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source: palm/trunk/SOURCE/init_particles.f90 @ 268

Last change on this file since 268 was 254, checked in by heinze, 16 years ago
Output of messages replaced by message handling routine.
Property svn:keywords set to `Id`
File size: 21.3 KB

Rev	Line
[1]	1	SUBROUTINE init_particles
	2
	3	!------------------------------------------------------------------------------!
[254]	4	! Current revisions:
[1]	5	! -----------------
[254]	6	! Output of messages replaced by message handling routine
[229]	7	! Bugfix: arrays for tails are allocated with a minimum size of 10 tails if
	8	! there is no tail initially
[1]	9	!
	10	! Former revisions:
	11	! -----------------
[3]	12	! $Id: init_particles.f90 254 2009-03-05 15:33:42Z letzel $
[39]	13	!
[198]	14	! 150 2008-02-29 08:19:58Z raasch
	15	! Setting offset_ocean_* needed for calculating vertical indices within ocean
	16	! runs
	17	!
[139]	18	! 117 2007-10-11 03:27:59Z raasch
	19	! Sorting of particles only in case of cloud droplets
	20	!
[110]	21	! 106 2007-08-16 14:30:26Z raasch
	22	! variable iran replaced by iran_part
	23	!
[83]	24	! 82 2007-04-16 15:40:52Z raasch
	25	! Preprocessor directives for old systems removed
	26	!
[77]	27	! 70 2007-03-18 23:46:30Z raasch
	28	! displacements for mpi_particle_type changed, age_m initialized,
	29	! particles-package is now part of the default code
	30	!
[39]	31	! 16 2007-02-15 13:16:47Z raasch
	32	! Bugfix: MPI_REAL in MPI_ALLREDUCE replaced by MPI_INTEGER
	33	!
	34	! r4 \| raasch \| 2007-02-13 12:33:16 +0100 (Tue, 13 Feb 2007)
[3]	35	! RCS Log replace by Id keyword, revision history cleaned up
	36	!
[1]	37	! Revision 1.24 2007/02/11 13:00:17 raasch
	38	! Bugfix: allocation of tail_mask and new_tail_id in case of restart-runs
	39	! Bugfix: __ was missing in a cpp-directive
	40	!
	41	! Revision 1.1 1999/11/25 16:22:38 raasch
	42	! Initial revision
	43	!
	44	!
	45	! Description:
	46	! ------------
	47	! This routine initializes a set of particles and their attributes (position,
	48	! radius, ..). Advection of these particles is carried out by advec_particles,
	49	! plotting is done in data_output_dvrp.
	50	!------------------------------------------------------------------------------!
	51
	52	USE arrays_3d
	53	USE control_parameters
	54	USE grid_variables
	55	USE indices
	56	USE particle_attributes
	57	USE pegrid
	58	USE random_function_mod
	59
	60
	61	IMPLICIT NONE
	62
	63	CHARACTER (LEN=10) :: particle_binary_version, version_on_file
	64
	65	INTEGER :: i, j, n, nn
	66	#if defined( __parallel )
	67	INTEGER, DIMENSION(3) :: blocklengths, displacements, types
	68	#endif
	69	LOGICAL :: uniform_particles_l
	70	REAL :: factor, pos_x, pos_y, pos_z, value
	71
	72
	73	#if defined( __parallel )
	74	!
	75	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
[82]	76	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
	77	blocklengths(1) = 19; blocklengths(2) = 4; blocklengths(3) = 1
	78	displacements(1) = 0; displacements(2) = 152; displacements(3) = 168
	79
[1]	80	types(1) = MPI_REAL
	81	types(2) = MPI_INTEGER
	82	types(3) = MPI_UB
	83	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
	84	mpi_particle_type, ierr )
	85	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
	86	#endif
	87
	88	!
[150]	89	!-- In case of oceans runs, the vertical index calculations need an offset,
	90	!-- because otherwise the k indices will become negative
	91	IF ( ocean ) THEN
	92	offset_ocean_nzt = nzt
	93	offset_ocean_nzt_m1 = nzt - 1
	94	ENDIF
	95
	96
	97	!
[1]	98	!-- Check the number of particle groups.
	99	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
[254]	100	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
	101	max_number_of_particle_groups , &
	102	'&number_of_particle_groups reset to ', &
	103	max_number_of_particle_groups
	104	CALL message( 'init_particles', 'PA0213', 0, 1, 0, 6, 0 )
[1]	105	number_of_particle_groups = max_number_of_particle_groups
	106	ENDIF
	107
	108	!
	109	!-- Set default start positions, if necessary
	110	IF ( psl(1) == 9999999.9 ) psl(1) = -0.5 * dx
	111	IF ( psr(1) == 9999999.9 ) psr(1) = ( nx + 0.5 ) * dx
	112	IF ( pss(1) == 9999999.9 ) pss(1) = -0.5 * dy
	113	IF ( psn(1) == 9999999.9 ) psn(1) = ( ny + 0.5 ) * dy
	114	IF ( psb(1) == 9999999.9 ) psb(1) = zu(nz/2)
	115	IF ( pst(1) == 9999999.9 ) pst(1) = psb(1)
	116
	117	IF ( pdx(1) == 9999999.9 .OR. pdx(1) == 0.0 ) pdx(1) = dx
	118	IF ( pdy(1) == 9999999.9 .OR. pdy(1) == 0.0 ) pdy(1) = dy
	119	IF ( pdz(1) == 9999999.9 .OR. pdz(1) == 0.0 ) pdz(1) = zu(2) - zu(1)
	120
	121	DO j = 2, number_of_particle_groups
	122	IF ( psl(j) == 9999999.9 ) psl(j) = psl(j-1)
	123	IF ( psr(j) == 9999999.9 ) psr(j) = psr(j-1)
	124	IF ( pss(j) == 9999999.9 ) pss(j) = pss(j-1)
	125	IF ( psn(j) == 9999999.9 ) psn(j) = psn(j-1)
	126	IF ( psb(j) == 9999999.9 ) psb(j) = psb(j-1)
	127	IF ( pst(j) == 9999999.9 ) pst(j) = pst(j-1)
	128	IF ( pdx(j) == 9999999.9 .OR. pdx(j) == 0.0 ) pdx(j) = pdx(j-1)
	129	IF ( pdy(j) == 9999999.9 .OR. pdy(j) == 0.0 ) pdy(j) = pdy(j-1)
	130	IF ( pdz(j) == 9999999.9 .OR. pdz(j) == 0.0 ) pdz(j) = pdz(j-1)
	131	ENDDO
	132
	133	!
	134	!-- For the first model run of a possible job chain initialize the
	135	!-- particles, otherwise read the particle data from file.
	136	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
	137	.AND. read_particles_from_restartfile ) THEN
	138
	139	!
	140	!-- Read particle data from previous model run.
	141	!-- First open the input unit.
	142	IF ( myid_char == '' ) THEN
	143	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN'//myid_char, &
	144	FORM='UNFORMATTED' )
	145	ELSE
	146	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN/'//myid_char, &
	147	FORM='UNFORMATTED' )
	148	ENDIF
	149
	150	!
	151	!-- First compare the version numbers
	152	READ ( 90 ) version_on_file
	153	particle_binary_version = '3.0'
	154	IF ( TRIM( version_on_file ) /= TRIM( particle_binary_version ) ) THEN
[254]	155	message_string = 'version mismatch concerning data from prior run' // &
	156	'&version on file = "' // TRIM( version_on_file ) // &
	157	'&version in program = "' // &
	158	TRIM( particle_binary_version ) // '"'
	159	CALL message( 'init_particles', 'PA0214', 1, 2, 0, 6, 0 )
[1]	160	ENDIF
	161
	162	!
	163	!-- Read some particle parameters and the size of the particle arrays,
	164	!-- allocate them and read their contents.
	165	READ ( 90 ) bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
	166	maximum_number_of_particles, maximum_number_of_tailpoints, &
	167	maximum_number_of_tails, number_of_initial_particles, &
	168	number_of_particles, number_of_particle_groups, &
	169	number_of_tails, particle_groups, time_prel, &
	170	time_write_particle_data, uniform_particles
	171
	172	IF ( number_of_initial_particles /= 0 ) THEN
	173	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	174	READ ( 90 ) initial_particles
	175	ENDIF
	176
	177	ALLOCATE( prt_count(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	178	prt_start_index(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	179	particle_mask(maximum_number_of_particles), &
	180	particles(maximum_number_of_particles) )
	181
	182	READ ( 90 ) prt_count, prt_start_index
	183	READ ( 90 ) particles
	184
	185	IF ( use_particle_tails ) THEN
	186	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
	187	maximum_number_of_tails), &
	188	new_tail_id(maximum_number_of_tails), &
	189	tail_mask(maximum_number_of_tails) )
	190	READ ( 90 ) particle_tail_coordinates
	191	ENDIF
	192
	193	CLOSE ( 90 )
	194
	195	ELSE
	196
	197	!
	198	!-- Allocate particle arrays and set attributes of the initial set of
	199	!-- particles, which can be also periodically released at later times.
	200	!-- Also allocate array for particle tail coordinates, if needed.
	201	ALLOCATE( prt_count(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	202	prt_start_index(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	203	particle_mask(maximum_number_of_particles), &
	204	particles(maximum_number_of_particles) )
	205
	206	!
	207	!-- Initialize all particles with dummy values (otherwise errors may
	208	!-- occur within restart runs). The reason for this is still not clear
	209	!-- and may be presumably caused by errors in the respective user-interface.
	210	particles = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
	211	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
[57]	212	0.0, 0, 0, 0, 0 )
[1]	213	particle_groups = particle_groups_type( 0.0, 0.0, 0.0, 0.0 )
	214
	215	!
	216	!-- Set the default particle size used for dvrp plots
	217	IF ( dvrp_psize == 9999999.9 ) dvrp_psize = 0.2 * dx
	218
	219	!
	220	!-- Set values for the density ratio and radius for all particle
	221	!-- groups, if necessary
	222	IF ( density_ratio(1) == 9999999.9 ) density_ratio(1) = 0.0
	223	IF ( radius(1) == 9999999.9 ) radius(1) = 0.0
	224	DO i = 2, number_of_particle_groups
	225	IF ( density_ratio(i) == 9999999.9 ) THEN
	226	density_ratio(i) = density_ratio(i-1)
	227	ENDIF
	228	IF ( radius(i) == 9999999.9 ) radius(i) = radius(i-1)
	229	ENDDO
	230
	231	DO i = 1, number_of_particle_groups
	232	IF ( density_ratio(i) /= 0.0 .AND. radius(i) == 0 ) THEN
[254]	233	WRITE( message_string, * ) 'particle group #', i, 'has a', &
	234	'density ratio /= 0 but radius = 0'
	235	CALL message( 'init_particles', 'PA0215', 1, 2, 0, 6, 0 )
[1]	236	ENDIF
	237	particle_groups(i)%density_ratio = density_ratio(i)
	238	particle_groups(i)%radius = radius(i)
	239	ENDDO
	240
	241	!
	242	!-- Calculate particle positions and store particle attributes, if
	243	!-- particle is situated on this PE
	244	n = 0
	245
	246	DO i = 1, number_of_particle_groups
	247
	248	pos_z = psb(i)
	249
	250	DO WHILE ( pos_z <= pst(i) )
	251
	252	pos_y = pss(i)
	253
	254	DO WHILE ( pos_y <= psn(i) )
	255
	256	IF ( pos_y >= ( nys - 0.5 ) * dy .AND. &
	257	pos_y < ( nyn + 0.5 ) * dy ) THEN
	258
	259	pos_x = psl(i)
	260
	261	DO WHILE ( pos_x <= psr(i) )
	262
	263	IF ( pos_x >= ( nxl - 0.5 ) * dx .AND. &
	264	pos_x < ( nxr + 0.5 ) * dx ) THEN
	265
	266	DO j = 1, particles_per_point
	267
	268	n = n + 1
	269	IF ( n > maximum_number_of_particles ) THEN
[254]	270	WRITE( message_string, * ) 'number of initial', &
	271	'particles (', n, ') exceeds', &
	272	'&maximum_number_of_particles (', &
	273	maximum_number_of_particles, ') on PE ', &
	274	myid
	275	CALL message( 'init_particles', 'PA0216', 2, 2, 0, 6, 0 )
[1]	276	ENDIF
	277	particles(n)%x = pos_x
	278	particles(n)%y = pos_y
	279	particles(n)%z = pos_z
	280	particles(n)%age = 0.0
[57]	281	particles(n)%age_m = 0.0
[1]	282	particles(n)%dt_sum = 0.0
	283	particles(n)%dvrp_psize = dvrp_psize
	284	particles(n)%e_m = 0.0
	285	particles(n)%speed_x = 0.0
	286	particles(n)%speed_x_sgs = 0.0
	287	particles(n)%speed_y = 0.0
	288	particles(n)%speed_y_sgs = 0.0
	289	particles(n)%speed_z = 0.0
	290	particles(n)%speed_z_sgs = 0.0
	291	particles(n)%origin_x = pos_x
	292	particles(n)%origin_y = pos_y
	293	particles(n)%origin_z = pos_z
	294	particles(n)%radius = particle_groups(i)%radius
	295	particles(n)%weight_factor =initial_weighting_factor
	296	particles(n)%color = 1
	297	particles(n)%group = i
	298	particles(n)%tailpoints = 0
	299	IF ( use_particle_tails .AND. &
	300	MOD( n, skip_particles_for_tail ) == 0 ) THEN
	301	number_of_tails = number_of_tails + 1
	302	!
	303	!-- This is a temporary provisional setting (see
	304	!-- further below!)
	305	particles(n)%tail_id = number_of_tails
	306	ELSE
	307	particles(n)%tail_id = 0
	308	ENDIF
	309
	310	ENDDO
	311
	312	ENDIF
	313
	314	pos_x = pos_x + pdx(i)
	315
	316	ENDDO
	317
	318	ENDIF
	319
	320	pos_y = pos_y + pdy(i)
	321
	322	ENDDO
	323
	324	pos_z = pos_z + pdz(i)
	325
	326	ENDDO
	327
	328	ENDDO
	329
	330	number_of_initial_particles = n
	331	number_of_particles = n
	332
	333	!
	334	!-- Calculate the number of particles and tails of the total domain
	335	#if defined( __parallel )
	336	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
[16]	337	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	338	CALL MPI_ALLREDUCE( number_of_tails, total_number_of_tails, 1, &
[16]	339	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	340	#else
	341	total_number_of_particles = number_of_particles
	342	total_number_of_tails = number_of_tails
	343	#endif
	344
	345	!
	346	!-- Set a seed value for the random number generator to be exclusively
	347	!-- used for the particle code. The generated random numbers should be
	348	!-- different on the different PEs.
	349	iran_part = iran_part + myid
	350
	351	!
	352	!-- User modification of initial particles
	353	CALL user_init_particles
	354
	355	!
	356	!-- Store the initial set of particles for release at later times
	357	IF ( number_of_initial_particles /= 0 ) THEN
	358	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	359	initial_particles(1:number_of_initial_particles) = &
	360	particles(1:number_of_initial_particles)
	361	ENDIF
	362
	363	!
	364	!-- Add random fluctuation to particle positions
	365	IF ( random_start_position ) THEN
	366
	367	DO n = 1, number_of_initial_particles
	368	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
	369	particles(n)%x = particles(n)%x + &
[106]	370	( random_function( iran_part ) - 0.5 ) * &
[1]	371	pdx(particles(n)%group)
	372	IF ( particles(n)%x <= ( nxl - 0.5 ) * dx ) THEN
	373	particles(n)%x = ( nxl - 0.4999999999 ) * dx
	374	ELSEIF ( particles(n)%x >= ( nxr + 0.5 ) * dx ) THEN
	375	particles(n)%x = ( nxr + 0.4999999999 ) * dx
	376	ENDIF
	377	ENDIF
	378	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
	379	particles(n)%y = particles(n)%y + &
[106]	380	( random_function( iran_part ) - 0.5 ) * &
[1]	381	pdy(particles(n)%group)
	382	IF ( particles(n)%y <= ( nys - 0.5 ) * dy ) THEN
	383	particles(n)%y = ( nys - 0.4999999999 ) * dy
	384	ELSEIF ( particles(n)%y >= ( nyn + 0.5 ) * dy ) THEN
	385	particles(n)%y = ( nyn + 0.4999999999 ) * dy
	386	ENDIF
	387	ENDIF
	388	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
	389	particles(n)%z = particles(n)%z + &
[106]	390	( random_function( iran_part ) - 0.5 ) * &
[1]	391	pdz(particles(n)%group)
	392	ENDIF
	393	ENDDO
	394	ENDIF
	395
	396	!
[117]	397	!-- Sort particles in the sequence the gridboxes are stored in the memory.
	398	!-- Only required if cloud droplets are used.
	399	IF ( cloud_droplets ) CALL sort_particles
[1]	400
	401	!
	402	!-- Open file for statistical informations about particle conditions
	403	IF ( write_particle_statistics ) THEN
	404	CALL check_open( 80 )
	405	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
	406	number_of_initial_particles, &
	407	maximum_number_of_particles
	408	CALL close_file( 80 )
	409	ENDIF
	410
	411	!
	412	!-- Check if particles are really uniform in color and radius (dvrp_size)
	413	!-- (uniform_particles is preset TRUE)
	414	IF ( uniform_particles ) THEN
	415	IF ( number_of_initial_particles == 0 ) THEN
	416	uniform_particles_l = .TRUE.
	417	ELSE
	418	n = number_of_initial_particles
	419	IF ( MINVAL( particles(1:n)%dvrp_psize ) == &
	420	MAXVAL( particles(1:n)%dvrp_psize ) .AND. &
	421	MINVAL( particles(1:n)%color ) == &
	422	MAXVAL( particles(1:n)%color ) ) THEN
	423	uniform_particles_l = .TRUE.
	424	ELSE
	425	uniform_particles_l = .FALSE.
	426	ENDIF
	427	ENDIF
	428
	429	#if defined( __parallel )
	430	CALL MPI_ALLREDUCE( uniform_particles_l, uniform_particles, 1, &
	431	MPI_LOGICAL, MPI_LAND, comm2d, ierr )
	432	#else
	433	uniform_particles = uniform_particles_l
	434	#endif
	435
	436	ENDIF
	437
	438	!
	439	!-- Set the beginning of the particle tails and their age
	440	IF ( use_particle_tails ) THEN
	441	!
	442	!-- Choose the maximum number of tails significantly larger than the
	443	!-- one initially required
	444	factor = 10.0
	445	value = number_of_tails
	446	DO WHILE ( value / 10.0 >= 1.0 )
	447	factor = factor * 10.0
	448	value = value / 10.0
	449	ENDDO
	450	maximum_number_of_tails = factor * INT( value )
[229]	451	!
	452	!-- Create a minimum number of tails in case that there is no tail
	453	!-- initially (otherwise, index errors will occur when adressing the
	454	!-- arrays below)
	455	IF ( maximum_number_of_tails == 0 ) maximum_number_of_tails = 10
[1]	456
	457	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
	458	maximum_number_of_tails), &
	459	new_tail_id(maximum_number_of_tails), &
	460	tail_mask(maximum_number_of_tails) )
	461
	462	particle_tail_coordinates = 0.0
	463	minimum_tailpoint_distance = minimum_tailpoint_distance**2
	464	number_of_initial_tails = number_of_tails
	465
	466	nn = 0
	467	DO n = 1, number_of_particles
	468	!
	469	!-- Only for those particles marked above with a provisional tail_id
	470	!-- tails will be created. Particles now get their final tail_id.
	471	IF ( particles(n)%tail_id /= 0 ) THEN
	472
	473	nn = nn + 1
	474	particles(n)%tail_id = nn
	475
	476	particle_tail_coordinates(1,1,nn) = particles(n)%x
	477	particle_tail_coordinates(1,2,nn) = particles(n)%y
	478	particle_tail_coordinates(1,3,nn) = particles(n)%z
	479	particle_tail_coordinates(1,4,nn) = particles(n)%color
	480	particles(n)%tailpoints = 1
	481	IF ( minimum_tailpoint_distance /= 0.0 ) THEN
	482	particle_tail_coordinates(2,1,nn) = particles(n)%x
	483	particle_tail_coordinates(2,2,nn) = particles(n)%y
	484	particle_tail_coordinates(2,3,nn) = particles(n)%z
	485	particle_tail_coordinates(2,4,nn) = particles(n)%color
	486	particle_tail_coordinates(1:2,5,nn) = 0.0
	487	particles(n)%tailpoints = 2
	488	ENDIF
	489
	490	ENDIF
	491	ENDDO
	492	ENDIF
	493
	494	!
	495	!-- Plot initial positions of particles (only if particle advection is
	496	!-- switched on from the beginning of the simulation (t=0))
	497	IF ( particle_advection_start == 0.0 ) CALL data_output_dvrp
	498
	499	ENDIF
	500
	501	!
	502	!-- Check boundary condition and set internal variables
	503	SELECT CASE ( bc_par_b )
	504
	505	CASE ( 'absorb' )
	506	ibc_par_b = 1
	507
	508	CASE ( 'reflect' )
	509	ibc_par_b = 2
	510
	511	CASE DEFAULT
[254]	512	WRITE( message_string, * ) 'unknown boundary condition ', &
	513	'bc_par_b = "', TRIM( bc_par_b ), '"'
	514	CALL message( 'init_particles', 'PA0217', 1, 2, 0, 6, 0 )
[1]	515
	516	END SELECT
	517	SELECT CASE ( bc_par_t )
	518
	519	CASE ( 'absorb' )
	520	ibc_par_t = 1
	521
	522	CASE ( 'reflect' )
	523	ibc_par_t = 2
	524
	525	CASE DEFAULT
[254]	526	WRITE( message_string, * ) 'unknown boundary condition ', &
	527	'bc_par_t = "', TRIM( bc_par_t ), '"'
	528	CALL message( 'init_particles', 'PA0218', 1, 2, 0, 6, 0 )
[1]	529
	530	END SELECT
	531	SELECT CASE ( bc_par_lr )
	532
	533	CASE ( 'cyclic' )
	534	ibc_par_lr = 0
	535
	536	CASE ( 'absorb' )
	537	ibc_par_lr = 1
	538
	539	CASE ( 'reflect' )
	540	ibc_par_lr = 2
	541
	542	CASE DEFAULT
[254]	543	WRITE( message_string, * ) 'unknown boundary condition ', &
	544	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
	545	CALL message( 'init_particles', 'PA0219', 1, 2, 0, 6, 0 )
[1]	546
	547	END SELECT
	548	SELECT CASE ( bc_par_ns )
	549
	550	CASE ( 'cyclic' )
	551	ibc_par_ns = 0
	552
	553	CASE ( 'absorb' )
	554	ibc_par_ns = 1
	555
	556	CASE ( 'reflect' )
	557	ibc_par_ns = 2
	558
	559	CASE DEFAULT
[254]	560	WRITE( message_string, * ) 'unknown boundary condition ', &
	561	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
	562	CALL message( 'init_particles', 'PA0220', 1, 2, 0, 6, 0 )
[1]	563
	564	END SELECT
	565	!
	566	!-- Formats
	567	8000 FORMAT (I6,1X,F7.2,4X,I6,71X,I6)
	568
	569	END SUBROUTINE init_particles

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