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source: palm/trunk/SOURCE/init_particles.f90 @ 679

Last change on this file since 679 was 668, checked in by suehring, 14 years ago
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[1]	1	SUBROUTINE init_particles
	2
	3	!------------------------------------------------------------------------------!
[254]	4	! Current revisions:
[1]	5	! -----------------
[392]	6	!
	7	! Former revisions:
	8	! -----------------
	9	! $Id: init_particles.f90 668 2010-12-23 13:22:58Z raasch $
	10	!
[668]	11	! 667 2010-12-23 12:06:00Z suehring/gryschka
	12	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
	13	! of arrays.
	14	!
[623]	15	! 622 2010-12-10 08:08:13Z raasch
	16	! optional barriers included in order to speed up collective operations
	17	!
[392]	18	! 336 2009-06-10 11:19:35Z raasch
[276]	19	! Maximum number of tails is calculated from maximum number of particles and
	20	! skip_particles_for_tail,
	21	! output of messages replaced by message handling routine
[229]	22	! Bugfix: arrays for tails are allocated with a minimum size of 10 tails if
	23	! there is no tail initially
[1]	24	!
[198]	25	! 150 2008-02-29 08:19:58Z raasch
	26	! Setting offset_ocean_* needed for calculating vertical indices within ocean
	27	! runs
	28	!
[139]	29	! 117 2007-10-11 03:27:59Z raasch
	30	! Sorting of particles only in case of cloud droplets
	31	!
[110]	32	! 106 2007-08-16 14:30:26Z raasch
	33	! variable iran replaced by iran_part
	34	!
[83]	35	! 82 2007-04-16 15:40:52Z raasch
	36	! Preprocessor directives for old systems removed
	37	!
[77]	38	! 70 2007-03-18 23:46:30Z raasch
	39	! displacements for mpi_particle_type changed, age_m initialized,
	40	! particles-package is now part of the default code
	41	!
[39]	42	! 16 2007-02-15 13:16:47Z raasch
	43	! Bugfix: MPI_REAL in MPI_ALLREDUCE replaced by MPI_INTEGER
	44	!
	45	! r4 \| raasch \| 2007-02-13 12:33:16 +0100 (Tue, 13 Feb 2007)
[3]	46	! RCS Log replace by Id keyword, revision history cleaned up
	47	!
[1]	48	! Revision 1.24 2007/02/11 13:00:17 raasch
	49	! Bugfix: allocation of tail_mask and new_tail_id in case of restart-runs
	50	! Bugfix: __ was missing in a cpp-directive
	51	!
	52	! Revision 1.1 1999/11/25 16:22:38 raasch
	53	! Initial revision
	54	!
	55	!
	56	! Description:
	57	! ------------
	58	! This routine initializes a set of particles and their attributes (position,
	59	! radius, ..). Advection of these particles is carried out by advec_particles,
	60	! plotting is done in data_output_dvrp.
	61	!------------------------------------------------------------------------------!
	62
	63	USE arrays_3d
	64	USE control_parameters
[336]	65	USE dvrp_variables
[1]	66	USE grid_variables
	67	USE indices
	68	USE particle_attributes
	69	USE pegrid
	70	USE random_function_mod
	71
	72
	73	IMPLICIT NONE
	74
	75	CHARACTER (LEN=10) :: particle_binary_version, version_on_file
	76
	77	INTEGER :: i, j, n, nn
	78	#if defined( __parallel )
	79	INTEGER, DIMENSION(3) :: blocklengths, displacements, types
	80	#endif
	81	LOGICAL :: uniform_particles_l
	82	REAL :: factor, pos_x, pos_y, pos_z, value
	83
	84
	85	#if defined( __parallel )
	86	!
	87	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
[82]	88	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
	89	blocklengths(1) = 19; blocklengths(2) = 4; blocklengths(3) = 1
	90	displacements(1) = 0; displacements(2) = 152; displacements(3) = 168
	91
[1]	92	types(1) = MPI_REAL
	93	types(2) = MPI_INTEGER
	94	types(3) = MPI_UB
	95	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
	96	mpi_particle_type, ierr )
	97	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
	98	#endif
	99
	100	!
[150]	101	!-- In case of oceans runs, the vertical index calculations need an offset,
	102	!-- because otherwise the k indices will become negative
	103	IF ( ocean ) THEN
	104	offset_ocean_nzt = nzt
	105	offset_ocean_nzt_m1 = nzt - 1
	106	ENDIF
	107
	108
	109	!
[1]	110	!-- Check the number of particle groups.
	111	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
[274]	112	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
	113	max_number_of_particle_groups , &
[254]	114	'&number_of_particle_groups reset to ', &
	115	max_number_of_particle_groups
	116	CALL message( 'init_particles', 'PA0213', 0, 1, 0, 6, 0 )
[1]	117	number_of_particle_groups = max_number_of_particle_groups
	118	ENDIF
	119
	120	!
	121	!-- Set default start positions, if necessary
	122	IF ( psl(1) == 9999999.9 ) psl(1) = -0.5 * dx
	123	IF ( psr(1) == 9999999.9 ) psr(1) = ( nx + 0.5 ) * dx
	124	IF ( pss(1) == 9999999.9 ) pss(1) = -0.5 * dy
	125	IF ( psn(1) == 9999999.9 ) psn(1) = ( ny + 0.5 ) * dy
	126	IF ( psb(1) == 9999999.9 ) psb(1) = zu(nz/2)
	127	IF ( pst(1) == 9999999.9 ) pst(1) = psb(1)
	128
	129	IF ( pdx(1) == 9999999.9 .OR. pdx(1) == 0.0 ) pdx(1) = dx
	130	IF ( pdy(1) == 9999999.9 .OR. pdy(1) == 0.0 ) pdy(1) = dy
	131	IF ( pdz(1) == 9999999.9 .OR. pdz(1) == 0.0 ) pdz(1) = zu(2) - zu(1)
	132
	133	DO j = 2, number_of_particle_groups
	134	IF ( psl(j) == 9999999.9 ) psl(j) = psl(j-1)
	135	IF ( psr(j) == 9999999.9 ) psr(j) = psr(j-1)
	136	IF ( pss(j) == 9999999.9 ) pss(j) = pss(j-1)
	137	IF ( psn(j) == 9999999.9 ) psn(j) = psn(j-1)
	138	IF ( psb(j) == 9999999.9 ) psb(j) = psb(j-1)
	139	IF ( pst(j) == 9999999.9 ) pst(j) = pst(j-1)
	140	IF ( pdx(j) == 9999999.9 .OR. pdx(j) == 0.0 ) pdx(j) = pdx(j-1)
	141	IF ( pdy(j) == 9999999.9 .OR. pdy(j) == 0.0 ) pdy(j) = pdy(j-1)
	142	IF ( pdz(j) == 9999999.9 .OR. pdz(j) == 0.0 ) pdz(j) = pdz(j-1)
	143	ENDDO
	144
	145	!
	146	!-- For the first model run of a possible job chain initialize the
	147	!-- particles, otherwise read the particle data from file.
	148	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
	149	.AND. read_particles_from_restartfile ) THEN
	150
	151	!
	152	!-- Read particle data from previous model run.
	153	!-- First open the input unit.
	154	IF ( myid_char == '' ) THEN
	155	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN'//myid_char, &
	156	FORM='UNFORMATTED' )
	157	ELSE
	158	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN/'//myid_char, &
	159	FORM='UNFORMATTED' )
	160	ENDIF
	161
	162	!
	163	!-- First compare the version numbers
	164	READ ( 90 ) version_on_file
	165	particle_binary_version = '3.0'
	166	IF ( TRIM( version_on_file ) /= TRIM( particle_binary_version ) ) THEN
[274]	167	message_string = 'version mismatch concerning data from prior ' // &
	168	'run &version on file = "' // &
	169	TRIM( version_on_file ) // &
	170	'&version in program = "' // &
	171	TRIM( particle_binary_version ) // '"'
[254]	172	CALL message( 'init_particles', 'PA0214', 1, 2, 0, 6, 0 )
[1]	173	ENDIF
	174
	175	!
	176	!-- Read some particle parameters and the size of the particle arrays,
	177	!-- allocate them and read their contents.
	178	READ ( 90 ) bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
	179	maximum_number_of_particles, maximum_number_of_tailpoints, &
	180	maximum_number_of_tails, number_of_initial_particles, &
	181	number_of_particles, number_of_particle_groups, &
	182	number_of_tails, particle_groups, time_prel, &
	183	time_write_particle_data, uniform_particles
	184
	185	IF ( number_of_initial_particles /= 0 ) THEN
	186	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	187	READ ( 90 ) initial_particles
	188	ENDIF
	189
[667]	190	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	191	prt_start_index(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
[1]	192	particle_mask(maximum_number_of_particles), &
	193	particles(maximum_number_of_particles) )
	194
	195	READ ( 90 ) prt_count, prt_start_index
	196	READ ( 90 ) particles
	197
	198	IF ( use_particle_tails ) THEN
	199	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
	200	maximum_number_of_tails), &
	201	new_tail_id(maximum_number_of_tails), &
	202	tail_mask(maximum_number_of_tails) )
	203	READ ( 90 ) particle_tail_coordinates
	204	ENDIF
	205
	206	CLOSE ( 90 )
	207
	208	ELSE
	209
	210	!
	211	!-- Allocate particle arrays and set attributes of the initial set of
	212	!-- particles, which can be also periodically released at later times.
	213	!-- Also allocate array for particle tail coordinates, if needed.
[667]	214	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	215	prt_start_index(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
[1]	216	particle_mask(maximum_number_of_particles), &
	217	particles(maximum_number_of_particles) )
	218
	219	!
	220	!-- Initialize all particles with dummy values (otherwise errors may
	221	!-- occur within restart runs). The reason for this is still not clear
	222	!-- and may be presumably caused by errors in the respective user-interface.
	223	particles = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
	224	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
[57]	225	0.0, 0, 0, 0, 0 )
[1]	226	particle_groups = particle_groups_type( 0.0, 0.0, 0.0, 0.0 )
	227
	228	!
	229	!-- Set the default particle size used for dvrp plots
	230	IF ( dvrp_psize == 9999999.9 ) dvrp_psize = 0.2 * dx
	231
	232	!
	233	!-- Set values for the density ratio and radius for all particle
	234	!-- groups, if necessary
	235	IF ( density_ratio(1) == 9999999.9 ) density_ratio(1) = 0.0
	236	IF ( radius(1) == 9999999.9 ) radius(1) = 0.0
	237	DO i = 2, number_of_particle_groups
	238	IF ( density_ratio(i) == 9999999.9 ) THEN
	239	density_ratio(i) = density_ratio(i-1)
	240	ENDIF
	241	IF ( radius(i) == 9999999.9 ) radius(i) = radius(i-1)
	242	ENDDO
	243
	244	DO i = 1, number_of_particle_groups
	245	IF ( density_ratio(i) /= 0.0 .AND. radius(i) == 0 ) THEN
[254]	246	WRITE( message_string, * ) 'particle group #', i, 'has a', &
	247	'density ratio /= 0 but radius = 0'
	248	CALL message( 'init_particles', 'PA0215', 1, 2, 0, 6, 0 )
[1]	249	ENDIF
	250	particle_groups(i)%density_ratio = density_ratio(i)
	251	particle_groups(i)%radius = radius(i)
	252	ENDDO
	253
	254	!
	255	!-- Calculate particle positions and store particle attributes, if
	256	!-- particle is situated on this PE
	257	n = 0
	258
	259	DO i = 1, number_of_particle_groups
	260
	261	pos_z = psb(i)
	262
	263	DO WHILE ( pos_z <= pst(i) )
	264
	265	pos_y = pss(i)
	266
	267	DO WHILE ( pos_y <= psn(i) )
	268
	269	IF ( pos_y >= ( nys - 0.5 ) * dy .AND. &
	270	pos_y < ( nyn + 0.5 ) * dy ) THEN
	271
	272	pos_x = psl(i)
	273
	274	DO WHILE ( pos_x <= psr(i) )
	275
	276	IF ( pos_x >= ( nxl - 0.5 ) * dx .AND. &
	277	pos_x < ( nxr + 0.5 ) * dx ) THEN
	278
	279	DO j = 1, particles_per_point
	280
	281	n = n + 1
	282	IF ( n > maximum_number_of_particles ) THEN
[254]	283	WRITE( message_string, * ) 'number of initial', &
[274]	284	'particles (', n, ') exceeds', &
	285	'&maximum_number_of_particles (', &
	286	maximum_number_of_particles, ') on PE ', &
[254]	287	myid
[274]	288	CALL message( 'init_particles', 'PA0216', &
[277]	289	2, 2, -1, 6, 1 )
[1]	290	ENDIF
	291	particles(n)%x = pos_x
	292	particles(n)%y = pos_y
	293	particles(n)%z = pos_z
	294	particles(n)%age = 0.0
[57]	295	particles(n)%age_m = 0.0
[1]	296	particles(n)%dt_sum = 0.0
	297	particles(n)%dvrp_psize = dvrp_psize
	298	particles(n)%e_m = 0.0
	299	particles(n)%speed_x = 0.0
	300	particles(n)%speed_x_sgs = 0.0
	301	particles(n)%speed_y = 0.0
	302	particles(n)%speed_y_sgs = 0.0
	303	particles(n)%speed_z = 0.0
	304	particles(n)%speed_z_sgs = 0.0
	305	particles(n)%origin_x = pos_x
	306	particles(n)%origin_y = pos_y
	307	particles(n)%origin_z = pos_z
	308	particles(n)%radius = particle_groups(i)%radius
	309	particles(n)%weight_factor =initial_weighting_factor
	310	particles(n)%color = 1
	311	particles(n)%group = i
	312	particles(n)%tailpoints = 0
	313	IF ( use_particle_tails .AND. &
	314	MOD( n, skip_particles_for_tail ) == 0 ) THEN
	315	number_of_tails = number_of_tails + 1
	316	!
	317	!-- This is a temporary provisional setting (see
	318	!-- further below!)
	319	particles(n)%tail_id = number_of_tails
	320	ELSE
	321	particles(n)%tail_id = 0
	322	ENDIF
	323
	324	ENDDO
	325
	326	ENDIF
	327
	328	pos_x = pos_x + pdx(i)
	329
	330	ENDDO
	331
	332	ENDIF
	333
	334	pos_y = pos_y + pdy(i)
	335
	336	ENDDO
	337
	338	pos_z = pos_z + pdz(i)
	339
	340	ENDDO
	341
	342	ENDDO
	343
	344	number_of_initial_particles = n
	345	number_of_particles = n
	346
	347	!
	348	!-- Calculate the number of particles and tails of the total domain
	349	#if defined( __parallel )
[622]	350	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[1]	351	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
[16]	352	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[622]	353	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[1]	354	CALL MPI_ALLREDUCE( number_of_tails, total_number_of_tails, 1, &
[16]	355	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	356	#else
	357	total_number_of_particles = number_of_particles
	358	total_number_of_tails = number_of_tails
	359	#endif
	360
	361	!
	362	!-- Set a seed value for the random number generator to be exclusively
	363	!-- used for the particle code. The generated random numbers should be
	364	!-- different on the different PEs.
	365	iran_part = iran_part + myid
	366
	367	!
	368	!-- User modification of initial particles
	369	CALL user_init_particles
	370
	371	!
	372	!-- Store the initial set of particles for release at later times
	373	IF ( number_of_initial_particles /= 0 ) THEN
	374	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	375	initial_particles(1:number_of_initial_particles) = &
	376	particles(1:number_of_initial_particles)
	377	ENDIF
	378
	379	!
	380	!-- Add random fluctuation to particle positions
	381	IF ( random_start_position ) THEN
	382
	383	DO n = 1, number_of_initial_particles
	384	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
	385	particles(n)%x = particles(n)%x + &
[106]	386	( random_function( iran_part ) - 0.5 ) * &
[1]	387	pdx(particles(n)%group)
	388	IF ( particles(n)%x <= ( nxl - 0.5 ) * dx ) THEN
	389	particles(n)%x = ( nxl - 0.4999999999 ) * dx
	390	ELSEIF ( particles(n)%x >= ( nxr + 0.5 ) * dx ) THEN
	391	particles(n)%x = ( nxr + 0.4999999999 ) * dx
	392	ENDIF
	393	ENDIF
	394	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
	395	particles(n)%y = particles(n)%y + &
[106]	396	( random_function( iran_part ) - 0.5 ) * &
[1]	397	pdy(particles(n)%group)
	398	IF ( particles(n)%y <= ( nys - 0.5 ) * dy ) THEN
	399	particles(n)%y = ( nys - 0.4999999999 ) * dy
	400	ELSEIF ( particles(n)%y >= ( nyn + 0.5 ) * dy ) THEN
	401	particles(n)%y = ( nyn + 0.4999999999 ) * dy
	402	ENDIF
	403	ENDIF
	404	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
	405	particles(n)%z = particles(n)%z + &
[106]	406	( random_function( iran_part ) - 0.5 ) * &
[1]	407	pdz(particles(n)%group)
	408	ENDIF
	409	ENDDO
	410	ENDIF
	411
	412	!
[117]	413	!-- Sort particles in the sequence the gridboxes are stored in the memory.
	414	!-- Only required if cloud droplets are used.
	415	IF ( cloud_droplets ) CALL sort_particles
[1]	416
	417	!
	418	!-- Open file for statistical informations about particle conditions
	419	IF ( write_particle_statistics ) THEN
	420	CALL check_open( 80 )
	421	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
	422	number_of_initial_particles, &
	423	maximum_number_of_particles
	424	CALL close_file( 80 )
	425	ENDIF
	426
	427	!
	428	!-- Check if particles are really uniform in color and radius (dvrp_size)
	429	!-- (uniform_particles is preset TRUE)
	430	IF ( uniform_particles ) THEN
	431	IF ( number_of_initial_particles == 0 ) THEN
	432	uniform_particles_l = .TRUE.
	433	ELSE
	434	n = number_of_initial_particles
	435	IF ( MINVAL( particles(1:n)%dvrp_psize ) == &
	436	MAXVAL( particles(1:n)%dvrp_psize ) .AND. &
	437	MINVAL( particles(1:n)%color ) == &
	438	MAXVAL( particles(1:n)%color ) ) THEN
	439	uniform_particles_l = .TRUE.
	440	ELSE
	441	uniform_particles_l = .FALSE.
	442	ENDIF
	443	ENDIF
	444
	445	#if defined( __parallel )
[622]	446	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[1]	447	CALL MPI_ALLREDUCE( uniform_particles_l, uniform_particles, 1, &
	448	MPI_LOGICAL, MPI_LAND, comm2d, ierr )
	449	#else
	450	uniform_particles = uniform_particles_l
	451	#endif
	452
	453	ENDIF
	454
	455	!
[336]	456	!-- Particles will probably become none-uniform, if their size and color
	457	!-- will be determined by flow variables
	458	IF ( particle_color /= 'none' .OR. particle_dvrpsize /= 'none' ) THEN
	459	uniform_particles = .FALSE.
	460	ENDIF
	461
	462	!
[1]	463	!-- Set the beginning of the particle tails and their age
	464	IF ( use_particle_tails ) THEN
	465	!
[276]	466	!-- Choose the maximum number of tails with respect to the maximum number
	467	!-- of particles and skip_particles_for_tail
	468	maximum_number_of_tails = maximum_number_of_particles / &
	469	skip_particles_for_tail
	470
[229]	471	!
	472	!-- Create a minimum number of tails in case that there is no tail
	473	!-- initially (otherwise, index errors will occur when adressing the
	474	!-- arrays below)
	475	IF ( maximum_number_of_tails == 0 ) maximum_number_of_tails = 10
[1]	476
	477	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
	478	maximum_number_of_tails), &
	479	new_tail_id(maximum_number_of_tails), &
	480	tail_mask(maximum_number_of_tails) )
	481
	482	particle_tail_coordinates = 0.0
	483	minimum_tailpoint_distance = minimum_tailpoint_distance**2
	484	number_of_initial_tails = number_of_tails
	485
	486	nn = 0
	487	DO n = 1, number_of_particles
	488	!
	489	!-- Only for those particles marked above with a provisional tail_id
	490	!-- tails will be created. Particles now get their final tail_id.
	491	IF ( particles(n)%tail_id /= 0 ) THEN
	492
	493	nn = nn + 1
	494	particles(n)%tail_id = nn
	495
	496	particle_tail_coordinates(1,1,nn) = particles(n)%x
	497	particle_tail_coordinates(1,2,nn) = particles(n)%y
	498	particle_tail_coordinates(1,3,nn) = particles(n)%z
	499	particle_tail_coordinates(1,4,nn) = particles(n)%color
	500	particles(n)%tailpoints = 1
	501	IF ( minimum_tailpoint_distance /= 0.0 ) THEN
	502	particle_tail_coordinates(2,1,nn) = particles(n)%x
	503	particle_tail_coordinates(2,2,nn) = particles(n)%y
	504	particle_tail_coordinates(2,3,nn) = particles(n)%z
	505	particle_tail_coordinates(2,4,nn) = particles(n)%color
	506	particle_tail_coordinates(1:2,5,nn) = 0.0
	507	particles(n)%tailpoints = 2
	508	ENDIF
	509
	510	ENDIF
	511	ENDDO
	512	ENDIF
	513
	514	!
	515	!-- Plot initial positions of particles (only if particle advection is
	516	!-- switched on from the beginning of the simulation (t=0))
	517	IF ( particle_advection_start == 0.0 ) CALL data_output_dvrp
	518
	519	ENDIF
	520
	521	!
	522	!-- Check boundary condition and set internal variables
	523	SELECT CASE ( bc_par_b )
	524
	525	CASE ( 'absorb' )
	526	ibc_par_b = 1
	527
	528	CASE ( 'reflect' )
	529	ibc_par_b = 2
	530
	531	CASE DEFAULT
[254]	532	WRITE( message_string, * ) 'unknown boundary condition ', &
	533	'bc_par_b = "', TRIM( bc_par_b ), '"'
	534	CALL message( 'init_particles', 'PA0217', 1, 2, 0, 6, 0 )
[1]	535
	536	END SELECT
	537	SELECT CASE ( bc_par_t )
	538
	539	CASE ( 'absorb' )
	540	ibc_par_t = 1
	541
	542	CASE ( 'reflect' )
	543	ibc_par_t = 2
	544
	545	CASE DEFAULT
[254]	546	WRITE( message_string, * ) 'unknown boundary condition ', &
	547	'bc_par_t = "', TRIM( bc_par_t ), '"'
	548	CALL message( 'init_particles', 'PA0218', 1, 2, 0, 6, 0 )
[1]	549
	550	END SELECT
	551	SELECT CASE ( bc_par_lr )
	552
	553	CASE ( 'cyclic' )
	554	ibc_par_lr = 0
	555
	556	CASE ( 'absorb' )
	557	ibc_par_lr = 1
	558
	559	CASE ( 'reflect' )
	560	ibc_par_lr = 2
	561
	562	CASE DEFAULT
[254]	563	WRITE( message_string, * ) 'unknown boundary condition ', &
	564	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
	565	CALL message( 'init_particles', 'PA0219', 1, 2, 0, 6, 0 )
[1]	566
	567	END SELECT
	568	SELECT CASE ( bc_par_ns )
	569
	570	CASE ( 'cyclic' )
	571	ibc_par_ns = 0
	572
	573	CASE ( 'absorb' )
	574	ibc_par_ns = 1
	575
	576	CASE ( 'reflect' )
	577	ibc_par_ns = 2
	578
	579	CASE DEFAULT
[254]	580	WRITE( message_string, * ) 'unknown boundary condition ', &
	581	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
	582	CALL message( 'init_particles', 'PA0220', 1, 2, 0, 6, 0 )
[1]	583
	584	END SELECT
	585	!
	586	!-- Formats
	587	8000 FORMAT (I6,1X,F7.2,4X,I6,71X,I6)
	588
	589	END SUBROUTINE init_particles

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