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source: palm/trunk/SOURCE/init_particles.f90 @ 826

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1	SUBROUTINE init_particles
2
3	!------------------------------------------------------------------------------!
4	! Current revisions:
5	! -----------------
6	!
7	!
8	! Former revisions:
9	! -----------------
10	! $Id: init_particles.f90 826 2012-02-19 03:41:34Z raasch $
11	!
12	! 824 2012-02-17 09:09:57Z raasch
13	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
14	! array particles implemented as pointer
15	!
16	! 667 2010-12-23 12:06:00Z suehring/gryschka
17	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
18	! of arrays.
19	!
20	! 622 2010-12-10 08:08:13Z raasch
21	! optional barriers included in order to speed up collective operations
22	!
23	! 336 2009-06-10 11:19:35Z raasch
24	! Maximum number of tails is calculated from maximum number of particles and
25	! skip_particles_for_tail,
26	! output of messages replaced by message handling routine
27	! Bugfix: arrays for tails are allocated with a minimum size of 10 tails if
28	! there is no tail initially
29	!
30	! 150 2008-02-29 08:19:58Z raasch
31	! Setting offset_ocean_* needed for calculating vertical indices within ocean
32	! runs
33	!
34	! 117 2007-10-11 03:27:59Z raasch
35	! Sorting of particles only in case of cloud droplets
36	!
37	! 106 2007-08-16 14:30:26Z raasch
38	! variable iran replaced by iran_part
39	!
40	! 82 2007-04-16 15:40:52Z raasch
41	! Preprocessor directives for old systems removed
42	!
43	! 70 2007-03-18 23:46:30Z raasch
44	! displacements for mpi_particle_type changed, age_m initialized,
45	! particles-package is now part of the default code
46	!
47	! 16 2007-02-15 13:16:47Z raasch
48	! Bugfix: MPI_REAL in MPI_ALLREDUCE replaced by MPI_INTEGER
49	!
50	! r4 \| raasch \| 2007-02-13 12:33:16 +0100 (Tue, 13 Feb 2007)
51	! RCS Log replace by Id keyword, revision history cleaned up
52	!
53	! Revision 1.24 2007/02/11 13:00:17 raasch
54	! Bugfix: allocation of tail_mask and new_tail_id in case of restart-runs
55	! Bugfix: __ was missing in a cpp-directive
56	!
57	! Revision 1.1 1999/11/25 16:22:38 raasch
58	! Initial revision
59	!
60	!
61	! Description:
62	! ------------
63	! This routine initializes a set of particles and their attributes (position,
64	! radius, ..). Advection of these particles is carried out by advec_particles,
65	! plotting is done in data_output_dvrp.
66	!------------------------------------------------------------------------------!
67
68	USE arrays_3d
69	USE cloud_parameters
70	USE control_parameters
71	USE dvrp_variables
72	USE grid_variables
73	USE indices
74	USE particle_attributes
75	USE pegrid
76	USE random_function_mod
77
78
79	IMPLICIT NONE
80
81	CHARACTER (LEN=10) :: particle_binary_version, version_on_file
82
83	INTEGER :: i, j, n, nn
84	#if defined( __parallel )
85	INTEGER, DIMENSION(3) :: blocklengths, displacements, types
86	#endif
87	LOGICAL :: uniform_particles_l
88	REAL :: factor, pos_x, pos_y, pos_z, value
89
90
91	#if defined( __parallel )
92	!
93	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
94	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
95	blocklengths(1) = 19; blocklengths(2) = 4; blocklengths(3) = 1
96	displacements(1) = 0; displacements(2) = 152; displacements(3) = 168
97
98	types(1) = MPI_REAL
99	types(2) = MPI_INTEGER
100	types(3) = MPI_UB
101	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
102	mpi_particle_type, ierr )
103	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
104	#endif
105
106	!
107	!-- In case of oceans runs, the vertical index calculations need an offset,
108	!-- because otherwise the k indices will become negative
109	IF ( ocean ) THEN
110	offset_ocean_nzt = nzt
111	offset_ocean_nzt_m1 = nzt - 1
112	ENDIF
113
114
115	!
116	!-- Check the number of particle groups.
117	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
118	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
119	max_number_of_particle_groups , &
120	'&number_of_particle_groups reset to ', &
121	max_number_of_particle_groups
122	CALL message( 'init_particles', 'PA0213', 0, 1, 0, 6, 0 )
123	number_of_particle_groups = max_number_of_particle_groups
124	ENDIF
125
126	!
127	!-- Set default start positions, if necessary
128	IF ( psl(1) == 9999999.9 ) psl(1) = -0.5 * dx
129	IF ( psr(1) == 9999999.9 ) psr(1) = ( nx + 0.5 ) * dx
130	IF ( pss(1) == 9999999.9 ) pss(1) = -0.5 * dy
131	IF ( psn(1) == 9999999.9 ) psn(1) = ( ny + 0.5 ) * dy
132	IF ( psb(1) == 9999999.9 ) psb(1) = zu(nz/2)
133	IF ( pst(1) == 9999999.9 ) pst(1) = psb(1)
134
135	IF ( pdx(1) == 9999999.9 .OR. pdx(1) == 0.0 ) pdx(1) = dx
136	IF ( pdy(1) == 9999999.9 .OR. pdy(1) == 0.0 ) pdy(1) = dy
137	IF ( pdz(1) == 9999999.9 .OR. pdz(1) == 0.0 ) pdz(1) = zu(2) - zu(1)
138
139	DO j = 2, number_of_particle_groups
140	IF ( psl(j) == 9999999.9 ) psl(j) = psl(j-1)
141	IF ( psr(j) == 9999999.9 ) psr(j) = psr(j-1)
142	IF ( pss(j) == 9999999.9 ) pss(j) = pss(j-1)
143	IF ( psn(j) == 9999999.9 ) psn(j) = psn(j-1)
144	IF ( psb(j) == 9999999.9 ) psb(j) = psb(j-1)
145	IF ( pst(j) == 9999999.9 ) pst(j) = pst(j-1)
146	IF ( pdx(j) == 9999999.9 .OR. pdx(j) == 0.0 ) pdx(j) = pdx(j-1)
147	IF ( pdy(j) == 9999999.9 .OR. pdy(j) == 0.0 ) pdy(j) = pdy(j-1)
148	IF ( pdz(j) == 9999999.9 .OR. pdz(j) == 0.0 ) pdz(j) = pdz(j-1)
149	ENDDO
150
151	!
152	!-- For the first model run of a possible job chain initialize the
153	!-- particles, otherwise read the particle data from file.
154	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
155	.AND. read_particles_from_restartfile ) THEN
156
157	!
158	!-- Read particle data from previous model run.
159	!-- First open the input unit.
160	IF ( myid_char == '' ) THEN
161	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN'//myid_char, &
162	FORM='UNFORMATTED' )
163	ELSE
164	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN/'//myid_char, &
165	FORM='UNFORMATTED' )
166	ENDIF
167
168	!
169	!-- First compare the version numbers
170	READ ( 90 ) version_on_file
171	particle_binary_version = '3.0'
172	IF ( TRIM( version_on_file ) /= TRIM( particle_binary_version ) ) THEN
173	message_string = 'version mismatch concerning data from prior ' // &
174	'run &version on file = "' // &
175	TRIM( version_on_file ) // &
176	'&version in program = "' // &
177	TRIM( particle_binary_version ) // '"'
178	CALL message( 'init_particles', 'PA0214', 1, 2, 0, 6, 0 )
179	ENDIF
180
181	!
182	!-- Read some particle parameters and the size of the particle arrays,
183	!-- allocate them and read their contents.
184	READ ( 90 ) bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
185	maximum_number_of_particles, maximum_number_of_tailpoints, &
186	maximum_number_of_tails, number_of_initial_particles, &
187	number_of_particles, number_of_particle_groups, &
188	number_of_tails, particle_groups, time_prel, &
189	time_write_particle_data, uniform_particles
190
191	IF ( number_of_initial_particles /= 0 ) THEN
192	ALLOCATE( initial_particles(1:number_of_initial_particles) )
193	READ ( 90 ) initial_particles
194	ENDIF
195
196	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
197	prt_start_index(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
198	particle_mask(maximum_number_of_particles), &
199	part_1(maximum_number_of_particles), &
200	part_2(maximum_number_of_particles) )
201
202	part_1 = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
203	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
204	0.0, 0, 0, 0, 0 )
205
206	part_2 = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
207	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
208	0.0, 0, 0, 0, 0 )
209
210	sort_count = 0
211
212	particles => part_1
213
214	READ ( 90 ) prt_count, prt_start_index
215	READ ( 90 ) particles
216
217	IF ( use_particle_tails ) THEN
218	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
219	maximum_number_of_tails), &
220	new_tail_id(maximum_number_of_tails), &
221	tail_mask(maximum_number_of_tails) )
222	READ ( 90 ) particle_tail_coordinates
223	ENDIF
224
225	CLOSE ( 90 )
226
227	ELSE
228
229	!
230	!-- Allocate particle arrays and set attributes of the initial set of
231	!-- particles, which can be also periodically released at later times.
232	!-- Also allocate array for particle tail coordinates, if needed.
233	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
234	prt_start_index(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
235	particle_mask(maximum_number_of_particles), &
236	part_1(maximum_number_of_particles), &
237	part_2(maximum_number_of_particles) )
238
239	particles => part_1
240
241	sort_count = 0
242
243	!
244	!-- Initialize all particles with dummy values (otherwise errors may
245	!-- occur within restart runs). The reason for this is still not clear
246	!-- and may be presumably caused by errors in the respective user-interface.
247	particles = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
248	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
249	0.0, 0, 0, 0, 0 )
250	particle_groups = particle_groups_type( 0.0, 0.0, 0.0, 0.0 )
251
252	!
253	!-- Set the default particle size used for dvrp plots
254	IF ( dvrp_psize == 9999999.9 ) dvrp_psize = 0.2 * dx
255
256	!
257	!-- Set values for the density ratio and radius for all particle
258	!-- groups, if necessary
259	IF ( density_ratio(1) == 9999999.9 ) density_ratio(1) = 0.0
260	IF ( radius(1) == 9999999.9 ) radius(1) = 0.0
261	DO i = 2, number_of_particle_groups
262	IF ( density_ratio(i) == 9999999.9 ) THEN
263	density_ratio(i) = density_ratio(i-1)
264	ENDIF
265	IF ( radius(i) == 9999999.9 ) radius(i) = radius(i-1)
266	ENDDO
267
268	DO i = 1, number_of_particle_groups
269	IF ( density_ratio(i) /= 0.0 .AND. radius(i) == 0 ) THEN
270	WRITE( message_string, * ) 'particle group #', i, 'has a', &
271	'density ratio /= 0 but radius = 0'
272	CALL message( 'init_particles', 'PA0215', 1, 2, 0, 6, 0 )
273	ENDIF
274	particle_groups(i)%density_ratio = density_ratio(i)
275	particle_groups(i)%radius = radius(i)
276	ENDDO
277
278	!
279	!-- Calculate particle positions and store particle attributes, if
280	!-- particle is situated on this PE
281	n = 0
282
283	DO i = 1, number_of_particle_groups
284
285	pos_z = psb(i)
286
287	DO WHILE ( pos_z <= pst(i) )
288
289	pos_y = pss(i)
290
291	DO WHILE ( pos_y <= psn(i) )
292
293	IF ( pos_y >= ( nys - 0.5 ) * dy .AND. &
294	pos_y < ( nyn + 0.5 ) * dy ) THEN
295
296	pos_x = psl(i)
297
298	DO WHILE ( pos_x <= psr(i) )
299
300	IF ( pos_x >= ( nxl - 0.5 ) * dx .AND. &
301	pos_x < ( nxr + 0.5 ) * dx ) THEN
302
303	DO j = 1, particles_per_point
304
305	n = n + 1
306	IF ( n > maximum_number_of_particles ) THEN
307	WRITE( message_string, * ) 'number of initial', &
308	'particles (', n, ') exceeds', &
309	'&maximum_number_of_particles (', &
310	maximum_number_of_particles, ') on PE ', &
311	myid
312	CALL message( 'init_particles', 'PA0216', &
313	2, 2, -1, 6, 1 )
314	ENDIF
315	particles(n)%x = pos_x
316	particles(n)%y = pos_y
317	particles(n)%z = pos_z
318	particles(n)%age = 0.0
319	particles(n)%age_m = 0.0
320	particles(n)%dt_sum = 0.0
321	particles(n)%dvrp_psize = dvrp_psize
322	particles(n)%e_m = 0.0
323	IF ( curvature_solution_effects ) THEN
324	!
325	!-- Initial values (internal timesteps, derivative)
326	!-- for Rosenbrock method
327	particles(n)%rvar1 = 1.0E-12
328	particles(n)%rvar2 = 1.0E-3
329	particles(n)%rvar3 = -9999999.9
330	ELSE
331	!
332	!-- Initial values for SGS velocities
333	particles(n)%rvar1 = 0.0
334	particles(n)%rvar2 = 0.0
335	particles(n)%rvar3 = 0.0
336	ENDIF
337	particles(n)%speed_x = 0.0
338	particles(n)%speed_y = 0.0
339	particles(n)%speed_z = 0.0
340	particles(n)%origin_x = pos_x
341	particles(n)%origin_y = pos_y
342	particles(n)%origin_z = pos_z
343	particles(n)%radius = particle_groups(i)%radius
344	particles(n)%weight_factor =initial_weighting_factor
345	particles(n)%color = 1
346	particles(n)%group = i
347	particles(n)%tailpoints = 0
348	IF ( use_particle_tails .AND. &
349	MOD( n, skip_particles_for_tail ) == 0 ) THEN
350	number_of_tails = number_of_tails + 1
351	!
352	!-- This is a temporary provisional setting (see
353	!-- further below!)
354	particles(n)%tail_id = number_of_tails
355	ELSE
356	particles(n)%tail_id = 0
357	ENDIF
358
359	ENDDO
360
361	ENDIF
362
363	pos_x = pos_x + pdx(i)
364
365	ENDDO
366
367	ENDIF
368
369	pos_y = pos_y + pdy(i)
370
371	ENDDO
372
373	pos_z = pos_z + pdz(i)
374
375	ENDDO
376
377	ENDDO
378
379	number_of_initial_particles = n
380	number_of_particles = n
381
382	!
383	!-- Calculate the number of particles and tails of the total domain
384	#if defined( __parallel )
385	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
386	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
387	MPI_INTEGER, MPI_SUM, comm2d, ierr )
388	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
389	CALL MPI_ALLREDUCE( number_of_tails, total_number_of_tails, 1, &
390	MPI_INTEGER, MPI_SUM, comm2d, ierr )
391	#else
392	total_number_of_particles = number_of_particles
393	total_number_of_tails = number_of_tails
394	#endif
395
396	!
397	!-- Set a seed value for the random number generator to be exclusively
398	!-- used for the particle code. The generated random numbers should be
399	!-- different on the different PEs.
400	iran_part = iran_part + myid
401
402	!
403	!-- User modification of initial particles
404	CALL user_init_particles
405
406	!
407	!-- Store the initial set of particles for release at later times
408	IF ( number_of_initial_particles /= 0 ) THEN
409	ALLOCATE( initial_particles(1:number_of_initial_particles) )
410	initial_particles(1:number_of_initial_particles) = &
411	particles(1:number_of_initial_particles)
412	ENDIF
413
414	!
415	!-- Add random fluctuation to particle positions
416	IF ( random_start_position ) THEN
417
418	DO n = 1, number_of_initial_particles
419	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
420	particles(n)%x = particles(n)%x + &
421	( random_function( iran_part ) - 0.5 ) * &
422	pdx(particles(n)%group)
423	IF ( particles(n)%x <= ( nxl - 0.5 ) * dx ) THEN
424	particles(n)%x = ( nxl - 0.4999999999 ) * dx
425	ELSEIF ( particles(n)%x >= ( nxr + 0.5 ) * dx ) THEN
426	particles(n)%x = ( nxr + 0.4999999999 ) * dx
427	ENDIF
428	ENDIF
429	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
430	particles(n)%y = particles(n)%y + &
431	( random_function( iran_part ) - 0.5 ) * &
432	pdy(particles(n)%group)
433	IF ( particles(n)%y <= ( nys - 0.5 ) * dy ) THEN
434	particles(n)%y = ( nys - 0.4999999999 ) * dy
435	ELSEIF ( particles(n)%y >= ( nyn + 0.5 ) * dy ) THEN
436	particles(n)%y = ( nyn + 0.4999999999 ) * dy
437	ENDIF
438	ENDIF
439	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
440	particles(n)%z = particles(n)%z + &
441	( random_function( iran_part ) - 0.5 ) * &
442	pdz(particles(n)%group)
443	ENDIF
444	ENDDO
445	ENDIF
446
447	!
448	!-- Sort particles in the sequence the gridboxes are stored in the memory.
449	!-- Only required if cloud droplets are used.
450	IF ( cloud_droplets ) CALL sort_particles
451
452	!
453	!-- Open file for statistical informations about particle conditions
454	IF ( write_particle_statistics ) THEN
455	CALL check_open( 80 )
456	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
457	number_of_initial_particles, &
458	maximum_number_of_particles
459	CALL close_file( 80 )
460	ENDIF
461
462	!
463	!-- Check if particles are really uniform in color and radius (dvrp_size)
464	!-- (uniform_particles is preset TRUE)
465	IF ( uniform_particles ) THEN
466	IF ( number_of_initial_particles == 0 ) THEN
467	uniform_particles_l = .TRUE.
468	ELSE
469	n = number_of_initial_particles
470	IF ( MINVAL( particles(1:n)%dvrp_psize ) == &
471	MAXVAL( particles(1:n)%dvrp_psize ) .AND. &
472	MINVAL( particles(1:n)%color ) == &
473	MAXVAL( particles(1:n)%color ) ) THEN
474	uniform_particles_l = .TRUE.
475	ELSE
476	uniform_particles_l = .FALSE.
477	ENDIF
478	ENDIF
479
480	#if defined( __parallel )
481	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
482	CALL MPI_ALLREDUCE( uniform_particles_l, uniform_particles, 1, &
483	MPI_LOGICAL, MPI_LAND, comm2d, ierr )
484	#else
485	uniform_particles = uniform_particles_l
486	#endif
487
488	ENDIF
489
490	!
491	!-- Particles will probably become none-uniform, if their size and color
492	!-- will be determined by flow variables
493	IF ( particle_color /= 'none' .OR. particle_dvrpsize /= 'none' ) THEN
494	uniform_particles = .FALSE.
495	ENDIF
496
497	!
498	!-- Set the beginning of the particle tails and their age
499	IF ( use_particle_tails ) THEN
500	!
501	!-- Choose the maximum number of tails with respect to the maximum number
502	!-- of particles and skip_particles_for_tail
503	maximum_number_of_tails = maximum_number_of_particles / &
504	skip_particles_for_tail
505
506	!
507	!-- Create a minimum number of tails in case that there is no tail
508	!-- initially (otherwise, index errors will occur when adressing the
509	!-- arrays below)
510	IF ( maximum_number_of_tails == 0 ) maximum_number_of_tails = 10
511
512	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
513	maximum_number_of_tails), &
514	new_tail_id(maximum_number_of_tails), &
515	tail_mask(maximum_number_of_tails) )
516
517	particle_tail_coordinates = 0.0
518	minimum_tailpoint_distance = minimum_tailpoint_distance**2
519	number_of_initial_tails = number_of_tails
520
521	nn = 0
522	DO n = 1, number_of_particles
523	!
524	!-- Only for those particles marked above with a provisional tail_id
525	!-- tails will be created. Particles now get their final tail_id.
526	IF ( particles(n)%tail_id /= 0 ) THEN
527
528	nn = nn + 1
529	particles(n)%tail_id = nn
530
531	particle_tail_coordinates(1,1,nn) = particles(n)%x
532	particle_tail_coordinates(1,2,nn) = particles(n)%y
533	particle_tail_coordinates(1,3,nn) = particles(n)%z
534	particle_tail_coordinates(1,4,nn) = particles(n)%color
535	particles(n)%tailpoints = 1
536	IF ( minimum_tailpoint_distance /= 0.0 ) THEN
537	particle_tail_coordinates(2,1,nn) = particles(n)%x
538	particle_tail_coordinates(2,2,nn) = particles(n)%y
539	particle_tail_coordinates(2,3,nn) = particles(n)%z
540	particle_tail_coordinates(2,4,nn) = particles(n)%color
541	particle_tail_coordinates(1:2,5,nn) = 0.0
542	particles(n)%tailpoints = 2
543	ENDIF
544
545	ENDIF
546	ENDDO
547	ENDIF
548
549	!
550	!-- Plot initial positions of particles (only if particle advection is
551	!-- switched on from the beginning of the simulation (t=0))
552	IF ( particle_advection_start == 0.0 ) CALL data_output_dvrp
553
554	ENDIF
555
556	!
557	!-- Check boundary condition and set internal variables
558	SELECT CASE ( bc_par_b )
559
560	CASE ( 'absorb' )
561	ibc_par_b = 1
562
563	CASE ( 'reflect' )
564	ibc_par_b = 2
565
566	CASE DEFAULT
567	WRITE( message_string, * ) 'unknown boundary condition ', &
568	'bc_par_b = "', TRIM( bc_par_b ), '"'
569	CALL message( 'init_particles', 'PA0217', 1, 2, 0, 6, 0 )
570
571	END SELECT
572	SELECT CASE ( bc_par_t )
573
574	CASE ( 'absorb' )
575	ibc_par_t = 1
576
577	CASE ( 'reflect' )
578	ibc_par_t = 2
579
580	CASE DEFAULT
581	WRITE( message_string, * ) 'unknown boundary condition ', &
582	'bc_par_t = "', TRIM( bc_par_t ), '"'
583	CALL message( 'init_particles', 'PA0218', 1, 2, 0, 6, 0 )
584
585	END SELECT
586	SELECT CASE ( bc_par_lr )
587
588	CASE ( 'cyclic' )
589	ibc_par_lr = 0
590
591	CASE ( 'absorb' )
592	ibc_par_lr = 1
593
594	CASE ( 'reflect' )
595	ibc_par_lr = 2
596
597	CASE DEFAULT
598	WRITE( message_string, * ) 'unknown boundary condition ', &
599	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
600	CALL message( 'init_particles', 'PA0219', 1, 2, 0, 6, 0 )
601
602	END SELECT
603	SELECT CASE ( bc_par_ns )
604
605	CASE ( 'cyclic' )
606	ibc_par_ns = 0
607
608	CASE ( 'absorb' )
609	ibc_par_ns = 1
610
611	CASE ( 'reflect' )
612	ibc_par_ns = 2
613
614	CASE DEFAULT
615	WRITE( message_string, * ) 'unknown boundary condition ', &
616	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
617	CALL message( 'init_particles', 'PA0220', 1, 2, 0, 6, 0 )
618
619	END SELECT
620	!
621	!-- Formats
622	8000 FORMAT (I6,1X,F7.2,4X,I6,71X,I6)
623
624	END SUBROUTINE init_particles

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