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source: palm/trunk/SOURCE/init_particles.f90 @ 808

Last change on this file since 808 was 792, checked in by raasch, 13 years ago
further adjustments for speedup of particle code
Property svn:keywords set to `Id`
File size: 22.8 KB

Rev	Line
[1]	1	SUBROUTINE init_particles
	2
	3	!------------------------------------------------------------------------------!
[254]	4	! Current revisions:
[1]	5	! -----------------
[792]	6	! array particles implemented as pointer
[392]	7	!
	8	! Former revisions:
	9	! -----------------
	10	! $Id: init_particles.f90 792 2011-12-01 00:23:23Z maronga $
	11	!
[668]	12	! 667 2010-12-23 12:06:00Z suehring/gryschka
	13	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
	14	! of arrays.
	15	!
[623]	16	! 622 2010-12-10 08:08:13Z raasch
	17	! optional barriers included in order to speed up collective operations
	18	!
[392]	19	! 336 2009-06-10 11:19:35Z raasch
[276]	20	! Maximum number of tails is calculated from maximum number of particles and
	21	! skip_particles_for_tail,
	22	! output of messages replaced by message handling routine
[229]	23	! Bugfix: arrays for tails are allocated with a minimum size of 10 tails if
	24	! there is no tail initially
[1]	25	!
[198]	26	! 150 2008-02-29 08:19:58Z raasch
	27	! Setting offset_ocean_* needed for calculating vertical indices within ocean
	28	! runs
	29	!
[139]	30	! 117 2007-10-11 03:27:59Z raasch
	31	! Sorting of particles only in case of cloud droplets
	32	!
[110]	33	! 106 2007-08-16 14:30:26Z raasch
	34	! variable iran replaced by iran_part
	35	!
[83]	36	! 82 2007-04-16 15:40:52Z raasch
	37	! Preprocessor directives for old systems removed
	38	!
[77]	39	! 70 2007-03-18 23:46:30Z raasch
	40	! displacements for mpi_particle_type changed, age_m initialized,
	41	! particles-package is now part of the default code
	42	!
[39]	43	! 16 2007-02-15 13:16:47Z raasch
	44	! Bugfix: MPI_REAL in MPI_ALLREDUCE replaced by MPI_INTEGER
	45	!
	46	! r4 \| raasch \| 2007-02-13 12:33:16 +0100 (Tue, 13 Feb 2007)
[3]	47	! RCS Log replace by Id keyword, revision history cleaned up
	48	!
[1]	49	! Revision 1.24 2007/02/11 13:00:17 raasch
	50	! Bugfix: allocation of tail_mask and new_tail_id in case of restart-runs
	51	! Bugfix: __ was missing in a cpp-directive
	52	!
	53	! Revision 1.1 1999/11/25 16:22:38 raasch
	54	! Initial revision
	55	!
	56	!
	57	! Description:
	58	! ------------
	59	! This routine initializes a set of particles and their attributes (position,
	60	! radius, ..). Advection of these particles is carried out by advec_particles,
	61	! plotting is done in data_output_dvrp.
	62	!------------------------------------------------------------------------------!
	63
	64	USE arrays_3d
	65	USE control_parameters
[336]	66	USE dvrp_variables
[1]	67	USE grid_variables
	68	USE indices
	69	USE particle_attributes
	70	USE pegrid
	71	USE random_function_mod
	72
	73
	74	IMPLICIT NONE
	75
	76	CHARACTER (LEN=10) :: particle_binary_version, version_on_file
	77
	78	INTEGER :: i, j, n, nn
	79	#if defined( __parallel )
	80	INTEGER, DIMENSION(3) :: blocklengths, displacements, types
	81	#endif
	82	LOGICAL :: uniform_particles_l
	83	REAL :: factor, pos_x, pos_y, pos_z, value
	84
	85
	86	#if defined( __parallel )
	87	!
	88	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
[82]	89	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
	90	blocklengths(1) = 19; blocklengths(2) = 4; blocklengths(3) = 1
	91	displacements(1) = 0; displacements(2) = 152; displacements(3) = 168
	92
[1]	93	types(1) = MPI_REAL
	94	types(2) = MPI_INTEGER
	95	types(3) = MPI_UB
	96	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
	97	mpi_particle_type, ierr )
	98	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
	99	#endif
	100
	101	!
[150]	102	!-- In case of oceans runs, the vertical index calculations need an offset,
	103	!-- because otherwise the k indices will become negative
	104	IF ( ocean ) THEN
	105	offset_ocean_nzt = nzt
	106	offset_ocean_nzt_m1 = nzt - 1
	107	ENDIF
	108
	109
	110	!
[1]	111	!-- Check the number of particle groups.
	112	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
[274]	113	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
	114	max_number_of_particle_groups , &
[254]	115	'&number_of_particle_groups reset to ', &
	116	max_number_of_particle_groups
	117	CALL message( 'init_particles', 'PA0213', 0, 1, 0, 6, 0 )
[1]	118	number_of_particle_groups = max_number_of_particle_groups
	119	ENDIF
	120
	121	!
	122	!-- Set default start positions, if necessary
	123	IF ( psl(1) == 9999999.9 ) psl(1) = -0.5 * dx
	124	IF ( psr(1) == 9999999.9 ) psr(1) = ( nx + 0.5 ) * dx
	125	IF ( pss(1) == 9999999.9 ) pss(1) = -0.5 * dy
	126	IF ( psn(1) == 9999999.9 ) psn(1) = ( ny + 0.5 ) * dy
	127	IF ( psb(1) == 9999999.9 ) psb(1) = zu(nz/2)
	128	IF ( pst(1) == 9999999.9 ) pst(1) = psb(1)
	129
	130	IF ( pdx(1) == 9999999.9 .OR. pdx(1) == 0.0 ) pdx(1) = dx
	131	IF ( pdy(1) == 9999999.9 .OR. pdy(1) == 0.0 ) pdy(1) = dy
	132	IF ( pdz(1) == 9999999.9 .OR. pdz(1) == 0.0 ) pdz(1) = zu(2) - zu(1)
	133
	134	DO j = 2, number_of_particle_groups
	135	IF ( psl(j) == 9999999.9 ) psl(j) = psl(j-1)
	136	IF ( psr(j) == 9999999.9 ) psr(j) = psr(j-1)
	137	IF ( pss(j) == 9999999.9 ) pss(j) = pss(j-1)
	138	IF ( psn(j) == 9999999.9 ) psn(j) = psn(j-1)
	139	IF ( psb(j) == 9999999.9 ) psb(j) = psb(j-1)
	140	IF ( pst(j) == 9999999.9 ) pst(j) = pst(j-1)
	141	IF ( pdx(j) == 9999999.9 .OR. pdx(j) == 0.0 ) pdx(j) = pdx(j-1)
	142	IF ( pdy(j) == 9999999.9 .OR. pdy(j) == 0.0 ) pdy(j) = pdy(j-1)
	143	IF ( pdz(j) == 9999999.9 .OR. pdz(j) == 0.0 ) pdz(j) = pdz(j-1)
	144	ENDDO
	145
	146	!
	147	!-- For the first model run of a possible job chain initialize the
	148	!-- particles, otherwise read the particle data from file.
	149	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
	150	.AND. read_particles_from_restartfile ) THEN
	151
	152	!
	153	!-- Read particle data from previous model run.
	154	!-- First open the input unit.
	155	IF ( myid_char == '' ) THEN
	156	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN'//myid_char, &
	157	FORM='UNFORMATTED' )
	158	ELSE
	159	OPEN ( 90, FILE='PARTICLE_RESTART_DATA_IN/'//myid_char, &
	160	FORM='UNFORMATTED' )
	161	ENDIF
	162
	163	!
	164	!-- First compare the version numbers
	165	READ ( 90 ) version_on_file
	166	particle_binary_version = '3.0'
	167	IF ( TRIM( version_on_file ) /= TRIM( particle_binary_version ) ) THEN
[274]	168	message_string = 'version mismatch concerning data from prior ' // &
	169	'run &version on file = "' // &
	170	TRIM( version_on_file ) // &
	171	'&version in program = "' // &
	172	TRIM( particle_binary_version ) // '"'
[254]	173	CALL message( 'init_particles', 'PA0214', 1, 2, 0, 6, 0 )
[1]	174	ENDIF
	175
	176	!
	177	!-- Read some particle parameters and the size of the particle arrays,
	178	!-- allocate them and read their contents.
	179	READ ( 90 ) bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
	180	maximum_number_of_particles, maximum_number_of_tailpoints, &
	181	maximum_number_of_tails, number_of_initial_particles, &
	182	number_of_particles, number_of_particle_groups, &
	183	number_of_tails, particle_groups, time_prel, &
	184	time_write_particle_data, uniform_particles
	185
	186	IF ( number_of_initial_particles /= 0 ) THEN
	187	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	188	READ ( 90 ) initial_particles
	189	ENDIF
	190
[667]	191	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	192	prt_start_index(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
[792]	193	particle_mask(maximum_number_of_particles), &
	194	part_1(maximum_number_of_particles), &
	195	part_2(maximum_number_of_particles) )
[1]	196
[792]	197	part_1 = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
	198	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
	199	0.0, 0, 0, 0, 0 )
	200
	201	part_2 = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
	202	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
	203	0.0, 0, 0, 0, 0 )
	204
	205	sort_count = 0
	206
	207	particles => part_1
	208
[1]	209	READ ( 90 ) prt_count, prt_start_index
	210	READ ( 90 ) particles
	211
	212	IF ( use_particle_tails ) THEN
	213	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
	214	maximum_number_of_tails), &
	215	new_tail_id(maximum_number_of_tails), &
	216	tail_mask(maximum_number_of_tails) )
	217	READ ( 90 ) particle_tail_coordinates
	218	ENDIF
	219
	220	CLOSE ( 90 )
	221
	222	ELSE
	223
	224	!
	225	!-- Allocate particle arrays and set attributes of the initial set of
	226	!-- particles, which can be also periodically released at later times.
	227	!-- Also allocate array for particle tail coordinates, if needed.
[667]	228	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	229	prt_start_index(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
[792]	230	particle_mask(maximum_number_of_particles), &
	231	part_1(maximum_number_of_particles), &
	232	part_2(maximum_number_of_particles) )
[1]	233
[792]	234	particles => part_1
	235
	236	sort_count = 0
	237
[1]	238	!
	239	!-- Initialize all particles with dummy values (otherwise errors may
	240	!-- occur within restart runs). The reason for this is still not clear
	241	!-- and may be presumably caused by errors in the respective user-interface.
	242	particles = particle_type( 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
	243	0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, &
[57]	244	0.0, 0, 0, 0, 0 )
[1]	245	particle_groups = particle_groups_type( 0.0, 0.0, 0.0, 0.0 )
	246
	247	!
	248	!-- Set the default particle size used for dvrp plots
	249	IF ( dvrp_psize == 9999999.9 ) dvrp_psize = 0.2 * dx
	250
	251	!
	252	!-- Set values for the density ratio and radius for all particle
	253	!-- groups, if necessary
	254	IF ( density_ratio(1) == 9999999.9 ) density_ratio(1) = 0.0
	255	IF ( radius(1) == 9999999.9 ) radius(1) = 0.0
	256	DO i = 2, number_of_particle_groups
	257	IF ( density_ratio(i) == 9999999.9 ) THEN
	258	density_ratio(i) = density_ratio(i-1)
	259	ENDIF
	260	IF ( radius(i) == 9999999.9 ) radius(i) = radius(i-1)
	261	ENDDO
	262
	263	DO i = 1, number_of_particle_groups
	264	IF ( density_ratio(i) /= 0.0 .AND. radius(i) == 0 ) THEN
[254]	265	WRITE( message_string, * ) 'particle group #', i, 'has a', &
	266	'density ratio /= 0 but radius = 0'
	267	CALL message( 'init_particles', 'PA0215', 1, 2, 0, 6, 0 )
[1]	268	ENDIF
	269	particle_groups(i)%density_ratio = density_ratio(i)
	270	particle_groups(i)%radius = radius(i)
	271	ENDDO
	272
	273	!
	274	!-- Calculate particle positions and store particle attributes, if
	275	!-- particle is situated on this PE
	276	n = 0
	277
	278	DO i = 1, number_of_particle_groups
	279
	280	pos_z = psb(i)
	281
	282	DO WHILE ( pos_z <= pst(i) )
	283
	284	pos_y = pss(i)
	285
	286	DO WHILE ( pos_y <= psn(i) )
	287
	288	IF ( pos_y >= ( nys - 0.5 ) * dy .AND. &
	289	pos_y < ( nyn + 0.5 ) * dy ) THEN
	290
	291	pos_x = psl(i)
	292
	293	DO WHILE ( pos_x <= psr(i) )
	294
	295	IF ( pos_x >= ( nxl - 0.5 ) * dx .AND. &
	296	pos_x < ( nxr + 0.5 ) * dx ) THEN
	297
	298	DO j = 1, particles_per_point
	299
	300	n = n + 1
	301	IF ( n > maximum_number_of_particles ) THEN
[254]	302	WRITE( message_string, * ) 'number of initial', &
[274]	303	'particles (', n, ') exceeds', &
	304	'&maximum_number_of_particles (', &
	305	maximum_number_of_particles, ') on PE ', &
[254]	306	myid
[274]	307	CALL message( 'init_particles', 'PA0216', &
[277]	308	2, 2, -1, 6, 1 )
[1]	309	ENDIF
	310	particles(n)%x = pos_x
	311	particles(n)%y = pos_y
	312	particles(n)%z = pos_z
	313	particles(n)%age = 0.0
[57]	314	particles(n)%age_m = 0.0
[1]	315	particles(n)%dt_sum = 0.0
	316	particles(n)%dvrp_psize = dvrp_psize
	317	particles(n)%e_m = 0.0
	318	particles(n)%speed_x = 0.0
	319	particles(n)%speed_x_sgs = 0.0
	320	particles(n)%speed_y = 0.0
	321	particles(n)%speed_y_sgs = 0.0
	322	particles(n)%speed_z = 0.0
	323	particles(n)%speed_z_sgs = 0.0
	324	particles(n)%origin_x = pos_x
	325	particles(n)%origin_y = pos_y
	326	particles(n)%origin_z = pos_z
	327	particles(n)%radius = particle_groups(i)%radius
	328	particles(n)%weight_factor =initial_weighting_factor
	329	particles(n)%color = 1
	330	particles(n)%group = i
	331	particles(n)%tailpoints = 0
	332	IF ( use_particle_tails .AND. &
	333	MOD( n, skip_particles_for_tail ) == 0 ) THEN
	334	number_of_tails = number_of_tails + 1
	335	!
	336	!-- This is a temporary provisional setting (see
	337	!-- further below!)
	338	particles(n)%tail_id = number_of_tails
	339	ELSE
	340	particles(n)%tail_id = 0
	341	ENDIF
	342
	343	ENDDO
	344
	345	ENDIF
	346
	347	pos_x = pos_x + pdx(i)
	348
	349	ENDDO
	350
	351	ENDIF
	352
	353	pos_y = pos_y + pdy(i)
	354
	355	ENDDO
	356
	357	pos_z = pos_z + pdz(i)
	358
	359	ENDDO
	360
	361	ENDDO
	362
	363	number_of_initial_particles = n
	364	number_of_particles = n
	365
	366	!
	367	!-- Calculate the number of particles and tails of the total domain
	368	#if defined( __parallel )
[622]	369	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[1]	370	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
[16]	371	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[622]	372	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[1]	373	CALL MPI_ALLREDUCE( number_of_tails, total_number_of_tails, 1, &
[16]	374	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	375	#else
	376	total_number_of_particles = number_of_particles
	377	total_number_of_tails = number_of_tails
	378	#endif
	379
	380	!
	381	!-- Set a seed value for the random number generator to be exclusively
	382	!-- used for the particle code. The generated random numbers should be
	383	!-- different on the different PEs.
	384	iran_part = iran_part + myid
	385
	386	!
	387	!-- User modification of initial particles
	388	CALL user_init_particles
	389
	390	!
	391	!-- Store the initial set of particles for release at later times
	392	IF ( number_of_initial_particles /= 0 ) THEN
	393	ALLOCATE( initial_particles(1:number_of_initial_particles) )
	394	initial_particles(1:number_of_initial_particles) = &
	395	particles(1:number_of_initial_particles)
	396	ENDIF
	397
	398	!
	399	!-- Add random fluctuation to particle positions
	400	IF ( random_start_position ) THEN
	401
	402	DO n = 1, number_of_initial_particles
	403	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
	404	particles(n)%x = particles(n)%x + &
[106]	405	( random_function( iran_part ) - 0.5 ) * &
[1]	406	pdx(particles(n)%group)
	407	IF ( particles(n)%x <= ( nxl - 0.5 ) * dx ) THEN
	408	particles(n)%x = ( nxl - 0.4999999999 ) * dx
	409	ELSEIF ( particles(n)%x >= ( nxr + 0.5 ) * dx ) THEN
	410	particles(n)%x = ( nxr + 0.4999999999 ) * dx
	411	ENDIF
	412	ENDIF
	413	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
	414	particles(n)%y = particles(n)%y + &
[106]	415	( random_function( iran_part ) - 0.5 ) * &
[1]	416	pdy(particles(n)%group)
	417	IF ( particles(n)%y <= ( nys - 0.5 ) * dy ) THEN
	418	particles(n)%y = ( nys - 0.4999999999 ) * dy
	419	ELSEIF ( particles(n)%y >= ( nyn + 0.5 ) * dy ) THEN
	420	particles(n)%y = ( nyn + 0.4999999999 ) * dy
	421	ENDIF
	422	ENDIF
	423	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
	424	particles(n)%z = particles(n)%z + &
[106]	425	( random_function( iran_part ) - 0.5 ) * &
[1]	426	pdz(particles(n)%group)
	427	ENDIF
	428	ENDDO
	429	ENDIF
	430
	431	!
[117]	432	!-- Sort particles in the sequence the gridboxes are stored in the memory.
	433	!-- Only required if cloud droplets are used.
	434	IF ( cloud_droplets ) CALL sort_particles
[1]	435
	436	!
	437	!-- Open file for statistical informations about particle conditions
	438	IF ( write_particle_statistics ) THEN
	439	CALL check_open( 80 )
	440	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
	441	number_of_initial_particles, &
	442	maximum_number_of_particles
	443	CALL close_file( 80 )
	444	ENDIF
	445
	446	!
	447	!-- Check if particles are really uniform in color and radius (dvrp_size)
	448	!-- (uniform_particles is preset TRUE)
	449	IF ( uniform_particles ) THEN
	450	IF ( number_of_initial_particles == 0 ) THEN
	451	uniform_particles_l = .TRUE.
	452	ELSE
	453	n = number_of_initial_particles
	454	IF ( MINVAL( particles(1:n)%dvrp_psize ) == &
	455	MAXVAL( particles(1:n)%dvrp_psize ) .AND. &
	456	MINVAL( particles(1:n)%color ) == &
	457	MAXVAL( particles(1:n)%color ) ) THEN
	458	uniform_particles_l = .TRUE.
	459	ELSE
	460	uniform_particles_l = .FALSE.
	461	ENDIF
	462	ENDIF
	463
	464	#if defined( __parallel )
[622]	465	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[1]	466	CALL MPI_ALLREDUCE( uniform_particles_l, uniform_particles, 1, &
	467	MPI_LOGICAL, MPI_LAND, comm2d, ierr )
	468	#else
	469	uniform_particles = uniform_particles_l
	470	#endif
	471
	472	ENDIF
	473
	474	!
[336]	475	!-- Particles will probably become none-uniform, if their size and color
	476	!-- will be determined by flow variables
	477	IF ( particle_color /= 'none' .OR. particle_dvrpsize /= 'none' ) THEN
	478	uniform_particles = .FALSE.
	479	ENDIF
	480
	481	!
[1]	482	!-- Set the beginning of the particle tails and their age
	483	IF ( use_particle_tails ) THEN
	484	!
[276]	485	!-- Choose the maximum number of tails with respect to the maximum number
	486	!-- of particles and skip_particles_for_tail
	487	maximum_number_of_tails = maximum_number_of_particles / &
	488	skip_particles_for_tail
	489
[229]	490	!
	491	!-- Create a minimum number of tails in case that there is no tail
	492	!-- initially (otherwise, index errors will occur when adressing the
	493	!-- arrays below)
	494	IF ( maximum_number_of_tails == 0 ) maximum_number_of_tails = 10
[1]	495
	496	ALLOCATE( particle_tail_coordinates(maximum_number_of_tailpoints,5, &
	497	maximum_number_of_tails), &
	498	new_tail_id(maximum_number_of_tails), &
	499	tail_mask(maximum_number_of_tails) )
	500
	501	particle_tail_coordinates = 0.0
	502	minimum_tailpoint_distance = minimum_tailpoint_distance**2
	503	number_of_initial_tails = number_of_tails
	504
	505	nn = 0
	506	DO n = 1, number_of_particles
	507	!
	508	!-- Only for those particles marked above with a provisional tail_id
	509	!-- tails will be created. Particles now get their final tail_id.
	510	IF ( particles(n)%tail_id /= 0 ) THEN
	511
	512	nn = nn + 1
	513	particles(n)%tail_id = nn
	514
	515	particle_tail_coordinates(1,1,nn) = particles(n)%x
	516	particle_tail_coordinates(1,2,nn) = particles(n)%y
	517	particle_tail_coordinates(1,3,nn) = particles(n)%z
	518	particle_tail_coordinates(1,4,nn) = particles(n)%color
	519	particles(n)%tailpoints = 1
	520	IF ( minimum_tailpoint_distance /= 0.0 ) THEN
	521	particle_tail_coordinates(2,1,nn) = particles(n)%x
	522	particle_tail_coordinates(2,2,nn) = particles(n)%y
	523	particle_tail_coordinates(2,3,nn) = particles(n)%z
	524	particle_tail_coordinates(2,4,nn) = particles(n)%color
	525	particle_tail_coordinates(1:2,5,nn) = 0.0
	526	particles(n)%tailpoints = 2
	527	ENDIF
	528
	529	ENDIF
	530	ENDDO
	531	ENDIF
	532
	533	!
	534	!-- Plot initial positions of particles (only if particle advection is
	535	!-- switched on from the beginning of the simulation (t=0))
	536	IF ( particle_advection_start == 0.0 ) CALL data_output_dvrp
	537
	538	ENDIF
	539
	540	!
	541	!-- Check boundary condition and set internal variables
	542	SELECT CASE ( bc_par_b )
	543
	544	CASE ( 'absorb' )
	545	ibc_par_b = 1
	546
	547	CASE ( 'reflect' )
	548	ibc_par_b = 2
	549
	550	CASE DEFAULT
[254]	551	WRITE( message_string, * ) 'unknown boundary condition ', &
	552	'bc_par_b = "', TRIM( bc_par_b ), '"'
	553	CALL message( 'init_particles', 'PA0217', 1, 2, 0, 6, 0 )
[1]	554
	555	END SELECT
	556	SELECT CASE ( bc_par_t )
	557
	558	CASE ( 'absorb' )
	559	ibc_par_t = 1
	560
	561	CASE ( 'reflect' )
	562	ibc_par_t = 2
	563
	564	CASE DEFAULT
[254]	565	WRITE( message_string, * ) 'unknown boundary condition ', &
	566	'bc_par_t = "', TRIM( bc_par_t ), '"'
	567	CALL message( 'init_particles', 'PA0218', 1, 2, 0, 6, 0 )
[1]	568
	569	END SELECT
	570	SELECT CASE ( bc_par_lr )
	571
	572	CASE ( 'cyclic' )
	573	ibc_par_lr = 0
	574
	575	CASE ( 'absorb' )
	576	ibc_par_lr = 1
	577
	578	CASE ( 'reflect' )
	579	ibc_par_lr = 2
	580
	581	CASE DEFAULT
[254]	582	WRITE( message_string, * ) 'unknown boundary condition ', &
	583	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
	584	CALL message( 'init_particles', 'PA0219', 1, 2, 0, 6, 0 )
[1]	585
	586	END SELECT
	587	SELECT CASE ( bc_par_ns )
	588
	589	CASE ( 'cyclic' )
	590	ibc_par_ns = 0
	591
	592	CASE ( 'absorb' )
	593	ibc_par_ns = 1
	594
	595	CASE ( 'reflect' )
	596	ibc_par_ns = 2
	597
	598	CASE DEFAULT
[254]	599	WRITE( message_string, * ) 'unknown boundary condition ', &
	600	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
	601	CALL message( 'init_particles', 'PA0220', 1, 2, 0, 6, 0 )
[1]	602
	603	END SELECT
	604	!
	605	!-- Formats
	606	8000 FORMAT (I6,1X,F7.2,4X,I6,71X,I6)
	607
	608	END SUBROUTINE init_particles

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