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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 2716

Last change on this file since 2716 was 2716, checked in by kanani, 6 years ago
Correction of "Former revisions" section
Property svn:keywords set to `Id`
File size: 27.2 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	!
[2101]	17	! Copyright 1997-2017 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 2716 2017-12-29 16:35:59Z kanani $
[2716]	27	! Corrected "Former revisions" section
	28	!
	29	! 2701 2017-12-15 15:40:50Z suehring
	30	! Changes from last commit documented
	31	!
	32	! 2698 2017-12-14 18:46:24Z suehring
[2698]	33	! Particle reflections at downward-facing walls implemented. Moreover,
	34	! reflections are adjusted to revised particle grid box location.
[2716]	35	! (responsible Philipp Thiele)
	36	!
	37	! 2696 2017-12-14 17:12:51Z kanani
	38	! Change in file header (GPL part)
	39	!
	40	! 2606 2017-11-10 10:36:31Z schwenkel
[2606]	41	! Changed particle box locations: center of particle box now coincides
	42	! with scalar grid point of same index.
	43	! Renamed module and subroutines: lpm_pack_arrays_mod -> lpm_pack_and_sort_mod
	44	! lpm_pack_all_arrays -> lpm_sort_in_subboxes, lpm_pack_arrays -> lpm_pack
	45	! lpm_sort -> lpm_sort_timeloop_done
	46	!
	47	! 2318 2017-07-20 17:27:44Z suehring
[2318]	48	! Get topography top index via Function call
	49	!
	50	! 2317 2017-07-20 17:27:19Z suehring
[1321]	51	!
[2233]	52	! 2232 2017-05-30 17:47:52Z suehring
	53	! Adjustments to new topography and surface concept
	54	! Rename character range into location, as range is an intrinsic.
	55	!
[2001]	56	! 2000 2016-08-20 18:09:15Z knoop
	57	! Forced header and separation lines into 80 columns
	58	!
[1930]	59	! 1929 2016-06-09 16:25:25Z suehring
	60	! Rewritten wall reflection
	61	!
[1823]	62	! 1822 2016-04-07 07:49:42Z hoffmann
	63	! Tails removed. Unused variables removed.
	64	!
[1683]	65	! 1682 2015-10-07 23:56:08Z knoop
	66	! Code annotations made doxygen readable
	67	!
[1360]	68	! 1359 2014-04-11 17:15:14Z hoffmann
	69	! New particle structure integrated.
	70	! Kind definition added to all floating point numbers.
	71	!
[1321]	72	! 1320 2014-03-20 08:40:49Z raasch
[1320]	73	! ONLY-attribute added to USE-statements,
	74	! kind-parameters added to all INTEGER and REAL declaration statements,
	75	! kinds are defined in new module kinds,
	76	! revision history before 2012 removed,
	77	! comment fields (!:) to be used for variable explanations added to
	78	! all variable declaration statements
[58]	79	!
[1037]	80	! 1036 2012-10-22 13:43:42Z raasch
	81	! code put under GPL (PALM 3.9)
	82	!
[850]	83	! 849 2012-03-15 10:35:09Z raasch
	84	! routine renamed lpm_boundary_conds, bottom and top boundary conditions
	85	! included (former part of advec_particles)
	86	!
[826]	87	! 824 2012-02-17 09:09:57Z raasch
	88	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3
	89	!
[58]	90	! Initial version (2007/03/09)
	91	!
	92	! Description:
	93	! ------------
[1682]	94	!> Boundary conditions for the Lagrangian particles.
	95	!> The routine consists of two different parts. One handles the bottom (flat)
	96	!> and top boundary. In this part, also particles which exceeded their lifetime
	97	!> are deleted.
	98	!> The other part handles the reflection of particles from vertical walls.
	99	!> This part was developed by Jin Zhang during 2006-2007.
	100	!>
	101	!> To do: Code structure for finding the t_index values and for checking the
	102	!> ----- reflection conditions is basically the same for all four cases, so it
	103	!> should be possible to further simplify/shorten it.
	104	!>
	105	!> THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!!
	106	!> (see offset_ocean_*)
[58]	107	!------------------------------------------------------------------------------!
[2698]	108	SUBROUTINE lpm_boundary_conds( location , i, j, k )
[1682]	109
[58]	110
[1320]	111	USE arrays_3d, &
	112	ONLY: zu, zw
[58]	113
[1320]	114	USE control_parameters, &
[1822]	115	ONLY: dz, message_string, particle_maximum_age
[58]	116
[1320]	117	USE cpulog, &
	118	ONLY: cpu_log, log_point_s
[849]	119
[1320]	120	USE grid_variables, &
	121	ONLY: ddx, dx, ddy, dy
[58]	122
[1320]	123	USE indices, &
[2698]	124	ONLY: nxl, nxr, nyn, nys, nz, nzb, wall_flags_0,nyng,nysg
[61]	125
[1320]	126	USE kinds
[58]	127
[1320]	128	USE particle_attributes, &
[1822]	129	ONLY: deleted_particles, ibc_par_b, ibc_par_t, number_of_particles, &
	130	particles, particle_type, offset_ocean_nzt_m1, &
	131	use_sgs_for_particles
[60]	132
[1320]	133	USE pegrid
[58]	134
[1320]	135	IMPLICIT NONE
[58]	136
[2232]	137	CHARACTER (LEN=*) :: location !<
[1320]	138
[2698]	139	INTEGER(iwp), INTENT(IN) :: i !<
	140	INTEGER(iwp), INTENT(IN) :: j !<
	141	INTEGER(iwp), INTENT(IN) :: k !<
	142
[1929]	143	INTEGER(iwp) :: inc !< dummy for sorting algorithmus
	144	INTEGER(iwp) :: ir !< dummy for sorting algorithmus
	145	INTEGER(iwp) :: i1 !< grid index (x) of old particle position
	146	INTEGER(iwp) :: i2 !< grid index (x) of current particle position
	147	INTEGER(iwp) :: i3 !< grid index (x) of intermediate particle position
	148	INTEGER(iwp) :: jr !< dummy for sorting algorithmus
	149	INTEGER(iwp) :: j1 !< grid index (y) of old particle position
[2698]	150	INTEGER(iwp) :: j2 !< grid index (y) of current particle position
	151	INTEGER(iwp) :: j3 !< grid index (y) of intermediate particle position
	152	INTEGER(iwp) :: k1 !< grid index (z) of old particle position
	153	INTEGER(iwp) :: k2 !< grid index (z) of current particle position
	154	INTEGER(iwp) :: k3 !< grid index (z) of intermediate particle position
[1929]	155	INTEGER(iwp) :: n !< particle number
	156	INTEGER(iwp) :: t_index !< running index for intermediate particle timesteps in reflection algorithmus
	157	INTEGER(iwp) :: t_index_number !< number of intermediate particle timesteps in reflection algorithmus
[2698]	158	INTEGER(iwp) :: tmp_x !< dummy for sorting algorithm
	159	INTEGER(iwp) :: tmp_y !< dummy for sorting algorithm
	160	INTEGER(iwp) :: tmp_z !< dummy for sorting algorithm
[1929]	161
	162	INTEGER(iwp), DIMENSION(0:10) :: x_ind(0:10) = 0 !< index array (x) of intermediate particle positions
[2698]	163	INTEGER(iwp), DIMENSION(0:10) :: y_ind(0:10) = 0 !< index array (y) of intermediate particle positions
	164	INTEGER(iwp), DIMENSION(0:10) :: z_ind(0:10) = 0 !< index array (z) of intermediate particle positions
[1320]	165
[1929]	166	LOGICAL :: cross_wall_x !< flag to check if particle reflection along x is necessary
	167	LOGICAL :: cross_wall_y !< flag to check if particle reflection along y is necessary
[2698]	168	LOGICAL :: cross_wall_z !< flag to check if particle reflection along z is necessary
[1929]	169	LOGICAL :: reflect_x !< flag to check if particle is already reflected along x
	170	LOGICAL :: reflect_y !< flag to check if particle is already reflected along y
	171	LOGICAL :: reflect_z !< flag to check if particle is already reflected along z
	172	LOGICAL :: tmp_reach_x !< dummy for sorting algorithmus
	173	LOGICAL :: tmp_reach_y !< dummy for sorting algorithmus
	174	LOGICAL :: tmp_reach_z !< dummy for sorting algorithmus
	175	LOGICAL :: x_wall_reached !< flag to check if particle has already reached wall
	176	LOGICAL :: y_wall_reached !< flag to check if particle has already reached wall
[2698]	177	LOGICAL :: z_wall_reached !< flag to check if particle has already reached wall
[1320]	178
[1929]	179	LOGICAL, DIMENSION(0:10) :: reach_x !< flag to check if particle is at a yz-wall
	180	LOGICAL, DIMENSION(0:10) :: reach_y !< flag to check if particle is at a xz-wall
	181	LOGICAL, DIMENSION(0:10) :: reach_z !< flag to check if particle is at a xy-wall
[1320]	182
[1929]	183	REAL(wp) :: dt_particle !< particle timestep
	184	REAL(wp) :: dum !< dummy argument
	185	REAL(wp) :: eps = 1E-10_wp !< security number to check if particle has reached a wall
	186	REAL(wp) :: pos_x !< intermediate particle position (x)
	187	REAL(wp) :: pos_x_old !< particle position (x) at previous particle timestep
	188	REAL(wp) :: pos_y !< intermediate particle position (y)
	189	REAL(wp) :: pos_y_old !< particle position (y) at previous particle timestep
	190	REAL(wp) :: pos_z !< intermediate particle position (z)
	191	REAL(wp) :: pos_z_old !< particle position (z) at previous particle timestep
	192	REAL(wp) :: prt_x !< current particle position (x)
	193	REAL(wp) :: prt_y !< current particle position (y)
	194	REAL(wp) :: prt_z !< current particle position (z)
	195	REAL(wp) :: t_old !< previous reflection time
	196	REAL(wp) :: tmp_t !< dummy for sorting algorithmus
	197	REAL(wp) :: xwall !< location of wall in x
	198	REAL(wp) :: ywall !< location of wall in y
[2698]	199	REAL(wp) :: zwall !< location of wall in z
[1929]	200
	201	REAL(wp), DIMENSION(0:10) :: t !< reflection time
	202
	203
[2232]	204	IF ( location == 'bottom/top' ) THEN
[58]	205
[849]	206	!
	207	!-- Apply boundary conditions to those particles that have crossed the top or
	208	!-- bottom boundary and delete those particles, which are older than allowed
	209	DO n = 1, number_of_particles
[61]	210
[849]	211	!
	212	!-- Stop if particles have moved further than the length of one
	213	!-- PE subdomain (newly released particles have age = age_m!)
	214	IF ( particles(n)%age /= particles(n)%age_m ) THEN
	215	IF ( ABS(particles(n)%speed_x) > &
	216	((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. &
	217	ABS(particles(n)%speed_y) > &
	218	((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN
[60]	219
[849]	220	WRITE( message_string, * ) 'particle too fast. n = ', n
	221	CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 )
	222	ENDIF
	223	ENDIF
[58]	224
[849]	225	IF ( particles(n)%age > particle_maximum_age .AND. &
[1359]	226	particles(n)%particle_mask ) &
[849]	227	THEN
[1359]	228	particles(n)%particle_mask = .FALSE.
[849]	229	deleted_particles = deleted_particles + 1
	230	ENDIF
[58]	231
[1359]	232	IF ( particles(n)%z >= zu(nz) .AND. particles(n)%particle_mask ) THEN
[849]	233	IF ( ibc_par_t == 1 ) THEN
[61]	234	!
[849]	235	!-- Particle absorption
[1359]	236	particles(n)%particle_mask = .FALSE.
[849]	237	deleted_particles = deleted_particles + 1
	238	ELSEIF ( ibc_par_t == 2 ) THEN
	239	!
	240	!-- Particle reflection
[1359]	241	particles(n)%z = 2.0_wp * zu(nz) - particles(n)%z
[849]	242	particles(n)%speed_z = -particles(n)%speed_z
	243	IF ( use_sgs_for_particles .AND. &
[1359]	244	particles(n)%rvar3 > 0.0_wp ) THEN
[849]	245	particles(n)%rvar3 = -particles(n)%rvar3
	246	ENDIF
	247	ENDIF
	248	ENDIF
[1359]	249
	250	IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN
[849]	251	IF ( ibc_par_b == 1 ) THEN
	252	!
	253	!-- Particle absorption
[1359]	254	particles(n)%particle_mask = .FALSE.
[849]	255	deleted_particles = deleted_particles + 1
	256	ELSEIF ( ibc_par_b == 2 ) THEN
	257	!
	258	!-- Particle reflection
[1359]	259	particles(n)%z = 2.0_wp * zw(0) - particles(n)%z
[849]	260	particles(n)%speed_z = -particles(n)%speed_z
	261	IF ( use_sgs_for_particles .AND. &
[1359]	262	particles(n)%rvar3 < 0.0_wp ) THEN
[849]	263	particles(n)%rvar3 = -particles(n)%rvar3
	264	ENDIF
	265	ENDIF
	266	ENDIF
	267	ENDDO
[58]	268
[2232]	269	ELSEIF ( location == 'walls' ) THEN
[58]	270
[1929]	271
[849]	272	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' )
	273
	274	DO n = 1, number_of_particles
[1929]	275	!
	276	!-- Recalculate particle timestep
[849]	277	dt_particle = particles(n)%age - particles(n)%age_m
[1929]	278	!
	279	!-- Obtain x/y indices for current particle position
[2606]	280	i2 = particles(n)%x * ddx
	281	j2 = particles(n)%y * ddy
[2698]	282	IF (zw(k) < particles(n)%z ) k2 = k + 1
	283	IF (zw(k-1) > particles(n)%z ) k2 = k - 1
[1929]	284	!
	285	!-- Save current particle positions
[849]	286	prt_x = particles(n)%x
	287	prt_y = particles(n)%y
	288	prt_z = particles(n)%z
[58]	289	!
[1929]	290	!-- Recalculate old particle positions
	291	pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle
	292	pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle
	293	pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle
[849]	294	!
[1929]	295	!-- Obtain x/y indices for old particle positions
[2698]	296	i1 = i
	297	j1 = j
	298	k1 = k
[58]	299	!
[1929]	300	!-- Determine horizontal as well as vertical walls at which particle can
	301	!-- be potentially reflected.
	302	!-- Start with walls aligned in yz layer.
	303	!-- Wall to the right
	304	IF ( prt_x > pos_x_old ) THEN
[2698]	305	xwall = ( i1 + 1 ) * dx
[1929]	306	!
	307	!-- Wall to the left
	308	ELSE
[2698]	309	xwall = i1 * dx
[1929]	310	ENDIF
	311	!
	312	!-- Walls aligned in xz layer
	313	!-- Wall to the north
	314	IF ( prt_y > pos_y_old ) THEN
[2698]	315	ywall = ( j1 +1 ) * dy
[1929]	316	!-- Wall to the south
	317	ELSE
[2698]	318	ywall = j1 * dy
[1929]	319	ENDIF
[2698]	320
	321	IF ( prt_z > pos_z_old ) THEN
	322	zwall = zw(k)
	323	ELSE
	324	zwall = zw(k-1)
	325	ENDIF
[1929]	326	!
	327	!-- Initialize flags to check if particle reflection is necessary
	328	cross_wall_x = .FALSE.
	329	cross_wall_y = .FALSE.
[2698]	330	cross_wall_z = .FALSE.
[1929]	331	!
	332	!-- Initialize flags to check if a wall is reached
	333	reach_x = .FALSE.
	334	reach_y = .FALSE.
	335	reach_z = .FALSE.
	336	!
	337	!-- Initialize flags to check if a particle was already reflected
[2698]	338	reflect_x = .FALSE.
	339	reflect_y = .FALSE.
	340	reflect_z = .FALSE.
[1929]	341	!
[2698]	342	!-- Initialize flags to check if a wall is already crossed.
[1929]	343	!-- ( Required to obtain correct indices. )
	344	x_wall_reached = .FALSE.
	345	y_wall_reached = .FALSE.
[2698]	346	z_wall_reached = .FALSE.
[1929]	347	!
	348	!-- Initialize time array
	349	t = 0.0_wp
	350	!
	351	!-- Check if particle can reach any wall. This case, calculate the
	352	!-- fractional time needed to reach this wall. Store this fractional
	353	!-- timestep in array t. Moreover, store indices for these grid
	354	!-- boxes where the respective wall belongs to.
	355	!-- Start with x-direction.
	356	t_index = 1
	357	t(t_index) = ( xwall - pos_x_old ) &
	358	/ MERGE( MAX( prt_x - pos_x_old, 1E-30_wp ), &
	359	MIN( prt_x - pos_x_old, -1E-30_wp ), &
	360	prt_x > pos_x_old )
	361	x_ind(t_index) = i2
	362	y_ind(t_index) = j1
[2698]	363	z_ind(t_index) = k1
[1929]	364	reach_x(t_index) = .TRUE.
	365	reach_y(t_index) = .FALSE.
	366	reach_z(t_index) = .FALSE.
	367	!
	368	!-- Store these values only if particle really reaches any wall. t must
	369	!-- be in a interval between [0:1].
	370	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	371	t_index = t_index + 1
	372	cross_wall_x = .TRUE.
	373	ENDIF
	374	!
	375	!-- y-direction
	376	t(t_index) = ( ywall - pos_y_old ) &
	377	/ MERGE( MAX( prt_y - pos_y_old, 1E-30_wp ), &
	378	MIN( prt_y - pos_y_old, -1E-30_wp ), &
	379	prt_y > pos_y_old )
	380	x_ind(t_index) = i1
	381	y_ind(t_index) = j2
[2698]	382	z_ind(t_index) = k1
[1929]	383	reach_x(t_index) = .FALSE.
	384	reach_y(t_index) = .TRUE.
	385	reach_z(t_index) = .FALSE.
	386	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	387	t_index = t_index + 1
	388	cross_wall_y = .TRUE.
	389	ENDIF
	390	!
	391	!-- z-direction
[2698]	392	t(t_index) = (zwall - pos_z_old ) &
	393	/ MERGE( MAX( prt_z - pos_z_old, 1E-30_wp ), &
	394	MIN( prt_z - pos_z_old, -1E-30_wp ), &
	395	prt_z > pos_z_old )
	396
	397	x_ind(t_index) = i1
	398	y_ind(t_index) = j1
	399	z_ind(t_index) = k2
	400	reach_x(t_index) = .FALSE.
	401	reach_y(t_index) = .FALSE.
	402	reach_z(t_index) = .TRUE.
	403	IF( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp) THEN
	404	t_index = t_index + 1
	405	cross_wall_z = .TRUE.
	406	ENDIF
	407
[1929]	408	t_index_number = t_index - 1
[58]	409	!
[1929]	410	!-- Carry out reflection only if particle reaches any wall
[2698]	411	IF ( cross_wall_x .OR. cross_wall_y .OR. cross_wall_z ) THEN
[58]	412	!
[1929]	413	!-- Sort fractional timesteps in ascending order. Also sort the
	414	!-- corresponding indices and flag according to the time interval a
	415	!-- particle reaches the respective wall.
	416	inc = 1
	417	jr = 1
	418	DO WHILE ( inc <= t_index_number )
	419	inc = 3 * inc + 1
	420	ENDDO
[58]	421
[1929]	422	DO WHILE ( inc > 1 )
	423	inc = inc / 3
	424	DO ir = inc+1, t_index_number
	425	tmp_t = t(ir)
	426	tmp_x = x_ind(ir)
	427	tmp_y = y_ind(ir)
[2698]	428	tmp_z = z_ind(ir)
[1929]	429	tmp_reach_x = reach_x(ir)
	430	tmp_reach_y = reach_y(ir)
	431	tmp_reach_z = reach_z(ir)
	432	jr = ir
	433	DO WHILE ( t(jr-inc) > tmp_t )
	434	t(jr) = t(jr-inc)
	435	x_ind(jr) = x_ind(jr-inc)
	436	y_ind(jr) = y_ind(jr-inc)
[2698]	437	z_ind(jr) = z_ind(jr-inc)
[1929]	438	reach_x(jr) = reach_x(jr-inc)
	439	reach_y(jr) = reach_y(jr-inc)
	440	reach_z(jr) = reach_z(jr-inc)
	441	jr = jr - inc
	442	IF ( jr <= inc ) EXIT
[58]	443	ENDDO
[1929]	444	t(jr) = tmp_t
	445	x_ind(jr) = tmp_x
	446	y_ind(jr) = tmp_y
[2698]	447	z_ind(jr) = tmp_z
[1929]	448	reach_x(jr) = tmp_reach_x
	449	reach_y(jr) = tmp_reach_y
	450	reach_z(jr) = tmp_reach_z
[58]	451	ENDDO
[1929]	452	ENDDO
[58]	453	!
[1929]	454	!-- Initialize temporary particle positions
	455	pos_x = pos_x_old
	456	pos_y = pos_y_old
	457	pos_z = pos_z_old
	458	!
	459	!-- Loop over all times a particle possibly moves into a new grid box
	460	t_old = 0.0_wp
	461	DO t_index = 1, t_index_number
	462	!
	463	!-- Calculate intermediate particle position according to the
	464	!-- timesteps a particle reaches any wall.
	465	pos_x = pos_x + ( t(t_index) - t_old ) * dt_particle &
	466	* particles(n)%speed_x
	467	pos_y = pos_y + ( t(t_index) - t_old ) * dt_particle &
	468	* particles(n)%speed_y
	469	pos_z = pos_z + ( t(t_index) - t_old ) * dt_particle &
	470	* particles(n)%speed_z
	471	!
	472	!-- Obtain x/y grid indices for intermediate particle position from
	473	!-- sorted index array
	474	i3 = x_ind(t_index)
	475	j3 = y_ind(t_index)
[2698]	476	k3 = z_ind(t_index)
[1929]	477	!
	478	!-- Check which wall is already reached
	479	IF ( .NOT. x_wall_reached ) x_wall_reached = reach_x(t_index)
[2698]	480	IF ( .NOT. y_wall_reached ) y_wall_reached = reach_y(t_index)
	481	IF ( .NOT. z_wall_reached ) z_wall_reached = reach_z(t_index)
[1929]	482	!
	483	!-- Check if a particle needs to be reflected at any yz-wall. If
	484	!-- necessary, carry out reflection. Please note, a security
[2698]	485	!-- constant is required, as the particle position does not
[1929]	486	!-- necessarily exactly match the wall location due to rounding
[2698]	487	!-- errors.
	488	IF ( reach_x(t_index) .AND. &
	489	ABS( pos_x - xwall ) < eps .AND. &
	490	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	491	.NOT. reflect_x ) THEN
[2698]	492	!
	493	!
[1929]	494	!-- Reflection in x-direction.
	495	!-- Ensure correct reflection by MIN/MAX functions, depending on
	496	!-- direction of particle transport.
[2698]	497	!-- Due to rounding errors pos_x does not exactly match the wall
[1929]	498	!-- location, leading to erroneous reflection.
	499	pos_x = MERGE( MIN( 2.0_wp * xwall - pos_x, xwall ), &
	500	MAX( 2.0_wp * xwall - pos_x, xwall ), &
	501	particles(n)%x > xwall )
	502	!
	503	!-- Change sign of particle speed
	504	particles(n)%speed_x = - particles(n)%speed_x
	505	!
[2698]	506	!-- Also change sign of subgrid-scale particle speed
[1929]	507	particles(n)%rvar1 = - particles(n)%rvar1
	508	!
	509	!-- Set flag that reflection along x is already done
	510	reflect_x = .TRUE.
	511	!
[2698]	512	!-- As the particle does not cross any further yz-wall during
[1929]	513	!-- this timestep, set further x-indices to the current one.
	514	x_ind(t_index:t_index_number) = i1
	515	!
	516	!-- If particle already reached the wall but was not reflected,
	517	!-- set further x-indices to the new one.
	518	ELSEIF ( x_wall_reached .AND. .NOT. reflect_x ) THEN
	519	x_ind(t_index:t_index_number) = i2
[2698]	520	ENDIF !particle reflection in x direction done
	521
[1929]	522	!
	523	!-- Check if a particle needs to be reflected at any xz-wall. If
[2698]	524	!-- necessary, carry out reflection. Please note, a security
	525	!-- constant is required, as the particle position does not
	526	!-- necessarily exactly match the wall location due to rounding
	527	!-- errors.
	528	WRITE(9,*) 'wall_test_y nysg:',nysg ,' y: ',particles(n)%y,' j3: ',j3,'nyng:', nyng
	529	FLUSH(9)
	530	WRITE(9,*) BTEST(wall_flags_0(k3,j3,i3),0)
	531	FLUSH(9)
	532	IF ( reach_y(t_index) .AND. &
	533	ABS( pos_y - ywall ) < eps .AND. &
	534	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
	535	.NOT. reflect_y ) THEN
	536	!
	537	!
	538	!-- Reflection in y-direction.
	539	!-- Ensure correct reflection by MIN/MAX functions, depending on
	540	!-- direction of particle transport.
	541	!-- Due to rounding errors pos_y does not exactly match the wall
	542	!-- location, leading to erroneous reflection.
[1929]	543	pos_y = MERGE( MIN( 2.0_wp * ywall - pos_y, ywall ), &
	544	MAX( 2.0_wp * ywall - pos_y, ywall ), &
[2698]	545	particles(n)%y > ywall )
	546	!
	547	!-- Change sign of particle speed
	548	particles(n)%speed_y = - particles(n)%speed_y
	549	!
	550	!-- Also change sign of subgrid-scale particle speed
	551	particles(n)%rvar2 = - particles(n)%rvar2
	552	!
	553	!-- Set flag that reflection along y is already done
	554	reflect_y = .TRUE.
	555	!
	556	!-- As the particle does not cross any further xz-wall during
	557	!-- this timestep, set further y-indices to the current one.
[1929]	558	y_ind(t_index:t_index_number) = j1
[2698]	559	!
	560	!-- If particle already reached the wall but was not reflected,
	561	!-- set further y-indices to the new one.
[1929]	562	ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN
[2698]	563	y_ind(t_index:t_index_number) = j2
	564	ENDIF !particle reflection in y direction done
	565
[58]	566	!
[1929]	567	!-- Check if a particle needs to be reflected at any xy-wall. If
[2698]	568	!-- necessary, carry out reflection. Please note, a security
	569	!-- constant is required, as the particle position does not
	570	!-- necessarily exactly match the wall location due to rounding
	571	!-- errors.
	572	IF ( reach_z(t_index) .AND. &
	573	ABS( pos_z - zwall ) < eps .AND. &
	574	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	575	.NOT. reflect_z ) THEN
[2698]	576	!
	577	!
	578	!-- Reflection in z-direction.
	579	!-- Ensure correct reflection by MIN/MAX functions, depending on
	580	!-- direction of particle transport.
	581	!-- Due to rounding errors pos_z does not exactly match the wall
	582	!-- location, leading to erroneous reflection.
	583	pos_z = MERGE( MIN( 2.0_wp * zwall - pos_z, zwall ), &
	584	MAX( 2.0_wp * zwall - pos_z, zwall ), &
	585	particles(n)%z > zwall )
[2232]	586	!
[2698]	587	!-- Change sign of particle speed
	588	particles(n)%speed_z = - particles(n)%speed_z
[58]	589	!
[2698]	590	!-- Also change sign of subgrid-scale particle speed
	591	particles(n)%rvar3 = - particles(n)%rvar3
	592	!
	593	!-- Set flag that reflection along z is already done
	594	reflect_z = .TRUE.
	595	!
	596	!-- As the particle does not cross any further xy-wall during
	597	!-- this timestep, set further z-indices to the current one.
	598	z_ind(t_index:t_index_number) = k1
	599	!
	600	!-- If particle already reached the wall but was not reflected,
	601	!-- set further z-indices to the new one.
	602	ELSEIF ( z_wall_reached .AND. .NOT. reflect_z ) THEN
	603	z_ind(t_index:t_index_number) = k2
	604	ENDIF !particle reflection in z direction done
	605
	606	!
[1929]	607	!-- Swap time
	608	t_old = t(t_index)
[58]	609
[1929]	610	ENDDO
[61]	611	!
[1929]	612	!-- If a particle was reflected, calculate final position from last
	613	!-- intermediate position.
	614	IF ( reflect_x .OR. reflect_y .OR. reflect_z ) THEN
[61]	615
[1929]	616	particles(n)%x = pos_x + ( 1.0_wp - t_old ) * dt_particle &
	617	* particles(n)%speed_x
	618	particles(n)%y = pos_y + ( 1.0_wp - t_old ) * dt_particle &
	619	* particles(n)%speed_y
	620	particles(n)%z = pos_z + ( 1.0_wp - t_old ) * dt_particle &
	621	* particles(n)%speed_z
[61]	622
[849]	623	ENDIF
[61]	624
[1929]	625	ENDIF
[61]	626
[849]	627	ENDDO
[58]	628
[849]	629	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' )
[58]	630
[849]	631	ENDIF
[61]	632
[849]	633	END SUBROUTINE lpm_boundary_conds

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