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source: palm/trunk/SOURCE/lpm_init.f90 @ 1835

Last change on this file since 1835 was 1832, checked in by hoffmann, 9 years ago
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1	!> @file lpm_init.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.f90 1832 2016-04-07 13:28:15Z raasch $
26	!
27	! 1831 2016-04-07 13:15:51Z hoffmann
28	! curvature_solution_effects moved to particle_attributes
29	!
30	! 1822 2016-04-07 07:49:42Z hoffmann
31	! Unused variables removed.
32	!
33	! 1783 2016-03-06 18:36:17Z raasch
34	! netcdf module added
35	!
36	! 1725 2015-11-17 13:01:51Z hoffmann
37	! Bugfix: Processor-dependent seed for random function is generated before it is
38	! used.
39	!
40	! 1691 2015-10-26 16:17:44Z maronga
41	! Renamed prandtl_layer to constant_flux_layer.
42	!
43	! 1685 2015-10-08 07:32:13Z raasch
44	! bugfix concerning vertical index offset in case of ocean
45	!
46	! 1682 2015-10-07 23:56:08Z knoop
47	! Code annotations made doxygen readable
48	!
49	! 1575 2015-03-27 09:56:27Z raasch
50	! initial vertical particle position is allowed to follow the topography
51	!
52	! 1359 2014-04-11 17:15:14Z hoffmann
53	! New particle structure integrated.
54	! Kind definition added to all floating point numbers.
55	! lpm_init changed form a subroutine to a module.
56	!
57	! 1327 2014-03-21 11:00:16Z raasch
58	! -netcdf_output
59	!
60	! 1322 2014-03-20 16:38:49Z raasch
61	! REAL functions provided with KIND-attribute
62	!
63	! 1320 2014-03-20 08:40:49Z raasch
64	! ONLY-attribute added to USE-statements,
65	! kind-parameters added to all INTEGER and REAL declaration statements,
66	! kinds are defined in new module kinds,
67	! revision history before 2012 removed,
68	! comment fields (!:) to be used for variable explanations added to
69	! all variable declaration statements
70	! bugfix: #if defined( __parallel ) added
71	!
72	! 1314 2014-03-14 18:25:17Z suehring
73	! Vertical logarithmic interpolation of horizontal particle speed for particles
74	! between roughness height and first vertical grid level.
75	!
76	! 1092 2013-02-02 11:24:22Z raasch
77	! unused variables removed
78	!
79	! 1036 2012-10-22 13:43:42Z raasch
80	! code put under GPL (PALM 3.9)
81	!
82	! 849 2012-03-15 10:35:09Z raasch
83	! routine renamed: init_particles -> lpm_init
84	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
85	! advec_particles),
86	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
87	!
88	! 828 2012-02-21 12:00:36Z raasch
89	! call of init_kernels, particle feature color renamed class
90	!
91	! 824 2012-02-17 09:09:57Z raasch
92	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
93	! array particles implemented as pointer
94	!
95	! 667 2010-12-23 12:06:00Z suehring/gryschka
96	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
97	! of arrays.
98	!
99	! Revision 1.1 1999/11/25 16:22:38 raasch
100	! Initial revision
101	!
102	!
103	! Description:
104	! ------------
105	!> This routine initializes a set of particles and their attributes (position,
106	!> radius, ..) which are used by the Lagrangian particle model (see lpm).
107	!------------------------------------------------------------------------------!
108	MODULE lpm_init_mod
109
110
111	USE arrays_3d, &
112	ONLY: de_dx, de_dy, de_dz, zu, zw, z0
113
114	USE control_parameters, &
115	ONLY: cloud_droplets, constant_flux_layer, current_timestep_number, &
116	dz, initializing_actions, message_string, ocean, simulated_time
117
118	USE grid_variables, &
119	ONLY: ddx, dx, ddy, dy
120
121	USE indices, &
122	ONLY: nx, nxl, nxlg, nxrg, nxr, ny, nyn, nys, nyng, nysg, nz, nzb, &
123	nzb_w_inner, nzt
124
125	USE kinds
126
127	USE lpm_collision_kernels_mod, &
128	ONLY: init_kernels
129
130	USE netcdf_interface, &
131	ONLY: netcdf_data_format
132
133	USE particle_attributes, &
134	ONLY: alloc_factor, bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
135	block_offset, block_offset_def, collision_kernel, &
136	curvature_solution_effects, &
137	density_ratio, grid_particles, &
138	initial_weighting_factor, ibc_par_b, ibc_par_lr, ibc_par_ns, &
139	ibc_par_t, iran_part, log_z_z0, &
140	max_number_of_particle_groups, maximum_number_of_particles, &
141	min_nr_particle, mpi_particle_type, &
142	number_of_particles, &
143	number_of_particle_groups, number_of_sublayers, &
144	offset_ocean_nzt, offset_ocean_nzt_m1, &
145	particles, particle_advection_start, particle_groups, &
146	particle_groups_type, particles_per_point, &
147	particle_type, pdx, pdy, pdz, &
148	prt_count, psb, psl, psn, psr, pss, pst, &
149	radius, random_start_position, read_particles_from_restartfile,&
150	seed_follows_topography, sort_count, &
151	total_number_of_particles, &
152	use_sgs_for_particles, &
153	write_particle_statistics, uniform_particles, zero_particle, &
154	z0_av_global
155
156	USE pegrid
157
158	USE random_function_mod, &
159	ONLY: random_function
160
161	IMPLICIT NONE
162
163	PRIVATE
164
165	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !<
166	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !<
167
168	INTERFACE lpm_init
169	MODULE PROCEDURE lpm_init
170	END INTERFACE lpm_init
171
172	INTERFACE lpm_create_particle
173	MODULE PROCEDURE lpm_create_particle
174	END INTERFACE lpm_create_particle
175
176	PUBLIC lpm_init, lpm_create_particle
177
178	CONTAINS
179
180	!------------------------------------------------------------------------------!
181	! Description:
182	! ------------
183	!> @todo Missing subroutine description.
184	!------------------------------------------------------------------------------!
185	SUBROUTINE lpm_init
186
187	USE lpm_collision_kernels_mod, &
188	ONLY: init_kernels
189
190	IMPLICIT NONE
191
192	INTEGER(iwp) :: i !<
193	INTEGER(iwp) :: j !<
194	INTEGER(iwp) :: k !<
195
196	#if defined( __parallel )
197	INTEGER(iwp), DIMENSION(3) :: blocklengths !<
198	INTEGER(iwp), DIMENSION(3) :: displacements !<
199	INTEGER(iwp), DIMENSION(3) :: types !<
200	#endif
201
202	REAL(wp) :: height_int !<
203	REAL(wp) :: height_p !<
204	REAL(wp) :: z_p !<
205	REAL(wp) :: z0_av_local !<
206
207	#if defined( __parallel )
208	!
209	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
210	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
211	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
212	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
213
214	types(1) = MPI_REAL
215	types(2) = MPI_INTEGER
216	types(3) = MPI_UB
217	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
218	mpi_particle_type, ierr )
219	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
220	#endif
221
222	!
223	!-- In case of oceans runs, the vertical index calculations need an offset,
224	!-- because otherwise the k indices will become negative
225	IF ( ocean ) THEN
226	offset_ocean_nzt = nzt
227	offset_ocean_nzt_m1 = nzt - 1
228	ENDIF
229
230	!
231	!-- Define block offsets for dividing a gridcell in 8 sub cells
232
233	block_offset(0) = block_offset_def (-1,-1,-1)
234	block_offset(1) = block_offset_def (-1,-1, 0)
235	block_offset(2) = block_offset_def (-1, 0,-1)
236	block_offset(3) = block_offset_def (-1, 0, 0)
237	block_offset(4) = block_offset_def ( 0,-1,-1)
238	block_offset(5) = block_offset_def ( 0,-1, 0)
239	block_offset(6) = block_offset_def ( 0, 0,-1)
240	block_offset(7) = block_offset_def ( 0, 0, 0)
241	!
242	!-- Check the number of particle groups.
243	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
244	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
245	max_number_of_particle_groups , &
246	'&number_of_particle_groups reset to ', &
247	max_number_of_particle_groups
248	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
249	number_of_particle_groups = max_number_of_particle_groups
250	ENDIF
251
252	!
253	!-- Set default start positions, if necessary
254	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
255	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
256	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
257	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
258	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
259	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
260
261	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
262	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
263	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
264
265	DO j = 2, number_of_particle_groups
266	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
267	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
268	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
269	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
270	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
271	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
272	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
273	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
274	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
275	ENDDO
276
277	!
278	!-- Allocate arrays required for calculating particle SGS velocities
279	IF ( use_sgs_for_particles .AND. .NOT. cloud_droplets ) THEN
280	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
281	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
282	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
283	ENDIF
284
285	!
286	!-- Allocate array required for logarithmic vertical interpolation of
287	!-- horizontal particle velocities between the surface and the first vertical
288	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
289	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
290	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
291	!-- To obtain exact height levels of particles, linear interpolation is applied
292	!-- (see lpm_advec.f90).
293	IF ( constant_flux_layer ) THEN
294
295	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
296	z_p = zu(nzb+1) - zw(nzb)
297
298	!
299	!-- Calculate horizontal mean value of z0 used for logartihmic
300	!-- interpolation. Note: this is not exact for heterogeneous z0.
301	!-- However, sensitivity studies showed that the effect is
302	!-- negligible.
303	z0_av_local = SUM( z0(nys:nyn,nxl:nxr) )
304	z0_av_global = 0.0_wp
305
306	#if defined( __parallel )
307	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
308	comm2d, ierr )
309	#else
310	z0_av_global = z0_av_local
311	#endif
312
313	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
314	!
315	!-- Horizontal wind speed is zero below and at z0
316	log_z_z0(0) = 0.0_wp
317	!
318	!-- Calculate vertical depth of the sublayers
319	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
320	!
321	!-- Precalculate LOG(z/z0)
322	height_p = 0.0_wp
323	DO k = 1, number_of_sublayers
324
325	height_p = height_p + height_int
326	log_z_z0(k) = LOG( height_p / z0_av_global )
327
328	ENDDO
329
330
331	ENDIF
332
333	!
334	!-- Check boundary condition and set internal variables
335	SELECT CASE ( bc_par_b )
336
337	CASE ( 'absorb' )
338	ibc_par_b = 1
339
340	CASE ( 'reflect' )
341	ibc_par_b = 2
342
343	CASE DEFAULT
344	WRITE( message_string, * ) 'unknown boundary condition ', &
345	'bc_par_b = "', TRIM( bc_par_b ), '"'
346	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
347
348	END SELECT
349	SELECT CASE ( bc_par_t )
350
351	CASE ( 'absorb' )
352	ibc_par_t = 1
353
354	CASE ( 'reflect' )
355	ibc_par_t = 2
356
357	CASE DEFAULT
358	WRITE( message_string, * ) 'unknown boundary condition ', &
359	'bc_par_t = "', TRIM( bc_par_t ), '"'
360	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
361
362	END SELECT
363	SELECT CASE ( bc_par_lr )
364
365	CASE ( 'cyclic' )
366	ibc_par_lr = 0
367
368	CASE ( 'absorb' )
369	ibc_par_lr = 1
370
371	CASE ( 'reflect' )
372	ibc_par_lr = 2
373
374	CASE DEFAULT
375	WRITE( message_string, * ) 'unknown boundary condition ', &
376	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
377	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
378
379	END SELECT
380	SELECT CASE ( bc_par_ns )
381
382	CASE ( 'cyclic' )
383	ibc_par_ns = 0
384
385	CASE ( 'absorb' )
386	ibc_par_ns = 1
387
388	CASE ( 'reflect' )
389	ibc_par_ns = 2
390
391	CASE DEFAULT
392	WRITE( message_string, * ) 'unknown boundary condition ', &
393	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
394	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
395
396	END SELECT
397
398	!
399	!-- Initialize collision kernels
400	IF ( collision_kernel /= 'none' ) CALL init_kernels
401
402	!
403	!-- For the first model run of a possible job chain initialize the
404	!-- particles, otherwise read the particle data from restart file.
405	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
406	.AND. read_particles_from_restartfile ) THEN
407
408	CALL lpm_read_restart_file
409
410	ELSE
411
412	!
413	!-- Allocate particle arrays and set attributes of the initial set of
414	!-- particles, which can be also periodically released at later times.
415	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
416	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
417
418	maximum_number_of_particles = 0
419	number_of_particles = 0
420
421	sort_count = 0
422	prt_count = 0
423
424	!
425	!-- Initialize all particles with dummy values (otherwise errors may
426	!-- occur within restart runs). The reason for this is still not clear
427	!-- and may be presumably caused by errors in the respective user-interface.
428	zero_particle = particle_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
429	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
430	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
431	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0, 0, 0, &
432	0, .FALSE., -1)
433
434	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
435
436	!
437	!-- Set values for the density ratio and radius for all particle
438	!-- groups, if necessary
439	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
440	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
441	DO i = 2, number_of_particle_groups
442	IF ( density_ratio(i) == 9999999.9_wp ) THEN
443	density_ratio(i) = density_ratio(i-1)
444	ENDIF
445	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
446	ENDDO
447
448	DO i = 1, number_of_particle_groups
449	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
450	WRITE( message_string, * ) 'particle group #', i, 'has a', &
451	'density ratio /= 0 but radius = 0'
452	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
453	ENDIF
454	particle_groups(i)%density_ratio = density_ratio(i)
455	particle_groups(i)%radius = radius(i)
456	ENDDO
457
458	!
459	!-- Set a seed value for the random number generator to be exclusively
460	!-- used for the particle code. The generated random numbers should be
461	!-- different on the different PEs.
462	iran_part = iran_part + myid
463
464	CALL lpm_create_particle (PHASE_INIT)
465
466	!
467	!-- User modification of initial particles
468	CALL user_lpm_init
469
470	!
471	!-- Open file for statistical informations about particle conditions
472	IF ( write_particle_statistics ) THEN
473	CALL check_open( 80 )
474	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
475	number_of_particles, &
476	maximum_number_of_particles
477	CALL close_file( 80 )
478	ENDIF
479
480	ENDIF
481
482	!
483	!-- To avoid programm abort, assign particles array to the local version of
484	!-- first grid cell
485	number_of_particles = prt_count(nzb+1,nys,nxl)
486	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
487
488	!
489	!-- Formats
490	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
491
492	END SUBROUTINE lpm_init
493
494	!------------------------------------------------------------------------------!
495	! Description:
496	! ------------
497	!> @todo Missing subroutine description.
498	!------------------------------------------------------------------------------!
499	SUBROUTINE lpm_create_particle (phase)
500
501	USE lpm_exchange_horiz_mod, &
502	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
503
504	USE lpm_pack_arrays_mod, &
505	ONLY: lpm_pack_all_arrays
506
507	IMPLICIT NONE
508
509	INTEGER(iwp) :: alloc_size !<
510	INTEGER(iwp) :: i !<
511	INTEGER(iwp) :: ip !<
512	INTEGER(iwp) :: j !<
513	INTEGER(iwp) :: jp !<
514	INTEGER(iwp) :: kp !<
515	INTEGER(iwp) :: loop_stride !<
516	INTEGER(iwp) :: n !<
517	INTEGER(iwp) :: new_size !<
518
519	INTEGER(iwp), INTENT(IN) :: phase !<
520
521	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !<
522	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !<
523
524	LOGICAL :: first_stride !<
525
526	REAL(wp) :: pos_x !<
527	REAL(wp) :: pos_y !<
528	REAL(wp) :: pos_z !<
529
530	TYPE(particle_type),TARGET :: tmp_particle !<
531
532	!
533	!-- Calculate particle positions and store particle attributes, if
534	!-- particle is situated on this PE
535	DO loop_stride = 1, 2
536	first_stride = (loop_stride == 1)
537	IF ( first_stride ) THEN
538	local_count = 0 ! count number of particles
539	ELSE
540	local_count = prt_count ! Start address of new particles
541	ENDIF
542
543	n = 0
544	DO i = 1, number_of_particle_groups
545
546	pos_z = psb(i)
547
548	DO WHILE ( pos_z <= pst(i) )
549
550	pos_y = pss(i)
551
552	DO WHILE ( pos_y <= psn(i) )
553
554	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
555	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
556
557	pos_x = psl(i)
558
559	xloop: DO WHILE ( pos_x <= psr(i) )
560
561	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
562	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
563
564	DO j = 1, particles_per_point
565
566	n = n + 1
567	tmp_particle%x = pos_x
568	tmp_particle%y = pos_y
569	tmp_particle%z = pos_z
570	tmp_particle%age = 0.0_wp
571	tmp_particle%age_m = 0.0_wp
572	tmp_particle%dt_sum = 0.0_wp
573	tmp_particle%dvrp_psize = 0.0_wp !unused
574	tmp_particle%e_m = 0.0_wp
575	IF ( curvature_solution_effects ) THEN
576	!
577	!-- Initial values (internal timesteps, derivative)
578	!-- for Rosenbrock method
579	tmp_particle%rvar1 = 1.0E-12_wp
580	tmp_particle%rvar2 = 1.0E-3_wp
581	tmp_particle%rvar3 = -9999999.9_wp
582	ELSE
583	!
584	!-- Initial values for SGS velocities
585	tmp_particle%rvar1 = 0.0_wp
586	tmp_particle%rvar2 = 0.0_wp
587	tmp_particle%rvar3 = 0.0_wp
588	ENDIF
589	tmp_particle%speed_x = 0.0_wp
590	tmp_particle%speed_y = 0.0_wp
591	tmp_particle%speed_z = 0.0_wp
592	tmp_particle%origin_x = pos_x
593	tmp_particle%origin_y = pos_y
594	tmp_particle%origin_z = pos_z
595	tmp_particle%radius = particle_groups(i)%radius
596	tmp_particle%weight_factor = initial_weighting_factor
597	tmp_particle%class = 1
598	tmp_particle%group = i
599	tmp_particle%tailpoints = 0 !unused
600	tmp_particle%particle_mask = .TRUE.
601	tmp_particle%tail_id = 0 !unused
602
603	!
604	!-- Determine the grid indices of the particle position
605	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
606	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
607	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt
608
609	IF ( seed_follows_topography ) THEN
610	!
611	!-- Particle height is given relative to topography
612	kp = kp + nzb_w_inner(jp,ip)
613	tmp_particle%z = tmp_particle%z + zw(kp)
614	IF ( kp > nzt ) THEN
615	pos_x = pos_x + pdx(i)
616	CYCLE xloop
617	ENDIF
618	ENDIF
619
620	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
621	IF ( .NOT. first_stride ) THEN
622	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
623	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
624	ENDIF
625	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
626	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
627	ENDIF
628	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
629	ENDIF
630	ENDDO
631
632	ENDIF
633
634	pos_x = pos_x + pdx(i)
635
636	ENDDO xloop
637
638	ENDIF
639
640	pos_y = pos_y + pdy(i)
641
642	ENDDO
643
644	pos_z = pos_z + pdz(i)
645
646	ENDDO
647
648	ENDDO
649
650	IF ( first_stride ) THEN
651	DO ip = nxl, nxr
652	DO jp = nys, nyn
653	DO kp = nzb+1, nzt
654	IF ( phase == PHASE_INIT ) THEN
655	IF ( local_count(kp,jp,ip) > 0 ) THEN
656	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
657	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
658	min_nr_particle )
659	ELSE
660	alloc_size = min_nr_particle
661	ENDIF
662	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
663	DO n = 1, alloc_size
664	grid_particles(kp,jp,ip)%particles(n) = zero_particle
665	ENDDO
666	ELSEIF ( phase == PHASE_RELEASE ) THEN
667	IF ( local_count(kp,jp,ip) > 0 ) THEN
668	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
669	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
670	alloc_factor / 100.0_wp ) ), min_nr_particle )
671	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
672	CALL realloc_particles_array(ip,jp,kp,alloc_size)
673	ENDIF
674	ENDIF
675	ENDIF
676	ENDDO
677	ENDDO
678	ENDDO
679	ENDIF
680	ENDDO
681
682	local_start = prt_count+1
683	prt_count = local_count
684	!
685	!-- Add random fluctuation to particle positions
686	IF ( random_start_position ) THEN
687	DO ip = nxl, nxr
688	DO jp = nys, nyn
689	DO kp = nzb+1, nzt
690	number_of_particles = prt_count(kp,jp,ip)
691	IF ( number_of_particles <= 0 ) CYCLE
692	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
693
694	DO n = local_start(kp,jp,ip), number_of_particles !Move only new particles
695	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
696	particles(n)%x = particles(n)%x + &
697	( random_function( iran_part ) - 0.5_wp ) * &
698	pdx(particles(n)%group)
699	ENDIF
700	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
701	particles(n)%y = particles(n)%y + &
702	( random_function( iran_part ) - 0.5_wp ) * &
703	pdy(particles(n)%group)
704	ENDIF
705	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
706	particles(n)%z = particles(n)%z + &
707	( random_function( iran_part ) - 0.5_wp ) * &
708	pdz(particles(n)%group)
709	ENDIF
710	ENDDO
711	!
712	!-- Identify particles located outside the model domain
713	CALL lpm_boundary_conds( 'bottom/top' )
714	ENDDO
715	ENDDO
716	ENDDO
717	!
718	!-- Exchange particles between grid cells and processors
719	CALL lpm_move_particle
720	CALL lpm_exchange_horiz
721
722	ENDIF
723	!
724	!-- In case of random_start_position, delete particles identified by
725	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
726	!-- which is needed for a fast interpolation of the LES fields on the particle
727	!-- position.
728	CALL lpm_pack_all_arrays
729
730	!
731	!-- Determine maximum number of particles (i.e., all possible particles that
732	!-- have been allocated) and the current number of particles
733	DO ip = nxl, nxr
734	DO jp = nys, nyn
735	DO kp = nzb+1, nzt
736	maximum_number_of_particles = maximum_number_of_particles &
737	+ SIZE(grid_particles(kp,jp,ip)%particles)
738	number_of_particles = number_of_particles &
739	+ prt_count(kp,jp,ip)
740	ENDDO
741	ENDDO
742	ENDDO
743	!
744	!-- Calculate the number of particles of the total domain
745	#if defined( __parallel )
746	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
747	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
748	MPI_INTEGER, MPI_SUM, comm2d, ierr )
749	#else
750	total_number_of_particles = number_of_particles
751	#endif
752
753	RETURN
754
755	END SUBROUTINE lpm_create_particle
756
757	END MODULE lpm_init_mod

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