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source: palm/trunk/SOURCE/init_particles.f90 @ 326

Last change on this file since 326 was 277, checked in by heinze, 16 years ago
Change of arguments in message calls whenever there are errors induced by MPI-ABORT
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	! -----------------
[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 277 2009-03-31 09:13:47Z raasch $
[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
	56	USE grid_variables
	57	USE indices
	58	USE particle_attributes
	59	USE pegrid
	60	USE random_function_mod
	61
	62
	63	IMPLICIT NONE
	64
	65	CHARACTER (LEN=10) :: particle_binary_version, version_on_file
	66
	67	INTEGER :: i, j, n, nn
	68	#if defined( __parallel )
	69	INTEGER, DIMENSION(3) :: blocklengths, displacements, types
	70	#endif
	71	LOGICAL :: uniform_particles_l
	72	REAL :: factor, pos_x, pos_y, pos_z, value
	73
	74
	75	#if defined( __parallel )
	76	!
	77	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
[82]	78	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
	79	blocklengths(1) = 19; blocklengths(2) = 4; blocklengths(3) = 1
	80	displacements(1) = 0; displacements(2) = 152; displacements(3) = 168
	81
[1]	82	types(1) = MPI_REAL
	83	types(2) = MPI_INTEGER
	84	types(3) = MPI_UB
	85	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
	86	mpi_particle_type, ierr )
	87	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
	88	#endif
	89
	90	!
[150]	91	!-- In case of oceans runs, the vertical index calculations need an offset,
	92	!-- because otherwise the k indices will become negative
	93	IF ( ocean ) THEN
	94	offset_ocean_nzt = nzt
	95	offset_ocean_nzt_m1 = nzt - 1
	96	ENDIF
	97
	98
	99	!
[1]	100	!-- Check the number of particle groups.
	101	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
[274]	102	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
	103	max_number_of_particle_groups , &
[254]	104	'&number_of_particle_groups reset to ', &
	105	max_number_of_particle_groups
	106	CALL message( 'init_particles', 'PA0213', 0, 1, 0, 6, 0 )
[1]	107	number_of_particle_groups = max_number_of_particle_groups
	108	ENDIF
	109
	110	!
	111	!-- Set default start positions, if necessary
	112	IF ( psl(1) == 9999999.9 ) psl(1) = -0.5 * dx
	113	IF ( psr(1) == 9999999.9 ) psr(1) = ( nx + 0.5 ) * dx
	114	IF ( pss(1) == 9999999.9 ) pss(1) = -0.5 * dy
	115	IF ( psn(1) == 9999999.9 ) psn(1) = ( ny + 0.5 ) * dy
	116	IF ( psb(1) == 9999999.9 ) psb(1) = zu(nz/2)
	117	IF ( pst(1) == 9999999.9 ) pst(1) = psb(1)
	118
	119	IF ( pdx(1) == 9999999.9 .OR. pdx(1) == 0.0 ) pdx(1) = dx
	120	IF ( pdy(1) == 9999999.9 .OR. pdy(1) == 0.0 ) pdy(1) = dy
	121	IF ( pdz(1) == 9999999.9 .OR. pdz(1) == 0.0 ) pdz(1) = zu(2) - zu(1)
	122
	123	DO j = 2, number_of_particle_groups
	124	IF ( psl(j) == 9999999.9 ) psl(j) = psl(j-1)
	125	IF ( psr(j) == 9999999.9 ) psr(j) = psr(j-1)
	126	IF ( pss(j) == 9999999.9 ) pss(j) = pss(j-1)
	127	IF ( psn(j) == 9999999.9 ) psn(j) = psn(j-1)
	128	IF ( psb(j) == 9999999.9 ) psb(j) = psb(j-1)
	129	IF ( pst(j) == 9999999.9 ) pst(j) = pst(j-1)
	130	IF ( pdx(j) == 9999999.9 .OR. pdx(j) == 0.0 ) pdx(j) = pdx(j-1)
	131	IF ( pdy(j) == 9999999.9 .OR. pdy(j) == 0.0 ) pdy(j) = pdy(j-1)
	132	IF ( pdz(j) == 9999999.9 .OR. pdz(j) == 0.0 ) pdz(j) = pdz(j-1)
	133	ENDDO
	134
	135	!
	136	!-- For the first model run of a possible job chain initialize the
	137	!-- particles, otherwise read the particle data from file.
	138	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
	139	.AND. read_particles_from_restartfile ) THEN
	140
	141	!
	142	!-- Read particle data from previous model run.
	143	!-- First open the input unit.
	144	IF ( myid_char == '' ) THEN
	145	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN'//myid_char, &
	146	FORM='UNFORMATTED' )
	147	ELSE
	148	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN/'//myid_char, &
	149	FORM='UNFORMATTED' )
	150	ENDIF
	151
	152	!
	153	!-- First compare the version numbers
	154	READ ( 90 ) version_on_file
	155	particle_binary_version = '3.0'
	156	IF ( TRIM( version_on_file ) /= TRIM( particle_binary_version ) ) THEN
[274]	157	message_string = 'version mismatch concerning data from prior ' // &
	158	'run &version on file = "' // &
	159	TRIM( version_on_file ) // &
	160	'&version in program = "' // &
	161	TRIM( particle_binary_version ) // '"'
[254]	162	CALL message( 'init_particles', 'PA0214', 1, 2, 0, 6, 0 )
[1]	163	ENDIF
	164
	165	!
	166	!-- Read some particle parameters and the size of the particle arrays,
	167	!-- allocate them and read their contents.
	168	READ ( 90 ) bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
	169	maximum_number_of_particles, maximum_number_of_tailpoints, &
	170	maximum_number_of_tails, number_of_initial_particles, &
	171	number_of_particles, number_of_particle_groups, &
	172	number_of_tails, particle_groups, time_prel, &
	173	time_write_particle_data, uniform_particles
	174
	175	IF ( number_of_initial_particles /= 0 ) THEN
	176	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	177	READ ( 90 ) initial_particles
	178	ENDIF
	179
	180	ALLOCATE( prt_count(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	181	prt_start_index(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	182	particle_mask(maximum_number_of_particles), &
	183	particles(maximum_number_of_particles) )
	184
	185	READ ( 90 ) prt_count, prt_start_index
	186	READ ( 90 ) particles
	187
	188	IF ( use_particle_tails ) THEN
	189	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
	190	maximum_number_of_tails), &
	191	new_tail_id(maximum_number_of_tails), &
	192	tail_mask(maximum_number_of_tails) )
	193	READ ( 90 ) particle_tail_coordinates
	194	ENDIF
	195
	196	CLOSE ( 90 )
	197
	198	ELSE
	199
	200	!
	201	!-- Allocate particle arrays and set attributes of the initial set of
	202	!-- particles, which can be also periodically released at later times.
	203	!-- Also allocate array for particle tail coordinates, if needed.
	204	ALLOCATE( prt_count(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	205	prt_start_index(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	206	particle_mask(maximum_number_of_particles), &
	207	particles(maximum_number_of_particles) )
	208
	209	!
	210	!-- Initialize all particles with dummy values (otherwise errors may
	211	!-- occur within restart runs). The reason for this is still not clear
	212	!-- and may be presumably caused by errors in the respective user-interface.
	213	particles = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
	214	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
[57]	215	0.0, 0, 0, 0, 0 )
[1]	216	particle_groups = particle_groups_type( 0.0, 0.0, 0.0, 0.0 )
	217
	218	!
	219	!-- Set the default particle size used for dvrp plots
	220	IF ( dvrp_psize == 9999999.9 ) dvrp_psize = 0.2 * dx
	221
	222	!
	223	!-- Set values for the density ratio and radius for all particle
	224	!-- groups, if necessary
	225	IF ( density_ratio(1) == 9999999.9 ) density_ratio(1) = 0.0
	226	IF ( radius(1) == 9999999.9 ) radius(1) = 0.0
	227	DO i = 2, number_of_particle_groups
	228	IF ( density_ratio(i) == 9999999.9 ) THEN
	229	density_ratio(i) = density_ratio(i-1)
	230	ENDIF
	231	IF ( radius(i) == 9999999.9 ) radius(i) = radius(i-1)
	232	ENDDO
	233
	234	DO i = 1, number_of_particle_groups
	235	IF ( density_ratio(i) /= 0.0 .AND. radius(i) == 0 ) THEN
[254]	236	WRITE( message_string, * ) 'particle group #', i, 'has a', &
	237	'density ratio /= 0 but radius = 0'
	238	CALL message( 'init_particles', 'PA0215', 1, 2, 0, 6, 0 )
[1]	239	ENDIF
	240	particle_groups(i)%density_ratio = density_ratio(i)
	241	particle_groups(i)%radius = radius(i)
	242	ENDDO
	243
	244	!
	245	!-- Calculate particle positions and store particle attributes, if
	246	!-- particle is situated on this PE
	247	n = 0
	248
	249	DO i = 1, number_of_particle_groups
	250
	251	pos_z = psb(i)
	252
	253	DO WHILE ( pos_z <= pst(i) )
	254
	255	pos_y = pss(i)
	256
	257	DO WHILE ( pos_y <= psn(i) )
	258
	259	IF ( pos_y >= ( nys - 0.5 ) * dy .AND. &
	260	pos_y < ( nyn + 0.5 ) * dy ) THEN
	261
	262	pos_x = psl(i)
	263
	264	DO WHILE ( pos_x <= psr(i) )
	265
	266	IF ( pos_x >= ( nxl - 0.5 ) * dx .AND. &
	267	pos_x < ( nxr + 0.5 ) * dx ) THEN
	268
	269	DO j = 1, particles_per_point
	270
	271	n = n + 1
	272	IF ( n > maximum_number_of_particles ) THEN
[254]	273	WRITE( message_string, * ) 'number of initial', &
[274]	274	'particles (', n, ') exceeds', &
	275	'&maximum_number_of_particles (', &
	276	maximum_number_of_particles, ') on PE ', &
[254]	277	myid
[274]	278	CALL message( 'init_particles', 'PA0216', &
[277]	279	2, 2, -1, 6, 1 )
[1]	280	ENDIF
	281	particles(n)%x = pos_x
	282	particles(n)%y = pos_y
	283	particles(n)%z = pos_z
	284	particles(n)%age = 0.0
[57]	285	particles(n)%age_m = 0.0
[1]	286	particles(n)%dt_sum = 0.0
	287	particles(n)%dvrp_psize = dvrp_psize
	288	particles(n)%e_m = 0.0
	289	particles(n)%speed_x = 0.0
	290	particles(n)%speed_x_sgs = 0.0
	291	particles(n)%speed_y = 0.0
	292	particles(n)%speed_y_sgs = 0.0
	293	particles(n)%speed_z = 0.0
	294	particles(n)%speed_z_sgs = 0.0
	295	particles(n)%origin_x = pos_x
	296	particles(n)%origin_y = pos_y
	297	particles(n)%origin_z = pos_z
	298	particles(n)%radius = particle_groups(i)%radius
	299	particles(n)%weight_factor =initial_weighting_factor
	300	particles(n)%color = 1
	301	particles(n)%group = i
	302	particles(n)%tailpoints = 0
	303	IF ( use_particle_tails .AND. &
	304	MOD( n, skip_particles_for_tail ) == 0 ) THEN
	305	number_of_tails = number_of_tails + 1
	306	!
	307	!-- This is a temporary provisional setting (see
	308	!-- further below!)
	309	particles(n)%tail_id = number_of_tails
	310	ELSE
	311	particles(n)%tail_id = 0
	312	ENDIF
	313
	314	ENDDO
	315
	316	ENDIF
	317
	318	pos_x = pos_x + pdx(i)
	319
	320	ENDDO
	321
	322	ENDIF
	323
	324	pos_y = pos_y + pdy(i)
	325
	326	ENDDO
	327
	328	pos_z = pos_z + pdz(i)
	329
	330	ENDDO
	331
	332	ENDDO
	333
	334	number_of_initial_particles = n
	335	number_of_particles = n
	336
	337	!
	338	!-- Calculate the number of particles and tails of the total domain
	339	#if defined( __parallel )
	340	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
[16]	341	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	342	CALL MPI_ALLREDUCE( number_of_tails, total_number_of_tails, 1, &
[16]	343	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	344	#else
	345	total_number_of_particles = number_of_particles
	346	total_number_of_tails = number_of_tails
	347	#endif
	348
	349	!
	350	!-- Set a seed value for the random number generator to be exclusively
	351	!-- used for the particle code. The generated random numbers should be
	352	!-- different on the different PEs.
	353	iran_part = iran_part + myid
	354
	355	!
	356	!-- User modification of initial particles
	357	CALL user_init_particles
	358
	359	!
	360	!-- Store the initial set of particles for release at later times
	361	IF ( number_of_initial_particles /= 0 ) THEN
	362	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	363	initial_particles(1:number_of_initial_particles) = &
	364	particles(1:number_of_initial_particles)
	365	ENDIF
	366
	367	!
	368	!-- Add random fluctuation to particle positions
	369	IF ( random_start_position ) THEN
	370
	371	DO n = 1, number_of_initial_particles
	372	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
	373	particles(n)%x = particles(n)%x + &
[106]	374	( random_function( iran_part ) - 0.5 ) * &
[1]	375	pdx(particles(n)%group)
	376	IF ( particles(n)%x <= ( nxl - 0.5 ) * dx ) THEN
	377	particles(n)%x = ( nxl - 0.4999999999 ) * dx
	378	ELSEIF ( particles(n)%x >= ( nxr + 0.5 ) * dx ) THEN
	379	particles(n)%x = ( nxr + 0.4999999999 ) * dx
	380	ENDIF
	381	ENDIF
	382	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
	383	particles(n)%y = particles(n)%y + &
[106]	384	( random_function( iran_part ) - 0.5 ) * &
[1]	385	pdy(particles(n)%group)
	386	IF ( particles(n)%y <= ( nys - 0.5 ) * dy ) THEN
	387	particles(n)%y = ( nys - 0.4999999999 ) * dy
	388	ELSEIF ( particles(n)%y >= ( nyn + 0.5 ) * dy ) THEN
	389	particles(n)%y = ( nyn + 0.4999999999 ) * dy
	390	ENDIF
	391	ENDIF
	392	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
	393	particles(n)%z = particles(n)%z + &
[106]	394	( random_function( iran_part ) - 0.5 ) * &
[1]	395	pdz(particles(n)%group)
	396	ENDIF
	397	ENDDO
	398	ENDIF
	399
	400	!
[117]	401	!-- Sort particles in the sequence the gridboxes are stored in the memory.
	402	!-- Only required if cloud droplets are used.
	403	IF ( cloud_droplets ) CALL sort_particles
[1]	404
	405	!
	406	!-- Open file for statistical informations about particle conditions
	407	IF ( write_particle_statistics ) THEN
	408	CALL check_open( 80 )
	409	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
	410	number_of_initial_particles, &
	411	maximum_number_of_particles
	412	CALL close_file( 80 )
	413	ENDIF
	414
	415	!
	416	!-- Check if particles are really uniform in color and radius (dvrp_size)
	417	!-- (uniform_particles is preset TRUE)
	418	IF ( uniform_particles ) THEN
	419	IF ( number_of_initial_particles == 0 ) THEN
	420	uniform_particles_l = .TRUE.
	421	ELSE
	422	n = number_of_initial_particles
	423	IF ( MINVAL( particles(1:n)%dvrp_psize ) == &
	424	MAXVAL( particles(1:n)%dvrp_psize ) .AND. &
	425	MINVAL( particles(1:n)%color ) == &
	426	MAXVAL( particles(1:n)%color ) ) THEN
	427	uniform_particles_l = .TRUE.
	428	ELSE
	429	uniform_particles_l = .FALSE.
	430	ENDIF
	431	ENDIF
	432
	433	#if defined( __parallel )
	434	CALL MPI_ALLREDUCE( uniform_particles_l, uniform_particles, 1, &
	435	MPI_LOGICAL, MPI_LAND, comm2d, ierr )
	436	#else
	437	uniform_particles = uniform_particles_l
	438	#endif
	439
	440	ENDIF
	441
	442	!
	443	!-- Set the beginning of the particle tails and their age
	444	IF ( use_particle_tails ) THEN
	445	!
[276]	446	!-- Choose the maximum number of tails with respect to the maximum number
	447	!-- of particles and skip_particles_for_tail
	448	maximum_number_of_tails = maximum_number_of_particles / &
	449	skip_particles_for_tail
	450
[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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