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source: palm/trunk/SOURCE/init_particles.f90 @ 275

Last change on this file since 275 was 274, checked in by heinze, 16 years ago
Indentation of the message calls corrected
Property svn:keywords set to `Id`
File size: 21.5 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 274 2009-03-26 15:11:21Z raasch $
[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
[274]	100	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
	101	max_number_of_particle_groups , &
[254]	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
[274]	155	message_string = 'version mismatch concerning data from prior ' // &
	156	'run &version on file = "' // &
	157	TRIM( version_on_file ) // &
	158	'&version in program = "' // &
	159	TRIM( particle_binary_version ) // '"'
[254]	160	CALL message( 'init_particles', 'PA0214', 1, 2, 0, 6, 0 )
[1]	161	ENDIF
	162
	163	!
	164	!-- Read some particle parameters and the size of the particle arrays,
	165	!-- allocate them and read their contents.
	166	READ ( 90 ) bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
	167	maximum_number_of_particles, maximum_number_of_tailpoints, &
	168	maximum_number_of_tails, number_of_initial_particles, &
	169	number_of_particles, number_of_particle_groups, &
	170	number_of_tails, particle_groups, time_prel, &
	171	time_write_particle_data, uniform_particles
	172
	173	IF ( number_of_initial_particles /= 0 ) THEN
	174	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	175	READ ( 90 ) initial_particles
	176	ENDIF
	177
	178	ALLOCATE( prt_count(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	179	prt_start_index(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	180	particle_mask(maximum_number_of_particles), &
	181	particles(maximum_number_of_particles) )
	182
	183	READ ( 90 ) prt_count, prt_start_index
	184	READ ( 90 ) particles
	185
	186	IF ( use_particle_tails ) THEN
	187	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
	188	maximum_number_of_tails), &
	189	new_tail_id(maximum_number_of_tails), &
	190	tail_mask(maximum_number_of_tails) )
	191	READ ( 90 ) particle_tail_coordinates
	192	ENDIF
	193
	194	CLOSE ( 90 )
	195
	196	ELSE
	197
	198	!
	199	!-- Allocate particle arrays and set attributes of the initial set of
	200	!-- particles, which can be also periodically released at later times.
	201	!-- Also allocate array for particle tail coordinates, if needed.
	202	ALLOCATE( prt_count(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	203	prt_start_index(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	204	particle_mask(maximum_number_of_particles), &
	205	particles(maximum_number_of_particles) )
	206
	207	!
	208	!-- Initialize all particles with dummy values (otherwise errors may
	209	!-- occur within restart runs). The reason for this is still not clear
	210	!-- and may be presumably caused by errors in the respective user-interface.
	211	particles = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
	212	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
[57]	213	0.0, 0, 0, 0, 0 )
[1]	214	particle_groups = particle_groups_type( 0.0, 0.0, 0.0, 0.0 )
	215
	216	!
	217	!-- Set the default particle size used for dvrp plots
	218	IF ( dvrp_psize == 9999999.9 ) dvrp_psize = 0.2 * dx
	219
	220	!
	221	!-- Set values for the density ratio and radius for all particle
	222	!-- groups, if necessary
	223	IF ( density_ratio(1) == 9999999.9 ) density_ratio(1) = 0.0
	224	IF ( radius(1) == 9999999.9 ) radius(1) = 0.0
	225	DO i = 2, number_of_particle_groups
	226	IF ( density_ratio(i) == 9999999.9 ) THEN
	227	density_ratio(i) = density_ratio(i-1)
	228	ENDIF
	229	IF ( radius(i) == 9999999.9 ) radius(i) = radius(i-1)
	230	ENDDO
	231
	232	DO i = 1, number_of_particle_groups
	233	IF ( density_ratio(i) /= 0.0 .AND. radius(i) == 0 ) THEN
[254]	234	WRITE( message_string, * ) 'particle group #', i, 'has a', &
	235	'density ratio /= 0 but radius = 0'
	236	CALL message( 'init_particles', 'PA0215', 1, 2, 0, 6, 0 )
[1]	237	ENDIF
	238	particle_groups(i)%density_ratio = density_ratio(i)
	239	particle_groups(i)%radius = radius(i)
	240	ENDDO
	241
	242	!
	243	!-- Calculate particle positions and store particle attributes, if
	244	!-- particle is situated on this PE
	245	n = 0
	246
	247	DO i = 1, number_of_particle_groups
	248
	249	pos_z = psb(i)
	250
	251	DO WHILE ( pos_z <= pst(i) )
	252
	253	pos_y = pss(i)
	254
	255	DO WHILE ( pos_y <= psn(i) )
	256
	257	IF ( pos_y >= ( nys - 0.5 ) * dy .AND. &
	258	pos_y < ( nyn + 0.5 ) * dy ) THEN
	259
	260	pos_x = psl(i)
	261
	262	DO WHILE ( pos_x <= psr(i) )
	263
	264	IF ( pos_x >= ( nxl - 0.5 ) * dx .AND. &
	265	pos_x < ( nxr + 0.5 ) * dx ) THEN
	266
	267	DO j = 1, particles_per_point
	268
	269	n = n + 1
	270	IF ( n > maximum_number_of_particles ) THEN
[254]	271	WRITE( message_string, * ) 'number of initial', &
[274]	272	'particles (', n, ') exceeds', &
	273	'&maximum_number_of_particles (', &
	274	maximum_number_of_particles, ') on PE ', &
[254]	275	myid
[274]	276	CALL message( 'init_particles', 'PA0216', &
	277	2, 2, 0, 6, 0 )
[1]	278	ENDIF
	279	particles(n)%x = pos_x
	280	particles(n)%y = pos_y
	281	particles(n)%z = pos_z
	282	particles(n)%age = 0.0
[57]	283	particles(n)%age_m = 0.0
[1]	284	particles(n)%dt_sum = 0.0
	285	particles(n)%dvrp_psize = dvrp_psize
	286	particles(n)%e_m = 0.0
	287	particles(n)%speed_x = 0.0
	288	particles(n)%speed_x_sgs = 0.0
	289	particles(n)%speed_y = 0.0
	290	particles(n)%speed_y_sgs = 0.0
	291	particles(n)%speed_z = 0.0
	292	particles(n)%speed_z_sgs = 0.0
	293	particles(n)%origin_x = pos_x
	294	particles(n)%origin_y = pos_y
	295	particles(n)%origin_z = pos_z
	296	particles(n)%radius = particle_groups(i)%radius
	297	particles(n)%weight_factor =initial_weighting_factor
	298	particles(n)%color = 1
	299	particles(n)%group = i
	300	particles(n)%tailpoints = 0
	301	IF ( use_particle_tails .AND. &
	302	MOD( n, skip_particles_for_tail ) == 0 ) THEN
	303	number_of_tails = number_of_tails + 1
	304	!
	305	!-- This is a temporary provisional setting (see
	306	!-- further below!)
	307	particles(n)%tail_id = number_of_tails
	308	ELSE
	309	particles(n)%tail_id = 0
	310	ENDIF
	311
	312	ENDDO
	313
	314	ENDIF
	315
	316	pos_x = pos_x + pdx(i)
	317
	318	ENDDO
	319
	320	ENDIF
	321
	322	pos_y = pos_y + pdy(i)
	323
	324	ENDDO
	325
	326	pos_z = pos_z + pdz(i)
	327
	328	ENDDO
	329
	330	ENDDO
	331
	332	number_of_initial_particles = n
	333	number_of_particles = n
	334
	335	!
	336	!-- Calculate the number of particles and tails of the total domain
	337	#if defined( __parallel )
	338	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
[16]	339	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	340	CALL MPI_ALLREDUCE( number_of_tails, total_number_of_tails, 1, &
[16]	341	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	342	#else
	343	total_number_of_particles = number_of_particles
	344	total_number_of_tails = number_of_tails
	345	#endif
	346
	347	!
	348	!-- Set a seed value for the random number generator to be exclusively
	349	!-- used for the particle code. The generated random numbers should be
	350	!-- different on the different PEs.
	351	iran_part = iran_part + myid
	352
	353	!
	354	!-- User modification of initial particles
	355	CALL user_init_particles
	356
	357	!
	358	!-- Store the initial set of particles for release at later times
	359	IF ( number_of_initial_particles /= 0 ) THEN
	360	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	361	initial_particles(1:number_of_initial_particles) = &
	362	particles(1:number_of_initial_particles)
	363	ENDIF
	364
	365	!
	366	!-- Add random fluctuation to particle positions
	367	IF ( random_start_position ) THEN
	368
	369	DO n = 1, number_of_initial_particles
	370	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
	371	particles(n)%x = particles(n)%x + &
[106]	372	( random_function( iran_part ) - 0.5 ) * &
[1]	373	pdx(particles(n)%group)
	374	IF ( particles(n)%x <= ( nxl - 0.5 ) * dx ) THEN
	375	particles(n)%x = ( nxl - 0.4999999999 ) * dx
	376	ELSEIF ( particles(n)%x >= ( nxr + 0.5 ) * dx ) THEN
	377	particles(n)%x = ( nxr + 0.4999999999 ) * dx
	378	ENDIF
	379	ENDIF
	380	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
	381	particles(n)%y = particles(n)%y + &
[106]	382	( random_function( iran_part ) - 0.5 ) * &
[1]	383	pdy(particles(n)%group)
	384	IF ( particles(n)%y <= ( nys - 0.5 ) * dy ) THEN
	385	particles(n)%y = ( nys - 0.4999999999 ) * dy
	386	ELSEIF ( particles(n)%y >= ( nyn + 0.5 ) * dy ) THEN
	387	particles(n)%y = ( nyn + 0.4999999999 ) * dy
	388	ENDIF
	389	ENDIF
	390	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
	391	particles(n)%z = particles(n)%z + &
[106]	392	( random_function( iran_part ) - 0.5 ) * &
[1]	393	pdz(particles(n)%group)
	394	ENDIF
	395	ENDDO
	396	ENDIF
	397
	398	!
[117]	399	!-- Sort particles in the sequence the gridboxes are stored in the memory.
	400	!-- Only required if cloud droplets are used.
	401	IF ( cloud_droplets ) CALL sort_particles
[1]	402
	403	!
	404	!-- Open file for statistical informations about particle conditions
	405	IF ( write_particle_statistics ) THEN
	406	CALL check_open( 80 )
	407	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
	408	number_of_initial_particles, &
	409	maximum_number_of_particles
	410	CALL close_file( 80 )
	411	ENDIF
	412
	413	!
	414	!-- Check if particles are really uniform in color and radius (dvrp_size)
	415	!-- (uniform_particles is preset TRUE)
	416	IF ( uniform_particles ) THEN
	417	IF ( number_of_initial_particles == 0 ) THEN
	418	uniform_particles_l = .TRUE.
	419	ELSE
	420	n = number_of_initial_particles
	421	IF ( MINVAL( particles(1:n)%dvrp_psize ) == &
	422	MAXVAL( particles(1:n)%dvrp_psize ) .AND. &
	423	MINVAL( particles(1:n)%color ) == &
	424	MAXVAL( particles(1:n)%color ) ) THEN
	425	uniform_particles_l = .TRUE.
	426	ELSE
	427	uniform_particles_l = .FALSE.
	428	ENDIF
	429	ENDIF
	430
	431	#if defined( __parallel )
	432	CALL MPI_ALLREDUCE( uniform_particles_l, uniform_particles, 1, &
	433	MPI_LOGICAL, MPI_LAND, comm2d, ierr )
	434	#else
	435	uniform_particles = uniform_particles_l
	436	#endif
	437
	438	ENDIF
	439
	440	!
	441	!-- Set the beginning of the particle tails and their age
	442	IF ( use_particle_tails ) THEN
	443	!
	444	!-- Choose the maximum number of tails significantly larger than the
	445	!-- one initially required
	446	factor = 10.0
	447	value = number_of_tails
	448	DO WHILE ( value / 10.0 >= 1.0 )
	449	factor = factor * 10.0
	450	value = value / 10.0
	451	ENDDO
	452	maximum_number_of_tails = factor * INT( value )
[229]	453	!
	454	!-- Create a minimum number of tails in case that there is no tail
	455	!-- initially (otherwise, index errors will occur when adressing the
	456	!-- arrays below)
	457	IF ( maximum_number_of_tails == 0 ) maximum_number_of_tails = 10
[1]	458
	459	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
	460	maximum_number_of_tails), &
	461	new_tail_id(maximum_number_of_tails), &
	462	tail_mask(maximum_number_of_tails) )
	463
	464	particle_tail_coordinates = 0.0
	465	minimum_tailpoint_distance = minimum_tailpoint_distance**2
	466	number_of_initial_tails = number_of_tails
	467
	468	nn = 0
	469	DO n = 1, number_of_particles
	470	!
	471	!-- Only for those particles marked above with a provisional tail_id
	472	!-- tails will be created. Particles now get their final tail_id.
	473	IF ( particles(n)%tail_id /= 0 ) THEN
	474
	475	nn = nn + 1
	476	particles(n)%tail_id = nn
	477
	478	particle_tail_coordinates(1,1,nn) = particles(n)%x
	479	particle_tail_coordinates(1,2,nn) = particles(n)%y
	480	particle_tail_coordinates(1,3,nn) = particles(n)%z
	481	particle_tail_coordinates(1,4,nn) = particles(n)%color
	482	particles(n)%tailpoints = 1
	483	IF ( minimum_tailpoint_distance /= 0.0 ) THEN
	484	particle_tail_coordinates(2,1,nn) = particles(n)%x
	485	particle_tail_coordinates(2,2,nn) = particles(n)%y
	486	particle_tail_coordinates(2,3,nn) = particles(n)%z
	487	particle_tail_coordinates(2,4,nn) = particles(n)%color
	488	particle_tail_coordinates(1:2,5,nn) = 0.0
	489	particles(n)%tailpoints = 2
	490	ENDIF
	491
	492	ENDIF
	493	ENDDO
	494	ENDIF
	495
	496	!
	497	!-- Plot initial positions of particles (only if particle advection is
	498	!-- switched on from the beginning of the simulation (t=0))
	499	IF ( particle_advection_start == 0.0 ) CALL data_output_dvrp
	500
	501	ENDIF
	502
	503	!
	504	!-- Check boundary condition and set internal variables
	505	SELECT CASE ( bc_par_b )
	506
	507	CASE ( 'absorb' )
	508	ibc_par_b = 1
	509
	510	CASE ( 'reflect' )
	511	ibc_par_b = 2
	512
	513	CASE DEFAULT
[254]	514	WRITE( message_string, * ) 'unknown boundary condition ', &
	515	'bc_par_b = "', TRIM( bc_par_b ), '"'
	516	CALL message( 'init_particles', 'PA0217', 1, 2, 0, 6, 0 )
[1]	517
	518	END SELECT
	519	SELECT CASE ( bc_par_t )
	520
	521	CASE ( 'absorb' )
	522	ibc_par_t = 1
	523
	524	CASE ( 'reflect' )
	525	ibc_par_t = 2
	526
	527	CASE DEFAULT
[254]	528	WRITE( message_string, * ) 'unknown boundary condition ', &
	529	'bc_par_t = "', TRIM( bc_par_t ), '"'
	530	CALL message( 'init_particles', 'PA0218', 1, 2, 0, 6, 0 )
[1]	531
	532	END SELECT
	533	SELECT CASE ( bc_par_lr )
	534
	535	CASE ( 'cyclic' )
	536	ibc_par_lr = 0
	537
	538	CASE ( 'absorb' )
	539	ibc_par_lr = 1
	540
	541	CASE ( 'reflect' )
	542	ibc_par_lr = 2
	543
	544	CASE DEFAULT
[254]	545	WRITE( message_string, * ) 'unknown boundary condition ', &
	546	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
	547	CALL message( 'init_particles', 'PA0219', 1, 2, 0, 6, 0 )
[1]	548
	549	END SELECT
	550	SELECT CASE ( bc_par_ns )
	551
	552	CASE ( 'cyclic' )
	553	ibc_par_ns = 0
	554
	555	CASE ( 'absorb' )
	556	ibc_par_ns = 1
	557
	558	CASE ( 'reflect' )
	559	ibc_par_ns = 2
	560
	561	CASE DEFAULT
[254]	562	WRITE( message_string, * ) 'unknown boundary condition ', &
	563	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
	564	CALL message( 'init_particles', 'PA0220', 1, 2, 0, 6, 0 )
[1]	565
	566	END SELECT
	567	!
	568	!-- Formats
	569	8000 FORMAT (I6,1X,F7.2,4X,I6,71X,I6)
	570
	571	END SUBROUTINE init_particles

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