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source: palm/trunk/SOURCE/lpm_init.f90 @ 1725

Last change on this file since 1725 was 1725, checked in by hoffmann, 8 years ago
Bugfix: Processor-dependent seed for random function is generated before it is used
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File size: 36.4 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 1997-2015 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! -----------------
21	! Bugfix: Processor-dependent seed for random function is generated before it is
22	! used.
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: lpm_init.f90 1725 2015-11-17 13:01:51Z hoffmann $
27	!
28	! 1691 2015-10-26 16:17:44Z maronga
29	! Renamed prandtl_layer to constant_flux_layer.
30	!
31	! 1685 2015-10-08 07:32:13Z raasch
32	! bugfix concerning vertical index offset in case of ocean
33	!
34	! 1682 2015-10-07 23:56:08Z knoop
35	! Code annotations made doxygen readable
36	!
37	! 1575 2015-03-27 09:56:27Z raasch
38	! initial vertical particle position is allowed to follow the topography
39	!
40	! 1359 2014-04-11 17:15:14Z hoffmann
41	! New particle structure integrated.
42	! Kind definition added to all floating point numbers.
43	! lpm_init changed form a subroutine to a module.
44	!
45	! 1327 2014-03-21 11:00:16Z raasch
46	! -netcdf_output
47	!
48	! 1322 2014-03-20 16:38:49Z raasch
49	! REAL functions provided with KIND-attribute
50	!
51	! 1320 2014-03-20 08:40:49Z raasch
52	! ONLY-attribute added to USE-statements,
53	! kind-parameters added to all INTEGER and REAL declaration statements,
54	! kinds are defined in new module kinds,
55	! revision history before 2012 removed,
56	! comment fields (!:) to be used for variable explanations added to
57	! all variable declaration statements
58	! bugfix: #if defined( __parallel ) added
59	!
60	! 1314 2014-03-14 18:25:17Z suehring
61	! Vertical logarithmic interpolation of horizontal particle speed for particles
62	! between roughness height and first vertical grid level.
63	!
64	! 1092 2013-02-02 11:24:22Z raasch
65	! unused variables removed
66	!
67	! 1036 2012-10-22 13:43:42Z raasch
68	! code put under GPL (PALM 3.9)
69	!
70	! 849 2012-03-15 10:35:09Z raasch
71	! routine renamed: init_particles -> lpm_init
72	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
73	! advec_particles),
74	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
75	!
76	! 828 2012-02-21 12:00:36Z raasch
77	! call of init_kernels, particle feature color renamed class
78	!
79	! 824 2012-02-17 09:09:57Z raasch
80	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
81	! array particles implemented as pointer
82	!
83	! 667 2010-12-23 12:06:00Z suehring/gryschka
84	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
85	! of arrays.
86	!
87	! Revision 1.1 1999/11/25 16:22:38 raasch
88	! Initial revision
89	!
90	!
91	! Description:
92	! ------------
93	!> This routine initializes a set of particles and their attributes (position,
94	!> radius, ..) which are used by the Lagrangian particle model (see lpm).
95	!------------------------------------------------------------------------------!
96	MODULE lpm_init_mod
97
98
99	USE arrays_3d, &
100	ONLY: de_dx, de_dy, de_dz, zu, zw, z0
101
102	USE cloud_parameters, &
103	ONLY: curvature_solution_effects
104
105	USE control_parameters, &
106	ONLY: cloud_droplets, constant_flux_layer, current_timestep_number, &
107	dz, initializing_actions, message_string, netcdf_data_format, &
108	ocean, simulated_time
109
110	USE dvrp_variables, &
111	ONLY: particle_color, particle_dvrpsize
112
113	USE grid_variables, &
114	ONLY: ddx, dx, ddy, dy
115
116	USE indices, &
117	ONLY: nx, nxl, nxlg, nxrg, nxr, ny, nyn, nys, nyng, nysg, nz, nzb, &
118	nzb_w_inner, nzt
119
120	USE kinds
121
122	USE lpm_collision_kernels_mod, &
123	ONLY: init_kernels
124
125	USE particle_attributes, &
126	ONLY: alloc_factor, bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
127	block_offset, block_offset_def, collision_kernel, &
128	density_ratio, dvrp_psize, grid_particles, &
129	initial_weighting_factor, ibc_par_b, ibc_par_lr, ibc_par_ns, &
130	ibc_par_t, iran_part, log_z_z0, &
131	max_number_of_particle_groups, maximum_number_of_particles, &
132	maximum_number_of_tailpoints, maximum_number_of_tails, &
133	minimum_tailpoint_distance, min_nr_particle, &
134	mpi_particle_type, new_tail_id, &
135	number_of_initial_tails, number_of_particles, &
136	number_of_particle_groups, number_of_sublayers, &
137	number_of_tails, offset_ocean_nzt, offset_ocean_nzt_m1, &
138	particles, particle_advection_start, particle_groups, &
139	particle_groups_type, particles_per_point, &
140	particle_tail_coordinates, particle_type, pdx, pdy, pdz, &
141	prt_count, psb, psl, psn, psr, pss, pst, &
142	radius, random_start_position, read_particles_from_restartfile,&
143	seed_follows_topography, skip_particles_for_tail, sort_count, &
144	tail_mask, total_number_of_particles, total_number_of_tails, &
145	use_particle_tails, use_sgs_for_particles, &
146	write_particle_statistics, uniform_particles, zero_particle, &
147	z0_av_global
148
149	USE pegrid
150
151	USE random_function_mod, &
152	ONLY: random_function
153
154	IMPLICIT NONE
155
156	PRIVATE
157
158	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !<
159	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !<
160
161	INTERFACE lpm_init
162	MODULE PROCEDURE lpm_init
163	END INTERFACE lpm_init
164
165	INTERFACE lpm_create_particle
166	MODULE PROCEDURE lpm_create_particle
167	END INTERFACE lpm_create_particle
168
169	PUBLIC lpm_init, lpm_create_particle
170
171	CONTAINS
172
173	!------------------------------------------------------------------------------!
174	! Description:
175	! ------------
176	!> @todo Missing subroutine description.
177	!------------------------------------------------------------------------------!
178	SUBROUTINE lpm_init
179
180	USE lpm_collision_kernels_mod, &
181	ONLY: init_kernels
182
183	IMPLICIT NONE
184
185	INTEGER(iwp) :: i !<
186	INTEGER(iwp) :: ip !<
187	INTEGER(iwp) :: j !<
188	INTEGER(iwp) :: jp !<
189	INTEGER(iwp) :: k !<
190	INTEGER(iwp) :: kp !<
191	INTEGER(iwp) :: n !<
192	INTEGER(iwp) :: nn !<
193
194	#if defined( __parallel )
195	INTEGER(iwp), DIMENSION(3) :: blocklengths !<
196	INTEGER(iwp), DIMENSION(3) :: displacements !<
197	INTEGER(iwp), DIMENSION(3) :: types !<
198	#endif
199	LOGICAL :: uniform_particles_l !<
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	#if defined( __twocachelines )
211	blocklengths(1) = 7; blocklengths(2) = 18; blocklengths(3) = 1
212	displacements(1) = 0; displacements(2) = 64; displacements(3) = 128
213
214	types(1) = MPI_REAL ! 64 bit words
215	types(2) = MPI_INTEGER ! 32 Bit words
216	types(3) = MPI_UB
217	#else
218	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
219	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
220
221	types(1) = MPI_REAL
222	types(2) = MPI_INTEGER
223	types(3) = MPI_UB
224	#endif
225	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
226	mpi_particle_type, ierr )
227	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
228	#endif
229
230	!
231	!-- In case of oceans runs, the vertical index calculations need an offset,
232	!-- because otherwise the k indices will become negative
233	IF ( ocean ) THEN
234	offset_ocean_nzt = nzt
235	offset_ocean_nzt_m1 = nzt - 1
236	ENDIF
237
238	!
239	!-- Define block offsets for dividing a gridcell in 8 sub cells
240
241	block_offset(0) = block_offset_def (-1,-1,-1)
242	block_offset(1) = block_offset_def (-1,-1, 0)
243	block_offset(2) = block_offset_def (-1, 0,-1)
244	block_offset(3) = block_offset_def (-1, 0, 0)
245	block_offset(4) = block_offset_def ( 0,-1,-1)
246	block_offset(5) = block_offset_def ( 0,-1, 0)
247	block_offset(6) = block_offset_def ( 0, 0,-1)
248	block_offset(7) = block_offset_def ( 0, 0, 0)
249	!
250	!-- Check the number of particle groups.
251	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
252	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
253	max_number_of_particle_groups , &
254	'&number_of_particle_groups reset to ', &
255	max_number_of_particle_groups
256	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
257	number_of_particle_groups = max_number_of_particle_groups
258	ENDIF
259
260	!
261	!-- Set default start positions, if necessary
262	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
263	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
264	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
265	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
266	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
267	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
268
269	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
270	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
271	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
272
273	DO j = 2, number_of_particle_groups
274	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
275	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
276	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
277	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
278	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
279	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
280	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
281	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
282	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
283	ENDDO
284
285	!
286	!-- Allocate arrays required for calculating particle SGS velocities
287	IF ( use_sgs_for_particles ) THEN
288	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
289	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
290	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
291	ENDIF
292
293	!
294	!-- Allocate array required for logarithmic vertical interpolation of
295	!-- horizontal particle velocities between the surface and the first vertical
296	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
297	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
298	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
299	!-- To obtain exact height levels of particles, linear interpolation is applied
300	!-- (see lpm_advec.f90).
301	IF ( constant_flux_layer ) THEN
302
303	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
304	z_p = zu(nzb+1) - zw(nzb)
305
306	!
307	!-- Calculate horizontal mean value of z0 used for logartihmic
308	!-- interpolation. Note: this is not exact for heterogeneous z0.
309	!-- However, sensitivity studies showed that the effect is
310	!-- negligible.
311	z0_av_local = SUM( z0(nys:nyn,nxl:nxr) )
312	z0_av_global = 0.0_wp
313
314	#if defined( __parallel )
315	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
316	comm2d, ierr )
317	#else
318	z0_av_global = z0_av_local
319	#endif
320
321	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
322	!
323	!-- Horizontal wind speed is zero below and at z0
324	log_z_z0(0) = 0.0_wp
325	!
326	!-- Calculate vertical depth of the sublayers
327	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
328	!
329	!-- Precalculate LOG(z/z0)
330	height_p = 0.0_wp
331	DO k = 1, number_of_sublayers
332
333	height_p = height_p + height_int
334	log_z_z0(k) = LOG( height_p / z0_av_global )
335
336	ENDDO
337
338
339	ENDIF
340
341	!
342	!-- Check boundary condition and set internal variables
343	SELECT CASE ( bc_par_b )
344
345	CASE ( 'absorb' )
346	ibc_par_b = 1
347
348	CASE ( 'reflect' )
349	ibc_par_b = 2
350
351	CASE DEFAULT
352	WRITE( message_string, * ) 'unknown boundary condition ', &
353	'bc_par_b = "', TRIM( bc_par_b ), '"'
354	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
355
356	END SELECT
357	SELECT CASE ( bc_par_t )
358
359	CASE ( 'absorb' )
360	ibc_par_t = 1
361
362	CASE ( 'reflect' )
363	ibc_par_t = 2
364
365	CASE DEFAULT
366	WRITE( message_string, * ) 'unknown boundary condition ', &
367	'bc_par_t = "', TRIM( bc_par_t ), '"'
368	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
369
370	END SELECT
371	SELECT CASE ( bc_par_lr )
372
373	CASE ( 'cyclic' )
374	ibc_par_lr = 0
375
376	CASE ( 'absorb' )
377	ibc_par_lr = 1
378
379	CASE ( 'reflect' )
380	ibc_par_lr = 2
381
382	CASE DEFAULT
383	WRITE( message_string, * ) 'unknown boundary condition ', &
384	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
385	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
386
387	END SELECT
388	SELECT CASE ( bc_par_ns )
389
390	CASE ( 'cyclic' )
391	ibc_par_ns = 0
392
393	CASE ( 'absorb' )
394	ibc_par_ns = 1
395
396	CASE ( 'reflect' )
397	ibc_par_ns = 2
398
399	CASE DEFAULT
400	WRITE( message_string, * ) 'unknown boundary condition ', &
401	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
402	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
403
404	END SELECT
405
406	!
407	!-- Initialize collision kernels
408	IF ( collision_kernel /= 'none' ) CALL init_kernels
409
410	!
411	!-- For the first model run of a possible job chain initialize the
412	!-- particles, otherwise read the particle data from restart file.
413	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
414	.AND. read_particles_from_restartfile ) THEN
415
416	CALL lpm_read_restart_file
417
418	ELSE
419
420	!
421	!-- Allocate particle arrays and set attributes of the initial set of
422	!-- particles, which can be also periodically released at later times.
423	!-- Also allocate array for particle tail coordinates, if needed.
424	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
425	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
426
427	maximum_number_of_particles = 0
428	number_of_particles = 0
429
430	sort_count = 0
431	prt_count = 0
432
433	!
434	!-- Initialize all particles with dummy values (otherwise errors may
435	!-- occur within restart runs). The reason for this is still not clear
436	!-- and may be presumably caused by errors in the respective user-interface.
437	#if defined( __twocachelines )
438	zero_particle = particle_type( 0.0_wp, 0.0_sp, 0.0_sp, 0.0_sp, 0.0_sp, &
439	0.0_sp, 0.0_sp, 0.0_wp, 0.0_wp, 0.0_wp, &
440	0, .FALSE., 0.0_wp, 0.0_wp, 0.0_wp, &
441	0.0_sp, 0.0_sp, 0.0_sp, 0.0_sp, 0.0_sp, &
442	0.0_sp, 0, 0, 0, -1)
443	#else
444	zero_particle = particle_type( 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_wp, &
447	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0, 0, 0, &
448	0, .FALSE., -1)
449	#endif
450	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
451
452	!
453	!-- Set the default particle size used for dvrp plots
454	IF ( dvrp_psize == 9999999.9_wp ) dvrp_psize = 0.2_wp * dx
455
456	!
457	!-- Set values for the density ratio and radius for all particle
458	!-- groups, if necessary
459	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
460	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
461	DO i = 2, number_of_particle_groups
462	IF ( density_ratio(i) == 9999999.9_wp ) THEN
463	density_ratio(i) = density_ratio(i-1)
464	ENDIF
465	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
466	ENDDO
467
468	DO i = 1, number_of_particle_groups
469	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
470	WRITE( message_string, * ) 'particle group #', i, 'has a', &
471	'density ratio /= 0 but radius = 0'
472	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
473	ENDIF
474	particle_groups(i)%density_ratio = density_ratio(i)
475	particle_groups(i)%radius = radius(i)
476	ENDDO
477
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	CALL lpm_create_particle (PHASE_INIT)
485
486	!
487	!-- User modification of initial particles
488	CALL user_lpm_init
489
490	!
491	!-- Open file for statistical informations about particle conditions
492	IF ( write_particle_statistics ) THEN
493	CALL check_open( 80 )
494	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
495	number_of_particles, &
496	maximum_number_of_particles
497	CALL close_file( 80 )
498	ENDIF
499
500	!
501	!-- Check if particles are really uniform in color and radius (dvrp_size)
502	!-- (uniform_particles is preset TRUE)
503	IF ( uniform_particles ) THEN
504	DO ip = nxl, nxr
505	DO jp = nys, nyn
506	DO kp = nzb+1, nzt
507
508	n = prt_count(kp,jp,ip)
509	IF ( MINVAL( grid_particles(kp,jp,ip)%particles(1:n)%dvrp_psize ) == &
510	MAXVAL( grid_particles(kp,jp,ip)%particles(1:n)%dvrp_psize ) .AND. &
511	MINVAL( grid_particles(kp,jp,ip)%particles(1:n)%class ) == &
512	MAXVAL( grid_particles(kp,jp,ip)%particles(1:n)%class ) ) THEN
513	uniform_particles_l = .TRUE.
514	ELSE
515	uniform_particles_l = .FALSE.
516	ENDIF
517
518	ENDDO
519	ENDDO
520	ENDDO
521
522	#if defined( __parallel )
523	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
524	CALL MPI_ALLREDUCE( uniform_particles_l, uniform_particles, 1, &
525	MPI_LOGICAL, MPI_LAND, comm2d, ierr )
526	#else
527	uniform_particles = uniform_particles_l
528	#endif
529
530	ENDIF
531
532	!
533	!-- Particles will probably become none-uniform, if their size and color
534	!-- will be determined by flow variables
535	IF ( particle_color /= 'none' .OR. particle_dvrpsize /= 'none' ) THEN
536	uniform_particles = .FALSE.
537	ENDIF
538
539	! !kk Not implemented aft individual particle array fort every gridcell
540	! !
541	! !-- Set the beginning of the particle tails and their age
542	! IF ( use_particle_tails ) THEN
543	! !
544	! !-- Choose the maximum number of tails with respect to the maximum number
545	! !-- of particles and skip_particles_for_tail
546	! maximum_number_of_tails = maximum_number_of_particles / &
547	! skip_particles_for_tail
548	!
549	! !
550	! !-- Create a minimum number of tails in case that there is no tail
551	! !-- initially (otherwise, index errors will occur when adressing the
552	! !-- arrays below)
553	! IF ( maximum_number_of_tails == 0 ) maximum_number_of_tails = 10
554	!
555	! ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
556	! maximum_number_of_tails), &
557	! new_tail_id(maximum_number_of_tails), &
558	! tail_mask(maximum_number_of_tails) )
559	!
560	! particle_tail_coordinates = 0.0_wp
561	! minimum_tailpoint_distance = minimum_tailpoint_distance**2
562	! number_of_initial_tails = number_of_tails
563	!
564	! nn = 0
565	! DO n = 1, number_of_particles
566	! !
567	! !-- Only for those particles marked above with a provisional tail_id
568	! !-- tails will be created. Particles now get their final tail_id.
569	! IF ( particles(n)%tail_id /= 0 ) THEN
570	!
571	! nn = nn + 1
572	! particles(n)%tail_id = nn
573	!
574	! particle_tail_coordinates(1,1,nn) = particles(n)%x
575	! particle_tail_coordinates(1,2,nn) = particles(n)%y
576	! particle_tail_coordinates(1,3,nn) = particles(n)%z
577	! particle_tail_coordinates(1,4,nn) = particles(n)%class
578	! particles(n)%tailpoints = 1
579	! IF ( minimum_tailpoint_distance /= 0.0_wp ) THEN
580	! particle_tail_coordinates(2,1,nn) = particles(n)%x
581	! particle_tail_coordinates(2,2,nn) = particles(n)%y
582	! particle_tail_coordinates(2,3,nn) = particles(n)%z
583	! particle_tail_coordinates(2,4,nn) = particles(n)%class
584	! particle_tail_coordinates(1:2,5,nn) = 0.0_wp
585	! particles(n)%tailpoints = 2
586	! ENDIF
587	!
588	! ENDIF
589	! ENDDO
590	! ENDIF
591	!
592	! !
593	! !-- Plot initial positions of particles (only if particle advection is
594	! !-- switched on from the beginning of the simulation (t=0))
595	! IF ( particle_advection_start == 0.0_wp ) CALL data_output_dvrp
596
597	ENDIF
598
599	!
600	!-- To avoid programm abort, assign particles array to the local version of
601	!-- first grid cell
602	number_of_particles = prt_count(nzb+1,nys,nxl)
603	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
604
605	!
606	!-- Formats
607	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
608
609	END SUBROUTINE lpm_init
610
611	!------------------------------------------------------------------------------!
612	! Description:
613	! ------------
614	!> @todo Missing subroutine description.
615	!------------------------------------------------------------------------------!
616	SUBROUTINE lpm_create_particle (phase)
617
618	USE lpm_exchange_horiz_mod, &
619	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
620
621	USE lpm_pack_arrays_mod, &
622	ONLY: lpm_pack_all_arrays
623
624	IMPLICIT NONE
625
626	INTEGER(iwp) :: alloc_size !<
627	INTEGER(iwp) :: i !<
628	INTEGER(iwp) :: ip !<
629	INTEGER(iwp) :: j !<
630	INTEGER(iwp) :: jp !<
631	INTEGER(iwp) :: kp !<
632	INTEGER(iwp) :: loop_stride !<
633	INTEGER(iwp) :: n !<
634	INTEGER(iwp) :: new_size !<
635	INTEGER(iwp) :: nn !<
636
637	INTEGER(iwp), INTENT(IN) :: phase !<
638
639	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !<
640	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !<
641
642	LOGICAL :: first_stride !<
643
644	REAL(wp) :: pos_x !<
645	REAL(wp) :: pos_y !<
646	REAL(wp) :: pos_z !<
647
648	TYPE(particle_type),TARGET :: tmp_particle !<
649
650	!
651	!-- Calculate particle positions and store particle attributes, if
652	!-- particle is situated on this PE
653	DO loop_stride = 1, 2
654	first_stride = (loop_stride == 1)
655	IF ( first_stride ) THEN
656	local_count = 0 ! count number of particles
657	ELSE
658	local_count = prt_count ! Start address of new particles
659	ENDIF
660
661	n = 0
662	DO i = 1, number_of_particle_groups
663
664	pos_z = psb(i)
665
666	DO WHILE ( pos_z <= pst(i) )
667
668	pos_y = pss(i)
669
670	DO WHILE ( pos_y <= psn(i) )
671
672	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
673	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
674
675	pos_x = psl(i)
676
677	xloop: DO WHILE ( pos_x <= psr(i) )
678
679	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
680	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
681
682	DO j = 1, particles_per_point
683
684	n = n + 1
685	#if defined( __twocachelines )
686	tmp_particle%x = pos_x
687	tmp_particle%y = pos_y
688	tmp_particle%z = pos_z
689	tmp_particle%age = 0.0_sp
690	tmp_particle%age_m = 0.0_sp
691	tmp_particle%dt_sum = 0.0_wp
692	tmp_particle%dvrp_psize = dvrp_psize
693	tmp_particle%e_m = 0.0_sp
694	IF ( curvature_solution_effects ) THEN
695	!
696	!-- Initial values (internal timesteps, derivative)
697	!-- for Rosenbrock method
698	tmp_particle%rvar1 = 1.0E-12_wp
699	tmp_particle%rvar2 = 1.0E-3_wp
700	tmp_particle%rvar3 = -9999999.9_wp
701	ELSE
702	!
703	!-- Initial values for SGS velocities
704	tmp_particle%rvar1 = 0.0_wp
705	tmp_particle%rvar2 = 0.0_wp
706	tmp_particle%rvar3 = 0.0_wp
707	ENDIF
708	tmp_particle%speed_x = 0.0_sp
709	tmp_particle%speed_y = 0.0_sp
710	tmp_particle%speed_z = 0.0_sp
711	tmp_particle%origin_x = pos_x
712	tmp_particle%origin_y = pos_y
713	tmp_particle%origin_z = pos_z
714	tmp_particle%radius = particle_groups(i)%radius
715	tmp_particle%weight_factor = initial_weighting_factor
716	tmp_particle%class = 1
717	tmp_particle%group = i
718	tmp_particle%tailpoints = 0
719	tmp_particle%particle_mask = .TRUE.
720	#else
721	tmp_particle%x = pos_x
722	tmp_particle%y = pos_y
723	tmp_particle%z = pos_z
724	tmp_particle%age = 0.0_wp
725	tmp_particle%age_m = 0.0_wp
726	tmp_particle%dt_sum = 0.0_wp
727	tmp_particle%dvrp_psize = dvrp_psize
728	tmp_particle%e_m = 0.0_wp
729	IF ( curvature_solution_effects ) THEN
730	!
731	!-- Initial values (internal timesteps, derivative)
732	!-- for Rosenbrock method
733	tmp_particle%rvar1 = 1.0E-12_wp
734	tmp_particle%rvar2 = 1.0E-3_wp
735	tmp_particle%rvar3 = -9999999.9_wp
736	ELSE
737	!
738	!-- Initial values for SGS velocities
739	tmp_particle%rvar1 = 0.0_wp
740	tmp_particle%rvar2 = 0.0_wp
741	tmp_particle%rvar3 = 0.0_wp
742	ENDIF
743	tmp_particle%speed_x = 0.0_wp
744	tmp_particle%speed_y = 0.0_wp
745	tmp_particle%speed_z = 0.0_wp
746	tmp_particle%origin_x = pos_x
747	tmp_particle%origin_y = pos_y
748	tmp_particle%origin_z = pos_z
749	tmp_particle%radius = particle_groups(i)%radius
750	tmp_particle%weight_factor = initial_weighting_factor
751	tmp_particle%class = 1
752	tmp_particle%group = i
753	tmp_particle%tailpoints = 0
754	tmp_particle%particle_mask = .TRUE.
755	#endif
756	IF ( use_particle_tails .AND. &
757	MOD( n, skip_particles_for_tail ) == 0 ) THEN
758	number_of_tails = number_of_tails + 1
759	!
760	!-- This is a temporary provisional setting (see
761	!-- further below!)
762	tmp_particle%tail_id = number_of_tails
763	ELSE
764	tmp_particle%tail_id = 0
765	ENDIF
766	!
767	!-- Determine the grid indices of the particle position
768	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
769	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
770	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt
771
772	IF ( seed_follows_topography ) THEN
773	!
774	!-- Particle height is given relative to topography
775	kp = kp + nzb_w_inner(jp,ip)
776	tmp_particle%z = tmp_particle%z + zw(kp)
777	IF ( kp > nzt ) THEN
778	pos_x = pos_x + pdx(i)
779	CYCLE xloop
780	ENDIF
781	ENDIF
782
783	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
784	IF ( .NOT. first_stride ) THEN
785	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
786	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
787	ENDIF
788	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
789	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
790	ENDIF
791	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
792	ENDIF
793	ENDDO
794
795	ENDIF
796
797	pos_x = pos_x + pdx(i)
798
799	ENDDO xloop
800
801	ENDIF
802
803	pos_y = pos_y + pdy(i)
804
805	ENDDO
806
807	pos_z = pos_z + pdz(i)
808
809	ENDDO
810
811	ENDDO
812
813	IF ( first_stride ) THEN
814	DO ip = nxl, nxr
815	DO jp = nys, nyn
816	DO kp = nzb+1, nzt
817	IF ( phase == PHASE_INIT ) THEN
818	IF ( local_count(kp,jp,ip) > 0 ) THEN
819	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
820	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
821	min_nr_particle )
822	ELSE
823	alloc_size = min_nr_particle
824	ENDIF
825	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
826	DO n = 1, alloc_size
827	grid_particles(kp,jp,ip)%particles(n) = zero_particle
828	ENDDO
829	ELSEIF ( phase == PHASE_RELEASE ) THEN
830	IF ( local_count(kp,jp,ip) > 0 ) THEN
831	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
832	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
833	alloc_factor / 100.0_wp ) ), min_nr_particle )
834	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
835	CALL realloc_particles_array(ip,jp,kp,alloc_size)
836	ENDIF
837	ENDIF
838	ENDIF
839	ENDDO
840	ENDDO
841	ENDDO
842	ENDIF
843	ENDDO
844
845	local_start = prt_count+1
846	prt_count = local_count
847	!
848	!-- Add random fluctuation to particle positions
849	IF ( random_start_position ) THEN
850	DO ip = nxl, nxr
851	DO jp = nys, nyn
852	DO kp = nzb+1, nzt
853	number_of_particles = prt_count(kp,jp,ip)
854	IF ( number_of_particles <= 0 ) CYCLE
855	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
856
857	DO n = local_start(kp,jp,ip), number_of_particles !Move only new particles
858	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
859	particles(n)%x = particles(n)%x + &
860	( random_function( iran_part ) - 0.5_wp ) * &
861	pdx(particles(n)%group)
862	ENDIF
863	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
864	particles(n)%y = particles(n)%y + &
865	( random_function( iran_part ) - 0.5_wp ) * &
866	pdy(particles(n)%group)
867	ENDIF
868	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
869	particles(n)%z = particles(n)%z + &
870	( random_function( iran_part ) - 0.5_wp ) * &
871	pdz(particles(n)%group)
872	ENDIF
873	ENDDO
874	!
875	!-- Identify particles located outside the model domain
876	CALL lpm_boundary_conds( 'bottom/top' )
877	ENDDO
878	ENDDO
879	ENDDO
880	!
881	!-- Exchange particles between grid cells and processors
882	CALL lpm_move_particle
883	CALL lpm_exchange_horiz
884
885	ENDIF
886	!
887	!-- In case of random_start_position, delete particles identified by
888	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
889	!-- which is needed for a fast interpolation of the LES fields on the particle
890	!-- position.
891	CALL lpm_pack_all_arrays
892
893	!
894	!-- Determine maximum number of particles (i.e., all possible particles that
895	!-- have been allocated) and the current number of particles
896	DO ip = nxl, nxr
897	DO jp = nys, nyn
898	DO kp = nzb+1, nzt
899	maximum_number_of_particles = maximum_number_of_particles &
900	+ SIZE(grid_particles(kp,jp,ip)%particles)
901	number_of_particles = number_of_particles &
902	+ prt_count(kp,jp,ip)
903	ENDDO
904	ENDDO
905	ENDDO
906	!
907	!-- Calculate the number of particles and tails of the total domain
908	#if defined( __parallel )
909	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
910	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
911	MPI_INTEGER, MPI_SUM, comm2d, ierr )
912	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
913	CALL MPI_ALLREDUCE( number_of_tails, total_number_of_tails, 1, &
914	MPI_INTEGER, MPI_SUM, comm2d, ierr )
915	#else
916	total_number_of_particles = number_of_particles
917	total_number_of_tails = number_of_tails
918	#endif
919
920	RETURN
921
922	END SUBROUTINE lpm_create_particle
923
924	END MODULE lpm_init_mod

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