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source: palm/trunk/SOURCE/lpm_init.f90 @ 1835

Last change on this file since 1835 was 1832, checked in by hoffmann, 9 years ago
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[1682]	1	!> @file lpm_init.f90
[1036]	2	!--------------------------------------------------------------------------------!
	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1818]	16	! Copyright 1997-2016 Leibniz Universitaet Hannover
[1036]	17	!--------------------------------------------------------------------------------!
	18	!
[254]	19	! Current revisions:
[1]	20	! -----------------
[1784]	21	!
[1832]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: lpm_init.f90 1832 2016-04-07 13:28:15Z raasch $
	26	!
[1832]	27	! 1831 2016-04-07 13:15:51Z hoffmann
	28	! curvature_solution_effects moved to particle_attributes
	29	!
[1823]	30	! 1822 2016-04-07 07:49:42Z hoffmann
	31	! Unused variables removed.
	32	!
[1784]	33	! 1783 2016-03-06 18:36:17Z raasch
	34	! netcdf module added
	35	!
[1726]	36	! 1725 2015-11-17 13:01:51Z hoffmann
	37	! Bugfix: Processor-dependent seed for random function is generated before it is
	38	! used.
	39	!
[1692]	40	! 1691 2015-10-26 16:17:44Z maronga
	41	! Renamed prandtl_layer to constant_flux_layer.
	42	!
[1686]	43	! 1685 2015-10-08 07:32:13Z raasch
	44	! bugfix concerning vertical index offset in case of ocean
	45	!
[1683]	46	! 1682 2015-10-07 23:56:08Z knoop
	47	! Code annotations made doxygen readable
	48	!
[1576]	49	! 1575 2015-03-27 09:56:27Z raasch
	50	! initial vertical particle position is allowed to follow the topography
	51	!
[1360]	52	! 1359 2014-04-11 17:15:14Z hoffmann
	53	! New particle structure integrated.
	54	! Kind definition added to all floating point numbers.
	55	! lpm_init changed form a subroutine to a module.
	56	!
[1329]	57	! 1327 2014-03-21 11:00:16Z raasch
	58	! -netcdf_output
	59	!
[1323]	60	! 1322 2014-03-20 16:38:49Z raasch
	61	! REAL functions provided with KIND-attribute
	62	!
[1321]	63	! 1320 2014-03-20 08:40:49Z raasch
[1320]	64	! ONLY-attribute added to USE-statements,
	65	! kind-parameters added to all INTEGER and REAL declaration statements,
	66	! kinds are defined in new module kinds,
	67	! revision history before 2012 removed,
	68	! comment fields (!:) to be used for variable explanations added to
	69	! all variable declaration statements
	70	! bugfix: #if defined( __parallel ) added
[850]	71	!
[1315]	72	! 1314 2014-03-14 18:25:17Z suehring
	73	! Vertical logarithmic interpolation of horizontal particle speed for particles
	74	! between roughness height and first vertical grid level.
	75	!
[1093]	76	! 1092 2013-02-02 11:24:22Z raasch
	77	! unused variables removed
	78	!
[1037]	79	! 1036 2012-10-22 13:43:42Z raasch
	80	! code put under GPL (PALM 3.9)
	81	!
[850]	82	! 849 2012-03-15 10:35:09Z raasch
[849]	83	! routine renamed: init_particles -> lpm_init
	84	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
	85	! advec_particles),
	86	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
[392]	87	!
[829]	88	! 828 2012-02-21 12:00:36Z raasch
	89	! call of init_kernels, particle feature color renamed class
	90	!
[826]	91	! 824 2012-02-17 09:09:57Z raasch
	92	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
	93	! array particles implemented as pointer
	94	!
[668]	95	! 667 2010-12-23 12:06:00Z suehring/gryschka
	96	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
	97	! of arrays.
	98	!
[1]	99	! Revision 1.1 1999/11/25 16:22:38 raasch
	100	! Initial revision
	101	!
	102	!
	103	! Description:
	104	! ------------
[1682]	105	!> This routine initializes a set of particles and their attributes (position,
	106	!> radius, ..) which are used by the Lagrangian particle model (see lpm).
[1]	107	!------------------------------------------------------------------------------!
[1682]	108	MODULE lpm_init_mod
	109
[1]	110
[1320]	111	USE arrays_3d, &
	112	ONLY: de_dx, de_dy, de_dz, zu, zw, z0
	113
	114	USE control_parameters, &
[1691]	115	ONLY: cloud_droplets, constant_flux_layer, current_timestep_number, &
[1783]	116	dz, initializing_actions, message_string, ocean, simulated_time
[1320]	117
	118	USE grid_variables, &
[1359]	119	ONLY: ddx, dx, ddy, dy
[1320]	120
	121	USE indices, &
[1575]	122	ONLY: nx, nxl, nxlg, nxrg, nxr, ny, nyn, nys, nyng, nysg, nz, nzb, &
	123	nzb_w_inner, nzt
[1320]	124
	125	USE kinds
	126
	127	USE lpm_collision_kernels_mod, &
	128	ONLY: init_kernels
	129
[1783]	130	USE netcdf_interface, &
	131	ONLY: netcdf_data_format
	132
[1320]	133	USE particle_attributes, &
[1359]	134	ONLY: alloc_factor, bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
	135	block_offset, block_offset_def, collision_kernel, &
[1831]	136	curvature_solution_effects, &
[1822]	137	density_ratio, grid_particles, &
[1359]	138	initial_weighting_factor, ibc_par_b, ibc_par_lr, ibc_par_ns, &
	139	ibc_par_t, iran_part, log_z_z0, &
	140	max_number_of_particle_groups, maximum_number_of_particles, &
[1822]	141	min_nr_particle, mpi_particle_type, &
	142	number_of_particles, &
[1320]	143	number_of_particle_groups, number_of_sublayers, &
[1822]	144	offset_ocean_nzt, offset_ocean_nzt_m1, &
[1359]	145	particles, particle_advection_start, particle_groups, &
	146	particle_groups_type, particles_per_point, &
[1822]	147	particle_type, pdx, pdy, pdz, &
[1359]	148	prt_count, psb, psl, psn, psr, pss, pst, &
[1320]	149	radius, random_start_position, read_particles_from_restartfile,&
[1822]	150	seed_follows_topography, sort_count, &
	151	total_number_of_particles, &
	152	use_sgs_for_particles, &
[1359]	153	write_particle_statistics, uniform_particles, zero_particle, &
	154	z0_av_global
[1320]	155
[1]	156	USE pegrid
	157
[1320]	158	USE random_function_mod, &
	159	ONLY: random_function
[1]	160
[1359]	161	IMPLICIT NONE
[1320]	162
[1359]	163	PRIVATE
	164
[1682]	165	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !<
	166	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !<
[1359]	167
	168	INTERFACE lpm_init
	169	MODULE PROCEDURE lpm_init
	170	END INTERFACE lpm_init
	171
	172	INTERFACE lpm_create_particle
	173	MODULE PROCEDURE lpm_create_particle
	174	END INTERFACE lpm_create_particle
	175
	176	PUBLIC lpm_init, lpm_create_particle
	177
	178	CONTAINS
	179
[1682]	180	!------------------------------------------------------------------------------!
	181	! Description:
	182	! ------------
	183	!> @todo Missing subroutine description.
	184	!------------------------------------------------------------------------------!
[1359]	185	SUBROUTINE lpm_init
	186
	187	USE lpm_collision_kernels_mod, &
	188	ONLY: init_kernels
	189
[1]	190	IMPLICIT NONE
	191
[1682]	192	INTEGER(iwp) :: i !<
	193	INTEGER(iwp) :: j !<
	194	INTEGER(iwp) :: k !<
[1320]	195
[1]	196	#if defined( __parallel )
[1682]	197	INTEGER(iwp), DIMENSION(3) :: blocklengths !<
	198	INTEGER(iwp), DIMENSION(3) :: displacements !<
	199	INTEGER(iwp), DIMENSION(3) :: types !<
[1]	200	#endif
	201
[1682]	202	REAL(wp) :: height_int !<
	203	REAL(wp) :: height_p !<
	204	REAL(wp) :: z_p !<
	205	REAL(wp) :: z0_av_local !<
[1]	206
	207	#if defined( __parallel )
	208	!
	209	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
[82]	210	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
[1359]	211	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
	212	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
	213
[1]	214	types(1) = MPI_REAL
	215	types(2) = MPI_INTEGER
	216	types(3) = MPI_UB
	217	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
	218	mpi_particle_type, ierr )
	219	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
	220	#endif
	221
	222	!
[150]	223	!-- In case of oceans runs, the vertical index calculations need an offset,
	224	!-- because otherwise the k indices will become negative
	225	IF ( ocean ) THEN
	226	offset_ocean_nzt = nzt
	227	offset_ocean_nzt_m1 = nzt - 1
	228	ENDIF
	229
[1359]	230	!
	231	!-- Define block offsets for dividing a gridcell in 8 sub cells
[150]	232
[1359]	233	block_offset(0) = block_offset_def (-1,-1,-1)
	234	block_offset(1) = block_offset_def (-1,-1, 0)
	235	block_offset(2) = block_offset_def (-1, 0,-1)
	236	block_offset(3) = block_offset_def (-1, 0, 0)
	237	block_offset(4) = block_offset_def ( 0,-1,-1)
	238	block_offset(5) = block_offset_def ( 0,-1, 0)
	239	block_offset(6) = block_offset_def ( 0, 0,-1)
	240	block_offset(7) = block_offset_def ( 0, 0, 0)
[150]	241	!
[1]	242	!-- Check the number of particle groups.
	243	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
[274]	244	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
	245	max_number_of_particle_groups , &
[254]	246	'&number_of_particle_groups reset to ', &
	247	max_number_of_particle_groups
[849]	248	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
[1]	249	number_of_particle_groups = max_number_of_particle_groups
	250	ENDIF
	251
	252	!
	253	!-- Set default start positions, if necessary
[1359]	254	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
	255	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
	256	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
	257	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
	258	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
	259	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
[1]	260
[1359]	261	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
	262	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
	263	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
[1]	264
	265	DO j = 2, number_of_particle_groups
[1359]	266	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
	267	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
	268	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
	269	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
	270	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
	271	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
	272	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
	273	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
	274	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
[1]	275	ENDDO
	276
	277	!
[849]	278	!-- Allocate arrays required for calculating particle SGS velocities
[1822]	279	IF ( use_sgs_for_particles .AND. .NOT. cloud_droplets ) THEN
[849]	280	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	281	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	282	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	283	ENDIF
	284
	285	!
[1314]	286	!-- Allocate array required for logarithmic vertical interpolation of
	287	!-- horizontal particle velocities between the surface and the first vertical
	288	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
	289	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
	290	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
	291	!-- To obtain exact height levels of particles, linear interpolation is applied
	292	!-- (see lpm_advec.f90).
[1691]	293	IF ( constant_flux_layer ) THEN
[1314]	294
	295	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
	296	z_p = zu(nzb+1) - zw(nzb)
	297
	298	!
	299	!-- Calculate horizontal mean value of z0 used for logartihmic
	300	!-- interpolation. Note: this is not exact for heterogeneous z0.
	301	!-- However, sensitivity studies showed that the effect is
	302	!-- negligible.
	303	z0_av_local = SUM( z0(nys:nyn,nxl:nxr) )
[1359]	304	z0_av_global = 0.0_wp
[1314]	305
[1320]	306	#if defined( __parallel )
[1314]	307	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
	308	comm2d, ierr )
[1320]	309	#else
	310	z0_av_global = z0_av_local
	311	#endif
[1314]	312
	313	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
	314	!
	315	!-- Horizontal wind speed is zero below and at z0
[1359]	316	log_z_z0(0) = 0.0_wp
[1314]	317	!
	318	!-- Calculate vertical depth of the sublayers
[1322]	319	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
[1314]	320	!
	321	!-- Precalculate LOG(z/z0)
[1359]	322	height_p = 0.0_wp
[1314]	323	DO k = 1, number_of_sublayers
	324
	325	height_p = height_p + height_int
	326	log_z_z0(k) = LOG( height_p / z0_av_global )
	327
	328	ENDDO
	329
	330
	331	ENDIF
	332
	333	!
[1359]	334	!-- Check boundary condition and set internal variables
	335	SELECT CASE ( bc_par_b )
	336
	337	CASE ( 'absorb' )
	338	ibc_par_b = 1
	339
	340	CASE ( 'reflect' )
	341	ibc_par_b = 2
	342
	343	CASE DEFAULT
	344	WRITE( message_string, * ) 'unknown boundary condition ', &
	345	'bc_par_b = "', TRIM( bc_par_b ), '"'
	346	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
	347
	348	END SELECT
	349	SELECT CASE ( bc_par_t )
	350
	351	CASE ( 'absorb' )
	352	ibc_par_t = 1
	353
	354	CASE ( 'reflect' )
	355	ibc_par_t = 2
	356
	357	CASE DEFAULT
	358	WRITE( message_string, * ) 'unknown boundary condition ', &
	359	'bc_par_t = "', TRIM( bc_par_t ), '"'
	360	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
	361
	362	END SELECT
	363	SELECT CASE ( bc_par_lr )
	364
	365	CASE ( 'cyclic' )
	366	ibc_par_lr = 0
	367
	368	CASE ( 'absorb' )
	369	ibc_par_lr = 1
	370
	371	CASE ( 'reflect' )
	372	ibc_par_lr = 2
	373
	374	CASE DEFAULT
	375	WRITE( message_string, * ) 'unknown boundary condition ', &
	376	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
	377	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
	378
	379	END SELECT
	380	SELECT CASE ( bc_par_ns )
	381
	382	CASE ( 'cyclic' )
	383	ibc_par_ns = 0
	384
	385	CASE ( 'absorb' )
	386	ibc_par_ns = 1
	387
	388	CASE ( 'reflect' )
	389	ibc_par_ns = 2
	390
	391	CASE DEFAULT
	392	WRITE( message_string, * ) 'unknown boundary condition ', &
	393	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
	394	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
	395
	396	END SELECT
	397
	398	!
[828]	399	!-- Initialize collision kernels
	400	IF ( collision_kernel /= 'none' ) CALL init_kernels
	401
	402	!
[1]	403	!-- For the first model run of a possible job chain initialize the
[849]	404	!-- particles, otherwise read the particle data from restart file.
[1]	405	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
	406	.AND. read_particles_from_restartfile ) THEN
	407
[849]	408	CALL lpm_read_restart_file
[1]	409
	410	ELSE
	411
	412	!
	413	!-- Allocate particle arrays and set attributes of the initial set of
	414	!-- particles, which can be also periodically released at later times.
[1359]	415	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	416	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
[1]	417
[1359]	418	maximum_number_of_particles = 0
	419	number_of_particles = 0
[792]	420
	421	sort_count = 0
[1359]	422	prt_count = 0
[792]	423
[1]	424	!
	425	!-- Initialize all particles with dummy values (otherwise errors may
	426	!-- occur within restart runs). The reason for this is still not clear
	427	!-- and may be presumably caused by errors in the respective user-interface.
[1359]	428	zero_particle = particle_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
	429	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
	430	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
	431	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0, 0, 0, &
	432	0, .FALSE., -1)
[1822]	433
[1359]	434	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
[1]	435
	436	!
	437	!-- Set values for the density ratio and radius for all particle
	438	!-- groups, if necessary
[1359]	439	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
	440	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
[1]	441	DO i = 2, number_of_particle_groups
[1359]	442	IF ( density_ratio(i) == 9999999.9_wp ) THEN
[1]	443	density_ratio(i) = density_ratio(i-1)
	444	ENDIF
[1359]	445	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
[1]	446	ENDDO
	447
	448	DO i = 1, number_of_particle_groups
[1359]	449	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
[254]	450	WRITE( message_string, * ) 'particle group #', i, 'has a', &
	451	'density ratio /= 0 but radius = 0'
[849]	452	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
[1]	453	ENDIF
	454	particle_groups(i)%density_ratio = density_ratio(i)
	455	particle_groups(i)%radius = radius(i)
	456	ENDDO
	457
	458	!
[1359]	459	!-- Set a seed value for the random number generator to be exclusively
	460	!-- used for the particle code. The generated random numbers should be
	461	!-- different on the different PEs.
	462	iran_part = iran_part + myid
	463
[1725]	464	CALL lpm_create_particle (PHASE_INIT)
	465
[1359]	466	!
	467	!-- User modification of initial particles
	468	CALL user_lpm_init
	469
	470	!
	471	!-- Open file for statistical informations about particle conditions
	472	IF ( write_particle_statistics ) THEN
	473	CALL check_open( 80 )
	474	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
	475	number_of_particles, &
	476	maximum_number_of_particles
	477	CALL close_file( 80 )
	478	ENDIF
	479
	480	ENDIF
	481
	482	!
	483	!-- To avoid programm abort, assign particles array to the local version of
	484	!-- first grid cell
	485	number_of_particles = prt_count(nzb+1,nys,nxl)
	486	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
	487
	488	!
	489	!-- Formats
	490	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
	491
	492	END SUBROUTINE lpm_init
	493
[1682]	494	!------------------------------------------------------------------------------!
	495	! Description:
	496	! ------------
	497	!> @todo Missing subroutine description.
	498	!------------------------------------------------------------------------------!
[1359]	499	SUBROUTINE lpm_create_particle (phase)
	500
	501	USE lpm_exchange_horiz_mod, &
	502	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
	503
	504	USE lpm_pack_arrays_mod, &
	505	ONLY: lpm_pack_all_arrays
	506
	507	IMPLICIT NONE
	508
[1682]	509	INTEGER(iwp) :: alloc_size !<
	510	INTEGER(iwp) :: i !<
	511	INTEGER(iwp) :: ip !<
	512	INTEGER(iwp) :: j !<
	513	INTEGER(iwp) :: jp !<
	514	INTEGER(iwp) :: kp !<
	515	INTEGER(iwp) :: loop_stride !<
	516	INTEGER(iwp) :: n !<
	517	INTEGER(iwp) :: new_size !<
[1359]	518
[1682]	519	INTEGER(iwp), INTENT(IN) :: phase !<
[1359]	520
[1682]	521	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !<
	522	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !<
[1359]	523
[1682]	524	LOGICAL :: first_stride !<
[1359]	525
[1682]	526	REAL(wp) :: pos_x !<
	527	REAL(wp) :: pos_y !<
	528	REAL(wp) :: pos_z !<
[1359]	529
[1682]	530	TYPE(particle_type),TARGET :: tmp_particle !<
[1359]	531
	532	!
	533	!-- Calculate particle positions and store particle attributes, if
	534	!-- particle is situated on this PE
	535	DO loop_stride = 1, 2
	536	first_stride = (loop_stride == 1)
	537	IF ( first_stride ) THEN
	538	local_count = 0 ! count number of particles
	539	ELSE
	540	local_count = prt_count ! Start address of new particles
	541	ENDIF
	542
[1]	543	n = 0
	544	DO i = 1, number_of_particle_groups
	545
	546	pos_z = psb(i)
	547
	548	DO WHILE ( pos_z <= pst(i) )
	549
	550	pos_y = pss(i)
	551
	552	DO WHILE ( pos_y <= psn(i) )
	553
[1359]	554	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
	555	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
[1]	556
	557	pos_x = psl(i)
	558
[1575]	559	xloop: DO WHILE ( pos_x <= psr(i) )
[1]	560
[1359]	561	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
	562	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
[1]	563
	564	DO j = 1, particles_per_point
	565
	566	n = n + 1
[1359]	567	tmp_particle%x = pos_x
	568	tmp_particle%y = pos_y
	569	tmp_particle%z = pos_z
	570	tmp_particle%age = 0.0_wp
	571	tmp_particle%age_m = 0.0_wp
	572	tmp_particle%dt_sum = 0.0_wp
[1822]	573	tmp_particle%dvrp_psize = 0.0_wp !unused
[1359]	574	tmp_particle%e_m = 0.0_wp
[824]	575	IF ( curvature_solution_effects ) THEN
	576	!
	577	!-- Initial values (internal timesteps, derivative)
	578	!-- for Rosenbrock method
[1359]	579	tmp_particle%rvar1 = 1.0E-12_wp
	580	tmp_particle%rvar2 = 1.0E-3_wp
	581	tmp_particle%rvar3 = -9999999.9_wp
[824]	582	ELSE
	583	!
	584	!-- Initial values for SGS velocities
[1359]	585	tmp_particle%rvar1 = 0.0_wp
	586	tmp_particle%rvar2 = 0.0_wp
	587	tmp_particle%rvar3 = 0.0_wp
[824]	588	ENDIF
[1359]	589	tmp_particle%speed_x = 0.0_wp
	590	tmp_particle%speed_y = 0.0_wp
	591	tmp_particle%speed_z = 0.0_wp
	592	tmp_particle%origin_x = pos_x
	593	tmp_particle%origin_y = pos_y
	594	tmp_particle%origin_z = pos_z
	595	tmp_particle%radius = particle_groups(i)%radius
	596	tmp_particle%weight_factor = initial_weighting_factor
	597	tmp_particle%class = 1
	598	tmp_particle%group = i
[1822]	599	tmp_particle%tailpoints = 0 !unused
[1359]	600	tmp_particle%particle_mask = .TRUE.
[1822]	601	tmp_particle%tail_id = 0 !unused
	602
[1]	603	!
[1575]	604	!-- Determine the grid indices of the particle position
[1359]	605	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
	606	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
[1685]	607	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt
[1]	608
[1575]	609	IF ( seed_follows_topography ) THEN
	610	!
	611	!-- Particle height is given relative to topography
	612	kp = kp + nzb_w_inner(jp,ip)
	613	tmp_particle%z = tmp_particle%z + zw(kp)
	614	IF ( kp > nzt ) THEN
	615	pos_x = pos_x + pdx(i)
	616	CYCLE xloop
	617	ENDIF
	618	ENDIF
	619
[1359]	620	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
	621	IF ( .NOT. first_stride ) THEN
	622	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
	623	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
	624	ENDIF
	625	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
	626	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
	627	ENDIF
	628	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
	629	ENDIF
[1]	630	ENDDO
	631
	632	ENDIF
	633
	634	pos_x = pos_x + pdx(i)
	635
[1575]	636	ENDDO xloop
[1]	637
	638	ENDIF
	639
	640	pos_y = pos_y + pdy(i)
	641
	642	ENDDO
	643
	644	pos_z = pos_z + pdz(i)
	645
	646	ENDDO
	647
	648	ENDDO
	649
[1359]	650	IF ( first_stride ) THEN
	651	DO ip = nxl, nxr
	652	DO jp = nys, nyn
	653	DO kp = nzb+1, nzt
	654	IF ( phase == PHASE_INIT ) THEN
	655	IF ( local_count(kp,jp,ip) > 0 ) THEN
	656	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
	657	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
	658	min_nr_particle )
	659	ELSE
	660	alloc_size = min_nr_particle
	661	ENDIF
	662	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
	663	DO n = 1, alloc_size
	664	grid_particles(kp,jp,ip)%particles(n) = zero_particle
	665	ENDDO
	666	ELSEIF ( phase == PHASE_RELEASE ) THEN
	667	IF ( local_count(kp,jp,ip) > 0 ) THEN
	668	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
	669	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
	670	alloc_factor / 100.0_wp ) ), min_nr_particle )
	671	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
	672	CALL realloc_particles_array(ip,jp,kp,alloc_size)
	673	ENDIF
	674	ENDIF
	675	ENDIF
	676	ENDDO
	677	ENDDO
	678	ENDDO
	679	ENDIF
	680	ENDDO
[1]	681
[1359]	682	local_start = prt_count+1
	683	prt_count = local_count
[1]	684	!
[1359]	685	!-- Add random fluctuation to particle positions
	686	IF ( random_start_position ) THEN
	687	DO ip = nxl, nxr
	688	DO jp = nys, nyn
	689	DO kp = nzb+1, nzt
	690	number_of_particles = prt_count(kp,jp,ip)
	691	IF ( number_of_particles <= 0 ) CYCLE
	692	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
[1]	693
[1359]	694	DO n = local_start(kp,jp,ip), number_of_particles !Move only new particles
	695	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
	696	particles(n)%x = particles(n)%x + &
	697	( random_function( iran_part ) - 0.5_wp ) * &
	698	pdx(particles(n)%group)
	699	ENDIF
	700	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
	701	particles(n)%y = particles(n)%y + &
	702	( random_function( iran_part ) - 0.5_wp ) * &
	703	pdy(particles(n)%group)
	704	ENDIF
	705	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
	706	particles(n)%z = particles(n)%z + &
	707	( random_function( iran_part ) - 0.5_wp ) * &
	708	pdz(particles(n)%group)
	709	ENDIF
	710	ENDDO
[1]	711	!
[1359]	712	!-- Identify particles located outside the model domain
	713	CALL lpm_boundary_conds( 'bottom/top' )
	714	ENDDO
	715	ENDDO
	716	ENDDO
[1]	717	!
[1359]	718	!-- Exchange particles between grid cells and processors
	719	CALL lpm_move_particle
	720	CALL lpm_exchange_horiz
[1]	721
[1359]	722	ENDIF
[1]	723	!
[1359]	724	!-- In case of random_start_position, delete particles identified by
	725	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
	726	!-- which is needed for a fast interpolation of the LES fields on the particle
	727	!-- position.
	728	CALL lpm_pack_all_arrays
[1]	729
	730	!
[1359]	731	!-- Determine maximum number of particles (i.e., all possible particles that
	732	!-- have been allocated) and the current number of particles
	733	DO ip = nxl, nxr
	734	DO jp = nys, nyn
	735	DO kp = nzb+1, nzt
	736	maximum_number_of_particles = maximum_number_of_particles &
	737	+ SIZE(grid_particles(kp,jp,ip)%particles)
	738	number_of_particles = number_of_particles &
	739	+ prt_count(kp,jp,ip)
[1]	740	ENDDO
[1359]	741	ENDDO
	742	ENDDO
[1]	743	!
[1822]	744	!-- Calculate the number of particles of the total domain
[1]	745	#if defined( __parallel )
[1359]	746	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
	747	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
	748	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	749	#else
[1359]	750	total_number_of_particles = number_of_particles
[1]	751	#endif
	752
[1359]	753	RETURN
[1]	754
[1359]	755	END SUBROUTINE lpm_create_particle
[336]	756
[1359]	757	END MODULE lpm_init_mod

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