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source: palm/trunk/SOURCE/lpm_exchange_horiz.f90 @ 2327

Last change on this file since 2327 was 2305, checked in by hoffmann, 7 years ago
Improved calculation of particle IDs.
Property svn:keywords set to `Id`
File size: 48.8 KB

Rev	Line
[1873]	1	!> @file lpm_exchange_horiz.f90
[2000]	2	!------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
[2000]	5	! PALM is free software: you can redistribute it and/or modify it under the
	6	! terms of the GNU General Public License as published by the Free Software
	7	! Foundation, either version 3 of the License, or (at your option) any later
	8	! version.
[1036]	9	!
	10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	13	!
	14	! You should have received a copy of the GNU General Public License along with
	15	! PALM. If not, see <http://www.gnu.org/licenses/>.
	16	!
[2101]	17	! Copyright 1997-2017 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[849]	20	! Current revisions:
	21	! ------------------
[1930]	22	!
[2245]	23	!
[1930]	24	! Former revisions:
	25	! -----------------
	26	! $Id: lpm_exchange_horiz.f90 2305 2017-07-06 11:18:47Z maronga $
[2305]	27	! Improved calculation of particle IDs.
	28	!
	29	! 2245 2017-06-02 14:37:10Z schwenkel
[2245]	30	! Bugfix in Add_particles_to_gridcell:
	31	! Apply boundary conditions also in y-direction
	32	!
	33	! 2151 2017-02-15 10:42:16Z schwenkel
	34	! Bugfix in lpm_move_particle that prevents
	35	! false production of additional particles
[1930]	36	!
[2001]	37	! 2000 2016-08-20 18:09:15Z knoop
	38	! Forced header and separation lines into 80 columns
	39	!
[1937]	40	! 1936 2016-06-13 13:37:44Z suehring
	41	! Deallocation of unused memory
	42	!
[1930]	43	! 1929 2016-06-09 16:25:25Z suehring
[1929]	44	! Bugfixes:
	45	! - reallocation of new particles
	46	! ( did not work for small number of min_nr_particle )
	47	! - dynamical reallocation of north-south exchange arrays ( particles got lost )
	48	! - north-south exchange ( nr_move_north, nr_move_south were overwritten by zero )
	49	! - horizontal particle boundary conditions in serial mode
	50	!
	51	! Remove unused variables
	52	! Descriptions in variable declaration blocks added
[1321]	53	!
[1874]	54	! 1873 2016-04-18 14:50:06Z maronga
	55	! Module renamed (removed _mod)
	56	!
	57	!
[1851]	58	! 1850 2016-04-08 13:29:27Z maronga
	59	! Module renamed
	60	!
	61	!
[1823]	62	! 1822 2016-04-07 07:49:42Z hoffmann
	63	! Tails removed. Unused variables removed.
	64	!
[1784]	65	! 1783 2016-03-06 18:36:17Z raasch
	66	! new netcdf-module included
	67	!
[1692]	68	! 1691 2015-10-26 16:17:44Z maronga
	69	! Formatting corrections.
	70	!
[1686]	71	! 1685 2015-10-08 07:32:13Z raasch
	72	! bugfix concerning vertical index offset in case of ocean
	73	!
[1683]	74	! 1682 2015-10-07 23:56:08Z knoop
	75	! Code annotations made doxygen readable
	76	!
[1360]	77	! 1359 2014-04-11 17:15:14Z hoffmann
	78	! New particle structure integrated.
	79	! Kind definition added to all floating point numbers.
	80	!
[1329]	81	! 1327 2014-03-21 11:00:16Z raasch
	82	! -netcdf output queries
	83	!
[1321]	84	! 1320 2014-03-20 08:40:49Z raasch
[1320]	85	! ONLY-attribute added to USE-statements,
	86	! kind-parameters added to all INTEGER and REAL declaration statements,
	87	! kinds are defined in new module kinds,
	88	! comment fields (!:) to be used for variable explanations added to
	89	! all variable declaration statements
[849]	90	!
[1319]	91	! 1318 2014-03-17 13:35:16Z raasch
	92	! module interfaces removed
	93	!
[1037]	94	! 1036 2012-10-22 13:43:42Z raasch
	95	! code put under GPL (PALM 3.9)
	96	!
[852]	97	! 851 2012-03-15 14:32:58Z raasch
	98	! Bugfix: resetting of particle_mask and tail mask moved from end of this
	99	! routine to lpm
	100	!
[850]	101	! 849 2012-03-15 10:35:09Z raasch
	102	! initial revision (former part of advec_particles)
[849]	103	!
[850]	104	!
[849]	105	! Description:
	106	! ------------
[1822]	107	! Exchange of particles between the subdomains.
[849]	108	!------------------------------------------------------------------------------!
[1682]	109	MODULE lpm_exchange_horiz_mod
	110
[2305]	111	USE, INTRINSIC :: ISO_C_BINDING
[849]	112
[1320]	113	USE control_parameters, &
[1783]	114	ONLY: dz, message_string, simulated_time
[1320]	115
	116	USE cpulog, &
	117	ONLY: cpu_log, log_point_s
	118
	119	USE grid_variables, &
	120	ONLY: ddx, ddy, dx, dy
	121
	122	USE indices, &
[1359]	123	ONLY: nx, nxl, nxr, ny, nyn, nys, nzb, nzt
[1320]	124
	125	USE kinds
	126
[1359]	127	USE lpm_pack_arrays_mod, &
	128	ONLY: lpm_pack_arrays
	129
[1783]	130	USE netcdf_interface, &
	131	ONLY: netcdf_data_format
	132
[1320]	133	USE particle_attributes, &
[1822]	134	ONLY: alloc_factor, deleted_particles, grid_particles, &
	135	ibc_par_lr, ibc_par_ns, min_nr_particle, &
[2305]	136	number_of_particles, &
[1822]	137	offset_ocean_nzt, offset_ocean_nzt_m1, particles, &
	138	particle_type, prt_count, trlp_count_sum, &
[1359]	139	trlp_count_recv_sum, trnp_count_sum, trnp_count_recv_sum, &
	140	trrp_count_sum, trrp_count_recv_sum, trsp_count_sum, &
[1822]	141	trsp_count_recv_sum, zero_particle
[1320]	142
[849]	143	USE pegrid
	144
	145	IMPLICIT NONE
	146
[1682]	147	INTEGER(iwp), PARAMETER :: NR_2_direction_move = 10000 !<
	148	INTEGER(iwp) :: nr_move_north !<
	149	INTEGER(iwp) :: nr_move_south !<
[1359]	150
[1929]	151	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: move_also_north
	152	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: move_also_south
[1359]	153
	154	SAVE
	155
	156	PRIVATE
[1936]	157	PUBLIC lpm_exchange_horiz, lpm_move_particle, realloc_particles_array, &
	158	dealloc_particles_array
[1359]	159
	160	INTERFACE lpm_exchange_horiz
	161	MODULE PROCEDURE lpm_exchange_horiz
	162	END INTERFACE lpm_exchange_horiz
	163
	164	INTERFACE lpm_move_particle
	165	MODULE PROCEDURE lpm_move_particle
	166	END INTERFACE lpm_move_particle
	167
	168	INTERFACE realloc_particles_array
	169	MODULE PROCEDURE realloc_particles_array
	170	END INTERFACE realloc_particles_array
	171
[1936]	172	INTERFACE dealloc_particles_array
	173	MODULE PROCEDURE dealloc_particles_array
	174	END INTERFACE dealloc_particles_array
[1359]	175	CONTAINS
	176
[1682]	177	!------------------------------------------------------------------------------!
	178	! Description:
	179	! ------------
	180	!> Exchange between subdomains.
	181	!> As soon as one particle has moved beyond the boundary of the domain, it
	182	!> is included in the relevant transfer arrays and marked for subsequent
	183	!> deletion on this PE.
	184	!> First sweep for crossings in x direction. Find out first the number of
	185	!> particles to be transferred and allocate temporary arrays needed to store
	186	!> them.
	187	!> For a one-dimensional decomposition along y, no transfer is necessary,
	188	!> because the particle remains on the PE, but the particle coordinate has to
	189	!> be adjusted.
	190	!------------------------------------------------------------------------------!
[1359]	191	SUBROUTINE lpm_exchange_horiz
	192
	193	IMPLICIT NONE
	194
[1929]	195	INTEGER(iwp) :: i !< grid index (x) of particle positition
	196	INTEGER(iwp) :: ip !< index variable along x
	197	INTEGER(iwp) :: j !< grid index (y) of particle positition
	198	INTEGER(iwp) :: jp !< index variable along y
	199	INTEGER(iwp) :: kp !< index variable along z
	200	INTEGER(iwp) :: n !< particle index variable
[2305]	201	INTEGER(iwp) :: par_size !< Particle size in bytes
[1929]	202	INTEGER(iwp) :: trlp_count !< number of particles send to left PE
	203	INTEGER(iwp) :: trlp_count_recv !< number of particles receive from right PE
	204	INTEGER(iwp) :: trnp_count !< number of particles send to north PE
	205	INTEGER(iwp) :: trnp_count_recv !< number of particles receive from south PE
	206	INTEGER(iwp) :: trrp_count !< number of particles send to right PE
	207	INTEGER(iwp) :: trrp_count_recv !< number of particles receive from left PE
	208	INTEGER(iwp) :: trsp_count !< number of particles send to south PE
	209	INTEGER(iwp) :: trsp_count_recv !< number of particles receive from north PE
[849]	210
[1929]	211	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: rvlp !< particles received from right PE
	212	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: rvnp !< particles received from south PE
	213	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: rvrp !< particles received from left PE
	214	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: rvsp !< particles received from north PE
	215	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: trlp !< particles send to left PE
	216	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: trnp !< particles send to north PE
	217	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: trrp !< particles send to right PE
	218	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: trsp !< particles send to south PE
[849]	219
[1359]	220	CALL cpu_log( log_point_s(23), 'lpm_exchange_horiz', 'start' )
	221
[849]	222	#if defined( __parallel )
	223
[1822]	224	!
	225	!-- Exchange between subdomains.
	226	!-- As soon as one particle has moved beyond the boundary of the domain, it
	227	!-- is included in the relevant transfer arrays and marked for subsequent
	228	!-- deletion on this PE.
	229	!-- First sweep for crossings in x direction. Find out first the number of
	230	!-- particles to be transferred and allocate temporary arrays needed to store
	231	!-- them.
	232	!-- For a one-dimensional decomposition along y, no transfer is necessary,
	233	!-- because the particle remains on the PE, but the particle coordinate has to
	234	!-- be adjusted.
[849]	235	trlp_count = 0
	236	trrp_count = 0
	237
	238	trlp_count_recv = 0
	239	trrp_count_recv = 0
	240
	241	IF ( pdims(1) /= 1 ) THEN
	242	!
[1359]	243	!-- First calculate the storage necessary for sending and receiving the data.
	244	!-- Compute only first (nxl) and last (nxr) loop iterration.
	245	DO ip = nxl, nxr, nxr - nxl
	246	DO jp = nys, nyn
	247	DO kp = nzb+1, nzt
[849]	248
[1359]	249	number_of_particles = prt_count(kp,jp,ip)
	250	IF ( number_of_particles <= 0 ) CYCLE
	251	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	252	DO n = 1, number_of_particles
	253	IF ( particles(n)%particle_mask ) THEN
	254	i = ( particles(n)%x + 0.5_wp * dx ) * ddx
[1929]	255	!
	256	!-- Above calculation does not work for indices less than zero
[1359]	257	IF ( particles(n)%x < -0.5_wp * dx ) i = -1
	258
	259	IF ( i < nxl ) THEN
	260	trlp_count = trlp_count + 1
	261	ELSEIF ( i > nxr ) THEN
	262	trrp_count = trrp_count + 1
	263	ENDIF
	264	ENDIF
	265	ENDDO
	266
	267	ENDDO
	268	ENDDO
[849]	269	ENDDO
	270
	271	IF ( trlp_count == 0 ) trlp_count = 1
	272	IF ( trrp_count == 0 ) trrp_count = 1
	273
	274	ALLOCATE( trlp(trlp_count), trrp(trrp_count) )
	275
[1359]	276	trlp = zero_particle
	277	trrp = zero_particle
[849]	278
	279	trlp_count = 0
	280	trrp_count = 0
	281
	282	ENDIF
[1359]	283	!
	284	!-- Compute only first (nxl) and last (nxr) loop iterration
[1929]	285	DO ip = nxl, nxr, nxr-nxl
[1359]	286	DO jp = nys, nyn
	287	DO kp = nzb+1, nzt
	288	number_of_particles = prt_count(kp,jp,ip)
	289	IF ( number_of_particles <= 0 ) CYCLE
	290	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	291	DO n = 1, number_of_particles
	292	!
	293	!-- Only those particles that have not been marked as 'deleted' may
	294	!-- be moved.
	295	IF ( particles(n)%particle_mask ) THEN
[849]	296
[1359]	297	i = ( particles(n)%x + 0.5_wp * dx ) * ddx
[1929]	298	!
	299	!-- Above calculation does not work for indices less than zero
[1359]	300	IF ( particles(n)%x < - 0.5_wp * dx ) i = -1
[849]	301
[1359]	302	IF ( i < nxl ) THEN
	303	IF ( i < 0 ) THEN
[1929]	304	!
	305	!-- Apply boundary condition along x
[1359]	306	IF ( ibc_par_lr == 0 ) THEN
[1929]	307	!
	308	!-- Cyclic condition
[1359]	309	IF ( pdims(1) == 1 ) THEN
	310	particles(n)%x = ( nx + 1 ) * dx + particles(n)%x
	311	particles(n)%origin_x = ( nx + 1 ) * dx + &
	312	particles(n)%origin_x
	313	ELSE
	314	trlp_count = trlp_count + 1
	315	trlp(trlp_count) = particles(n)
	316	trlp(trlp_count)%x = ( nx + 1 ) * dx + trlp(trlp_count)%x
	317	trlp(trlp_count)%origin_x = trlp(trlp_count)%origin_x + &
	318	( nx + 1 ) * dx
	319	particles(n)%particle_mask = .FALSE.
	320	deleted_particles = deleted_particles + 1
[849]	321
[1359]	322	IF ( trlp(trlp_count)%x >= (nx + 0.5_wp)* dx - 1.0E-12_wp ) THEN
	323	trlp(trlp_count)%x = trlp(trlp_count)%x - 1.0E-10_wp
	324	!++ why is 1 subtracted in next statement???
	325	trlp(trlp_count)%origin_x = trlp(trlp_count)%origin_x - 1
	326	ENDIF
[849]	327
[1359]	328	ENDIF
[849]	329
[1359]	330	ELSEIF ( ibc_par_lr == 1 ) THEN
[1929]	331	!
	332	!-- Particle absorption
[1359]	333	particles(n)%particle_mask = .FALSE.
	334	deleted_particles = deleted_particles + 1
[849]	335
[1359]	336	ELSEIF ( ibc_par_lr == 2 ) THEN
[1929]	337	!
	338	!-- Particle reflection
[1359]	339	particles(n)%x = -particles(n)%x
	340	particles(n)%speed_x = -particles(n)%speed_x
[849]	341
[1359]	342	ENDIF
	343	ELSE
[1929]	344	!
	345	!-- Store particle data in the transfer array, which will be
	346	!-- send to the neighbouring PE
[1359]	347	trlp_count = trlp_count + 1
	348	trlp(trlp_count) = particles(n)
	349	particles(n)%particle_mask = .FALSE.
	350	deleted_particles = deleted_particles + 1
[849]	351
[1359]	352	ENDIF
[849]	353
[1359]	354	ELSEIF ( i > nxr ) THEN
	355	IF ( i > nx ) THEN
[1929]	356	!
	357	!-- Apply boundary condition along x
[1359]	358	IF ( ibc_par_lr == 0 ) THEN
[1929]	359	!
	360	!-- Cyclic condition
[1359]	361	IF ( pdims(1) == 1 ) THEN
	362	particles(n)%x = particles(n)%x - ( nx + 1 ) * dx
	363	particles(n)%origin_x = particles(n)%origin_x - &
	364	( nx + 1 ) * dx
	365	ELSE
	366	trrp_count = trrp_count + 1
	367	trrp(trrp_count) = particles(n)
	368	trrp(trrp_count)%x = trrp(trrp_count)%x - ( nx + 1 ) * dx
	369	trrp(trrp_count)%origin_x = trrp(trrp_count)%origin_x - &
	370	( nx + 1 ) * dx
	371	particles(n)%particle_mask = .FALSE.
	372	deleted_particles = deleted_particles + 1
[849]	373
[1359]	374	ENDIF
[849]	375
[1359]	376	ELSEIF ( ibc_par_lr == 1 ) THEN
[1929]	377	!
	378	!-- Particle absorption
[1359]	379	particles(n)%particle_mask = .FALSE.
	380	deleted_particles = deleted_particles + 1
[849]	381
[1359]	382	ELSEIF ( ibc_par_lr == 2 ) THEN
[1929]	383	!
	384	!-- Particle reflection
[1359]	385	particles(n)%x = 2 * ( nx * dx ) - particles(n)%x
	386	particles(n)%speed_x = -particles(n)%speed_x
[849]	387
[1359]	388	ENDIF
	389	ELSE
[1929]	390	!
	391	!-- Store particle data in the transfer array, which will be send
	392	!-- to the neighbouring PE
[1359]	393	trrp_count = trrp_count + 1
	394	trrp(trrp_count) = particles(n)
	395	particles(n)%particle_mask = .FALSE.
	396	deleted_particles = deleted_particles + 1
[849]	397
[1359]	398	ENDIF
[849]	399
[1359]	400	ENDIF
	401	ENDIF
[1929]	402
[1359]	403	ENDDO
	404	ENDDO
	405	ENDDO
[849]	406	ENDDO
	407
	408	!
[1929]	409	!-- Allocate arrays required for north-south exchange, as these
	410	!-- are used directly after particles are exchange along x-direction.
	411	ALLOCATE( move_also_north(1:NR_2_direction_move) )
	412	ALLOCATE( move_also_south(1:NR_2_direction_move) )
	413
	414	nr_move_north = 0
	415	nr_move_south = 0
	416	!
[849]	417	!-- Send left boundary, receive right boundary (but first exchange how many
	418	!-- and check, if particle storage must be extended)
	419	IF ( pdims(1) /= 1 ) THEN
	420
	421	CALL MPI_SENDRECV( trlp_count, 1, MPI_INTEGER, pleft, 0, &
	422	trrp_count_recv, 1, MPI_INTEGER, pright, 0, &
	423	comm2d, status, ierr )
	424
[1359]	425	ALLOCATE(rvrp(MAX(1,trrp_count_recv)))
[2305]	426	!
	427	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
	428	!-- variables in structure particle_type (due to the calculation of par_size)
	429	par_size = c_sizeof(trlp(1))
	430	CALL MPI_SENDRECV( trlp, max(1,trlp_count)*par_size, MPI_BYTE,&
	431	pleft, 1, rvrp, &
	432	max(1,trrp_count_recv)*par_size, MPI_BYTE, pright, 1,&
[849]	433	comm2d, status, ierr )
	434
[1359]	435	IF ( trrp_count_recv > 0 ) CALL Add_particles_to_gridcell(rvrp(1:trrp_count_recv))
	436
	437	DEALLOCATE(rvrp)
	438
[849]	439	!
	440	!-- Send right boundary, receive left boundary
	441	CALL MPI_SENDRECV( trrp_count, 1, MPI_INTEGER, pright, 0, &
	442	trlp_count_recv, 1, MPI_INTEGER, pleft, 0, &
	443	comm2d, status, ierr )
	444
[1359]	445	ALLOCATE(rvlp(MAX(1,trlp_count_recv)))
[2305]	446	!
	447	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
	448	!-- variables in structure particle_type (due to the calculation of par_size)
	449	par_size = c_sizeof(trrp(1))
	450	CALL MPI_SENDRECV( trrp, max(1,trrp_count)*par_size, MPI_BYTE,&
	451	pright, 1, rvlp, &
	452	max(1,trlp_count_recv)*par_size, MPI_BYTE, pleft, 1, &
[849]	453	comm2d, status, ierr )
	454
[1359]	455	IF ( trlp_count_recv > 0 ) CALL Add_particles_to_gridcell(rvlp(1:trlp_count_recv))
	456
[1822]	457	DEALLOCATE( rvlp )
[1359]	458	DEALLOCATE( trlp, trrp )
[849]	459
	460	ENDIF
	461
	462	!
	463	!-- Check whether particles have crossed the boundaries in y direction. Note
	464	!-- that this case can also apply to particles that have just been received
	465	!-- from the adjacent right or left PE.
	466	!-- Find out first the number of particles to be transferred and allocate
	467	!-- temporary arrays needed to store them.
[1929]	468	!-- For a one-dimensional decomposition along y, no transfer is necessary,
[849]	469	!-- because the particle remains on the PE.
[1359]	470	trsp_count = nr_move_south
	471	trnp_count = nr_move_north
[849]	472
	473	trsp_count_recv = 0
	474	trnp_count_recv = 0
	475
	476	IF ( pdims(2) /= 1 ) THEN
	477	!
	478	!-- First calculate the storage necessary for sending and receiving the
	479	!-- data
[1359]	480	DO ip = nxl, nxr
[1929]	481	DO jp = nys, nyn, nyn-nys !compute only first (nys) and last (nyn) loop iterration
[1359]	482	DO kp = nzb+1, nzt
	483	number_of_particles = prt_count(kp,jp,ip)
	484	IF ( number_of_particles <= 0 ) CYCLE
	485	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	486	DO n = 1, number_of_particles
	487	IF ( particles(n)%particle_mask ) THEN
	488	j = ( particles(n)%y + 0.5_wp * dy ) * ddy
[849]	489	!
[1359]	490	!-- Above calculation does not work for indices less than zero
	491	IF ( particles(n)%y < -0.5_wp * dy ) j = -1
[849]	492
[1359]	493	IF ( j < nys ) THEN
	494	trsp_count = trsp_count + 1
	495	ELSEIF ( j > nyn ) THEN
	496	trnp_count = trnp_count + 1
	497	ENDIF
	498	ENDIF
	499	ENDDO
	500	ENDDO
	501	ENDDO
[849]	502	ENDDO
	503
	504	IF ( trsp_count == 0 ) trsp_count = 1
	505	IF ( trnp_count == 0 ) trnp_count = 1
	506
	507	ALLOCATE( trsp(trsp_count), trnp(trnp_count) )
	508
[1359]	509	trsp = zero_particle
	510	trnp = zero_particle
[849]	511
[1359]	512	trsp_count = nr_move_south
	513	trnp_count = nr_move_north
[1929]	514
[1359]	515	trsp(1:nr_move_south) = move_also_south(1:nr_move_south)
	516	trnp(1:nr_move_north) = move_also_north(1:nr_move_north)
	517
[849]	518	ENDIF
	519
[1359]	520	DO ip = nxl, nxr
	521	DO jp = nys, nyn, nyn-nys ! compute only first (nys) and last (nyn) loop iterration
	522	DO kp = nzb+1, nzt
	523	number_of_particles = prt_count(kp,jp,ip)
	524	IF ( number_of_particles <= 0 ) CYCLE
	525	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	526	DO n = 1, number_of_particles
[849]	527	!
[1359]	528	!-- Only those particles that have not been marked as 'deleted' may
	529	!-- be moved.
	530	IF ( particles(n)%particle_mask ) THEN
[1929]	531
[1359]	532	j = ( particles(n)%y + 0.5_wp * dy ) * ddy
[849]	533	!
[1359]	534	!-- Above calculation does not work for indices less than zero
	535	IF ( particles(n)%y < -0.5_wp * dy ) j = -1
[849]	536
[1359]	537	IF ( j < nys ) THEN
	538	IF ( j < 0 ) THEN
[849]	539	!
[1359]	540	!-- Apply boundary condition along y
	541	IF ( ibc_par_ns == 0 ) THEN
[849]	542	!
[1359]	543	!-- Cyclic condition
	544	IF ( pdims(2) == 1 ) THEN
	545	particles(n)%y = ( ny + 1 ) * dy + particles(n)%y
	546	particles(n)%origin_y = ( ny + 1 ) * dy + &
[1929]	547	particles(n)%origin_y
[1359]	548	ELSE
[1929]	549	trsp_count = trsp_count + 1
	550	trsp(trsp_count) = particles(n)
[1359]	551	trsp(trsp_count)%y = ( ny + 1 ) * dy + &
[1929]	552	trsp(trsp_count)%y
[1359]	553	trsp(trsp_count)%origin_y = trsp(trsp_count)%origin_y &
[1929]	554	+ ( ny + 1 ) * dy
[1359]	555	particles(n)%particle_mask = .FALSE.
	556	deleted_particles = deleted_particles + 1
[849]	557
[1359]	558	IF ( trsp(trsp_count)%y >= (ny+0.5_wp)* dy - 1.0E-12_wp ) THEN
	559	trsp(trsp_count)%y = trsp(trsp_count)%y - 1.0E-10_wp
	560	!++ why is 1 subtracted in next statement???
	561	trsp(trsp_count)%origin_y = &
[1929]	562	trsp(trsp_count)%origin_y - 1
[1359]	563	ENDIF
[849]	564
[1359]	565	ENDIF
[849]	566
[1359]	567	ELSEIF ( ibc_par_ns == 1 ) THEN
[849]	568	!
[1359]	569	!-- Particle absorption
	570	particles(n)%particle_mask = .FALSE.
[1929]	571	deleted_particles = deleted_particles + 1
[849]	572
[1359]	573	ELSEIF ( ibc_par_ns == 2 ) THEN
[849]	574	!
[1359]	575	!-- Particle reflection
	576	particles(n)%y = -particles(n)%y
	577	particles(n)%speed_y = -particles(n)%speed_y
[849]	578
[1359]	579	ENDIF
	580	ELSE
[849]	581	!
[1359]	582	!-- Store particle data in the transfer array, which will
	583	!-- be send to the neighbouring PE
	584	trsp_count = trsp_count + 1
	585	trsp(trsp_count) = particles(n)
	586	particles(n)%particle_mask = .FALSE.
	587	deleted_particles = deleted_particles + 1
[849]	588
[1359]	589	ENDIF
[849]	590
[1359]	591	ELSEIF ( j > nyn ) THEN
	592	IF ( j > ny ) THEN
[849]	593	!
[1929]	594	!-- Apply boundary condition along y
[1359]	595	IF ( ibc_par_ns == 0 ) THEN
[849]	596	!
[1359]	597	!-- Cyclic condition
	598	IF ( pdims(2) == 1 ) THEN
[1929]	599	particles(n)%y = particles(n)%y - ( ny + 1 ) * dy
[1359]	600	particles(n)%origin_y = &
[1929]	601	particles(n)%origin_y - ( ny + 1 ) * dy
[1359]	602	ELSE
[1929]	603	trnp_count = trnp_count + 1
	604	trnp(trnp_count) = particles(n)
[1359]	605	trnp(trnp_count)%y = &
[1929]	606	trnp(trnp_count)%y - ( ny + 1 ) * dy
[1359]	607	trnp(trnp_count)%origin_y = &
[1929]	608	trnp(trnp_count)%origin_y - ( ny + 1 ) * dy
[1359]	609	particles(n)%particle_mask = .FALSE.
[1929]	610	deleted_particles = deleted_particles + 1
[1359]	611	ENDIF
[849]	612
[1359]	613	ELSEIF ( ibc_par_ns == 1 ) THEN
[849]	614	!
[1359]	615	!-- Particle absorption
	616	particles(n)%particle_mask = .FALSE.
	617	deleted_particles = deleted_particles + 1
[849]	618
[1359]	619	ELSEIF ( ibc_par_ns == 2 ) THEN
[849]	620	!
[1359]	621	!-- Particle reflection
	622	particles(n)%y = 2 * ( ny * dy ) - particles(n)%y
	623	particles(n)%speed_y = -particles(n)%speed_y
[849]	624
[1359]	625	ENDIF
	626	ELSE
[849]	627	!
[1359]	628	!-- Store particle data in the transfer array, which will
	629	!-- be send to the neighbouring PE
	630	trnp_count = trnp_count + 1
	631	trnp(trnp_count) = particles(n)
	632	particles(n)%particle_mask = .FALSE.
	633	deleted_particles = deleted_particles + 1
[849]	634
[1359]	635	ENDIF
	636
	637	ENDIF
[849]	638	ENDIF
[1359]	639	ENDDO
	640	ENDDO
	641	ENDDO
[849]	642	ENDDO
	643
	644	!
	645	!-- Send front boundary, receive back boundary (but first exchange how many
	646	!-- and check, if particle storage must be extended)
	647	IF ( pdims(2) /= 1 ) THEN
	648
	649	CALL MPI_SENDRECV( trsp_count, 1, MPI_INTEGER, psouth, 0, &
	650	trnp_count_recv, 1, MPI_INTEGER, pnorth, 0, &
	651	comm2d, status, ierr )
	652
[1359]	653	ALLOCATE(rvnp(MAX(1,trnp_count_recv)))
[2305]	654	!
	655	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
	656	!-- variables in structure particle_type (due to the calculation of par_size)
	657	par_size = c_sizeof(trsp(1))
	658	CALL MPI_SENDRECV( trsp, trsp_count*par_size, MPI_BYTE, &
	659	psouth, 1, rvnp, &
	660	trnp_count_recv*par_size, MPI_BYTE, pnorth, 1, &
[849]	661	comm2d, status, ierr )
	662
[1359]	663	IF ( trnp_count_recv > 0 ) CALL Add_particles_to_gridcell(rvnp(1:trnp_count_recv))
	664
	665	DEALLOCATE(rvnp)
	666
[849]	667	!
	668	!-- Send back boundary, receive front boundary
	669	CALL MPI_SENDRECV( trnp_count, 1, MPI_INTEGER, pnorth, 0, &
	670	trsp_count_recv, 1, MPI_INTEGER, psouth, 0, &
	671	comm2d, status, ierr )
	672
[1359]	673	ALLOCATE(rvsp(MAX(1,trsp_count_recv)))
[2305]	674	!
	675	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
	676	!-- variables in structure particle_type (due to the calculation of par_size)
	677	par_size = c_sizeof(trnp(1))
	678	CALL MPI_SENDRECV( trnp, trnp_count*par_size, MPI_BYTE, &
	679	pnorth, 1, rvsp, &
	680	trsp_count_recv*par_size, MPI_BYTE, psouth, 1, &
[849]	681	comm2d, status, ierr )
	682
[1359]	683	IF ( trsp_count_recv > 0 ) CALL Add_particles_to_gridcell(rvsp(1:trsp_count_recv))
	684
	685	DEALLOCATE(rvsp)
	686
[849]	687	number_of_particles = number_of_particles + trsp_count_recv
	688
	689	DEALLOCATE( trsp, trnp )
	690
	691	ENDIF
	692
[1929]	693	DEALLOCATE( move_also_north )
	694	DEALLOCATE( move_also_south )
	695
[849]	696	#else
	697
[1929]	698	DO ip = nxl, nxr, nxr-nxl
	699	DO jp = nys, nyn
	700	DO kp = nzb+1, nzt
	701	number_of_particles = prt_count(kp,jp,ip)
	702	IF ( number_of_particles <= 0 ) CYCLE
	703	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	704	DO n = 1, number_of_particles
[849]	705	!
[1929]	706	!-- Apply boundary conditions
[849]	707
[1929]	708	IF ( particles(n)%x < -0.5_wp * dx ) THEN
[849]	709
[1929]	710	IF ( ibc_par_lr == 0 ) THEN
[849]	711	!
[1929]	712	!-- Cyclic boundary. Relevant coordinate has to be changed.
	713	particles(n)%x = ( nx + 1 ) * dx + particles(n)%x
[1822]	714
[1929]	715	ELSEIF ( ibc_par_lr == 1 ) THEN
[849]	716	!
[1929]	717	!-- Particle absorption
	718	particles(n)%particle_mask = .FALSE.
	719	deleted_particles = deleted_particles + 1
[1822]	720
[1929]	721	ELSEIF ( ibc_par_lr == 2 ) THEN
[849]	722	!
[1929]	723	!-- Particle reflection
	724	particles(n)%x = -dx - particles(n)%x
	725	particles(n)%speed_x = -particles(n)%speed_x
	726	ENDIF
[849]	727
[1929]	728	ELSEIF ( particles(n)%x >= ( nx + 0.5_wp ) * dx ) THEN
[849]	729
[1929]	730	IF ( ibc_par_lr == 0 ) THEN
[849]	731	!
[1929]	732	!-- Cyclic boundary. Relevant coordinate has to be changed.
	733	particles(n)%x = particles(n)%x - ( nx + 1 ) * dx
[1822]	734
[1929]	735	ELSEIF ( ibc_par_lr == 1 ) THEN
[849]	736	!
[1929]	737	!-- Particle absorption
	738	particles(n)%particle_mask = .FALSE.
	739	deleted_particles = deleted_particles + 1
[1822]	740
[1929]	741	ELSEIF ( ibc_par_lr == 2 ) THEN
[849]	742	!
[1929]	743	!-- Particle reflection
	744	particles(n)%x = ( nx + 1 ) * dx - particles(n)%x
	745	particles(n)%speed_x = -particles(n)%speed_x
	746	ENDIF
[849]	747
[1929]	748	ENDIF
	749	ENDDO
	750	ENDDO
	751	ENDDO
	752	ENDDO
[849]	753
[1929]	754	DO ip = nxl, nxr
	755	DO jp = nys, nyn, nyn-nys
	756	DO kp = nzb+1, nzt
	757	number_of_particles = prt_count(kp,jp,ip)
	758	IF ( number_of_particles <= 0 ) CYCLE
	759	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	760	DO n = 1, number_of_particles
[849]	761
[1929]	762	IF ( particles(n)%y < -0.5_wp * dy ) THEN
	763
	764	IF ( ibc_par_ns == 0 ) THEN
[849]	765	!
[1929]	766	!-- Cyclic boundary. Relevant coordinate has to be changed.
	767	particles(n)%y = ( ny + 1 ) * dy + particles(n)%y
[1822]	768
[1929]	769	ELSEIF ( ibc_par_ns == 1 ) THEN
[849]	770	!
[1929]	771	!-- Particle absorption
	772	particles(n)%particle_mask = .FALSE.
	773	deleted_particles = deleted_particles + 1
[1822]	774
[1929]	775	ELSEIF ( ibc_par_ns == 2 ) THEN
[849]	776	!
[1929]	777	!-- Particle reflection
	778	particles(n)%y = -dy - particles(n)%y
	779	particles(n)%speed_y = -particles(n)%speed_y
	780	ENDIF
[849]	781
[1929]	782	ELSEIF ( particles(n)%y >= ( ny + 0.5_wp ) * dy ) THEN
[849]	783
[1929]	784	IF ( ibc_par_ns == 0 ) THEN
[849]	785	!
[1929]	786	!-- Cyclic boundary. Relevant coordinate has to be changed.
	787	particles(n)%y = particles(n)%y - ( ny + 1 ) * dy
[1822]	788
[1929]	789	ELSEIF ( ibc_par_ns == 1 ) THEN
[849]	790	!
[1929]	791	!-- Particle absorption
	792	particles(n)%particle_mask = .FALSE.
	793	deleted_particles = deleted_particles + 1
[1822]	794
[1929]	795	ELSEIF ( ibc_par_ns == 2 ) THEN
[849]	796	!
[1929]	797	!-- Particle reflection
	798	particles(n)%y = ( ny + 1 ) * dy - particles(n)%y
	799	particles(n)%speed_y = -particles(n)%speed_y
	800	ENDIF
[849]	801
[1929]	802	ENDIF
	803
	804	ENDDO
	805	ENDDO
	806	ENDDO
[849]	807	ENDDO
	808	#endif
	809
	810	!
	811	!-- Accumulate the number of particles transferred between the subdomains
	812	#if defined( __parallel )
	813	trlp_count_sum = trlp_count_sum + trlp_count
	814	trlp_count_recv_sum = trlp_count_recv_sum + trlp_count_recv
	815	trrp_count_sum = trrp_count_sum + trrp_count
	816	trrp_count_recv_sum = trrp_count_recv_sum + trrp_count_recv
	817	trsp_count_sum = trsp_count_sum + trsp_count
	818	trsp_count_recv_sum = trsp_count_recv_sum + trsp_count_recv
	819	trnp_count_sum = trnp_count_sum + trnp_count
	820	trnp_count_recv_sum = trnp_count_recv_sum + trnp_count_recv
	821	#endif
	822
[1359]	823	CALL cpu_log( log_point_s(23), 'lpm_exchange_horiz', 'stop' )
[849]	824
	825	END SUBROUTINE lpm_exchange_horiz
[1359]	826
[1682]	827	!------------------------------------------------------------------------------!
	828	! Description:
	829	! ------------
	830	!> If a particle moves from one processor to another, this subroutine moves
	831	!> the corresponding elements from the particle arrays of the old grid cells
	832	!> to the particle arrays of the new grid cells.
	833	!------------------------------------------------------------------------------!
[1359]	834	SUBROUTINE Add_particles_to_gridcell (particle_array)
	835
	836	IMPLICIT NONE
	837
[1929]	838	INTEGER(iwp) :: ip !< grid index (x) of particle
	839	INTEGER(iwp) :: jp !< grid index (x) of particle
	840	INTEGER(iwp) :: kp !< grid index (x) of particle
	841	INTEGER(iwp) :: n !< index variable of particle
	842	INTEGER(iwp) :: pindex !< dummy argument for new number of particles per grid box
[1359]	843
[1682]	844	LOGICAL :: pack_done !<
[1359]	845
[1929]	846	TYPE(particle_type), DIMENSION(:), INTENT(IN) :: particle_array !< new particles in a grid box
	847	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: temp_ns !< temporary particle array for reallocation
[1359]	848
	849	pack_done = .FALSE.
	850
[1929]	851	DO n = 1, SIZE(particle_array)
[1359]	852
[1929]	853	IF ( .NOT. particle_array(n)%particle_mask ) CYCLE
	854
[1359]	855	ip = ( particle_array(n)%x + 0.5_wp * dx ) * ddx
	856	jp = ( particle_array(n)%y + 0.5_wp * dy ) * ddy
[1929]	857	kp = particle_array(n)%z / dz + 1 + offset_ocean_nzt
[1359]	858
	859	IF ( ip >= nxl .AND. ip <= nxr .AND. jp >= nys .AND. jp <= nyn &
	860	.AND. kp >= nzb+1 .AND. kp <= nzt) THEN ! particle stays on processor
	861	number_of_particles = prt_count(kp,jp,ip)
	862	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	863
	864	pindex = prt_count(kp,jp,ip)+1
	865	IF( pindex > SIZE(grid_particles(kp,jp,ip)%particles) ) THEN
	866	IF ( pack_done ) THEN
	867	CALL realloc_particles_array (ip,jp,kp)
	868	ELSE
	869	CALL lpm_pack_arrays
	870	prt_count(kp,jp,ip) = number_of_particles
	871	pindex = prt_count(kp,jp,ip)+1
	872	IF ( pindex > SIZE(grid_particles(kp,jp,ip)%particles) ) THEN
	873	CALL realloc_particles_array (ip,jp,kp)
	874	ENDIF
	875	pack_done = .TRUE.
	876	ENDIF
	877	ENDIF
	878	grid_particles(kp,jp,ip)%particles(pindex) = particle_array(n)
	879	prt_count(kp,jp,ip) = pindex
	880	ELSE
[1929]	881	IF ( jp <= nys - 1 ) THEN
[1359]	882	nr_move_south = nr_move_south+1
[1929]	883	!
	884	!-- Before particle information is swapped to exchange-array, check
	885	!-- if enough memory is allocated. If required, reallocate exchange
	886	!-- array.
	887	IF ( nr_move_south > SIZE(move_also_south) ) THEN
	888	!
	889	!-- At first, allocate further temporary array to swap particle
	890	!-- information.
	891	ALLOCATE( temp_ns(SIZE(move_also_south)+NR_2_direction_move) )
	892	temp_ns(1:nr_move_south-1) = move_also_south(1:nr_move_south-1)
	893	DEALLOCATE( move_also_south )
	894	ALLOCATE( move_also_south(SIZE(temp_ns)) )
	895	move_also_south(1:nr_move_south-1) = temp_ns(1:nr_move_south-1)
	896	DEALLOCATE( temp_ns )
	897
	898	ENDIF
	899
[1359]	900	move_also_south(nr_move_south) = particle_array(n)
[1929]	901
[1359]	902	IF ( jp == -1 ) THEN
[2245]	903	!
	904	!-- Apply boundary condition along y
	905	IF ( ibc_par_ns == 0 ) THEN
	906	move_also_south(nr_move_south)%y = &
	907	move_also_south(nr_move_south)%y + ( ny + 1 ) * dy
	908	move_also_south(nr_move_south)%origin_y = &
	909	move_also_south(nr_move_south)%origin_y + ( ny + 1 ) * dy
	910	ELSEIF ( ibc_par_ns == 1 ) THEN
	911	!
	912	!-- Particle absorption
	913	move_also_south(nr_move_south)%particle_mask = .FALSE.
	914	deleted_particles = deleted_particles + 1
	915
	916	ELSEIF ( ibc_par_ns == 2 ) THEN
	917	!
	918	!-- Particle reflection
	919	move_also_south(nr_move_south)%y = &
	920	-move_also_south(nr_move_south)%y
	921	move_also_south(nr_move_south)%speed_y = &
	922	-move_also_south(nr_move_south)%speed_y
	923
	924	ENDIF
[1359]	925	ENDIF
[1929]	926	ELSEIF ( jp >= nyn+1 ) THEN
[1359]	927	nr_move_north = nr_move_north+1
[1929]	928	!
	929	!-- Before particle information is swapped to exchange-array, check
	930	!-- if enough memory is allocated. If required, reallocate exchange
	931	!-- array.
	932	IF ( nr_move_north > SIZE(move_also_north) ) THEN
	933	!
	934	!-- At first, allocate further temporary array to swap particle
	935	!-- information.
	936	ALLOCATE( temp_ns(SIZE(move_also_north)+NR_2_direction_move) )
	937	temp_ns(1:nr_move_north-1) = move_also_south(1:nr_move_north-1)
	938	DEALLOCATE( move_also_north )
	939	ALLOCATE( move_also_north(SIZE(temp_ns)) )
	940	move_also_north(1:nr_move_north-1) = temp_ns(1:nr_move_north-1)
	941	DEALLOCATE( temp_ns )
	942
	943	ENDIF
	944
[1359]	945	move_also_north(nr_move_north) = particle_array(n)
	946	IF ( jp == ny+1 ) THEN
[2245]	947	!
	948	!-- Apply boundary condition along y
	949	IF ( ibc_par_ns == 0 ) THEN
	950
	951	move_also_north(nr_move_north)%y = &
	952	move_also_north(nr_move_north)%y - ( ny + 1 ) * dy
	953	move_also_north(nr_move_north)%origin_y = &
	954	move_also_north(nr_move_north)%origin_y - ( ny + 1 ) * dy
	955	ELSEIF ( ibc_par_ns == 1 ) THEN
	956	!
	957	!-- Particle absorption
	958	move_also_north(nr_move_north)%particle_mask = .FALSE.
	959	deleted_particles = deleted_particles + 1
	960
	961	ELSEIF ( ibc_par_ns == 2 ) THEN
	962	!
	963	!-- Particle reflection
	964	move_also_north(nr_move_north)%y = &
	965	-move_also_north(nr_move_north)%y
	966	move_also_north(nr_move_north)%speed_y = &
	967	-move_also_north(nr_move_north)%speed_y
	968
	969	ENDIF
[1359]	970	ENDIF
	971	ELSE
	972	WRITE(0,'(a,8i7)') 'particle out of range ',myid,ip,jp,kp,nxl,nxr,nys,nyn
	973	ENDIF
	974	ENDIF
	975	ENDDO
	976
	977	RETURN
	978
	979	END SUBROUTINE Add_particles_to_gridcell
	980
	981
	982
	983
[1682]	984	!------------------------------------------------------------------------------!
	985	! Description:
	986	! ------------
	987	!> If a particle moves from one grid cell to another (on the current
	988	!> processor!), this subroutine moves the corresponding element from the
	989	!> particle array of the old grid cell to the particle array of the new grid
	990	!> cell.
	991	!------------------------------------------------------------------------------!
[1359]	992	SUBROUTINE lpm_move_particle
	993
	994	IMPLICIT NONE
	995
[1929]	996	INTEGER(iwp) :: i !< grid index (x) of particle position
	997	INTEGER(iwp) :: ip !< index variable along x
	998	INTEGER(iwp) :: j !< grid index (y) of particle position
	999	INTEGER(iwp) :: jp !< index variable along y
	1000	INTEGER(iwp) :: k !< grid index (z) of particle position
	1001	INTEGER(iwp) :: kp !< index variable along z
	1002	INTEGER(iwp) :: n !< index variable for particle array
	1003	INTEGER(iwp) :: np_old_cell !< number of particles per grid box before moving
	1004	INTEGER(iwp) :: n_start !< start index
	1005	INTEGER(iwp) :: pindex !< dummy argument for number of new particle per grid box
[1359]	1006
[1682]	1007	LOGICAL :: pack_done !<
[1359]	1008
[1929]	1009	TYPE(particle_type), DIMENSION(:), POINTER :: particles_old_cell !< particles before moving
[1359]	1010
	1011	CALL cpu_log( log_point_s(41), 'lpm_move_particle', 'start' )
	1012
	1013	DO ip = nxl, nxr
	1014	DO jp = nys, nyn
	1015	DO kp = nzb+1, nzt
	1016
	1017	np_old_cell = prt_count(kp,jp,ip)
	1018	IF ( np_old_cell <= 0 ) CYCLE
	1019	particles_old_cell => grid_particles(kp,jp,ip)%particles(1:np_old_cell)
	1020	n_start = -1
	1021
	1022	DO n = 1, np_old_cell
	1023	i = ( particles_old_cell(n)%x + 0.5_wp * dx ) * ddx
	1024	j = ( particles_old_cell(n)%y + 0.5_wp * dy ) * ddy
	1025	k = particles_old_cell(n)%z / dz + 1 + offset_ocean_nzt
	1026	!
	1027	!-- Check, if particle has moved to another grid cell.
	1028	IF ( i /= ip .OR. j /= jp .OR. k /= kp ) THEN
	1029	!
	1030	!-- The particle has moved to another grid cell. Now check, if
	1031	!-- particle stays on the same processor.
	1032	IF ( i >= nxl .AND. i <= nxr .AND. j >= nys .AND. &
	1033	j <= nyn .AND. k >= nzb+1 .AND. k <= nzt) THEN
	1034	!
	1035	!-- If the particle stays on the same processor, the particle
	1036	!-- will be added to the particle array of the new processor.
	1037	number_of_particles = prt_count(k,j,i)
	1038	particles => grid_particles(k,j,i)%particles(1:number_of_particles)
	1039
	1040	pindex = prt_count(k,j,i)+1
	1041	IF ( pindex > SIZE(grid_particles(k,j,i)%particles) ) &
	1042	THEN
	1043	n_start = n
	1044	EXIT
	1045	ENDIF
	1046
	1047	grid_particles(k,j,i)%particles(pindex) = particles_old_cell(n)
	1048	prt_count(k,j,i) = pindex
	1049
	1050	particles_old_cell(n)%particle_mask = .FALSE.
	1051	ENDIF
	1052	ENDIF
	1053	ENDDO
	1054
[1691]	1055	IF ( n_start >= 0 ) THEN
[1359]	1056	pack_done = .FALSE.
	1057	DO n = n_start, np_old_cell
	1058	i = ( particles_old_cell(n)%x + 0.5_wp * dx ) * ddx
	1059	j = ( particles_old_cell(n)%y + 0.5_wp * dy ) * ddy
	1060	k = particles_old_cell(n)%z / dz + 1 + offset_ocean_nzt
	1061	IF ( i /= ip .OR. j /= jp .OR. k /= kp ) THEN
	1062	!
	1063	!-- Particle is in different box
	1064	IF ( i >= nxl .AND. i <= nxr .AND. j >= nys .AND. &
	1065	j <= nyn .AND. k >= nzb+1 .AND. k <= nzt) THEN
	1066	!
	1067	!-- Particle stays on processor
	1068	number_of_particles = prt_count(k,j,i)
	1069	particles => grid_particles(k,j,i)%particles(1:number_of_particles)
	1070
	1071	pindex = prt_count(k,j,i)+1
	1072	IF ( pindex > SIZE(grid_particles(k,j,i)%particles) ) &
	1073	THEN
	1074	IF ( pack_done ) THEN
	1075	CALL realloc_particles_array(i,j,k)
	1076	ELSE
	1077	CALL lpm_pack_arrays
	1078	prt_count(k,j,i) = number_of_particles
	1079	!
[2151]	1080	!-- Set pindex to next index of the modified
	1081	!-- particle-array (due to lpm_pack_arrays)
	1082	pindex = prt_count(k,j,i)+1
	1083	!
[1359]	1084	!-- If number of particles in the new grid box
	1085	!-- exceeds its allocated memory, the particle array
	1086	!-- will be reallocated
	1087	IF ( pindex > SIZE(grid_particles(k,j,i)%particles) ) THEN
	1088	CALL realloc_particles_array(i,j,k)
	1089	ENDIF
	1090
	1091	pack_done = .TRUE.
	1092	ENDIF
	1093	ENDIF
	1094
	1095	grid_particles(k,j,i)%particles(pindex) = particles_old_cell(n)
	1096	prt_count(k,j,i) = pindex
	1097
	1098	particles_old_cell(n)%particle_mask = .FALSE.
	1099	ENDIF
	1100	ENDIF
	1101	ENDDO
	1102	ENDIF
	1103	ENDDO
	1104	ENDDO
	1105	ENDDO
	1106
	1107	CALL cpu_log( log_point_s(41), 'lpm_move_particle', 'stop' )
	1108
	1109	RETURN
	1110
	1111	END SUBROUTINE lpm_move_particle
	1112
[1682]	1113	!------------------------------------------------------------------------------!
	1114	! Description:
	1115	! ------------
[1929]	1116	!> If the allocated memory for the particle array do not suffice to add arriving
	1117	!> particles from neighbour grid cells, this subrouting reallocates the
	1118	!> particle array to assure enough memory is available.
[1682]	1119	!------------------------------------------------------------------------------!
[1359]	1120	SUBROUTINE realloc_particles_array (i,j,k,size_in)
	1121
	1122	IMPLICIT NONE
	1123
[1682]	1124	INTEGER(iwp), INTENT(in) :: i !<
	1125	INTEGER(iwp), INTENT(in) :: j !<
	1126	INTEGER(iwp), INTENT(in) :: k !<
[1822]	1127	INTEGER(iwp), INTENT(in), OPTIONAL :: size_in !<
[1359]	1128
[1682]	1129	INTEGER(iwp) :: old_size !<
	1130	INTEGER(iwp) :: new_size !<
	1131	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: tmp_particles_d !<
	1132	TYPE(particle_type), DIMENSION(500) :: tmp_particles_s !<
[1359]	1133
	1134	old_size = SIZE(grid_particles(k,j,i)%particles)
	1135
	1136	IF ( PRESENT(size_in) ) THEN
	1137	new_size = size_in
	1138	ELSE
[1822]	1139	new_size = old_size * ( 1.0_wp + alloc_factor / 100.0_wp )
[1359]	1140	ENDIF
	1141
[1929]	1142	new_size = MAX( new_size, min_nr_particle, old_size + 1 )
[1359]	1143
	1144	IF ( old_size <= 500 ) THEN
	1145
	1146	tmp_particles_s(1:old_size) = grid_particles(k,j,i)%particles(1:old_size)
	1147
	1148	DEALLOCATE(grid_particles(k,j,i)%particles)
	1149	ALLOCATE(grid_particles(k,j,i)%particles(new_size))
	1150
	1151	grid_particles(k,j,i)%particles(1:old_size) = tmp_particles_s(1:old_size)
	1152	grid_particles(k,j,i)%particles(old_size+1:new_size) = zero_particle
	1153
	1154	ELSE
	1155
	1156	ALLOCATE(tmp_particles_d(new_size))
	1157	tmp_particles_d(1:old_size) = grid_particles(k,j,i)%particles
	1158
	1159	DEALLOCATE(grid_particles(k,j,i)%particles)
	1160	ALLOCATE(grid_particles(k,j,i)%particles(new_size))
	1161
	1162	grid_particles(k,j,i)%particles(1:old_size) = tmp_particles_d(1:old_size)
	1163	grid_particles(k,j,i)%particles(old_size+1:new_size) = zero_particle
	1164
	1165	DEALLOCATE(tmp_particles_d)
	1166
	1167	ENDIF
	1168	particles => grid_particles(k,j,i)%particles(1:number_of_particles)
	1169
	1170	RETURN
	1171	END SUBROUTINE realloc_particles_array
	1172
[1936]	1173
	1174
	1175
	1176
	1177	SUBROUTINE dealloc_particles_array
	1178
	1179	IMPLICIT NONE
	1180
	1181	INTEGER(iwp) :: i
	1182	INTEGER(iwp) :: j
	1183	INTEGER(iwp) :: k
	1184	INTEGER(iwp) :: old_size !<
	1185	INTEGER(iwp) :: new_size !<
	1186
	1187	LOGICAL :: dealloc
	1188
	1189	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: tmp_particles_d !<
	1190	TYPE(particle_type), DIMENSION(500) :: tmp_particles_s !<
	1191
	1192	DO i = nxl, nxr
	1193	DO j = nys, nyn
	1194	DO k = nzb+1, nzt
	1195	!
	1196	!-- Determine number of active particles
	1197	number_of_particles = prt_count(k,j,i)
	1198	!
	1199	!-- Determine allocated memory size
	1200	old_size = SIZE( grid_particles(k,j,i)%particles )
	1201	!
	1202	!-- Check for large unused memory
	1203	dealloc = ( ( number_of_particles < min_nr_particle .AND. &
	1204	old_size > min_nr_particle ) .OR. &
	1205	( number_of_particles > min_nr_particle .AND. &
	1206	old_size - number_of_particles * &
	1207	( 1.0_wp + 0.01_wp * alloc_factor ) > 0.0_wp ) )
	1208
	1209
	1210	IF ( dealloc ) THEN
	1211	IF ( number_of_particles < min_nr_particle ) THEN
	1212	new_size = min_nr_particle
	1213	ELSE
	1214	new_size = INT( number_of_particles * ( 1.0_wp + 0.01_wp * alloc_factor ) )
	1215	ENDIF
	1216
	1217	IF ( number_of_particles <= 500 ) THEN
	1218
	1219	tmp_particles_s(1:number_of_particles) = grid_particles(k,j,i)%particles(1:number_of_particles)
	1220
	1221	DEALLOCATE(grid_particles(k,j,i)%particles)
	1222	ALLOCATE(grid_particles(k,j,i)%particles(new_size))
	1223
	1224	grid_particles(k,j,i)%particles(1:number_of_particles) = tmp_particles_s(1:number_of_particles)
	1225	grid_particles(k,j,i)%particles(number_of_particles+1:new_size) = zero_particle
	1226
	1227	ELSE
	1228
	1229	ALLOCATE(tmp_particles_d(number_of_particles))
	1230	tmp_particles_d(1:number_of_particles) = grid_particles(k,j,i)%particles(1:number_of_particles)
	1231
	1232	DEALLOCATE(grid_particles(k,j,i)%particles)
	1233	ALLOCATE(grid_particles(k,j,i)%particles(new_size))
	1234
	1235	grid_particles(k,j,i)%particles(1:number_of_particles) = tmp_particles_d(1:number_of_particles)
	1236	grid_particles(k,j,i)%particles(number_of_particles+1:new_size) = zero_particle
	1237
	1238	DEALLOCATE(tmp_particles_d)
	1239
	1240	ENDIF
	1241
	1242	ENDIF
	1243	ENDDO
	1244	ENDDO
	1245	ENDDO
	1246
	1247	END SUBROUTINE dealloc_particles_array
	1248
	1249
[1359]	1250	END MODULE lpm_exchange_horiz_mod

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