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source: palm/trunk/SOURCE/lpm_exchange_horiz.f90 @ 2710

Last change on this file since 2710 was 2710, checked in by suehring, 6 years ago
changes documented
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File size: 51.3 KB

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[1873]	1	!> @file lpm_exchange_horiz.f90
[2000]	2	!------------------------------------------------------------------------------!
[2696]	3	! This file is part of the PALM model system.
[1036]	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	!
[2710]	23	!
[1930]	24	! Former revisions:
	25	! -----------------
	26	! $Id: lpm_exchange_horiz.f90 2710 2017-12-19 12:50:11Z suehring $
[2710]	27	! Bugfix in CFL check.
	28	! Further bugfix, non-allocated array used in case of 1D decomposition.
	29	!
	30	! 2709 2017-12-19 12:49:40Z suehring
[2632]	31	! Bugfix in write statement
	32	!
	33	! 2630 2017-11-20 12:58:20Z schwenkel
[2628]	34	! Enabled particle advection with grid stretching. Furthermore, the CFL-
	35	! criterion is checked for every particle at every time step.
	36	!
	37	! 2606 2017-11-10 10:36:31Z schwenkel
[2606]	38	! Changed particle box locations: center of particle box now coincides
	39	! with scalar grid point of same index.
	40	! lpm_move_particle now moves inner particles that would leave the core
	41	! to the respective boundary gridbox. Afterwards they get transferred by
	42	! lpm_exchange_horiz. This allows particles to move more than one gridbox
	43	! independent of domain composition.
	44	! Renamed module and subroutines: lpm_pack_arrays_mod -> lpm_pack_and_sort_mod
	45	! lpm_pack_all_arrays -> lpm_sort_in_subboxes, lpm_pack_arrays -> lpm_pack
	46	! lpm_sort -> lpm_sort_timeloop_done
	47	!
	48	! 2330 2017-08-03 14:26:02Z schwenkel
[2330]	49	! Bugfix: Also for gfortran compilable, function c_sizeof is not used.
	50	!
	51	! 2305 2017-07-06 11:18:47Z hoffmann
[2305]	52	! Improved calculation of particle IDs.
	53	!
	54	! 2245 2017-06-02 14:37:10Z schwenkel
[2245]	55	! Bugfix in Add_particles_to_gridcell:
	56	! Apply boundary conditions also in y-direction
	57	!
	58	! 2151 2017-02-15 10:42:16Z schwenkel
	59	! Bugfix in lpm_move_particle that prevents
	60	! false production of additional particles
[1930]	61	!
[2001]	62	! 2000 2016-08-20 18:09:15Z knoop
	63	! Forced header and separation lines into 80 columns
	64	!
[1937]	65	! 1936 2016-06-13 13:37:44Z suehring
	66	! Deallocation of unused memory
	67	!
[1930]	68	! 1929 2016-06-09 16:25:25Z suehring
[1929]	69	! Bugfixes:
	70	! - reallocation of new particles
	71	! ( did not work for small number of min_nr_particle )
	72	! - dynamical reallocation of north-south exchange arrays ( particles got lost )
	73	! - north-south exchange ( nr_move_north, nr_move_south were overwritten by zero )
	74	! - horizontal particle boundary conditions in serial mode
	75	!
	76	! Remove unused variables
	77	! Descriptions in variable declaration blocks added
[1321]	78	!
[1874]	79	! 1873 2016-04-18 14:50:06Z maronga
	80	! Module renamed (removed _mod)
	81	!
	82	!
[1851]	83	! 1850 2016-04-08 13:29:27Z maronga
	84	! Module renamed
	85	!
	86	!
[1823]	87	! 1822 2016-04-07 07:49:42Z hoffmann
	88	! Tails removed. Unused variables removed.
	89	!
[1784]	90	! 1783 2016-03-06 18:36:17Z raasch
	91	! new netcdf-module included
	92	!
[1692]	93	! 1691 2015-10-26 16:17:44Z maronga
	94	! Formatting corrections.
	95	!
[1686]	96	! 1685 2015-10-08 07:32:13Z raasch
	97	! bugfix concerning vertical index offset in case of ocean
	98	!
[1683]	99	! 1682 2015-10-07 23:56:08Z knoop
	100	! Code annotations made doxygen readable
	101	!
[1360]	102	! 1359 2014-04-11 17:15:14Z hoffmann
	103	! New particle structure integrated.
	104	! Kind definition added to all floating point numbers.
	105	!
[1329]	106	! 1327 2014-03-21 11:00:16Z raasch
	107	! -netcdf output queries
	108	!
[1321]	109	! 1320 2014-03-20 08:40:49Z raasch
[1320]	110	! ONLY-attribute added to USE-statements,
	111	! kind-parameters added to all INTEGER and REAL declaration statements,
	112	! kinds are defined in new module kinds,
	113	! comment fields (!:) to be used for variable explanations added to
	114	! all variable declaration statements
[849]	115	!
[1319]	116	! 1318 2014-03-17 13:35:16Z raasch
	117	! module interfaces removed
	118	!
[1037]	119	! 1036 2012-10-22 13:43:42Z raasch
	120	! code put under GPL (PALM 3.9)
	121	!
[852]	122	! 851 2012-03-15 14:32:58Z raasch
	123	! Bugfix: resetting of particle_mask and tail mask moved from end of this
	124	! routine to lpm
	125	!
[850]	126	! 849 2012-03-15 10:35:09Z raasch
	127	! initial revision (former part of advec_particles)
[849]	128	!
[850]	129	!
[849]	130	! Description:
	131	! ------------
[1822]	132	! Exchange of particles between the subdomains.
[849]	133	!------------------------------------------------------------------------------!
[1682]	134	MODULE lpm_exchange_horiz_mod
	135
[2305]	136	USE, INTRINSIC :: ISO_C_BINDING
[2628]	137
	138	USE arrays_3d, &
	139	ONLY: zw
	140
[1320]	141	USE control_parameters, &
[1783]	142	ONLY: dz, message_string, simulated_time
[1320]	143
	144	USE cpulog, &
	145	ONLY: cpu_log, log_point_s
	146
	147	USE grid_variables, &
	148	ONLY: ddx, ddy, dx, dy
	149
	150	USE indices, &
[1359]	151	ONLY: nx, nxl, nxr, ny, nyn, nys, nzb, nzt
[1320]	152
	153	USE kinds
	154
[2606]	155	USE lpm_pack_and_sort_mod, &
	156	ONLY: lpm_pack
[1359]	157
[1783]	158	USE netcdf_interface, &
	159	ONLY: netcdf_data_format
	160
[1320]	161	USE particle_attributes, &
[1822]	162	ONLY: alloc_factor, deleted_particles, grid_particles, &
	163	ibc_par_lr, ibc_par_ns, min_nr_particle, &
[2305]	164	number_of_particles, &
[1822]	165	offset_ocean_nzt, offset_ocean_nzt_m1, particles, &
	166	particle_type, prt_count, trlp_count_sum, &
[1359]	167	trlp_count_recv_sum, trnp_count_sum, trnp_count_recv_sum, &
	168	trrp_count_sum, trrp_count_recv_sum, trsp_count_sum, &
[1822]	169	trsp_count_recv_sum, zero_particle
[1320]	170
[849]	171	USE pegrid
	172
	173	IMPLICIT NONE
	174
[1682]	175	INTEGER(iwp), PARAMETER :: NR_2_direction_move = 10000 !<
	176	INTEGER(iwp) :: nr_move_north !<
	177	INTEGER(iwp) :: nr_move_south !<
[1359]	178
[1929]	179	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: move_also_north
	180	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: move_also_south
[1359]	181
	182	SAVE
	183
	184	PRIVATE
[1936]	185	PUBLIC lpm_exchange_horiz, lpm_move_particle, realloc_particles_array, &
	186	dealloc_particles_array
[1359]	187
	188	INTERFACE lpm_exchange_horiz
	189	MODULE PROCEDURE lpm_exchange_horiz
	190	END INTERFACE lpm_exchange_horiz
	191
	192	INTERFACE lpm_move_particle
	193	MODULE PROCEDURE lpm_move_particle
	194	END INTERFACE lpm_move_particle
	195
	196	INTERFACE realloc_particles_array
	197	MODULE PROCEDURE realloc_particles_array
	198	END INTERFACE realloc_particles_array
	199
[1936]	200	INTERFACE dealloc_particles_array
	201	MODULE PROCEDURE dealloc_particles_array
	202	END INTERFACE dealloc_particles_array
[1359]	203	CONTAINS
	204
[1682]	205	!------------------------------------------------------------------------------!
	206	! Description:
	207	! ------------
	208	!> Exchange between subdomains.
	209	!> As soon as one particle has moved beyond the boundary of the domain, it
	210	!> is included in the relevant transfer arrays and marked for subsequent
	211	!> deletion on this PE.
	212	!> First sweep for crossings in x direction. Find out first the number of
	213	!> particles to be transferred and allocate temporary arrays needed to store
	214	!> them.
	215	!> For a one-dimensional decomposition along y, no transfer is necessary,
	216	!> because the particle remains on the PE, but the particle coordinate has to
	217	!> be adjusted.
	218	!------------------------------------------------------------------------------!
[1359]	219	SUBROUTINE lpm_exchange_horiz
	220
	221	IMPLICIT NONE
	222
[1929]	223	INTEGER(iwp) :: i !< grid index (x) of particle positition
	224	INTEGER(iwp) :: ip !< index variable along x
	225	INTEGER(iwp) :: j !< grid index (y) of particle positition
	226	INTEGER(iwp) :: jp !< index variable along y
	227	INTEGER(iwp) :: kp !< index variable along z
	228	INTEGER(iwp) :: n !< particle index variable
[2305]	229	INTEGER(iwp) :: par_size !< Particle size in bytes
[1929]	230	INTEGER(iwp) :: trlp_count !< number of particles send to left PE
	231	INTEGER(iwp) :: trlp_count_recv !< number of particles receive from right PE
	232	INTEGER(iwp) :: trnp_count !< number of particles send to north PE
	233	INTEGER(iwp) :: trnp_count_recv !< number of particles receive from south PE
	234	INTEGER(iwp) :: trrp_count !< number of particles send to right PE
	235	INTEGER(iwp) :: trrp_count_recv !< number of particles receive from left PE
	236	INTEGER(iwp) :: trsp_count !< number of particles send to south PE
	237	INTEGER(iwp) :: trsp_count_recv !< number of particles receive from north PE
[849]	238
[1929]	239	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: rvlp !< particles received from right PE
	240	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: rvnp !< particles received from south PE
	241	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: rvrp !< particles received from left PE
	242	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: rvsp !< particles received from north PE
	243	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: trlp !< particles send to left PE
	244	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: trnp !< particles send to north PE
	245	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: trrp !< particles send to right PE
	246	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: trsp !< particles send to south PE
[849]	247
[1359]	248	CALL cpu_log( log_point_s(23), 'lpm_exchange_horiz', 'start' )
	249
[849]	250	#if defined( __parallel )
	251
[1822]	252	!
	253	!-- Exchange between subdomains.
	254	!-- As soon as one particle has moved beyond the boundary of the domain, it
	255	!-- is included in the relevant transfer arrays and marked for subsequent
	256	!-- deletion on this PE.
	257	!-- First sweep for crossings in x direction. Find out first the number of
	258	!-- particles to be transferred and allocate temporary arrays needed to store
	259	!-- them.
	260	!-- For a one-dimensional decomposition along y, no transfer is necessary,
	261	!-- because the particle remains on the PE, but the particle coordinate has to
	262	!-- be adjusted.
[849]	263	trlp_count = 0
	264	trrp_count = 0
	265
	266	trlp_count_recv = 0
	267	trrp_count_recv = 0
	268
	269	IF ( pdims(1) /= 1 ) THEN
	270	!
[1359]	271	!-- First calculate the storage necessary for sending and receiving the data.
	272	!-- Compute only first (nxl) and last (nxr) loop iterration.
	273	DO ip = nxl, nxr, nxr - nxl
	274	DO jp = nys, nyn
	275	DO kp = nzb+1, nzt
[849]	276
[1359]	277	number_of_particles = prt_count(kp,jp,ip)
	278	IF ( number_of_particles <= 0 ) CYCLE
	279	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	280	DO n = 1, number_of_particles
	281	IF ( particles(n)%particle_mask ) THEN
[2606]	282	i = particles(n)%x * ddx
[1929]	283	!
	284	!-- Above calculation does not work for indices less than zero
[2606]	285	IF ( particles(n)%x < 0.0_wp) i = -1
[1359]	286
	287	IF ( i < nxl ) THEN
	288	trlp_count = trlp_count + 1
	289	ELSEIF ( i > nxr ) THEN
	290	trrp_count = trrp_count + 1
	291	ENDIF
	292	ENDIF
	293	ENDDO
	294
	295	ENDDO
	296	ENDDO
[849]	297	ENDDO
	298
	299	IF ( trlp_count == 0 ) trlp_count = 1
	300	IF ( trrp_count == 0 ) trrp_count = 1
	301
	302	ALLOCATE( trlp(trlp_count), trrp(trrp_count) )
	303
[1359]	304	trlp = zero_particle
	305	trrp = zero_particle
[849]	306
	307	trlp_count = 0
	308	trrp_count = 0
	309
	310	ENDIF
[1359]	311	!
	312	!-- Compute only first (nxl) and last (nxr) loop iterration
[1929]	313	DO ip = nxl, nxr, nxr-nxl
[1359]	314	DO jp = nys, nyn
	315	DO kp = nzb+1, nzt
	316	number_of_particles = prt_count(kp,jp,ip)
	317	IF ( number_of_particles <= 0 ) CYCLE
	318	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	319	DO n = 1, number_of_particles
	320	!
	321	!-- Only those particles that have not been marked as 'deleted' may
	322	!-- be moved.
	323	IF ( particles(n)%particle_mask ) THEN
[849]	324
[2606]	325	i = particles(n)%x * ddx
[1929]	326	!
	327	!-- Above calculation does not work for indices less than zero
[2606]	328	IF ( particles(n)%x < 0.0_wp ) i = -1
[849]	329
[1359]	330	IF ( i < nxl ) THEN
	331	IF ( i < 0 ) THEN
[1929]	332	!
	333	!-- Apply boundary condition along x
[1359]	334	IF ( ibc_par_lr == 0 ) THEN
[1929]	335	!
	336	!-- Cyclic condition
[1359]	337	IF ( pdims(1) == 1 ) THEN
	338	particles(n)%x = ( nx + 1 ) * dx + particles(n)%x
	339	particles(n)%origin_x = ( nx + 1 ) * dx + &
	340	particles(n)%origin_x
	341	ELSE
	342	trlp_count = trlp_count + 1
	343	trlp(trlp_count) = particles(n)
	344	trlp(trlp_count)%x = ( nx + 1 ) * dx + trlp(trlp_count)%x
	345	trlp(trlp_count)%origin_x = trlp(trlp_count)%origin_x + &
	346	( nx + 1 ) * dx
	347	particles(n)%particle_mask = .FALSE.
	348	deleted_particles = deleted_particles + 1
[849]	349
[2606]	350	IF ( trlp(trlp_count)%x >= (nx + 1)* dx - 1.0E-12_wp ) THEN
[1359]	351	trlp(trlp_count)%x = trlp(trlp_count)%x - 1.0E-10_wp
	352	!++ why is 1 subtracted in next statement???
	353	trlp(trlp_count)%origin_x = trlp(trlp_count)%origin_x - 1
	354	ENDIF
[849]	355
[1359]	356	ENDIF
[849]	357
[1359]	358	ELSEIF ( ibc_par_lr == 1 ) THEN
[1929]	359	!
	360	!-- Particle absorption
[1359]	361	particles(n)%particle_mask = .FALSE.
	362	deleted_particles = deleted_particles + 1
[849]	363
[1359]	364	ELSEIF ( ibc_par_lr == 2 ) THEN
[1929]	365	!
	366	!-- Particle reflection
[1359]	367	particles(n)%x = -particles(n)%x
	368	particles(n)%speed_x = -particles(n)%speed_x
[849]	369
[1359]	370	ENDIF
	371	ELSE
[1929]	372	!
	373	!-- Store particle data in the transfer array, which will be
	374	!-- send to the neighbouring PE
[1359]	375	trlp_count = trlp_count + 1
	376	trlp(trlp_count) = particles(n)
	377	particles(n)%particle_mask = .FALSE.
	378	deleted_particles = deleted_particles + 1
[849]	379
[1359]	380	ENDIF
[849]	381
[1359]	382	ELSEIF ( i > nxr ) THEN
	383	IF ( i > nx ) THEN
[1929]	384	!
	385	!-- Apply boundary condition along x
[1359]	386	IF ( ibc_par_lr == 0 ) THEN
[1929]	387	!
	388	!-- Cyclic condition
[1359]	389	IF ( pdims(1) == 1 ) THEN
	390	particles(n)%x = particles(n)%x - ( nx + 1 ) * dx
	391	particles(n)%origin_x = particles(n)%origin_x - &
	392	( nx + 1 ) * dx
	393	ELSE
	394	trrp_count = trrp_count + 1
	395	trrp(trrp_count) = particles(n)
	396	trrp(trrp_count)%x = trrp(trrp_count)%x - ( nx + 1 ) * dx
	397	trrp(trrp_count)%origin_x = trrp(trrp_count)%origin_x - &
	398	( nx + 1 ) * dx
	399	particles(n)%particle_mask = .FALSE.
	400	deleted_particles = deleted_particles + 1
[849]	401
[1359]	402	ENDIF
[849]	403
[1359]	404	ELSEIF ( ibc_par_lr == 1 ) THEN
[1929]	405	!
	406	!-- Particle absorption
[1359]	407	particles(n)%particle_mask = .FALSE.
	408	deleted_particles = deleted_particles + 1
[849]	409
[1359]	410	ELSEIF ( ibc_par_lr == 2 ) THEN
[1929]	411	!
	412	!-- Particle reflection
[1359]	413	particles(n)%x = 2 * ( nx * dx ) - particles(n)%x
	414	particles(n)%speed_x = -particles(n)%speed_x
[849]	415
[1359]	416	ENDIF
	417	ELSE
[1929]	418	!
	419	!-- Store particle data in the transfer array, which will be send
	420	!-- to the neighbouring PE
[1359]	421	trrp_count = trrp_count + 1
	422	trrp(trrp_count) = particles(n)
	423	particles(n)%particle_mask = .FALSE.
	424	deleted_particles = deleted_particles + 1
[849]	425
[1359]	426	ENDIF
[849]	427
[1359]	428	ENDIF
	429	ENDIF
[1929]	430
[1359]	431	ENDDO
	432	ENDDO
	433	ENDDO
[849]	434	ENDDO
	435
[2330]	436	#if defined( __gfortran )
[849]	437	!
[2330]	438	!-- For the gfortran compiler the function c_sizeof produces strange erros
	439	!-- which can probably be attributed to an error in the gfortran compiler.
	440	!-- Therefore the particle size in bytes is set manually. Attention: A
	441	!-- change of the size of the particle type requires an adjustment of
	442	!-- this value
	443	par_size = 184
	444	#else
	445	!
	446	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
[2709]	447	!-- variables in structure particle_type (due to the calculation of par_size).
	448	!-- Please note, in case of 1D decomposition ( only 1 core along
	449	!-- x dimension), array trlp is not allocated, leading to program crash.
	450	!-- Hence, check if array is allocated and allocate it temporarily if
	451	!-- if required.
	452	IF ( .NOT. ALLOCATED( trlp ) ) ALLOCATE( trlp(1:1) )
	453
[2330]	454	par_size = c_sizeof(trlp(1))
	455	#endif
	456
	457
	458	!
[1929]	459	!-- Allocate arrays required for north-south exchange, as these
	460	!-- are used directly after particles are exchange along x-direction.
	461	ALLOCATE( move_also_north(1:NR_2_direction_move) )
	462	ALLOCATE( move_also_south(1:NR_2_direction_move) )
	463
	464	nr_move_north = 0
	465	nr_move_south = 0
	466	!
[849]	467	!-- Send left boundary, receive right boundary (but first exchange how many
	468	!-- and check, if particle storage must be extended)
	469	IF ( pdims(1) /= 1 ) THEN
	470
	471	CALL MPI_SENDRECV( trlp_count, 1, MPI_INTEGER, pleft, 0, &
	472	trrp_count_recv, 1, MPI_INTEGER, pright, 0, &
	473	comm2d, status, ierr )
	474
[1359]	475	ALLOCATE(rvrp(MAX(1,trrp_count_recv)))
[2330]	476
[2305]	477	CALL MPI_SENDRECV( trlp, max(1,trlp_count)*par_size, MPI_BYTE,&
	478	pleft, 1, rvrp, &
	479	max(1,trrp_count_recv)*par_size, MPI_BYTE, pright, 1,&
[849]	480	comm2d, status, ierr )
	481
[1359]	482	IF ( trrp_count_recv > 0 ) CALL Add_particles_to_gridcell(rvrp(1:trrp_count_recv))
	483
	484	DEALLOCATE(rvrp)
	485
[849]	486	!
	487	!-- Send right boundary, receive left boundary
	488	CALL MPI_SENDRECV( trrp_count, 1, MPI_INTEGER, pright, 0, &
	489	trlp_count_recv, 1, MPI_INTEGER, pleft, 0, &
	490	comm2d, status, ierr )
	491
[1359]	492	ALLOCATE(rvlp(MAX(1,trlp_count_recv)))
[2305]	493	!
	494	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
	495	!-- variables in structure particle_type (due to the calculation of par_size)
	496	CALL MPI_SENDRECV( trrp, max(1,trrp_count)*par_size, MPI_BYTE,&
	497	pright, 1, rvlp, &
	498	max(1,trlp_count_recv)*par_size, MPI_BYTE, pleft, 1, &
[849]	499	comm2d, status, ierr )
	500
[1359]	501	IF ( trlp_count_recv > 0 ) CALL Add_particles_to_gridcell(rvlp(1:trlp_count_recv))
	502
[1822]	503	DEALLOCATE( rvlp )
[1359]	504	DEALLOCATE( trlp, trrp )
[849]	505
	506	ENDIF
	507
	508	!
	509	!-- Check whether particles have crossed the boundaries in y direction. Note
	510	!-- that this case can also apply to particles that have just been received
	511	!-- from the adjacent right or left PE.
	512	!-- Find out first the number of particles to be transferred and allocate
	513	!-- temporary arrays needed to store them.
[1929]	514	!-- For a one-dimensional decomposition along y, no transfer is necessary,
[849]	515	!-- because the particle remains on the PE.
[1359]	516	trsp_count = nr_move_south
	517	trnp_count = nr_move_north
[849]	518
	519	trsp_count_recv = 0
	520	trnp_count_recv = 0
	521
	522	IF ( pdims(2) /= 1 ) THEN
	523	!
	524	!-- First calculate the storage necessary for sending and receiving the
	525	!-- data
[1359]	526	DO ip = nxl, nxr
[1929]	527	DO jp = nys, nyn, nyn-nys !compute only first (nys) and last (nyn) loop iterration
[1359]	528	DO kp = nzb+1, nzt
	529	number_of_particles = prt_count(kp,jp,ip)
	530	IF ( number_of_particles <= 0 ) CYCLE
	531	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	532	DO n = 1, number_of_particles
	533	IF ( particles(n)%particle_mask ) THEN
[2606]	534	j = particles(n)%y * ddy
[849]	535	!
[1359]	536	!-- Above calculation does not work for indices less than zero
[2606]	537	IF ( particles(n)%y < 0.0_wp) j = -1
[849]	538
[1359]	539	IF ( j < nys ) THEN
	540	trsp_count = trsp_count + 1
	541	ELSEIF ( j > nyn ) THEN
	542	trnp_count = trnp_count + 1
	543	ENDIF
	544	ENDIF
	545	ENDDO
	546	ENDDO
	547	ENDDO
[849]	548	ENDDO
	549
	550	IF ( trsp_count == 0 ) trsp_count = 1
	551	IF ( trnp_count == 0 ) trnp_count = 1
	552
	553	ALLOCATE( trsp(trsp_count), trnp(trnp_count) )
	554
[1359]	555	trsp = zero_particle
	556	trnp = zero_particle
[849]	557
[1359]	558	trsp_count = nr_move_south
	559	trnp_count = nr_move_north
[1929]	560
[1359]	561	trsp(1:nr_move_south) = move_also_south(1:nr_move_south)
	562	trnp(1:nr_move_north) = move_also_north(1:nr_move_north)
	563
[849]	564	ENDIF
	565
[1359]	566	DO ip = nxl, nxr
	567	DO jp = nys, nyn, nyn-nys ! compute only first (nys) and last (nyn) loop iterration
	568	DO kp = nzb+1, nzt
	569	number_of_particles = prt_count(kp,jp,ip)
	570	IF ( number_of_particles <= 0 ) CYCLE
	571	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	572	DO n = 1, number_of_particles
[849]	573	!
[1359]	574	!-- Only those particles that have not been marked as 'deleted' may
	575	!-- be moved.
	576	IF ( particles(n)%particle_mask ) THEN
[1929]	577
[2606]	578	j = particles(n)%y * ddy
[849]	579	!
[1359]	580	!-- Above calculation does not work for indices less than zero
[2606]	581	IF ( particles(n)%y < 0.0_wp ) j = -1
[849]	582
[1359]	583	IF ( j < nys ) THEN
	584	IF ( j < 0 ) THEN
[849]	585	!
[1359]	586	!-- Apply boundary condition along y
	587	IF ( ibc_par_ns == 0 ) THEN
[849]	588	!
[1359]	589	!-- Cyclic condition
	590	IF ( pdims(2) == 1 ) THEN
	591	particles(n)%y = ( ny + 1 ) * dy + particles(n)%y
	592	particles(n)%origin_y = ( ny + 1 ) * dy + &
[1929]	593	particles(n)%origin_y
[1359]	594	ELSE
[1929]	595	trsp_count = trsp_count + 1
	596	trsp(trsp_count) = particles(n)
[1359]	597	trsp(trsp_count)%y = ( ny + 1 ) * dy + &
[1929]	598	trsp(trsp_count)%y
[1359]	599	trsp(trsp_count)%origin_y = trsp(trsp_count)%origin_y &
[1929]	600	+ ( ny + 1 ) * dy
[1359]	601	particles(n)%particle_mask = .FALSE.
	602	deleted_particles = deleted_particles + 1
[849]	603
[2606]	604	IF ( trsp(trsp_count)%y >= (ny+1)* dy - 1.0E-12_wp ) THEN
[1359]	605	trsp(trsp_count)%y = trsp(trsp_count)%y - 1.0E-10_wp
	606	!++ why is 1 subtracted in next statement???
	607	trsp(trsp_count)%origin_y = &
[1929]	608	trsp(trsp_count)%origin_y - 1
[1359]	609	ENDIF
[849]	610
[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.
[1929]	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 = -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	trsp_count = trsp_count + 1
	631	trsp(trsp_count) = particles(n)
	632	particles(n)%particle_mask = .FALSE.
	633	deleted_particles = deleted_particles + 1
[849]	634
[1359]	635	ENDIF
[849]	636
[1359]	637	ELSEIF ( j > nyn ) THEN
	638	IF ( j > ny ) THEN
[849]	639	!
[1929]	640	!-- Apply boundary condition along y
[1359]	641	IF ( ibc_par_ns == 0 ) THEN
[849]	642	!
[1359]	643	!-- Cyclic condition
	644	IF ( pdims(2) == 1 ) THEN
[1929]	645	particles(n)%y = particles(n)%y - ( ny + 1 ) * dy
[1359]	646	particles(n)%origin_y = &
[1929]	647	particles(n)%origin_y - ( ny + 1 ) * dy
[1359]	648	ELSE
[1929]	649	trnp_count = trnp_count + 1
	650	trnp(trnp_count) = particles(n)
[1359]	651	trnp(trnp_count)%y = &
[1929]	652	trnp(trnp_count)%y - ( ny + 1 ) * dy
[1359]	653	trnp(trnp_count)%origin_y = &
[1929]	654	trnp(trnp_count)%origin_y - ( ny + 1 ) * dy
[1359]	655	particles(n)%particle_mask = .FALSE.
[1929]	656	deleted_particles = deleted_particles + 1
[1359]	657	ENDIF
[849]	658
[1359]	659	ELSEIF ( ibc_par_ns == 1 ) THEN
[849]	660	!
[1359]	661	!-- Particle absorption
	662	particles(n)%particle_mask = .FALSE.
	663	deleted_particles = deleted_particles + 1
[849]	664
[1359]	665	ELSEIF ( ibc_par_ns == 2 ) THEN
[849]	666	!
[1359]	667	!-- Particle reflection
	668	particles(n)%y = 2 * ( ny * dy ) - particles(n)%y
	669	particles(n)%speed_y = -particles(n)%speed_y
[849]	670
[1359]	671	ENDIF
	672	ELSE
[849]	673	!
[1359]	674	!-- Store particle data in the transfer array, which will
	675	!-- be send to the neighbouring PE
	676	trnp_count = trnp_count + 1
	677	trnp(trnp_count) = particles(n)
	678	particles(n)%particle_mask = .FALSE.
	679	deleted_particles = deleted_particles + 1
[849]	680
[1359]	681	ENDIF
	682
	683	ENDIF
[849]	684	ENDIF
[1359]	685	ENDDO
	686	ENDDO
	687	ENDDO
[849]	688	ENDDO
	689
	690	!
	691	!-- Send front boundary, receive back boundary (but first exchange how many
	692	!-- and check, if particle storage must be extended)
	693	IF ( pdims(2) /= 1 ) THEN
	694
	695	CALL MPI_SENDRECV( trsp_count, 1, MPI_INTEGER, psouth, 0, &
	696	trnp_count_recv, 1, MPI_INTEGER, pnorth, 0, &
	697	comm2d, status, ierr )
	698
[1359]	699	ALLOCATE(rvnp(MAX(1,trnp_count_recv)))
[2305]	700	!
	701	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
	702	!-- variables in structure particle_type (due to the calculation of par_size)
	703	CALL MPI_SENDRECV( trsp, trsp_count*par_size, MPI_BYTE, &
	704	psouth, 1, rvnp, &
	705	trnp_count_recv*par_size, MPI_BYTE, pnorth, 1, &
[849]	706	comm2d, status, ierr )
	707
[1359]	708	IF ( trnp_count_recv > 0 ) CALL Add_particles_to_gridcell(rvnp(1:trnp_count_recv))
	709
	710	DEALLOCATE(rvnp)
	711
[849]	712	!
	713	!-- Send back boundary, receive front boundary
	714	CALL MPI_SENDRECV( trnp_count, 1, MPI_INTEGER, pnorth, 0, &
	715	trsp_count_recv, 1, MPI_INTEGER, psouth, 0, &
	716	comm2d, status, ierr )
	717
[1359]	718	ALLOCATE(rvsp(MAX(1,trsp_count_recv)))
[2305]	719	!
	720	!-- This MPI_SENDRECV should work even with odd mixture on 32 and 64 Bit
	721	!-- variables in structure particle_type (due to the calculation of par_size)
	722	CALL MPI_SENDRECV( trnp, trnp_count*par_size, MPI_BYTE, &
	723	pnorth, 1, rvsp, &
	724	trsp_count_recv*par_size, MPI_BYTE, psouth, 1, &
[849]	725	comm2d, status, ierr )
	726
[1359]	727	IF ( trsp_count_recv > 0 ) CALL Add_particles_to_gridcell(rvsp(1:trsp_count_recv))
	728
	729	DEALLOCATE(rvsp)
	730
[849]	731	number_of_particles = number_of_particles + trsp_count_recv
	732
	733	DEALLOCATE( trsp, trnp )
	734
	735	ENDIF
	736
[1929]	737	DEALLOCATE( move_also_north )
	738	DEALLOCATE( move_also_south )
	739
[849]	740	#else
	741
[1929]	742	DO ip = nxl, nxr, nxr-nxl
	743	DO jp = nys, nyn
	744	DO kp = nzb+1, nzt
	745	number_of_particles = prt_count(kp,jp,ip)
	746	IF ( number_of_particles <= 0 ) CYCLE
	747	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	748	DO n = 1, number_of_particles
[849]	749	!
[1929]	750	!-- Apply boundary conditions
[849]	751
[2606]	752	IF ( particles(n)%x < 0.0_wp ) THEN
[849]	753
[1929]	754	IF ( ibc_par_lr == 0 ) THEN
[849]	755	!
[1929]	756	!-- Cyclic boundary. Relevant coordinate has to be changed.
	757	particles(n)%x = ( nx + 1 ) * dx + particles(n)%x
[2606]	758	particles(n)%origin_x = ( nx + 1 ) * dx + &
	759	particles(n)%origin_x
[1929]	760	ELSEIF ( ibc_par_lr == 1 ) THEN
[849]	761	!
[1929]	762	!-- Particle absorption
	763	particles(n)%particle_mask = .FALSE.
	764	deleted_particles = deleted_particles + 1
[1822]	765
[1929]	766	ELSEIF ( ibc_par_lr == 2 ) THEN
[849]	767	!
[1929]	768	!-- Particle reflection
	769	particles(n)%x = -dx - particles(n)%x
	770	particles(n)%speed_x = -particles(n)%speed_x
	771	ENDIF
[849]	772
[2606]	773	ELSEIF ( particles(n)%x >= ( nx + 1) * dx ) THEN
[849]	774
[1929]	775	IF ( ibc_par_lr == 0 ) THEN
[849]	776	!
[1929]	777	!-- Cyclic boundary. Relevant coordinate has to be changed.
	778	particles(n)%x = particles(n)%x - ( nx + 1 ) * dx
[2606]	779	particles(n)%origin_x = particles(n)%origin_x - &
	780	( nx + 1 ) * dx
[1822]	781
[1929]	782	ELSEIF ( ibc_par_lr == 1 ) THEN
[849]	783	!
[1929]	784	!-- Particle absorption
	785	particles(n)%particle_mask = .FALSE.
	786	deleted_particles = deleted_particles + 1
[1822]	787
[1929]	788	ELSEIF ( ibc_par_lr == 2 ) THEN
[849]	789	!
[1929]	790	!-- Particle reflection
	791	particles(n)%x = ( nx + 1 ) * dx - particles(n)%x
	792	particles(n)%speed_x = -particles(n)%speed_x
	793	ENDIF
[849]	794
[1929]	795	ENDIF
	796	ENDDO
	797	ENDDO
	798	ENDDO
	799	ENDDO
[849]	800
[1929]	801	DO ip = nxl, nxr
	802	DO jp = nys, nyn, nyn-nys
	803	DO kp = nzb+1, nzt
	804	number_of_particles = prt_count(kp,jp,ip)
	805	IF ( number_of_particles <= 0 ) CYCLE
	806	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	807	DO n = 1, number_of_particles
[849]	808
[2606]	809	IF ( particles(n)%y < 0.0_wp) THEN
[1929]	810
	811	IF ( ibc_par_ns == 0 ) THEN
[849]	812	!
[1929]	813	!-- Cyclic boundary. Relevant coordinate has to be changed.
	814	particles(n)%y = ( ny + 1 ) * dy + particles(n)%y
[2606]	815	particles(n)%origin_y = ( ny + 1 ) * dy + &
	816	particles(n)%origin_y
[1822]	817
[1929]	818	ELSEIF ( ibc_par_ns == 1 ) THEN
[849]	819	!
[1929]	820	!-- Particle absorption
	821	particles(n)%particle_mask = .FALSE.
	822	deleted_particles = deleted_particles + 1
[1822]	823
[1929]	824	ELSEIF ( ibc_par_ns == 2 ) THEN
[849]	825	!
[1929]	826	!-- Particle reflection
	827	particles(n)%y = -dy - particles(n)%y
	828	particles(n)%speed_y = -particles(n)%speed_y
	829	ENDIF
[849]	830
[2606]	831	ELSEIF ( particles(n)%y >= ( ny + 1) * dy ) THEN
[849]	832
[1929]	833	IF ( ibc_par_ns == 0 ) THEN
[849]	834	!
[1929]	835	!-- Cyclic boundary. Relevant coordinate has to be changed.
	836	particles(n)%y = particles(n)%y - ( ny + 1 ) * dy
[2606]	837	particles(n)%origin_y = particles(n)%origin_y - &
	838	( ny + 1 ) * dy
[1822]	839
[1929]	840	ELSEIF ( ibc_par_ns == 1 ) THEN
[849]	841	!
[1929]	842	!-- Particle absorption
	843	particles(n)%particle_mask = .FALSE.
	844	deleted_particles = deleted_particles + 1
[1822]	845
[1929]	846	ELSEIF ( ibc_par_ns == 2 ) THEN
[849]	847	!
[1929]	848	!-- Particle reflection
	849	particles(n)%y = ( ny + 1 ) * dy - particles(n)%y
	850	particles(n)%speed_y = -particles(n)%speed_y
	851	ENDIF
[849]	852
[1929]	853	ENDIF
	854
	855	ENDDO
	856	ENDDO
	857	ENDDO
[849]	858	ENDDO
	859	#endif
	860
	861	!
	862	!-- Accumulate the number of particles transferred between the subdomains
	863	#if defined( __parallel )
	864	trlp_count_sum = trlp_count_sum + trlp_count
	865	trlp_count_recv_sum = trlp_count_recv_sum + trlp_count_recv
	866	trrp_count_sum = trrp_count_sum + trrp_count
	867	trrp_count_recv_sum = trrp_count_recv_sum + trrp_count_recv
	868	trsp_count_sum = trsp_count_sum + trsp_count
	869	trsp_count_recv_sum = trsp_count_recv_sum + trsp_count_recv
	870	trnp_count_sum = trnp_count_sum + trnp_count
	871	trnp_count_recv_sum = trnp_count_recv_sum + trnp_count_recv
	872	#endif
	873
[1359]	874	CALL cpu_log( log_point_s(23), 'lpm_exchange_horiz', 'stop' )
[849]	875
	876	END SUBROUTINE lpm_exchange_horiz
[1359]	877
[1682]	878	!------------------------------------------------------------------------------!
	879	! Description:
	880	! ------------
	881	!> If a particle moves from one processor to another, this subroutine moves
	882	!> the corresponding elements from the particle arrays of the old grid cells
	883	!> to the particle arrays of the new grid cells.
	884	!------------------------------------------------------------------------------!
[1359]	885	SUBROUTINE Add_particles_to_gridcell (particle_array)
	886
	887	IMPLICIT NONE
	888
[1929]	889	INTEGER(iwp) :: ip !< grid index (x) of particle
	890	INTEGER(iwp) :: jp !< grid index (x) of particle
	891	INTEGER(iwp) :: kp !< grid index (x) of particle
	892	INTEGER(iwp) :: n !< index variable of particle
	893	INTEGER(iwp) :: pindex !< dummy argument for new number of particles per grid box
[1359]	894
[1682]	895	LOGICAL :: pack_done !<
[1359]	896
[1929]	897	TYPE(particle_type), DIMENSION(:), INTENT(IN) :: particle_array !< new particles in a grid box
	898	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: temp_ns !< temporary particle array for reallocation
[1359]	899
	900	pack_done = .FALSE.
	901
[1929]	902	DO n = 1, SIZE(particle_array)
[1359]	903
[1929]	904	IF ( .NOT. particle_array(n)%particle_mask ) CYCLE
	905
[2606]	906	ip = particle_array(n)%x * ddx
	907	jp = particle_array(n)%y * ddy
	908	kp = particle_array(n)%z / dz + 1 + offset_ocean_nzt
[2628]	909	!
	910	!-- In case of grid stretching a particle might be above or below the
	911	!-- previously calculated particle grid box (indices).
	912	DO WHILE( zw(kp) < particle_array(n)%z )
	913	kp = kp + 1
	914	ENDDO
[1359]	915
[2628]	916	DO WHILE( zw(kp-1) > particle_array(n)%z )
	917	kp = kp - 1
	918	ENDDO
	919
[1359]	920	IF ( ip >= nxl .AND. ip <= nxr .AND. jp >= nys .AND. jp <= nyn &
	921	.AND. kp >= nzb+1 .AND. kp <= nzt) THEN ! particle stays on processor
	922	number_of_particles = prt_count(kp,jp,ip)
	923	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
	924
	925	pindex = prt_count(kp,jp,ip)+1
	926	IF( pindex > SIZE(grid_particles(kp,jp,ip)%particles) ) THEN
	927	IF ( pack_done ) THEN
	928	CALL realloc_particles_array (ip,jp,kp)
	929	ELSE
[2606]	930	CALL lpm_pack
[1359]	931	prt_count(kp,jp,ip) = number_of_particles
	932	pindex = prt_count(kp,jp,ip)+1
	933	IF ( pindex > SIZE(grid_particles(kp,jp,ip)%particles) ) THEN
	934	CALL realloc_particles_array (ip,jp,kp)
	935	ENDIF
	936	pack_done = .TRUE.
	937	ENDIF
	938	ENDIF
	939	grid_particles(kp,jp,ip)%particles(pindex) = particle_array(n)
	940	prt_count(kp,jp,ip) = pindex
	941	ELSE
[1929]	942	IF ( jp <= nys - 1 ) THEN
[1359]	943	nr_move_south = nr_move_south+1
[1929]	944	!
	945	!-- Before particle information is swapped to exchange-array, check
	946	!-- if enough memory is allocated. If required, reallocate exchange
	947	!-- array.
	948	IF ( nr_move_south > SIZE(move_also_south) ) THEN
	949	!
	950	!-- At first, allocate further temporary array to swap particle
	951	!-- information.
	952	ALLOCATE( temp_ns(SIZE(move_also_south)+NR_2_direction_move) )
	953	temp_ns(1:nr_move_south-1) = move_also_south(1:nr_move_south-1)
	954	DEALLOCATE( move_also_south )
	955	ALLOCATE( move_also_south(SIZE(temp_ns)) )
	956	move_also_south(1:nr_move_south-1) = temp_ns(1:nr_move_south-1)
	957	DEALLOCATE( temp_ns )
	958
	959	ENDIF
	960
[1359]	961	move_also_south(nr_move_south) = particle_array(n)
[1929]	962
[1359]	963	IF ( jp == -1 ) THEN
[2245]	964	!
	965	!-- Apply boundary condition along y
	966	IF ( ibc_par_ns == 0 ) THEN
	967	move_also_south(nr_move_south)%y = &
	968	move_also_south(nr_move_south)%y + ( ny + 1 ) * dy
	969	move_also_south(nr_move_south)%origin_y = &
	970	move_also_south(nr_move_south)%origin_y + ( ny + 1 ) * dy
	971	ELSEIF ( ibc_par_ns == 1 ) THEN
	972	!
	973	!-- Particle absorption
	974	move_also_south(nr_move_south)%particle_mask = .FALSE.
	975	deleted_particles = deleted_particles + 1
	976
	977	ELSEIF ( ibc_par_ns == 2 ) THEN
	978	!
	979	!-- Particle reflection
	980	move_also_south(nr_move_south)%y = &
	981	-move_also_south(nr_move_south)%y
	982	move_also_south(nr_move_south)%speed_y = &
	983	-move_also_south(nr_move_south)%speed_y
	984
	985	ENDIF
[1359]	986	ENDIF
[1929]	987	ELSEIF ( jp >= nyn+1 ) THEN
[1359]	988	nr_move_north = nr_move_north+1
[1929]	989	!
	990	!-- Before particle information is swapped to exchange-array, check
	991	!-- if enough memory is allocated. If required, reallocate exchange
	992	!-- array.
	993	IF ( nr_move_north > SIZE(move_also_north) ) THEN
	994	!
	995	!-- At first, allocate further temporary array to swap particle
	996	!-- information.
	997	ALLOCATE( temp_ns(SIZE(move_also_north)+NR_2_direction_move) )
	998	temp_ns(1:nr_move_north-1) = move_also_south(1:nr_move_north-1)
	999	DEALLOCATE( move_also_north )
	1000	ALLOCATE( move_also_north(SIZE(temp_ns)) )
	1001	move_also_north(1:nr_move_north-1) = temp_ns(1:nr_move_north-1)
	1002	DEALLOCATE( temp_ns )
	1003
	1004	ENDIF
	1005
[1359]	1006	move_also_north(nr_move_north) = particle_array(n)
	1007	IF ( jp == ny+1 ) THEN
[2245]	1008	!
	1009	!-- Apply boundary condition along y
	1010	IF ( ibc_par_ns == 0 ) THEN
	1011
	1012	move_also_north(nr_move_north)%y = &
	1013	move_also_north(nr_move_north)%y - ( ny + 1 ) * dy
	1014	move_also_north(nr_move_north)%origin_y = &
	1015	move_also_north(nr_move_north)%origin_y - ( ny + 1 ) * dy
	1016	ELSEIF ( ibc_par_ns == 1 ) THEN
	1017	!
	1018	!-- Particle absorption
	1019	move_also_north(nr_move_north)%particle_mask = .FALSE.
	1020	deleted_particles = deleted_particles + 1
	1021
	1022	ELSEIF ( ibc_par_ns == 2 ) THEN
	1023	!
	1024	!-- Particle reflection
	1025	move_also_north(nr_move_north)%y = &
	1026	-move_also_north(nr_move_north)%y
	1027	move_also_north(nr_move_north)%speed_y = &
	1028	-move_also_north(nr_move_north)%speed_y
	1029
	1030	ENDIF
[1359]	1031	ENDIF
	1032	ELSE
	1033	WRITE(0,'(a,8i7)') 'particle out of range ',myid,ip,jp,kp,nxl,nxr,nys,nyn
	1034	ENDIF
	1035	ENDIF
	1036	ENDDO
	1037
	1038	RETURN
	1039
	1040	END SUBROUTINE Add_particles_to_gridcell
	1041
	1042
	1043
	1044
[1682]	1045	!------------------------------------------------------------------------------!
	1046	! Description:
	1047	! ------------
	1048	!> If a particle moves from one grid cell to another (on the current
	1049	!> processor!), this subroutine moves the corresponding element from the
	1050	!> particle array of the old grid cell to the particle array of the new grid
	1051	!> cell.
	1052	!------------------------------------------------------------------------------!
[1359]	1053	SUBROUTINE lpm_move_particle
[2628]	1054
[1359]	1055	IMPLICIT NONE
	1056
[1929]	1057	INTEGER(iwp) :: i !< grid index (x) of particle position
	1058	INTEGER(iwp) :: ip !< index variable along x
	1059	INTEGER(iwp) :: j !< grid index (y) of particle position
	1060	INTEGER(iwp) :: jp !< index variable along y
	1061	INTEGER(iwp) :: k !< grid index (z) of particle position
	1062	INTEGER(iwp) :: kp !< index variable along z
	1063	INTEGER(iwp) :: n !< index variable for particle array
[2606]	1064	INTEGER(iwp) :: np_before_move !< number of particles per grid box before moving
[1929]	1065	INTEGER(iwp) :: pindex !< dummy argument for number of new particle per grid box
[1359]	1066
[2606]	1067	TYPE(particle_type), DIMENSION(:), POINTER :: particles_before_move !< particles before moving
[1359]	1068
	1069	CALL cpu_log( log_point_s(41), 'lpm_move_particle', 'start' )
[2628]	1070	CALL lpm_check_cfl
[1359]	1071	DO ip = nxl, nxr
	1072	DO jp = nys, nyn
	1073	DO kp = nzb+1, nzt
	1074
[2606]	1075	np_before_move = prt_count(kp,jp,ip)
	1076	IF ( np_before_move <= 0 ) CYCLE
	1077	particles_before_move => grid_particles(kp,jp,ip)%particles(1:np_before_move)
[1359]	1078
[2606]	1079	DO n = 1, np_before_move
	1080	i = particles_before_move(n)%x * ddx
	1081	j = particles_before_move(n)%y * ddy
[2628]	1082	k = kp
	1083	!
	1084	!-- Find correct vertical particle grid box (necessary in case of grid stretching)
	1085	!-- Due to the CFL limitations only the neighbouring grid boxes are considered.
	1086	IF( zw(k) < particles_before_move(n)%z ) k = k + 1
	1087	IF( zw(k-1) > particles_before_move(n)%z ) k = k - 1
	1088
[2606]	1089	!-- For lpm_exchange_horiz to work properly particles need to be moved to the outermost gridboxes
	1090	!-- of the respective processor. If the particle index is inside the processor the following lines
	1091	!-- will not change the index
	1092	i = MIN ( i , nxr )
	1093	i = MAX ( i , nxl )
	1094	j = MIN ( j , nyn )
	1095	j = MAX ( j , nys )
[2628]	1096
[2606]	1097	k = MIN ( k , nzt )
	1098	k = MAX ( k , nzb+1 )
[2628]	1099
[1359]	1100	!
	1101	!-- Check, if particle has moved to another grid cell.
	1102	IF ( i /= ip .OR. j /= jp .OR. k /= kp ) THEN
[2606]	1103	!!
	1104	!-- If the particle stays on the same processor, the particle
	1105	!-- will be added to the particle array of the new processor.
	1106	number_of_particles = prt_count(k,j,i)
	1107	particles => grid_particles(k,j,i)%particles(1:number_of_particles)
[1359]	1108
[2606]	1109	pindex = prt_count(k,j,i)+1
	1110	IF ( pindex > SIZE(grid_particles(k,j,i)%particles) ) &
	1111	THEN
	1112	CALL realloc_particles_array(i,j,k)
	1113	ENDIF
[1359]	1114
[2606]	1115	grid_particles(k,j,i)%particles(pindex) = particles_before_move(n)
	1116	prt_count(k,j,i) = pindex
[1359]	1117
[2606]	1118	particles_before_move(n)%particle_mask = .FALSE.
[1359]	1119	ENDIF
	1120	ENDDO
	1121
	1122	ENDDO
	1123	ENDDO
	1124	ENDDO
	1125
	1126	CALL cpu_log( log_point_s(41), 'lpm_move_particle', 'stop' )
	1127
	1128	RETURN
	1129
	1130	END SUBROUTINE lpm_move_particle
[2628]	1131
	1132	!------------------------------------------------------------------------------!
	1133	! Description:
	1134	! ------------
	1135	!> Check CFL-criterion for each particle. If one particle violated the
	1136	!> criterion the particle will be deleted and a warning message is given.
	1137	!------------------------------------------------------------------------------!
	1138	SUBROUTINE lpm_check_cfl
	1139
	1140	IMPLICIT NONE
	1141
[2709]	1142	INTEGER(iwp) :: i !< running index, x-direction
	1143	INTEGER(iwp) :: j !< running index, y-direction
	1144	INTEGER(iwp) :: k !< running index, z-direction
	1145	INTEGER(iwp) :: n !< running index, number of particles
	1146
[2628]	1147	DO i = nxl, nxr
	1148	DO j = nys, nyn
	1149	DO k = nzb+1, nzt
	1150	number_of_particles = prt_count(k,j,i)
	1151	IF ( number_of_particles <= 0 ) CYCLE
	1152	particles => grid_particles(k,j,i)%particles(1:number_of_particles)
	1153	DO n = 1, number_of_particles
[2709]	1154	!
	1155	!-- Note, check for CFL does not work at first particle timestep
	1156	!-- when both, age and age_m are zero.
	1157	IF ( particles(n)%age - particles(n)%age_m > 0.0_wp ) THEN
	1158	IF(ABS(particles(n)%speed_x) > &
	1159	(dx/(particles(n)%age-particles(n)%age_m)) .OR. &
	1160	ABS(particles(n)%speed_y) > &
	1161	(dy/(particles(n)%age-particles(n)%age_m)) .OR. &
	1162	ABS(particles(n)%speed_z) > &
	1163	((zw(k)-zw(k-1))/(particles(n)%age-particles(n)%age_m))) &
	1164	THEN
	1165	WRITE( message_string, * ) &
	1166	'Particle violated CFL-criterion: particle with id ', &
	1167	particles(n)%id,' will be deleted!'
	1168	CALL message( 'lpm_check_cfl', 'PA0475', 0, 1, 0, 6, 0 )
	1169	particles(n)%particle_mask= .FALSE.
	1170	ENDIF
[2628]	1171	ENDIF
	1172	ENDDO
	1173	ENDDO
	1174	ENDDO
	1175	ENDDO
[1359]	1176
[2628]	1177	END SUBROUTINE lpm_check_cfl
	1178
[1682]	1179	!------------------------------------------------------------------------------!
	1180	! Description:
	1181	! ------------
[1929]	1182	!> If the allocated memory for the particle array do not suffice to add arriving
	1183	!> particles from neighbour grid cells, this subrouting reallocates the
	1184	!> particle array to assure enough memory is available.
[1682]	1185	!------------------------------------------------------------------------------!
[1359]	1186	SUBROUTINE realloc_particles_array (i,j,k,size_in)
	1187
	1188	IMPLICIT NONE
	1189
[1682]	1190	INTEGER(iwp), INTENT(in) :: i !<
	1191	INTEGER(iwp), INTENT(in) :: j !<
	1192	INTEGER(iwp), INTENT(in) :: k !<
[1822]	1193	INTEGER(iwp), INTENT(in), OPTIONAL :: size_in !<
[1359]	1194
[1682]	1195	INTEGER(iwp) :: old_size !<
	1196	INTEGER(iwp) :: new_size !<
	1197	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: tmp_particles_d !<
	1198	TYPE(particle_type), DIMENSION(500) :: tmp_particles_s !<
[1359]	1199
	1200	old_size = SIZE(grid_particles(k,j,i)%particles)
	1201
	1202	IF ( PRESENT(size_in) ) THEN
	1203	new_size = size_in
	1204	ELSE
[1822]	1205	new_size = old_size * ( 1.0_wp + alloc_factor / 100.0_wp )
[1359]	1206	ENDIF
	1207
[1929]	1208	new_size = MAX( new_size, min_nr_particle, old_size + 1 )
[1359]	1209
	1210	IF ( old_size <= 500 ) THEN
	1211
	1212	tmp_particles_s(1:old_size) = grid_particles(k,j,i)%particles(1:old_size)
	1213
	1214	DEALLOCATE(grid_particles(k,j,i)%particles)
	1215	ALLOCATE(grid_particles(k,j,i)%particles(new_size))
	1216
	1217	grid_particles(k,j,i)%particles(1:old_size) = tmp_particles_s(1:old_size)
	1218	grid_particles(k,j,i)%particles(old_size+1:new_size) = zero_particle
	1219
	1220	ELSE
	1221
	1222	ALLOCATE(tmp_particles_d(new_size))
	1223	tmp_particles_d(1:old_size) = grid_particles(k,j,i)%particles
	1224
	1225	DEALLOCATE(grid_particles(k,j,i)%particles)
	1226	ALLOCATE(grid_particles(k,j,i)%particles(new_size))
	1227
	1228	grid_particles(k,j,i)%particles(1:old_size) = tmp_particles_d(1:old_size)
	1229	grid_particles(k,j,i)%particles(old_size+1:new_size) = zero_particle
	1230
	1231	DEALLOCATE(tmp_particles_d)
	1232
	1233	ENDIF
	1234	particles => grid_particles(k,j,i)%particles(1:number_of_particles)
	1235
	1236	RETURN
	1237	END SUBROUTINE realloc_particles_array
	1238
[1936]	1239
	1240
	1241
	1242
	1243	SUBROUTINE dealloc_particles_array
	1244
	1245	IMPLICIT NONE
	1246
	1247	INTEGER(iwp) :: i
	1248	INTEGER(iwp) :: j
	1249	INTEGER(iwp) :: k
	1250	INTEGER(iwp) :: old_size !<
	1251	INTEGER(iwp) :: new_size !<
	1252
	1253	LOGICAL :: dealloc
	1254
	1255	TYPE(particle_type), DIMENSION(:), ALLOCATABLE :: tmp_particles_d !<
	1256	TYPE(particle_type), DIMENSION(500) :: tmp_particles_s !<
	1257
	1258	DO i = nxl, nxr
	1259	DO j = nys, nyn
	1260	DO k = nzb+1, nzt
	1261	!
	1262	!-- Determine number of active particles
	1263	number_of_particles = prt_count(k,j,i)
	1264	!
	1265	!-- Determine allocated memory size
	1266	old_size = SIZE( grid_particles(k,j,i)%particles )
	1267	!
	1268	!-- Check for large unused memory
	1269	dealloc = ( ( number_of_particles < min_nr_particle .AND. &
	1270	old_size > min_nr_particle ) .OR. &
	1271	( number_of_particles > min_nr_particle .AND. &
	1272	old_size - number_of_particles * &
	1273	( 1.0_wp + 0.01_wp * alloc_factor ) > 0.0_wp ) )
	1274
	1275
	1276	IF ( dealloc ) THEN
	1277	IF ( number_of_particles < min_nr_particle ) THEN
	1278	new_size = min_nr_particle
	1279	ELSE
	1280	new_size = INT( number_of_particles * ( 1.0_wp + 0.01_wp * alloc_factor ) )
	1281	ENDIF
	1282
	1283	IF ( number_of_particles <= 500 ) THEN
	1284
	1285	tmp_particles_s(1:number_of_particles) = grid_particles(k,j,i)%particles(1:number_of_particles)
	1286
	1287	DEALLOCATE(grid_particles(k,j,i)%particles)
	1288	ALLOCATE(grid_particles(k,j,i)%particles(new_size))
	1289
	1290	grid_particles(k,j,i)%particles(1:number_of_particles) = tmp_particles_s(1:number_of_particles)
	1291	grid_particles(k,j,i)%particles(number_of_particles+1:new_size) = zero_particle
	1292
	1293	ELSE
	1294
	1295	ALLOCATE(tmp_particles_d(number_of_particles))
	1296	tmp_particles_d(1:number_of_particles) = grid_particles(k,j,i)%particles(1:number_of_particles)
	1297
	1298	DEALLOCATE(grid_particles(k,j,i)%particles)
	1299	ALLOCATE(grid_particles(k,j,i)%particles(new_size))
	1300
	1301	grid_particles(k,j,i)%particles(1:number_of_particles) = tmp_particles_d(1:number_of_particles)
	1302	grid_particles(k,j,i)%particles(number_of_particles+1:new_size) = zero_particle
	1303
	1304	DEALLOCATE(tmp_particles_d)
	1305
	1306	ENDIF
	1307
	1308	ENDIF
	1309	ENDDO
	1310	ENDDO
	1311	ENDDO
	1312
	1313	END SUBROUTINE dealloc_particles_array
	1314
	1315
[1359]	1316	END MODULE lpm_exchange_horiz_mod

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