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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 3236

Last change on this file since 3236 was 3189, checked in by Giersch, 6 years ago
Interpolation to particle position revised, indent revised, bugfix in calculation of the x/y indices for current particle position
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 3189 2018-08-06 13:18:55Z raasch $
[3189]	27	! Bugfix in calculation of the x/y indices for current particle postion
	28	!
	29	! 3067 2018-06-12 14:04:34Z suehring
[3067]	30	! Remove write statements
	31	!
	32	! 2801 2018-02-14 16:01:55Z thiele
[2801]	33	! Introduce particle transfer in nested models.
	34	!
	35	! 2718 2018-01-02 08:49:38Z maronga
[2716]	36	! Corrected "Former revisions" section
	37	!
	38	! 2701 2017-12-15 15:40:50Z suehring
	39	! Changes from last commit documented
	40	!
	41	! 2698 2017-12-14 18:46:24Z suehring
[2698]	42	! Particle reflections at downward-facing walls implemented. Moreover,
	43	! reflections are adjusted to revised particle grid box location.
[2716]	44	! (responsible Philipp Thiele)
	45	!
	46	! 2696 2017-12-14 17:12:51Z kanani
	47	! Change in file header (GPL part)
	48	!
	49	! 2606 2017-11-10 10:36:31Z schwenkel
[2606]	50	! Changed particle box locations: center of particle box now coincides
	51	! with scalar grid point of same index.
	52	! Renamed module and subroutines: lpm_pack_arrays_mod -> lpm_pack_and_sort_mod
	53	! lpm_pack_all_arrays -> lpm_sort_in_subboxes, lpm_pack_arrays -> lpm_pack
	54	! lpm_sort -> lpm_sort_timeloop_done
	55	!
	56	! 2318 2017-07-20 17:27:44Z suehring
[2318]	57	! Get topography top index via Function call
	58	!
	59	! 2317 2017-07-20 17:27:19Z suehring
[1321]	60	!
[2233]	61	! 2232 2017-05-30 17:47:52Z suehring
	62	! Adjustments to new topography and surface concept
	63	! Rename character range into location, as range is an intrinsic.
	64	!
[2001]	65	! 2000 2016-08-20 18:09:15Z knoop
	66	! Forced header and separation lines into 80 columns
	67	!
[1930]	68	! 1929 2016-06-09 16:25:25Z suehring
	69	! Rewritten wall reflection
	70	!
[1823]	71	! 1822 2016-04-07 07:49:42Z hoffmann
	72	! Tails removed. Unused variables removed.
	73	!
[1683]	74	! 1682 2015-10-07 23:56:08Z knoop
	75	! Code annotations made doxygen readable
	76	!
[1360]	77	! 1359 2014-04-11 17:15:14Z hoffmann
	78	! New particle structure integrated.
	79	! Kind definition added to all floating point numbers.
	80	!
[1321]	81	! 1320 2014-03-20 08:40:49Z raasch
[1320]	82	! ONLY-attribute added to USE-statements,
	83	! kind-parameters added to all INTEGER and REAL declaration statements,
	84	! kinds are defined in new module kinds,
	85	! revision history before 2012 removed,
	86	! comment fields (!:) to be used for variable explanations added to
	87	! all variable declaration statements
[58]	88	!
[1037]	89	! 1036 2012-10-22 13:43:42Z raasch
	90	! code put under GPL (PALM 3.9)
	91	!
[850]	92	! 849 2012-03-15 10:35:09Z raasch
	93	! routine renamed lpm_boundary_conds, bottom and top boundary conditions
	94	! included (former part of advec_particles)
	95	!
[826]	96	! 824 2012-02-17 09:09:57Z raasch
	97	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3
	98	!
[58]	99	! Initial version (2007/03/09)
	100	!
	101	! Description:
	102	! ------------
[1682]	103	!> Boundary conditions for the Lagrangian particles.
	104	!> The routine consists of two different parts. One handles the bottom (flat)
	105	!> and top boundary. In this part, also particles which exceeded their lifetime
	106	!> are deleted.
	107	!> The other part handles the reflection of particles from vertical walls.
	108	!> This part was developed by Jin Zhang during 2006-2007.
	109	!>
	110	!> To do: Code structure for finding the t_index values and for checking the
	111	!> ----- reflection conditions is basically the same for all four cases, so it
	112	!> should be possible to further simplify/shorten it.
	113	!>
	114	!> THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!!
	115	!> (see offset_ocean_*)
[58]	116	!------------------------------------------------------------------------------!
[2698]	117	SUBROUTINE lpm_boundary_conds( location , i, j, k )
[1682]	118
[58]	119
[1320]	120	USE arrays_3d, &
	121	ONLY: zu, zw
[58]	122
[1320]	123	USE control_parameters, &
[1822]	124	ONLY: dz, message_string, particle_maximum_age
[58]	125
[1320]	126	USE cpulog, &
	127	ONLY: cpu_log, log_point_s
[849]	128
[1320]	129	USE grid_variables, &
	130	ONLY: ddx, dx, ddy, dy
[58]	131
[1320]	132	USE indices, &
[2698]	133	ONLY: nxl, nxr, nyn, nys, nz, nzb, wall_flags_0,nyng,nysg
[61]	134
[1320]	135	USE kinds
[58]	136
[1320]	137	USE particle_attributes, &
[1822]	138	ONLY: deleted_particles, ibc_par_b, ibc_par_t, number_of_particles, &
	139	particles, particle_type, offset_ocean_nzt_m1, &
	140	use_sgs_for_particles
[60]	141
[1320]	142	USE pegrid
[58]	143
[1320]	144	IMPLICIT NONE
[58]	145
[2232]	146	CHARACTER (LEN=*) :: location !<
[1320]	147
[2698]	148	INTEGER(iwp), INTENT(IN) :: i !<
	149	INTEGER(iwp), INTENT(IN) :: j !<
	150	INTEGER(iwp), INTENT(IN) :: k !<
	151
[1929]	152	INTEGER(iwp) :: inc !< dummy for sorting algorithmus
	153	INTEGER(iwp) :: ir !< dummy for sorting algorithmus
	154	INTEGER(iwp) :: i1 !< grid index (x) of old particle position
	155	INTEGER(iwp) :: i2 !< grid index (x) of current particle position
	156	INTEGER(iwp) :: i3 !< grid index (x) of intermediate particle position
	157	INTEGER(iwp) :: jr !< dummy for sorting algorithmus
	158	INTEGER(iwp) :: j1 !< grid index (y) of old particle position
[2698]	159	INTEGER(iwp) :: j2 !< grid index (y) of current particle position
	160	INTEGER(iwp) :: j3 !< grid index (y) of intermediate particle position
	161	INTEGER(iwp) :: k1 !< grid index (z) of old particle position
	162	INTEGER(iwp) :: k2 !< grid index (z) of current particle position
	163	INTEGER(iwp) :: k3 !< grid index (z) of intermediate particle position
[1929]	164	INTEGER(iwp) :: n !< particle number
	165	INTEGER(iwp) :: t_index !< running index for intermediate particle timesteps in reflection algorithmus
	166	INTEGER(iwp) :: t_index_number !< number of intermediate particle timesteps in reflection algorithmus
[2698]	167	INTEGER(iwp) :: tmp_x !< dummy for sorting algorithm
	168	INTEGER(iwp) :: tmp_y !< dummy for sorting algorithm
	169	INTEGER(iwp) :: tmp_z !< dummy for sorting algorithm
[1929]	170
	171	INTEGER(iwp), DIMENSION(0:10) :: x_ind(0:10) = 0 !< index array (x) of intermediate particle positions
[2698]	172	INTEGER(iwp), DIMENSION(0:10) :: y_ind(0:10) = 0 !< index array (y) of intermediate particle positions
	173	INTEGER(iwp), DIMENSION(0:10) :: z_ind(0:10) = 0 !< index array (z) of intermediate particle positions
[1320]	174
[1929]	175	LOGICAL :: cross_wall_x !< flag to check if particle reflection along x is necessary
	176	LOGICAL :: cross_wall_y !< flag to check if particle reflection along y is necessary
[2698]	177	LOGICAL :: cross_wall_z !< flag to check if particle reflection along z is necessary
[1929]	178	LOGICAL :: reflect_x !< flag to check if particle is already reflected along x
	179	LOGICAL :: reflect_y !< flag to check if particle is already reflected along y
	180	LOGICAL :: reflect_z !< flag to check if particle is already reflected along z
	181	LOGICAL :: tmp_reach_x !< dummy for sorting algorithmus
	182	LOGICAL :: tmp_reach_y !< dummy for sorting algorithmus
	183	LOGICAL :: tmp_reach_z !< dummy for sorting algorithmus
	184	LOGICAL :: x_wall_reached !< flag to check if particle has already reached wall
	185	LOGICAL :: y_wall_reached !< flag to check if particle has already reached wall
[2698]	186	LOGICAL :: z_wall_reached !< flag to check if particle has already reached wall
[1320]	187
[1929]	188	LOGICAL, DIMENSION(0:10) :: reach_x !< flag to check if particle is at a yz-wall
	189	LOGICAL, DIMENSION(0:10) :: reach_y !< flag to check if particle is at a xz-wall
	190	LOGICAL, DIMENSION(0:10) :: reach_z !< flag to check if particle is at a xy-wall
[1320]	191
[1929]	192	REAL(wp) :: dt_particle !< particle timestep
	193	REAL(wp) :: dum !< dummy argument
	194	REAL(wp) :: eps = 1E-10_wp !< security number to check if particle has reached a wall
	195	REAL(wp) :: pos_x !< intermediate particle position (x)
	196	REAL(wp) :: pos_x_old !< particle position (x) at previous particle timestep
	197	REAL(wp) :: pos_y !< intermediate particle position (y)
	198	REAL(wp) :: pos_y_old !< particle position (y) at previous particle timestep
	199	REAL(wp) :: pos_z !< intermediate particle position (z)
	200	REAL(wp) :: pos_z_old !< particle position (z) at previous particle timestep
	201	REAL(wp) :: prt_x !< current particle position (x)
	202	REAL(wp) :: prt_y !< current particle position (y)
	203	REAL(wp) :: prt_z !< current particle position (z)
	204	REAL(wp) :: t_old !< previous reflection time
	205	REAL(wp) :: tmp_t !< dummy for sorting algorithmus
	206	REAL(wp) :: xwall !< location of wall in x
	207	REAL(wp) :: ywall !< location of wall in y
[2698]	208	REAL(wp) :: zwall !< location of wall in z
[1929]	209
	210	REAL(wp), DIMENSION(0:10) :: t !< reflection time
	211
	212
[2232]	213	IF ( location == 'bottom/top' ) THEN
[58]	214
[849]	215	!
	216	!-- Apply boundary conditions to those particles that have crossed the top or
	217	!-- bottom boundary and delete those particles, which are older than allowed
	218	DO n = 1, number_of_particles
[61]	219
[849]	220	!
	221	!-- Stop if particles have moved further than the length of one
	222	!-- PE subdomain (newly released particles have age = age_m!)
	223	IF ( particles(n)%age /= particles(n)%age_m ) THEN
	224	IF ( ABS(particles(n)%speed_x) > &
	225	((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. &
	226	ABS(particles(n)%speed_y) > &
	227	((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN
[60]	228
[849]	229	WRITE( message_string, * ) 'particle too fast. n = ', n
	230	CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 )
	231	ENDIF
	232	ENDIF
[58]	233
[849]	234	IF ( particles(n)%age > particle_maximum_age .AND. &
[1359]	235	particles(n)%particle_mask ) &
[849]	236	THEN
[1359]	237	particles(n)%particle_mask = .FALSE.
[849]	238	deleted_particles = deleted_particles + 1
	239	ENDIF
[58]	240
[2801]	241	IF ( particles(n)%z >= zw(nz) .AND. particles(n)%particle_mask ) THEN
[849]	242	IF ( ibc_par_t == 1 ) THEN
[61]	243	!
[849]	244	!-- Particle absorption
[1359]	245	particles(n)%particle_mask = .FALSE.
[849]	246	deleted_particles = deleted_particles + 1
	247	ELSEIF ( ibc_par_t == 2 ) THEN
	248	!
	249	!-- Particle reflection
[2801]	250	particles(n)%z = 2.0_wp * zw(nz) - particles(n)%z
[849]	251	particles(n)%speed_z = -particles(n)%speed_z
	252	IF ( use_sgs_for_particles .AND. &
[1359]	253	particles(n)%rvar3 > 0.0_wp ) THEN
[849]	254	particles(n)%rvar3 = -particles(n)%rvar3
	255	ENDIF
	256	ENDIF
	257	ENDIF
[1359]	258
	259	IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN
[849]	260	IF ( ibc_par_b == 1 ) THEN
	261	!
	262	!-- Particle absorption
[1359]	263	particles(n)%particle_mask = .FALSE.
[849]	264	deleted_particles = deleted_particles + 1
	265	ELSEIF ( ibc_par_b == 2 ) THEN
	266	!
	267	!-- Particle reflection
[1359]	268	particles(n)%z = 2.0_wp * zw(0) - particles(n)%z
[849]	269	particles(n)%speed_z = -particles(n)%speed_z
	270	IF ( use_sgs_for_particles .AND. &
[1359]	271	particles(n)%rvar3 < 0.0_wp ) THEN
[849]	272	particles(n)%rvar3 = -particles(n)%rvar3
	273	ENDIF
	274	ENDIF
	275	ENDIF
	276	ENDDO
[58]	277
[2232]	278	ELSEIF ( location == 'walls' ) THEN
[58]	279
[1929]	280
[849]	281	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' )
	282
	283	DO n = 1, number_of_particles
[1929]	284	!
	285	!-- Recalculate particle timestep
[849]	286	dt_particle = particles(n)%age - particles(n)%age_m
[1929]	287	!
	288	!-- Obtain x/y indices for current particle position
[2606]	289	i2 = particles(n)%x * ddx
	290	j2 = particles(n)%y * ddy
[2698]	291	IF (zw(k) < particles(n)%z ) k2 = k + 1
[3189]	292	IF (zw(k) > particles(n)%z .AND. zw(k-1) < particles(n)%z ) k2 = k
[2698]	293	IF (zw(k-1) > particles(n)%z ) k2 = k - 1
[1929]	294	!
	295	!-- Save current particle positions
[849]	296	prt_x = particles(n)%x
	297	prt_y = particles(n)%y
	298	prt_z = particles(n)%z
[58]	299	!
[1929]	300	!-- Recalculate old particle positions
	301	pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle
	302	pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle
	303	pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle
[849]	304	!
[1929]	305	!-- Obtain x/y indices for old particle positions
[2698]	306	i1 = i
	307	j1 = j
	308	k1 = k
[58]	309	!
[1929]	310	!-- Determine horizontal as well as vertical walls at which particle can
	311	!-- be potentially reflected.
	312	!-- Start with walls aligned in yz layer.
	313	!-- Wall to the right
	314	IF ( prt_x > pos_x_old ) THEN
[2698]	315	xwall = ( i1 + 1 ) * dx
[1929]	316	!
	317	!-- Wall to the left
	318	ELSE
[2698]	319	xwall = i1 * dx
[1929]	320	ENDIF
	321	!
	322	!-- Walls aligned in xz layer
	323	!-- Wall to the north
	324	IF ( prt_y > pos_y_old ) THEN
[2698]	325	ywall = ( j1 +1 ) * dy
[1929]	326	!-- Wall to the south
	327	ELSE
[2698]	328	ywall = j1 * dy
[1929]	329	ENDIF
[2698]	330
	331	IF ( prt_z > pos_z_old ) THEN
	332	zwall = zw(k)
	333	ELSE
	334	zwall = zw(k-1)
	335	ENDIF
[1929]	336	!
	337	!-- Initialize flags to check if particle reflection is necessary
	338	cross_wall_x = .FALSE.
	339	cross_wall_y = .FALSE.
[2698]	340	cross_wall_z = .FALSE.
[1929]	341	!
	342	!-- Initialize flags to check if a wall is reached
	343	reach_x = .FALSE.
	344	reach_y = .FALSE.
	345	reach_z = .FALSE.
	346	!
	347	!-- Initialize flags to check if a particle was already reflected
[2698]	348	reflect_x = .FALSE.
	349	reflect_y = .FALSE.
	350	reflect_z = .FALSE.
[1929]	351	!
[2698]	352	!-- Initialize flags to check if a wall is already crossed.
[1929]	353	!-- ( Required to obtain correct indices. )
	354	x_wall_reached = .FALSE.
	355	y_wall_reached = .FALSE.
[2698]	356	z_wall_reached = .FALSE.
[1929]	357	!
	358	!-- Initialize time array
	359	t = 0.0_wp
	360	!
	361	!-- Check if particle can reach any wall. This case, calculate the
	362	!-- fractional time needed to reach this wall. Store this fractional
	363	!-- timestep in array t. Moreover, store indices for these grid
	364	!-- boxes where the respective wall belongs to.
	365	!-- Start with x-direction.
	366	t_index = 1
	367	t(t_index) = ( xwall - pos_x_old ) &
	368	/ MERGE( MAX( prt_x - pos_x_old, 1E-30_wp ), &
	369	MIN( prt_x - pos_x_old, -1E-30_wp ), &
	370	prt_x > pos_x_old )
	371	x_ind(t_index) = i2
	372	y_ind(t_index) = j1
[2698]	373	z_ind(t_index) = k1
[1929]	374	reach_x(t_index) = .TRUE.
	375	reach_y(t_index) = .FALSE.
	376	reach_z(t_index) = .FALSE.
	377	!
	378	!-- Store these values only if particle really reaches any wall. t must
	379	!-- be in a interval between [0:1].
	380	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	381	t_index = t_index + 1
	382	cross_wall_x = .TRUE.
	383	ENDIF
	384	!
	385	!-- y-direction
	386	t(t_index) = ( ywall - pos_y_old ) &
	387	/ MERGE( MAX( prt_y - pos_y_old, 1E-30_wp ), &
	388	MIN( prt_y - pos_y_old, -1E-30_wp ), &
	389	prt_y > pos_y_old )
	390	x_ind(t_index) = i1
	391	y_ind(t_index) = j2
[2698]	392	z_ind(t_index) = k1
[1929]	393	reach_x(t_index) = .FALSE.
	394	reach_y(t_index) = .TRUE.
	395	reach_z(t_index) = .FALSE.
	396	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	397	t_index = t_index + 1
	398	cross_wall_y = .TRUE.
	399	ENDIF
	400	!
	401	!-- z-direction
[2698]	402	t(t_index) = (zwall - pos_z_old ) &
	403	/ MERGE( MAX( prt_z - pos_z_old, 1E-30_wp ), &
	404	MIN( prt_z - pos_z_old, -1E-30_wp ), &
	405	prt_z > pos_z_old )
	406
	407	x_ind(t_index) = i1
	408	y_ind(t_index) = j1
	409	z_ind(t_index) = k2
	410	reach_x(t_index) = .FALSE.
	411	reach_y(t_index) = .FALSE.
	412	reach_z(t_index) = .TRUE.
	413	IF( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp) THEN
	414	t_index = t_index + 1
	415	cross_wall_z = .TRUE.
	416	ENDIF
	417
[1929]	418	t_index_number = t_index - 1
[58]	419	!
[1929]	420	!-- Carry out reflection only if particle reaches any wall
[2698]	421	IF ( cross_wall_x .OR. cross_wall_y .OR. cross_wall_z ) THEN
[58]	422	!
[1929]	423	!-- Sort fractional timesteps in ascending order. Also sort the
	424	!-- corresponding indices and flag according to the time interval a
	425	!-- particle reaches the respective wall.
	426	inc = 1
	427	jr = 1
	428	DO WHILE ( inc <= t_index_number )
	429	inc = 3 * inc + 1
	430	ENDDO
[58]	431
[1929]	432	DO WHILE ( inc > 1 )
	433	inc = inc / 3
	434	DO ir = inc+1, t_index_number
	435	tmp_t = t(ir)
	436	tmp_x = x_ind(ir)
	437	tmp_y = y_ind(ir)
[2698]	438	tmp_z = z_ind(ir)
[1929]	439	tmp_reach_x = reach_x(ir)
	440	tmp_reach_y = reach_y(ir)
	441	tmp_reach_z = reach_z(ir)
	442	jr = ir
	443	DO WHILE ( t(jr-inc) > tmp_t )
	444	t(jr) = t(jr-inc)
	445	x_ind(jr) = x_ind(jr-inc)
	446	y_ind(jr) = y_ind(jr-inc)
[2698]	447	z_ind(jr) = z_ind(jr-inc)
[1929]	448	reach_x(jr) = reach_x(jr-inc)
	449	reach_y(jr) = reach_y(jr-inc)
	450	reach_z(jr) = reach_z(jr-inc)
	451	jr = jr - inc
	452	IF ( jr <= inc ) EXIT
[58]	453	ENDDO
[1929]	454	t(jr) = tmp_t
	455	x_ind(jr) = tmp_x
	456	y_ind(jr) = tmp_y
[2698]	457	z_ind(jr) = tmp_z
[1929]	458	reach_x(jr) = tmp_reach_x
	459	reach_y(jr) = tmp_reach_y
	460	reach_z(jr) = tmp_reach_z
[58]	461	ENDDO
[1929]	462	ENDDO
[58]	463	!
[1929]	464	!-- Initialize temporary particle positions
	465	pos_x = pos_x_old
	466	pos_y = pos_y_old
	467	pos_z = pos_z_old
	468	!
	469	!-- Loop over all times a particle possibly moves into a new grid box
	470	t_old = 0.0_wp
	471	DO t_index = 1, t_index_number
	472	!
	473	!-- Calculate intermediate particle position according to the
	474	!-- timesteps a particle reaches any wall.
	475	pos_x = pos_x + ( t(t_index) - t_old ) * dt_particle &
	476	* particles(n)%speed_x
	477	pos_y = pos_y + ( t(t_index) - t_old ) * dt_particle &
	478	* particles(n)%speed_y
	479	pos_z = pos_z + ( t(t_index) - t_old ) * dt_particle &
	480	* particles(n)%speed_z
	481	!
	482	!-- Obtain x/y grid indices for intermediate particle position from
	483	!-- sorted index array
	484	i3 = x_ind(t_index)
	485	j3 = y_ind(t_index)
[2698]	486	k3 = z_ind(t_index)
[1929]	487	!
	488	!-- Check which wall is already reached
	489	IF ( .NOT. x_wall_reached ) x_wall_reached = reach_x(t_index)
[2698]	490	IF ( .NOT. y_wall_reached ) y_wall_reached = reach_y(t_index)
	491	IF ( .NOT. z_wall_reached ) z_wall_reached = reach_z(t_index)
[1929]	492	!
	493	!-- Check if a particle needs to be reflected at any yz-wall. If
	494	!-- necessary, carry out reflection. Please note, a security
[2698]	495	!-- constant is required, as the particle position does not
[1929]	496	!-- necessarily exactly match the wall location due to rounding
[2698]	497	!-- errors.
	498	IF ( reach_x(t_index) .AND. &
	499	ABS( pos_x - xwall ) < eps .AND. &
	500	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	501	.NOT. reflect_x ) THEN
[2698]	502	!
	503	!
[1929]	504	!-- Reflection in x-direction.
	505	!-- Ensure correct reflection by MIN/MAX functions, depending on
	506	!-- direction of particle transport.
[2698]	507	!-- Due to rounding errors pos_x does not exactly match the wall
[1929]	508	!-- location, leading to erroneous reflection.
	509	pos_x = MERGE( MIN( 2.0_wp * xwall - pos_x, xwall ), &
	510	MAX( 2.0_wp * xwall - pos_x, xwall ), &
	511	particles(n)%x > xwall )
	512	!
	513	!-- Change sign of particle speed
	514	particles(n)%speed_x = - particles(n)%speed_x
	515	!
[2698]	516	!-- Also change sign of subgrid-scale particle speed
[1929]	517	particles(n)%rvar1 = - particles(n)%rvar1
	518	!
	519	!-- Set flag that reflection along x is already done
	520	reflect_x = .TRUE.
	521	!
[2698]	522	!-- As the particle does not cross any further yz-wall during
[1929]	523	!-- this timestep, set further x-indices to the current one.
	524	x_ind(t_index:t_index_number) = i1
	525	!
	526	!-- If particle already reached the wall but was not reflected,
	527	!-- set further x-indices to the new one.
	528	ELSEIF ( x_wall_reached .AND. .NOT. reflect_x ) THEN
	529	x_ind(t_index:t_index_number) = i2
[2698]	530	ENDIF !particle reflection in x direction done
	531
[1929]	532	!
	533	!-- Check if a particle needs to be reflected at any xz-wall. If
[2698]	534	!-- necessary, carry out reflection. Please note, a security
	535	!-- constant is required, as the particle position does not
	536	!-- necessarily exactly match the wall location due to rounding
	537	!-- errors.
	538	IF ( reach_y(t_index) .AND. &
	539	ABS( pos_y - ywall ) < eps .AND. &
	540	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
	541	.NOT. reflect_y ) THEN
	542	!
	543	!
	544	!-- Reflection in y-direction.
	545	!-- Ensure correct reflection by MIN/MAX functions, depending on
	546	!-- direction of particle transport.
	547	!-- Due to rounding errors pos_y does not exactly match the wall
	548	!-- location, leading to erroneous reflection.
[1929]	549	pos_y = MERGE( MIN( 2.0_wp * ywall - pos_y, ywall ), &
	550	MAX( 2.0_wp * ywall - pos_y, ywall ), &
[2698]	551	particles(n)%y > ywall )
	552	!
	553	!-- Change sign of particle speed
	554	particles(n)%speed_y = - particles(n)%speed_y
	555	!
	556	!-- Also change sign of subgrid-scale particle speed
	557	particles(n)%rvar2 = - particles(n)%rvar2
	558	!
	559	!-- Set flag that reflection along y is already done
	560	reflect_y = .TRUE.
	561	!
	562	!-- As the particle does not cross any further xz-wall during
	563	!-- this timestep, set further y-indices to the current one.
[1929]	564	y_ind(t_index:t_index_number) = j1
[2698]	565	!
	566	!-- If particle already reached the wall but was not reflected,
	567	!-- set further y-indices to the new one.
[1929]	568	ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN
[2698]	569	y_ind(t_index:t_index_number) = j2
	570	ENDIF !particle reflection in y direction done
	571
[58]	572	!
[1929]	573	!-- Check if a particle needs to be reflected at any xy-wall. If
[2698]	574	!-- necessary, carry out reflection. Please note, a security
	575	!-- constant is required, as the particle position does not
	576	!-- necessarily exactly match the wall location due to rounding
	577	!-- errors.
	578	IF ( reach_z(t_index) .AND. &
	579	ABS( pos_z - zwall ) < eps .AND. &
	580	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	581	.NOT. reflect_z ) THEN
[2698]	582	!
	583	!
	584	!-- Reflection in z-direction.
	585	!-- Ensure correct reflection by MIN/MAX functions, depending on
	586	!-- direction of particle transport.
	587	!-- Due to rounding errors pos_z does not exactly match the wall
	588	!-- location, leading to erroneous reflection.
	589	pos_z = MERGE( MIN( 2.0_wp * zwall - pos_z, zwall ), &
	590	MAX( 2.0_wp * zwall - pos_z, zwall ), &
	591	particles(n)%z > zwall )
[2232]	592	!
[2698]	593	!-- Change sign of particle speed
	594	particles(n)%speed_z = - particles(n)%speed_z
[58]	595	!
[2698]	596	!-- Also change sign of subgrid-scale particle speed
	597	particles(n)%rvar3 = - particles(n)%rvar3
	598	!
	599	!-- Set flag that reflection along z is already done
	600	reflect_z = .TRUE.
	601	!
	602	!-- As the particle does not cross any further xy-wall during
	603	!-- this timestep, set further z-indices to the current one.
	604	z_ind(t_index:t_index_number) = k1
	605	!
	606	!-- If particle already reached the wall but was not reflected,
	607	!-- set further z-indices to the new one.
	608	ELSEIF ( z_wall_reached .AND. .NOT. reflect_z ) THEN
	609	z_ind(t_index:t_index_number) = k2
	610	ENDIF !particle reflection in z direction done
	611
	612	!
[1929]	613	!-- Swap time
	614	t_old = t(t_index)
[58]	615
[1929]	616	ENDDO
[61]	617	!
[1929]	618	!-- If a particle was reflected, calculate final position from last
	619	!-- intermediate position.
	620	IF ( reflect_x .OR. reflect_y .OR. reflect_z ) THEN
[61]	621
[1929]	622	particles(n)%x = pos_x + ( 1.0_wp - t_old ) * dt_particle &
	623	* particles(n)%speed_x
	624	particles(n)%y = pos_y + ( 1.0_wp - t_old ) * dt_particle &
	625	* particles(n)%speed_y
	626	particles(n)%z = pos_z + ( 1.0_wp - t_old ) * dt_particle &
	627	* particles(n)%speed_z
[61]	628
[849]	629	ENDIF
[61]	630
[1929]	631	ENDIF
[61]	632
[849]	633	ENDDO
[58]	634
[849]	635	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' )
[58]	636
[849]	637	ENDIF
[61]	638
[849]	639	END SUBROUTINE lpm_boundary_conds

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