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source: palm/trunk/SOURCE/init_particles.f90 @ 375

Last change on this file since 375 was 336, checked in by raasch, 15 years ago
several small bugfixes; some more dvrp changes
Property svn:keywords set to `Id`
File size: 21.7 KB

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

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