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source: palm/trunk/SOURCE/lpm_init.f90 @ 1359

Last change on this file since 1359 was 1359, checked in by hoffmann, 11 years ago
new Lagrangian particle structure integrated
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1	MODULE lpm_init_mod
2
3	!--------------------------------------------------------------------------------!
4	! This file is part of PALM.
5	!
6	! PALM is free software: you can redistribute it and/or modify it under the terms
7	! of the GNU General Public License as published by the Free Software Foundation,
8	! either version 3 of the License, or (at your option) any later version.
9	!
10	! PALM 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 1997-2014 Leibniz Universitaet Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	! New particle structure integrated.
23	! Kind definition added to all floating point numbers.
24	! lpm_init changed form a subroutine to a module.
25	!
26	! Former revisions:
27	! -----------------
28	! $Id: lpm_init.f90 1359 2014-04-11 17:15:14Z hoffmann $
29	!
30	! 1327 2014-03-21 11:00:16Z raasch
31	! -netcdf_output
32	!
33	! 1322 2014-03-20 16:38:49Z raasch
34	! REAL functions provided with KIND-attribute
35	!
36	! 1320 2014-03-20 08:40:49Z raasch
37	! ONLY-attribute added to USE-statements,
38	! kind-parameters added to all INTEGER and REAL declaration statements,
39	! kinds are defined in new module kinds,
40	! revision history before 2012 removed,
41	! comment fields (!:) to be used for variable explanations added to
42	! all variable declaration statements
43	! bugfix: #if defined( __parallel ) added
44	!
45	! 1314 2014-03-14 18:25:17Z suehring
46	! Vertical logarithmic interpolation of horizontal particle speed for particles
47	! between roughness height and first vertical grid level.
48	!
49	! 1092 2013-02-02 11:24:22Z raasch
50	! unused variables removed
51	!
52	! 1036 2012-10-22 13:43:42Z raasch
53	! code put under GPL (PALM 3.9)
54	!
55	! 849 2012-03-15 10:35:09Z raasch
56	! routine renamed: init_particles -> lpm_init
57	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
58	! advec_particles),
59	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
60	!
61	! 828 2012-02-21 12:00:36Z raasch
62	! call of init_kernels, particle feature color renamed class
63	!
64	! 824 2012-02-17 09:09:57Z raasch
65	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
66	! array particles implemented as pointer
67	!
68	! 667 2010-12-23 12:06:00Z suehring/gryschka
69	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
70	! of arrays.
71	!
72	! Revision 1.1 1999/11/25 16:22:38 raasch
73	! Initial revision
74	!
75	!
76	! Description:
77	! ------------
78	! This routine initializes a set of particles and their attributes (position,
79	! radius, ..) which are used by the Lagrangian particle model (see lpm).
80	!------------------------------------------------------------------------------!
81
82	USE arrays_3d, &
83	ONLY: de_dx, de_dy, de_dz, zu, zw, z0
84
85	USE cloud_parameters, &
86	ONLY: curvature_solution_effects
87
88	USE control_parameters, &
89	ONLY: cloud_droplets, current_timestep_number, dz, &
90	initializing_actions, message_string, netcdf_data_format, &
91	ocean, prandtl_layer, simulated_time
92
93	USE dvrp_variables, &
94	ONLY: particle_color, particle_dvrpsize
95
96	USE grid_variables, &
97	ONLY: ddx, dx, ddy, dy
98
99	USE indices, &
100	ONLY: nx, nxl, nxlg, nxrg, nxr, ny, nyn, nys, nyng, nysg, nz, nzb, nzt
101
102	USE kinds
103
104	USE lpm_collision_kernels_mod, &
105	ONLY: init_kernels
106
107	USE particle_attributes, &
108	ONLY: alloc_factor, bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
109	block_offset, block_offset_def, collision_kernel, &
110	density_ratio, dvrp_psize, grid_particles, &
111	initial_weighting_factor, ibc_par_b, ibc_par_lr, ibc_par_ns, &
112	ibc_par_t, iran_part, log_z_z0, &
113	max_number_of_particle_groups, maximum_number_of_particles, &
114	maximum_number_of_tailpoints, maximum_number_of_tails, &
115	minimum_tailpoint_distance, min_nr_particle, &
116	mpi_particle_type, new_tail_id, &
117	number_of_initial_tails, number_of_particles, &
118	number_of_particle_groups, number_of_sublayers, &
119	number_of_tails, offset_ocean_nzt, offset_ocean_nzt_m1, &
120	particles, particle_advection_start, particle_groups, &
121	particle_groups_type, particles_per_point, &
122	particle_tail_coordinates, particle_type, pdx, pdy, pdz, &
123	prt_count, psb, psl, psn, psr, pss, pst, &
124	radius, random_start_position, read_particles_from_restartfile,&
125	skip_particles_for_tail, sort_count, &
126	tail_mask, total_number_of_particles, total_number_of_tails, &
127	use_particle_tails, use_sgs_for_particles, &
128	write_particle_statistics, uniform_particles, zero_particle, &
129	z0_av_global
130
131	USE pegrid
132
133	USE random_function_mod, &
134	ONLY: random_function
135
136	IMPLICIT NONE
137
138	PRIVATE
139
140	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !:
141	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !:
142
143	INTERFACE lpm_init
144	MODULE PROCEDURE lpm_init
145	END INTERFACE lpm_init
146
147	INTERFACE lpm_create_particle
148	MODULE PROCEDURE lpm_create_particle
149	END INTERFACE lpm_create_particle
150
151	PUBLIC lpm_init, lpm_create_particle
152
153	CONTAINS
154
155	SUBROUTINE lpm_init
156
157	USE lpm_collision_kernels_mod, &
158	ONLY: init_kernels
159
160	IMPLICIT NONE
161
162	INTEGER(iwp) :: i !:
163	INTEGER(iwp) :: ip !:
164	INTEGER(iwp) :: j !:
165	INTEGER(iwp) :: jp !:
166	INTEGER(iwp) :: k !:
167	INTEGER(iwp) :: kp !:
168	INTEGER(iwp) :: n !:
169	INTEGER(iwp) :: nn !:
170
171	#if defined( __parallel )
172	INTEGER(iwp), DIMENSION(3) :: blocklengths !:
173	INTEGER(iwp), DIMENSION(3) :: displacements !:
174	INTEGER(iwp), DIMENSION(3) :: types !:
175	#endif
176	LOGICAL :: uniform_particles_l !:
177
178	REAL(wp) :: height_int !:
179	REAL(wp) :: height_p !:
180	REAL(wp) :: z_p !:
181	REAL(wp) :: z0_av_local !:
182
183	#if defined( __parallel )
184	!
185	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
186	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
187	#if defined( __twocachelines )
188	blocklengths(1) = 7; blocklengths(2) = 18; blocklengths(3) = 1
189	displacements(1) = 0; displacements(2) = 64; displacements(3) = 128
190
191	types(1) = MPI_REAL ! 64 bit words
192	types(2) = MPI_INTEGER ! 32 Bit words
193	types(3) = MPI_UB
194	#else
195	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
196	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
197
198	types(1) = MPI_REAL
199	types(2) = MPI_INTEGER
200	types(3) = MPI_UB
201	#endif
202	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
203	mpi_particle_type, ierr )
204	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
205	#endif
206
207	!
208	!-- In case of oceans runs, the vertical index calculations need an offset,
209	!-- because otherwise the k indices will become negative
210	IF ( ocean ) THEN
211	offset_ocean_nzt = nzt
212	offset_ocean_nzt_m1 = nzt - 1
213	ENDIF
214
215	!
216	!-- Define block offsets for dividing a gridcell in 8 sub cells
217
218	block_offset(0) = block_offset_def (-1,-1,-1)
219	block_offset(1) = block_offset_def (-1,-1, 0)
220	block_offset(2) = block_offset_def (-1, 0,-1)
221	block_offset(3) = block_offset_def (-1, 0, 0)
222	block_offset(4) = block_offset_def ( 0,-1,-1)
223	block_offset(5) = block_offset_def ( 0,-1, 0)
224	block_offset(6) = block_offset_def ( 0, 0,-1)
225	block_offset(7) = block_offset_def ( 0, 0, 0)
226	!
227	!-- Check the number of particle groups.
228	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
229	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
230	max_number_of_particle_groups , &
231	'&number_of_particle_groups reset to ', &
232	max_number_of_particle_groups
233	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
234	number_of_particle_groups = max_number_of_particle_groups
235	ENDIF
236
237	!
238	!-- Set default start positions, if necessary
239	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
240	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
241	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
242	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
243	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
244	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
245
246	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
247	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
248	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
249
250	DO j = 2, number_of_particle_groups
251	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
252	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
253	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
254	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
255	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
256	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
257	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
258	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
259	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
260	ENDDO
261
262	!
263	!-- Allocate arrays required for calculating particle SGS velocities
264	IF ( use_sgs_for_particles ) THEN
265	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
266	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
267	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
268	ENDIF
269
270	!
271	!-- Allocate array required for logarithmic vertical interpolation of
272	!-- horizontal particle velocities between the surface and the first vertical
273	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
274	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
275	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
276	!-- To obtain exact height levels of particles, linear interpolation is applied
277	!-- (see lpm_advec.f90).
278	IF ( prandtl_layer ) THEN
279
280	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
281	z_p = zu(nzb+1) - zw(nzb)
282
283	!
284	!-- Calculate horizontal mean value of z0 used for logartihmic
285	!-- interpolation. Note: this is not exact for heterogeneous z0.
286	!-- However, sensitivity studies showed that the effect is
287	!-- negligible.
288	z0_av_local = SUM( z0(nys:nyn,nxl:nxr) )
289	z0_av_global = 0.0_wp
290
291	#if defined( __parallel )
292	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
293	comm2d, ierr )
294	#else
295	z0_av_global = z0_av_local
296	#endif
297
298	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
299	!
300	!-- Horizontal wind speed is zero below and at z0
301	log_z_z0(0) = 0.0_wp
302	!
303	!-- Calculate vertical depth of the sublayers
304	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
305	!
306	!-- Precalculate LOG(z/z0)
307	height_p = 0.0_wp
308	DO k = 1, number_of_sublayers
309
310	height_p = height_p + height_int
311	log_z_z0(k) = LOG( height_p / z0_av_global )
312
313	ENDDO
314
315
316	ENDIF
317
318	!
319	!-- Check boundary condition and set internal variables
320	SELECT CASE ( bc_par_b )
321
322	CASE ( 'absorb' )
323	ibc_par_b = 1
324
325	CASE ( 'reflect' )
326	ibc_par_b = 2
327
328	CASE DEFAULT
329	WRITE( message_string, * ) 'unknown boundary condition ', &
330	'bc_par_b = "', TRIM( bc_par_b ), '"'
331	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
332
333	END SELECT
334	SELECT CASE ( bc_par_t )
335
336	CASE ( 'absorb' )
337	ibc_par_t = 1
338
339	CASE ( 'reflect' )
340	ibc_par_t = 2
341
342	CASE DEFAULT
343	WRITE( message_string, * ) 'unknown boundary condition ', &
344	'bc_par_t = "', TRIM( bc_par_t ), '"'
345	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
346
347	END SELECT
348	SELECT CASE ( bc_par_lr )
349
350	CASE ( 'cyclic' )
351	ibc_par_lr = 0
352
353	CASE ( 'absorb' )
354	ibc_par_lr = 1
355
356	CASE ( 'reflect' )
357	ibc_par_lr = 2
358
359	CASE DEFAULT
360	WRITE( message_string, * ) 'unknown boundary condition ', &
361	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
362	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
363
364	END SELECT
365	SELECT CASE ( bc_par_ns )
366
367	CASE ( 'cyclic' )
368	ibc_par_ns = 0
369
370	CASE ( 'absorb' )
371	ibc_par_ns = 1
372
373	CASE ( 'reflect' )
374	ibc_par_ns = 2
375
376	CASE DEFAULT
377	WRITE( message_string, * ) 'unknown boundary condition ', &
378	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
379	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
380
381	END SELECT
382
383	!
384	!-- Initialize collision kernels
385	IF ( collision_kernel /= 'none' ) CALL init_kernels
386
387	!
388	!-- For the first model run of a possible job chain initialize the
389	!-- particles, otherwise read the particle data from restart file.
390	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
391	.AND. read_particles_from_restartfile ) THEN
392
393	CALL lpm_read_restart_file
394
395	ELSE
396
397	!
398	!-- Allocate particle arrays and set attributes of the initial set of
399	!-- particles, which can be also periodically released at later times.
400	!-- Also allocate array for particle tail coordinates, if needed.
401	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
402	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
403
404	maximum_number_of_particles = 0
405	number_of_particles = 0
406
407	sort_count = 0
408	prt_count = 0
409
410	!
411	!-- Initialize all particles with dummy values (otherwise errors may
412	!-- occur within restart runs). The reason for this is still not clear
413	!-- and may be presumably caused by errors in the respective user-interface.
414	#if defined( __twocachelines )
415	zero_particle = particle_type( 0.0_wp, 0.0_sp, 0.0_sp, 0.0_sp, 0.0_sp, &
416	0.0_sp, 0.0_sp, 0.0_wp, 0.0_wp, 0.0_wp, &
417	0, .FALSE., 0.0_wp, 0.0_wp, 0.0_wp, &
418	0.0_sp, 0.0_sp, 0.0_sp, 0.0_sp, 0.0_sp, &
419	0.0_sp, 0, 0, 0, -1)
420	#else
421	zero_particle = particle_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
422	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
423	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
424	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0, 0, 0, &
425	0, .FALSE., -1)
426	#endif
427	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
428
429	!
430	!-- Set the default particle size used for dvrp plots
431	IF ( dvrp_psize == 9999999.9_wp ) dvrp_psize = 0.2_wp * dx
432
433	!
434	!-- Set values for the density ratio and radius for all particle
435	!-- groups, if necessary
436	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
437	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
438	DO i = 2, number_of_particle_groups
439	IF ( density_ratio(i) == 9999999.9_wp ) THEN
440	density_ratio(i) = density_ratio(i-1)
441	ENDIF
442	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
443	ENDDO
444
445	DO i = 1, number_of_particle_groups
446	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
447	WRITE( message_string, * ) 'particle group #', i, 'has a', &
448	'density ratio /= 0 but radius = 0'
449	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
450	ENDIF
451	particle_groups(i)%density_ratio = density_ratio(i)
452	particle_groups(i)%radius = radius(i)
453	ENDDO
454
455	CALL lpm_create_particle (PHASE_INIT)
456	!
457	!-- Set a seed value for the random number generator to be exclusively
458	!-- used for the particle code. The generated random numbers should be
459	!-- different on the different PEs.
460	iran_part = iran_part + myid
461
462	!
463	!-- User modification of initial particles
464	CALL user_lpm_init
465
466	!
467	!-- Open file for statistical informations about particle conditions
468	IF ( write_particle_statistics ) THEN
469	CALL check_open( 80 )
470	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
471	number_of_particles, &
472	maximum_number_of_particles
473	CALL close_file( 80 )
474	ENDIF
475
476	!
477	!-- Check if particles are really uniform in color and radius (dvrp_size)
478	!-- (uniform_particles is preset TRUE)
479	IF ( uniform_particles ) THEN
480	DO ip = nxl, nxr
481	DO jp = nys, nyn
482	DO kp = nzb+1, nzt
483
484	n = prt_count(kp,jp,ip)
485	IF ( MINVAL( grid_particles(kp,jp,ip)%particles(1:n)%dvrp_psize ) == &
486	MAXVAL( grid_particles(kp,jp,ip)%particles(1:n)%dvrp_psize ) .AND. &
487	MINVAL( grid_particles(kp,jp,ip)%particles(1:n)%class ) == &
488	MAXVAL( grid_particles(kp,jp,ip)%particles(1:n)%class ) ) THEN
489	uniform_particles_l = .TRUE.
490	ELSE
491	uniform_particles_l = .FALSE.
492	ENDIF
493
494	ENDDO
495	ENDDO
496	ENDDO
497
498	#if defined( __parallel )
499	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
500	CALL MPI_ALLREDUCE( uniform_particles_l, uniform_particles, 1, &
501	MPI_LOGICAL, MPI_LAND, comm2d, ierr )
502	#else
503	uniform_particles = uniform_particles_l
504	#endif
505
506	ENDIF
507
508	!
509	!-- Particles will probably become none-uniform, if their size and color
510	!-- will be determined by flow variables
511	IF ( particle_color /= 'none' .OR. particle_dvrpsize /= 'none' ) THEN
512	uniform_particles = .FALSE.
513	ENDIF
514
515	! !kk Not implemented aft individual particle array fort every gridcell
516	! !
517	! !-- Set the beginning of the particle tails and their age
518	! IF ( use_particle_tails ) THEN
519	! !
520	! !-- Choose the maximum number of tails with respect to the maximum number
521	! !-- of particles and skip_particles_for_tail
522	! maximum_number_of_tails = maximum_number_of_particles / &
523	! skip_particles_for_tail
524	!
525	! !
526	! !-- Create a minimum number of tails in case that there is no tail
527	! !-- initially (otherwise, index errors will occur when adressing the
528	! !-- arrays below)
529	! IF ( maximum_number_of_tails == 0 ) maximum_number_of_tails = 10
530	!
531	! ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
532	! maximum_number_of_tails), &
533	! new_tail_id(maximum_number_of_tails), &
534	! tail_mask(maximum_number_of_tails) )
535	!
536	! particle_tail_coordinates = 0.0_wp
537	! minimum_tailpoint_distance = minimum_tailpoint_distance**2
538	! number_of_initial_tails = number_of_tails
539	!
540	! nn = 0
541	! DO n = 1, number_of_particles
542	! !
543	! !-- Only for those particles marked above with a provisional tail_id
544	! !-- tails will be created. Particles now get their final tail_id.
545	! IF ( particles(n)%tail_id /= 0 ) THEN
546	!
547	! nn = nn + 1
548	! particles(n)%tail_id = nn
549	!
550	! particle_tail_coordinates(1,1,nn) = particles(n)%x
551	! particle_tail_coordinates(1,2,nn) = particles(n)%y
552	! particle_tail_coordinates(1,3,nn) = particles(n)%z
553	! particle_tail_coordinates(1,4,nn) = particles(n)%class
554	! particles(n)%tailpoints = 1
555	! IF ( minimum_tailpoint_distance /= 0.0_wp ) THEN
556	! particle_tail_coordinates(2,1,nn) = particles(n)%x
557	! particle_tail_coordinates(2,2,nn) = particles(n)%y
558	! particle_tail_coordinates(2,3,nn) = particles(n)%z
559	! particle_tail_coordinates(2,4,nn) = particles(n)%class
560	! particle_tail_coordinates(1:2,5,nn) = 0.0_wp
561	! particles(n)%tailpoints = 2
562	! ENDIF
563	!
564	! ENDIF
565	! ENDDO
566	! ENDIF
567	!
568	! !
569	! !-- Plot initial positions of particles (only if particle advection is
570	! !-- switched on from the beginning of the simulation (t=0))
571	! IF ( particle_advection_start == 0.0_wp ) CALL data_output_dvrp
572
573	ENDIF
574
575	!
576	!-- To avoid programm abort, assign particles array to the local version of
577	!-- first grid cell
578	number_of_particles = prt_count(nzb+1,nys,nxl)
579	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
580
581	!
582	!-- Formats
583	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
584
585	END SUBROUTINE lpm_init
586
587	SUBROUTINE lpm_create_particle (phase)
588
589	USE lpm_exchange_horiz_mod, &
590	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
591
592	USE lpm_pack_arrays_mod, &
593	ONLY: lpm_pack_all_arrays
594
595	IMPLICIT NONE
596
597	INTEGER(iwp) :: alloc_size !:
598	INTEGER(iwp) :: i !:
599	INTEGER(iwp) :: ip !:
600	INTEGER(iwp) :: j !:
601	INTEGER(iwp) :: jp !:
602	INTEGER(iwp) :: kp !:
603	INTEGER(iwp) :: loop_stride !:
604	INTEGER(iwp) :: n !:
605	INTEGER(iwp) :: new_size !:
606	INTEGER(iwp) :: nn !:
607
608	INTEGER(iwp), INTENT(IN) :: phase !:
609
610	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !:
611	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !:
612
613	LOGICAL :: first_stride !:
614
615	REAL(wp) :: pos_x !:
616	REAL(wp) :: pos_y !:
617	REAL(wp) :: pos_z !:
618
619	TYPE(particle_type),TARGET :: tmp_particle !:
620
621	!
622	!-- Calculate particle positions and store particle attributes, if
623	!-- particle is situated on this PE
624	DO loop_stride = 1, 2
625	first_stride = (loop_stride == 1)
626	IF ( first_stride ) THEN
627	local_count = 0 ! count number of particles
628	ELSE
629	local_count = prt_count ! Start address of new particles
630	ENDIF
631
632	n = 0
633	DO i = 1, number_of_particle_groups
634
635	pos_z = psb(i)
636
637	DO WHILE ( pos_z <= pst(i) )
638
639	pos_y = pss(i)
640
641	DO WHILE ( pos_y <= psn(i) )
642
643	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
644	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
645
646	pos_x = psl(i)
647
648	DO WHILE ( pos_x <= psr(i) )
649
650	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
651	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
652
653	DO j = 1, particles_per_point
654
655	n = n + 1
656	#if defined( __twocachelines )
657	tmp_particle%x = pos_x
658	tmp_particle%y = pos_y
659	tmp_particle%z = pos_z
660	tmp_particle%age = 0.0_sp
661	tmp_particle%age_m = 0.0_sp
662	tmp_particle%dt_sum = 0.0_wp
663	tmp_particle%dvrp_psize = dvrp_psize
664	tmp_particle%e_m = 0.0_sp
665	IF ( curvature_solution_effects ) THEN
666	!
667	!-- Initial values (internal timesteps, derivative)
668	!-- for Rosenbrock method
669	tmp_particle%rvar1 = 1.0E-12_wp
670	tmp_particle%rvar2 = 1.0E-3_wp
671	tmp_particle%rvar3 = -9999999.9_wp
672	ELSE
673	!
674	!-- Initial values for SGS velocities
675	tmp_particle%rvar1 = 0.0_wp
676	tmp_particle%rvar2 = 0.0_wp
677	tmp_particle%rvar3 = 0.0_wp
678	ENDIF
679	tmp_particle%speed_x = 0.0_sp
680	tmp_particle%speed_y = 0.0_sp
681	tmp_particle%speed_z = 0.0_sp
682	tmp_particle%origin_x = pos_x
683	tmp_particle%origin_y = pos_y
684	tmp_particle%origin_z = pos_z
685	tmp_particle%radius = particle_groups(i)%radius
686	tmp_particle%weight_factor = initial_weighting_factor
687	tmp_particle%class = 1
688	tmp_particle%group = i
689	tmp_particle%tailpoints = 0
690	tmp_particle%particle_mask = .TRUE.
691	#else
692	tmp_particle%x = pos_x
693	tmp_particle%y = pos_y
694	tmp_particle%z = pos_z
695	tmp_particle%age = 0.0_wp
696	tmp_particle%age_m = 0.0_wp
697	tmp_particle%dt_sum = 0.0_wp
698	tmp_particle%dvrp_psize = dvrp_psize
699	tmp_particle%e_m = 0.0_wp
700	IF ( curvature_solution_effects ) THEN
701	!
702	!-- Initial values (internal timesteps, derivative)
703	!-- for Rosenbrock method
704	tmp_particle%rvar1 = 1.0E-12_wp
705	tmp_particle%rvar2 = 1.0E-3_wp
706	tmp_particle%rvar3 = -9999999.9_wp
707	ELSE
708	!
709	!-- Initial values for SGS velocities
710	tmp_particle%rvar1 = 0.0_wp
711	tmp_particle%rvar2 = 0.0_wp
712	tmp_particle%rvar3 = 0.0_wp
713	ENDIF
714	tmp_particle%speed_x = 0.0_wp
715	tmp_particle%speed_y = 0.0_wp
716	tmp_particle%speed_z = 0.0_wp
717	tmp_particle%origin_x = pos_x
718	tmp_particle%origin_y = pos_y
719	tmp_particle%origin_z = pos_z
720	tmp_particle%radius = particle_groups(i)%radius
721	tmp_particle%weight_factor = initial_weighting_factor
722	tmp_particle%class = 1
723	tmp_particle%group = i
724	tmp_particle%tailpoints = 0
725	tmp_particle%particle_mask = .TRUE.
726	#endif
727	IF ( use_particle_tails .AND. &
728	MOD( n, skip_particles_for_tail ) == 0 ) THEN
729	number_of_tails = number_of_tails + 1
730	!
731	!-- This is a temporary provisional setting (see
732	!-- further below!)
733	tmp_particle%tail_id = number_of_tails
734	ELSE
735	tmp_particle%tail_id = 0
736	ENDIF
737	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
738	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
739	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt_m1
740
741	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
742	IF ( .NOT. first_stride ) THEN
743	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
744	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
745	ENDIF
746	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
747	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
748	ENDIF
749	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
750	ENDIF
751	ENDDO
752
753	ENDIF
754
755	pos_x = pos_x + pdx(i)
756
757	ENDDO
758
759	ENDIF
760
761	pos_y = pos_y + pdy(i)
762
763	ENDDO
764
765	pos_z = pos_z + pdz(i)
766
767	ENDDO
768
769	ENDDO
770
771	IF ( first_stride ) THEN
772	DO ip = nxl, nxr
773	DO jp = nys, nyn
774	DO kp = nzb+1, nzt
775	IF ( phase == PHASE_INIT ) THEN
776	IF ( local_count(kp,jp,ip) > 0 ) THEN
777	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
778	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
779	min_nr_particle )
780	ELSE
781	alloc_size = min_nr_particle
782	ENDIF
783	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
784	DO n = 1, alloc_size
785	grid_particles(kp,jp,ip)%particles(n) = zero_particle
786	ENDDO
787	ELSEIF ( phase == PHASE_RELEASE ) THEN
788	IF ( local_count(kp,jp,ip) > 0 ) THEN
789	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
790	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
791	alloc_factor / 100.0_wp ) ), min_nr_particle )
792	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
793	CALL realloc_particles_array(ip,jp,kp,alloc_size)
794	ENDIF
795	ENDIF
796	ENDIF
797	ENDDO
798	ENDDO
799	ENDDO
800	ENDIF
801	ENDDO
802
803	local_start = prt_count+1
804	prt_count = local_count
805	!
806	!-- Add random fluctuation to particle positions
807	IF ( random_start_position ) THEN
808	DO ip = nxl, nxr
809	DO jp = nys, nyn
810	DO kp = nzb+1, nzt
811	number_of_particles = prt_count(kp,jp,ip)
812	IF ( number_of_particles <= 0 ) CYCLE
813	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
814
815	DO n = local_start(kp,jp,ip), number_of_particles !Move only new particles
816	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
817	particles(n)%x = particles(n)%x + &
818	( random_function( iran_part ) - 0.5_wp ) * &
819	pdx(particles(n)%group)
820	ENDIF
821	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
822	particles(n)%y = particles(n)%y + &
823	( random_function( iran_part ) - 0.5_wp ) * &
824	pdy(particles(n)%group)
825	ENDIF
826	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
827	particles(n)%z = particles(n)%z + &
828	( random_function( iran_part ) - 0.5_wp ) * &
829	pdz(particles(n)%group)
830	ENDIF
831	ENDDO
832	!
833	!-- Identify particles located outside the model domain
834	CALL lpm_boundary_conds( 'bottom/top' )
835	ENDDO
836	ENDDO
837	ENDDO
838	!
839	!-- Exchange particles between grid cells and processors
840	CALL lpm_move_particle
841	CALL lpm_exchange_horiz
842
843	ENDIF
844	!
845	!-- In case of random_start_position, delete particles identified by
846	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
847	!-- which is needed for a fast interpolation of the LES fields on the particle
848	!-- position.
849	CALL lpm_pack_all_arrays
850
851	!
852	!-- Determine maximum number of particles (i.e., all possible particles that
853	!-- have been allocated) and the current number of particles
854	DO ip = nxl, nxr
855	DO jp = nys, nyn
856	DO kp = nzb+1, nzt
857	maximum_number_of_particles = maximum_number_of_particles &
858	+ SIZE(grid_particles(kp,jp,ip)%particles)
859	number_of_particles = number_of_particles &
860	+ prt_count(kp,jp,ip)
861	ENDDO
862	ENDDO
863	ENDDO
864	!
865	!-- Calculate the number of particles and tails of the total domain
866	#if defined( __parallel )
867	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
868	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
869	MPI_INTEGER, MPI_SUM, comm2d, ierr )
870	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
871	CALL MPI_ALLREDUCE( number_of_tails, total_number_of_tails, 1, &
872	MPI_INTEGER, MPI_SUM, comm2d, ierr )
873	#else
874	total_number_of_particles = number_of_particles
875	total_number_of_tails = number_of_tails
876	#endif
877
878	RETURN
879
880	END SUBROUTINE lpm_create_particle
881
882	END MODULE lpm_init_mod

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