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source: palm/trunk/SOURCE/lpm_init_mod.f90 @ 1859

Last change on this file since 1859 was 1851, checked in by maronga, 9 years ago
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1	!> @file lpm_init_mod.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2016 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! -----------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: lpm_init_mod.f90 1851 2016-04-08 13:32:50Z hoffmann $
26	!
27	! 1850 2016-04-08 13:29:27Z maronga
28	! Module renamed
29	!
30	!
31	! 1831 2016-04-07 13:15:51Z hoffmann
32	! curvature_solution_effects moved to particle_attributes
33	!
34	! 1822 2016-04-07 07:49:42Z hoffmann
35	! Unused variables removed.
36	!
37	! 1783 2016-03-06 18:36:17Z raasch
38	! netcdf module added
39	!
40	! 1725 2015-11-17 13:01:51Z hoffmann
41	! Bugfix: Processor-dependent seed for random function is generated before it is
42	! used.
43	!
44	! 1691 2015-10-26 16:17:44Z maronga
45	! Renamed prandtl_layer to constant_flux_layer.
46	!
47	! 1685 2015-10-08 07:32:13Z raasch
48	! bugfix concerning vertical index offset in case of ocean
49	!
50	! 1682 2015-10-07 23:56:08Z knoop
51	! Code annotations made doxygen readable
52	!
53	! 1575 2015-03-27 09:56:27Z raasch
54	! initial vertical particle position is allowed to follow the topography
55	!
56	! 1359 2014-04-11 17:15:14Z hoffmann
57	! New particle structure integrated.
58	! Kind definition added to all floating point numbers.
59	! lpm_init changed form a subroutine to a module.
60	!
61	! 1327 2014-03-21 11:00:16Z raasch
62	! -netcdf_output
63	!
64	! 1322 2014-03-20 16:38:49Z raasch
65	! REAL functions provided with KIND-attribute
66	!
67	! 1320 2014-03-20 08:40:49Z raasch
68	! ONLY-attribute added to USE-statements,
69	! kind-parameters added to all INTEGER and REAL declaration statements,
70	! kinds are defined in new module kinds,
71	! revision history before 2012 removed,
72	! comment fields (!:) to be used for variable explanations added to
73	! all variable declaration statements
74	! bugfix: #if defined( __parallel ) added
75	!
76	! 1314 2014-03-14 18:25:17Z suehring
77	! Vertical logarithmic interpolation of horizontal particle speed for particles
78	! between roughness height and first vertical grid level.
79	!
80	! 1092 2013-02-02 11:24:22Z raasch
81	! unused variables removed
82	!
83	! 1036 2012-10-22 13:43:42Z raasch
84	! code put under GPL (PALM 3.9)
85	!
86	! 849 2012-03-15 10:35:09Z raasch
87	! routine renamed: init_particles -> lpm_init
88	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
89	! advec_particles),
90	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
91	!
92	! 828 2012-02-21 12:00:36Z raasch
93	! call of init_kernels, particle feature color renamed class
94	!
95	! 824 2012-02-17 09:09:57Z raasch
96	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
97	! array particles implemented as pointer
98	!
99	! 667 2010-12-23 12:06:00Z suehring/gryschka
100	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
101	! of arrays.
102	!
103	! Revision 1.1 1999/11/25 16:22:38 raasch
104	! Initial revision
105	!
106	!
107	! Description:
108	! ------------
109	!> This routine initializes a set of particles and their attributes (position,
110	!> radius, ..) which are used by the Lagrangian particle model (see lpm).
111	!------------------------------------------------------------------------------!
112	MODULE lpm_init_mod
113
114
115	USE arrays_3d, &
116	ONLY: de_dx, de_dy, de_dz, zu, zw, z0
117
118	USE control_parameters, &
119	ONLY: cloud_droplets, constant_flux_layer, current_timestep_number, &
120	dz, initializing_actions, message_string, ocean, simulated_time
121
122	USE grid_variables, &
123	ONLY: ddx, dx, ddy, dy
124
125	USE indices, &
126	ONLY: nx, nxl, nxlg, nxrg, nxr, ny, nyn, nys, nyng, nysg, nz, nzb, &
127	nzb_w_inner, nzt
128
129	USE kinds
130
131	USE lpm_collision_kernels_mod, &
132	ONLY: init_kernels
133
134	USE netcdf_interface, &
135	ONLY: netcdf_data_format
136
137	USE particle_attributes, &
138	ONLY: alloc_factor, bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
139	block_offset, block_offset_def, collision_kernel, &
140	curvature_solution_effects, &
141	density_ratio, grid_particles, &
142	initial_weighting_factor, ibc_par_b, ibc_par_lr, ibc_par_ns, &
143	ibc_par_t, iran_part, log_z_z0, &
144	max_number_of_particle_groups, maximum_number_of_particles, &
145	min_nr_particle, mpi_particle_type, &
146	number_of_particles, &
147	number_of_particle_groups, number_of_sublayers, &
148	offset_ocean_nzt, offset_ocean_nzt_m1, &
149	particles, particle_advection_start, particle_groups, &
150	particle_groups_type, particles_per_point, &
151	particle_type, pdx, pdy, pdz, &
152	prt_count, psb, psl, psn, psr, pss, pst, &
153	radius, random_start_position, read_particles_from_restartfile,&
154	seed_follows_topography, sort_count, &
155	total_number_of_particles, &
156	use_sgs_for_particles, &
157	write_particle_statistics, uniform_particles, zero_particle, &
158	z0_av_global
159
160	USE pegrid
161
162	USE random_function_mod, &
163	ONLY: random_function
164
165	IMPLICIT NONE
166
167	PRIVATE
168
169	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !<
170	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !<
171
172	INTERFACE lpm_init
173	MODULE PROCEDURE lpm_init
174	END INTERFACE lpm_init
175
176	INTERFACE lpm_create_particle
177	MODULE PROCEDURE lpm_create_particle
178	END INTERFACE lpm_create_particle
179
180	PUBLIC lpm_init, lpm_create_particle
181
182	CONTAINS
183
184	!------------------------------------------------------------------------------!
185	! Description:
186	! ------------
187	!> @todo Missing subroutine description.
188	!------------------------------------------------------------------------------!
189	SUBROUTINE lpm_init
190
191	USE lpm_collision_kernels_mod, &
192	ONLY: init_kernels
193
194	IMPLICIT NONE
195
196	INTEGER(iwp) :: i !<
197	INTEGER(iwp) :: j !<
198	INTEGER(iwp) :: k !<
199
200	#if defined( __parallel )
201	INTEGER(iwp), DIMENSION(3) :: blocklengths !<
202	INTEGER(iwp), DIMENSION(3) :: displacements !<
203	INTEGER(iwp), DIMENSION(3) :: types !<
204	#endif
205
206	REAL(wp) :: height_int !<
207	REAL(wp) :: height_p !<
208	REAL(wp) :: z_p !<
209	REAL(wp) :: z0_av_local !<
210
211	#if defined( __parallel )
212	!
213	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
214	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
215	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
216	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
217
218	types(1) = MPI_REAL
219	types(2) = MPI_INTEGER
220	types(3) = MPI_UB
221	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
222	mpi_particle_type, ierr )
223	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
224	#endif
225
226	!
227	!-- In case of oceans runs, the vertical index calculations need an offset,
228	!-- because otherwise the k indices will become negative
229	IF ( ocean ) THEN
230	offset_ocean_nzt = nzt
231	offset_ocean_nzt_m1 = nzt - 1
232	ENDIF
233
234	!
235	!-- Define block offsets for dividing a gridcell in 8 sub cells
236
237	block_offset(0) = block_offset_def (-1,-1,-1)
238	block_offset(1) = block_offset_def (-1,-1, 0)
239	block_offset(2) = block_offset_def (-1, 0,-1)
240	block_offset(3) = block_offset_def (-1, 0, 0)
241	block_offset(4) = block_offset_def ( 0,-1,-1)
242	block_offset(5) = block_offset_def ( 0,-1, 0)
243	block_offset(6) = block_offset_def ( 0, 0,-1)
244	block_offset(7) = block_offset_def ( 0, 0, 0)
245	!
246	!-- Check the number of particle groups.
247	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
248	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
249	max_number_of_particle_groups , &
250	'&number_of_particle_groups reset to ', &
251	max_number_of_particle_groups
252	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
253	number_of_particle_groups = max_number_of_particle_groups
254	ENDIF
255
256	!
257	!-- Set default start positions, if necessary
258	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
259	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
260	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
261	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
262	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
263	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
264
265	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
266	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
267	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
268
269	DO j = 2, number_of_particle_groups
270	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
271	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
272	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
273	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
274	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
275	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
276	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
277	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
278	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
279	ENDDO
280
281	!
282	!-- Allocate arrays required for calculating particle SGS velocities
283	IF ( use_sgs_for_particles .AND. .NOT. cloud_droplets ) THEN
284	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
285	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
286	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
287	ENDIF
288
289	!
290	!-- Allocate array required for logarithmic vertical interpolation of
291	!-- horizontal particle velocities between the surface and the first vertical
292	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
293	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
294	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
295	!-- To obtain exact height levels of particles, linear interpolation is applied
296	!-- (see lpm_advec.f90).
297	IF ( constant_flux_layer ) THEN
298
299	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
300	z_p = zu(nzb+1) - zw(nzb)
301
302	!
303	!-- Calculate horizontal mean value of z0 used for logartihmic
304	!-- interpolation. Note: this is not exact for heterogeneous z0.
305	!-- However, sensitivity studies showed that the effect is
306	!-- negligible.
307	z0_av_local = SUM( z0(nys:nyn,nxl:nxr) )
308	z0_av_global = 0.0_wp
309
310	#if defined( __parallel )
311	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
312	comm2d, ierr )
313	#else
314	z0_av_global = z0_av_local
315	#endif
316
317	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
318	!
319	!-- Horizontal wind speed is zero below and at z0
320	log_z_z0(0) = 0.0_wp
321	!
322	!-- Calculate vertical depth of the sublayers
323	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
324	!
325	!-- Precalculate LOG(z/z0)
326	height_p = 0.0_wp
327	DO k = 1, number_of_sublayers
328
329	height_p = height_p + height_int
330	log_z_z0(k) = LOG( height_p / z0_av_global )
331
332	ENDDO
333
334
335	ENDIF
336
337	!
338	!-- Check boundary condition and set internal variables
339	SELECT CASE ( bc_par_b )
340
341	CASE ( 'absorb' )
342	ibc_par_b = 1
343
344	CASE ( 'reflect' )
345	ibc_par_b = 2
346
347	CASE DEFAULT
348	WRITE( message_string, * ) 'unknown boundary condition ', &
349	'bc_par_b = "', TRIM( bc_par_b ), '"'
350	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
351
352	END SELECT
353	SELECT CASE ( bc_par_t )
354
355	CASE ( 'absorb' )
356	ibc_par_t = 1
357
358	CASE ( 'reflect' )
359	ibc_par_t = 2
360
361	CASE DEFAULT
362	WRITE( message_string, * ) 'unknown boundary condition ', &
363	'bc_par_t = "', TRIM( bc_par_t ), '"'
364	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
365
366	END SELECT
367	SELECT CASE ( bc_par_lr )
368
369	CASE ( 'cyclic' )
370	ibc_par_lr = 0
371
372	CASE ( 'absorb' )
373	ibc_par_lr = 1
374
375	CASE ( 'reflect' )
376	ibc_par_lr = 2
377
378	CASE DEFAULT
379	WRITE( message_string, * ) 'unknown boundary condition ', &
380	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
381	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
382
383	END SELECT
384	SELECT CASE ( bc_par_ns )
385
386	CASE ( 'cyclic' )
387	ibc_par_ns = 0
388
389	CASE ( 'absorb' )
390	ibc_par_ns = 1
391
392	CASE ( 'reflect' )
393	ibc_par_ns = 2
394
395	CASE DEFAULT
396	WRITE( message_string, * ) 'unknown boundary condition ', &
397	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
398	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
399
400	END SELECT
401
402	!
403	!-- Initialize collision kernels
404	IF ( collision_kernel /= 'none' ) CALL init_kernels
405
406	!
407	!-- For the first model run of a possible job chain initialize the
408	!-- particles, otherwise read the particle data from restart file.
409	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
410	.AND. read_particles_from_restartfile ) THEN
411
412	CALL lpm_read_restart_file
413
414	ELSE
415
416	!
417	!-- Allocate particle arrays and set attributes of the initial set of
418	!-- particles, which can be also periodically released at later times.
419	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
420	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
421
422	maximum_number_of_particles = 0
423	number_of_particles = 0
424
425	sort_count = 0
426	prt_count = 0
427
428	!
429	!-- Initialize all particles with dummy values (otherwise errors may
430	!-- occur within restart runs). The reason for this is still not clear
431	!-- and may be presumably caused by errors in the respective user-interface.
432	zero_particle = particle_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
433	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
434	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
435	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0, 0, 0, &
436	0, .FALSE., -1)
437
438	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
439
440	!
441	!-- Set values for the density ratio and radius for all particle
442	!-- groups, if necessary
443	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
444	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
445	DO i = 2, number_of_particle_groups
446	IF ( density_ratio(i) == 9999999.9_wp ) THEN
447	density_ratio(i) = density_ratio(i-1)
448	ENDIF
449	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
450	ENDDO
451
452	DO i = 1, number_of_particle_groups
453	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
454	WRITE( message_string, * ) 'particle group #', i, 'has a', &
455	'density ratio /= 0 but radius = 0'
456	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
457	ENDIF
458	particle_groups(i)%density_ratio = density_ratio(i)
459	particle_groups(i)%radius = radius(i)
460	ENDDO
461
462	!
463	!-- Set a seed value for the random number generator to be exclusively
464	!-- used for the particle code. The generated random numbers should be
465	!-- different on the different PEs.
466	iran_part = iran_part + myid
467
468	CALL lpm_create_particle (PHASE_INIT)
469
470	!
471	!-- User modification of initial particles
472	CALL user_lpm_init
473
474	!
475	!-- Open file for statistical informations about particle conditions
476	IF ( write_particle_statistics ) THEN
477	CALL check_open( 80 )
478	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
479	number_of_particles, &
480	maximum_number_of_particles
481	CALL close_file( 80 )
482	ENDIF
483
484	ENDIF
485
486	!
487	!-- To avoid programm abort, assign particles array to the local version of
488	!-- first grid cell
489	number_of_particles = prt_count(nzb+1,nys,nxl)
490	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
491
492	!
493	!-- Formats
494	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
495
496	END SUBROUTINE lpm_init
497
498	!------------------------------------------------------------------------------!
499	! Description:
500	! ------------
501	!> @todo Missing subroutine description.
502	!------------------------------------------------------------------------------!
503	SUBROUTINE lpm_create_particle (phase)
504
505	USE lpm_exchange_horiz_mod, &
506	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
507
508	USE lpm_pack_arrays_mod, &
509	ONLY: lpm_pack_all_arrays
510
511	IMPLICIT NONE
512
513	INTEGER(iwp) :: alloc_size !<
514	INTEGER(iwp) :: i !<
515	INTEGER(iwp) :: ip !<
516	INTEGER(iwp) :: j !<
517	INTEGER(iwp) :: jp !<
518	INTEGER(iwp) :: kp !<
519	INTEGER(iwp) :: loop_stride !<
520	INTEGER(iwp) :: n !<
521	INTEGER(iwp) :: new_size !<
522
523	INTEGER(iwp), INTENT(IN) :: phase !<
524
525	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !<
526	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !<
527
528	LOGICAL :: first_stride !<
529
530	REAL(wp) :: pos_x !<
531	REAL(wp) :: pos_y !<
532	REAL(wp) :: pos_z !<
533
534	TYPE(particle_type),TARGET :: tmp_particle !<
535
536	!
537	!-- Calculate particle positions and store particle attributes, if
538	!-- particle is situated on this PE
539	DO loop_stride = 1, 2
540	first_stride = (loop_stride == 1)
541	IF ( first_stride ) THEN
542	local_count = 0 ! count number of particles
543	ELSE
544	local_count = prt_count ! Start address of new particles
545	ENDIF
546
547	n = 0
548	DO i = 1, number_of_particle_groups
549
550	pos_z = psb(i)
551
552	DO WHILE ( pos_z <= pst(i) )
553
554	pos_y = pss(i)
555
556	DO WHILE ( pos_y <= psn(i) )
557
558	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
559	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
560
561	pos_x = psl(i)
562
563	xloop: DO WHILE ( pos_x <= psr(i) )
564
565	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
566	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
567
568	DO j = 1, particles_per_point
569
570	n = n + 1
571	tmp_particle%x = pos_x
572	tmp_particle%y = pos_y
573	tmp_particle%z = pos_z
574	tmp_particle%age = 0.0_wp
575	tmp_particle%age_m = 0.0_wp
576	tmp_particle%dt_sum = 0.0_wp
577	tmp_particle%dvrp_psize = 0.0_wp !unused
578	tmp_particle%e_m = 0.0_wp
579	IF ( curvature_solution_effects ) THEN
580	!
581	!-- Initial values (internal timesteps, derivative)
582	!-- for Rosenbrock method
583	tmp_particle%rvar1 = 1.0E-12_wp
584	tmp_particle%rvar2 = 1.0E-3_wp
585	tmp_particle%rvar3 = -9999999.9_wp
586	ELSE
587	!
588	!-- Initial values for SGS velocities
589	tmp_particle%rvar1 = 0.0_wp
590	tmp_particle%rvar2 = 0.0_wp
591	tmp_particle%rvar3 = 0.0_wp
592	ENDIF
593	tmp_particle%speed_x = 0.0_wp
594	tmp_particle%speed_y = 0.0_wp
595	tmp_particle%speed_z = 0.0_wp
596	tmp_particle%origin_x = pos_x
597	tmp_particle%origin_y = pos_y
598	tmp_particle%origin_z = pos_z
599	tmp_particle%radius = particle_groups(i)%radius
600	tmp_particle%weight_factor = initial_weighting_factor
601	tmp_particle%class = 1
602	tmp_particle%group = i
603	tmp_particle%tailpoints = 0 !unused
604	tmp_particle%particle_mask = .TRUE.
605	tmp_particle%tail_id = 0 !unused
606
607	!
608	!-- Determine the grid indices of the particle position
609	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
610	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
611	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt
612
613	IF ( seed_follows_topography ) THEN
614	!
615	!-- Particle height is given relative to topography
616	kp = kp + nzb_w_inner(jp,ip)
617	tmp_particle%z = tmp_particle%z + zw(kp)
618	IF ( kp > nzt ) THEN
619	pos_x = pos_x + pdx(i)
620	CYCLE xloop
621	ENDIF
622	ENDIF
623
624	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
625	IF ( .NOT. first_stride ) THEN
626	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
627	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
628	ENDIF
629	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
630	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
631	ENDIF
632	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
633	ENDIF
634	ENDDO
635
636	ENDIF
637
638	pos_x = pos_x + pdx(i)
639
640	ENDDO xloop
641
642	ENDIF
643
644	pos_y = pos_y + pdy(i)
645
646	ENDDO
647
648	pos_z = pos_z + pdz(i)
649
650	ENDDO
651
652	ENDDO
653
654	IF ( first_stride ) THEN
655	DO ip = nxl, nxr
656	DO jp = nys, nyn
657	DO kp = nzb+1, nzt
658	IF ( phase == PHASE_INIT ) THEN
659	IF ( local_count(kp,jp,ip) > 0 ) THEN
660	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
661	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
662	min_nr_particle )
663	ELSE
664	alloc_size = min_nr_particle
665	ENDIF
666	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
667	DO n = 1, alloc_size
668	grid_particles(kp,jp,ip)%particles(n) = zero_particle
669	ENDDO
670	ELSEIF ( phase == PHASE_RELEASE ) THEN
671	IF ( local_count(kp,jp,ip) > 0 ) THEN
672	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
673	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
674	alloc_factor / 100.0_wp ) ), min_nr_particle )
675	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
676	CALL realloc_particles_array(ip,jp,kp,alloc_size)
677	ENDIF
678	ENDIF
679	ENDIF
680	ENDDO
681	ENDDO
682	ENDDO
683	ENDIF
684	ENDDO
685
686	local_start = prt_count+1
687	prt_count = local_count
688	!
689	!-- Add random fluctuation to particle positions
690	IF ( random_start_position ) THEN
691	DO ip = nxl, nxr
692	DO jp = nys, nyn
693	DO kp = nzb+1, nzt
694	number_of_particles = prt_count(kp,jp,ip)
695	IF ( number_of_particles <= 0 ) CYCLE
696	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
697
698	DO n = local_start(kp,jp,ip), number_of_particles !Move only new particles
699	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
700	particles(n)%x = particles(n)%x + &
701	( random_function( iran_part ) - 0.5_wp ) * &
702	pdx(particles(n)%group)
703	ENDIF
704	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
705	particles(n)%y = particles(n)%y + &
706	( random_function( iran_part ) - 0.5_wp ) * &
707	pdy(particles(n)%group)
708	ENDIF
709	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
710	particles(n)%z = particles(n)%z + &
711	( random_function( iran_part ) - 0.5_wp ) * &
712	pdz(particles(n)%group)
713	ENDIF
714	ENDDO
715	!
716	!-- Identify particles located outside the model domain
717	CALL lpm_boundary_conds( 'bottom/top' )
718	ENDDO
719	ENDDO
720	ENDDO
721	!
722	!-- Exchange particles between grid cells and processors
723	CALL lpm_move_particle
724	CALL lpm_exchange_horiz
725
726	ENDIF
727	!
728	!-- In case of random_start_position, delete particles identified by
729	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
730	!-- which is needed for a fast interpolation of the LES fields on the particle
731	!-- position.
732	CALL lpm_pack_all_arrays
733
734	!
735	!-- Determine maximum number of particles (i.e., all possible particles that
736	!-- have been allocated) and the current number of particles
737	DO ip = nxl, nxr
738	DO jp = nys, nyn
739	DO kp = nzb+1, nzt
740	maximum_number_of_particles = maximum_number_of_particles &
741	+ SIZE(grid_particles(kp,jp,ip)%particles)
742	number_of_particles = number_of_particles &
743	+ prt_count(kp,jp,ip)
744	ENDDO
745	ENDDO
746	ENDDO
747	!
748	!-- Calculate the number of particles of the total domain
749	#if defined( __parallel )
750	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
751	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
752	MPI_INTEGER, MPI_SUM, comm2d, ierr )
753	#else
754	total_number_of_particles = number_of_particles
755	#endif
756
757	RETURN
758
759	END SUBROUTINE lpm_create_particle
760
761	END MODULE lpm_init_mod

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