boundary_conds( location )
667
668	IMPLICIT NONE
669
670	CHARACTER (LEN=*) :: location !< Identifier
671
672	INTEGER(iwp) :: n !< agent number
673	INTEGER(iwp) :: grp !< agent group
674
675	REAL(wp) :: dist_to_target !< distance to target
676
677	IF ( location == 'max_sim_time' ) THEN
678
679	!
680	!-- Delete agents that have been simulated longer than allowed
681	DO n = 1, number_of_agents
682
683	IF ( agents(n)%age > agent_maximum_age .AND. &
684	agents(n)%agent_mask ) &
685	THEN
686	agents(n)%agent_mask = .FALSE.
687	deleted_agents = deleted_agents + 1
688	ENDIF
689
690	ENDDO
691	ENDIF
692
693	IF ( location == 'target_area' ) THEN
694
695	!
696	!-- Delete agents that entered target region
697	DO n = 1, number_of_agents
698	grp = agents(n)%group
699	dist_to_target = SQRT((agents(n)%x-at_x(grp))**2 &
700	+ (agents(n)%y-at_y(grp))**2)
701	IF ( dist_to_target < dist_target_reached ) THEN
702	agents(n)%agent_mask = .FALSE.
703	deleted_agents = deleted_agents + 1
704	ENDIF
705
706	ENDDO
707	ENDIF
708
709	END SUBROUTINE mas_boundary_conds
710
711	!------------------------------------------------------------------------------!
712	! Description:
713	! ------------
714	!> Release new agents at their respective sources
715	!------------------------------------------------------------------------------!
716	SUBROUTINE mas_create_agent (phase)
717
718	IMPLICIT NONE
719
720	INTEGER(iwp) :: alloc_size !< relative increase of allocated memory for agents
721	INTEGER(iwp) :: i !< loop variable ( agent groups )
722	INTEGER(iwp) :: ip !< index variable along x
723	INTEGER(iwp) :: j !< loop variable ( agents per point )
724	INTEGER(iwp) :: jp !< index variable along y
725	INTEGER(iwp) :: loop_stride !< loop variable for initialization
726	INTEGER(iwp) :: n !< loop variable ( number of agents )
727	INTEGER(iwp) :: new_size !< new size of allocated memory for agents
728	INTEGER(iwp) :: rn_side !< index of agent path
729
730	INTEGER(iwp), INTENT(IN) :: phase !< mode of inititialization
731
732	INTEGER(iwp), DIMENSION(nysg:nyng,nxlg:nxrg) :: local_count !< start address of new agent
733	INTEGER(iwp), DIMENSION(nysg:nyng,nxlg:nxrg) :: local_start !< start address of new agent
734
735	LOGICAL :: first_stride !< flag for initialization
736
737	REAL(wp) :: pos_x !< increment for agent position in x
738	REAL(wp) :: pos_y !< increment for agent position in y
739	REAL(wp) :: rand_contr !< dummy argument for random position
740	REAL(wp) :: rn_side_dum !< index of agent path
741
742	TYPE(agent_type),TARGET :: tmp_agent !< temporary agent used for initialization
743
744	!
745	!-- Calculate agent positions and store agent attributes, if
746	!-- agent is situated on this PE
747	DO loop_stride = 1, 2
748	first_stride = (loop_stride == 1)
749	IF ( first_stride ) THEN
750	local_count = 0 ! count number of agents
751	ELSE
752	local_count = agt_count ! Start address of new agents
753	ENDIF
754
755	DO i = 1, number_of_agent_groups
756
757	pos_y = ass(i)
758
759	DO WHILE ( pos_y <= asn(i) )
760
761	IF ( pos_y >= nys * dy .AND. &
762	pos_y < ( nyn + 1 ) * dy ) &
763	THEN
764
765	pos_x = asl(i)
766
767	xloop: DO WHILE ( pos_x <= asr(i) )
768
769	IF ( pos_x >= nxl * dx .AND. &
770	pos_x < ( nxr + 1) * dx ) &
771	THEN
772
773	tmp_agent%agent_mask = .TRUE.
774	tmp_agent%group = i
775	tmp_agent%id = 0_idp
776	tmp_agent%block_nr = -1
777	tmp_agent%path_counter = 999 !SIZE(tmp_agent%path_x)
778	tmp_agent%age = 0.0_wp
779	tmp_agent%age_m = 0.0_wp
780	tmp_agent%dt_sum = 0.0_wp
781	tmp_agent%clo = 99999.0_wp
782	tmp_agent%energy_storage= 0.0_wp
783	tmp_agent%force_x = 0.0_wp
784	tmp_agent%force_y = 0.0_wp
785	tmp_agent%origin_x = pos_x
786	tmp_agent%origin_y = pos_y
787	tmp_agent%speed_abs = 0.0_wp
788	tmp_agent%speed_e_x = 0.0_wp
789	tmp_agent%speed_e_y = 0.0_wp
790	tmp_agent%speed_des = random_normal(desired_speed,&
791	des_sp_sig)
792	tmp_agent%speed_x = 0.0_wp
793	tmp_agent%speed_y = 0.0_wp
794	tmp_agent%thermal_index = 99999.0_wp
795	tmp_agent%x = pos_x
796	tmp_agent%y = pos_y
797	tmp_agent%path_x = -1.0_wp
798	tmp_agent%path_y = -1.0_wp
799	tmp_agent%t_x = - pi
800	tmp_agent%t_y = - pi
801	!
802	!-- Determine the grid indices of the agent position
803	ip = tmp_agent%x * ddx
804	jp = tmp_agent%y * ddy
805	!
806	!-- Give each agent its target
807	IF ( a_rand_target(i) ) THEN
808	!
809	!-- Agent shall receive random target just outside
810	!-- simulated area
811	rn_side_dum = random_function(iran_agent)
812	rn_side = FLOOR(4.*rn_side_dum)
813	IF ( rn_side < 2 ) THEN
814	IF ( rn_side == 0 ) THEN
815	tmp_agent%t_y = -2*dy
816	ELSE
817	tmp_agent%t_y = (ny+3)*dy
818	ENDIF
819	tmp_agent%t_x = random_function(iran_agent) * &
820	(nx+1)*dx
821	ELSE
822	IF ( rn_side == 2 ) THEN
823	tmp_agent%t_x = -2*dx
824	ELSE
825	tmp_agent%t_x = (nx+3)*dx
826	ENDIF
827	tmp_agent%t_y = random_function(iran_agent) * &
828	(ny+1)*dy
829	ENDIF
830	!
831	!-- Agent gets target of her group
832	ELSE
833	tmp_agent%t_x = at_x(i)
834	tmp_agent%t_y = at_y(i)
835	ENDIF
836
837	local_count(jp,ip) = local_count(jp,ip) + 1
838
839	IF ( .NOT. first_stride ) THEN
840	grid_agents(jp,ip)%agents(local_count(jp,ip)) &
841	= tmp_agent
842	ENDIF
843
844	ENDIF
845
846	pos_x = pos_x + adx(i)
847
848	ENDDO xloop
849
850	ENDIF
851
852	pos_y = pos_y + ady(i)
853
854	ENDDO
855
856	ENDDO
857
858	!
859	!-- Allocate or reallocate agents array to new size
860	IF ( first_stride ) THEN
861	DO ip = nxlg, nxrg
862	DO jp = nysg, nyng
863	IF ( phase == PHASE_INIT ) THEN
864	IF ( local_count(jp,ip) > 0 ) THEN
865	alloc_size = MAX( INT( local_count(jp,ip) * &
866	( 1.0_wp + alloc_factor_mas / 100.0_wp ) ), &
867	min_nr_agent )
868	ELSE
869	alloc_size = min_nr_agent
870	ENDIF
871	ALLOCATE(grid_agents(jp,ip)%agents(1:alloc_size))
872	DO n = 1, alloc_size
873	grid_agents(jp,ip)%agents(n) = zero_agent
874	ENDDO
875	ELSEIF ( phase == PHASE_RELEASE ) THEN
876	IF ( local_count(jp,ip) > 0 ) THEN
877	new_size = local_count(jp,ip) + agt_count(jp,ip)
878	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
879	alloc_factor_mas / 100.0_wp ) ), min_nr_agent )
880	IF( alloc_size > SIZE( grid_agents(jp,ip)%agents) ) &
881	THEN
882	CALL mas_eh_realloc_agents_array(ip,jp,alloc_size)
883	ENDIF
884	ENDIF
885	ENDIF
886	ENDDO
887	ENDDO
888	ENDIF
889
890	ENDDO
891
892	local_start = agt_count+1
893	agt_count = local_count
894
895	!
896	!-- Calculate agent IDs
897	DO ip = nxl, nxr
898	DO jp = nys, nyn
899	number_of_agents = agt_count(jp,ip)
900	IF ( number_of_agents <= 0 ) CYCLE
901	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
902
903	DO n = local_start(jp,ip), number_of_agents !only new agents
904
905	agents(n)%id = 10000_idp*2 grid_agents(jp,ip)%id_counter + &
906	10000_idp * jp + ip
907	!
908	!-- Count the number of agents that have been released before
909	grid_agents(jp,ip)%id_counter = grid_agents(jp,ip)%id_counter &
910	+ 1
911
912	ENDDO
913
914	ENDDO
915	ENDDO
916
917	!
918	!-- Add random fluctuation to agent positions.
919	IF ( random_start_position_agents ) THEN
920	DO ip = nxl, nxr
921	DO jp = nys, nyn
922	number_of_agents = agt_count(jp,ip)
923	IF ( number_of_agents <= 0 ) CYCLE
924	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
925	!
926	!-- Move only new agents. Moreover, limit random fluctuation
927	!-- in order to prevent that agents move more than one grid box,
928	!-- which would lead to problems concerning agent exchange
929	!-- between processors in case adx/ady are larger than dx/dy,
930	!-- respectively.
931	DO n = local_start(jp,ip), number_of_agents
932	IF ( asl(agents(n)%group) /= asr(agents(n)%group) ) THEN
933	rand_contr = ( random_function( iran_agent ) - 0.5_wp ) *&
934	adx(agents(n)%group)
935	agents(n)%x = agents(n)%x + &
936	MERGE( rand_contr, SIGN( dx, rand_contr ), &
937	ABS( rand_contr ) < dx &
938	)
939	ENDIF
940	IF ( ass(agents(n)%group) /= asn(agents(n)%group) ) THEN
941	rand_contr = ( random_function( iran_agent ) - 0.5_wp ) *&
942	ady(agents(n)%group)
943	agents(n)%y = agents(n)%y + &
944	MERGE( rand_contr, SIGN( dy, rand_contr ), &
945	ABS( rand_contr ) < dy )
946	ENDIF
947	ENDDO
948	!
949	!-- Delete agents that have been simulated longer than allowed
950	CALL mas_boundary_conds( 'max_sim_time' )
951	!
952	!-- Delete agents that have reached target area
953	CALL mas_boundary_conds( 'target_area' )
954
955	ENDDO
956	ENDDO
957	!
958	!-- Exchange agents between grid cells and processors
959	CALL mas_eh_move_agent
960	CALL mas_eh_exchange_horiz
961
962	ENDIF
963	!
964	!-- In case of random_start_position_agents, delete agents identified by
965	!-- mas_eh_exchange_horiz and mas_boundary_conds. Then sort agents into
966	!-- blocks, which is needed for a fast interpolation of the LES fields
967	!-- on the agent position.
968	CALL mas_ps_sort_in_subboxes
969
970	!
971	!-- Determine the current number of agents
972	number_of_agents = 0
973	DO ip = nxl, nxr
974	DO jp = nys, nyn
975	number_of_agents = number_of_agents + agt_count(jp,ip)
976	ENDDO
977	ENDDO
978	!
979	!-- Calculate the number of agents of the total domain
980	#if defined( __parallel )
981	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
982	CALL MPI_ALLREDUCE( number_of_agents, total_number_of_agents, 1, &
983	MPI_INTEGER, MPI_SUM, comm2d, ierr )
984	#else
985	total_number_of_agents = number_of_agents
986	#endif
987
988	RETURN
989
990	END SUBROUTINE mas_create_agent
991
992	!------------------------------------------------------------------------------!
993	! Description:
994	! ------------
995	!> Creates flags that indicate if a gridbox contains edges or corners. These
996	!> flags are used for agents to check if obstacles are close to them.
997	!------------------------------------------------------------------------------!
998	SUBROUTINE mas_create_obstacle_flags
999
1000	USE arrays_3d, &
1001	ONLY: zw
1002
1003	IMPLICIT NONE
1004
1005	INTEGER(iwp) :: agt_size !< Agent size in bytes
1006	INTEGER(iwp) :: dummy !< dummy
1007	INTEGER(iwp) :: il
1008	INTEGER(iwp) :: jl
1009
1010	ALLOCATE(obstacle_flags(nysg:nyng,nxlg:nxrg))
1011
1012	obstacle_flags = 0
1013
1014	DO il = nxlg, nxrg
1015	DO jl = nysg, nyng
1016	!
1017	!-- Exclude cyclic topography boundary
1018	IF ( il < 0 .OR. il > nx .OR. jl < 0 .OR. jl > ny ) CYCLE
1019	!
1020	!-- North edge
1021	IF ( jl < nyng ) THEN
1022	IF ( ( top_top_s(jl,il) - top_top_s(jl+1,il) ) > 1 .AND. &
1023	( zw( top_top_w(jl,il) ) - &
1024	zw( top_top_w(jl+1,il) ) ) > .51_wp ) &
1025	THEN
1026	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 0 )
1027	ENDIF
1028	ENDIF
1029	!
1030	!-- North right corner
1031	IF ( jl < nyng .AND. il < nxrg ) THEN
1032	IF ( ( top_top_s(jl,il) - top_top_s(jl+1,il) ) > 1 .AND. &
1033	( top_top_s(jl,il) - top_top_s(jl+1,il+1) ) > 1 .AND. &
1034	( top_top_s(jl,il) - top_top_s(jl,il+1) ) > 1 .AND. &
1035	( zw( top_top_w(jl,il) ) - &
1036	zw( top_top_w(jl+1,il+1) ) ) > .51_wp ) &
1037	THEN
1038	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 1 )
1039	ENDIF
1040	ENDIF
1041	!
1042	!-- Right edge
1043	IF ( il < nxrg ) THEN
1044	IF ( ( top_top_s(jl,il) - top_top_s(jl,il+1) ) > 1 .AND. &
1045	( zw( top_top_w(jl,il) ) - &
1046	zw( top_top_w(jl,il+1) ) ) > .51_wp ) &
1047	THEN
1048	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 2 )
1049	ENDIF
1050	ENDIF
1051	!
1052	!-- South right corner
1053	IF ( jl > nysg .AND. il < nxrg ) THEN
1054	IF ( ( top_top_s(jl,il) - top_top_s(jl,il+1) ) > 1 .AND. &
1055	( top_top_s(jl,il) - top_top_s(jl-1,il+1) ) > 1 .AND. &
1056	( top_top_s(jl,il) - top_top_s(jl-1,il) ) > 1 .AND. &
1057	( zw(top_top_w(jl,il)) - &
1058	zw( top_top_w(jl-1,il+1) ) ) > .51_wp ) &
1059	THEN
1060	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 3 )
1061	ENDIF
1062	ENDIF
1063	!
1064	!-- South edge
1065	IF ( jl > nysg ) THEN
1066	IF ( ( top_top_s(jl,il) - top_top_s(jl-1,il) ) > 1 .AND. &
1067	( zw( top_top_w(jl,il) ) - &
1068	zw( top_top_w(jl-1,il) ) ) > .51_wp ) &
1069	THEN
1070	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 4 )
1071	ENDIF
1072	ENDIF
1073	!
1074	!-- South left corner
1075	IF ( jl > nysg .AND. il > nxlg ) THEN
1076	IF ( ( top_top_s(jl,il) - top_top_s(jl-1,il) ) > 1 .AND. &
1077	( top_top_s(jl,il) - top_top_s(jl-1,il-1) ) > 1 .AND. &
1078	( top_top_s(jl,il) - top_top_s(jl,il-1) ) > 1 .AND. &
1079	( zw( top_top_w(jl,il) ) - &
1080	zw(top_top_w(jl-1,il-1) ) ) > .51_wp ) &
1081	THEN
1082	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 5 )
1083	ENDIF
1084	ENDIF
1085	!
1086	!-- Left edge
1087	IF ( il > nxlg ) THEN
1088	IF ( ( top_top_s(jl,il) - top_top_s(jl,il-1) ) > 1 .AND. &
1089	( zw(top_top_w(jl,il) ) - &
1090	zw(top_top_w(jl,il-1) ) ) > .51_wp ) &
1091	THEN
1092	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 6 )
1093	ENDIF
1094	ENDIF
1095	!
1096	!-- North left corner
1097	IF ( jl < nyng .AND. il > nxlg ) THEN
1098	IF ( ( top_top_s(jl,il) - top_top_s(jl,il-1) ) > 1 .AND. &
1099	( top_top_s(jl,il) - top_top_s(jl+1,il-1) ) > 1 .AND. &
1100	( top_top_s(jl,il) - top_top_s(jl+1,il) ) > 1 .AND. &
1101	( zw( top_top_w(jl,il) ) - &
1102	zw( top_top_w(jl+1,il-1) ) ) > .51_wp ) &
1103	THEN
1104	obstacle_flags(jl,il) = IBSET( obstacle_flags(jl,il), 7 )
1105	ENDIF
1106	ENDIF
1107
1108	ENDDO
1109	ENDDO
1110
1111	END SUBROUTINE mas_create_obstacle_flags
1112
1113	!------------------------------------------------------------------------------!
1114	! Description:
1115	! ------------
1116	!> Write agent data in netCDF format
1117	!------------------------------------------------------------------------------!
1118	SUBROUTINE mas_data_output_agents( ftest )
1119
1120	USE control_parameters, &
1121	ONLY: agt_time_count
1122
1123	USE netcdf_interface, &
1124	ONLY: nc_stat, id_set_agt, id_var_time_agt, id_var_rnoa_agt, &
1125	id_var_agt, netcdf_handle_error
1126
1127	USE pegrid
1128
1129	#if defined( __netcdf )
1130	USE NETCDF
1131	#endif
1132
1133	IMPLICIT NONE
1134
1135	INTEGER(iwp) :: agt_size !< Agent size in bytes
1136	INTEGER(iwp) :: dummy !< dummy
1137	INTEGER(iwp) :: ip !< counter (x)
1138	INTEGER(iwp) :: jp !< counter (y)
1139	INTEGER(iwp) :: n !< counter (number of PEs)
1140	INTEGER(iwp) :: noa !< number of agents
1141	INTEGER(iwp) :: noa_rcv !< received number of agents
1142	INTEGER(iwp) :: out_noa !< number of agents for output
1143
1144	INTEGER(iwp), DIMENSION(0:numprocs-1) :: noa_arr !< number of agents on each PE
1145
1146	TYPE(agent_type), DIMENSION(:), ALLOCATABLE, TARGET :: trf_agents !< all agents on current PE
1147	TYPE(agent_type), DIMENSION(:), ALLOCATABLE, TARGET :: out_agents !< all agents in entire domain
1148	LOGICAL, INTENT (INOUT) :: ftest
1149
1150	CALL cpu_log( log_point_s(17), 'mas_data_output', 'start' )
1151	!
1152	!-- Get total number of agents and put all agents on one PE in one array
1153	noa = 0
1154	DO ip = nxl, nxr
1155	DO jp = nys, nyn
1156	noa = noa + agt_count(jp,ip)
1157	ENDDO
1158	ENDDO
1159	IF(noa > 0) THEN
1160	ALLOCATE(trf_agents(1:noa))
1161	dummy = 1
1162	DO ip = nxl, nxr
1163	DO jp = nys, nyn
1164	IF ( agt_count(jp,ip) == 0 ) CYCLE
1165	agents => grid_agents(jp,ip)%agents(1:agt_count(jp,ip))
1166	trf_agents(dummy:(dummy-1+agt_count(jp,ip))) = agents
1167	dummy = dummy + agt_count(jp,ip)
1168	ENDDO
1169	ENDDO
1170	ENDIF
1171	#if defined( __parallel )
1172	!
1173	!-- Gather all agents on PE0 for output
1174	CALL MPI_BARRIER( comm2d, ierr )
1175	IF ( myid == 0 ) THEN
1176	noa_arr(0) = noa
1177	!
1178	!-- Receive data from all other PEs.
1179	DO n = 1, numprocs-1
1180	CALL MPI_RECV( noa_arr(n), 1, MPI_INTEGER, &
1181	n, 0, comm2d, status, ierr )
1182	ENDDO
1183	ELSE
1184	CALL MPI_SEND( noa, 1, MPI_INTEGER, 0, 0, comm2d, ierr )
1185	ENDIF
1186	CALL MPI_BARRIER( comm2d, ierr )
1187	agt_size = STORAGE_SIZE(zero_agent)/8
1188	IF ( myid == 0 ) THEN
1189	!
1190	!-- Receive data from all other PEs.
1191	out_noa = SUM(noa_arr)
1192	IF ( out_noa > 0 ) THEN
1193	ALLOCATE( out_agents(1:out_noa) )
1194	IF ( noa > 0 ) THEN
1195	out_agents(1:noa) = trf_agents
1196	ENDIF
1197	noa_rcv = noa
1198	DO n = 1, numprocs-1
1199	IF ( noa_arr(n) > 0 ) THEN
1200	CALL MPI_RECV( out_agents(noa_rcv+1), noa_arr(n)*agt_size, &
1201	MPI_BYTE, n, 0, comm2d, status, ierr )
1202	noa_rcv = noa_rcv + noa_arr(n)
1203	ENDIF
1204	ENDDO
1205	ELSE
1206	ALLOCATE( out_agents(1:2) )
1207	out_agents = zero_agent
1208	out_noa = 2
1209	ENDIF
1210	ELSE
1211	IF ( noa > 0 ) THEN
1212	CALL MPI_SEND( trf_agents(1), noa*agt_size, MPI_BYTE, 0, 0, &
1213	comm2d, ierr )
1214	ENDIF
1215	ENDIF
1216	!
1217	!-- A barrier has to be set, because otherwise some PEs may
1218	!-- proceed too fast so that PE0 may receive wrong data on
1219	!-- tag 0
1220	CALL MPI_BARRIER( comm2d, ierr )
1221	#endif
1222	IF ( myid == 0 ) THEN
1223	#if defined( __parallel )
1224	agents=>out_agents
1225	#else
1226	agents=>trf_agents
1227	#endif
1228
1229	#if defined( __netcdf )
1230
1231	!-- Output in netCDF format
1232	IF ( ftest ) CALL check_open( 118 )
1233
1234	!
1235	!-- Update the NetCDF time axis
1236	agt_time_count = agt_time_count + 1
1237
1238	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_time_agt, &
1239	(/ time_since_reference_point /), &
1240	start = (/ agt_time_count /), count = (/ 1 /) )
1241	CALL netcdf_handle_error( 'mas_data_output_agents', 1 )
1242
1243	!
1244	!-- Output all agent attributes
1245	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(1), agents%x, &
1246	start = (/ 1, agt_time_count /), &
1247	count = (/ out_noa /) )
1248	CALL netcdf_handle_error( 'mas_data_output_agents', 3 )
1249
1250	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(2), agents%y, &
1251	start = (/ 1, agt_time_count /), &
1252	count = (/ out_noa /) )
1253	CALL netcdf_handle_error( 'mas_data_output_agents', 4 )
1254
1255	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(3), agents%windspeed, &
1256	start = (/ 1, agt_time_count /), &
1257	count = (/ out_noa /) )
1258	CALL netcdf_handle_error( 'mas_data_output_agents', 5 )
1259
1260	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(4), agents%t, &
1261	start = (/ 1, agt_time_count /), &
1262	count = (/ out_noa /) )
1263	CALL netcdf_handle_error( 'mas_data_output_agents', 6 )
1264
1265	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(5), agents%group, &
1266	start = (/ 1, agt_time_count /), &
1267	count = (/ out_noa /) )
1268	CALL netcdf_handle_error( 'mas_data_output_agents', 7 )
1269
1270	nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(6), agents%id, &
1271	start = (/ 1, agt_time_count /), &
1272	count = (/ out_noa /) )
1273	CALL netcdf_handle_error( 'mas_data_output_agents', 8 )
1274
1275
1276	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(6), agents%pm10, &
1277	! start = (/ 1, agt_time_count /), &
1278	! count = (/ out_noa /) )
1279	! CALL netcdf_handle_error( 'mas_data_output_agents', 8 )
1280	!
1281	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(7), agents%pm25, &
1282	! start = (/ 1, agt_time_count /), &
1283	! count = (/ out_noa /) )
1284	! CALL netcdf_handle_error( 'mas_data_output_agents', 9 )
1285	!
1286	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(8), agents%therm_comf,&
1287	! start = (/ 1, agt_time_count /), &
1288	! count = (/ out_noa /) )
1289	!
1290	! nc_stat = NF90_PUT_VAR( id_set_agt, id_var_agt(9), agents%uv, &
1291	! start = (/ 1, agt_time_count /), &
1292	! count = (/ out_noa /) )
1293	CALL netcdf_handle_error( 'mas_data_output_agents', 10 )
1294
1295	#endif
1296
1297	DEALLOCATE(out_agents)
1298	ENDIF
1299
1300	CALL cpu_log( log_point_s(17), 'mas_data_output', 'stop' )
1301
1302	END SUBROUTINE mas_data_output_agents
1303
1304	!------------------------------------------------------------------------------!
1305	! Description:
1306	! ------------
1307	!> If an agent moves from one processor to another, this subroutine moves
1308	!> the corresponding elements from the agent arrays of the old grid cells
1309	!> to the agent arrays of the new grid cells.
1310	!------------------------------------------------------------------------------!
1311	SUBROUTINE mas_eh_add_agents_to_gridcell (agent_array)
1312
1313	IMPLICIT NONE
1314
1315	INTEGER(iwp) :: aindex !< dummy argument for new number of agents per grid box
1316	INTEGER(iwp) :: ip !< grid index (x) of agent
1317	INTEGER(iwp) :: jp !< grid index (x) of agent
1318	INTEGER(iwp) :: n !< index variable of agent
1319
1320	LOGICAL :: pack_done !< flag to indicate that packing is done
1321
1322	TYPE(agent_type), DIMENSION(:), INTENT(IN) :: agent_array !< new agents in a grid box
1323	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: temp_ns !< temporary agent array for reallocation
1324
1325	pack_done = .FALSE.
1326
1327	DO n = 1, SIZE(agent_array)
1328
1329	IF ( .NOT. agent_array(n)%agent_mask ) CYCLE
1330
1331	ip = agent_array(n)%x * ddx
1332	jp = agent_array(n)%y * ddy
1333
1334	IF ( ip >= nxl .AND. ip <= nxr .AND. &
1335	jp >= nys .AND. jp <= nyn ) &
1336	THEN ! agent stays on processor
1337	number_of_agents = agt_count(jp,ip)
1338	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1339
1340	aindex = agt_count(jp,ip)+1
1341	IF( aindex > SIZE(grid_agents(jp,ip)%agents) ) THEN
1342	IF ( pack_done ) THEN
1343	CALL mas_eh_realloc_agents_array (ip,jp)
1344	ELSE
1345	CALL mas_ps_pack
1346	agt_count(jp,ip) = number_of_agents
1347	aindex = agt_count(jp,ip)+1
1348	IF ( aindex > SIZE(grid_agents(jp,ip)%agents) ) THEN
1349	CALL mas_eh_realloc_agents_array (ip,jp)
1350	ENDIF
1351	pack_done = .TRUE.
1352	ENDIF
1353	ENDIF
1354	grid_agents(jp,ip)%agents(aindex) = agent_array(n)
1355	agt_count(jp,ip) = aindex
1356	ELSE
1357	IF ( jp <= nys - 1 ) THEN
1358	nr_move_south = nr_move_south+1
1359	!
1360	!-- Before agent information is swapped to exchange-array, check
1361	!-- if enough memory is allocated. If required, reallocate exchange
1362	!-- array.
1363	IF ( nr_move_south > SIZE(move_also_south) ) THEN
1364	!
1365	!-- At first, allocate further temporary array to swap agent
1366	!-- information.
1367	ALLOCATE( temp_ns(SIZE(move_also_south)+NR_2_direction_move))
1368	temp_ns(1:nr_move_south-1) = move_also_south &
1369	(1:nr_move_south-1)
1370	DEALLOCATE( move_also_south )
1371	ALLOCATE( move_also_south(SIZE(temp_ns)) )
1372	move_also_south(1:nr_move_south-1) = temp_ns &
1373	(1:nr_move_south-1)
1374	DEALLOCATE( temp_ns )
1375
1376	ENDIF
1377
1378	move_also_south(nr_move_south) = agent_array(n)
1379
1380	IF ( jp == -1 ) THEN
1381	!
1382	!-- Apply boundary condition along y
1383	IF ( ibc_mas_ns == 0 ) THEN
1384	move_also_south(nr_move_south)%y = &
1385	move_also_south(nr_move_south)%y &
1386	+ ( ny + 1 ) * dy
1387	move_also_south(nr_move_south)%origin_y = &
1388	move_also_south(nr_move_south)%origin_y &
1389	+ ( ny + 1 ) * dy
1390	ELSEIF ( ibc_mas_ns == 1 ) THEN
1391	!
1392	!-- Agent absorption
1393	move_also_south(nr_move_south)%agent_mask = .FALSE.
1394	deleted_agents = deleted_agents + 1
1395
1396	ENDIF
1397	ENDIF
1398	ELSEIF ( jp >= nyn+1 ) THEN
1399	nr_move_north = nr_move_north+1
1400	!
1401	!-- Before agent information is swapped to exchange-array, check
1402	!-- if enough memory is allocated. If required, reallocate exchange
1403	!-- array.
1404	IF ( nr_move_north > SIZE(move_also_north) ) THEN
1405	!
1406	!-- At first, allocate further temporary array to swap agent
1407	!-- information.
1408	ALLOCATE( temp_ns(SIZE(move_also_north)+NR_2_direction_move))
1409	temp_ns(1:nr_move_north-1) = &
1410	move_also_south(1:nr_move_north-1)
1411	DEALLOCATE( move_also_north )
1412	ALLOCATE( move_also_north(SIZE(temp_ns)) )
1413	move_also_north(1:nr_move_north-1) = &
1414	temp_ns(1:nr_move_north-1)
1415	DEALLOCATE( temp_ns )
1416
1417	ENDIF
1418
1419	move_also_north(nr_move_north) = agent_array(n)
1420	IF ( jp == ny+1 ) THEN
1421	!
1422	!-- Apply boundary condition along y
1423	IF ( ibc_mas_ns == 0 ) THEN
1424
1425	move_also_north(nr_move_north)%y = &
1426	move_also_north(nr_move_north)%y &
1427	- ( ny + 1 ) * dy
1428	move_also_north(nr_move_north)%origin_y = &
1429	move_also_north(nr_move_north)%origin_y &
1430	- ( ny + 1 ) * dy
1431	ELSEIF ( ibc_mas_ns == 1 ) THEN
1432	!
1433	!-- Agent absorption
1434	move_also_north(nr_move_north)%agent_mask = .FALSE.
1435	deleted_agents = deleted_agents + 1
1436
1437	ENDIF
1438	ENDIF
1439	ENDIF
1440	ENDIF
1441	ENDDO
1442
1443	RETURN
1444
1445	END SUBROUTINE mas_eh_add_agents_to_gridcell
1446
1447	!------------------------------------------------------------------------------!
1448	! Description:
1449	! ------------
1450	!> After ghost layer agents have been received from neighboring PEs, this
1451	!> subroutine sorts them into the corresponding grid cells
1452	!------------------------------------------------------------------------------!
1453	SUBROUTINE mas_eh_add_ghost_agents_to_gridcell (agent_array)
1454
1455	IMPLICIT NONE
1456
1457	INTEGER(iwp) :: ip !< grid index (x) of agent
1458	INTEGER(iwp) :: jp !< grid index (x) of agent
1459	INTEGER(iwp) :: n !< index variable of agent
1460	INTEGER(iwp) :: aindex !< dummy argument for new number of agents per grid box
1461
1462	LOGICAL :: pack_done !< flag to indicate that packing is done
1463
1464	TYPE(agent_type), DIMENSION(:), INTENT(IN) :: agent_array !< new agents in a grid box
1465	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: temp_ns !< temporary agent array for reallocation
1466
1467	pack_done = .FALSE.
1468
1469	DO n = 1, SIZE(agent_array)
1470
1471	IF ( .NOT. agent_array(n)%agent_mask ) CYCLE
1472
1473	ip = agent_array(n)%x * ddx
1474	jp = agent_array(n)%y * ddy
1475
1476	IF ( ip < nxl .OR. ip > nxr .OR. jp < nys .OR. jp > nyn ) THEN
1477	number_of_agents = agt_count(jp,ip)
1478	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1479
1480	aindex = agt_count(jp,ip)+1
1481	IF( aindex > SIZE(grid_agents(jp,ip)%agents) ) THEN
1482	IF ( pack_done ) THEN
1483	CALL mas_eh_realloc_agents_array (ip,jp)
1484	ELSE
1485	CALL mas_ps_pack
1486	agt_count(jp,ip) = number_of_agents
1487	aindex = agt_count(jp,ip)+1
1488	IF ( aindex > SIZE(grid_agents(jp,ip)%agents) ) THEN
1489	CALL mas_eh_realloc_agents_array (ip,jp)
1490	ENDIF
1491	pack_done = .TRUE.
1492	ENDIF
1493	ENDIF
1494	grid_agents(jp,ip)%agents(aindex) = agent_array(n)
1495	agt_count(jp,ip) = aindex
1496	ENDIF
1497	ENDDO
1498	END SUBROUTINE mas_eh_add_ghost_agents_to_gridcell
1499
1500	!------------------------------------------------------------------------------!
1501	! Description:
1502	! ------------
1503	!> Resizing of agent arrays
1504	!------------------------------------------------------------------------------!
1505	SUBROUTINE mas_eh_dealloc_agents_array
1506
1507	IMPLICIT NONE
1508
1509	INTEGER(iwp) :: i !< grid index (x) of agent
1510	INTEGER(iwp) :: j !< grid index (y) of agent
1511	INTEGER(iwp) :: old_size !< old array size
1512	INTEGER(iwp) :: new_size !< new array size
1513	INTEGER(iwp) :: noa !< number of agents
1514
1515	LOGICAL :: dealloc !< flag that indicates if reallocation is necessary
1516
1517	TYPE(agent_type), DIMENSION(10) :: tmp_agents_s !< temporary static agent array
1518
1519	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: tmp_agents_d !< temporary dynamic agent array
1520
1521	DO i = nxlg, nxrg
1522	DO j = nysg, nyng
1523	!
1524	!-- Determine number of active agents
1525	noa = agt_count(j,i)
1526	!
1527	!-- Determine allocated memory size
1528	old_size = SIZE( grid_agents(j,i)%agents )
1529	!
1530	!-- Check for large unused memory
1531	dealloc = ( ( noa < min_nr_agent .AND. old_size > min_nr_agent ) &
1532	.OR. ( noa > min_nr_agent .AND. old_size - noa * &
1533	( 1.0_wp + 0.01_wp * alloc_factor_mas ) > 0.0_wp ) )
1534	!
1535	!-- If large unused memory was found, resize the corresponding array
1536	IF ( dealloc ) THEN
1537	IF ( noa < min_nr_agent ) THEN
1538	new_size = min_nr_agent
1539	ELSE
1540	new_size = INT( noa * ( 1.0_wp + &
1541	0.01_wp * alloc_factor_mas ) )
1542	ENDIF
1543
1544	IF ( noa <= 10 ) THEN
1545
1546	tmp_agents_s(1:noa) = grid_agents(j,i)%agents(1:noa)
1547
1548	DEALLOCATE(grid_agents(j,i)%agents)
1549	ALLOCATE(grid_agents(j,i)%agents(1:new_size))
1550
1551	grid_agents(j,i)%agents(1:noa) = tmp_agents_s(1:noa)
1552	grid_agents(j,i)%agents(noa+1:new_size) = zero_agent
1553
1554	ELSE
1555
1556	ALLOCATE(tmp_agents_d(noa))
1557	tmp_agents_d(1:noa) = grid_agents(j,i)%agents(1:noa)
1558
1559	DEALLOCATE(grid_agents(j,i)%agents)
1560	ALLOCATE(grid_agents(j,i)%agents(new_size))
1561
1562	grid_agents(j,i)%agents(1:noa) = tmp_agents_d(1:noa)
1563	grid_agents(j,i)%agents(noa+1:new_size) = zero_agent
1564
1565	DEALLOCATE(tmp_agents_d)
1566
1567	ENDIF
1568
1569	ENDIF
1570	ENDDO
1571	ENDDO
1572
1573	END SUBROUTINE mas_eh_dealloc_agents_array
1574
1575	!------------------------------------------------------------------------------!
1576	! Description:
1577	! ------------
1578	!> Exchange between subdomains.
1579	!> As soon as one agent has moved beyond the boundary of the domain, it
1580	!> is included in the relevant transfer arrays and marked for subsequent
1581	!> deletion on this PE.
1582	!> First sweep for crossings in x direction. Find out first the number of
1583	!> agents to be transferred and allocate temporary arrays needed to store
1584	!> them.
1585	!> For a one-dimensional decomposition along y, no transfer is necessary,
1586	!> because the agent remains on the PE, but the agent coordinate has to
1587	!> be adjusted.
1588	!------------------------------------------------------------------------------!
1589	SUBROUTINE mas_eh_exchange_horiz
1590
1591	IMPLICIT NONE
1592
1593	INTEGER(iwp) :: i !< grid index (x) of agent positition
1594	INTEGER(iwp) :: ip !< index variable along x
1595	INTEGER(iwp) :: j !< grid index (y) of agent positition
1596	INTEGER(iwp) :: jp !< index variable along y
1597	INTEGER(iwp) :: kp !< index variable along z
1598	INTEGER(iwp) :: n !< agent index variable
1599	INTEGER(iwp) :: par_size !< Agent size in bytes
1600	INTEGER(iwp) :: trla_count !< number of agents send to left PE
1601	INTEGER(iwp) :: trla_count_recv !< number of agents receive from right PE
1602	INTEGER(iwp) :: trna_count !< number of agents send to north PE
1603	INTEGER(iwp) :: trna_count_recv !< number of agents receive from south PE
1604	INTEGER(iwp) :: trra_count !< number of agents send to right PE
1605	INTEGER(iwp) :: trra_count_recv !< number of agents receive from left PE
1606	INTEGER(iwp) :: trsa_count !< number of agents send to south PE
1607	INTEGER(iwp) :: trsa_count_recv !< number of agents receive from north PE
1608
1609	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvla !< agents received from right PE
1610	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvna !< agents received from south PE
1611	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvra !< agents received from left PE
1612	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: rvsa !< agents received from north PE
1613	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trla !< agents send to left PE
1614	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trna !< agents send to north PE
1615	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trra !< agents send to right PE
1616	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: trsa !< agents send to south PE
1617
1618	CALL cpu_log( log_point_s(18), 'mas_eh_exchange_horiz', 'start' )
1619
1620	#if defined( __parallel )
1621
1622	!
1623	!-- Exchange between subdomains.
1624	!-- As soon as one agent has moved beyond the boundary of the domain, it
1625	!-- is included in the relevant transfer arrays and marked for subsequent
1626	!-- deletion on this PE.
1627	!-- First sweep for crossings in x direction. Find out first the number of
1628	!-- agents to be transferred and allocate temporary arrays needed to store
1629	!-- them.
1630	!-- For a one-dimensional decomposition along y, no transfer is necessary,
1631	!-- because the agent remains on the PE, but the agent coordinate has to
1632	!-- be adjusted.
1633	trla_count = 0
1634	trra_count = 0
1635
1636	trla_count_recv = 0
1637	trra_count_recv = 0
1638
1639	IF ( pdims(1) /= 1 ) THEN
1640	!
1641	!-- First calculate the storage necessary for sending and receiving the data.
1642	!-- Compute only first (nxl) and last (nxr) loop iterration.
1643	DO ip = nxl, nxr, nxr - nxl
1644	DO jp = nys, nyn
1645
1646	number_of_agents = agt_count(jp,ip)
1647	IF ( number_of_agents <= 0 ) CYCLE
1648	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1649	DO n = 1, number_of_agents
1650	IF ( agents(n)%agent_mask ) THEN
1651	i = agents(n)%x * ddx
1652	!
1653	!-- Above calculation does not work for indices less than zero
1654	IF ( agents(n)%x < 0.0_wp ) i = -1
1655
1656	IF ( i < nxl ) THEN
1657	trla_count = trla_count + 1
1658	ELSEIF ( i > nxr ) THEN
1659	trra_count = trra_count + 1
1660	ENDIF
1661	ENDIF
1662	ENDDO
1663
1664	ENDDO
1665	ENDDO
1666
1667	IF ( trla_count == 0 ) trla_count = 1
1668	IF ( trra_count == 0 ) trra_count = 1
1669
1670	ALLOCATE( trla(trla_count), trra(trra_count) )
1671
1672	trla = zero_agent
1673	trra = zero_agent
1674
1675	trla_count = 0
1676	trra_count = 0
1677
1678	ENDIF
1679	!
1680	!-- Compute only first (nxl) and last (nxr) loop iterration
1681	DO ip = nxl, nxr, nxr-nxl
1682	DO jp = nys, nyn
1683	number_of_agents = agt_count(jp,ip)
1684	IF ( number_of_agents <= 0 ) CYCLE
1685	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1686	DO n = 1, number_of_agents
1687	!
1688	!-- Only those agents that have not been marked as 'deleted' may
1689	!-- be moved.
1690	IF ( agents(n)%agent_mask ) THEN
1691
1692	i = agents(n)%x * ddx
1693	!
1694	!-- Above calculation does not work for indices less than zero
1695	IF ( agents(n)%x < 0.0_wp ) i = -1
1696
1697	IF ( i < nxl ) THEN
1698	IF ( i < 0 ) THEN
1699	!
1700	!-- Apply boundary condition along x
1701	IF ( ibc_mas_lr == 0 ) THEN
1702	!
1703	!-- Cyclic condition
1704	IF ( pdims(1) == 1 ) THEN
1705	agents(n)%x = ( nx + 1 ) * dx + &
1706	agents(n)%x
1707	agents(n)%origin_x = ( nx + 1 ) * dx + &
1708	agents(n)%origin_x
1709	ELSE
1710	trla_count = trla_count + 1
1711	trla(trla_count) = agents(n)
1712	trla(trla_count)%x = ( nx + 1 ) * dx + &
1713	trla(trla_count)%x
1714	trla(trla_count)%origin_x = &
1715	trla(trla_count)%origin_x + &
1716	( nx + 1 ) * dx
1717	agents(n)%agent_mask = .FALSE.
1718	deleted_agents = deleted_agents + 1
1719
1720	IF ( trla(trla_count)%x >= &
1721	(nx + 1)* dx - 1.0E-12_wp ) &
1722	THEN
1723	trla(trla_count)%x = trla(trla_count)%x - &
1724	1.0E-10_wp
1725	trla(trla_count)%origin_x = &
1726	trla(trla_count)%origin_x - 1
1727	ENDIF
1728
1729	ENDIF
1730
1731	ELSEIF ( ibc_mas_lr == 1 ) THEN
1732	!
1733	!-- Agent absorption
1734	agents(n)%agent_mask = .FALSE.
1735	deleted_agents = deleted_agents + 1
1736
1737	ENDIF
1738	ELSE
1739	!
1740	!-- Store agent data in the transfer array, which will be
1741	!-- send to the neighbouring PE
1742	trla_count = trla_count + 1
1743	trla(trla_count) = agents(n)
1744	agents(n)%agent_mask = .FALSE.
1745	deleted_agents = deleted_agents + 1
1746
1747	ENDIF
1748
1749	ELSEIF ( i > nxr ) THEN
1750	IF ( i > nx ) THEN
1751	!
1752	!-- Apply boundary condition along x
1753	IF ( ibc_mas_lr == 0 ) THEN
1754	!
1755	!-- Cyclic condition
1756	IF ( pdims(1) == 1 ) THEN
1757	agents(n)%x = agents(n)%x - ( nx + 1 ) * dx
1758	agents(n)%origin_x = agents(n)%origin_x - &
1759	( nx + 1 ) * dx
1760	ELSE
1761	trra_count = trra_count + 1
1762	trra(trra_count) = agents(n)
1763	trra(trra_count)%x = trra(trra_count)%x - &
1764	( nx + 1 ) * dx
1765	trra(trra_count)%origin_x = &
1766	trra(trra_count)%origin_x - &
1767	( nx + 1 ) * dx
1768	agents(n)%agent_mask = .FALSE.
1769	deleted_agents = deleted_agents + 1
1770
1771	ENDIF
1772
1773	ELSEIF ( ibc_mas_lr == 1 ) THEN
1774	!
1775	!-- Agent absorption
1776	agents(n)%agent_mask = .FALSE.
1777	deleted_agents = deleted_agents + 1
1778
1779	ENDIF
1780	ELSE
1781	!
1782	!-- Store agent data in the transfer array, which will be send
1783	!-- to the neighbouring PE
1784	trra_count = trra_count + 1
1785	trra(trra_count) = agents(n)
1786	agents(n)%agent_mask = .FALSE.
1787	deleted_agents = deleted_agents + 1
1788
1789	ENDIF
1790
1791	ENDIF
1792	ENDIF
1793
1794	ENDDO
1795	ENDDO
1796	ENDDO
1797
1798	!
1799	!-- Allocate arrays required for north-south exchange, as these
1800	!-- are used directly after agents are exchange along x-direction.
1801	ALLOCATE( move_also_north(1:NR_2_direction_move) )
1802	ALLOCATE( move_also_south(1:NR_2_direction_move) )
1803
1804	nr_move_north = 0
1805	nr_move_south = 0
1806	!
1807	!-- Send left boundary, receive right boundary (but first exchange how many
1808	!-- and chec if agent storage must be extended)
1809	IF ( pdims(1) /= 1 ) THEN
1810
1811	CALL MPI_SENDRECV( trla_count, 1, MPI_INTEGER, pleft, 0, &
1812	trra_count_recv, 1, MPI_INTEGER, pright, 0, &
1813	comm2d, status, ierr )
1814
1815	ALLOCATE(rvra(MAX(1,trra_count_recv)))
1816	!
1817	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
1818	!-- variables in structure agent_type (due to the calculation of par_size)
1819	par_size = STORAGE_SIZE(trla(1))/8
1820	CALL MPI_SENDRECV( trla, max(1,trla_count)*par_size, MPI_BYTE, pleft,&
1821	1, rvra, max(1,trra_count_recv)*par_size, MPI_BYTE, pright,&
1822	1, comm2d, status, ierr )
1823
1824	IF ( trra_count_recv > 0 ) THEN
1825	CALL mas_eh_add_agents_to_gridcell(rvra(1:trra_count_recv))
1826	ENDIF
1827
1828	DEALLOCATE(rvra)
1829
1830	!
1831	!-- Send right boundary, receive left boundary
1832	CALL MPI_SENDRECV( trra_count, 1, MPI_INTEGER, pright, 0, &
1833	trla_count_recv, 1, MPI_INTEGER, pleft, 0, &
1834	comm2d, status, ierr )
1835
1836	ALLOCATE(rvla(MAX(1,trla_count_recv)))
1837	!
1838	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
1839	!-- variables in structure agent_type (due to the calculation of par_size)
1840	par_size = STORAGE_SIZE(trra(1))/8
1841	CALL MPI_SENDRECV( trra, max(1,trra_count)*par_size, MPI_BYTE, &
1842	pright, 1, rvla, &
1843	max(1,trla_count_recv)*par_size, MPI_BYTE, &
1844	pleft, 1, comm2d, status, ierr )
1845
1846	IF ( trla_count_recv > 0 ) THEN
1847	CALL mas_eh_add_agents_to_gridcell(rvla(1:trla_count_recv))
1848	ENDIF
1849
1850	DEALLOCATE( rvla )
1851	DEALLOCATE( trla, trra )
1852
1853	ENDIF
1854
1855	!
1856	!-- Check whether agents have crossed the boundaries in y direction. Note
1857	!-- that this case can also apply to agents that have just been received
1858	!-- from the adjacent right or left PE.
1859	!-- Find out first the number of agents to be transferred and allocate
1860	!-- temporary arrays needed to store them.
1861	!-- For a one-dimensional decomposition along y, no transfer is necessary,
1862	!-- because the agent remains on the PE.
1863	trsa_count = nr_move_south
1864	trna_count = nr_move_north
1865
1866	trsa_count_recv = 0
1867	trna_count_recv = 0
1868
1869	IF ( pdims(2) /= 1 ) THEN
1870	!
1871	!-- First calculate the storage necessary for sending and receiving the
1872	!-- data
1873	DO ip = nxl, nxr
1874	DO jp = nys, nyn, nyn-nys !compute only first (nys) and last (nyn) loop iterration
1875	number_of_agents = agt_count(jp,ip)
1876	IF ( number_of_agents <= 0 ) CYCLE
1877	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1878	DO n = 1, number_of_agents
1879	IF ( agents(n)%agent_mask ) THEN
1880	j = agents(n)%y * ddy
1881	!
1882	!-- Above calculation does not work for indices less than zero
1883	IF ( agents(n)%y < 0.0_wp ) j = -1
1884
1885	IF ( j < nys ) THEN
1886	trsa_count = trsa_count + 1
1887	ELSEIF ( j > nyn ) THEN
1888	trna_count = trna_count + 1
1889	ENDIF
1890	ENDIF
1891	ENDDO
1892	ENDDO
1893	ENDDO
1894
1895	IF ( trsa_count == 0 ) trsa_count = 1
1896	IF ( trna_count == 0 ) trna_count = 1
1897
1898	ALLOCATE( trsa(trsa_count), trna(trna_count) )
1899
1900	trsa = zero_agent
1901	trna = zero_agent
1902
1903	trsa_count = nr_move_south
1904	trna_count = nr_move_north
1905
1906	trsa(1:nr_move_south) = move_also_south(1:nr_move_south)
1907	trna(1:nr_move_north) = move_also_north(1:nr_move_north)
1908
1909	ENDIF
1910
1911	DO ip = nxl, nxr
1912	DO jp = nys, nyn, nyn-nys ! compute only first (nys) and last (nyn) loop iterration
1913	number_of_agents = agt_count(jp,ip)
1914	IF ( number_of_agents <= 0 ) CYCLE
1915	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
1916	DO n = 1, number_of_agents
1917	!
1918	!-- Only those agents that have not been marked as 'deleted' may
1919	!-- be moved.
1920	IF ( agents(n)%agent_mask ) THEN
1921
1922	j = agents(n)%y * ddy
1923	!
1924	!-- Above calculation does not work for indices less than zero
1925	IF ( agents(n)%y < 0.0_wp * dy ) j = -1
1926
1927	IF ( j < nys ) THEN
1928	IF ( j < 0 ) THEN
1929	!
1930	!-- Apply boundary condition along y
1931	IF ( ibc_mas_ns == 0 ) THEN
1932	!
1933	!-- Cyclic condition
1934	IF ( pdims(2) == 1 ) THEN
1935	agents(n)%y = ( ny + 1 ) * dy + agents(n)%y
1936	agents(n)%origin_y = ( ny + 1 ) * dy + &
1937	agents(n)%origin_y
1938	ELSE
1939	trsa_count = trsa_count + 1
1940	trsa(trsa_count) = agents(n)
1941	trsa(trsa_count)%y = ( ny + 1 ) * dy + &
1942	trsa(trsa_count)%y
1943	trsa(trsa_count)%origin_y = &
1944	trsa(trsa_count)%origin_y &
1945	+ ( ny + 1 ) * dy
1946	agents(n)%agent_mask = .FALSE.
1947	deleted_agents = deleted_agents + 1
1948
1949	IF ( trsa(trsa_count)%y >= &
1950	(ny+1)* dy - 1.0E-12_wp ) &
1951	THEN
1952	trsa(trsa_count)%y = trsa(trsa_count)%y - &
1953	1.0E-10_wp
1954	trsa(trsa_count)%origin_y = &
1955	trsa(trsa_count)%origin_y - 1
1956	ENDIF
1957
1958	ENDIF
1959
1960	ELSEIF ( ibc_mas_ns == 1 ) THEN
1961	!
1962	!-- Agent absorption
1963	agents(n)%agent_mask = .FALSE.
1964	deleted_agents = deleted_agents + 1
1965
1966	ENDIF
1967	ELSE
1968	!
1969	!-- Store agent data in the transfer array, which will
1970	!-- be send to the neighbouring PE
1971	trsa_count = trsa_count + 1
1972	trsa(trsa_count) = agents(n)
1973	agents(n)%agent_mask = .FALSE.
1974	deleted_agents = deleted_agents + 1
1975
1976	ENDIF
1977
1978	ELSEIF ( j > nyn ) THEN
1979	IF ( j > ny ) THEN
1980	!
1981	!-- Apply boundary condition along y
1982	IF ( ibc_mas_ns == 0 ) THEN
1983	!
1984	!-- Cyclic condition
1985	IF ( pdims(2) == 1 ) THEN
1986	agents(n)%y = agents(n)%y - &
1987	( ny + 1 ) * dy
1988	agents(n)%origin_y = agents(n)%origin_y - &
1989	( ny + 1 ) * dy
1990	ELSE
1991	trna_count = trna_count + 1
1992	trna(trna_count) = agents(n)
1993	trna(trna_count)%y = &
1994	trna(trna_count)%y - ( ny + 1 ) * dy
1995	trna(trna_count)%origin_y = &
1996	trna(trna_count)%origin_y - &
1997	( ny + 1 ) * dy
1998	agents(n)%agent_mask = .FALSE.
1999	deleted_agents = deleted_agents + 1
2000	ENDIF
2001
2002	ELSEIF ( ibc_mas_ns == 1 ) THEN
2003	!
2004	!-- Agent absorption
2005	agents(n)%agent_mask = .FALSE.
2006	deleted_agents = deleted_agents + 1
2007
2008	ENDIF
2009	ELSE
2010	!
2011	!-- Store agent data in the transfer array, which will
2012	!-- be send to the neighbouring PE
2013	trna_count = trna_count + 1
2014	trna(trna_count) = agents(n)
2015	agents(n)%agent_mask = .FALSE.
2016	deleted_agents = deleted_agents + 1
2017
2018	ENDIF
2019
2020	ENDIF
2021	ENDIF
2022	ENDDO
2023	ENDDO
2024	ENDDO
2025
2026	!
2027	!-- Send front boundary, receive back boundary (but first exchange how many
2028	!-- and chec if agent storage must be extended)
2029	IF ( pdims(2) /= 1 ) THEN
2030
2031	CALL MPI_SENDRECV( trsa_count, 1, MPI_INTEGER, psouth, 0, &
2032	trna_count_recv, 1, MPI_INTEGER, pnorth, 0, &
2033	comm2d, status, ierr )
2034
2035	ALLOCATE(rvna(MAX(1,trna_count_recv)))
2036	!
2037	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
2038	!-- variables in structure agent_type (due to the calculation of par_size)
2039	par_size = STORAGE_SIZE(trsa(1))/8
2040	CALL MPI_SENDRECV( trsa, trsa_count*par_size, MPI_BYTE, &
2041	psouth, 1, rvna, &
2042	trna_count_recv*par_size, MPI_BYTE, pnorth, 1, &
2043	comm2d, status, ierr )
2044
2045	IF ( trna_count_recv > 0 ) THEN
2046	CALL mas_eh_add_agents_to_gridcell(rvna(1:trna_count_recv))
2047	ENDIF
2048
2049	DEALLOCATE(rvna)
2050
2051	!
2052	!-- Send back boundary, receive front boundary
2053	CALL MPI_SENDRECV( trna_count, 1, MPI_INTEGER, pnorth, 0, &
2054	trsa_count_recv, 1, MPI_INTEGER, psouth, 0, &
2055	comm2d, status, ierr )
2056
2057	ALLOCATE(rvsa(MAX(1,trsa_count_recv)))
2058	!
2059	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
2060	!-- variables in structure agent_type (due to the calculation of par_size)
2061	par_size = STORAGE_SIZE(trna(1))/8
2062	CALL MPI_SENDRECV( trna, trna_count*par_size, MPI_BYTE, &
2063	pnorth, 1, rvsa, &
2064	trsa_count_recv*par_size, MPI_BYTE, psouth, 1, &
2065	comm2d, status, ierr )
2066
2067	IF ( trsa_count_recv > 0 ) THEN
2068	CALL mas_eh_add_agents_to_gridcell(rvsa(1:trsa_count_recv))
2069	ENDIF
2070
2071	DEALLOCATE(rvsa)
2072
2073	number_of_agents = number_of_agents + trsa_count_recv
2074
2075	DEALLOCATE( trsa, trna )
2076
2077	ENDIF
2078
2079	DEALLOCATE( move_also_north )
2080	DEALLOCATE( move_also_south )
2081
2082	#else
2083
2084	DO ip = nxl, nxr, nxr-nxl
2085	DO jp = nys, nyn
2086	number_of_agents = agt_count(jp,ip)
2087	IF ( number_of_agents <= 0 ) CYCLE
2088	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
2089	DO n = 1, number_of_agents
2090	!
2091	!-- Apply boundary conditions
2092	IF ( agents(n)%x < 0.0_wp ) THEN
2093
2094	IF ( ibc_mas_lr == 0 ) THEN
2095	!
2096	!-- Cyclic boundary. Relevant coordinate has to be changed.
2097	agents(n)%x = ( nx + 1 ) * dx + agents(n)%x
2098	agents(n)%origin_x = ( nx + 1 ) * dx + &
2099	agents(n)%origin_x
2100	ELSEIF ( ibc_mas_lr == 1 ) THEN
2101	!
2102	!-- Agent absorption
2103	agents(n)%agent_mask = .FALSE.
2104	deleted_agents = deleted_agents + 1
2105	ENDIF
2106
2107	ELSEIF ( agents(n)%x >= ( nx + 1 ) * dx ) THEN
2108
2109	IF ( ibc_mas_lr == 0 ) THEN
2110	!
2111	!-- Cyclic boundary. Relevant coordinate has to be changed.
2112	agents(n)%x = agents(n)%x - ( nx + 1 ) * dx
2113
2114	ELSEIF ( ibc_mas_lr == 1 ) THEN
2115	!
2116	!-- Agent absorption
2117	agents(n)%agent_mask = .FALSE.
2118	deleted_agents = deleted_agents + 1
2119	ENDIF
2120
2121	ENDIF
2122	ENDDO
2123	ENDDO
2124	ENDDO
2125
2126	DO ip = nxl, nxr
2127	DO jp = nys, nyn, nyn-nys
2128	number_of_agents = agt_count(jp,ip)
2129	IF ( number_of_agents <= 0 ) CYCLE
2130	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
2131	DO n = 1, number_of_agents
2132
2133	IF ( agents(n)%y < 0.0_wp ) THEN
2134
2135	IF ( ibc_mas_ns == 0 ) THEN
2136	!
2137	!-- Cyclic boundary. Relevant coordinate has to be changed.
2138	agents(n)%y = ( ny + 1 ) * dy + agents(n)%y
2139	agents(n)%origin_y = ( ny + 1 ) * dy + &
2140	agents(n)%origin_y
2141
2142	ELSEIF ( ibc_mas_ns == 1 ) THEN
2143	!
2144	!-- Agent absorption
2145	agents(n)%agent_mask = .FALSE.
2146	deleted_agents = deleted_agents + 1
2147	ENDIF
2148
2149	ELSEIF ( agents(n)%y >= ( ny + 0.5_wp ) * dy ) THEN
2150
2151	IF ( ibc_mas_ns == 0 ) THEN
2152	!
2153	!-- Cyclic boundary. Relevant coordinate has to be changed.
2154	agents(n)%y = agents(n)%y - ( ny + 1 ) * dy
2155
2156	ELSEIF ( ibc_mas_ns == 1 ) THEN
2157	!
2158	!-- Agent absorption
2159	agents(n)%agent_mask = .FALSE.
2160	deleted_agents = deleted_agents + 1
2161	ENDIF
2162
2163	ENDIF
2164
2165	ENDDO
2166	ENDDO
2167	ENDDO
2168	#endif
2169
2170	!
2171	!-- Accumulate the number of agents transferred between the subdomains)
2172	CALL mas_eh_ghost_exchange
2173
2174	CALL cpu_log( log_point_s(18), 'mas_eh_exchange_horiz', 'stop' )
2175
2176	END SUBROUTINE mas_eh_exchange_horiz
2177
2178	!------------------------------------------------------------------------------!
2179	! Description:
2180	! ------------
2181	!> Sends the agents from the three gridcells closest to the
2182	!> north/south/left/right border of a PE to the corresponding neighbors ghost
2183	!> layer (which is three grid boxes deep)
2184	!------------------------------------------------------------------------------!
2185	SUBROUTINE mas_eh_ghost_exchange
2186
2187	IMPLICIT NONE
2188
2189	#if defined( __parallel )
2190
2191	INTEGER(iwp) :: i !< grid index (x) of agent positition
2192	INTEGER(iwp) :: ip !< index variable along x
2193	INTEGER(iwp) :: j !< grid index (y) of agent positition
2194	INTEGER(iwp) :: jp !< index variable along y
2195	INTEGER(iwp) :: agt_size !< Bit size of agent datatype
2196	INTEGER(iwp) :: ghla_count !< ghost points left agent
2197	INTEGER(iwp) :: ghna_count !< ghost points north agent
2198	INTEGER(iwp) :: ghra_count !< ghost points right agent
2199	INTEGER(iwp) :: ghsa_count !< ghost points south agent
2200
2201	LOGICAL :: ghla_empty !< ghost points left agent
2202	LOGICAL :: ghla_empty_rcv !< ghost points left agent
2203	LOGICAL :: ghna_empty !< ghost points north agent
2204	LOGICAL :: ghna_empty_rcv !< ghost points north agent
2205	LOGICAL :: ghra_empty !< ghost points right agent
2206	LOGICAL :: ghra_empty_rcv !< ghost points right agent
2207	LOGICAL :: ghsa_empty !< ghost points south agent
2208	LOGICAL :: ghsa_empty_rcv !< ghost points south agent
2209
2210	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghla !< agents received from right PE
2211	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghna !< agents received from south PE
2212	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghra !< agents received from left PE
2213	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: ghsa !< agents received from north PE
2214
2215	ghla_empty = .TRUE.
2216	ghna_empty = .TRUE.
2217	ghra_empty = .TRUE.
2218	ghsa_empty = .TRUE.
2219	!
2220	!-- reset ghost layer
2221	DO ip = nxlg, nxl-1
2222	DO jp = nysg, nyng
2223	agt_count(jp,ip) = 0
2224	ENDDO
2225	ENDDO
2226	DO ip = nxr+1, nxrg
2227	DO jp = nysg, nyng
2228	agt_count(jp,ip) = 0
2229	ENDDO
2230	ENDDO
2231	DO ip = nxl, nxr
2232	DO jp = nysg, nys-1
2233	agt_count(jp,ip) = 0
2234	ENDDO
2235	ENDDO
2236	DO ip = nxl, nxr
2237	DO jp = nyn+1, nyng
2238	agt_count(jp,ip) = 0
2239	ENDDO
2240	ENDDO
2241	!
2242	!-- Transfer of agents from left to right and vice versa
2243	IF ( pdims(1) /= 1 ) THEN
2244	!
2245	!-- Reset left and right ghost layers
2246	ghla_count = 0
2247	ghra_count = 0
2248	!
2249	!-- First calculate the storage necessary for sending
2250	!-- and receiving the data.
2251	ghla_count = SUM(agt_count(nys:nyn,nxl:nxl+2))
2252	ghra_count = SUM(agt_count(nys:nyn,nxr-2:nxr))
2253	!
2254	!-- No cyclic boundaries for agents
2255	IF ( nxl == 0 .OR. ghla_count == 0 ) THEN
2256	ghla_count = 1
2257	ELSE
2258	ghla_empty = .FALSE.
2259	ENDIF
2260	IF ( nxr == nx .OR. ghra_count == 0 ) THEN
2261	ghra_count = 1
2262	ELSE
2263	ghra_empty = .FALSE.
2264	ENDIF
2265	ALLOCATE( ghla(1:ghla_count), ghra(1:ghra_count) )
2266	ghla = zero_agent
2267	ghra = zero_agent
2268	!
2269	!-- Get all agents that will be sent left into one array
2270	ghla_count = 0
2271	IF ( nxl /= 0 ) THEN
2272	DO ip = nxl, nxl+2
2273	DO jp = nys, nyn
2274
2275	number_of_agents = agt_count(jp,ip)
2276	IF ( number_of_agents <= 0 ) CYCLE
2277	ghla(ghla_count+1:ghla_count+number_of_agents) &
2278	= grid_agents(jp,ip)%agents(1:number_of_agents)
2279	ghla_count = ghla_count + number_of_agents
2280
2281	ENDDO
2282	ENDDO
2283	ENDIF
2284	IF ( ghla_count == 0 ) ghla_count = 1
2285	!
2286	!-- Get all agents that will be sent right into one array
2287	ghra_count = 0
2288	IF ( nxr /= nx ) THEN
2289	DO ip = nxr-2, nxr
2290	DO jp = nys, nyn
2291
2292	number_of_agents = agt_count(jp,ip)
2293	IF ( number_of_agents <= 0 ) CYCLE
2294	ghra(ghra_count+1:ghra_count+number_of_agents) &
2295	= grid_agents(jp,ip)%agents(1:number_of_agents)
2296	ghra_count = ghra_count + number_of_agents
2297
2298	ENDDO
2299	ENDDO
2300	ENDIF
2301	IF ( ghra_count == 0 ) ghra_count = 1
2302	!
2303	!-- Send/receive number of agents that
2304	!-- will be transferred to/from left/right neighbor
2305	CALL MPI_SENDRECV( ghla_count, 1, MPI_INTEGER, pleft, 0, &
2306	ghra_count_recv, 1, MPI_INTEGER, pright, 0, &
2307	comm2d, status, ierr )
2308	ALLOCATE ( agt_gh_r(1:ghra_count_recv) )
2309	!
2310	!-- Send/receive number of agents that
2311	!-- will be transferred to/from right/left neighbor
2312	CALL MPI_SENDRECV( ghra_count, 1, MPI_INTEGER, pright, 0, &
2313	ghla_count_recv, 1, MPI_INTEGER, pleft, 0, &
2314	comm2d, status, ierr )
2315	!
2316	!-- Send/receive flag that indicates if there are actually any agents
2317	!-- in ghost layer
2318	CALL MPI_SENDRECV( ghla_empty, 1, MPI_LOGICAL, pleft, 1, &
2319	ghra_empty_rcv, 1, MPI_LOGICAL, pright,1, &
2320	comm2d, status, ierr )
2321	CALL MPI_SENDRECV( ghra_empty, 1, MPI_LOGICAL, pright,1, &
2322	ghla_empty_rcv, 1, MPI_LOGICAL, pleft, 1, &
2323	comm2d, status, ierr )
2324
2325
2326	ALLOCATE ( agt_gh_l(1:ghla_count_recv) )
2327	!
2328	!-- Get bit size of one agent
2329	agt_size = STORAGE_SIZE(zero_agent)/8
2330	!
2331	!-- Send/receive agents to/from left/right neighbor
2332	CALL MPI_SENDRECV( ghla, ghla_count * agt_size, MPI_BYTE, &
2333	pleft, 1, &
2334	agt_gh_r, ghra_count_recv * agt_size, MPI_BYTE, &
2335	pright,1, &
2336	comm2d, status, ierr )
2337	!
2338	!-- Send/receive agents to/from left/right neighbor
2339	CALL MPI_SENDRECV( ghra, ghra_count * agt_size, MPI_BYTE, &
2340	pright,1, &
2341	agt_gh_l, ghla_count_recv * agt_size, MPI_BYTE, &
2342	pleft, 1, &
2343	comm2d, status, ierr )
2344	!
2345	!-- If agents were received, add them to the respective ghost layer cells
2346	IF ( .NOT. ghra_empty_rcv ) THEN
2347	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_r)
2348	ENDIF
2349
2350	IF ( .NOT. ghla_empty_rcv ) THEN
2351	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_l)
2352	ENDIF
2353
2354	DEALLOCATE( ghla, ghra, agt_gh_l, agt_gh_r )
2355
2356	ENDIF
2357
2358	!
2359	!-- Transfer of agents from south to north and vice versa
2360	IF ( pdims(2) /= 1 ) THEN
2361	!
2362	!-- Reset south and north ghost layers
2363	ghsa_count = 0
2364	ghna_count = 0
2365	!
2366	!-- First calculate the storage necessary for sending
2367	!-- and receiving the data.
2368	ghsa_count = SUM(agt_count(nys:nys+2,nxlg:nxrg))
2369	ghna_count = SUM(agt_count(nyn-2:nyn,nxlg:nxrg))
2370	!
2371	!-- No cyclic boundaries for agents
2372	IF ( nys == 0 .OR. ghsa_count == 0 ) THEN
2373	ghsa_count = 1
2374	ELSE
2375	ghsa_empty = .FALSE.
2376	ENDIF
2377	IF ( nyn == ny .OR. ghna_count == 0 ) THEN
2378	ghna_count = 1
2379	ELSE
2380	ghna_empty = .FALSE.
2381	ENDIF
2382	ALLOCATE( ghsa(1:ghsa_count), ghna(1:ghna_count) )
2383	ghsa = zero_agent
2384	ghna = zero_agent
2385	!
2386	!-- Get all agents that will be sent south into one array
2387	ghsa_count = 0
2388	IF ( nys /= 0 ) THEN
2389	DO ip = nxlg, nxrg
2390	DO jp = nys, nys+2
2391
2392	number_of_agents = agt_count(jp,ip)
2393	IF ( number_of_agents <= 0 ) CYCLE
2394	ghsa(ghsa_count+1:ghsa_count+number_of_agents) &
2395	= grid_agents(jp,ip)%agents(1:number_of_agents)
2396	ghsa_count = ghsa_count + number_of_agents
2397
2398	ENDDO
2399	ENDDO
2400	ENDIF
2401	IF ( ghsa_count == 0 ) ghsa_count = 1
2402	!
2403	!-- Get all agents that will be sent north into one array
2404	ghna_count = 0
2405	IF ( nyn /= ny ) THEN
2406	DO ip = nxlg, nxrg
2407	DO jp = nyn-2, nyn
2408
2409	number_of_agents = agt_count(jp,ip)
2410	IF ( number_of_agents <= 0 ) CYCLE
2411	ghna(ghna_count+1:ghna_count+number_of_agents) &
2412	= grid_agents(jp,ip)%agents(1:number_of_agents)
2413	ghna_count = ghna_count + number_of_agents
2414
2415	ENDDO
2416	ENDDO
2417	ENDIF
2418	IF ( ghna_count == 0 ) ghna_count = 1
2419	!
2420	!-- Send/receive number of agents that
2421	!-- will be transferred to/from south/north neighbor
2422	CALL MPI_SENDRECV( ghsa_count, 1, MPI_INTEGER, psouth, 0, &
2423	ghna_count_recv, 1, MPI_INTEGER, pnorth, 0, &
2424	comm2d, status, ierr )
2425	ALLOCATE ( agt_gh_n(1:ghna_count_recv) )
2426	!
2427	!-- Send/receive number of agents that
2428	!-- will be transferred to/from north/south neighbor
2429	CALL MPI_SENDRECV( ghna_count, 1, MPI_INTEGER, pnorth, 0, &
2430	ghsa_count_recv, 1, MPI_INTEGER, psouth, 0, &
2431	comm2d, status, ierr )
2432	!
2433	!-- Send/receive flag that indicates if there are actually any agents
2434	!-- in ghost layer
2435	CALL MPI_SENDRECV( ghsa_empty, 1, MPI_LOGICAL, psouth, 1, &
2436	ghna_empty_rcv, 1, MPI_LOGICAL, pnorth, 1, &
2437	comm2d, status, ierr )
2438	CALL MPI_SENDRECV( ghna_empty, 1, MPI_LOGICAL, pnorth, 1, &
2439	ghsa_empty_rcv, 1, MPI_LOGICAL, psouth, 1, &
2440	comm2d, status, ierr )
2441
2442
2443	ALLOCATE ( agt_gh_s(1:ghsa_count_recv) )
2444	!
2445	!-- Get bit size of one agent
2446	agt_size = STORAGE_SIZE(zero_agent)/8
2447	!
2448	!-- Send/receive agents to/from south/north neighbor
2449	CALL MPI_SENDRECV( ghsa, ghsa_count * agt_size, MPI_BYTE, &
2450	psouth,1, &
2451	agt_gh_n, ghna_count_recv * agt_size, MPI_BYTE, &
2452	pnorth,1, &
2453	comm2d, status, ierr )
2454	!
2455	!-- Send/receive agents to/from south/north neighbor
2456	CALL MPI_SENDRECV( ghna, ghna_count * agt_size, MPI_BYTE, &
2457	pnorth,1, &
2458	agt_gh_s, ghsa_count_recv * agt_size, MPI_BYTE, &
2459	psouth,1, &
2460	comm2d, status, ierr )
2461	!
2462	!-- If agents were received, add them to the respective ghost layer cells
2463	IF ( .NOT. ghna_empty_rcv ) THEN
2464	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_n)
2465	ENDIF
2466
2467	IF ( .NOT. ghsa_empty_rcv ) THEN
2468	CALL mas_eh_add_ghost_agents_to_gridcell(agt_gh_s)
2469	ENDIF
2470
2471	DEALLOCATE( ghna, ghsa, agt_gh_n, agt_gh_s )
2472
2473	ENDIF
2474
2475	#endif
2476
2477	END SUBROUTINE mas_eh_ghost_exchange
2478
2479	!------------------------------------------------------------------------------!
2480	! Description:
2481	! ------------
2482	!> If an agent moves from one grid cell to another (on the current
2483	!> processor!), this subroutine moves the corresponding element from the
2484	!> agent array of the old grid cell to the agent array of the new grid
2485	!> cell.
2486	!------------------------------------------------------------------------------!
2487	SUBROUTINE mas_eh_move_agent
2488
2489	IMPLICIT NONE
2490
2491	INTEGER(iwp) :: i !< grid index (x) of agent position
2492	INTEGER(iwp) :: ip !< index variable along x
2493	INTEGER(iwp) :: j !< grid index (y) of agent position
2494	INTEGER(iwp) :: jp !< index variable along y
2495	INTEGER(iwp) :: n !< index variable for agent array
2496	INTEGER(iwp) :: na_before_move !< number of agents per grid box before moving
2497	INTEGER(iwp) :: aindex !< dummy argument for number of new agent per grid box
2498
2499	TYPE(agent_type), DIMENSION(:), POINTER :: agents_before_move !< agents before moving
2500
2501	CALL cpu_log( log_point_s(19), 'mas_eh_move_agent', 'start' )
2502
2503	DO ip = nxl, nxr
2504	DO jp = nys, nyn
2505
2506	na_before_move = agt_count(jp,ip)
2507	IF ( na_before_move <= 0 ) CYCLE
2508	agents_before_move => grid_agents(jp,ip)%agents(1:na_before_move)
2509
2510	DO n = 1, na_before_move
2511	i = agents_before_move(n)%x * ddx
2512	j = agents_before_move(n)%y * ddy
2513
2514	!-- For mas_eh_exchange_horiz to work properly agents need to be
2515	!-- moved to the outermost gridboxes of the respective processor.
2516	!-- If the agent index is inside the processor the following
2517	!-- lines will not change the index
2518	i = MIN ( i , nxr )
2519	i = MAX ( i , nxl )
2520	j = MIN ( j , nyn )
2521	j = MAX ( j , nys )
2522
2523	!
2524	!-- Check if agent has moved to another grid cell.
2525	IF ( i /= ip .OR. j /= jp ) THEN
2526	!
2527	!-- If the agent stays on the same processor, the agent
2528	!-- will be added to the agent array of the new processor.
2529	number_of_agents = agt_count(j,i)
2530	agents => grid_agents(j,i)%agents(1:number_of_agents)
2531
2532	aindex = number_of_agents+1
2533	IF ( aindex > SIZE(grid_agents(j,i)%agents) ) &
2534	THEN
2535	CALL mas_eh_realloc_agents_array(i,j)
2536	ENDIF
2537
2538	grid_agents(j,i)%agents(aindex) = agents_before_move(n)
2539	agt_count(j,i) = aindex
2540
2541	agents_before_move(n)%agent_mask = .FALSE.
2542	ENDIF
2543	ENDDO
2544
2545	ENDDO
2546	ENDDO
2547
2548	CALL cpu_log( log_point_s(19), 'mas_eh_move_agent', 'stop' )
2549
2550	RETURN
2551
2552	END SUBROUTINE mas_eh_move_agent
2553
2554	!------------------------------------------------------------------------------!
2555	! Description:
2556	! ------------
2557	!> If the allocated memory for the agent array do not suffice to add arriving
2558	!> agents from neighbour grid cells, this subrouting reallocates the
2559	!> agent array to assure enough memory is available.
2560	!------------------------------------------------------------------------------!
2561	SUBROUTINE mas_eh_realloc_agents_array (i,j,size_in)
2562
2563	IMPLICIT NONE
2564
2565	INTEGER(iwp) :: old_size !< old array size
2566	INTEGER(iwp) :: new_size !< new array size
2567
2568	INTEGER(iwp), INTENT(in) :: i !< grid index (y)
2569	INTEGER(iwp), INTENT(in) :: j !< grid index (y)
2570
2571	INTEGER(iwp), INTENT(in), OPTIONAL :: size_in !< size of input array
2572
2573	TYPE(agent_type), DIMENSION(10) :: tmp_agents_s !< temporary static agent array
2574
2575	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: tmp_agents_d !< temporary dynamic agent array
2576
2577	old_size = SIZE(grid_agents(j,i)%agents)
2578
2579	IF ( PRESENT(size_in) ) THEN
2580	new_size = size_in
2581	ELSE
2582	new_size = old_size * ( 1.0_wp + alloc_factor_mas / 100.0_wp )
2583	ENDIF
2584
2585	new_size = MAX( new_size, min_nr_agent, old_size + 1 )
2586
2587	IF ( old_size <= 10 ) THEN
2588
2589	tmp_agents_s(1:old_size) = grid_agents(j,i)%agents(1:old_size)
2590
2591	DEALLOCATE(grid_agents(j,i)%agents)
2592	ALLOCATE(grid_agents(j,i)%agents(new_size))
2593
2594	grid_agents(j,i)%agents(1:old_size) = tmp_agents_s(1:old_size)
2595	grid_agents(j,i)%agents(old_size+1:new_size) = zero_agent
2596
2597	ELSE
2598
2599	ALLOCATE(tmp_agents_d(new_size))
2600	tmp_agents_d(1:old_size) = grid_agents(j,i)%agents
2601
2602	DEALLOCATE(grid_agents(j,i)%agents)
2603	ALLOCATE(grid_agents(j,i)%agents(new_size))
2604
2605	grid_agents(j,i)%agents(1:old_size) = tmp_agents_d(1:old_size)
2606	grid_agents(j,i)%agents(old_size+1:new_size) = zero_agent
2607
2608	DEALLOCATE(tmp_agents_d)
2609
2610	ENDIF
2611	agents => grid_agents(j,i)%agents(1:number_of_agents)
2612
2613	RETURN
2614	END SUBROUTINE mas_eh_realloc_agents_array
2615
2616	!------------------------------------------------------------------------------!
2617	! Description:
2618	! ------------
2619	!> Inquires prognostic model quantities at the position of each agent and
2620	!> stores them in that agent for later output
2621	!------------------------------------------------------------------------------!
2622	SUBROUTINE mas_get_prognostic_quantities
2623
2624	USE arrays_3d, &
2625	ONLY: u, v, pt, hyp
2626
2627	USE chem_gasphase_mod, &
2628	ONLY: nvar
2629
2630	USE chemistry_model_mod, &
2631	ONLY: chem_species
2632
2633	USE control_parameters, &
2634	ONLY: air_chemistry
2635
2636	IMPLICIT NONE
2637
2638	INTEGER(iwp) :: i_offset !< index offset for windspeed measurement
2639	INTEGER(iwp) :: il !< x-index
2640	INTEGER(iwp) :: is !< subgrid box counter
2641	INTEGER(iwp) :: j_offset !< index offset for windspeed measurement
2642	INTEGER(iwp) :: jl !< y-index
2643	INTEGER(iwp) :: kl !< z-index
2644	INTEGER(iwp) :: nl !< agent counter
2645	INTEGER(iwp) :: se !< subgrid box end index
2646	INTEGER(iwp) :: si !< subgrid box start index
2647
2648	REAL(wp) :: u_a !< windspeed at agent position (x)
2649	REAL(wp) :: v_a !< windspeed at agent position (y)
2650	REAL(wp) :: x_a !< agent position (x)
2651	REAL(wp) :: y_a !< agent position (y)
2652
2653	DO il = nxl, nxr
2654	DO jl = nys, nyn
2655
2656	number_of_agents = agt_count(jl,il)
2657	!
2658	!-- If grid cell is empty, cycle
2659	IF ( number_of_agents <= 0 ) CYCLE
2660	kl = s_measure_height(jl,il)
2661
2662	agents => grid_agents(jl,il)%agents(1:number_of_agents)
2663	!
2664	!-- loop over the four subgrid boxes
2665	DO is = 0,3
2666	!
2667	!-- Set indices
2668	si = grid_agents(jl,il)%start_index(is)
2669	se = grid_agents(jl,il)%end_index(is)
2670	DO nl = si, se
2671	!
2672	!-- Calculate index offset in x-direction:
2673	!-- Left value if wall right of grid box
2674	!-- Right value if wall left of grid box
2675	!-- Else the one that is closer to the agent
2676	IF ( BTEST( obstacle_flags( jl, il+1 ), 6 ) ) THEN
2677	i_offset = 0
2678	ELSEIF ( BTEST( obstacle_flags( jl, il-1 ), 2 ) ) THEN
2679	i_offset = 1
2680	ELSE
2681	i_offset = MERGE( 0, 1, BTEST(is,1) )
2682	ENDIF
2683	u_a = u( kl, jl, il + i_offset )
2684	!
2685	!-- Calculate index offset in y-direction:
2686	!-- South value if wall north of grid box
2687	!-- North value if wall south of grid box
2688	!-- Else the one that is closer to the agent
2689	IF ( BTEST( obstacle_flags( jl+1, il ), 4 ) ) THEN
2690	j_offset = 0
2691	ELSEIF ( BTEST( obstacle_flags( jl-1, il ), 0 ) ) THEN
2692	j_offset = 1
2693	ELSE
2694	j_offset = MERGE( 0, 1, BTEST(is,0) )
2695	ENDIF
2696	v_a = v( kl, jl + j_offset, il )
2697	!
2698	!-- Calculate windspeed at agent postion
2699	agents(nl)%windspeed = SQRT(u_a2 + v_a2)
2700	!
2701	!-- Calculate temperature at agent position
2702	agents(nl)%t = pt(kl,jl,il) * &
2703	( hyp(kl) / 100000.0_wp )**0.286_wp
2704	! !
2705	! !-- Get PM10 concentration at agent position, if possible
2706	! IF ( ind_pm10 == -9 ) THEN
2707	! agents(nl)%pm10 = 0.0_wp
2708	! ELSE
2709	! agents(nl)%pm10 = chem_species(ind_pm10)%conc(kl,jl,il)
2710	! ENDIF
2711	! !
2712	! !-- Get PM10 concentration at agent position, if possible
2713	! IF ( ind_pm25 == -9 ) THEN
2714	! agents(nl)%pm25 = 0.0_wp
2715	! ELSE
2716	! agents(nl)%pm25 = chem_species(ind_pm25)%conc(kl,jl,il)
2717	! ENDIF
2718	ENDDO
2719
2720	ENDDO
2721
2722	ENDDO
2723	ENDDO
2724
2725	END SUBROUTINE mas_get_prognostic_quantities
2726
2727	!------------------------------------------------------------------------------!
2728	! Description:
2729	! ------------
2730	!> Adds an item to the priority queue (binary heap) at the correct position
2731	!------------------------------------------------------------------------------!
2732	SUBROUTINE mas_heap_insert_item( id, priority )
2733
2734	IMPLICIT NONE
2735
2736	INTEGER(iwp) :: cur_pos !< current position
2737	INTEGER(iwp) :: id !< mesh ID of item
2738
2739	REAL(wp) :: priority !< item priority
2740
2741	TYPE(heap_item) :: item !< heap item
2742
2743	item%mesh_id = id
2744	item%priority = priority
2745	!
2746	!-- Extend heap, if necessary
2747	IF ( heap_count + 1 > SIZE(queue) ) THEN
2748	CALL mas_heap_extend
2749	ENDIF
2750	!
2751	!-- Insert item at first unoccupied postion (highest index) of heap
2752	cur_pos = heap_count
2753	queue(cur_pos) = item
2754	!
2755	!-- Sort while inserted item is not at top of heap
2756	DO WHILE ( cur_pos /= 0 )
2757	!
2758	!-- If priority < its parent's priority, swap them.
2759	!-- Else, sorting is done.
2760	IF ( queue(cur_pos)%priority &
2761	< queue(FLOOR((cur_pos)/2.))%priority ) &
2762	THEN
2763	item = queue(cur_pos)
2764	queue(cur_pos) = queue(FLOOR((cur_pos)/2.))
2765	queue(FLOOR((cur_pos)/2.)) = item
2766	cur_pos = FLOOR((cur_pos)/2.)
2767	ELSE
2768	EXIT
2769	ENDIF
2770	ENDDO
2771	!
2772	!-- Item was added to heap, so the heap count increases
2773	heap_count = heap_count + 1
2774
2775	END SUBROUTINE mas_heap_insert_item
2776
2777	!------------------------------------------------------------------------------!
2778	! Description:
2779	! ------------
2780	!> Extends the size of the priority queue (binary heap)
2781	!------------------------------------------------------------------------------!
2782	SUBROUTINE mas_heap_extend
2783
2784	IMPLICIT NONE
2785
2786	INTEGER(iwp) :: soh !< size of heap
2787
2788	TYPE(heap_item), DIMENSION(:), ALLOCATABLE :: dummy_heap !< dummy heap
2789
2790	soh = SIZE(queue)-1
2791	ALLOCATE(dummy_heap(0:soh))
2792	dummy_heap = queue
2793	DEALLOCATE(queue)
2794	ALLOCATE(queue(0:2*soh+1))
2795	queue(0:soh) = dummy_heap(0:soh)
2796
2797	END SUBROUTINE mas_heap_extend
2798
2799	!------------------------------------------------------------------------------!
2800	! Description:
2801	! ------------
2802	!> Removes first (smallest) element from the priority queue, reorders the rest
2803	!> and returns the ID of the removed mesh point
2804	!------------------------------------------------------------------------------!
2805	SUBROUTINE mas_heap_extract_item ( id )
2806
2807	IMPLICIT NONE
2808
2809	INTEGER(iwp) :: id !< ID of item extracted item
2810	INTEGER(iwp) :: child !< child of item in heap
2811	INTEGER(iwp) :: cur_pos !< current position of item in heap
2812
2813	TYPE(heap_item) :: dummy
2814	!
2815	!-- Get ID of mesh point with lowest priority (extracted item: top of heap)
2816	id = queue(0)%mesh_id
2817	!
2818	!-- Put last item in heap at first position
2819	queue(0) = queue(heap_count-1)
2820	cur_pos = 0
2821	DO
2822	!
2823	!-- If current item has no children, sorting is done
2824	IF( 2*cur_pos+1 > heap_count - 1 ) THEN
2825	EXIT
2826	!
2827	!-- If current item has only one child, check if item and its child are
2828	!-- ordered correctly. Else, swap them.
2829	ELSEIF ( 2*cur_pos+2 > heap_count - 1 ) THEN
2830	IF ( queue(cur_pos)%priority > queue(2*cur_pos+1)%priority ) THEN
2831	dummy = queue(cur_pos)
2832	queue(cur_pos) = queue(2*cur_pos+1)
2833	queue(2*cur_pos+1) = dummy
2834	cur_pos = 2*cur_pos+1
2835	ELSE
2836	EXIT
2837	ENDIF
2838	ELSE
2839	!
2840	!-- determine the smaller child
2841	IF ( queue(2*cur_pos+1)%priority &
2842	>= queue(2*cur_pos+2)%priority ) &
2843	THEN
2844	child = 2
2845	ELSE
2846	child = 1
2847	ENDIF
2848	!
2849	!-- Check if item and its smaller child are ordered falsely. If so,
2850	!-- swap them. Else, sorting is done.
2851	IF ( queue(cur_pos)%priority > queue(2*cur_pos+child )%priority ) &
2852	THEN
2853	dummy = queue(cur_pos)
2854	queue(cur_pos) = queue(2*cur_pos+child)
2855	queue(2*cur_pos+child) = dummy
2856	cur_pos = 2*cur_pos+child
2857	ELSE
2858	EXIT
2859	ENDIF
2860	ENDIF
2861	ENDDO
2862	!
2863	!-- Top item was removed from heap, thus, heap_cout decreases by one
2864	heap_count = heap_count-1
2865
2866	END SUBROUTINE mas_heap_extract_item
2867
2868	!------------------------------------------------------------------------------!
2869	! Description:
2870	! ------------
2871	!> Initialization of Multi Agent System
2872	!------------------------------------------------------------------------------!
2873	SUBROUTINE mas_init
2874
2875	USE chem_gasphase_mod, &
2876	ONLY: nspec
2877
2878	USE chemistry_model_mod, &
2879	ONLY: chem_species
2880
2881	USE control_parameters, &
2882	ONLY: air_chemistry, coupling_char, initializing_actions, &
2883	io_blocks, io_group
2884
2885	USE surface_mod, &
2886	ONLY: get_topography_top_index, get_topography_top_index_ji
2887
2888	USE arrays_3d, &
2889	ONLY: zu, zw
2890
2891	USE indices, &
2892	ONLY: nzt
2893
2894	IMPLICIT NONE
2895
2896	INTEGER(iwp) :: i !< grid cell (x)
2897	INTEGER(iwp) :: ii !< io-block counter
2898	INTEGER(iwp) :: il !< io-block counter
2899	INTEGER(iwp) :: jl !< io-block counter
2900	INTEGER(iwp) :: kl !< io-block counter
2901	INTEGER(iwp) :: kdum !< io-block counter
2902	INTEGER(iwp) :: locdum !< io-block counter
2903	INTEGER(iwp) :: j !< grid cell (y)
2904	INTEGER(iwp) :: size_of_mesh !< temporary value for read
2905	INTEGER(iwp) :: size_of_pols !< temporary value for read
2906	INTEGER(iwp) :: ioerr !< IOSTAT flag for IO-commands ( 0 = no error )
2907
2908	REAL(wp) :: zdum !< dummy for measurement height
2909	REAL(wp) :: avg_agt_height = 1.8_wp
2910
2911	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: noc !< temp: number of connections in nav_mesh
2912
2913	!
2914	!-- Check the number of agent groups.
2915	IF ( number_of_agent_groups > max_number_of_agent_groups ) THEN
2916	WRITE( message_string, * ) 'max_number_of_agent_groups =', &
2917	max_number_of_agent_groups , &
2918	'&number_of_agent_groups reset to ', &
2919	max_number_of_agent_groups
2920	CALL message( 'mas_init', 'PA0072', 0, 1, 0, 6, 0 )
2921	number_of_agent_groups = max_number_of_agent_groups
2922	ENDIF
2923
2924	!
2925	!-- Set some parameters
2926	d_sigma_rep_agent = 1.0_wp/sigma_rep_agent
2927	d_sigma_rep_wall = 1.0_wp/sigma_rep_wall
2928	d_tau_accel_agent = 1.0_wp/tau_accel_agent
2929	IF ( dt_agent /= 999.0_wp ) THEN
2930	agent_own_timestep = .TRUE.
2931	ENDIF
2932
2933	!
2934	!-- Get index of first grid box above topography
2935	ALLOCATE( top_top_s(nysg:nyng,nxlg:nxrg), &
2936	top_top_w(nysg:nyng,nxlg:nxrg), &
2937	s_measure_height(nys:nyn,nxl:nxr) )
2938	!
2939	!-- Get first index above topography for scalar grid and last index in
2940	!-- topography for z-component of wind
2941	DO il = nxlg, nxrg
2942	DO jl = nysg, nyng
2943	top_top_s(jl,il) = get_topography_top_index_ji(jl,il,'s') + 1
2944	top_top_w(jl,il) = get_topography_top_index_ji(jl,il,'w')
2945	ENDDO
2946	ENDDO
2947	!
2948	!-- Create 2D array containing the index at which measurements are done by
2949	!-- agents. The height of this measurement is given by avg_agt_height.
2950	DO il = nxl, nxr
2951	DO jl = nys, nyn
2952
2953	kdum = top_top_w(jl,il)
2954	zdum = zw(kdum)
2955	zdum = zdum + avg_agt_height
2956	locdum = 0
2957	!
2958	!-- Locate minimum distance from u-grid to measurement height (zdum)
2959	DO kl = 1, nzt
2960	IF ( ABS(zu(kl)-zdum) < ABS(zu(locdum)-zdum) ) locdum = kl
2961	ENDDO
2962	s_measure_height(jl,il) = locdum
2963
2964	ENDDO
2965	ENDDO
2966	! !
2967	! !-- Get indices of PM10 and PM2.5 species, if active
2968	! IF ( air_chemistry ) THEN
2969	! DO il = 1, nspec
2970	! print*,chem_species(il)%name
2971	! ! IF ( spec_name(1:4) == 'PM10' ) THEN
2972	! ! ind_pm10 = il
2973	! ! ELSEIF ( spec_name(1:4) == 'PM25' ) THEN
2974	! ! ind_pm25 = il
2975	! ! ENDIF
2976	!
2977	! ENDDO
2978	! ENDIF
2979	! stop
2980	CALL mas_create_obstacle_flags
2981
2982	!
2983	!-- Set default start positions, if necessary
2984	IF ( asl(1) == 9999999.9_wp ) asl(1) = 0.0_wp
2985	IF ( asr(1) == 9999999.9_wp ) asr(1) = ( nx + 1 ) * dx
2986	IF ( ass(1) == 9999999.9_wp ) ass(1) = 0.0_wp
2987	IF ( asn(1) == 9999999.9_wp ) asn(1) = ( ny + 1 ) * dy
2988	IF ( adx(1) == 9999999.9_wp .OR. adx(1) == 0.0_wp ) adx(1) = dx
2989	IF ( ady(1) == 9999999.9_wp .OR. ady(1) == 0.0_wp ) ady(1) = dy
2990
2991	DO j = 2, number_of_agent_groups
2992	IF ( asl(j) == 9999999.9_wp ) asl(j) = asl(j-1)
2993	IF ( asr(j) == 9999999.9_wp ) asr(j) = asr(j-1)
2994	IF ( ass(j) == 9999999.9_wp ) ass(j) = ass(j-1)
2995	IF ( asn(j) == 9999999.9_wp ) asn(j) = asn(j-1)
2996	IF ( adx(j) == 9999999.9_wp .OR. adx(j) == 0.0_wp ) adx(j) = adx(j-1)
2997	IF ( ady(j) == 9999999.9_wp .OR. ady(j) == 0.0_wp ) ady(j) = ady(j-1)
2998	ENDDO
2999
3000	!
3001	!-- Check boundary condition and set internal variables
3002	SELECT CASE ( bc_mas_lr )
3003
3004	CASE ( 'cyclic' )
3005	ibc_mas_lr = 0
3006
3007	CASE ( 'absorb' )
3008	ibc_mas_lr = 1
3009
3010	CASE DEFAULT
3011	WRITE( message_string, * ) 'unknown boundary condition ', &
3012	'bc_mas_lr = "', TRIM( bc_mas_lr ), '"'
3013	CALL message( 'mas_init', 'PA0073', 1, 2, 0, 6, 0 )
3014
3015	END SELECT
3016	SELECT CASE ( bc_mas_ns )
3017
3018	CASE ( 'cyclic' )
3019	ibc_mas_ns = 0
3020
3021	CASE ( 'absorb' )
3022	ibc_mas_ns = 1
3023
3024	CASE DEFAULT
3025	WRITE( message_string, * ) 'unknown boundary condition ', &
3026	'bc_mas_ns = "', TRIM( bc_mas_ns ), '"'
3027	CALL message( 'mas_init', 'PA0074', 1, 2, 0, 6, 0 )
3028
3029	END SELECT
3030
3031	!
3032	!-- For the first model run of a possible job chain initialize the
3033	!-- agents, otherwise read the agent data from restart file.
3034	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
3035	.AND. read_agents_from_restartfile ) THEN
3036
3037	! CALL mas_read_restart_file
3038
3039	ELSE
3040	!
3041	!-- Read preprocessed data of navigation mesh and building polygons
3042	!-- for agent pathfinding
3043	DO ii = 0, io_blocks-1
3044	IF ( ii == io_group ) THEN
3045	OPEN ( 119, FILE='NAVIGATION_DATA'//TRIM( coupling_char ), &
3046	FORM='UNFORMATTED', IOSTAT=ioerr )
3047	!
3048	!-- Read mesh data
3049	READ(119) size_of_mesh
3050	ALLOCATE( mesh(1:size_of_mesh))
3051	DO i = 1, size_of_mesh
3052	READ(119) mesh(i)%polygon_id, mesh(i)%vertex_id, &
3053	mesh(i)%noc, mesh(i)%origin_id, &
3054	mesh(i)%cost_so_far, mesh(i)%x, &
3055	mesh(i)%y, mesh(i)%x_s, mesh(i)%y_s
3056	ALLOCATE( mesh(i)%connected_vertices(1:mesh(i)%noc), &
3057	mesh(i)%distance_to_vertex(1:mesh(i)%noc) )
3058	DO j = 1, mesh(i)%noc
3059	READ(119) mesh(i)%connected_vertices(j), &
3060	mesh(i)%distance_to_vertex(j)
3061	ENDDO
3062	ENDDO
3063	!
3064	!-- Read polygon data
3065	READ(119) size_of_pols
3066	ALLOCATE( polygons(1:size_of_pols) )
3067	DO i = 1, size_of_pols
3068	READ(119) polygons(i)%nov
3069	ALLOCATE( polygons(i)%vertices(0:polygons(i)%nov+1) )
3070	DO j = 0, polygons(i)%nov+1
3071	READ(119) polygons(i)%vertices(j)%delete, &
3072	polygons(i)%vertices(j)%x, &
3073	polygons(i)%vertices(j)%y
3074	ENDDO
3075	ENDDO
3076	CLOSE(119)
3077
3078	ENDIF
3079	#if defined( __parallel ) && ! defined ( __check )
3080	CALL MPI_BARRIER( comm2d, ierr )
3081	#endif
3082	ENDDO
3083
3084	!
3085	!-- Allocate agent arrays and set attributes of the initial set of
3086	!-- agents, which can be also periodically released at later times.
3087	ALLOCATE( agt_count (nysg:nyng,nxlg:nxrg), &
3088	grid_agents(nysg:nyng,nxlg:nxrg) )
3089	!
3090	!-- Allocate dummy arrays for pathfinding
3091	ALLOCATE( dummy_path_x(0:agt_path_size), &
3092	dummy_path_y(0:agt_path_size) )
3093
3094	number_of_agents = 0
3095	sort_count_mas = 0
3096	agt_count = 0
3097
3098	!
3099	!-- initialize counter for agent IDs
3100	grid_agents%id_counter = 1
3101
3102	!
3103	!-- Initialize all agents with dummy values (otherwise errors may
3104	!-- occur within restart runs). The reason for this is still not clear
3105	!-- and may be presumably caused by errors in the respective user-interface.
3106	zero_agent%agent_mask = .FALSE.
3107	zero_agent%block_nr = -1
3108	zero_agent%group = 0
3109	zero_agent%id = 0_idp
3110	zero_agent%path_counter = agt_path_size
3111	zero_agent%age = 0.0_wp
3112	zero_agent%age_m = 0.0_wp
3113	zero_agent%dt_sum = 0.0_wp
3114	zero_agent%clo = 0.0_wp
3115	zero_agent%energy_storage= 0.0_wp
3116	zero_agent%force_x = 0.0_wp
3117	zero_agent%force_y = 0.0_wp
3118	zero_agent%origin_x = 0.0_wp
3119	zero_agent%origin_y = 0.0_wp
3120	zero_agent%speed_abs = 0.0_wp
3121	zero_agent%speed_e_x = 0.0_wp
3122	zero_agent%speed_e_y = 0.0_wp
3123	zero_agent%speed_des = random_normal(desired_speed, des_sp_sig)
3124	zero_agent%speed_x = 0.0_wp
3125	zero_agent%speed_y = 0.0_wp
3126	zero_agent%thermal_index = 0.0_wp
3127	zero_agent%x = 0.0_wp
3128	zero_agent%y = 0.0_wp
3129	zero_agent%path_x = 0.0_wp
3130	zero_agent%path_y = 0.0_wp
3131	zero_agent%t_x = 0.0_wp
3132	zero_agent%t_y = 0.0_wp
3133
3134	!
3135	!-- Set a seed value for the random number generator to be exclusively
3136	!-- used for the agent code. The generated random numbers should be
3137	!-- different on the different PEs.
3138	iran_agent = iran_agent + myid
3139
3140	CALL mas_create_agent (PHASE_INIT)
3141
3142	ENDIF
3143
3144	!
3145	!-- To avoid programm abort, assign agents array to the local version of
3146	!-- first grid cell
3147	number_of_agents = agt_count(nys,nxl)
3148	agents => grid_agents(nys,nxl)%agents(1:number_of_agents)
3149
3150	END SUBROUTINE mas_init
3151
3152	!------------------------------------------------------------------------------!
3153	! Description:
3154	! ------------
3155	!> Finds the shortest path from a start position to a target position using the
3156	!> A*-algorithm
3157	!------------------------------------------------------------------------------!
3158	SUBROUTINE mas_nav_a_star( start_x, start_y, target_x, target_y, nsteps )
3159
3160	IMPLICIT NONE
3161
3162	LOGICAL :: target_reached !< flag
3163
3164	INTEGER(iwp) :: cur_node !< current node of binary heap
3165	INTEGER(iwp) :: i_ag !< agent index
3166	INTEGER(iwp) :: il !< counter (x)
3167	INTEGER(iwp) :: jl !< counter (y)
3168	INTEGER(iwp) :: neigh_node !< neighbor node
3169	INTEGER(iwp) :: node_counter !< binary heap node counter
3170	INTEGER(iwp) :: path_ag !< index of agent path
3171	INTEGER(iwp) :: som !< size of mesh
3172	INTEGER(iwp) :: rn_side !< index of agent path
3173	INTEGER(iwp) :: steps !< steps along the path
3174	INTEGER(iwp) :: nsteps !< number of steps
3175
3176	REAL(wp) :: start_x !< x-coordinate agent
3177	REAL(wp) :: start_y !< y-coordinate agent
3178	REAL(wp) :: new_cost !< updated cost to reach node
3179	REAL(wp) :: new_priority !< priority of node to be added to queue
3180	REAL(wp) :: rand_nr !< x-coordinate target
3181	REAL(wp) :: rn_gate !< random number for corner gate
3182	REAL(wp) :: target_x !< x-coordinate target
3183	REAL(wp) :: target_y !< y-coordinate target
3184	!
3185	!-- Coordinate Type
3186	TYPE coord
3187	REAL(wp) :: x !< x-coordinate
3188	REAL(wp) :: x_s !< x-coordinate (shifted)
3189	REAL(wp) :: y !< y-coordinate
3190	REAL(wp) :: y_s !< y-coordinate (shifted)
3191	END TYPE coord
3192
3193	TYPE(coord), DIMENSION(:), ALLOCATABLE, TARGET :: path !< path array
3194	TYPE(coord), DIMENSION(:), ALLOCATABLE, TARGET :: tmp_path !< temporary path for resizing
3195
3196	CALL cpu_log( log_point_s(20), 'mas_nav_find_path', 'start' )
3197	node_counter = 0
3198
3199	!
3200	!-- Create temporary navigation mesh including agent and target positions
3201	CALL mas_nav_create_tmp_mesh( start_x, start_y, target_x, target_y, som )
3202	tmp_mesh(som)%cost_so_far = 0.0_wp
3203	!
3204	!-- Initialize priority queue
3205	heap_count = 0_iwp
3206	ALLOCATE(queue(0:100))
3207	target_reached = .FALSE.
3208	!
3209	!-- Add starting point (agent position) to frontier (the frontier consists
3210	!-- of all the nodes that are to be visited. The node with the smallest
3211	!-- priority will be visited first. The priority consists of the distance
3212	!-- from the start node to this node plus a minimal guess (direct distance)
3213	!-- from this node to the goal). For the starting node, the priority is set
3214	!-- to 0, as it's the only node thus far
3215	CALL mas_heap_insert_item(som,0.0_wp)
3216	cur_node = som
3217	DO WHILE ( heap_count > 0 )
3218	!
3219	!-- Step one: Pick lowest priority item from queue
3220	node_counter = node_counter + 1
3221	CALL mas_heap_extract_item(cur_node)
3222	!
3223	!-- Node 0 is the goal node
3224	IF ( cur_node == 0 ) THEN
3225	EXIT
3226	ENDIF
3227	!
3228	!-- Loop over all of cur_node's neighbors
3229	DO il = 1, tmp_mesh(cur_node)%noc
3230	neigh_node = tmp_mesh(cur_node)%connected_vertices(il)
3231	!
3232	!-- Check, if the way from the start node to this neigh_node via
3233	!-- cur_node is shorter than the previously found shortest path to it.
3234	!-- If so, replace said cost and add neigh_node to the frontier.
3235	!-- cost_so_far is initialized as 1.d12 so that all found distances
3236	!-- should be smaller.
3237	new_cost = tmp_mesh(cur_node)%cost_so_far &
3238	+ tmp_mesh(cur_node)%distance_to_vertex(il)
3239	IF ( new_cost < tmp_mesh(neigh_node)%cost_so_far ) THEN
3240	tmp_mesh(neigh_node)%cost_so_far = new_cost
3241	tmp_mesh(neigh_node)%origin_id = cur_node
3242	!
3243	!-- Priority in the queue is cost_so_far + heuristic to goal
3244	new_priority = new_cost &
3245	+ heuristic(tmp_mesh(neigh_node)%x, &
3246	tmp_mesh(neigh_node)%y, tmp_mesh(0)%x, &
3247	tmp_mesh(0)%y)
3248	CALL mas_heap_insert_item(neigh_node,new_priority)
3249	ENDIF
3250	ENDDO
3251	ENDDO
3252	!
3253	!-- Add nodes to a path array. To do this, we must backtrack from the target
3254	!-- node to its origin to its origin and so on until an node is reached that
3255	!-- has no origin (%origin_id == -1). This is the starting node.
3256	DEALLOCATE(queue)
3257	cur_node = 0
3258	steps = 0
3259	ALLOCATE(path(1:100))
3260	DO WHILE ( cur_node /= -1 )
3261	steps = steps + 1
3262	!
3263	!-- Resize path array if necessary
3264	IF ( steps > SIZE(path) ) THEN
3265	ALLOCATE(tmp_path(1:steps-1))
3266	tmp_path(1:steps-1) = path(1:steps-1)
3267	DEALLOCATE(path)
3268	ALLOCATE(path(1:2*(steps-1)))
3269	path(1:steps-1) = tmp_path(1:steps-1)
3270	DEALLOCATE(tmp_path)
3271	ENDIF
3272	path(steps)%x = tmp_mesh(cur_node)%x
3273	path(steps)%y = tmp_mesh(cur_node)%y
3274	path(steps)%x_s = tmp_mesh(cur_node)%x_s
3275	path(steps)%y_s = tmp_mesh(cur_node)%y_s
3276	cur_node = tmp_mesh(cur_node)%origin_id
3277	ENDDO
3278	!
3279	!-- Add calculated intermittent targets to the path until either the
3280	!-- target or the maximum number of intermittent targets is reached.
3281	!-- Ignore starting point (reduce index by one), it is agent position.
3282	dummy_path_x = -1
3283	dummy_path_y = -1
3284	path_ag = 1
3285	steps = steps - 1
3286	nsteps = 0
3287	DO WHILE( steps > 0 .AND. path_ag <= agt_path_size )
3288	!
3289	!-- Each target point is randomly chosen along a line target along the
3290	!-- bisector of the building corner that starts at corner_gate_start
3291	!-- and has a width of corner_gate_width. This is to avoid clustering
3292	!-- when opposing agent groups try to reach the same corner target.
3293	rn_gate = random_function(iran_agent) * corner_gate_width &
3294	+ corner_gate_start
3295	dummy_path_x(path_ag) = path(steps)%x + rn_gate &
3296	* (path(steps)%x_s - path(steps)%x)
3297	dummy_path_y(path_ag) = path(steps)%y + rn_gate &
3298	* (path(steps)%y_s - path(steps)%y)
3299	steps = steps - 1
3300	path_ag = path_ag + 1
3301	nsteps = nsteps + 1
3302	ENDDO
3303	!
3304	!-- Set current intermittent target of this agent
3305	DEALLOCATE(tmp_mesh, path)
3306	CALL cpu_log( log_point_s(20), 'mas_nav_find_path', 'stop' )
3307
3308	END SUBROUTINE mas_nav_a_star
3309
3310	!------------------------------------------------------------------------------!
3311	! Description:
3312	! ------------
3313	!> Adds a connection between two points of the navigation mesh
3314	!> (one-way: in_mp1 to in_mp2)
3315	!------------------------------------------------------------------------------!
3316	SUBROUTINE mas_nav_add_connection ( in_mp1, id2, in_mp2 )
3317
3318	IMPLICIT NONE
3319
3320	LOGICAL :: connection_established !< Flag to indicate if connection has already been established
3321
3322	INTEGER(iwp) :: id2 !< ID of in_mp2
3323	INTEGER(iwp) :: il !< local counter
3324	INTEGER(iwp) :: noc1 !< number of connections in in_mp1
3325
3326	INTEGER, DIMENSION(:), ALLOCATABLE :: dum_cv !< dummy array for connected_vertices
3327
3328	REAL(wp) :: dist !< Distance between the two points
3329
3330	REAL(wp), DIMENSION(:), ALLOCATABLE :: dum_dtv
3331
3332	TYPE(mesh_point) :: in_mp1 !< mesh point that gets a new connection
3333	TYPE(mesh_point) :: in_mp2 !< mesh point in_mp1 will be connected to
3334
3335	connection_established = .FALSE.
3336	!
3337	!-- Check if connection has already been established
3338	noc1 = SIZE(in_mp1%connected_vertices)
3339	DO il = 1, in_mp1%noc
3340	IF ( in_mp1%connected_vertices(il) == id2 ) THEN
3341	connection_established = .TRUE.
3342	EXIT
3343	ENDIF
3344	ENDDO
3345
3346	IF ( .NOT. connection_established ) THEN
3347	!
3348	!-- Resize arrays, if necessary
3349	IF ( in_mp1%noc >= noc1 ) THEN
3350	ALLOCATE( dum_cv(1:noc1),dum_dtv(1:noc1) )
3351	dum_cv = in_mp1%connected_vertices
3352	dum_dtv = in_mp1%distance_to_vertex
3353	DEALLOCATE( in_mp1%connected_vertices, in_mp1%distance_to_vertex )
3354	ALLOCATE( in_mp1%connected_vertices(1:2*noc1), &
3355	in_mp1%distance_to_vertex(1:2*noc1) )
3356	in_mp1%connected_vertices = -999
3357	in_mp1%distance_to_vertex = -999.
3358	in_mp1%connected_vertices(1:noc1) = dum_cv
3359	in_mp1%distance_to_vertex(1:noc1) = dum_dtv
3360	ENDIF
3361
3362	!
3363	!-- Add connection
3364	in_mp1%noc = in_mp1%noc+1
3365	dist = SQRT( (in_mp1%x - in_mp2%x)2 + (in_mp1%y - in_mp2%y)2 )
3366	in_mp1%connected_vertices(in_mp1%noc) = id2
3367	in_mp1%distance_to_vertex(in_mp1%noc) = dist
3368	ENDIF
3369
3370	END SUBROUTINE mas_nav_add_connection
3371
3372	!------------------------------------------------------------------------------!
3373	! Description:
3374	! ------------
3375	!> Adds a vertex (curren position of agent or target) to the existing tmp_mesh
3376	!------------------------------------------------------------------------------!
3377	SUBROUTINE mas_nav_add_vertex_to_mesh ( in_mp, in_id )
3378
3379	IMPLICIT NONE
3380
3381	LOGICAL :: intersection_found !< flag
3382
3383	INTEGER(iwp) :: jl !< mesh point counter
3384	INTEGER(iwp) :: pl !< polygon counter
3385	INTEGER(iwp) :: vl !< vertex counter
3386	INTEGER(iwp) :: pid_t !< polygon id of tested mesh point
3387	INTEGER(iwp) :: vid_t !< vertex id of tested mesh point
3388	INTEGER(iwp) :: in_id !< vertex id of tested mesh point
3389
3390	REAL(wp) :: v1x !< x-coordinate of test vertex 1 for intersection test
3391	REAL(wp) :: v1y !< y-coordinate of test vertex 1 for intersection test
3392	REAL(wp) :: v2x !< x-coordinate of test vertex 2 for intersection test
3393	REAL(wp) :: v2y !< y-coordinate of test vertex 2 for intersection test
3394	REAL(wp) :: x !< x-coordinate of current mesh point
3395	REAL(wp) :: x_t !< x-coordinate of tested mesh point
3396	REAL(wp) :: y !< y-coordinate of current mesh point
3397	REAL(wp) :: y_t !< y-coordinate of tested mesh point
3398
3399	TYPE(mesh_point) :: in_mp !< Input mesh point
3400	!
3401	!--
3402	x = in_mp%x
3403	y = in_mp%y
3404	DO jl = 0, SIZE(tmp_mesh)-2
3405	IF ( in_id == jl ) CYCLE
3406	!
3407	!-- Ignore mesh points with 0 connections
3408	IF ( tmp_mesh(jl)%polygon_id /= -1 ) THEN
3409	IF ( tmp_mesh(jl)%noc == 0 ) CYCLE
3410	ENDIF
3411	x_t = tmp_mesh(jl)%x
3412	y_t = tmp_mesh(jl)%y
3413	pid_t = tmp_mesh(jl)%polygon_id
3414	vid_t = tmp_mesh(jl)%vertex_id
3415	!
3416	!-- If the connecting line between the target and a mesh point points
3417	!-- into the mesh point's polygon, no connection will be
3418	!-- established between the two points. This is the case if the
3419	!-- previous (next) vertex of the polygon is right of the connecting
3420	!-- line and the next (previous) vertex of the polygon is left of the
3421	!-- connecting line.
3422	IF ( pid_t > 0 .AND. pid_t <= SIZE(polygons) ) THEN
3423	IF ( (((is_left(x,y,x_t,y_t,polygons(pid_t)%vertices(vid_t-1)%x, &
3424	polygons(pid_t)%vertices(vid_t-1)%y) &
3425	.AND. is_right(x,y,x_t,y_t, &
3426	polygons(pid_t)%vertices(vid_t+1)%x, &
3427	polygons(pid_t)%vertices(vid_t+1)%y) ) &
3428	.OR. (is_right(x,y,x_t,y_t, &
3429	polygons(pid_t)%vertices(vid_t-1)%x, &
3430	polygons(pid_t)%vertices(vid_t-1)%y) &
3431	.AND. is_left(x,y,x_t,y_t, &
3432	polygons(pid_t)%vertices(vid_t+1)%x, &
3433	polygons(pid_t)%vertices(vid_t+1)%y)))))&
3434	THEN
3435	CYCLE
3436	ENDIF
3437	ENDIF
3438	!
3439	!-- For each edge of each polygon, check if it intersects with the
3440	!-- potential connection. If at least one intersection is found,
3441	!-- no connection can be made
3442	intersection_found = .FALSE.
3443	DO pl = 1, SIZE(polygons)
3444	DO vl = 1, polygons(pl)%nov
3445	v1x = polygons(pl)%vertices(vl)%x
3446	v1y = polygons(pl)%vertices(vl)%y
3447	v2x = polygons(pl)%vertices(vl+1)%x
3448	v2y = polygons(pl)%vertices(vl+1)%y
3449	intersection_found = intersect(x,y,x_t,y_t,v1x,v1y,v2x,v2y)
3450	IF ( intersection_found ) THEN
3451	EXIT
3452	ENDIF
3453	ENDDO
3454	IF ( intersection_found ) EXIT
3455	ENDDO
3456	IF ( intersection_found ) CYCLE
3457	!
3458	!-- If neither of the above two test was true, a connection will be
3459	!-- established between the two mesh points.
3460	CALL mas_nav_add_connection(in_mp,jl, tmp_mesh(jl))
3461	CALL mas_nav_add_connection(tmp_mesh(jl),in_id, in_mp)
3462	ENDDO
3463	CALL mas_nav_reduce_connections(in_mp)
3464
3465	END SUBROUTINE mas_nav_add_vertex_to_mesh
3466
3467	!------------------------------------------------------------------------------!
3468	! Description:
3469	! ------------
3470	!> Creates a temporary copy of the navigation mesh to be used for pathfinding
3471	!------------------------------------------------------------------------------!
3472	SUBROUTINE mas_nav_create_tmp_mesh( a_x, a_y, t_x, t_y, som )
3473
3474	IMPLICIT NONE
3475
3476	INTEGER(iwp) :: som !< size of mesh
3477	INTEGER(iwp) :: noc !< number of connetions
3478	INTEGER(iwp) :: im !< local mesh point counter
3479
3480	REAL(wp) :: a_x !< x-coordinate agent
3481	REAL(wp) :: a_y !< y-coordinate agent
3482	REAL(wp) :: t_x !< x-coordinate target
3483	REAL(wp) :: t_y !< y-coordinate target
3484	!
3485	!-- give tmp_mesh the size of mesh
3486	som = SIZE(mesh)+1
3487	ALLOCATE(tmp_mesh(0:som))
3488	!
3489	!-- give the allocatable variables in tmp_mesh their respctive sizes
3490	DO im = 1, som-1
3491	noc = mesh(im)%noc
3492	ALLOCATE(tmp_mesh(im)%connected_vertices(1:noc))
3493	ALLOCATE(tmp_mesh(im)%distance_to_vertex(1:noc))
3494	ENDDO
3495	!
3496	!-- copy mesh to tmp_mesh
3497	tmp_mesh(1:som-1) = mesh(1:som-1)
3498	!
3499	!-- Add target point ...
3500	CALL mas_nav_init_mesh_point(tmp_mesh(0),-1_iwp,-1_iwp,t_x, t_y)
3501	CALL mas_nav_add_vertex_to_mesh(tmp_mesh(0),0_iwp)
3502	!
3503	!-- ... and start point to temp mesh
3504	CALL mas_nav_init_mesh_point(tmp_mesh(som),-1_iwp,-1_iwp,a_x, a_y)
3505	CALL mas_nav_add_vertex_to_mesh(tmp_mesh(som),som)
3506
3507	END SUBROUTINE mas_nav_create_tmp_mesh
3508
3509
3510	!------------------------------------------------------------------------------!
3511	! Description:
3512	! ------------
3513	!> Finds the shortest path from an agents' position to her target. As the
3514	!> actual pathfinding algorithm uses the obstacle corners and then shifts them
3515	!> outward after pathfinding, cases can uccur in which the connection between
3516	!> these intermittent targets then intersect with obstacles. To remedy this
3517	!> the pathfinding algorithm is then run on every two subsequent intermittent
3518	!> targets iteratively and new intermittent targets may be added to the path
3519	!> this way.
3520	!------------------------------------------------------------------------------!
3521	SUBROUTINE mas_nav_find_path( nl )
3522
3523	IMPLICIT NONE
3524
3525	INTEGER(iwp) :: nl !< local agent counter
3526	INTEGER(iwp) :: il !< local counter
3527	INTEGER(iwp) :: jl !< local counter
3528	INTEGER(iwp) :: kl !< local counter
3529	INTEGER(iwp) :: nsteps_total !< number of steps on path
3530	INTEGER(iwp) :: nsteps_dummy !< number of steps on path
3531
3532	REAL(wp), DIMENSION(0:30) :: ld_path_x !< local dummy agent path to target (x)
3533	REAL(wp), DIMENSION(0:30) :: ld_path_y !< local dummy agent path to target (y)
3534	!
3535	!-- Initialize agent path arrays
3536	agents(nl)%path_x = -1
3537	agents(nl)%path_y = -1
3538	agents(nl)%path_x(0) = agents(nl)%x
3539	agents(nl)%path_y(0) = agents(nl)%y
3540	!
3541	!-- Calculate initial path
3542	CALL mas_nav_a_star( agents(nl)%x, agents(nl)%y, &
3543	agents(nl)%t_x, agents(nl)%t_y, nsteps_total )
3544	!
3545	!-- Set the rest of the agent path that was just calculated
3546	agents(nl)%path_x(1:nsteps_total) = dummy_path_x(1:nsteps_total)
3547	agents(nl)%path_y(1:nsteps_total) = dummy_path_y(1:nsteps_total)
3548	!
3549	!-- Iterate through found path and check more intermittent targets need
3550	!-- to be added. For this, run pathfinding between every two consecutive
3551	!-- intermittent targets.
3552	DO il = 0, MIN(agt_path_size-1, nsteps_total-1)
3553	!
3554	!-- pathfinding between two consecutive intermittent targets
3555	CALL mas_nav_a_star( agents(nl)%path_x(il), agents(nl)%path_y(il), &
3556	agents(nl)%path_x(il+1), agents(nl)%path_y(il+1),&
3557	nsteps_dummy )
3558	nsteps_dummy = nsteps_dummy - 1
3559	!
3560	!-- If additional intermittent targets are found, add them to the path
3561	IF ( nsteps_dummy > 0 ) THEN
3562	ld_path_x = -1
3563	ld_path_y = -1
3564	ld_path_x(il+1:il+nsteps_dummy) = dummy_path_x(1:nsteps_dummy)
3565	ld_path_y(il+1:il+nsteps_dummy) = dummy_path_y(1:nsteps_dummy)
3566	kl = 1
3567	DO jl = il+1,nsteps_total
3568	ld_path_x( il+nsteps_dummy+kl ) = agents(nl)%path_x(jl)
3569	ld_path_y( il+nsteps_dummy+kl ) = agents(nl)%path_y(jl)
3570	kl = kl + 1
3571	IF ( kl > agt_path_size ) EXIT
3572	ENDDO
3573	nsteps_total = MIN(nsteps_total + nsteps_dummy, agt_path_size)
3574	agents(nl)%path_x(il+1:nsteps_total) = ld_path_x(il+1:nsteps_total)
3575	agents(nl)%path_y(il+1:nsteps_total) = ld_path_y(il+1:nsteps_total)
3576	ENDIF
3577
3578	ENDDO
3579	!
3580	!-- reset path counter to first intermittent target
3581	agents(nl)%path_counter = 1
3582
3583	END SUBROUTINE mas_nav_find_path
3584
3585	!------------------------------------------------------------------------------!
3586	! Description:
3587	! ------------
3588	!> Reduces the size of connection array to the amount of actual connections
3589	!> after all connetions were added to a mesh point
3590	!------------------------------------------------------------------------------!
3591	SUBROUTINE mas_nav_reduce_connections ( in_mp )
3592
3593	IMPLICIT NONE
3594
3595	INTEGER(iwp) :: noc !< number of connections
3596
3597	INTEGER, DIMENSION(:), ALLOCATABLE :: dum_cv !< dummy connected_vertices
3598
3599	REAL(wp), DIMENSION(:), ALLOCATABLE :: dum_dtv !< dummy distance_to_vertex
3600
3601	TYPE(mesh_point) :: in_mp
3602
3603	noc = in_mp%noc
3604	ALLOCATE( dum_cv(1:noc),dum_dtv(1:noc) )
3605	dum_cv = in_mp%connected_vertices(1:noc)
3606	dum_dtv = in_mp%distance_to_vertex(1:noc)
3607	DEALLOCATE( in_mp%connected_vertices, in_mp%distance_to_vertex )
3608	ALLOCATE( in_mp%connected_vertices(1:noc), &
3609	in_mp%distance_to_vertex(1:noc) )
3610	in_mp%connected_vertices(1:noc) = dum_cv(1:noc)
3611	in_mp%distance_to_vertex(1:noc) = dum_dtv(1:noc)
3612
3613	END SUBROUTINE mas_nav_reduce_connections
3614
3615	!------------------------------------------------------------------------------!
3616	! Description:
3617	! ------------
3618	!> Initializes a point of the navigation mesh
3619	!------------------------------------------------------------------------------!
3620	SUBROUTINE mas_nav_init_mesh_point ( in_mp, pid, vid, x, y )
3621
3622	IMPLICIT NONE
3623
3624	INTEGER(iwp) :: pid !< polygon ID
3625	INTEGER(iwp) :: vid !< vertex ID
3626
3627	REAL(wp) :: x !< x-coordinate
3628	REAL(wp) :: y !< y-coordinate
3629
3630	TYPE(mesh_point) :: in_mp !< mesh point to be initialized
3631
3632	in_mp%origin_id = -1
3633	in_mp%polygon_id = pid
3634	in_mp%vertex_id = vid
3635	in_mp%cost_so_far = 1.d12
3636	in_mp%x = x
3637	in_mp%y = y
3638	in_mp%x_s = x
3639	in_mp%y_s = y
3640	ALLOCATE(in_mp%connected_vertices(1:100), &
3641	in_mp%distance_to_vertex(1:100))
3642	in_mp%connected_vertices = -999
3643	in_mp%distance_to_vertex = -999.
3644	in_mp%noc = 0
3645
3646	END SUBROUTINE mas_nav_init_mesh_point
3647
3648	!------------------------------------------------------------------------------!
3649	! Description:
3650	! ------------
3651	!> Reading of namlist from parin file
3652	!------------------------------------------------------------------------------!
3653	SUBROUTINE mas_parin
3654
3655	USE control_parameters, &
3656	ONLY: agent_time_unlimited, multi_agent_system_end, &
3657	multi_agent_system_start
3658
3659	IMPLICIT NONE
3660
3661	CHARACTER (LEN=80) :: line !<
3662
3663	NAMELIST /agent_parameters/ a_rand_target, &
3664	adx, &
3665	ady, &
3666	agent_maximum_age, &
3667	agent_time_unlimited, &
3668	alloc_factor_mas, &
3669	asl, &
3670	asn, &
3671	asr, &
3672	ass, &
3673	at_x, &
3674	at_y, &
3675	bc_mas_lr, &
3676	bc_mas_ns, &
3677	coll_t_0, &
3678	corner_gate_start, &
3679	corner_gate_width, &
3680	deallocate_memory_mas, &
3681	dist_to_int_target, &
3682	dt_agent, &
3683	dt_arel, &
3684	dt_write_agent_data, &
3685	end_time_arel, &
3686	max_dist_from_path, &
3687	min_nr_agent, &
3688	multi_agent_system_end, &
3689	multi_agent_system_start, &
3690	number_of_agent_groups, &
3691	radius_agent, &
3692	random_start_position_agents, &
3693	read_agents_from_restartfile, &
3694	repuls_agent, &
3695	repuls_wall, &
3696	scan_radius_agent, &
3697	sigma_rep_agent, &
3698	sigma_rep_wall, &
3699	step_dealloc_mas, &
3700	tau_accel_agent
3701
3702	!
3703	!-- Try to find agent package
3704	REWIND ( 11 )
3705	line = ' '
3706	DO WHILE ( INDEX( line, '&agent_parameters' ) == 0 )
3707	READ ( 11, '(A)', END=20 ) line
3708	ENDDO
3709	BACKSPACE ( 11 )
3710
3711	!
3712	!-- Read user-defined namelist
3713	READ ( 11, agent_parameters )
3714
3715	!
3716	!-- Set flag that indicates that agents are switched on
3717	agents_active = .TRUE.
3718
3719	20 CONTINUE
3720
3721	END SUBROUTINE mas_parin
3722
3723	!------------------------------------------------------------------------------!
3724	! Description:
3725	! ------------
3726	!> Routine for the whole processor
3727	!> Sort all agents into the 4 respective subgrid boxes
3728	!------------------------------------------------------------------------------!
3729	SUBROUTINE mas_ps_sort_in_subboxes
3730
3731	IMPLICIT NONE
3732
3733	INTEGER(iwp) :: i !< grid box (x)
3734	INTEGER(iwp) :: ip !< counter (x)
3735	INTEGER(iwp) :: is !< box counter
3736	INTEGER(iwp) :: j !< grid box (y)
3737	INTEGER(iwp) :: jp !< counter (y)
3738	INTEGER(iwp) :: m !< sorting index
3739	INTEGER(iwp) :: n !< agent index
3740	INTEGER(iwp) :: nn !< agent counter
3741	INTEGER(iwp) :: sort_index !< sorting index
3742
3743	INTEGER(iwp), DIMENSION(0:3) :: sort_count !< number of agents in one subbox
3744
3745	TYPE(agent_type), DIMENSION(:,:), ALLOCATABLE :: sort_agents !< sorted agent array
3746
3747	CALL cpu_log( log_point_s(21), 'mas_ps_sort_in_subboxes', 'start' )
3748	DO ip = nxl, nxr
3749	DO jp = nys, nyn
3750	number_of_agents = agt_count(jp,ip)
3751	IF ( number_of_agents <= 0 ) CYCLE
3752	agents => grid_agents(jp,ip)%agents(1:number_of_agents)
3753
3754	nn = 0
3755	sort_count = 0
3756	ALLOCATE( sort_agents(number_of_agents, 0:3) )
3757
3758	DO n = 1, number_of_agents
3759	sort_index = 0
3760
3761	IF ( agents(n)%agent_mask ) THEN
3762	nn = nn + 1
3763	!
3764	!-- Sorting agents with a binary scheme
3765	!-- sort_index=11_2=3_10 -> agent at the left,south subgridbox
3766	!-- sort_index=10_2=2_10 -> agent at the left,north subgridbox
3767	!-- sort_index=01_2=1_10 -> agent at the right,south subgridbox
3768	!-- sort_index=00_2=0_10 -> agent at the right,north subgridbox
3769	!-- For this the center of the gridbox is calculated
3770	i = (agents(n)%x + 0.5_wp * dx) * ddx
3771	j = (agents(n)%y + 0.5_wp * dy) * ddy
3772
3773	IF ( i == ip ) sort_index = sort_index + 2
3774	IF ( j == jp ) sort_index = sort_index + 1
3775
3776	sort_count(sort_index) = sort_count(sort_index) + 1
3777	m = sort_count(sort_index)
3778	sort_agents(m,sort_index) = agents(n)
3779	sort_agents(m,sort_index)%block_nr = sort_index
3780	ENDIF
3781	ENDDO
3782
3783	nn = 0
3784	DO is = 0,3
3785	grid_agents(jp,ip)%start_index(is) = nn + 1
3786	DO n = 1,sort_count(is)
3787	nn = nn + 1
3788	agents(nn) = sort_agents(n,is)
3789	ENDDO
3790	grid_agents(jp,ip)%end_index(is) = nn
3791	ENDDO
3792
3793	number_of_agents = nn
3794	agt_count(jp,ip) = number_of_agents
3795	DEALLOCATE(sort_agents)
3796	ENDDO
3797	ENDDO
3798	CALL cpu_log( log_point_s(21), 'mas_ps_sort_in_subboxes', 'stop' )
3799
3800	END SUBROUTINE mas_ps_sort_in_subboxes
3801
3802	!------------------------------------------------------------------------------!
3803	! Description:
3804	! ------------
3805	!> Move all agents not marked for deletion to lowest indices (packing)
3806	!------------------------------------------------------------------------------!
3807	SUBROUTINE mas_ps_pack
3808
3809	IMPLICIT NONE
3810
3811	INTEGER(iwp) :: n !< agent counter
3812	INTEGER(iwp) :: nn !< number of agents
3813	!
3814	!-- Find out elements marked for deletion and move data from highest index
3815	!-- values to these free indices
3816	nn = number_of_agents
3817
3818	DO WHILE ( .NOT. agents(nn)%agent_mask )
3819	nn = nn-1
3820	IF ( nn == 0 ) EXIT
3821	ENDDO
3822
3823	IF ( nn > 0 ) THEN
3824	DO n = 1, number_of_agents
3825	IF ( .NOT. agents(n)%agent_mask ) THEN
3826	agents(n) = agents(nn)
3827	nn = nn - 1
3828	DO WHILE ( .NOT. agents(nn)%agent_mask )
3829	nn = nn-1
3830	IF ( n == nn ) EXIT
3831	ENDDO
3832	ENDIF
3833	IF ( n == nn ) EXIT
3834	ENDDO
3835	ENDIF
3836
3837	!
3838	!-- The number of deleted agents has been determined in routines
3839	!-- mas_boundary_conds, mas_droplet_collision, and mas_eh_exchange_horiz
3840	number_of_agents = nn
3841
3842	END SUBROUTINE mas_ps_pack
3843
3844	!------------------------------------------------------------------------------!
3845	! Description:
3846	! ------------
3847	!> Sort agents in each sub-grid box into two groups: agents that already
3848	!> completed the LES timestep, and agents that need further timestepping to
3849	!> complete the LES timestep.
3850	!------------------------------------------------------------------------------!
3851	SUBROUTINE mas_ps_sort_timeloop_done
3852
3853	IMPLICIT NONE
3854
3855	INTEGER(iwp) :: end_index !< agent end index for each sub-box
3856	INTEGER(iwp) :: i !< index of agent grid box in x-direction
3857	INTEGER(iwp) :: j !< index of agent grid box in y-direction
3858	INTEGER(iwp) :: n !< running index for number of agents
3859	INTEGER(iwp) :: nb !< index of subgrid boux
3860	INTEGER(iwp) :: nf !< indices for agents in each sub-box that already finalized their substeps
3861	INTEGER(iwp) :: nnf !< indices for agents in each sub-box that need further treatment
3862	INTEGER(iwp) :: num_finalized !< number of agents in each sub-box that already finalized their substeps
3863	INTEGER(iwp) :: start_index !< agent start index for each sub-box
3864
3865	TYPE(agent_type), DIMENSION(:), ALLOCATABLE :: sort_agents !< temporary agent array
3866
3867	DO i = nxl, nxr
3868	DO j = nys, nyn
3869
3870	number_of_agents = agt_count(j,i)
3871	IF ( number_of_agents <= 0 ) CYCLE
3872
3873	agents => grid_agents(j,i)%agents(1:number_of_agents)
3874
3875	DO nb = 0, 3
3876	!
3877	!-- Obtain start and end index for each subgrid box
3878	start_index = grid_agents(j,i)%start_index(nb)
3879	end_index = grid_agents(j,i)%end_index(nb)
3880	!
3881	!-- Allocate temporary array used for sorting
3882	ALLOCATE( sort_agents(start_index:end_index) )
3883	!
3884	!-- Determine number of agents already completed the LES
3885	!-- timestep, and write them into a temporary array
3886	nf = start_index
3887	num_finalized = 0
3888	DO n = start_index, end_index
3889	IF ( dt_3d - agents(n)%dt_sum < 1E-8_wp ) THEN
3890	sort_agents(nf) = agents(n)
3891	nf = nf + 1
3892	num_finalized = num_finalized + 1
3893	ENDIF
3894	ENDDO
3895	!
3896	!-- Determine number of agents that not completed the LES
3897	!-- timestep, and write them into a temporary array
3898	nnf = nf
3899	DO n = start_index, end_index
3900	IF ( dt_3d - agents(n)%dt_sum > 1E-8_wp ) THEN
3901	sort_agents(nnf) = agents(n)
3902	nnf = nnf + 1
3903	ENDIF
3904	ENDDO
3905	!
3906	!-- Write back sorted agents
3907	agents(start_index:end_index) = &
3908	sort_agents(start_index:end_index)
3909	!
3910	!-- Determine updated start_index, used to masked already
3911	!-- completed agents.
3912	grid_agents(j,i)%start_index(nb) = &
3913	grid_agents(j,i)%start_index(nb) &
3914	+ num_finalized
3915	!
3916	!-- Deallocate dummy array
3917	DEALLOCATE ( sort_agents )
3918	!
3919	!-- Finally, if number of non-completed agents is non zero
3920	!-- in any of the sub-boxes, set control flag appropriately.
3921	IF ( nnf > nf ) &
3922	grid_agents(j,i)%time_loop_done = .FALSE.
3923
3924	ENDDO
3925	ENDDO
3926	ENDDO
3927
3928	END SUBROUTINE mas_ps_sort_timeloop_done
3929
3930	!------------------------------------------------------------------------------!
3931	! Description:
3932	! ------------
3933	!> Calls social forces calculations
3934	!------------------------------------------------------------------------------!
3935	SUBROUTINE mas_timestep_forces_call ( ip, jp )
3936
3937	IMPLICIT NONE
3938
3939	INTEGER(iwp) :: ip !< counter, x-direction
3940	INTEGER(iwp) :: jp !< counter, y-direction
3941	INTEGER(iwp) :: n !< loop variable over all agents in a grid box
3942
3943	!
3944	!-- Get direction for all agents in current grid cell
3945	CALL mas_agent_direction
3946
3947	CALL cpu_log( log_point_s(9), 'mas_transport', 'continue' )
3948	DO n = 1, number_of_agents
3949
3950	force_x = 0.0_wp
3951	force_y = 0.0_wp
3952
3953	CALL mas_timestep_social_forces ( 'acceleration', n, ip, jp )
3954
3955	CALL mas_timestep_social_forces ( 'other_agents', n, ip, jp )
3956
3957	CALL mas_timestep_social_forces ( 'walls', n, ip, jp )
3958	!
3959	!-- Update forces
3960	agents(n)%force_x = force_x
3961	agents(n)%force_y = force_y
3962	ENDDO
3963
3964	CALL cpu_log( log_point_s(9), 'mas_transport', 'pause' )
3965
3966
3967	END SUBROUTINE mas_timestep_forces_call
3968
3969	!------------------------------------------------------------------------------!
3970	! Description:
3971	! ------------
3972	!> Euler timestep of agent transport
3973	!------------------------------------------------------------------------------!
3974	SUBROUTINE mas_timestep
3975
3976	IMPLICIT NONE
3977
3978	INTEGER(iwp) :: n !< loop variable over all agents in a grid box
3979
3980	REAL(wp) :: abs_v !< absolute value of velocity
3981	REAL(wp) :: abs_f !< absolute value of force
3982
3983	CALL cpu_log( log_point_s(9), 'mas_transport', 'continue' )
3984
3985	DO n = 1, number_of_agents
3986	!
3987	!-- Limit absolute force to a maximum to prevent unrealistic acceleration
3988	abs_f = SQRT((agents(n)%force_x)2 + (agents(n)%force_y)2)
3989	IF ( abs_f > 20. ) THEN
3990	agents(n)%force_x = agents(n)%force_x * 20. / abs_f
3991	agents(n)%force_y = agents(n)%force_y * 20. / abs_f
3992	ENDIF
3993	!
3994	!-- Update agent speed
3995	agents(n)%speed_x = agents(n)%speed_x + agents(n)%force_x * dt_agent
3996	agents(n)%speed_y = agents(n)%speed_y + agents(n)%force_y * dt_agent
3997	!
3998	!-- Reduction of agent speed to maximum agent speed
3999	abs_v = SQRT((agents(n)%speed_x)2 + (agents(n)%speed_y)2)
4000	IF ( abs_v > v_max_agent ) THEN
4001	agents(n)%speed_x = agents(n)%speed_x * v_max_agent / abs_v
4002	agents(n)%speed_y = agents(n)%speed_y * v_max_agent / abs_v
4003	ENDIF
4004	!
4005	!-- Update agent position
4006	agents(n)%x = agents(n)%x + agents(n)%speed_x * dt_agent
4007	agents(n)%y = agents(n)%y + agents(n)%speed_y * dt_agent
4008	!
4009	!-- Update absolute value of agent speed
4010	agents(n)%speed_abs = abs_v
4011	!
4012	!-- Increment the agent age and the total time that the agent
4013	!-- has advanced within the agent timestep procedure
4014	agents(n)%age_m = agents(n)%age
4015	agents(n)%age = agents(n)%age + dt_agent
4016	agents(n)%dt_sum = agents(n)%dt_sum + dt_agent
4017	!
4018	!-- Check whether there is still an agent that has not yet completed
4019	!-- the total LES timestep
4020	IF ( ( dt_3d - agents(n)%dt_sum ) > 1E-8_wp ) THEN
4021	dt_3d_reached_l_mas = .FALSE.
4022	ENDIF
4023
4024	ENDDO
4025
4026	CALL cpu_log( log_point_s(9), 'mas_transport', 'pause' )
4027
4028
4029	END SUBROUTINE mas_timestep
4030
4031	!------------------------------------------------------------------------------!
4032	! Description:
4033	! ------------
4034	!> Calculates the Social Forces (Helbing and Molnar, 1995) that the agent
4035	!> experiences due to acceleration towards target and repulsion by obstacles
4036	!------------------------------------------------------------------------------!
4037	SUBROUTINE mas_timestep_social_forces ( mode, nl, ip, jp )
4038
4039	USE constants, &
4040	ONLY: pi
4041
4042	IMPLICIT NONE
4043
4044	CHARACTER (LEN=*) :: mode !< identifier for the mode of calculation
4045
4046	INTEGER(iwp) :: ij_dum !< index of nearest wall
4047	INTEGER(iwp) :: il !< index variable along x
4048	INTEGER(iwp) :: ip !< index variable along x
4049	INTEGER(iwp) :: jl !< index variable along y
4050	INTEGER(iwp) :: jp !< index variable along y
4051	INTEGER(iwp) :: nl !< loop variable over all agents in a grid box
4052	INTEGER(iwp) :: no !< loop variable over all agents in a grid box
4053	INTEGER(iwp) :: noa !< amount of agents in a grid box
4054	INTEGER(iwp) :: sc_x_end !< index for scan for topography/other agents
4055	INTEGER(iwp) :: sc_x_start !< index for scan for topography/other agents
4056	INTEGER(iwp) :: sc_y_end !< index for scan for topography/other agents
4057	INTEGER(iwp) :: sc_y_start !< index for scan for topography/other agents
4058
4059	LOGICAL :: corner_found !< flag that indicates a corner has been found near agent
4060
4061	REAL(wp) :: a_pl !< factor for collision avoidance
4062	REAL(wp) :: ax_semimaj !< semiminor axis of repulsive ellipse
4063	REAL(wp) :: b_pl !< factor for collision avoidance
4064	REAL(wp) :: c_pl !< factor for collision avoidance
4065	REAL(wp) :: coll_t !< time at which the next collision would happen
4066	REAL(wp) :: d_coll_t_0 !< inverse of collision cutoff time
4067	REAL(wp) :: d_pl !< factor for collision avoidance
4068	REAL(wp) :: ddum_f !< dummy devisor collision avoidance
4069	REAL(wp) :: dist !< distance to obstacle
4070	REAL(wp) :: dist_sq !< distance to obstacle squared
4071	REAL(wp) :: dummy_coll_time !< dummy for collision time
4072	REAL(wp) :: pos_rel_x !< relative position of two agents (x)
4073	REAL(wp) :: pos_rel_y !< relative position of two agents (y)
4074	REAL(wp) :: r_sq !< y-position
4075	REAL(wp) :: sra !< scan radius (agents)
4076	REAL(wp) :: srw !< local variable for scan radius (walls)
4077	REAL(wp) :: v_rel_x !< relative velocity (x); collision avoidance
4078	REAL(wp) :: v_rel_y !< relative velocity (y); collision avoidance
4079	REAL(wp) :: x_a !< x-position
4080	REAL(wp) :: x_wall !< x-position of wall
4081	REAL(wp) :: y_a !< y-position
4082	REAL(wp) :: y_wall !< y-position of wall
4083
4084	REAL(wp), PARAMETER :: k_pl = 1.5 !< factor for collision avoidance
4085
4086	TYPE(agent_type), DIMENSION(:), POINTER :: l_agts !< agents that repulse current agent
4087
4088	!
4089	!-- Initialization
4090	x_a = agents(nl)%x
4091	y_a = agents(nl)%y
4092
4093	SELECT CASE ( TRIM( mode ) )
4094	!
4095	!-- Calculation of force due to agent trying to approach desired velocity
4096	CASE ( 'acceleration' )
4097
4098	force_x = force_x + d_tau_accel_agent &
4099	* ( agents(nl)%speed_des*agents(nl)%speed_e_x &
4100	-agents(nl)%speed_x )
4101
4102	force_y = force_y + d_tau_accel_agent &
4103	* ( agents(nl)%speed_des*agents(nl)%speed_e_y &
4104	-agents(nl)%speed_y )
4105
4106	!
4107	!-- Calculation of repulsive forces by other agents in a radius around the
4108	!-- current one
4109	CASE ( 'other_agents' )
4110	CALL cpu_log( log_point_s(16), 'mas_other_agents', 'continue' )
4111
4112	sra = scan_radius_agent
4113	d_coll_t_0 = 1./coll_t_0
4114	!
4115	!-- Find relevant gridboxes (those that could contain agents within
4116	!-- scan radius)
4117	sc_x_start = FLOOR( (x_a - sra) * ddx )
4118	sc_x_end = FLOOR( (x_a + sra) * ddx )
4119	sc_y_start = FLOOR( (y_a - sra) * ddx )
4120	sc_y_end = FLOOR( (y_a + sra) * ddx )
4121	IF ( sc_x_start < nxlg ) sc_x_start = nxlg
4122	IF ( sc_x_end > nxrg ) sc_x_end = nxrg
4123	IF ( sc_y_start < nysg ) sc_y_start = nysg
4124	IF ( sc_y_end > nyng ) sc_y_end = nyng
4125
4126	sra = sra**2
4127	!
4128	!-- Loop over all previously found relevant gridboxes
4129	DO il = sc_x_start, sc_x_end
4130	DO jl = sc_y_start, sc_y_end
4131	noa = agt_count(jl,il)
4132	IF ( noa <= 0 ) CYCLE
4133	l_agts => grid_agents(jl,il)%agents(1:noa)
4134	DO no = 1, noa
4135	!
4136	!-- Skip self
4137	IF ( jl == jp .AND. il == ip .AND. no == nl ) CYCLE
4138	pos_rel_x = l_agts(no)%x - x_a
4139	pos_rel_y = l_agts(no)%y - y_a
4140	dist_sq = pos_rel_x2 + pos_rel_y2
4141	IF ( dist_sq > sra ) CYCLE
4142	r_sq = (2radius_agent)*2
4143	v_rel_x = agents(nl)%speed_x - l_agts(no)%speed_x
4144	v_rel_y = agents(nl)%speed_y - l_agts(no)%speed_y
4145	!
4146	!-- Collision is already occuring, default to standard
4147	!-- social forces
4148	IF ( dist_sq <= r_sq ) THEN
4149	dist = SQRT(dist_sq) + 1.0d-12
4150	ax_semimaj = .5_wp*SQRT( dist )
4151
4152	force_x = force_x - 0.125_wp * repuls_agent &
4153	* d_sigma_rep_agent / ax_semimaj &
4154	* EXP( -ax_semimaj*d_sigma_rep_agent ) &
4155	* (pos_rel_x/dist)
4156
4157	force_y = force_y - 0.125_wp * repuls_agent &
4158	* d_sigma_rep_agent / ax_semimaj &
4159	* EXP( -ax_semimaj*d_sigma_rep_agent ) &
4160	* (pos_rel_y/dist)
4161	!
4162	!-- Currently no collision, calculate collision avoidance
4163	!-- force according to Karamouzas et al (2014, PRL 113,238701)
4164	ELSE
4165	!
4166	!-- factors
4167	a_pl = v_rel_x2 + v_rel_y2
4168	b_pl = pos_rel_xv_rel_x + pos_rel_yv_rel_y
4169	c_pl = dist_sq - r_sq
4170	d_pl = b_pl*2 - a_plc_pl
4171	!
4172	!-- If the two agents are moving non-parallel, calculate
4173	!-- collision avoidance social force
4174	IF ( d_pl > 0.0_wp .AND. &
4175	( a_pl < -0.00001 .OR. a_pl > 0.00001 ) ) &
4176	THEN
4177
4178	d_pl = SQRT(d_pl)
4179	coll_t = (b_pl - d_pl)/a_pl
4180	IF ( coll_t > 0.0_wp ) THEN
4181	!
4182	!-- Dummy factor
4183	ddum_f = 1. / ( a_pl * coll_t**2 ) &
4184	* ( 2. / coll_t + 1.0 * d_coll_t_0 )
4185	!
4186	!-- x-component of social force
4187	force_x = force_x - k_pl * &
4188	EXP( -coll_t * d_coll_t_0 ) * &
4189	( v_rel_x - &
4190	( b_pl * v_rel_x - &
4191	a_pl * pos_rel_x ) / d_pl ) * &
4192	ddum_f
4193	!
4194	!-- y-component of social force
4195	force_y = force_y - k_pl * &
4196	EXP( -coll_t * d_coll_t_0 ) * &
4197	( v_rel_y - &
4198	( b_pl * v_rel_y - &
4199	a_pl * pos_rel_y ) / d_pl ) * &
4200	ddum_f
4201
4202	ENDIF
4203	ENDIF
4204	ENDIF
4205	ENDDO
4206	ENDDO
4207	ENDDO
4208	CALL cpu_log( log_point_s(16), 'mas_other_agents', 'pause' )
4209
4210	CASE ( 'walls' )
4211
4212	srw = scan_radius_wall
4213	corner_found = .FALSE.
4214	!
4215	!-- find relevant grid boxes (those that could contain topography
4216	!-- within radius)
4217	sc_x_start = (x_a - srw) * ddx
4218	sc_x_end = (x_a + srw) * ddx
4219	sc_y_start = (y_a - srw) * ddx
4220	sc_y_end = (y_a + srw) * ddx
4221	IF ( sc_x_start < nxlg ) sc_x_start = nxlg
4222	IF ( sc_x_end > nxrg ) sc_x_end = nxrg
4223	IF ( sc_y_start < nysg ) sc_y_start = nysg
4224	IF ( sc_y_end > nyng ) sc_y_end = nyng
4225	!
4226	!-- Find "walls" ( i.e. topography steps (up or down) higher than one
4227	!-- grid box ) that are perpendicular to the agent within the defined
4228	!-- search radius. Such obstacles cannot be passed and a social force
4229	!-- to that effect is applied.
4230	!-- Walls only apply a force perpendicular to the wall to the agent.
4231	!-- There is therefore a search for walls directly right, left, south
4232	!-- and north of the agent. All other walls are ignored.
4233	!--
4234	!-- Check for wall left of current agent
4235	ij_dum = 0
4236	IF ( sc_x_start < ip ) THEN
4237	DO il = ip - 1, sc_x_start, -1
4238	!
4239	!-- Going left from the agent, check for a right wall
4240	IF ( BTEST( obstacle_flags(jp,il), 2 ) ) THEN
4241	!
4242	!-- obstacle found in grid box il, wall at right side
4243	x_wall = (il+1)*dx
4244	!
4245	!-- Calculate force of found wall on agent
4246	CALL mas_timestep_wall_corner_force ( nl, x_a, x_wall, &
4247	y_a, y_a )
4248	!
4249	!-- calculate new x starting index for later scan for corners
4250	ij_dum = il + 1
4251	EXIT
4252	ENDIF
4253	ENDDO
4254	ENDIF
4255	IF ( ij_dum /= 0 ) sc_x_start = ij_dum
4256
4257	!
4258	!-- Check for wall right of current agent
4259	ij_dum = 0
4260	IF ( sc_x_end > ip ) THEN
4261	DO il = ip + 1, sc_x_end
4262	!
4263	!-- Going right from the agent, check for a left wall
4264	IF ( BTEST( obstacle_flags(jp,il), 6 ) ) THEN
4265	!
4266	!-- obstacle found in grid box il, wall at left side
4267	x_wall = il*dx
4268	!
4269	!-- Calculate force of found wall on agent
4270	CALL mas_timestep_wall_corner_force ( nl, x_a, x_wall, &
4271	y_a, y_a )
4272	!
4273	!-- calculate new x end index for later scan for corners
4274	ij_dum = il - 1
4275	EXIT
4276	ENDIF
4277	ENDDO
4278	ENDIF
4279	IF ( ij_dum /= 0 ) sc_x_end = ij_dum
4280
4281	!
4282	!-- Check for wall south of current agent
4283	ij_dum = 0
4284	IF ( sc_y_start < jp ) THEN
4285	DO jl = jp - 1, sc_y_start, -1
4286	!
4287	!-- Going south from the agent, check for a north wall
4288	IF ( BTEST( obstacle_flags(jl,ip), 0 ) ) THEN
4289	!
4290	!-- obstacle found in grid box jl, wall at left side
4291	y_wall = (jl+1)*dy
4292
4293	CALL mas_timestep_wall_corner_force ( nl, x_a, x_a, y_a, &
4294	y_wall )
4295	!
4296	!-- calculate new y starting index for later scan for corners
4297	ij_dum = jl + 1
4298	EXIT
4299	ENDIF
4300	ENDDO
4301	ENDIF
4302	IF ( ij_dum /= 0 ) sc_y_start = ij_dum
4303
4304	!
4305	!-- Check for wall north of current agent
4306	ij_dum = 0
4307	IF ( sc_y_end > jp ) THEN
4308	DO jl = jp + 1, sc_y_end
4309	!
4310	!-- Going north from the agent, check for a south wall
4311	IF ( BTEST( obstacle_flags(jl,ip), 4 ) ) THEN
4312	!
4313	!-- obstacle found in grid box jl, wall at left side
4314	y_wall = jl*dy
4315
4316	CALL mas_timestep_wall_corner_force ( nl, x_a, x_a, y_a, &
4317	y_wall )
4318	!
4319	!-- calculate new y end index for later scan for corners
4320	ij_dum = jl - 1
4321	ENDIF
4322	ENDDO
4323	ENDIF
4324	IF ( ij_dum /= 0 ) sc_y_end = ij_dum
4325
4326	!
4327	!-- Scan for corners surrounding current agent.
4328	!-- Only gridcells that are closer than the closest wall in each
4329	!-- direction (n,s,r,l) are considered in the search since those
4330	!-- further away would have a significantly smaller resulting force
4331	!-- than the closer wall.
4332	DO il = sc_x_start, sc_x_end
4333	DO jl = sc_y_start, sc_y_end
4334	IF ( il == ip .OR. jl == jp ) CYCLE
4335	!
4336	!-- corners left of agent
4337	IF ( il < ip ) THEN
4338	!
4339	!-- south left quadrant: look for north right corner
4340	IF ( jl < jp ) THEN
4341	IF ( BTEST( obstacle_flags(jl,il), 1 ) ) THEN
4342	!
4343	!-- calculate coordinates of the found corner
4344	x_wall = (il+1)*dx
4345	y_wall = (jl+1)*dy
4346
4347	CALL mas_timestep_wall_corner_force ( nl, x_a, &
4348	x_wall, y_a, y_wall )
4349
4350	ENDIF
4351	!
4352	!-- north left quadrant: look for south right corner
4353	ELSEIF ( jl > jp ) THEN
4354	IF ( BTEST( obstacle_flags(jl,il), 3 ) ) THEN
4355	!
4356	!-- calculate coordinates of the corner of said gridcell
4357	!-- that is closest to the current agent
4358	x_wall = (il+1)*dx
4359	y_wall = jl*dy
4360
4361	CALL mas_timestep_wall_corner_force ( nl, x_a, &
4362	x_wall, y_a, y_wall )
4363
4364	ENDIF
4365	ENDIF
4366	ELSEIF ( il > ip ) THEN
4367	!
4368	!-- south right quadrant: look for north left corner
4369	IF ( jl < jp ) THEN
4370	IF ( BTEST( obstacle_flags(jl,il), 7 ) ) THEN
4371	!
4372	!-- calculate coordinates of the corner of said gridcell
4373	!-- that is closest to the current agent
4374	x_wall = il*dx
4375	y_wall = (jl+1)*dy
4376
4377	CALL mas_timestep_wall_corner_force ( nl, x_a, &
4378	x_wall, y_a, y_wall )
4379
4380	ENDIF
4381	!
4382	!-- north right quadrant: look for south left corner
4383	ELSEIF ( jl > jp ) THEN
4384	IF ( BTEST( obstacle_flags(jl,il), 5 ) ) THEN
4385	!
4386	!-- calculate coordinates of the corner of said gridcell
4387	!-- that is closest to the current agent
4388	x_wall = il*dx
4389	y_wall = jl*dy
4390
4391	CALL mas_timestep_wall_corner_force ( nl, x_a, &
4392	x_wall, y_a, y_wall )
4393
4394	ENDIF
4395	ENDIF
4396	ENDIF
4397	ENDDO
4398	ENDDO
4399
4400	CASE DEFAULT
4401
4402	END SELECT
4403
4404	END SUBROUTINE mas_timestep_social_forces
4405
4406	!------------------------------------------------------------------------------!
4407	! Description:
4408	! ------------
4409	!> Given a distance to the current agent, calculates the force a found corner
4410	!> or wall exerts on that agent
4411	!------------------------------------------------------------------------------!
4412	SUBROUTINE mas_timestep_wall_corner_force ( nl, xa, xw, ya, yw )
4413
4414	IMPLICIT NONE
4415
4416	INTEGER(iwp) :: nl !< loop variable over all agents in a grid box
4417
4418	REAL(wp) :: dist_l !< distance to obstacle
4419	REAL(wp) :: force_d_x !< increment of social force, x-direction
4420	REAL(wp) :: force_d_y !< increment of social force, x-direction
4421	REAL(wp) :: xa !< x-position of agent
4422	REAL(wp) :: xw !< x-position of wall
4423	REAL(wp) :: ya !< x-position of agent
4424	REAL(wp) :: yw !< y-position of wall
4425
4426	force_d_x = 0.0_wp
4427	force_d_y = 0.0_wp
4428	!
4429	!-- calculate coordinates of corner relative to agent
4430	!-- postion and distance between corner and agent
4431	xw = xa - xw
4432	yw = ya - yw
4433	dist_l = SQRT( (xw)2 + (yw)2 )
4434	!
4435	!-- calculate x and y component of repulsive force
4436	!-- induced by previously found corner
4437	IF ( dist_l > 0 ) THEN
4438	force_d_x = repuls_wall * d_sigma_rep_wall &
4439	* EXP( -dist_l * d_sigma_rep_wall ) &
4440	* xw / (dist_l)
4441	force_d_y = repuls_wall * d_sigma_rep_wall &
4442	* EXP( -dist_l * d_sigma_rep_wall ) &
4443	* yw / (dist_l)
4444	ENDIF
4445
4446	! !-- forces that are located outside of a sight radius of
4447	! !-- 200Â° (-> COS(100./180.pi) = COS(.555pi)) of
4448	! !-- current agent are considered to have an effect of 50%
4449	! IF ( force_d_x * agents(nl)%speed_e_x + &
4450	! force_d_y * agents(nl)%speed_e_y < &
4451	! SQRT(force_d_x2 + force_d_y2) * &
4452	! COS( .55555555 * 3.1415 ) ) &
4453	! THEN
4454	! force_d_x = force_d_x * .5_wp
4455	! force_d_y = force_d_y * .5_wp
4456	! ENDIF
4457
4458	!
4459	!-- add force increment to total force of current agent
4460	force_x = force_x + force_d_x
4461	force_y = force_y + force_d_y
4462
4463	END SUBROUTINE mas_timestep_wall_corner_force
4464
4465	!
4466	!-- Calculates distance of point P to edge (A,B). If A = B, calculates
4467	!-- point-to-point distance from A/B to P
4468	FUNCTION dist_point_to_edge ( a_x, a_y, b_x, b_y, p_x, p_y )
4469
4470	IMPLICIT NONE
4471
4472	REAL(wp) :: ab_x !< x-coordinate of vector from A to B
4473	REAL(wp) :: ab_y !< y-coordinate of vector from A to B
4474	REAL(wp) :: ab_d !< inverse length of vector from A to B
4475	REAL(wp) :: ab_u_x !< x-coordinate of vector with direction of ab and length 1
4476	REAL(wp) :: ab_u_y !< y-coordinate of vector with direction of ab and length 1
4477	REAL(wp) :: ba_x !< x-coordinate of vector from B to A
4478	REAL(wp) :: ba_y !< y-coordinate of vector from B to A
4479	REAL(wp) :: ap_x !< x-coordinate of vector from A to P
4480	REAL(wp) :: ap_y !< y-coordinate of vector from A to P
4481	REAL(wp) :: bp_x !< x-coordinate of vector from B to P
4482	REAL(wp) :: bp_y !< y-coordinate of vector from B to P
4483	REAL(wp) :: a_x !< x-coordinate of point A of edge
4484	REAL(wp) :: a_y !< y-coordinate of point A of edge
4485	REAL(wp) :: b_x !< x-coordinate of point B of edge
4486	REAL(wp) :: b_y !< y-coordinate of point B of edge
4487	REAL(wp) :: p_x !< x-coordinate of point P
4488	REAL(wp) :: p_y !< y-coordinate of point P
4489	REAL(wp) :: dist_x !< x-coordinate of point P
4490	REAL(wp) :: dist_y !< y-coordinate of point P
4491	REAL(wp) :: dist_point_to_edge !< y-coordinate of point P
4492
4493	ab_x = - a_x + b_x
4494	ab_y = - a_y + b_y
4495	ba_x = - b_x + a_x
4496	ba_y = - b_y + a_y
4497	ap_x = - a_x + p_x
4498	ap_y = - a_y + p_y
4499	bp_x = - b_x + p_x
4500	bp_y = - b_y + p_y
4501
4502	IF ( ab_x * ap_x + ab_y * ap_y <= 0. ) THEN
4503	dist_point_to_edge = SQRT((a_x - p_x)2 + (a_y - p_y)2)
4504	ELSEIF ( ba_x * bp_x + ba_y * bp_y <= 0. ) THEN
4505	dist_point_to_edge = SQRT((b_x - p_x)2 + (b_y - p_y)2)
4506	ELSE
4507	ab_d = 1./SQRT((ab_x)2+(ab_y)2)
4508	ab_u_x = ab_x*ab_d
4509	ab_u_y = ab_y*ab_d
4510	dist_x = ap_x - (ap_xab_u_x+ap_yab_u_y)*ab_u_x
4511	dist_y = ap_y - (ap_xab_u_x+ap_yab_u_y)*ab_u_y
4512	dist_point_to_edge = SQRT( dist_x2 + dist_y2 )
4513	ENDIF
4514
4515	END FUNCTION dist_point_to_edge
4516
4517	!
4518	!-- Returns the heuristic between points A and B (currently the straight
4519	!-- distance)
4520	FUNCTION heuristic ( ax, ay, bx, by )
4521
4522	IMPLICIT NONE
4523
4524	REAL(wp) :: ax !< x-coordinate of point A
4525	REAL(wp) :: ay !< y-coordinate of point A
4526	REAL(wp) :: bx !< x-coordinate of point B
4527	REAL(wp) :: by !< y-coordinate of point B
4528	REAL(wp) :: heuristic !< return value
4529
4530	heuristic = SQRT(( ax - bx )2 + ( ay - by )2)
4531
4532	END FUNCTION heuristic
4533
4534	!
4535	!-- Calculates if point P is left of the infinite
4536	!-- line that contains A and B (direction: A to B)
4537	!-- Concept: 2D rotation of two vectors
4538	FUNCTION is_left ( ax, ay, bx, by, px, py )
4539
4540	IMPLICIT NONE
4541
4542	LOGICAL :: is_left !< return value; TRUE if P is left of AB
4543
4544	REAL(wp) :: ax !< x-coordinate of point A
4545	REAL(wp) :: ay !< y-coordinate of point A
4546	REAL(wp) :: bx !< x-coordinate of point B
4547	REAL(wp) :: by !< y-coordinate of point B
4548	REAL(wp) :: px !< x-coordinate of point P
4549	REAL(wp) :: py !< y-coordinate of point P
4550
4551	is_left = (bx-ax)(py-ay)-(px-ax)(by-ay) > 0
4552	IF ( (ABS(ax-px) < .001 .AND. ABS(ay-py) < .001) .OR. &
4553	(ABS(bx-px) < .001 .AND. ABS(by-py) < .001) ) &
4554	THEN
4555	is_left = .FALSE.
4556	ENDIF
4557
4558	RETURN
4559
4560	END FUNCTION is_left
4561
4562	!
4563	!-- Calculates if point P is right of the infinite
4564	!-- line that contains A and B (direction: A to B)
4565	!-- Concept: 2D rotation of two vectors
4566	FUNCTION is_right ( ax, ay, bx, by, px, py )
4567
4568	IMPLICIT NONE
4569
4570	LOGICAL :: is_right !< return value; TRUE if P is right of AB
4571
4572	REAL(wp), INTENT(IN) :: ax !< x-coordinate of point A
4573	REAL(wp), INTENT(IN) :: ay !< y-coordinate of point A
4574	REAL(wp), INTENT(IN) :: bx !< x-coordinate of point B
4575	REAL(wp), INTENT(IN) :: by !< y-coordinate of point B
4576	REAL(wp), INTENT(IN) :: px !< x-coordinate of point P
4577	REAL(wp), INTENT(IN) :: py !< y-coordinate of point P
4578
4579	is_right = (bx-ax)(py-ay)-(px-ax)(by-ay) < 0
4580	IF ( (ABS(ax-px) < .001 .AND. ABS(ay-py) < .001) .OR. &
4581	(ABS(bx-px) < .001 .AND. ABS(by-py) < .001) ) &
4582	THEN
4583	is_right = .FALSE.
4584	ENDIF
4585
4586	RETURN
4587
4588	END FUNCTION is_right
4589
4590	!
4591	!-- Returns true if the line segments AB and PQ share an intersection
4592	FUNCTION intersect ( ax, ay, bx, by, px, py, qx, qy )
4593
4594	IMPLICIT NONE
4595
4596	LOGICAL :: intersect !< return value; TRUE if intersection was found
4597	LOGICAL :: la !< T if a is left of PQ
4598	LOGICAL :: lb !< T if b is left of PQ
4599	LOGICAL :: lp !< T if p is left of AB
4600	LOGICAL :: lq !< T if q is left of AB
4601	LOGICAL :: poss !< flag that indicates if an intersection is still possible
4602	LOGICAL :: ra !< T if a is right of PQ
4603	LOGICAL :: rb !< T if b is right of PQ
4604	LOGICAL :: rp !< T if p is right of AB
4605	LOGICAL :: rq !< T if q is right of AB
4606
4607	REAL(wp) :: ax !< x-coordinate of point A
4608	REAL(wp) :: ay !< y-coordinate of point A
4609	REAL(wp) :: bx !< x-coordinate of point B
4610	REAL(wp) :: by !< y-coordinate of point B
4611	REAL(wp) :: px !< x-coordinate of point P
4612	REAL(wp) :: py !< y-coordinate of point P
4613	REAL(wp) :: qx !< x-coordinate of point Q
4614	REAL(wp) :: qy !< y-coordinate of point Q
4615
4616	intersect = .FALSE.
4617	poss = .FALSE.
4618	!
4619	!-- Intersection is possible only if P and Q are on opposing sides of AB
4620	lp = is_left(ax,ay,bx,by,px,py)
4621	rq = is_right(ax,ay,bx,by,qx,qy)
4622	IF ( lp .AND. rq ) poss = .TRUE.
4623	IF ( .NOT. poss ) THEN
4624	lq = is_left(ax,ay,bx,by,qx,qy)
4625	rp = is_right(ax,ay,bx,by,px,py)
4626	IF ( lq .AND. rp ) poss = .TRUE.
4627	ENDIF
4628	!
4629	!-- Intersection occurs only if above test (poss) was true AND
4630	!-- A and B are on opposing sides of PQ
4631	IF ( poss ) THEN
4632	la = is_left(px,py,qx,qy,ax,ay)
4633	rb = is_right(px,py,qx,qy,bx,by)
4634	IF ( la .AND. rb ) intersect = .TRUE.
4635	IF ( .NOT. intersect ) THEN
4636	lb = is_left(px,py,qx,qy,bx,by)
4637	ra = is_right(px,py,qx,qy,ax,ay)
4638	IF ( lb .AND. ra ) intersect = .TRUE.
4639	ENDIF
4640	ENDIF
4641
4642	RETURN
4643
4644	END FUNCTION intersect
4645
4646	!
4647	!-- Gives a nuber randomly distributed around an average
4648	FUNCTION random_normal ( avg, variation )
4649
4650	IMPLICIT NONE
4651
4652	REAL(wp) :: avg !< x-coordinate of vector from A to B
4653	REAL(wp) :: variation !< y-coordinate of vector from A to B
4654	REAL(wp) :: random_normal !< y-coordinate of vector from A to B
4655
4656	REAL(wp), DIMENSION(12) :: random_arr !< inverse length of vector from A to B
4657
4658	CALL RANDOM_NUMBER(random_arr)
4659	random_normal = avg + variation*(SUM(random_arr)-6.)
4660
4661	END FUNCTION random_normal
4662
4663
4664	END MODULE multi_agent_system_mod

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