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source: palm/trunk/SOURCE/lpm_init.f90 @ 1713

Last change on this file since 1713 was 1692, checked in by maronga, 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 1997-2015 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! -----------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: lpm_init.f90 1692 2015-10-26 16:29:17Z raasch $
26	!
27	! 1691 2015-10-26 16:17:44Z maronga
28	! Renamed prandtl_layer to constant_flux_layer.
29	!
30	! 1685 2015-10-08 07:32:13Z raasch
31	! bugfix concerning vertical index offset in case of ocean
32	!
33	! 1682 2015-10-07 23:56:08Z knoop
34	! Code annotations made doxygen readable
35	!
36	! 1575 2015-03-27 09:56:27Z raasch
37	! initial vertical particle position is allowed to follow the topography
38	!
39	! 1359 2014-04-11 17:15:14Z hoffmann
40	! New particle structure integrated.
41	! Kind definition added to all floating point numbers.
42	! lpm_init changed form a subroutine to a module.
43	!
44	! 1327 2014-03-21 11:00:16Z raasch
45	! -netcdf_output
46	!
47	! 1322 2014-03-20 16:38:49Z raasch
48	! REAL functions provided with KIND-attribute
49	!
50	! 1320 2014-03-20 08:40:49Z raasch
51	! ONLY-attribute added to USE-statements,
52	! kind-parameters added to all INTEGER and REAL declaration statements,
53	! kinds are defined in new module kinds,
54	! revision history before 2012 removed,
55	! comment fields (!:) to be used for variable explanations added to
56	! all variable declaration statements
57	! bugfix: #if defined( __parallel ) added
58	!
59	! 1314 2014-03-14 18:25:17Z suehring
60	! Vertical logarithmic interpolation of horizontal particle speed for particles
61	! between roughness height and first vertical grid level.
62	!
63	! 1092 2013-02-02 11:24:22Z raasch
64	! unused variables removed
65	!
66	! 1036 2012-10-22 13:43:42Z raasch
67	! code put under GPL (PALM 3.9)
68	!
69	! 849 2012-03-15 10:35:09Z raasch
70	! routine renamed: init_particles -> lpm_init
71	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
72	! advec_particles),
73	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
74	!
75	! 828 2012-02-21 12:00:36Z raasch
76	! call of init_kernels, particle feature color renamed class
77	!
78	! 824 2012-02-17 09:09:57Z raasch
79	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
80	! array particles implemented as pointer
81	!
82	! 667 2010-12-23 12:06:00Z suehring/gryschka
83	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
84	! of arrays.
85	!
86	! Revision 1.1 1999/11/25 16:22:38 raasch
87	! Initial revision
88	!
89	!
90	! Description:
91	! ------------
92	!> This routine initializes a set of particles and their attributes (position,
93	!> radius, ..) which are used by the Lagrangian particle model (see lpm).
94	!------------------------------------------------------------------------------!
95	MODULE lpm_init_mod
96
97
98	USE arrays_3d, &
99	ONLY: de_dx, de_dy, de_dz, zu, zw, z0
100
101	USE cloud_parameters, &
102	ONLY: curvature_solution_effects
103
104	USE control_parameters, &
105	ONLY: cloud_droplets, constant_flux_layer, current_timestep_number, &
106	dz, initializing_actions, message_string, netcdf_data_format, &
107	ocean, simulated_time
108
109	USE dvrp_variables, &
110	ONLY: particle_color, particle_dvrpsize
111
112	USE grid_variables, &
113	ONLY: ddx, dx, ddy, dy
114
115	USE indices, &
116	ONLY: nx, nxl, nxlg, nxrg, nxr, ny, nyn, nys, nyng, nysg, nz, nzb, &
117	nzb_w_inner, nzt
118
119	USE kinds
120
121	USE lpm_collision_kernels_mod, &
122	ONLY: init_kernels
123
124	USE particle_attributes, &
125	ONLY: alloc_factor, bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
126	block_offset, block_offset_def, collision_kernel, &
127	density_ratio, dvrp_psize, grid_particles, &
128	initial_weighting_factor, ibc_par_b, ibc_par_lr, ibc_par_ns, &
129	ibc_par_t, iran_part, log_z_z0, &
130	max_number_of_particle_groups, maximum_number_of_particles, &
131	maximum_number_of_tailpoints, maximum_number_of_tails, &
132	minimum_tailpoint_distance, min_nr_particle, &
133	mpi_particle_type, new_tail_id, &
134	number_of_initial_tails, number_of_particles, &
135	number_of_particle_groups, number_of_sublayers, &
136	number_of_tails, offset_ocean_nzt, offset_ocean_nzt_m1, &
137	particles, particle_advection_start, particle_groups, &
138	particle_groups_type, particles_per_point, &
139	particle_tail_coordinates, particle_type, pdx, pdy, pdz, &
140	prt_count, psb, psl, psn, psr, pss, pst, &
141	radius, random_start_position, read_particles_from_restartfile,&
142	seed_follows_topography, skip_particles_for_tail, sort_count, &
143	tail_mask, total_number_of_particles, total_number_of_tails, &
144	use_particle_tails, use_sgs_for_particles, &
145	write_particle_statistics, uniform_particles, zero_particle, &
146	z0_av_global
147
148	USE pegrid
149
150	USE random_function_mod, &
151	ONLY: random_function
152
153	IMPLICIT NONE
154
155	PRIVATE
156
157	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !<
158	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !<
159
160	INTERFACE lpm_init
161	MODULE PROCEDURE lpm_init
162	END INTERFACE lpm_init
163
164	INTERFACE lpm_create_particle
165	MODULE PROCEDURE lpm_create_particle
166	END INTERFACE lpm_create_particle
167
168	PUBLIC lpm_init, lpm_create_particle
169
170	CONTAINS
171
172	!------------------------------------------------------------------------------!
173	! Description:
174	! ------------
175	!> @todo Missing subroutine description.
176	!------------------------------------------------------------------------------!
177	SUBROUTINE lpm_init
178
179	USE lpm_collision_kernels_mod, &
180	ONLY: init_kernels
181
182	IMPLICIT NONE
183
184	INTEGER(iwp) :: i !<
185	INTEGER(iwp) :: ip !<
186	INTEGER(iwp) :: j !<
187	INTEGER(iwp) :: jp !<
188	INTEGER(iwp) :: k !<
189	INTEGER(iwp) :: kp !<
190	INTEGER(iwp) :: n !<
191	INTEGER(iwp) :: nn !<
192
193	#if defined( __parallel )
194	INTEGER(iwp), DIMENSION(3) :: blocklengths !<
195	INTEGER(iwp), DIMENSION(3) :: displacements !<
196	INTEGER(iwp), DIMENSION(3) :: types !<
197	#endif
198	LOGICAL :: uniform_particles_l !<
199
200	REAL(wp) :: height_int !<
201	REAL(wp) :: height_p !<
202	REAL(wp) :: z_p !<
203	REAL(wp) :: z0_av_local !<
204
205	#if defined( __parallel )
206	!
207	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
208	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
209	#if defined( __twocachelines )
210	blocklengths(1) = 7; blocklengths(2) = 18; blocklengths(3) = 1
211	displacements(1) = 0; displacements(2) = 64; displacements(3) = 128
212
213	types(1) = MPI_REAL ! 64 bit words
214	types(2) = MPI_INTEGER ! 32 Bit words
215	types(3) = MPI_UB
216	#else
217	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
218	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
219
220	types(1) = MPI_REAL
221	types(2) = MPI_INTEGER
222	types(3) = MPI_UB
223	#endif
224	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
225	mpi_particle_type, ierr )
226	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
227	#endif
228
229	!
230	!-- In case of oceans runs, the vertical index calculations need an offset,
231	!-- because otherwise the k indices will become negative
232	IF ( ocean ) THEN
233	offset_ocean_nzt = nzt
234	offset_ocean_nzt_m1 = nzt - 1
235	ENDIF
236
237	!
238	!-- Define block offsets for dividing a gridcell in 8 sub cells
239
240	block_offset(0) = block_offset_def (-1,-1,-1)
241	block_offset(1) = block_offset_def (-1,-1, 0)
242	block_offset(2) = block_offset_def (-1, 0,-1)
243	block_offset(3) = block_offset_def (-1, 0, 0)
244	block_offset(4) = block_offset_def ( 0,-1,-1)
245	block_offset(5) = block_offset_def ( 0,-1, 0)
246	block_offset(6) = block_offset_def ( 0, 0,-1)
247	block_offset(7) = block_offset_def ( 0, 0, 0)
248	!
249	!-- Check the number of particle groups.
250	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
251	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
252	max_number_of_particle_groups , &
253	'&number_of_particle_groups reset to ', &
254	max_number_of_particle_groups
255	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
256	number_of_particle_groups = max_number_of_particle_groups
257	ENDIF
258
259	!
260	!-- Set default start positions, if necessary
261	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
262	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
263	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
264	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
265	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
266	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
267
268	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
269	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
270	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
271
272	DO j = 2, number_of_particle_groups
273	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
274	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
275	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
276	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
277	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
278	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
279	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
280	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
281	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
282	ENDDO
283
284	!
285	!-- Allocate arrays required for calculating particle SGS velocities
286	IF ( use_sgs_for_particles ) THEN
287	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
288	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
289	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
290	ENDIF
291
292	!
293	!-- Allocate array required for logarithmic vertical interpolation of
294	!-- horizontal particle velocities between the surface and the first vertical
295	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
296	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
297	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
298	!-- To obtain exact height levels of particles, linear interpolation is applied
299	!-- (see lpm_advec.f90).
300	IF ( constant_flux_layer ) THEN
301
302	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
303	z_p = zu(nzb+1) - zw(nzb)
304
305	!
306	!-- Calculate horizontal mean value of z0 used for logartihmic
307	!-- interpolation. Note: this is not exact for heterogeneous z0.
308	!-- However, sensitivity studies showed that the effect is
309	!-- negligible.
310	z0_av_local = SUM( z0(nys:nyn,nxl:nxr) )
311	z0_av_global = 0.0_wp
312
313	#if defined( __parallel )
314	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
315	comm2d, ierr )
316	#else
317	z0_av_global = z0_av_local
318	#endif
319
320	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
321	!
322	!-- Horizontal wind speed is zero below and at z0
323	log_z_z0(0) = 0.0_wp
324	!
325	!-- Calculate vertical depth of the sublayers
326	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
327	!
328	!-- Precalculate LOG(z/z0)
329	height_p = 0.0_wp
330	DO k = 1, number_of_sublayers
331
332	height_p = height_p + height_int
333	log_z_z0(k) = LOG( height_p / z0_av_global )
334
335	ENDDO
336
337
338	ENDIF
339
340	!
341	!-- Check boundary condition and set internal variables
342	SELECT CASE ( bc_par_b )
343
344	CASE ( 'absorb' )
345	ibc_par_b = 1
346
347	CASE ( 'reflect' )
348	ibc_par_b = 2
349
350	CASE DEFAULT
351	WRITE( message_string, * ) 'unknown boundary condition ', &
352	'bc_par_b = "', TRIM( bc_par_b ), '"'
353	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
354
355	END SELECT
356	SELECT CASE ( bc_par_t )
357
358	CASE ( 'absorb' )
359	ibc_par_t = 1
360
361	CASE ( 'reflect' )
362	ibc_par_t = 2
363
364	CASE DEFAULT
365	WRITE( message_string, * ) 'unknown boundary condition ', &
366	'bc_par_t = "', TRIM( bc_par_t ), '"'
367	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
368
369	END SELECT
370	SELECT CASE ( bc_par_lr )
371
372	CASE ( 'cyclic' )
373	ibc_par_lr = 0
374
375	CASE ( 'absorb' )
376	ibc_par_lr = 1
377
378	CASE ( 'reflect' )
379	ibc_par_lr = 2
380
381	CASE DEFAULT
382	WRITE( message_string, * ) 'unknown boundary condition ', &
383	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
384	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
385
386	END SELECT
387	SELECT CASE ( bc_par_ns )
388
389	CASE ( 'cyclic' )
390	ibc_par_ns = 0
391
392	CASE ( 'absorb' )
393	ibc_par_ns = 1
394
395	CASE ( 'reflect' )
396	ibc_par_ns = 2
397
398	CASE DEFAULT
399	WRITE( message_string, * ) 'unknown boundary condition ', &
400	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
401	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
402
403	END SELECT
404
405	!
406	!-- Initialize collision kernels
407	IF ( collision_kernel /= 'none' ) CALL init_kernels
408
409	!
410	!-- For the first model run of a possible job chain initialize the
411	!-- particles, otherwise read the particle data from restart file.
412	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
413	.AND. read_particles_from_restartfile ) THEN
414
415	CALL lpm_read_restart_file
416
417	ELSE
418
419	!
420	!-- Allocate particle arrays and set attributes of the initial set of
421	!-- particles, which can be also periodically released at later times.
422	!-- Also allocate array for particle tail coordinates, if needed.
423	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
424	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
425
426	maximum_number_of_particles = 0
427	number_of_particles = 0
428
429	sort_count = 0
430	prt_count = 0
431
432	!
433	!-- Initialize all particles with dummy values (otherwise errors may
434	!-- occur within restart runs). The reason for this is still not clear
435	!-- and may be presumably caused by errors in the respective user-interface.
436	#if defined( __twocachelines )
437	zero_particle = particle_type( 0.0_wp, 0.0_sp, 0.0_sp, 0.0_sp, 0.0_sp, &
438	0.0_sp, 0.0_sp, 0.0_wp, 0.0_wp, 0.0_wp, &
439	0, .FALSE., 0.0_wp, 0.0_wp, 0.0_wp, &
440	0.0_sp, 0.0_sp, 0.0_sp, 0.0_sp, 0.0_sp, &
441	0.0_sp, 0, 0, 0, -1)
442	#else
443	zero_particle = particle_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
444	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
445	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
446	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0, 0, 0, &
447	0, .FALSE., -1)
448	#endif
449	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
450
451	!
452	!-- Set the default particle size used for dvrp plots
453	IF ( dvrp_psize == 9999999.9_wp ) dvrp_psize = 0.2_wp * dx
454
455	!
456	!-- Set values for the density ratio and radius for all particle
457	!-- groups, if necessary
458	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
459	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
460	DO i = 2, number_of_particle_groups
461	IF ( density_ratio(i) == 9999999.9_wp ) THEN
462	density_ratio(i) = density_ratio(i-1)
463	ENDIF
464	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
465	ENDDO
466
467	DO i = 1, number_of_particle_groups
468	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
469	WRITE( message_string, * ) 'particle group #', i, 'has a', &
470	'density ratio /= 0 but radius = 0'
471	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
472	ENDIF
473	particle_groups(i)%density_ratio = density_ratio(i)
474	particle_groups(i)%radius = radius(i)
475	ENDDO
476
477	CALL lpm_create_particle (PHASE_INIT)
478	!
479	!-- Set a seed value for the random number generator to be exclusively
480	!-- used for the particle code. The generated random numbers should be
481	!-- different on the different PEs.
482	iran_part = iran_part + myid
483
484	!
485	!-- User modification of initial particles
486	CALL user_lpm_init
487
488	!
489	!-- Open file for statistical informations about particle conditions
490	IF ( write_particle_statistics ) THEN
491	CALL check_open( 80 )
492	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
493	number_of_particles, &
494	maximum_number_of_particles
495	CALL close_file( 80 )
496	ENDIF
497
498	!
499	!-- Check if particles are really uniform in color and radius (dvrp_size)
500	!-- (uniform_particles is preset TRUE)
501	IF ( uniform_particles ) THEN
502	DO ip = nxl, nxr
503	DO jp = nys, nyn
504	DO kp = nzb+1, nzt
505
506	n = prt_count(kp,jp,ip)
507	IF ( MINVAL( grid_particles(kp,jp,ip)%particles(1:n)%dvrp_psize ) == &
508	MAXVAL( grid_particles(kp,jp,ip)%particles(1:n)%dvrp_psize ) .AND. &
509	MINVAL( grid_particles(kp,jp,ip)%particles(1:n)%class ) == &
510	MAXVAL( grid_particles(kp,jp,ip)%particles(1:n)%class ) ) THEN
511	uniform_particles_l = .TRUE.
512	ELSE
513	uniform_particles_l = .FALSE.
514	ENDIF
515
516	ENDDO
517	ENDDO
518	ENDDO
519
520	#if defined( __parallel )
521	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
522	CALL MPI_ALLREDUCE( uniform_particles_l, uniform_particles, 1, &
523	MPI_LOGICAL, MPI_LAND, comm2d, ierr )
524	#else
525	uniform_particles = uniform_particles_l
526	#endif
527
528	ENDIF
529
530	!
531	!-- Particles will probably become none-uniform, if their size and color
532	!-- will be determined by flow variables
533	IF ( particle_color /= 'none' .OR. particle_dvrpsize /= 'none' ) THEN
534	uniform_particles = .FALSE.
535	ENDIF
536
537	! !kk Not implemented aft individual particle array fort every gridcell
538	! !
539	! !-- Set the beginning of the particle tails and their age
540	! IF ( use_particle_tails ) THEN
541	! !
542	! !-- Choose the maximum number of tails with respect to the maximum number
543	! !-- of particles and skip_particles_for_tail
544	! maximum_number_of_tails = maximum_number_of_particles / &
545	! skip_particles_for_tail
546	!
547	! !
548	! !-- Create a minimum number of tails in case that there is no tail
549	! !-- initially (otherwise, index errors will occur when adressing the
550	! !-- arrays below)
551	! IF ( maximum_number_of_tails == 0 ) maximum_number_of_tails = 10
552	!
553	! ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
554	! maximum_number_of_tails), &
555	! new_tail_id(maximum_number_of_tails), &
556	! tail_mask(maximum_number_of_tails) )
557	!
558	! particle_tail_coordinates = 0.0_wp
559	! minimum_tailpoint_distance = minimum_tailpoint_distance**2
560	! number_of_initial_tails = number_of_tails
561	!
562	! nn = 0
563	! DO n = 1, number_of_particles
564	! !
565	! !-- Only for those particles marked above with a provisional tail_id
566	! !-- tails will be created. Particles now get their final tail_id.
567	! IF ( particles(n)%tail_id /= 0 ) THEN
568	!
569	! nn = nn + 1
570	! particles(n)%tail_id = nn
571	!
572	! particle_tail_coordinates(1,1,nn) = particles(n)%x
573	! particle_tail_coordinates(1,2,nn) = particles(n)%y
574	! particle_tail_coordinates(1,3,nn) = particles(n)%z
575	! particle_tail_coordinates(1,4,nn) = particles(n)%class
576	! particles(n)%tailpoints = 1
577	! IF ( minimum_tailpoint_distance /= 0.0_wp ) THEN
578	! particle_tail_coordinates(2,1,nn) = particles(n)%x
579	! particle_tail_coordinates(2,2,nn) = particles(n)%y
580	! particle_tail_coordinates(2,3,nn) = particles(n)%z
581	! particle_tail_coordinates(2,4,nn) = particles(n)%class
582	! particle_tail_coordinates(1:2,5,nn) = 0.0_wp
583	! particles(n)%tailpoints = 2
584	! ENDIF
585	!
586	! ENDIF
587	! ENDDO
588	! ENDIF
589	!
590	! !
591	! !-- Plot initial positions of particles (only if particle advection is
592	! !-- switched on from the beginning of the simulation (t=0))
593	! IF ( particle_advection_start == 0.0_wp ) CALL data_output_dvrp
594
595	ENDIF
596
597	!
598	!-- To avoid programm abort, assign particles array to the local version of
599	!-- first grid cell
600	number_of_particles = prt_count(nzb+1,nys,nxl)
601	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
602
603	!
604	!-- Formats
605	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
606
607	END SUBROUTINE lpm_init
608
609	!------------------------------------------------------------------------------!
610	! Description:
611	! ------------
612	!> @todo Missing subroutine description.
613	!------------------------------------------------------------------------------!
614	SUBROUTINE lpm_create_particle (phase)
615
616	USE lpm_exchange_horiz_mod, &
617	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
618
619	USE lpm_pack_arrays_mod, &
620	ONLY: lpm_pack_all_arrays
621
622	IMPLICIT NONE
623
624	INTEGER(iwp) :: alloc_size !<
625	INTEGER(iwp) :: i !<
626	INTEGER(iwp) :: ip !<
627	INTEGER(iwp) :: j !<
628	INTEGER(iwp) :: jp !<
629	INTEGER(iwp) :: kp !<
630	INTEGER(iwp) :: loop_stride !<
631	INTEGER(iwp) :: n !<
632	INTEGER(iwp) :: new_size !<
633	INTEGER(iwp) :: nn !<
634
635	INTEGER(iwp), INTENT(IN) :: phase !<
636
637	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !<
638	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !<
639
640	LOGICAL :: first_stride !<
641
642	REAL(wp) :: pos_x !<
643	REAL(wp) :: pos_y !<
644	REAL(wp) :: pos_z !<
645
646	TYPE(particle_type),TARGET :: tmp_particle !<
647
648	!
649	!-- Calculate particle positions and store particle attributes, if
650	!-- particle is situated on this PE
651	DO loop_stride = 1, 2
652	first_stride = (loop_stride == 1)
653	IF ( first_stride ) THEN
654	local_count = 0 ! count number of particles
655	ELSE
656	local_count = prt_count ! Start address of new particles
657	ENDIF
658
659	n = 0
660	DO i = 1, number_of_particle_groups
661
662	pos_z = psb(i)
663
664	DO WHILE ( pos_z <= pst(i) )
665
666	pos_y = pss(i)
667
668	DO WHILE ( pos_y <= psn(i) )
669
670	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
671	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
672
673	pos_x = psl(i)
674
675	xloop: DO WHILE ( pos_x <= psr(i) )
676
677	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
678	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
679
680	DO j = 1, particles_per_point
681
682	n = n + 1
683	#if defined( __twocachelines )
684	tmp_particle%x = pos_x
685	tmp_particle%y = pos_y
686	tmp_particle%z = pos_z
687	tmp_particle%age = 0.0_sp
688	tmp_particle%age_m = 0.0_sp
689	tmp_particle%dt_sum = 0.0_wp
690	tmp_particle%dvrp_psize = dvrp_psize
691	tmp_particle%e_m = 0.0_sp
692	IF ( curvature_solution_effects ) THEN
693	!
694	!-- Initial values (internal timesteps, derivative)
695	!-- for Rosenbrock method
696	tmp_particle%rvar1 = 1.0E-12_wp
697	tmp_particle%rvar2 = 1.0E-3_wp
698	tmp_particle%rvar3 = -9999999.9_wp
699	ELSE
700	!
701	!-- Initial values for SGS velocities
702	tmp_particle%rvar1 = 0.0_wp
703	tmp_particle%rvar2 = 0.0_wp
704	tmp_particle%rvar3 = 0.0_wp
705	ENDIF
706	tmp_particle%speed_x = 0.0_sp
707	tmp_particle%speed_y = 0.0_sp
708	tmp_particle%speed_z = 0.0_sp
709	tmp_particle%origin_x = pos_x
710	tmp_particle%origin_y = pos_y
711	tmp_particle%origin_z = pos_z
712	tmp_particle%radius = particle_groups(i)%radius
713	tmp_particle%weight_factor = initial_weighting_factor
714	tmp_particle%class = 1
715	tmp_particle%group = i
716	tmp_particle%tailpoints = 0
717	tmp_particle%particle_mask = .TRUE.
718	#else
719	tmp_particle%x = pos_x
720	tmp_particle%y = pos_y
721	tmp_particle%z = pos_z
722	tmp_particle%age = 0.0_wp
723	tmp_particle%age_m = 0.0_wp
724	tmp_particle%dt_sum = 0.0_wp
725	tmp_particle%dvrp_psize = dvrp_psize
726	tmp_particle%e_m = 0.0_wp
727	IF ( curvature_solution_effects ) THEN
728	!
729	!-- Initial values (internal timesteps, derivative)
730	!-- for Rosenbrock method
731	tmp_particle%rvar1 = 1.0E-12_wp
732	tmp_particle%rvar2 = 1.0E-3_wp
733	tmp_particle%rvar3 = -9999999.9_wp
734	ELSE
735	!
736	!-- Initial values for SGS velocities
737	tmp_particle%rvar1 = 0.0_wp
738	tmp_particle%rvar2 = 0.0_wp
739	tmp_particle%rvar3 = 0.0_wp
740	ENDIF
741	tmp_particle%speed_x = 0.0_wp
742	tmp_particle%speed_y = 0.0_wp
743	tmp_particle%speed_z = 0.0_wp
744	tmp_particle%origin_x = pos_x
745	tmp_particle%origin_y = pos_y
746	tmp_particle%origin_z = pos_z
747	tmp_particle%radius = particle_groups(i)%radius
748	tmp_particle%weight_factor = initial_weighting_factor
749	tmp_particle%class = 1
750	tmp_particle%group = i
751	tmp_particle%tailpoints = 0
752	tmp_particle%particle_mask = .TRUE.
753	#endif
754	IF ( use_particle_tails .AND. &
755	MOD( n, skip_particles_for_tail ) == 0 ) THEN
756	number_of_tails = number_of_tails + 1
757	!
758	!-- This is a temporary provisional setting (see
759	!-- further below!)
760	tmp_particle%tail_id = number_of_tails
761	ELSE
762	tmp_particle%tail_id = 0
763	ENDIF
764	!
765	!-- Determine the grid indices of the particle position
766	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
767	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
768	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt
769
770	IF ( seed_follows_topography ) THEN
771	!
772	!-- Particle height is given relative to topography
773	kp = kp + nzb_w_inner(jp,ip)
774	tmp_particle%z = tmp_particle%z + zw(kp)
775	IF ( kp > nzt ) THEN
776	pos_x = pos_x + pdx(i)
777	CYCLE xloop
778	ENDIF
779	ENDIF
780
781	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
782	IF ( .NOT. first_stride ) THEN
783	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
784	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
785	ENDIF
786	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
787	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
788	ENDIF
789	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
790	ENDIF
791	ENDDO
792
793	ENDIF
794
795	pos_x = pos_x + pdx(i)
796
797	ENDDO xloop
798
799	ENDIF
800
801	pos_y = pos_y + pdy(i)
802
803	ENDDO
804
805	pos_z = pos_z + pdz(i)
806
807	ENDDO
808
809	ENDDO
810
811	IF ( first_stride ) THEN
812	DO ip = nxl, nxr
813	DO jp = nys, nyn
814	DO kp = nzb+1, nzt
815	IF ( phase == PHASE_INIT ) THEN
816	IF ( local_count(kp,jp,ip) > 0 ) THEN
817	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
818	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
819	min_nr_particle )
820	ELSE
821	alloc_size = min_nr_particle
822	ENDIF
823	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
824	DO n = 1, alloc_size
825	grid_particles(kp,jp,ip)%particles(n) = zero_particle
826	ENDDO
827	ELSEIF ( phase == PHASE_RELEASE ) THEN
828	IF ( local_count(kp,jp,ip) > 0 ) THEN
829	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
830	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
831	alloc_factor / 100.0_wp ) ), min_nr_particle )
832	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
833	CALL realloc_particles_array(ip,jp,kp,alloc_size)
834	ENDIF
835	ENDIF
836	ENDIF
837	ENDDO
838	ENDDO
839	ENDDO
840	ENDIF
841	ENDDO
842
843	local_start = prt_count+1
844	prt_count = local_count
845	!
846	!-- Add random fluctuation to particle positions
847	IF ( random_start_position ) THEN
848	DO ip = nxl, nxr
849	DO jp = nys, nyn
850	DO kp = nzb+1, nzt
851	number_of_particles = prt_count(kp,jp,ip)
852	IF ( number_of_particles <= 0 ) CYCLE
853	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
854
855	DO n = local_start(kp,jp,ip), number_of_particles !Move only new particles
856	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
857	particles(n)%x = particles(n)%x + &
858	( random_function( iran_part ) - 0.5_wp ) * &
859	pdx(particles(n)%group)
860	ENDIF
861	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
862	particles(n)%y = particles(n)%y + &
863	( random_function( iran_part ) - 0.5_wp ) * &
864	pdy(particles(n)%group)
865	ENDIF
866	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
867	particles(n)%z = particles(n)%z + &
868	( random_function( iran_part ) - 0.5_wp ) * &
869	pdz(particles(n)%group)
870	ENDIF
871	ENDDO
872	!
873	!-- Identify particles located outside the model domain
874	CALL lpm_boundary_conds( 'bottom/top' )
875	ENDDO
876	ENDDO
877	ENDDO
878	!
879	!-- Exchange particles between grid cells and processors
880	CALL lpm_move_particle
881	CALL lpm_exchange_horiz
882
883	ENDIF
884	!
885	!-- In case of random_start_position, delete particles identified by
886	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
887	!-- which is needed for a fast interpolation of the LES fields on the particle
888	!-- position.
889	CALL lpm_pack_all_arrays
890
891	!
892	!-- Determine maximum number of particles (i.e., all possible particles that
893	!-- have been allocated) and the current number of particles
894	DO ip = nxl, nxr
895	DO jp = nys, nyn
896	DO kp = nzb+1, nzt
897	maximum_number_of_particles = maximum_number_of_particles &
898	+ SIZE(grid_particles(kp,jp,ip)%particles)
899	number_of_particles = number_of_particles &
900	+ prt_count(kp,jp,ip)
901	ENDDO
902	ENDDO
903	ENDDO
904	!
905	!-- Calculate the number of particles and tails of the total domain
906	#if defined( __parallel )
907	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
908	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
909	MPI_INTEGER, MPI_SUM, comm2d, ierr )
910	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
911	CALL MPI_ALLREDUCE( number_of_tails, total_number_of_tails, 1, &
912	MPI_INTEGER, MPI_SUM, comm2d, ierr )
913	#else
914	total_number_of_particles = number_of_particles
915	total_number_of_tails = number_of_tails
916	#endif
917
918	RETURN
919
920	END SUBROUTINE lpm_create_particle
921
922	END MODULE lpm_init_mod

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