Home

Context Navigation

source: palm/trunk/SOURCE/lpm_init.f90 @ 2000

Last change on this file since 2000 was 2000, checked in by knoop, 8 years ago
Forced header and separation lines into 80 columns
Property svn:keywords set to `Id`
File size: 43.0 KB

Line
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
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2016 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	! Forced header and separation lines into 80 columns
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: lpm_init.f90 2000 2016-08-20 18:09:15Z knoop $
27	!
28	! 2016-06-09 16:25:25Z suehring
29	! Bugfix in determining initial particle height and grid index in case of
30	! seed_follows_topography.
31	! Bugfix concerning random positions, ensure that particles do not move more
32	! than one grid length.
33	! Bugfix logarithmic interpolation.
34	! Initial setting of sgs_wf_part.
35	!
36	! 1890 2016-04-22 08:52:11Z hoffmann
37	! Initialization of aerosol equilibrium radius not possible in supersaturated
38	! environments. Therefore, a maximum supersaturation of -1 % is assumed during
39	! initialization.
40	!
41	! 1873 2016-04-18 14:50:06Z maronga
42	! Module renamed (removed _mod
43
44	!
45	! 1871 2016-04-15 11:46:09Z hoffmann
46	! Initialization of aerosols added.
47	!
48	! 1850 2016-04-08 13:29:27Z maronga
49	! Module renamed
50	!
51	! 1831 2016-04-07 13:15:51Z hoffmann
52	! curvature_solution_effects moved to particle_attributes
53	!
54	! 1822 2016-04-07 07:49:42Z hoffmann
55	! Unused variables removed.
56	!
57	! 1783 2016-03-06 18:36:17Z raasch
58	! netcdf module added
59	!
60	! 1725 2015-11-17 13:01:51Z hoffmann
61	! Bugfix: Processor-dependent seed for random function is generated before it is
62	! used.
63	!
64	! 1691 2015-10-26 16:17:44Z maronga
65	! Renamed prandtl_layer to constant_flux_layer.
66	!
67	! 1685 2015-10-08 07:32:13Z raasch
68	! bugfix concerning vertical index offset in case of ocean
69	!
70	! 1682 2015-10-07 23:56:08Z knoop
71	! Code annotations made doxygen readable
72	!
73	! 1575 2015-03-27 09:56:27Z raasch
74	! initial vertical particle position is allowed to follow the topography
75	!
76	! 1359 2014-04-11 17:15:14Z hoffmann
77	! New particle structure integrated.
78	! Kind definition added to all floating point numbers.
79	! lpm_init changed form a subroutine to a module.
80	!
81	! 1327 2014-03-21 11:00:16Z raasch
82	! -netcdf_output
83	!
84	! 1322 2014-03-20 16:38:49Z raasch
85	! REAL functions provided with KIND-attribute
86	!
87	! 1320 2014-03-20 08:40:49Z raasch
88	! ONLY-attribute added to USE-statements,
89	! kind-parameters added to all INTEGER and REAL declaration statements,
90	! kinds are defined in new module kinds,
91	! revision history before 2012 removed,
92	! comment fields (!:) to be used for variable explanations added to
93	! all variable declaration statements
94	! bugfix: #if defined( __parallel ) added
95	!
96	! 1314 2014-03-14 18:25:17Z suehring
97	! Vertical logarithmic interpolation of horizontal particle speed for particles
98	! between roughness height and first vertical grid level.
99	!
100	! 1092 2013-02-02 11:24:22Z raasch
101	! unused variables removed
102	!
103	! 1036 2012-10-22 13:43:42Z raasch
104	! code put under GPL (PALM 3.9)
105	!
106	! 849 2012-03-15 10:35:09Z raasch
107	! routine renamed: init_particles -> lpm_init
108	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
109	! advec_particles),
110	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
111	!
112	! 828 2012-02-21 12:00:36Z raasch
113	! call of init_kernels, particle feature color renamed class
114	!
115	! 824 2012-02-17 09:09:57Z raasch
116	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
117	! array particles implemented as pointer
118	!
119	! 667 2010-12-23 12:06:00Z suehring/gryschka
120	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
121	! of arrays.
122	!
123	! Revision 1.1 1999/11/25 16:22:38 raasch
124	! Initial revision
125	!
126	!
127	! Description:
128	! ------------
129	!> This routine initializes a set of particles and their attributes (position,
130	!> radius, ..) which are used by the Lagrangian particle model (see lpm).
131	!------------------------------------------------------------------------------!
132	MODULE lpm_init_mod
133
134
135	USE arrays_3d, &
136	ONLY: de_dx, de_dy, de_dz, zu, zw, z0
137
138	USE control_parameters, &
139	ONLY: cloud_droplets, constant_flux_layer, current_timestep_number, &
140	dz, initializing_actions, message_string, ocean, simulated_time
141
142	USE grid_variables, &
143	ONLY: ddx, dx, ddy, dy
144
145	USE indices, &
146	ONLY: nx, nxl, nxlg, nxrg, nxr, ny, nyn, nys, nyng, nysg, nz, nzb, &
147	nzb_w_inner, nzt
148
149	USE kinds
150
151	USE lpm_collision_kernels_mod, &
152	ONLY: init_kernels
153
154	USE netcdf_interface, &
155	ONLY: netcdf_data_format
156
157	USE particle_attributes, &
158	ONLY: alloc_factor, bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
159	block_offset, block_offset_def, collision_kernel, &
160	curvature_solution_effects, &
161	density_ratio, grid_particles, &
162	initial_weighting_factor, ibc_par_b, ibc_par_lr, ibc_par_ns, &
163	ibc_par_t, iran_part, log_z_z0, &
164	max_number_of_particle_groups, maximum_number_of_particles, &
165	min_nr_particle, mpi_particle_type, &
166	number_of_particles, &
167	number_of_particle_groups, number_of_sublayers, &
168	offset_ocean_nzt, offset_ocean_nzt_m1, &
169	particles, particle_advection_start, particle_groups, &
170	particle_groups_type, particles_per_point, &
171	particle_type, pdx, pdy, pdz, &
172	prt_count, psb, psl, psn, psr, pss, pst, &
173	radius, random_start_position, read_particles_from_restartfile,&
174	seed_follows_topography, sgs_wf_part, sort_count, &
175	total_number_of_particles, &
176	use_sgs_for_particles, &
177	write_particle_statistics, uniform_particles, zero_particle, &
178	z0_av_global
179
180	USE pegrid
181
182	USE random_function_mod, &
183	ONLY: random_function
184
185	IMPLICIT NONE
186
187	PRIVATE
188
189	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !<
190	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !<
191
192	INTERFACE lpm_init
193	MODULE PROCEDURE lpm_init
194	END INTERFACE lpm_init
195
196	INTERFACE lpm_create_particle
197	MODULE PROCEDURE lpm_create_particle
198	END INTERFACE lpm_create_particle
199
200	PUBLIC lpm_init, lpm_create_particle
201
202	CONTAINS
203
204	!------------------------------------------------------------------------------!
205	! Description:
206	! ------------
207	!> @todo Missing subroutine description.
208	!------------------------------------------------------------------------------!
209	SUBROUTINE lpm_init
210
211	USE lpm_collision_kernels_mod, &
212	ONLY: init_kernels
213
214	IMPLICIT NONE
215
216	INTEGER(iwp) :: i !<
217	INTEGER(iwp) :: j !<
218	INTEGER(iwp) :: k !<
219
220	#if defined( __parallel )
221	INTEGER(iwp), DIMENSION(3) :: blocklengths !<
222	INTEGER(iwp), DIMENSION(3) :: displacements !<
223	INTEGER(iwp), DIMENSION(3) :: types !<
224	#endif
225
226	REAL(wp) :: height_int !<
227	REAL(wp) :: height_p !<
228	REAL(wp) :: z_p !<
229	REAL(wp) :: z0_av_local !<
230
231	#if defined( __parallel )
232	!
233	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
234	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
235	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
236	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
237
238	types(1) = MPI_REAL
239	types(2) = MPI_INTEGER
240	types(3) = MPI_UB
241	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
242	mpi_particle_type, ierr )
243	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
244	#endif
245
246	!
247	!-- In case of oceans runs, the vertical index calculations need an offset,
248	!-- because otherwise the k indices will become negative
249	IF ( ocean ) THEN
250	offset_ocean_nzt = nzt
251	offset_ocean_nzt_m1 = nzt - 1
252	ENDIF
253
254	!
255	!-- Define block offsets for dividing a gridcell in 8 sub cells
256
257	block_offset(0) = block_offset_def (-1,-1,-1)
258	block_offset(1) = block_offset_def (-1,-1, 0)
259	block_offset(2) = block_offset_def (-1, 0,-1)
260	block_offset(3) = block_offset_def (-1, 0, 0)
261	block_offset(4) = block_offset_def ( 0,-1,-1)
262	block_offset(5) = block_offset_def ( 0,-1, 0)
263	block_offset(6) = block_offset_def ( 0, 0,-1)
264	block_offset(7) = block_offset_def ( 0, 0, 0)
265	!
266	!-- Check the number of particle groups.
267	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
268	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
269	max_number_of_particle_groups , &
270	'&number_of_particle_groups reset to ', &
271	max_number_of_particle_groups
272	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
273	number_of_particle_groups = max_number_of_particle_groups
274	ENDIF
275
276	!
277	!-- Set default start positions, if necessary
278	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
279	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
280	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
281	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
282	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
283	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
284
285	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
286	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
287	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
288
289	DO j = 2, number_of_particle_groups
290	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
291	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
292	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
293	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
294	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
295	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
296	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
297	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
298	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
299	ENDDO
300
301	!
302	!-- Allocate arrays required for calculating particle SGS velocities.
303	!-- Initialize prefactor required for stoachastic Weil equation.
304	IF ( use_sgs_for_particles .AND. .NOT. cloud_droplets ) THEN
305	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
306	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
307	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
308
309	sgs_wf_part = 1.0_wp / 3.0_wp
310	ENDIF
311
312	!
313	!-- Allocate array required for logarithmic vertical interpolation of
314	!-- horizontal particle velocities between the surface and the first vertical
315	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
316	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
317	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
318	!-- To obtain exact height levels of particles, linear interpolation is applied
319	!-- (see lpm_advec.f90).
320	IF ( constant_flux_layer ) THEN
321
322	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
323	z_p = zu(nzb+1) - zw(nzb)
324
325	!
326	!-- Calculate horizontal mean value of z0 used for logartihmic
327	!-- interpolation. Note: this is not exact for heterogeneous z0.
328	!-- However, sensitivity studies showed that the effect is
329	!-- negligible.
330	z0_av_local = SUM( z0(nys:nyn,nxl:nxr) )
331	z0_av_global = 0.0_wp
332
333	#if defined( __parallel )
334	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
335	comm2d, ierr )
336	#else
337	z0_av_global = z0_av_local
338	#endif
339
340	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
341	!
342	!-- Horizontal wind speed is zero below and at z0
343	log_z_z0(0) = 0.0_wp
344	!
345	!-- Calculate vertical depth of the sublayers
346	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
347	!
348	!-- Precalculate LOG(z/z0)
349	height_p = z0_av_global
350	DO k = 1, number_of_sublayers
351
352	height_p = height_p + height_int
353	log_z_z0(k) = LOG( height_p / z0_av_global )
354
355	ENDDO
356
357	ENDIF
358
359	!
360	!-- Check boundary condition and set internal variables
361	SELECT CASE ( bc_par_b )
362
363	CASE ( 'absorb' )
364	ibc_par_b = 1
365
366	CASE ( 'reflect' )
367	ibc_par_b = 2
368
369	CASE DEFAULT
370	WRITE( message_string, * ) 'unknown boundary condition ', &
371	'bc_par_b = "', TRIM( bc_par_b ), '"'
372	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
373
374	END SELECT
375	SELECT CASE ( bc_par_t )
376
377	CASE ( 'absorb' )
378	ibc_par_t = 1
379
380	CASE ( 'reflect' )
381	ibc_par_t = 2
382
383	CASE DEFAULT
384	WRITE( message_string, * ) 'unknown boundary condition ', &
385	'bc_par_t = "', TRIM( bc_par_t ), '"'
386	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
387
388	END SELECT
389	SELECT CASE ( bc_par_lr )
390
391	CASE ( 'cyclic' )
392	ibc_par_lr = 0
393
394	CASE ( 'absorb' )
395	ibc_par_lr = 1
396
397	CASE ( 'reflect' )
398	ibc_par_lr = 2
399
400	CASE DEFAULT
401	WRITE( message_string, * ) 'unknown boundary condition ', &
402	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
403	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
404
405	END SELECT
406	SELECT CASE ( bc_par_ns )
407
408	CASE ( 'cyclic' )
409	ibc_par_ns = 0
410
411	CASE ( 'absorb' )
412	ibc_par_ns = 1
413
414	CASE ( 'reflect' )
415	ibc_par_ns = 2
416
417	CASE DEFAULT
418	WRITE( message_string, * ) 'unknown boundary condition ', &
419	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
420	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
421
422	END SELECT
423
424	!
425	!-- Initialize collision kernels
426	IF ( collision_kernel /= 'none' ) CALL init_kernels
427
428	!
429	!-- For the first model run of a possible job chain initialize the
430	!-- particles, otherwise read the particle data from restart file.
431	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
432	.AND. read_particles_from_restartfile ) THEN
433
434	CALL lpm_read_restart_file
435
436	ELSE
437
438	!
439	!-- Allocate particle arrays and set attributes of the initial set of
440	!-- particles, which can be also periodically released at later times.
441	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
442	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
443
444	maximum_number_of_particles = 0
445	number_of_particles = 0
446
447	sort_count = 0
448	prt_count = 0
449
450	!
451	!-- Initialize all particles with dummy values (otherwise errors may
452	!-- occur within restart runs). The reason for this is still not clear
453	!-- and may be presumably caused by errors in the respective user-interface.
454	zero_particle = particle_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
455	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
456	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
457	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0, 0, 0, &
458	0, .FALSE., -1 )
459
460	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
461
462	!
463	!-- Set values for the density ratio and radius for all particle
464	!-- groups, if necessary
465	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
466	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
467	DO i = 2, number_of_particle_groups
468	IF ( density_ratio(i) == 9999999.9_wp ) THEN
469	density_ratio(i) = density_ratio(i-1)
470	ENDIF
471	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
472	ENDDO
473
474	DO i = 1, number_of_particle_groups
475	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
476	WRITE( message_string, * ) 'particle group #', i, 'has a', &
477	'density ratio /= 0 but radius = 0'
478	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
479	ENDIF
480	particle_groups(i)%density_ratio = density_ratio(i)
481	particle_groups(i)%radius = radius(i)
482	ENDDO
483
484	!
485	!-- Set a seed value for the random number generator to be exclusively
486	!-- used for the particle code. The generated random numbers should be
487	!-- different on the different PEs.
488	iran_part = iran_part + myid
489
490	CALL lpm_create_particle (PHASE_INIT)
491	!
492	!-- User modification of initial particles
493	CALL user_lpm_init
494
495	!
496	!-- Open file for statistical informations about particle conditions
497	IF ( write_particle_statistics ) THEN
498	CALL check_open( 80 )
499	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
500	number_of_particles, &
501	maximum_number_of_particles
502	CALL close_file( 80 )
503	ENDIF
504
505	ENDIF
506
507	!
508	!-- To avoid programm abort, assign particles array to the local version of
509	!-- first grid cell
510	number_of_particles = prt_count(nzb+1,nys,nxl)
511	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
512	!
513	!-- Formats
514	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
515
516	END SUBROUTINE lpm_init
517
518	!------------------------------------------------------------------------------!
519	! Description:
520	! ------------
521	!> @todo Missing subroutine description.
522	!------------------------------------------------------------------------------!
523	SUBROUTINE lpm_create_particle (phase)
524
525	USE lpm_exchange_horiz_mod, &
526	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
527
528	USE lpm_pack_arrays_mod, &
529	ONLY: lpm_pack_all_arrays
530
531	USE particle_attributes, &
532	ONLY: deleted_particles, monodisperse_aerosols
533
534	IMPLICIT NONE
535
536	INTEGER(iwp) :: alloc_size !< relative increase of allocated memory for particles
537	INTEGER(iwp) :: i !< loop variable ( particle groups )
538	INTEGER(iwp) :: ip !< index variable along x
539	INTEGER(iwp) :: j !< loop variable ( particles per point )
540	INTEGER(iwp) :: jp !< index variable along y
541	INTEGER(iwp) :: kp !< index variable along z
542	INTEGER(iwp) :: loop_stride !< loop variable for initialization
543	INTEGER(iwp) :: n !< loop variable ( number of particles )
544	INTEGER(iwp) :: new_size !< new size of allocated memory for particles
545
546	INTEGER(iwp), INTENT(IN) :: phase !< mode of inititialization
547
548	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !< start address of new particle
549	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !< start address of new particle
550
551	LOGICAL :: first_stride !< flag for initialization
552
553	REAL(wp) :: pos_x !< increment for particle position in x
554	REAL(wp) :: pos_y !< increment for particle position in y
555	REAL(wp) :: pos_z !< increment for particle position in z
556	REAL(wp) :: rand_contr !< dummy argument for random position
557
558	TYPE(particle_type),TARGET :: tmp_particle !< temporary particle used for initialization
559
560	!
561	!-- Calculate particle positions and store particle attributes, if
562	!-- particle is situated on this PE
563	DO loop_stride = 1, 2
564	first_stride = (loop_stride == 1)
565	IF ( first_stride ) THEN
566	local_count = 0 ! count number of particles
567	ELSE
568	local_count = prt_count ! Start address of new particles
569	ENDIF
570
571	n = 0
572	DO i = 1, number_of_particle_groups
573
574	pos_z = psb(i)
575
576	DO WHILE ( pos_z <= pst(i) )
577
578	pos_y = pss(i)
579
580	DO WHILE ( pos_y <= psn(i) )
581
582	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
583	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
584
585	pos_x = psl(i)
586
587	xloop: DO WHILE ( pos_x <= psr(i) )
588
589	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
590	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
591
592	DO j = 1, particles_per_point
593
594	n = n + 1
595	tmp_particle%x = pos_x
596	tmp_particle%y = pos_y
597	tmp_particle%z = pos_z
598	tmp_particle%age = 0.0_wp
599	tmp_particle%age_m = 0.0_wp
600	tmp_particle%dt_sum = 0.0_wp
601	tmp_particle%dvrp_psize = 0.0_wp !unused
602	tmp_particle%e_m = 0.0_wp
603	IF ( curvature_solution_effects ) THEN
604	!
605	!-- Initial values (internal timesteps, derivative)
606	!-- for Rosenbrock method
607	tmp_particle%rvar1 = 1.0E-6_wp !last Rosenbrock timestep
608	tmp_particle%rvar2 = 0.1E-6_wp !dry aerosol radius
609	tmp_particle%rvar3 = -9999999.9_wp !unused
610	ELSE
611	!
612	!-- Initial values for SGS velocities
613	tmp_particle%rvar1 = 0.0_wp
614	tmp_particle%rvar2 = 0.0_wp
615	tmp_particle%rvar3 = 0.0_wp
616	ENDIF
617	tmp_particle%speed_x = 0.0_wp
618	tmp_particle%speed_y = 0.0_wp
619	tmp_particle%speed_z = 0.0_wp
620	tmp_particle%origin_x = pos_x
621	tmp_particle%origin_y = pos_y
622	tmp_particle%origin_z = pos_z
623	tmp_particle%radius = particle_groups(i)%radius
624	tmp_particle%weight_factor = initial_weighting_factor
625	tmp_particle%class = 1
626	tmp_particle%group = i
627	tmp_particle%tailpoints = 0 !unused
628	tmp_particle%particle_mask = .TRUE.
629	tmp_particle%tail_id = 0 !unused
630
631
632	!
633	!-- Determine the grid indices of the particle position
634	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
635	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
636	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt
637
638	IF ( seed_follows_topography ) THEN
639	!
640	!-- Particle height is given relative to topography
641	kp = kp + nzb_w_inner(jp,ip)
642	tmp_particle%z = tmp_particle%z + &
643	zw(nzb_w_inner(jp,ip))
644	IF ( kp > nzt ) THEN
645	pos_x = pos_x + pdx(i)
646	CYCLE xloop
647	ENDIF
648	ELSEIF ( .NOT. seed_follows_topography .AND. &
649	tmp_particle%z <= zw(nzb_w_inner(jp,ip)) ) THEN
650	pos_x = pos_x + pdx(i)
651	CYCLE xloop
652	ENDIF
653
654	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
655	IF ( .NOT. first_stride ) THEN
656	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
657	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
658	ENDIF
659	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
660	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
661	ENDIF
662	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
663
664	ENDIF
665	ENDDO
666
667	ENDIF
668
669	pos_x = pos_x + pdx(i)
670
671	ENDDO xloop
672
673	ENDIF
674
675	pos_y = pos_y + pdy(i)
676
677	ENDDO
678
679	pos_z = pos_z + pdz(i)
680
681	ENDDO
682
683	ENDDO
684
685	IF ( first_stride ) THEN
686	DO ip = nxl, nxr
687	DO jp = nys, nyn
688	DO kp = nzb+1, nzt
689	IF ( phase == PHASE_INIT ) THEN
690	IF ( local_count(kp,jp,ip) > 0 ) THEN
691	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
692	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
693	min_nr_particle )
694	ELSE
695	alloc_size = min_nr_particle
696	ENDIF
697	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
698	DO n = 1, alloc_size
699	grid_particles(kp,jp,ip)%particles(n) = zero_particle
700	ENDDO
701	ELSEIF ( phase == PHASE_RELEASE ) THEN
702	IF ( local_count(kp,jp,ip) > 0 ) THEN
703	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
704	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
705	alloc_factor / 100.0_wp ) ), min_nr_particle )
706	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
707	CALL realloc_particles_array(ip,jp,kp,alloc_size)
708	ENDIF
709	ENDIF
710	ENDIF
711
712	ENDDO
713	ENDDO
714	ENDDO
715	ENDIF
716
717	ENDDO
718
719	local_start = prt_count+1
720	prt_count = local_count
721
722	!
723	!-- Initialize aerosol background spectrum
724	IF ( curvature_solution_effects .AND. .NOT. monodisperse_aerosols ) THEN
725	CALL lpm_init_aerosols(local_start)
726	ENDIF
727
728	!
729	!-- Add random fluctuation to particle positions.
730	IF ( random_start_position ) THEN
731	DO ip = nxl, nxr
732	DO jp = nys, nyn
733	DO kp = nzb+1, nzt
734	number_of_particles = prt_count(kp,jp,ip)
735	IF ( number_of_particles <= 0 ) CYCLE
736	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
737	!
738	!-- Move only new particles. Moreover, limit random fluctuation
739	!-- in order to prevent that particles move more than one grid box,
740	!-- which would lead to problems concerning particle exchange
741	!-- between processors in case pdx/pdy are larger than dx/dy,
742	!-- respectively.
743	DO n = local_start(kp,jp,ip), number_of_particles
744	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
745	rand_contr = ( random_function( iran_part ) - 0.5_wp ) * &
746	pdx(particles(n)%group)
747	particles(n)%x = particles(n)%x + &
748	MERGE( rand_contr, SIGN( dx, rand_contr ), &
749	ABS( rand_contr ) < dx &
750	)
751	ENDIF
752	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
753	rand_contr = ( random_function( iran_part ) - 0.5_wp ) * &
754	pdy(particles(n)%group)
755	particles(n)%y = particles(n)%y + &
756	MERGE( rand_contr, SIGN( dy, rand_contr ), &
757	ABS( rand_contr ) < dy &
758	)
759	ENDIF
760	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
761	rand_contr = ( random_function( iran_part ) - 0.5_wp ) * &
762	pdz(particles(n)%group)
763	particles(n)%z = particles(n)%z + &
764	MERGE( rand_contr, SIGN( dz, rand_contr ), &
765	ABS( rand_contr ) < dz &
766	)
767	ENDIF
768	ENDDO
769	!
770	!-- Identify particles located outside the model domain and reflect
771	!-- or absorb them if necessary.
772	CALL lpm_boundary_conds( 'bottom/top' )
773	!
774	!-- Furthermore, remove particles located in topography. Note, as
775	!-- the particle speed is still zero at this point, wall
776	!-- reflection boundary conditions will not work in this case.
777	particles => &
778	grid_particles(kp,jp,ip)%particles(1:number_of_particles)
779	DO n = local_start(kp,jp,ip), number_of_particles
780	i = ( particles(n)%x + 0.5_wp * dx ) * ddx
781	j = ( particles(n)%y + 0.5_wp * dy ) * ddy
782	IF ( particles(n)%z <= zw(nzb_w_inner(j,i)) ) THEN
783	particles(n)%particle_mask = .FALSE.
784	deleted_particles = deleted_particles + 1
785	ENDIF
786	ENDDO
787	ENDDO
788	ENDDO
789	ENDDO
790	!
791	!-- Exchange particles between grid cells and processors
792	CALL lpm_move_particle
793	CALL lpm_exchange_horiz
794
795	ENDIF
796	!
797	!-- In case of random_start_position, delete particles identified by
798	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
799	!-- which is needed for a fast interpolation of the LES fields on the particle
800	!-- position.
801	CALL lpm_pack_all_arrays
802
803	!
804	!-- Determine maximum number of particles (i.e., all possible particles that
805	!-- have been allocated) and the current number of particles
806	DO ip = nxl, nxr
807	DO jp = nys, nyn
808	DO kp = nzb+1, nzt
809	maximum_number_of_particles = maximum_number_of_particles &
810	+ SIZE(grid_particles(kp,jp,ip)%particles)
811	number_of_particles = number_of_particles &
812	+ prt_count(kp,jp,ip)
813	ENDDO
814	ENDDO
815	ENDDO
816	!
817	!-- Calculate the number of particles of the total domain
818	#if defined( __parallel )
819	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
820	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
821	MPI_INTEGER, MPI_SUM, comm2d, ierr )
822	#else
823	total_number_of_particles = number_of_particles
824	#endif
825
826	RETURN
827
828	END SUBROUTINE lpm_create_particle
829
830	SUBROUTINE lpm_init_aerosols(local_start)
831
832	USE arrays_3d, &
833	ONLY: hyp, pt, q
834
835	USE cloud_parameters, &
836	ONLY: l_d_rv, rho_l
837
838	USE constants, &
839	ONLY: pi
840
841	USE kinds
842
843	USE particle_attributes, &
844	ONLY: init_aerosol_probabilistic, molecular_weight_of_solute, &
845	molecular_weight_of_water, n1, n2, n3, rho_s, rm1, rm2, rm3, &
846	s1, s2, s3, vanthoff
847
848	IMPLICIT NONE
849
850	REAL(wp), DIMENSION(:), ALLOCATABLE :: cdf !< CDF of aerosol spectrum
851	REAL(wp), DIMENSION(:), ALLOCATABLE :: r_temp !< dry aerosol radius spectrum
852
853	REAL(wp) :: bfactor !< solute effects
854	REAL(wp) :: dr !< width of radius bin
855	REAL(wp) :: e_a !< vapor pressure
856	REAL(wp) :: e_s !< saturation vapor pressure
857	REAL(wp) :: n_init !< sum of all aerosol concentrations
858	REAL(wp) :: pdf !< PDF of aerosol spectrum
859	REAL(wp) :: rmin = 1.0e-8_wp !< minimum aerosol radius
860	REAL(wp) :: rmax = 1.0e-6_wp !< maximum aerosol radius
861	REAL(wp) :: rs_rand !< random number
862	REAL(wp) :: r_mid !< mean radius
863	REAL(wp) :: t_int !< temperature
864	REAL(wp) :: weight_sum !< sum of all weighting factors
865
866	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg), INTENT(IN) :: local_start !<
867
868	INTEGER(iwp) :: n !<
869	INTEGER(iwp) :: nn !<
870	INTEGER(iwp) :: no_bins = 999 !< number of bins
871	INTEGER(iwp) :: ip !<
872	INTEGER(iwp) :: jp !<
873	INTEGER(iwp) :: kp !<
874
875	LOGICAL :: new_pdf = .FALSE. !< check if aerosol PDF has to be recalculated
876
877	!
878	!-- Compute aerosol background distribution
879	IF ( init_aerosol_probabilistic ) THEN
880	ALLOCATE( cdf(0:no_bins), r_temp(0:no_bins) )
881	DO n = 0, no_bins
882	r_temp(n) = EXP( LOG(rmin) + ( LOG(rmax) - LOG(rmin ) ) / &
883	REAL(no_bins, KIND=wp) * REAL(n, KIND=wp) )
884
885	cdf(n) = 0.0_wp
886	n_init = n1 + n2 + n3
887	IF ( n1 > 0.0_wp ) THEN
888	cdf(n) = cdf(n) + n1 / n_init * ( 0.5_wp + 0.5_wp * &
889	ERF( LOG( r_temp(n) / rm1 ) / &
890	( SQRT(2.0_wp) * LOG(s1) ) &
891	) )
892	ENDIF
893	IF ( n2 > 0.0_wp ) THEN
894	cdf(n) = cdf(n) + n2 / n_init * ( 0.5_wp + 0.5_wp * &
895	ERF( LOG( r_temp(n) / rm2 ) / &
896	( SQRT(2.0_wp) * LOG(s2) ) &
897	) )
898	ENDIF
899	IF ( n3 > 0.0_wp ) THEN
900	cdf(n) = cdf(n) + n3 / n_init * ( 0.5_wp + 0.5_wp * &
901	ERF( LOG( r_temp(n) / rm3 ) / &
902	( SQRT(2.0_wp) * LOG(s3) ) &
903	) )
904	ENDIF
905
906	ENDDO
907	ENDIF
908
909	DO ip = nxl, nxr
910	DO jp = nys, nyn
911	DO kp = nzb+1, nzt
912
913	number_of_particles = prt_count(kp,jp,ip)
914	IF ( number_of_particles <= 0 ) CYCLE
915	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
916	!
917	!-- Initialize the aerosols with a predefined spectral distribution
918	!-- of the dry radius (logarithmically increasing bins) and a varying
919	!-- weighting factor
920	IF ( .NOT. init_aerosol_probabilistic ) THEN
921
922	new_pdf = .FALSE.
923	IF ( .NOT. ALLOCATED( r_temp ) ) THEN
924	new_pdf = .TRUE.
925	ELSE
926	IF ( SIZE( r_temp ) .NE. &
927	number_of_particles - local_start(kp,jp,ip) + 2 ) THEN
928	new_pdf = .TRUE.
929	DEALLOCATE( r_temp )
930	ENDIF
931	ENDIF
932
933	IF ( new_pdf ) THEN
934
935	no_bins = number_of_particles + 1 - local_start(kp,jp,ip)
936	ALLOCATE( r_temp(0:no_bins) )
937
938	DO n = 0, no_bins
939	r_temp(n) = EXP( LOG(rmin) + ( LOG(rmax) - LOG(rmin ) ) / &
940	REAL(no_bins, KIND=wp) * &
941	REAL(n, KIND=wp) )
942	ENDDO
943
944	ENDIF
945
946	!
947	!-- Calculate radius and concentration of each aerosol
948	DO n = local_start(kp,jp,ip), number_of_particles
949
950	nn = n - local_start(kp,jp,ip)
951
952	r_mid = SQRT( r_temp(nn) * r_temp(nn+1) )
953	dr = r_temp(nn+1) - r_temp(nn)
954
955	pdf = 0.0_wp
956	n_init = n1 + n2 + n3
957	IF ( n1 > 0.0_wp ) THEN
958	pdf = pdf + n1 / n_init * ( 1.0_wp / ( r_mid * LOG(s1) * &
959	SQRT( 2.0_wp * pi ) &
960	) * &
961	EXP( -( LOG( r_mid / rm1 ) )**2 / &
962	( 2.0_wp * LOG(s1)**2 ) &
963	) &
964	)
965	ENDIF
966	IF ( n2 > 0.0_wp ) THEN
967	pdf = pdf + n2 / n_init * ( 1.0_wp / ( r_mid * LOG(s2) * &
968	SQRT( 2.0_wp * pi ) &
969	) * &
970	EXP( -( LOG( r_mid / rm2 ) )**2 / &
971	( 2.0_wp * LOG(s2)**2 ) &
972	) &
973	)
974	ENDIF
975	IF ( n3 > 0.0_wp ) THEN
976	pdf = pdf + n3 / n_init * ( 1.0_wp / ( r_mid * LOG(s3) * &
977	SQRT( 2.0_wp * pi ) &
978	) * &
979	EXP( -( LOG( r_mid / rm3 ) )**2 / &
980	( 2.0_wp * LOG(s3)**2 ) &
981	) &
982	)
983	ENDIF
984
985	particles(n)%rvar2 = r_mid
986	particles(n)%weight_factor = pdf * dr
987
988	END DO
989	!
990	!-- Adjust weighting factors to initialize the same number of aerosols
991	!-- in every grid box
992	weight_sum = SUM(particles(local_start(kp,jp,ip):number_of_particles)%weight_factor)
993
994	particles(local_start(kp,jp,ip):number_of_particles)%weight_factor = &
995	particles(local_start(kp,jp,ip):number_of_particles)%weight_factor / &
996	weight_sum * initial_weighting_factor * ( no_bins + 1 )
997
998	ENDIF
999	!
1000	!-- Initialize the aerosols with a predefined weighting factor but
1001	!-- a randomly choosen dry radius
1002	IF ( init_aerosol_probabilistic ) THEN
1003
1004	DO n = local_start(kp,jp,ip), number_of_particles !only new particles
1005
1006	rs_rand = -1.0_wp
1007	DO WHILE ( rs_rand .LT. cdf(0) .OR. rs_rand .GE. cdf(no_bins) )
1008	rs_rand = random_function( iran_part )
1009	ENDDO
1010	!
1011	!-- Determine aerosol dry radius by a random number generator
1012	DO nn = 0, no_bins-1
1013	IF ( cdf(nn) .LE. rs_rand .AND. cdf(nn+1) .GT. rs_rand ) THEN
1014	particles(n)%rvar2 = r_temp(nn) + ( r_temp(nn+1) - r_temp(nn) ) / &
1015	( cdf(nn+1) - cdf(nn) ) * ( rs_rand - cdf(nn) )
1016	EXIT
1017	ENDIF
1018	ENDDO
1019
1020	ENDDO
1021
1022	ENDIF
1023
1024	!
1025	!-- Set particle radius to equilibrium radius based on the environmental
1026	!-- supersaturation (Khvorostyanov and Curry, 2007, JGR). This avoids
1027	!-- the sometimes lengthy growth toward their equilibrium radius within
1028	!-- the simulation.
1029	t_int = pt(kp,jp,ip) * ( hyp(kp) / 100000.0_wp )**0.286_wp
1030
1031	e_s = 611.0_wp * EXP( l_d_rv * ( 3.6609E-3_wp - 1.0_wp / t_int ) )
1032	e_a = q(kp,jp,ip) * hyp(kp) / ( 0.378_wp * q(kp,jp,ip) + 0.622_wp )
1033
1034	!
1035	!-- The formula is only valid for subsaturated environments. For
1036	!-- supersaturations higher than -1 %, the supersaturation is set to -1%.
1037	IF ( e_a / e_s < 0.99_wp ) THEN
1038
1039	DO n = local_start(kp,jp,ip), number_of_particles !only new particles
1040
1041	bfactor = vanthoff * molecular_weight_of_water * &
1042	rho_s * particles(n)%rvar2**3 / &
1043	( molecular_weight_of_solute * rho_l )
1044	particles(n)%radius = particles(n)%rvar2 * ( bfactor / &
1045	particles(n)%rvar23 )(1.0_wp/3.0_wp) *&
1046	( 1.0_wp - e_a / e_s )**(-1.0_wp/3.0_wp)
1047
1048	ENDDO
1049
1050	ELSE
1051
1052	DO n = local_start(kp,jp,ip), number_of_particles !only new particles
1053
1054	bfactor = vanthoff * molecular_weight_of_water * &
1055	rho_s * particles(n)%rvar2**3 / &
1056	( molecular_weight_of_solute * rho_l )
1057	particles(n)%radius = particles(n)%rvar2 * ( bfactor / &
1058	particles(n)%rvar23 )(1.0_wp/3.0_wp) *&
1059	0.01_wp**(-1.0_wp/3.0_wp)
1060
1061	ENDDO
1062
1063	ENDIF
1064
1065	ENDDO
1066	ENDDO
1067	ENDDO
1068	!
1069	!-- Deallocate used arrays
1070	IF ( ALLOCATED(r_temp) ) DEALLOCATE( r_temp )
1071	IF ( ALLOCATED(cdf) ) DEALLOCATE( cdf )
1072
1073	END SUBROUTINE lpm_init_aerosols
1074
1075	END MODULE lpm_init_mod

Note: See TracBrowser for help on using the repository browser.

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |