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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 3285

Last change on this file since 3285 was 3241, checked in by raasch, 6 years ago
various changes to avoid compiler warnings (mainly removal of unused variables)
Property svn:keywords set to `Id`
File size: 27.3 KB

Rev	Line
[1682]	1	!> @file lpm_boundary_conds.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	!
[2718]	17	! Copyright 1997-2018 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[484]	20	! Current revisions:
[58]	21	! -----------------
[2701]	22	!
	23	!
	24	! Former revisions:
	25	! -----------------
	26	! $Id: lpm_boundary_conds.f90 3241 2018-09-12 15:02:00Z scharf $
[3241]	27	! unused variables removed
	28	!
	29	! 3189 2018-08-06 13:18:55Z Giersch
[3189]	30	! Bugfix in calculation of the x/y indices for current particle postion
	31	!
	32	! 3067 2018-06-12 14:04:34Z suehring
[3067]	33	! Remove write statements
	34	!
	35	! 2801 2018-02-14 16:01:55Z thiele
[2801]	36	! Introduce particle transfer in nested models.
	37	!
	38	! 2718 2018-01-02 08:49:38Z maronga
[2716]	39	! Corrected "Former revisions" section
	40	!
	41	! 2701 2017-12-15 15:40:50Z suehring
	42	! Changes from last commit documented
	43	!
	44	! 2698 2017-12-14 18:46:24Z suehring
[2698]	45	! Particle reflections at downward-facing walls implemented. Moreover,
	46	! reflections are adjusted to revised particle grid box location.
[2716]	47	! (responsible Philipp Thiele)
	48	!
	49	! 2696 2017-12-14 17:12:51Z kanani
	50	! Change in file header (GPL part)
	51	!
	52	! 2606 2017-11-10 10:36:31Z schwenkel
[2606]	53	! Changed particle box locations: center of particle box now coincides
	54	! with scalar grid point of same index.
	55	! Renamed module and subroutines: lpm_pack_arrays_mod -> lpm_pack_and_sort_mod
	56	! lpm_pack_all_arrays -> lpm_sort_in_subboxes, lpm_pack_arrays -> lpm_pack
	57	! lpm_sort -> lpm_sort_timeloop_done
	58	!
	59	! 2318 2017-07-20 17:27:44Z suehring
[2318]	60	! Get topography top index via Function call
	61	!
	62	! 2317 2017-07-20 17:27:19Z suehring
[1321]	63	!
[2233]	64	! 2232 2017-05-30 17:47:52Z suehring
	65	! Adjustments to new topography and surface concept
	66	! Rename character range into location, as range is an intrinsic.
	67	!
[2001]	68	! 2000 2016-08-20 18:09:15Z knoop
	69	! Forced header and separation lines into 80 columns
	70	!
[1930]	71	! 1929 2016-06-09 16:25:25Z suehring
	72	! Rewritten wall reflection
	73	!
[1823]	74	! 1822 2016-04-07 07:49:42Z hoffmann
	75	! Tails removed. Unused variables removed.
	76	!
[1683]	77	! 1682 2015-10-07 23:56:08Z knoop
	78	! Code annotations made doxygen readable
	79	!
[1360]	80	! 1359 2014-04-11 17:15:14Z hoffmann
	81	! New particle structure integrated.
	82	! Kind definition added to all floating point numbers.
	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	! revision history before 2012 removed,
	89	! comment fields (!:) to be used for variable explanations added to
	90	! all variable declaration statements
[58]	91	!
[1037]	92	! 1036 2012-10-22 13:43:42Z raasch
	93	! code put under GPL (PALM 3.9)
	94	!
[850]	95	! 849 2012-03-15 10:35:09Z raasch
	96	! routine renamed lpm_boundary_conds, bottom and top boundary conditions
	97	! included (former part of advec_particles)
	98	!
[826]	99	! 824 2012-02-17 09:09:57Z raasch
	100	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3
	101	!
[58]	102	! Initial version (2007/03/09)
	103	!
	104	! Description:
	105	! ------------
[1682]	106	!> Boundary conditions for the Lagrangian particles.
	107	!> The routine consists of two different parts. One handles the bottom (flat)
	108	!> and top boundary. In this part, also particles which exceeded their lifetime
	109	!> are deleted.
	110	!> The other part handles the reflection of particles from vertical walls.
	111	!> This part was developed by Jin Zhang during 2006-2007.
	112	!>
	113	!> To do: Code structure for finding the t_index values and for checking the
	114	!> ----- reflection conditions is basically the same for all four cases, so it
	115	!> should be possible to further simplify/shorten it.
	116	!>
	117	!> THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!!
	118	!> (see offset_ocean_*)
[58]	119	!------------------------------------------------------------------------------!
[2698]	120	SUBROUTINE lpm_boundary_conds( location , i, j, k )
[1682]	121
[58]	122
[1320]	123	USE arrays_3d, &
[3241]	124	ONLY: zw
[58]	125
[1320]	126	USE control_parameters, &
[3241]	127	ONLY: message_string, particle_maximum_age
[58]	128
[1320]	129	USE cpulog, &
	130	ONLY: cpu_log, log_point_s
[849]	131
[1320]	132	USE grid_variables, &
	133	ONLY: ddx, dx, ddy, dy
[58]	134
[1320]	135	USE indices, &
[3241]	136	ONLY: nxl, nxr, nyn, nys, nz, wall_flags_0
[61]	137
[1320]	138	USE kinds
[58]	139
[1320]	140	USE particle_attributes, &
[1822]	141	ONLY: deleted_particles, ibc_par_b, ibc_par_t, number_of_particles, &
[3241]	142	particles, particle_type, use_sgs_for_particles
[60]	143
[1320]	144	USE pegrid
[58]	145
[1320]	146	IMPLICIT NONE
[58]	147
[2232]	148	CHARACTER (LEN=*) :: location !<
[1320]	149
[2698]	150	INTEGER(iwp), INTENT(IN) :: i !<
	151	INTEGER(iwp), INTENT(IN) :: j !<
	152	INTEGER(iwp), INTENT(IN) :: k !<
	153
[1929]	154	INTEGER(iwp) :: inc !< dummy for sorting algorithmus
	155	INTEGER(iwp) :: ir !< dummy for sorting algorithmus
	156	INTEGER(iwp) :: i1 !< grid index (x) of old particle position
	157	INTEGER(iwp) :: i2 !< grid index (x) of current particle position
	158	INTEGER(iwp) :: i3 !< grid index (x) of intermediate particle position
	159	INTEGER(iwp) :: jr !< dummy for sorting algorithmus
	160	INTEGER(iwp) :: j1 !< grid index (y) of old particle position
[2698]	161	INTEGER(iwp) :: j2 !< grid index (y) of current particle position
	162	INTEGER(iwp) :: j3 !< grid index (y) of intermediate particle position
	163	INTEGER(iwp) :: k1 !< grid index (z) of old particle position
	164	INTEGER(iwp) :: k2 !< grid index (z) of current particle position
	165	INTEGER(iwp) :: k3 !< grid index (z) of intermediate particle position
[1929]	166	INTEGER(iwp) :: n !< particle number
	167	INTEGER(iwp) :: t_index !< running index for intermediate particle timesteps in reflection algorithmus
	168	INTEGER(iwp) :: t_index_number !< number of intermediate particle timesteps in reflection algorithmus
[2698]	169	INTEGER(iwp) :: tmp_x !< dummy for sorting algorithm
	170	INTEGER(iwp) :: tmp_y !< dummy for sorting algorithm
	171	INTEGER(iwp) :: tmp_z !< dummy for sorting algorithm
[1929]	172
	173	INTEGER(iwp), DIMENSION(0:10) :: x_ind(0:10) = 0 !< index array (x) of intermediate particle positions
[2698]	174	INTEGER(iwp), DIMENSION(0:10) :: y_ind(0:10) = 0 !< index array (y) of intermediate particle positions
	175	INTEGER(iwp), DIMENSION(0:10) :: z_ind(0:10) = 0 !< index array (z) of intermediate particle positions
[1320]	176
[1929]	177	LOGICAL :: cross_wall_x !< flag to check if particle reflection along x is necessary
	178	LOGICAL :: cross_wall_y !< flag to check if particle reflection along y is necessary
[2698]	179	LOGICAL :: cross_wall_z !< flag to check if particle reflection along z is necessary
[1929]	180	LOGICAL :: reflect_x !< flag to check if particle is already reflected along x
	181	LOGICAL :: reflect_y !< flag to check if particle is already reflected along y
	182	LOGICAL :: reflect_z !< flag to check if particle is already reflected along z
	183	LOGICAL :: tmp_reach_x !< dummy for sorting algorithmus
	184	LOGICAL :: tmp_reach_y !< dummy for sorting algorithmus
	185	LOGICAL :: tmp_reach_z !< dummy for sorting algorithmus
	186	LOGICAL :: x_wall_reached !< flag to check if particle has already reached wall
	187	LOGICAL :: y_wall_reached !< flag to check if particle has already reached wall
[2698]	188	LOGICAL :: z_wall_reached !< flag to check if particle has already reached wall
[1320]	189
[1929]	190	LOGICAL, DIMENSION(0:10) :: reach_x !< flag to check if particle is at a yz-wall
	191	LOGICAL, DIMENSION(0:10) :: reach_y !< flag to check if particle is at a xz-wall
	192	LOGICAL, DIMENSION(0:10) :: reach_z !< flag to check if particle is at a xy-wall
[1320]	193
[1929]	194	REAL(wp) :: dt_particle !< particle timestep
	195	REAL(wp) :: eps = 1E-10_wp !< security number to check if particle has reached a wall
	196	REAL(wp) :: pos_x !< intermediate particle position (x)
	197	REAL(wp) :: pos_x_old !< particle position (x) at previous particle timestep
	198	REAL(wp) :: pos_y !< intermediate particle position (y)
	199	REAL(wp) :: pos_y_old !< particle position (y) at previous particle timestep
	200	REAL(wp) :: pos_z !< intermediate particle position (z)
	201	REAL(wp) :: pos_z_old !< particle position (z) at previous particle timestep
	202	REAL(wp) :: prt_x !< current particle position (x)
	203	REAL(wp) :: prt_y !< current particle position (y)
	204	REAL(wp) :: prt_z !< current particle position (z)
	205	REAL(wp) :: t_old !< previous reflection time
	206	REAL(wp) :: tmp_t !< dummy for sorting algorithmus
	207	REAL(wp) :: xwall !< location of wall in x
	208	REAL(wp) :: ywall !< location of wall in y
[2698]	209	REAL(wp) :: zwall !< location of wall in z
[1929]	210
	211	REAL(wp), DIMENSION(0:10) :: t !< reflection time
	212
	213
[2232]	214	IF ( location == 'bottom/top' ) THEN
[58]	215
[849]	216	!
	217	!-- Apply boundary conditions to those particles that have crossed the top or
	218	!-- bottom boundary and delete those particles, which are older than allowed
	219	DO n = 1, number_of_particles
[61]	220
[849]	221	!
	222	!-- Stop if particles have moved further than the length of one
	223	!-- PE subdomain (newly released particles have age = age_m!)
	224	IF ( particles(n)%age /= particles(n)%age_m ) THEN
	225	IF ( ABS(particles(n)%speed_x) > &
	226	((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. &
	227	ABS(particles(n)%speed_y) > &
	228	((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN
[60]	229
[849]	230	WRITE( message_string, * ) 'particle too fast. n = ', n
	231	CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 )
	232	ENDIF
	233	ENDIF
[58]	234
[849]	235	IF ( particles(n)%age > particle_maximum_age .AND. &
[1359]	236	particles(n)%particle_mask ) &
[849]	237	THEN
[1359]	238	particles(n)%particle_mask = .FALSE.
[849]	239	deleted_particles = deleted_particles + 1
	240	ENDIF
[58]	241
[2801]	242	IF ( particles(n)%z >= zw(nz) .AND. particles(n)%particle_mask ) THEN
[849]	243	IF ( ibc_par_t == 1 ) THEN
[61]	244	!
[849]	245	!-- Particle absorption
[1359]	246	particles(n)%particle_mask = .FALSE.
[849]	247	deleted_particles = deleted_particles + 1
	248	ELSEIF ( ibc_par_t == 2 ) THEN
	249	!
	250	!-- Particle reflection
[2801]	251	particles(n)%z = 2.0_wp * zw(nz) - particles(n)%z
[849]	252	particles(n)%speed_z = -particles(n)%speed_z
	253	IF ( use_sgs_for_particles .AND. &
[1359]	254	particles(n)%rvar3 > 0.0_wp ) THEN
[849]	255	particles(n)%rvar3 = -particles(n)%rvar3
	256	ENDIF
	257	ENDIF
	258	ENDIF
[1359]	259
	260	IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN
[849]	261	IF ( ibc_par_b == 1 ) THEN
	262	!
	263	!-- Particle absorption
[1359]	264	particles(n)%particle_mask = .FALSE.
[849]	265	deleted_particles = deleted_particles + 1
	266	ELSEIF ( ibc_par_b == 2 ) THEN
	267	!
	268	!-- Particle reflection
[1359]	269	particles(n)%z = 2.0_wp * zw(0) - particles(n)%z
[849]	270	particles(n)%speed_z = -particles(n)%speed_z
	271	IF ( use_sgs_for_particles .AND. &
[1359]	272	particles(n)%rvar3 < 0.0_wp ) THEN
[849]	273	particles(n)%rvar3 = -particles(n)%rvar3
	274	ENDIF
	275	ENDIF
	276	ENDIF
	277	ENDDO
[58]	278
[2232]	279	ELSEIF ( location == 'walls' ) THEN
[58]	280
[1929]	281
[849]	282	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' )
	283
	284	DO n = 1, number_of_particles
[1929]	285	!
	286	!-- Recalculate particle timestep
[849]	287	dt_particle = particles(n)%age - particles(n)%age_m
[1929]	288	!
	289	!-- Obtain x/y indices for current particle position
[2606]	290	i2 = particles(n)%x * ddx
	291	j2 = particles(n)%y * ddy
[2698]	292	IF (zw(k) < particles(n)%z ) k2 = k + 1
[3189]	293	IF (zw(k) > particles(n)%z .AND. zw(k-1) < particles(n)%z ) k2 = k
[2698]	294	IF (zw(k-1) > particles(n)%z ) k2 = k - 1
[1929]	295	!
	296	!-- Save current particle positions
[849]	297	prt_x = particles(n)%x
	298	prt_y = particles(n)%y
	299	prt_z = particles(n)%z
[58]	300	!
[1929]	301	!-- Recalculate old particle positions
	302	pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle
	303	pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle
	304	pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle
[849]	305	!
[1929]	306	!-- Obtain x/y indices for old particle positions
[2698]	307	i1 = i
	308	j1 = j
	309	k1 = k
[58]	310	!
[1929]	311	!-- Determine horizontal as well as vertical walls at which particle can
	312	!-- be potentially reflected.
	313	!-- Start with walls aligned in yz layer.
	314	!-- Wall to the right
	315	IF ( prt_x > pos_x_old ) THEN
[2698]	316	xwall = ( i1 + 1 ) * dx
[1929]	317	!
	318	!-- Wall to the left
	319	ELSE
[2698]	320	xwall = i1 * dx
[1929]	321	ENDIF
	322	!
	323	!-- Walls aligned in xz layer
	324	!-- Wall to the north
	325	IF ( prt_y > pos_y_old ) THEN
[2698]	326	ywall = ( j1 +1 ) * dy
[1929]	327	!-- Wall to the south
	328	ELSE
[2698]	329	ywall = j1 * dy
[1929]	330	ENDIF
[2698]	331
	332	IF ( prt_z > pos_z_old ) THEN
	333	zwall = zw(k)
	334	ELSE
	335	zwall = zw(k-1)
	336	ENDIF
[1929]	337	!
	338	!-- Initialize flags to check if particle reflection is necessary
	339	cross_wall_x = .FALSE.
	340	cross_wall_y = .FALSE.
[2698]	341	cross_wall_z = .FALSE.
[1929]	342	!
	343	!-- Initialize flags to check if a wall is reached
	344	reach_x = .FALSE.
	345	reach_y = .FALSE.
	346	reach_z = .FALSE.
	347	!
	348	!-- Initialize flags to check if a particle was already reflected
[2698]	349	reflect_x = .FALSE.
	350	reflect_y = .FALSE.
	351	reflect_z = .FALSE.
[1929]	352	!
[2698]	353	!-- Initialize flags to check if a wall is already crossed.
[1929]	354	!-- ( Required to obtain correct indices. )
	355	x_wall_reached = .FALSE.
	356	y_wall_reached = .FALSE.
[2698]	357	z_wall_reached = .FALSE.
[1929]	358	!
	359	!-- Initialize time array
	360	t = 0.0_wp
	361	!
	362	!-- Check if particle can reach any wall. This case, calculate the
	363	!-- fractional time needed to reach this wall. Store this fractional
	364	!-- timestep in array t. Moreover, store indices for these grid
	365	!-- boxes where the respective wall belongs to.
	366	!-- Start with x-direction.
	367	t_index = 1
	368	t(t_index) = ( xwall - pos_x_old ) &
	369	/ MERGE( MAX( prt_x - pos_x_old, 1E-30_wp ), &
	370	MIN( prt_x - pos_x_old, -1E-30_wp ), &
	371	prt_x > pos_x_old )
	372	x_ind(t_index) = i2
	373	y_ind(t_index) = j1
[2698]	374	z_ind(t_index) = k1
[1929]	375	reach_x(t_index) = .TRUE.
	376	reach_y(t_index) = .FALSE.
	377	reach_z(t_index) = .FALSE.
	378	!
	379	!-- Store these values only if particle really reaches any wall. t must
	380	!-- be in a interval between [0:1].
	381	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	382	t_index = t_index + 1
	383	cross_wall_x = .TRUE.
	384	ENDIF
	385	!
	386	!-- y-direction
	387	t(t_index) = ( ywall - pos_y_old ) &
	388	/ MERGE( MAX( prt_y - pos_y_old, 1E-30_wp ), &
	389	MIN( prt_y - pos_y_old, -1E-30_wp ), &
	390	prt_y > pos_y_old )
	391	x_ind(t_index) = i1
	392	y_ind(t_index) = j2
[2698]	393	z_ind(t_index) = k1
[1929]	394	reach_x(t_index) = .FALSE.
	395	reach_y(t_index) = .TRUE.
	396	reach_z(t_index) = .FALSE.
	397	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	398	t_index = t_index + 1
	399	cross_wall_y = .TRUE.
	400	ENDIF
	401	!
	402	!-- z-direction
[2698]	403	t(t_index) = (zwall - pos_z_old ) &
	404	/ MERGE( MAX( prt_z - pos_z_old, 1E-30_wp ), &
	405	MIN( prt_z - pos_z_old, -1E-30_wp ), &
	406	prt_z > pos_z_old )
	407
	408	x_ind(t_index) = i1
	409	y_ind(t_index) = j1
	410	z_ind(t_index) = k2
	411	reach_x(t_index) = .FALSE.
	412	reach_y(t_index) = .FALSE.
	413	reach_z(t_index) = .TRUE.
	414	IF( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp) THEN
	415	t_index = t_index + 1
	416	cross_wall_z = .TRUE.
	417	ENDIF
	418
[1929]	419	t_index_number = t_index - 1
[58]	420	!
[1929]	421	!-- Carry out reflection only if particle reaches any wall
[2698]	422	IF ( cross_wall_x .OR. cross_wall_y .OR. cross_wall_z ) THEN
[58]	423	!
[1929]	424	!-- Sort fractional timesteps in ascending order. Also sort the
	425	!-- corresponding indices and flag according to the time interval a
	426	!-- particle reaches the respective wall.
	427	inc = 1
	428	jr = 1
	429	DO WHILE ( inc <= t_index_number )
	430	inc = 3 * inc + 1
	431	ENDDO
[58]	432
[1929]	433	DO WHILE ( inc > 1 )
	434	inc = inc / 3
	435	DO ir = inc+1, t_index_number
	436	tmp_t = t(ir)
	437	tmp_x = x_ind(ir)
	438	tmp_y = y_ind(ir)
[2698]	439	tmp_z = z_ind(ir)
[1929]	440	tmp_reach_x = reach_x(ir)
	441	tmp_reach_y = reach_y(ir)
	442	tmp_reach_z = reach_z(ir)
	443	jr = ir
	444	DO WHILE ( t(jr-inc) > tmp_t )
	445	t(jr) = t(jr-inc)
	446	x_ind(jr) = x_ind(jr-inc)
	447	y_ind(jr) = y_ind(jr-inc)
[2698]	448	z_ind(jr) = z_ind(jr-inc)
[1929]	449	reach_x(jr) = reach_x(jr-inc)
	450	reach_y(jr) = reach_y(jr-inc)
	451	reach_z(jr) = reach_z(jr-inc)
	452	jr = jr - inc
	453	IF ( jr <= inc ) EXIT
[58]	454	ENDDO
[1929]	455	t(jr) = tmp_t
	456	x_ind(jr) = tmp_x
	457	y_ind(jr) = tmp_y
[2698]	458	z_ind(jr) = tmp_z
[1929]	459	reach_x(jr) = tmp_reach_x
	460	reach_y(jr) = tmp_reach_y
	461	reach_z(jr) = tmp_reach_z
[58]	462	ENDDO
[1929]	463	ENDDO
[58]	464	!
[1929]	465	!-- Initialize temporary particle positions
	466	pos_x = pos_x_old
	467	pos_y = pos_y_old
	468	pos_z = pos_z_old
	469	!
	470	!-- Loop over all times a particle possibly moves into a new grid box
	471	t_old = 0.0_wp
	472	DO t_index = 1, t_index_number
	473	!
	474	!-- Calculate intermediate particle position according to the
	475	!-- timesteps a particle reaches any wall.
	476	pos_x = pos_x + ( t(t_index) - t_old ) * dt_particle &
	477	* particles(n)%speed_x
	478	pos_y = pos_y + ( t(t_index) - t_old ) * dt_particle &
	479	* particles(n)%speed_y
	480	pos_z = pos_z + ( t(t_index) - t_old ) * dt_particle &
	481	* particles(n)%speed_z
	482	!
	483	!-- Obtain x/y grid indices for intermediate particle position from
	484	!-- sorted index array
	485	i3 = x_ind(t_index)
	486	j3 = y_ind(t_index)
[2698]	487	k3 = z_ind(t_index)
[1929]	488	!
	489	!-- Check which wall is already reached
	490	IF ( .NOT. x_wall_reached ) x_wall_reached = reach_x(t_index)
[2698]	491	IF ( .NOT. y_wall_reached ) y_wall_reached = reach_y(t_index)
	492	IF ( .NOT. z_wall_reached ) z_wall_reached = reach_z(t_index)
[1929]	493	!
	494	!-- Check if a particle needs to be reflected at any yz-wall. If
	495	!-- necessary, carry out reflection. Please note, a security
[2698]	496	!-- constant is required, as the particle position does not
[1929]	497	!-- necessarily exactly match the wall location due to rounding
[2698]	498	!-- errors.
	499	IF ( reach_x(t_index) .AND. &
	500	ABS( pos_x - xwall ) < eps .AND. &
	501	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	502	.NOT. reflect_x ) THEN
[2698]	503	!
	504	!
[1929]	505	!-- Reflection in x-direction.
	506	!-- Ensure correct reflection by MIN/MAX functions, depending on
	507	!-- direction of particle transport.
[2698]	508	!-- Due to rounding errors pos_x does not exactly match the wall
[1929]	509	!-- location, leading to erroneous reflection.
	510	pos_x = MERGE( MIN( 2.0_wp * xwall - pos_x, xwall ), &
	511	MAX( 2.0_wp * xwall - pos_x, xwall ), &
	512	particles(n)%x > xwall )
	513	!
	514	!-- Change sign of particle speed
	515	particles(n)%speed_x = - particles(n)%speed_x
	516	!
[2698]	517	!-- Also change sign of subgrid-scale particle speed
[1929]	518	particles(n)%rvar1 = - particles(n)%rvar1
	519	!
	520	!-- Set flag that reflection along x is already done
	521	reflect_x = .TRUE.
	522	!
[2698]	523	!-- As the particle does not cross any further yz-wall during
[1929]	524	!-- this timestep, set further x-indices to the current one.
	525	x_ind(t_index:t_index_number) = i1
	526	!
	527	!-- If particle already reached the wall but was not reflected,
	528	!-- set further x-indices to the new one.
	529	ELSEIF ( x_wall_reached .AND. .NOT. reflect_x ) THEN
	530	x_ind(t_index:t_index_number) = i2
[2698]	531	ENDIF !particle reflection in x direction done
	532
[1929]	533	!
	534	!-- Check if a particle needs to be reflected at any xz-wall. If
[2698]	535	!-- necessary, carry out reflection. Please note, a security
	536	!-- constant is required, as the particle position does not
	537	!-- necessarily exactly match the wall location due to rounding
	538	!-- errors.
	539	IF ( reach_y(t_index) .AND. &
	540	ABS( pos_y - ywall ) < eps .AND. &
	541	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
	542	.NOT. reflect_y ) THEN
	543	!
	544	!
	545	!-- Reflection in y-direction.
	546	!-- Ensure correct reflection by MIN/MAX functions, depending on
	547	!-- direction of particle transport.
	548	!-- Due to rounding errors pos_y does not exactly match the wall
	549	!-- location, leading to erroneous reflection.
[1929]	550	pos_y = MERGE( MIN( 2.0_wp * ywall - pos_y, ywall ), &
	551	MAX( 2.0_wp * ywall - pos_y, ywall ), &
[2698]	552	particles(n)%y > ywall )
	553	!
	554	!-- Change sign of particle speed
	555	particles(n)%speed_y = - particles(n)%speed_y
	556	!
	557	!-- Also change sign of subgrid-scale particle speed
	558	particles(n)%rvar2 = - particles(n)%rvar2
	559	!
	560	!-- Set flag that reflection along y is already done
	561	reflect_y = .TRUE.
	562	!
	563	!-- As the particle does not cross any further xz-wall during
	564	!-- this timestep, set further y-indices to the current one.
[1929]	565	y_ind(t_index:t_index_number) = j1
[2698]	566	!
	567	!-- If particle already reached the wall but was not reflected,
	568	!-- set further y-indices to the new one.
[1929]	569	ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN
[2698]	570	y_ind(t_index:t_index_number) = j2
	571	ENDIF !particle reflection in y direction done
	572
[58]	573	!
[1929]	574	!-- Check if a particle needs to be reflected at any xy-wall. If
[2698]	575	!-- necessary, carry out reflection. Please note, a security
	576	!-- constant is required, as the particle position does not
	577	!-- necessarily exactly match the wall location due to rounding
	578	!-- errors.
	579	IF ( reach_z(t_index) .AND. &
	580	ABS( pos_z - zwall ) < eps .AND. &
	581	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	582	.NOT. reflect_z ) THEN
[2698]	583	!
	584	!
	585	!-- Reflection in z-direction.
	586	!-- Ensure correct reflection by MIN/MAX functions, depending on
	587	!-- direction of particle transport.
	588	!-- Due to rounding errors pos_z does not exactly match the wall
	589	!-- location, leading to erroneous reflection.
	590	pos_z = MERGE( MIN( 2.0_wp * zwall - pos_z, zwall ), &
	591	MAX( 2.0_wp * zwall - pos_z, zwall ), &
	592	particles(n)%z > zwall )
[2232]	593	!
[2698]	594	!-- Change sign of particle speed
	595	particles(n)%speed_z = - particles(n)%speed_z
[58]	596	!
[2698]	597	!-- Also change sign of subgrid-scale particle speed
	598	particles(n)%rvar3 = - particles(n)%rvar3
	599	!
	600	!-- Set flag that reflection along z is already done
	601	reflect_z = .TRUE.
	602	!
	603	!-- As the particle does not cross any further xy-wall during
	604	!-- this timestep, set further z-indices to the current one.
	605	z_ind(t_index:t_index_number) = k1
	606	!
	607	!-- If particle already reached the wall but was not reflected,
	608	!-- set further z-indices to the new one.
	609	ELSEIF ( z_wall_reached .AND. .NOT. reflect_z ) THEN
	610	z_ind(t_index:t_index_number) = k2
	611	ENDIF !particle reflection in z direction done
	612
	613	!
[1929]	614	!-- Swap time
	615	t_old = t(t_index)
[58]	616
[1929]	617	ENDDO
[61]	618	!
[1929]	619	!-- If a particle was reflected, calculate final position from last
	620	!-- intermediate position.
	621	IF ( reflect_x .OR. reflect_y .OR. reflect_z ) THEN
[61]	622
[1929]	623	particles(n)%x = pos_x + ( 1.0_wp - t_old ) * dt_particle &
	624	* particles(n)%speed_x
	625	particles(n)%y = pos_y + ( 1.0_wp - t_old ) * dt_particle &
	626	* particles(n)%speed_y
	627	particles(n)%z = pos_z + ( 1.0_wp - t_old ) * dt_particle &
	628	* particles(n)%speed_z
[61]	629
[849]	630	ENDIF
[61]	631
[1929]	632	ENDIF
[61]	633
[849]	634	ENDDO
[58]	635
[849]	636	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' )
[58]	637
[849]	638	ENDIF
[61]	639
[849]	640	END SUBROUTINE lpm_boundary_conds

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