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source: palm/trunk/SOURCE/lpm_init.f90 @ 1826

Last change on this file since 1826 was 1823, checked in by hoffmann, 8 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 1823 2016-04-07 08:57:52Z maronga $
26	!
27	! 1822 2016-04-07 07:49:42Z hoffmann
28	! Unused variables removed.
29	!
30	! 1783 2016-03-06 18:36:17Z raasch
31	! netcdf module added
32	!
33	! 1725 2015-11-17 13:01:51Z hoffmann
34	! Bugfix: Processor-dependent seed for random function is generated before it is
35	! used.
36	!
37	! 1691 2015-10-26 16:17:44Z maronga
38	! Renamed prandtl_layer to constant_flux_layer.
39	!
40	! 1685 2015-10-08 07:32:13Z raasch
41	! bugfix concerning vertical index offset in case of ocean
42	!
43	! 1682 2015-10-07 23:56:08Z knoop
44	! Code annotations made doxygen readable
45	!
46	! 1575 2015-03-27 09:56:27Z raasch
47	! initial vertical particle position is allowed to follow the topography
48	!
49	! 1359 2014-04-11 17:15:14Z hoffmann
50	! New particle structure integrated.
51	! Kind definition added to all floating point numbers.
52	! lpm_init changed form a subroutine to a module.
53	!
54	! 1327 2014-03-21 11:00:16Z raasch
55	! -netcdf_output
56	!
57	! 1322 2014-03-20 16:38:49Z raasch
58	! REAL functions provided with KIND-attribute
59	!
60	! 1320 2014-03-20 08:40:49Z raasch
61	! ONLY-attribute added to USE-statements,
62	! kind-parameters added to all INTEGER and REAL declaration statements,
63	! kinds are defined in new module kinds,
64	! revision history before 2012 removed,
65	! comment fields (!:) to be used for variable explanations added to
66	! all variable declaration statements
67	! bugfix: #if defined( __parallel ) added
68	!
69	! 1314 2014-03-14 18:25:17Z suehring
70	! Vertical logarithmic interpolation of horizontal particle speed for particles
71	! between roughness height and first vertical grid level.
72	!
73	! 1092 2013-02-02 11:24:22Z raasch
74	! unused variables removed
75	!
76	! 1036 2012-10-22 13:43:42Z raasch
77	! code put under GPL (PALM 3.9)
78	!
79	! 849 2012-03-15 10:35:09Z raasch
80	! routine renamed: init_particles -> lpm_init
81	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
82	! advec_particles),
83	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
84	!
85	! 828 2012-02-21 12:00:36Z raasch
86	! call of init_kernels, particle feature color renamed class
87	!
88	! 824 2012-02-17 09:09:57Z raasch
89	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
90	! array particles implemented as pointer
91	!
92	! 667 2010-12-23 12:06:00Z suehring/gryschka
93	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
94	! of arrays.
95	!
96	! Revision 1.1 1999/11/25 16:22:38 raasch
97	! Initial revision
98	!
99	!
100	! Description:
101	! ------------
102	!> This routine initializes a set of particles and their attributes (position,
103	!> radius, ..) which are used by the Lagrangian particle model (see lpm).
104	!------------------------------------------------------------------------------!
105	MODULE lpm_init_mod
106
107
108	USE arrays_3d, &
109	ONLY: de_dx, de_dy, de_dz, zu, zw, z0
110
111	USE cloud_parameters, &
112	ONLY: curvature_solution_effects
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	density_ratio, grid_particles, &
137	initial_weighting_factor, ibc_par_b, ibc_par_lr, ibc_par_ns, &
138	ibc_par_t, iran_part, log_z_z0, &
139	max_number_of_particle_groups, maximum_number_of_particles, &
140	min_nr_particle, mpi_particle_type, &
141	number_of_particles, &
142	number_of_particle_groups, number_of_sublayers, &
143	offset_ocean_nzt, offset_ocean_nzt_m1, &
144	particles, particle_advection_start, particle_groups, &
145	particle_groups_type, particles_per_point, &
146	particle_type, pdx, pdy, pdz, &
147	prt_count, psb, psl, psn, psr, pss, pst, &
148	radius, random_start_position, read_particles_from_restartfile,&
149	seed_follows_topography, sort_count, &
150	total_number_of_particles, &
151	use_sgs_for_particles, &
152	write_particle_statistics, uniform_particles, zero_particle, &
153	z0_av_global
154
155	USE pegrid
156
157	USE random_function_mod, &
158	ONLY: random_function
159
160	IMPLICIT NONE
161
162	PRIVATE
163
164	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !<
165	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !<
166
167	INTERFACE lpm_init
168	MODULE PROCEDURE lpm_init
169	END INTERFACE lpm_init
170
171	INTERFACE lpm_create_particle
172	MODULE PROCEDURE lpm_create_particle
173	END INTERFACE lpm_create_particle
174
175	PUBLIC lpm_init, lpm_create_particle
176
177	CONTAINS
178
179	!------------------------------------------------------------------------------!
180	! Description:
181	! ------------
182	!> @todo Missing subroutine description.
183	!------------------------------------------------------------------------------!
184	SUBROUTINE lpm_init
185
186	USE lpm_collision_kernels_mod, &
187	ONLY: init_kernels
188
189	IMPLICIT NONE
190
191	INTEGER(iwp) :: i !<
192	INTEGER(iwp) :: j !<
193	INTEGER(iwp) :: k !<
194
195	#if defined( __parallel )
196	INTEGER(iwp), DIMENSION(3) :: blocklengths !<
197	INTEGER(iwp), DIMENSION(3) :: displacements !<
198	INTEGER(iwp), DIMENSION(3) :: types !<
199	#endif
200
201	REAL(wp) :: height_int !<
202	REAL(wp) :: height_p !<
203	REAL(wp) :: z_p !<
204	REAL(wp) :: z0_av_local !<
205
206	#if defined( __parallel )
207	!
208	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
209	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
210	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
211	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
212
213	types(1) = MPI_REAL
214	types(2) = MPI_INTEGER
215	types(3) = MPI_UB
216	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
217	mpi_particle_type, ierr )
218	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
219	#endif
220
221	!
222	!-- In case of oceans runs, the vertical index calculations need an offset,
223	!-- because otherwise the k indices will become negative
224	IF ( ocean ) THEN
225	offset_ocean_nzt = nzt
226	offset_ocean_nzt_m1 = nzt - 1
227	ENDIF
228
229	!
230	!-- Define block offsets for dividing a gridcell in 8 sub cells
231
232	block_offset(0) = block_offset_def (-1,-1,-1)
233	block_offset(1) = block_offset_def (-1,-1, 0)
234	block_offset(2) = block_offset_def (-1, 0,-1)
235	block_offset(3) = block_offset_def (-1, 0, 0)
236	block_offset(4) = block_offset_def ( 0,-1,-1)
237	block_offset(5) = block_offset_def ( 0,-1, 0)
238	block_offset(6) = block_offset_def ( 0, 0,-1)
239	block_offset(7) = block_offset_def ( 0, 0, 0)
240	!
241	!-- Check the number of particle groups.
242	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
243	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
244	max_number_of_particle_groups , &
245	'&number_of_particle_groups reset to ', &
246	max_number_of_particle_groups
247	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
248	number_of_particle_groups = max_number_of_particle_groups
249	ENDIF
250
251	!
252	!-- Set default start positions, if necessary
253	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
254	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
255	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
256	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
257	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
258	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
259
260	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
261	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
262	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
263
264	DO j = 2, number_of_particle_groups
265	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
266	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
267	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
268	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
269	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
270	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
271	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
272	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
273	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
274	ENDDO
275
276	!
277	!-- Allocate arrays required for calculating particle SGS velocities
278	IF ( use_sgs_for_particles .AND. .NOT. cloud_droplets ) THEN
279	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
280	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
281	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
282	ENDIF
283
284	!
285	!-- Allocate array required for logarithmic vertical interpolation of
286	!-- horizontal particle velocities between the surface and the first vertical
287	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
288	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
289	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
290	!-- To obtain exact height levels of particles, linear interpolation is applied
291	!-- (see lpm_advec.f90).
292	IF ( constant_flux_layer ) THEN
293
294	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
295	z_p = zu(nzb+1) - zw(nzb)
296
297	!
298	!-- Calculate horizontal mean value of z0 used for logartihmic
299	!-- interpolation. Note: this is not exact for heterogeneous z0.
300	!-- However, sensitivity studies showed that the effect is
301	!-- negligible.
302	z0_av_local = SUM( z0(nys:nyn,nxl:nxr) )
303	z0_av_global = 0.0_wp
304
305	#if defined( __parallel )
306	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
307	comm2d, ierr )
308	#else
309	z0_av_global = z0_av_local
310	#endif
311
312	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
313	!
314	!-- Horizontal wind speed is zero below and at z0
315	log_z_z0(0) = 0.0_wp
316	!
317	!-- Calculate vertical depth of the sublayers
318	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
319	!
320	!-- Precalculate LOG(z/z0)
321	height_p = 0.0_wp
322	DO k = 1, number_of_sublayers
323
324	height_p = height_p + height_int
325	log_z_z0(k) = LOG( height_p / z0_av_global )
326
327	ENDDO
328
329
330	ENDIF
331
332	!
333	!-- Check boundary condition and set internal variables
334	SELECT CASE ( bc_par_b )
335
336	CASE ( 'absorb' )
337	ibc_par_b = 1
338
339	CASE ( 'reflect' )
340	ibc_par_b = 2
341
342	CASE DEFAULT
343	WRITE( message_string, * ) 'unknown boundary condition ', &
344	'bc_par_b = "', TRIM( bc_par_b ), '"'
345	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
346
347	END SELECT
348	SELECT CASE ( bc_par_t )
349
350	CASE ( 'absorb' )
351	ibc_par_t = 1
352
353	CASE ( 'reflect' )
354	ibc_par_t = 2
355
356	CASE DEFAULT
357	WRITE( message_string, * ) 'unknown boundary condition ', &
358	'bc_par_t = "', TRIM( bc_par_t ), '"'
359	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
360
361	END SELECT
362	SELECT CASE ( bc_par_lr )
363
364	CASE ( 'cyclic' )
365	ibc_par_lr = 0
366
367	CASE ( 'absorb' )
368	ibc_par_lr = 1
369
370	CASE ( 'reflect' )
371	ibc_par_lr = 2
372
373	CASE DEFAULT
374	WRITE( message_string, * ) 'unknown boundary condition ', &
375	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
376	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
377
378	END SELECT
379	SELECT CASE ( bc_par_ns )
380
381	CASE ( 'cyclic' )
382	ibc_par_ns = 0
383
384	CASE ( 'absorb' )
385	ibc_par_ns = 1
386
387	CASE ( 'reflect' )
388	ibc_par_ns = 2
389
390	CASE DEFAULT
391	WRITE( message_string, * ) 'unknown boundary condition ', &
392	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
393	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
394
395	END SELECT
396
397	!
398	!-- Initialize collision kernels
399	IF ( collision_kernel /= 'none' ) CALL init_kernels
400
401	!
402	!-- For the first model run of a possible job chain initialize the
403	!-- particles, otherwise read the particle data from restart file.
404	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
405	.AND. read_particles_from_restartfile ) THEN
406
407	CALL lpm_read_restart_file
408
409	ELSE
410
411	!
412	!-- Allocate particle arrays and set attributes of the initial set of
413	!-- particles, which can be also periodically released at later times.
414	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
415	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
416
417	maximum_number_of_particles = 0
418	number_of_particles = 0
419
420	sort_count = 0
421	prt_count = 0
422
423	!
424	!-- Initialize all particles with dummy values (otherwise errors may
425	!-- occur within restart runs). The reason for this is still not clear
426	!-- and may be presumably caused by errors in the respective user-interface.
427	zero_particle = particle_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
428	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, 0, &
431	0, .FALSE., -1)
432
433	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
434
435	!
436	!-- Set values for the density ratio and radius for all particle
437	!-- groups, if necessary
438	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
439	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
440	DO i = 2, number_of_particle_groups
441	IF ( density_ratio(i) == 9999999.9_wp ) THEN
442	density_ratio(i) = density_ratio(i-1)
443	ENDIF
444	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
445	ENDDO
446
447	DO i = 1, number_of_particle_groups
448	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
449	WRITE( message_string, * ) 'particle group #', i, 'has a', &
450	'density ratio /= 0 but radius = 0'
451	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
452	ENDIF
453	particle_groups(i)%density_ratio = density_ratio(i)
454	particle_groups(i)%radius = radius(i)
455	ENDDO
456
457	!
458	!-- Set a seed value for the random number generator to be exclusively
459	!-- used for the particle code. The generated random numbers should be
460	!-- different on the different PEs.
461	iran_part = iran_part + myid
462
463	CALL lpm_create_particle (PHASE_INIT)
464
465	!
466	!-- User modification of initial particles
467	CALL user_lpm_init
468
469	!
470	!-- Open file for statistical informations about particle conditions
471	IF ( write_particle_statistics ) THEN
472	CALL check_open( 80 )
473	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
474	number_of_particles, &
475	maximum_number_of_particles
476	CALL close_file( 80 )
477	ENDIF
478
479	ENDIF
480
481	!
482	!-- To avoid programm abort, assign particles array to the local version of
483	!-- first grid cell
484	number_of_particles = prt_count(nzb+1,nys,nxl)
485	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
486
487	!
488	!-- Formats
489	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
490
491	END SUBROUTINE lpm_init
492
493	!------------------------------------------------------------------------------!
494	! Description:
495	! ------------
496	!> @todo Missing subroutine description.
497	!------------------------------------------------------------------------------!
498	SUBROUTINE lpm_create_particle (phase)
499
500	USE lpm_exchange_horiz_mod, &
501	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
502
503	USE lpm_pack_arrays_mod, &
504	ONLY: lpm_pack_all_arrays
505
506	IMPLICIT NONE
507
508	INTEGER(iwp) :: alloc_size !<
509	INTEGER(iwp) :: i !<
510	INTEGER(iwp) :: ip !<
511	INTEGER(iwp) :: j !<
512	INTEGER(iwp) :: jp !<
513	INTEGER(iwp) :: kp !<
514	INTEGER(iwp) :: loop_stride !<
515	INTEGER(iwp) :: n !<
516	INTEGER(iwp) :: new_size !<
517
518	INTEGER(iwp), INTENT(IN) :: phase !<
519
520	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !<
521	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !<
522
523	LOGICAL :: first_stride !<
524
525	REAL(wp) :: pos_x !<
526	REAL(wp) :: pos_y !<
527	REAL(wp) :: pos_z !<
528
529	TYPE(particle_type),TARGET :: tmp_particle !<
530
531	!
532	!-- Calculate particle positions and store particle attributes, if
533	!-- particle is situated on this PE
534	DO loop_stride = 1, 2
535	first_stride = (loop_stride == 1)
536	IF ( first_stride ) THEN
537	local_count = 0 ! count number of particles
538	ELSE
539	local_count = prt_count ! Start address of new particles
540	ENDIF
541
542	n = 0
543	DO i = 1, number_of_particle_groups
544
545	pos_z = psb(i)
546
547	DO WHILE ( pos_z <= pst(i) )
548
549	pos_y = pss(i)
550
551	DO WHILE ( pos_y <= psn(i) )
552
553	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
554	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
555
556	pos_x = psl(i)
557
558	xloop: DO WHILE ( pos_x <= psr(i) )
559
560	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
561	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
562
563	DO j = 1, particles_per_point
564
565	n = n + 1
566	tmp_particle%x = pos_x
567	tmp_particle%y = pos_y
568	tmp_particle%z = pos_z
569	tmp_particle%age = 0.0_wp
570	tmp_particle%age_m = 0.0_wp
571	tmp_particle%dt_sum = 0.0_wp
572	tmp_particle%dvrp_psize = 0.0_wp !unused
573	tmp_particle%e_m = 0.0_wp
574	IF ( curvature_solution_effects ) THEN
575	!
576	!-- Initial values (internal timesteps, derivative)
577	!-- for Rosenbrock method
578	tmp_particle%rvar1 = 1.0E-12_wp
579	tmp_particle%rvar2 = 1.0E-3_wp
580	tmp_particle%rvar3 = -9999999.9_wp
581	ELSE
582	!
583	!-- Initial values for SGS velocities
584	tmp_particle%rvar1 = 0.0_wp
585	tmp_particle%rvar2 = 0.0_wp
586	tmp_particle%rvar3 = 0.0_wp
587	ENDIF
588	tmp_particle%speed_x = 0.0_wp
589	tmp_particle%speed_y = 0.0_wp
590	tmp_particle%speed_z = 0.0_wp
591	tmp_particle%origin_x = pos_x
592	tmp_particle%origin_y = pos_y
593	tmp_particle%origin_z = pos_z
594	tmp_particle%radius = particle_groups(i)%radius
595	tmp_particle%weight_factor = initial_weighting_factor
596	tmp_particle%class = 1
597	tmp_particle%group = i
598	tmp_particle%tailpoints = 0 !unused
599	tmp_particle%particle_mask = .TRUE.
600	tmp_particle%tail_id = 0 !unused
601
602	!
603	!-- Determine the grid indices of the particle position
604	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
605	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
606	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt
607
608	IF ( seed_follows_topography ) THEN
609	!
610	!-- Particle height is given relative to topography
611	kp = kp + nzb_w_inner(jp,ip)
612	tmp_particle%z = tmp_particle%z + zw(kp)
613	IF ( kp > nzt ) THEN
614	pos_x = pos_x + pdx(i)
615	CYCLE xloop
616	ENDIF
617	ENDIF
618
619	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
620	IF ( .NOT. first_stride ) THEN
621	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
622	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
623	ENDIF
624	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
625	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
626	ENDIF
627	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
628	ENDIF
629	ENDDO
630
631	ENDIF
632
633	pos_x = pos_x + pdx(i)
634
635	ENDDO xloop
636
637	ENDIF
638
639	pos_y = pos_y + pdy(i)
640
641	ENDDO
642
643	pos_z = pos_z + pdz(i)
644
645	ENDDO
646
647	ENDDO
648
649	IF ( first_stride ) THEN
650	DO ip = nxl, nxr
651	DO jp = nys, nyn
652	DO kp = nzb+1, nzt
653	IF ( phase == PHASE_INIT ) THEN
654	IF ( local_count(kp,jp,ip) > 0 ) THEN
655	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
656	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
657	min_nr_particle )
658	ELSE
659	alloc_size = min_nr_particle
660	ENDIF
661	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
662	DO n = 1, alloc_size
663	grid_particles(kp,jp,ip)%particles(n) = zero_particle
664	ENDDO
665	ELSEIF ( phase == PHASE_RELEASE ) THEN
666	IF ( local_count(kp,jp,ip) > 0 ) THEN
667	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
668	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
669	alloc_factor / 100.0_wp ) ), min_nr_particle )
670	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
671	CALL realloc_particles_array(ip,jp,kp,alloc_size)
672	ENDIF
673	ENDIF
674	ENDIF
675	ENDDO
676	ENDDO
677	ENDDO
678	ENDIF
679	ENDDO
680
681	local_start = prt_count+1
682	prt_count = local_count
683	!
684	!-- Add random fluctuation to particle positions
685	IF ( random_start_position ) THEN
686	DO ip = nxl, nxr
687	DO jp = nys, nyn
688	DO kp = nzb+1, nzt
689	number_of_particles = prt_count(kp,jp,ip)
690	IF ( number_of_particles <= 0 ) CYCLE
691	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
692
693	DO n = local_start(kp,jp,ip), number_of_particles !Move only new particles
694	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
695	particles(n)%x = particles(n)%x + &
696	( random_function( iran_part ) - 0.5_wp ) * &
697	pdx(particles(n)%group)
698	ENDIF
699	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
700	particles(n)%y = particles(n)%y + &
701	( random_function( iran_part ) - 0.5_wp ) * &
702	pdy(particles(n)%group)
703	ENDIF
704	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
705	particles(n)%z = particles(n)%z + &
706	( random_function( iran_part ) - 0.5_wp ) * &
707	pdz(particles(n)%group)
708	ENDIF
709	ENDDO
710	!
711	!-- Identify particles located outside the model domain
712	CALL lpm_boundary_conds( 'bottom/top' )
713	ENDDO
714	ENDDO
715	ENDDO
716	!
717	!-- Exchange particles between grid cells and processors
718	CALL lpm_move_particle
719	CALL lpm_exchange_horiz
720
721	ENDIF
722	!
723	!-- In case of random_start_position, delete particles identified by
724	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
725	!-- which is needed for a fast interpolation of the LES fields on the particle
726	!-- position.
727	CALL lpm_pack_all_arrays
728
729	!
730	!-- Determine maximum number of particles (i.e., all possible particles that
731	!-- have been allocated) and the current number of particles
732	DO ip = nxl, nxr
733	DO jp = nys, nyn
734	DO kp = nzb+1, nzt
735	maximum_number_of_particles = maximum_number_of_particles &
736	+ SIZE(grid_particles(kp,jp,ip)%particles)
737	number_of_particles = number_of_particles &
738	+ prt_count(kp,jp,ip)
739	ENDDO
740	ENDDO
741	ENDDO
742	!
743	!-- Calculate the number of particles of the total domain
744	#if defined( __parallel )
745	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
746	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
747	MPI_INTEGER, MPI_SUM, comm2d, ierr )
748	#else
749	total_number_of_particles = number_of_particles
750	#endif
751
752	RETURN
753
754	END SUBROUTINE lpm_create_particle
755
756	END MODULE lpm_init_mod

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