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source: palm/trunk/SOURCE/lpm_init.f90 @ 1822

Last change on this file since 1822 was 1822, checked in by hoffmann, 8 years ago
changes in LPM and bulk cloud microphysics
Property svn:keywords set to `Id`
File size: 28.3 KB

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

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