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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 1935

Last change on this file since 1935 was 1930, checked in by suehring, 8 years ago
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[1682]	1	!> @file lpm_boundary_conds.f90
[1036]	2	!--------------------------------------------------------------------------------!
	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1818]	16	! Copyright 1997-2016 Leibniz Universitaet Hannover
[1036]	17	!--------------------------------------------------------------------------------!
	18	!
[484]	19	! Current revisions:
[58]	20	! -----------------
[1360]	21	!
[1930]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: lpm_boundary_conds.f90 1930 2016-06-09 16:32:12Z hellstea $
	26	!
[1930]	27	! 1929 2016-06-09 16:25:25Z suehring
	28	! Rewritten wall reflection
	29	!
[1823]	30	! 1822 2016-04-07 07:49:42Z hoffmann
	31	! Tails removed. Unused variables removed.
	32	!
[1683]	33	! 1682 2015-10-07 23:56:08Z knoop
	34	! Code annotations made doxygen readable
	35	!
[1360]	36	! 1359 2014-04-11 17:15:14Z hoffmann
	37	! New particle structure integrated.
	38	! Kind definition added to all floating point numbers.
	39	!
[1321]	40	! 1320 2014-03-20 08:40:49Z raasch
[1320]	41	! ONLY-attribute added to USE-statements,
	42	! kind-parameters added to all INTEGER and REAL declaration statements,
	43	! kinds are defined in new module kinds,
	44	! revision history before 2012 removed,
	45	! comment fields (!:) to be used for variable explanations added to
	46	! all variable declaration statements
[58]	47	!
[1037]	48	! 1036 2012-10-22 13:43:42Z raasch
	49	! code put under GPL (PALM 3.9)
	50	!
[850]	51	! 849 2012-03-15 10:35:09Z raasch
	52	! routine renamed lpm_boundary_conds, bottom and top boundary conditions
	53	! included (former part of advec_particles)
	54	!
[826]	55	! 824 2012-02-17 09:09:57Z raasch
	56	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3
	57	!
[58]	58	! Initial version (2007/03/09)
	59	!
	60	! Description:
	61	! ------------
[1682]	62	!> Boundary conditions for the Lagrangian particles.
	63	!> The routine consists of two different parts. One handles the bottom (flat)
	64	!> and top boundary. In this part, also particles which exceeded their lifetime
	65	!> are deleted.
	66	!> The other part handles the reflection of particles from vertical walls.
	67	!> This part was developed by Jin Zhang during 2006-2007.
	68	!>
	69	!> To do: Code structure for finding the t_index values and for checking the
	70	!> ----- reflection conditions is basically the same for all four cases, so it
	71	!> should be possible to further simplify/shorten it.
	72	!>
	73	!> THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!!
	74	!> (see offset_ocean_*)
[58]	75	!------------------------------------------------------------------------------!
[1682]	76	SUBROUTINE lpm_boundary_conds( range )
	77
[58]	78
[1320]	79	USE arrays_3d, &
	80	ONLY: zu, zw
[58]	81
[1320]	82	USE control_parameters, &
[1822]	83	ONLY: dz, message_string, particle_maximum_age
[58]	84
[1320]	85	USE cpulog, &
	86	ONLY: cpu_log, log_point_s
[849]	87
[1320]	88	USE grid_variables, &
	89	ONLY: ddx, dx, ddy, dy
[58]	90
[1320]	91	USE indices, &
	92	ONLY: nxl, nxr, nyn, nys, nz, nzb_s_inner
[61]	93
[1320]	94	USE kinds
[58]	95
[1320]	96	USE particle_attributes, &
[1822]	97	ONLY: deleted_particles, ibc_par_b, ibc_par_t, number_of_particles, &
	98	particles, particle_type, offset_ocean_nzt_m1, &
	99	use_sgs_for_particles
[60]	100
[1320]	101	USE pegrid
[58]	102
[1320]	103	IMPLICIT NONE
[58]	104
[1682]	105	CHARACTER (LEN=*) :: range !<
[1320]	106
[1929]	107	INTEGER(iwp) :: inc !< dummy for sorting algorithmus
	108	INTEGER(iwp) :: ir !< dummy for sorting algorithmus
	109	INTEGER(iwp) :: i1 !< grid index (x) of old particle position
	110	INTEGER(iwp) :: i2 !< grid index (x) of current particle position
	111	INTEGER(iwp) :: i3 !< grid index (x) of intermediate particle position
	112	INTEGER(iwp) :: jr !< dummy for sorting algorithmus
	113	INTEGER(iwp) :: j1 !< grid index (y) of old particle position
	114	INTEGER(iwp) :: j2 !< grid index (x) of current particle position
	115	INTEGER(iwp) :: j3 !< grid index (x) of intermediate particle position
	116	INTEGER(iwp) :: n !< particle number
	117	INTEGER(iwp) :: t_index !< running index for intermediate particle timesteps in reflection algorithmus
	118	INTEGER(iwp) :: t_index_number !< number of intermediate particle timesteps in reflection algorithmus
	119	INTEGER(iwp) :: tmp_x !< dummy for sorting algorithmus
	120	INTEGER(iwp) :: tmp_y !< dummy for sorting algorithmus
	121
	122	INTEGER(iwp), DIMENSION(0:10) :: x_ind(0:10) = 0 !< index array (x) of intermediate particle positions
	123	INTEGER(iwp), DIMENSION(0:10) :: y_ind(0:10) = 0 !< index array (x) of intermediate particle positions
[1320]	124
[1929]	125	LOGICAL :: cross_wall_x !< flag to check if particle reflection along x is necessary
	126	LOGICAL :: cross_wall_y !< flag to check if particle reflection along y is necessary
	127	LOGICAL :: downwards !< flag to check if particle reflection along z is necessary (only if particle move downwards)
	128	LOGICAL :: reflect_x !< flag to check if particle is already reflected along x
	129	LOGICAL :: reflect_y !< flag to check if particle is already reflected along y
	130	LOGICAL :: reflect_z !< flag to check if particle is already reflected along z
	131	LOGICAL :: tmp_reach_x !< dummy for sorting algorithmus
	132	LOGICAL :: tmp_reach_y !< dummy for sorting algorithmus
	133	LOGICAL :: tmp_reach_z !< dummy for sorting algorithmus
	134	LOGICAL :: x_wall_reached !< flag to check if particle has already reached wall
	135	LOGICAL :: y_wall_reached !< flag to check if particle has already reached wall
[1320]	136
[1929]	137	LOGICAL, DIMENSION(0:10) :: reach_x !< flag to check if particle is at a yz-wall
	138	LOGICAL, DIMENSION(0:10) :: reach_y !< flag to check if particle is at a xz-wall
	139	LOGICAL, DIMENSION(0:10) :: reach_z !< flag to check if particle is at a xy-wall
[1320]	140
[1929]	141	REAL(wp) :: dt_particle !< particle timestep
	142	REAL(wp) :: dum !< dummy argument
	143	REAL(wp) :: eps = 1E-10_wp !< security number to check if particle has reached a wall
	144	REAL(wp) :: pos_x !< intermediate particle position (x)
	145	REAL(wp) :: pos_x_old !< particle position (x) at previous particle timestep
	146	REAL(wp) :: pos_y !< intermediate particle position (y)
	147	REAL(wp) :: pos_y_old !< particle position (y) at previous particle timestep
	148	REAL(wp) :: pos_z !< intermediate particle position (z)
	149	REAL(wp) :: pos_z_old !< particle position (z) at previous particle timestep
	150	REAL(wp) :: prt_x !< current particle position (x)
	151	REAL(wp) :: prt_y !< current particle position (y)
	152	REAL(wp) :: prt_z !< current particle position (z)
	153	REAL(wp) :: t_old !< previous reflection time
	154	REAL(wp) :: tmp_t !< dummy for sorting algorithmus
	155	REAL(wp) :: xwall !< location of wall in x
	156	REAL(wp) :: ywall !< location of wall in y
	157	REAL(wp) :: zwall1 !< location of wall in z (old grid box)
	158	REAL(wp) :: zwall2 !< location of wall in z (current grid box)
	159	REAL(wp) :: zwall3 !< location of wall in z (old y, current x)
	160	REAL(wp) :: zwall4 !< location of wall in z (current y, old x)
	161
	162	REAL(wp), DIMENSION(0:10) :: t !< reflection time
	163
	164
[849]	165	IF ( range == 'bottom/top' ) THEN
[58]	166
[849]	167	!
	168	!-- Apply boundary conditions to those particles that have crossed the top or
	169	!-- bottom boundary and delete those particles, which are older than allowed
	170	DO n = 1, number_of_particles
[61]	171
[849]	172	!
	173	!-- Stop if particles have moved further than the length of one
	174	!-- PE subdomain (newly released particles have age = age_m!)
	175	IF ( particles(n)%age /= particles(n)%age_m ) THEN
	176	IF ( ABS(particles(n)%speed_x) > &
	177	((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. &
	178	ABS(particles(n)%speed_y) > &
	179	((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN
[60]	180
[849]	181	WRITE( message_string, * ) 'particle too fast. n = ', n
	182	CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 )
	183	ENDIF
	184	ENDIF
[58]	185
[849]	186	IF ( particles(n)%age > particle_maximum_age .AND. &
[1359]	187	particles(n)%particle_mask ) &
[849]	188	THEN
[1359]	189	particles(n)%particle_mask = .FALSE.
[849]	190	deleted_particles = deleted_particles + 1
	191	ENDIF
[58]	192
[1359]	193	IF ( particles(n)%z >= zu(nz) .AND. particles(n)%particle_mask ) THEN
[849]	194	IF ( ibc_par_t == 1 ) THEN
[61]	195	!
[849]	196	!-- Particle absorption
[1359]	197	particles(n)%particle_mask = .FALSE.
[849]	198	deleted_particles = deleted_particles + 1
	199	ELSEIF ( ibc_par_t == 2 ) THEN
	200	!
	201	!-- Particle reflection
[1359]	202	particles(n)%z = 2.0_wp * zu(nz) - particles(n)%z
[849]	203	particles(n)%speed_z = -particles(n)%speed_z
	204	IF ( use_sgs_for_particles .AND. &
[1359]	205	particles(n)%rvar3 > 0.0_wp ) THEN
[849]	206	particles(n)%rvar3 = -particles(n)%rvar3
	207	ENDIF
	208	ENDIF
	209	ENDIF
[1359]	210
	211	IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN
[849]	212	IF ( ibc_par_b == 1 ) THEN
	213	!
	214	!-- Particle absorption
[1359]	215	particles(n)%particle_mask = .FALSE.
[849]	216	deleted_particles = deleted_particles + 1
	217	ELSEIF ( ibc_par_b == 2 ) THEN
	218	!
	219	!-- Particle reflection
[1359]	220	particles(n)%z = 2.0_wp * zw(0) - particles(n)%z
[849]	221	particles(n)%speed_z = -particles(n)%speed_z
	222	IF ( use_sgs_for_particles .AND. &
[1359]	223	particles(n)%rvar3 < 0.0_wp ) THEN
[849]	224	particles(n)%rvar3 = -particles(n)%rvar3
	225	ENDIF
	226	ENDIF
	227	ENDIF
	228	ENDDO
[58]	229
[849]	230	ELSEIF ( range == 'walls' ) THEN
[58]	231
[1929]	232
[849]	233	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' )
	234
	235	DO n = 1, number_of_particles
[1929]	236	!
	237	!-- Recalculate particle timestep
[849]	238	dt_particle = particles(n)%age - particles(n)%age_m
[1929]	239	!
	240	!-- Obtain x/y indices for current particle position
[1359]	241	i2 = ( particles(n)%x + 0.5_wp * dx ) * ddx
	242	j2 = ( particles(n)%y + 0.5_wp * dy ) * ddy
[1929]	243	!
	244	!-- Save current particle positions
[849]	245	prt_x = particles(n)%x
	246	prt_y = particles(n)%y
	247	prt_z = particles(n)%z
[58]	248	!
[1929]	249	!-- Recalculate old particle positions
	250	pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle
	251	pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle
	252	pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle
[849]	253	!
[1929]	254	!-- Obtain x/y indices for old particle positions
	255	i1 = ( pos_x_old + 0.5_wp * dx ) * ddx
	256	j1 = ( pos_y_old + 0.5_wp * dy ) * ddy
[58]	257	!
[1929]	258	!-- Determine horizontal as well as vertical walls at which particle can
	259	!-- be potentially reflected.
	260	!-- Start with walls aligned in yz layer.
	261	!-- Wall to the right
	262	IF ( prt_x > pos_x_old ) THEN
	263	xwall = ( i1 + 0.5_wp ) * dx
	264	!
	265	!-- Wall to the left
	266	ELSE
	267	xwall = ( i1 - 0.5_wp ) * dx
	268	ENDIF
	269	!
	270	!-- Walls aligned in xz layer
	271	!-- Wall to the north
	272	IF ( prt_y > pos_y_old ) THEN
	273	ywall = ( j1 + 0.5_wp ) * dy
	274	!-- Wall to the south
	275	ELSE
	276	ywall = ( j1 - 0.5_wp ) * dy
	277	ENDIF
	278	!
	279	!-- Walls aligned in xy layer at which particle can be possiblly reflected
	280	zwall1 = zw(nzb_s_inner(j2,i2))
	281	zwall2 = zw(nzb_s_inner(j1,i1))
	282	zwall3 = zw(nzb_s_inner(j1,i2))
	283	zwall4 = zw(nzb_s_inner(j2,i1))
	284	!
	285	!-- Initialize flags to check if particle reflection is necessary
	286	downwards = .FALSE.
	287	cross_wall_x = .FALSE.
	288	cross_wall_y = .FALSE.
	289	!
	290	!-- Initialize flags to check if a wall is reached
	291	reach_x = .FALSE.
	292	reach_y = .FALSE.
	293	reach_z = .FALSE.
	294	!
	295	!-- Initialize flags to check if a particle was already reflected
	296	reflect_x = .FALSE.
	297	reflect_y = .FALSE.
	298	reflect_z = .FALSE.
	299	!
	300	!-- Initialize flags to check if a vertical wall is already crossed.
	301	!-- ( Required to obtain correct indices. )
	302	x_wall_reached = .FALSE.
	303	y_wall_reached = .FALSE.
	304	!
	305	!-- Initialize time array
	306	t = 0.0_wp
	307	!
	308	!-- Check if particle can reach any wall. This case, calculate the
	309	!-- fractional time needed to reach this wall. Store this fractional
	310	!-- timestep in array t. Moreover, store indices for these grid
	311	!-- boxes where the respective wall belongs to.
	312	!-- Start with x-direction.
	313	t_index = 1
	314	t(t_index) = ( xwall - pos_x_old ) &
	315	/ MERGE( MAX( prt_x - pos_x_old, 1E-30_wp ), &
	316	MIN( prt_x - pos_x_old, -1E-30_wp ), &
	317	prt_x > pos_x_old )
	318	x_ind(t_index) = i2
	319	y_ind(t_index) = j1
	320	reach_x(t_index) = .TRUE.
	321	reach_y(t_index) = .FALSE.
	322	reach_z(t_index) = .FALSE.
	323	!
	324	!-- Store these values only if particle really reaches any wall. t must
	325	!-- be in a interval between [0:1].
	326	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	327	t_index = t_index + 1
	328	cross_wall_x = .TRUE.
	329	ENDIF
	330	!
	331	!-- y-direction
	332	t(t_index) = ( ywall - pos_y_old ) &
	333	/ MERGE( MAX( prt_y - pos_y_old, 1E-30_wp ), &
	334	MIN( prt_y - pos_y_old, -1E-30_wp ), &
	335	prt_y > pos_y_old )
	336	x_ind(t_index) = i1
	337	y_ind(t_index) = j2
	338	reach_x(t_index) = .FALSE.
	339	reach_y(t_index) = .TRUE.
	340	reach_z(t_index) = .FALSE.
	341	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	342	t_index = t_index + 1
	343	cross_wall_y = .TRUE.
	344	ENDIF
	345	!
	346	!-- z-direction
	347	!-- At first, check if particle moves downwards. Only in this case a
	348	!-- particle can be reflected vertically.
	349	IF ( prt_z < pos_z_old ) THEN
[58]	350
[1929]	351	downwards = .TRUE.
	352	dum = 1.0_wp / MERGE( MAX( prt_z - pos_z_old, 1E-30_wp ), &
	353	MIN( prt_z - pos_z_old, -1E-30_wp ), &
	354	prt_z > pos_z_old )
[58]	355
[1929]	356	t(t_index) = ( zwall1 - pos_z_old ) * dum
	357	x_ind(t_index) = i2
	358	y_ind(t_index) = j2
	359	reach_x(t_index) = .FALSE.
	360	reach_y(t_index) = .FALSE.
	361	reach_z(t_index) = .TRUE.
	362	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) &
	363	t_index = t_index + 1
[58]	364
[1929]	365	reach_x(t_index) = .FALSE.
	366	reach_y(t_index) = .FALSE.
	367	reach_z(t_index) = .TRUE.
	368	t(t_index) = ( zwall2 - pos_z_old ) * dum
	369	x_ind(t_index) = i1
	370	y_ind(t_index) = j1
	371	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) &
	372	t_index = t_index + 1
[58]	373
[1929]	374	reach_x(t_index) = .FALSE.
	375	reach_y(t_index) = .FALSE.
	376	reach_z(t_index) = .TRUE.
	377	t(t_index) = ( zwall3 - pos_z_old ) * dum
	378	x_ind(t_index) = i2
	379	y_ind(t_index) = j1
	380	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) &
	381	t_index = t_index + 1
[58]	382
[1929]	383	reach_x(t_index) = .FALSE.
	384	reach_y(t_index) = .FALSE.
	385	reach_z(t_index) = .TRUE.
	386	t(t_index) = ( zwall4 - pos_z_old ) * dum
	387	x_ind(t_index) = i1
	388	y_ind(t_index) = j2
	389	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) &
	390	t_index = t_index + 1
[58]	391
[1929]	392	END IF
	393	t_index_number = t_index - 1
[58]	394	!
[1929]	395	!-- Carry out reflection only if particle reaches any wall
	396	IF ( cross_wall_x .OR. cross_wall_y .OR. downwards ) THEN
[58]	397	!
[1929]	398	!-- Sort fractional timesteps in ascending order. Also sort the
	399	!-- corresponding indices and flag according to the time interval a
	400	!-- particle reaches the respective wall.
	401	inc = 1
	402	jr = 1
	403	DO WHILE ( inc <= t_index_number )
	404	inc = 3 * inc + 1
	405	ENDDO
[58]	406
[1929]	407	DO WHILE ( inc > 1 )
	408	inc = inc / 3
	409	DO ir = inc+1, t_index_number
	410	tmp_t = t(ir)
	411	tmp_x = x_ind(ir)
	412	tmp_y = y_ind(ir)
	413	tmp_reach_x = reach_x(ir)
	414	tmp_reach_y = reach_y(ir)
	415	tmp_reach_z = reach_z(ir)
	416	jr = ir
	417	DO WHILE ( t(jr-inc) > tmp_t )
	418	t(jr) = t(jr-inc)
	419	x_ind(jr) = x_ind(jr-inc)
	420	y_ind(jr) = y_ind(jr-inc)
	421	reach_x(jr) = reach_x(jr-inc)
	422	reach_y(jr) = reach_y(jr-inc)
	423	reach_z(jr) = reach_z(jr-inc)
	424	jr = jr - inc
	425	IF ( jr <= inc ) EXIT
[58]	426	ENDDO
[1929]	427	t(jr) = tmp_t
	428	x_ind(jr) = tmp_x
	429	y_ind(jr) = tmp_y
	430	reach_x(jr) = tmp_reach_x
	431	reach_y(jr) = tmp_reach_y
	432	reach_z(jr) = tmp_reach_z
[58]	433	ENDDO
[1929]	434	ENDDO
[58]	435	!
[1929]	436	!-- Initialize temporary particle positions
	437	pos_x = pos_x_old
	438	pos_y = pos_y_old
	439	pos_z = pos_z_old
	440	!
	441	!-- Loop over all times a particle possibly moves into a new grid box
	442	t_old = 0.0_wp
	443	DO t_index = 1, t_index_number
	444	!
	445	!-- Calculate intermediate particle position according to the
	446	!-- timesteps a particle reaches any wall.
	447	pos_x = pos_x + ( t(t_index) - t_old ) * dt_particle &
	448	* particles(n)%speed_x
	449	pos_y = pos_y + ( t(t_index) - t_old ) * dt_particle &
	450	* particles(n)%speed_y
	451	pos_z = pos_z + ( t(t_index) - t_old ) * dt_particle &
	452	* particles(n)%speed_z
	453	!
	454	!-- Obtain x/y grid indices for intermediate particle position from
	455	!-- sorted index array
	456	i3 = x_ind(t_index)
	457	j3 = y_ind(t_index)
	458	!
	459	!-- Check which wall is already reached
	460	IF ( .NOT. x_wall_reached ) x_wall_reached = reach_x(t_index)
	461	IF ( .NOT. y_wall_reached ) y_wall_reached = reach_y(t_index)
	462	!
	463	!-- Check if a particle needs to be reflected at any yz-wall. If
	464	!-- necessary, carry out reflection. Please note, a security
	465	!-- constant is required, as the particle position do not
	466	!-- necessarily exactly match the wall location due to rounding
	467	!-- errors.
	468	IF ( ABS( pos_x - xwall ) < eps .AND. &
	469	pos_z <= zw(nzb_s_inner(j3,i3)) .AND. &
	470	reach_x(t_index) .AND. &
	471	.NOT. reflect_x ) THEN
	472	!
	473	!-- Reflection in x-direction.
	474	!-- Ensure correct reflection by MIN/MAX functions, depending on
	475	!-- direction of particle transport.
	476	!-- Due to rounding errors pos_x do not exactly matches the wall
	477	!-- location, leading to erroneous reflection.
	478	pos_x = MERGE( MIN( 2.0_wp * xwall - pos_x, xwall ), &
	479	MAX( 2.0_wp * xwall - pos_x, xwall ), &
	480	particles(n)%x > xwall )
	481	!
	482	!-- Change sign of particle speed
	483	particles(n)%speed_x = - particles(n)%speed_x
	484	!
	485	!-- Change also sign of subgrid-scale particle speed
	486	particles(n)%rvar1 = - particles(n)%rvar1
	487	!
	488	!-- Set flag that reflection along x is already done
	489	reflect_x = .TRUE.
	490	!
	491	!-- As particle do not crosses any further yz-wall during
	492	!-- this timestep, set further x-indices to the current one.
	493	x_ind(t_index:t_index_number) = i1
	494	!
	495	!-- If particle already reached the wall but was not reflected,
	496	!-- set further x-indices to the new one.
	497	ELSEIF ( x_wall_reached .AND. .NOT. reflect_x ) THEN
	498	x_ind(t_index:t_index_number) = i2
	499	ENDIF
	500	!
	501	!-- Check if a particle needs to be reflected at any xz-wall. If
	502	!-- necessary, carry out reflection.
	503	IF ( ABS( pos_y - ywall ) < eps .AND. &
	504	pos_z <= zw(nzb_s_inner(j3,i3)) .AND. &
	505	reach_y(t_index) .AND. &
	506	.NOT. reflect_y ) THEN
[61]	507
[1929]	508	pos_y = MERGE( MIN( 2.0_wp * ywall - pos_y, ywall ), &
	509	MAX( 2.0_wp * ywall - pos_y, ywall ), &
	510	particles(n)%y > ywall )
[58]	511
[1929]	512	particles(n)%speed_y = - particles(n)%speed_y
	513	particles(n)%rvar2 = - particles(n)%rvar2
	514
	515	reflect_y = .TRUE.
	516	y_ind(t_index:t_index_number) = j1
[58]	517
[1929]	518	ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN
	519	y_ind(t_index:t_index_number) = j2
[849]	520	ENDIF
[58]	521	!
[1929]	522	!-- Check if a particle needs to be reflected at any xy-wall. If
	523	!-- necessary, carry out reflection.
	524	IF ( downwards .AND. reach_z(t_index) .AND. &
	525	.NOT. reflect_z ) THEN
	526	IF ( pos_z - zw(nzb_s_inner(j3,i3)) < eps ) THEN
	527
	528	pos_z = MAX( 2.0_wp * zw(nzb_s_inner(j3,i3)) - pos_z, &
	529	zw(nzb_s_inner(j3,i3)) )
[58]	530
[1929]	531	particles(n)%speed_z = - particles(n)%speed_z
	532	particles(n)%rvar3 = - particles(n)%rvar3
[58]	533
[1929]	534	reflect_z = .TRUE.
[58]	535
[61]	536	ENDIF
[58]	537
[849]	538	ENDIF
[58]	539	!
[1929]	540	!-- Swap time
	541	t_old = t(t_index)
[58]	542
[1929]	543	ENDDO
[61]	544	!
[1929]	545	!-- If a particle was reflected, calculate final position from last
	546	!-- intermediate position.
	547	IF ( reflect_x .OR. reflect_y .OR. reflect_z ) THEN
[61]	548
[1929]	549	particles(n)%x = pos_x + ( 1.0_wp - t_old ) * dt_particle &
	550	* particles(n)%speed_x
	551	particles(n)%y = pos_y + ( 1.0_wp - t_old ) * dt_particle &
	552	* particles(n)%speed_y
	553	particles(n)%z = pos_z + ( 1.0_wp - t_old ) * dt_particle &
	554	* particles(n)%speed_z
[61]	555
[849]	556	ENDIF
[61]	557
[1929]	558	ENDIF
[61]	559
[849]	560	ENDDO
[58]	561
[849]	562	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' )
[58]	563
[849]	564	ENDIF
[61]	565
[849]	566	END SUBROUTINE lpm_boundary_conds

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