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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 2806

Last change on this file since 2806 was 2801, checked in by thiele, 7 years ago
Introduce particle transfer in nested models
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File size: 27.3 KB

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[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 2801 2018-02-14 16:01:55Z thiele $
[2801]	27	! Introduce particle transfer in nested models.
	28	!
	29	! 2718 2018-01-02 08:49:38Z maronga
[2716]	30	! Corrected "Former revisions" section
	31	!
	32	! 2701 2017-12-15 15:40:50Z suehring
	33	! Changes from last commit documented
	34	!
	35	! 2698 2017-12-14 18:46:24Z suehring
[2698]	36	! Particle reflections at downward-facing walls implemented. Moreover,
	37	! reflections are adjusted to revised particle grid box location.
[2716]	38	! (responsible Philipp Thiele)
	39	!
	40	! 2696 2017-12-14 17:12:51Z kanani
	41	! Change in file header (GPL part)
	42	!
	43	! 2606 2017-11-10 10:36:31Z schwenkel
[2606]	44	! Changed particle box locations: center of particle box now coincides
	45	! with scalar grid point of same index.
	46	! Renamed module and subroutines: lpm_pack_arrays_mod -> lpm_pack_and_sort_mod
	47	! lpm_pack_all_arrays -> lpm_sort_in_subboxes, lpm_pack_arrays -> lpm_pack
	48	! lpm_sort -> lpm_sort_timeloop_done
	49	!
	50	! 2318 2017-07-20 17:27:44Z suehring
[2318]	51	! Get topography top index via Function call
	52	!
	53	! 2317 2017-07-20 17:27:19Z suehring
[1321]	54	!
[2233]	55	! 2232 2017-05-30 17:47:52Z suehring
	56	! Adjustments to new topography and surface concept
	57	! Rename character range into location, as range is an intrinsic.
	58	!
[2001]	59	! 2000 2016-08-20 18:09:15Z knoop
	60	! Forced header and separation lines into 80 columns
	61	!
[1930]	62	! 1929 2016-06-09 16:25:25Z suehring
	63	! Rewritten wall reflection
	64	!
[1823]	65	! 1822 2016-04-07 07:49:42Z hoffmann
	66	! Tails removed. Unused variables removed.
	67	!
[1683]	68	! 1682 2015-10-07 23:56:08Z knoop
	69	! Code annotations made doxygen readable
	70	!
[1360]	71	! 1359 2014-04-11 17:15:14Z hoffmann
	72	! New particle structure integrated.
	73	! Kind definition added to all floating point numbers.
	74	!
[1321]	75	! 1320 2014-03-20 08:40:49Z raasch
[1320]	76	! ONLY-attribute added to USE-statements,
	77	! kind-parameters added to all INTEGER and REAL declaration statements,
	78	! kinds are defined in new module kinds,
	79	! revision history before 2012 removed,
	80	! comment fields (!:) to be used for variable explanations added to
	81	! all variable declaration statements
[58]	82	!
[1037]	83	! 1036 2012-10-22 13:43:42Z raasch
	84	! code put under GPL (PALM 3.9)
	85	!
[850]	86	! 849 2012-03-15 10:35:09Z raasch
	87	! routine renamed lpm_boundary_conds, bottom and top boundary conditions
	88	! included (former part of advec_particles)
	89	!
[826]	90	! 824 2012-02-17 09:09:57Z raasch
	91	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3
	92	!
[58]	93	! Initial version (2007/03/09)
	94	!
	95	! Description:
	96	! ------------
[1682]	97	!> Boundary conditions for the Lagrangian particles.
	98	!> The routine consists of two different parts. One handles the bottom (flat)
	99	!> and top boundary. In this part, also particles which exceeded their lifetime
	100	!> are deleted.
	101	!> The other part handles the reflection of particles from vertical walls.
	102	!> This part was developed by Jin Zhang during 2006-2007.
	103	!>
	104	!> To do: Code structure for finding the t_index values and for checking the
	105	!> ----- reflection conditions is basically the same for all four cases, so it
	106	!> should be possible to further simplify/shorten it.
	107	!>
	108	!> THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!!
	109	!> (see offset_ocean_*)
[58]	110	!------------------------------------------------------------------------------!
[2698]	111	SUBROUTINE lpm_boundary_conds( location , i, j, k )
[1682]	112
[58]	113
[1320]	114	USE arrays_3d, &
	115	ONLY: zu, zw
[58]	116
[1320]	117	USE control_parameters, &
[1822]	118	ONLY: dz, message_string, particle_maximum_age
[58]	119
[1320]	120	USE cpulog, &
	121	ONLY: cpu_log, log_point_s
[849]	122
[1320]	123	USE grid_variables, &
	124	ONLY: ddx, dx, ddy, dy
[58]	125
[1320]	126	USE indices, &
[2698]	127	ONLY: nxl, nxr, nyn, nys, nz, nzb, wall_flags_0,nyng,nysg
[61]	128
[1320]	129	USE kinds
[58]	130
[1320]	131	USE particle_attributes, &
[1822]	132	ONLY: deleted_particles, ibc_par_b, ibc_par_t, number_of_particles, &
	133	particles, particle_type, offset_ocean_nzt_m1, &
	134	use_sgs_for_particles
[60]	135
[1320]	136	USE pegrid
[58]	137
[1320]	138	IMPLICIT NONE
[58]	139
[2232]	140	CHARACTER (LEN=*) :: location !<
[1320]	141
[2698]	142	INTEGER(iwp), INTENT(IN) :: i !<
	143	INTEGER(iwp), INTENT(IN) :: j !<
	144	INTEGER(iwp), INTENT(IN) :: k !<
	145
[1929]	146	INTEGER(iwp) :: inc !< dummy for sorting algorithmus
	147	INTEGER(iwp) :: ir !< dummy for sorting algorithmus
	148	INTEGER(iwp) :: i1 !< grid index (x) of old particle position
	149	INTEGER(iwp) :: i2 !< grid index (x) of current particle position
	150	INTEGER(iwp) :: i3 !< grid index (x) of intermediate particle position
	151	INTEGER(iwp) :: jr !< dummy for sorting algorithmus
	152	INTEGER(iwp) :: j1 !< grid index (y) of old particle position
[2698]	153	INTEGER(iwp) :: j2 !< grid index (y) of current particle position
	154	INTEGER(iwp) :: j3 !< grid index (y) of intermediate particle position
	155	INTEGER(iwp) :: k1 !< grid index (z) of old particle position
	156	INTEGER(iwp) :: k2 !< grid index (z) of current particle position
	157	INTEGER(iwp) :: k3 !< grid index (z) of intermediate particle position
[1929]	158	INTEGER(iwp) :: n !< particle number
	159	INTEGER(iwp) :: t_index !< running index for intermediate particle timesteps in reflection algorithmus
	160	INTEGER(iwp) :: t_index_number !< number of intermediate particle timesteps in reflection algorithmus
[2698]	161	INTEGER(iwp) :: tmp_x !< dummy for sorting algorithm
	162	INTEGER(iwp) :: tmp_y !< dummy for sorting algorithm
	163	INTEGER(iwp) :: tmp_z !< dummy for sorting algorithm
[1929]	164
	165	INTEGER(iwp), DIMENSION(0:10) :: x_ind(0:10) = 0 !< index array (x) of intermediate particle positions
[2698]	166	INTEGER(iwp), DIMENSION(0:10) :: y_ind(0:10) = 0 !< index array (y) of intermediate particle positions
	167	INTEGER(iwp), DIMENSION(0:10) :: z_ind(0:10) = 0 !< index array (z) of intermediate particle positions
[1320]	168
[1929]	169	LOGICAL :: cross_wall_x !< flag to check if particle reflection along x is necessary
	170	LOGICAL :: cross_wall_y !< flag to check if particle reflection along y is necessary
[2698]	171	LOGICAL :: cross_wall_z !< flag to check if particle reflection along z is necessary
[1929]	172	LOGICAL :: reflect_x !< flag to check if particle is already reflected along x
	173	LOGICAL :: reflect_y !< flag to check if particle is already reflected along y
	174	LOGICAL :: reflect_z !< flag to check if particle is already reflected along z
	175	LOGICAL :: tmp_reach_x !< dummy for sorting algorithmus
	176	LOGICAL :: tmp_reach_y !< dummy for sorting algorithmus
	177	LOGICAL :: tmp_reach_z !< dummy for sorting algorithmus
	178	LOGICAL :: x_wall_reached !< flag to check if particle has already reached wall
	179	LOGICAL :: y_wall_reached !< flag to check if particle has already reached wall
[2698]	180	LOGICAL :: z_wall_reached !< flag to check if particle has already reached wall
[1320]	181
[1929]	182	LOGICAL, DIMENSION(0:10) :: reach_x !< flag to check if particle is at a yz-wall
	183	LOGICAL, DIMENSION(0:10) :: reach_y !< flag to check if particle is at a xz-wall
	184	LOGICAL, DIMENSION(0:10) :: reach_z !< flag to check if particle is at a xy-wall
[1320]	185
[1929]	186	REAL(wp) :: dt_particle !< particle timestep
	187	REAL(wp) :: dum !< dummy argument
	188	REAL(wp) :: eps = 1E-10_wp !< security number to check if particle has reached a wall
	189	REAL(wp) :: pos_x !< intermediate particle position (x)
	190	REAL(wp) :: pos_x_old !< particle position (x) at previous particle timestep
	191	REAL(wp) :: pos_y !< intermediate particle position (y)
	192	REAL(wp) :: pos_y_old !< particle position (y) at previous particle timestep
	193	REAL(wp) :: pos_z !< intermediate particle position (z)
	194	REAL(wp) :: pos_z_old !< particle position (z) at previous particle timestep
	195	REAL(wp) :: prt_x !< current particle position (x)
	196	REAL(wp) :: prt_y !< current particle position (y)
	197	REAL(wp) :: prt_z !< current particle position (z)
	198	REAL(wp) :: t_old !< previous reflection time
	199	REAL(wp) :: tmp_t !< dummy for sorting algorithmus
	200	REAL(wp) :: xwall !< location of wall in x
	201	REAL(wp) :: ywall !< location of wall in y
[2698]	202	REAL(wp) :: zwall !< location of wall in z
[1929]	203
	204	REAL(wp), DIMENSION(0:10) :: t !< reflection time
	205
	206
[2232]	207	IF ( location == 'bottom/top' ) THEN
[58]	208
[849]	209	!
	210	!-- Apply boundary conditions to those particles that have crossed the top or
	211	!-- bottom boundary and delete those particles, which are older than allowed
	212	DO n = 1, number_of_particles
[61]	213
[849]	214	!
	215	!-- Stop if particles have moved further than the length of one
	216	!-- PE subdomain (newly released particles have age = age_m!)
	217	IF ( particles(n)%age /= particles(n)%age_m ) THEN
	218	IF ( ABS(particles(n)%speed_x) > &
	219	((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. &
	220	ABS(particles(n)%speed_y) > &
	221	((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN
[60]	222
[849]	223	WRITE( message_string, * ) 'particle too fast. n = ', n
	224	CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 )
	225	ENDIF
	226	ENDIF
[58]	227
[849]	228	IF ( particles(n)%age > particle_maximum_age .AND. &
[1359]	229	particles(n)%particle_mask ) &
[849]	230	THEN
[1359]	231	particles(n)%particle_mask = .FALSE.
[849]	232	deleted_particles = deleted_particles + 1
	233	ENDIF
[58]	234
[2801]	235	IF ( particles(n)%z >= zw(nz) .AND. particles(n)%particle_mask ) THEN
[849]	236	IF ( ibc_par_t == 1 ) THEN
[61]	237	!
[849]	238	!-- Particle absorption
[2801]	239	WRITE(9,*) 'particle absorption'
[1359]	240	particles(n)%particle_mask = .FALSE.
[849]	241	deleted_particles = deleted_particles + 1
	242	ELSEIF ( ibc_par_t == 2 ) THEN
	243	!
	244	!-- Particle reflection
[2801]	245	particles(n)%z = 2.0_wp * zw(nz) - particles(n)%z
[849]	246	particles(n)%speed_z = -particles(n)%speed_z
	247	IF ( use_sgs_for_particles .AND. &
[1359]	248	particles(n)%rvar3 > 0.0_wp ) THEN
[849]	249	particles(n)%rvar3 = -particles(n)%rvar3
	250	ENDIF
	251	ENDIF
	252	ENDIF
[1359]	253
	254	IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN
[849]	255	IF ( ibc_par_b == 1 ) THEN
	256	!
	257	!-- Particle absorption
[1359]	258	particles(n)%particle_mask = .FALSE.
[849]	259	deleted_particles = deleted_particles + 1
	260	ELSEIF ( ibc_par_b == 2 ) THEN
	261	!
	262	!-- Particle reflection
[1359]	263	particles(n)%z = 2.0_wp * zw(0) - particles(n)%z
[849]	264	particles(n)%speed_z = -particles(n)%speed_z
	265	IF ( use_sgs_for_particles .AND. &
[1359]	266	particles(n)%rvar3 < 0.0_wp ) THEN
[849]	267	particles(n)%rvar3 = -particles(n)%rvar3
	268	ENDIF
	269	ENDIF
	270	ENDIF
	271	ENDDO
[58]	272
[2232]	273	ELSEIF ( location == 'walls' ) THEN
[58]	274
[1929]	275
[849]	276	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' )
	277
	278	DO n = 1, number_of_particles
[1929]	279	!
	280	!-- Recalculate particle timestep
[849]	281	dt_particle = particles(n)%age - particles(n)%age_m
[1929]	282	!
	283	!-- Obtain x/y indices for current particle position
[2606]	284	i2 = particles(n)%x * ddx
	285	j2 = particles(n)%y * ddy
[2698]	286	IF (zw(k) < particles(n)%z ) k2 = k + 1
	287	IF (zw(k-1) > particles(n)%z ) k2 = k - 1
[1929]	288	!
	289	!-- Save current particle positions
[849]	290	prt_x = particles(n)%x
	291	prt_y = particles(n)%y
	292	prt_z = particles(n)%z
[58]	293	!
[1929]	294	!-- Recalculate old particle positions
	295	pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle
	296	pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle
	297	pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle
[849]	298	!
[1929]	299	!-- Obtain x/y indices for old particle positions
[2698]	300	i1 = i
	301	j1 = j
	302	k1 = k
[58]	303	!
[1929]	304	!-- Determine horizontal as well as vertical walls at which particle can
	305	!-- be potentially reflected.
	306	!-- Start with walls aligned in yz layer.
	307	!-- Wall to the right
	308	IF ( prt_x > pos_x_old ) THEN
[2698]	309	xwall = ( i1 + 1 ) * dx
[1929]	310	!
	311	!-- Wall to the left
	312	ELSE
[2698]	313	xwall = i1 * dx
[1929]	314	ENDIF
	315	!
	316	!-- Walls aligned in xz layer
	317	!-- Wall to the north
	318	IF ( prt_y > pos_y_old ) THEN
[2698]	319	ywall = ( j1 +1 ) * dy
[1929]	320	!-- Wall to the south
	321	ELSE
[2698]	322	ywall = j1 * dy
[1929]	323	ENDIF
[2698]	324
	325	IF ( prt_z > pos_z_old ) THEN
	326	zwall = zw(k)
	327	ELSE
	328	zwall = zw(k-1)
	329	ENDIF
[1929]	330	!
	331	!-- Initialize flags to check if particle reflection is necessary
	332	cross_wall_x = .FALSE.
	333	cross_wall_y = .FALSE.
[2698]	334	cross_wall_z = .FALSE.
[1929]	335	!
	336	!-- Initialize flags to check if a wall is reached
	337	reach_x = .FALSE.
	338	reach_y = .FALSE.
	339	reach_z = .FALSE.
	340	!
	341	!-- Initialize flags to check if a particle was already reflected
[2698]	342	reflect_x = .FALSE.
	343	reflect_y = .FALSE.
	344	reflect_z = .FALSE.
[1929]	345	!
[2698]	346	!-- Initialize flags to check if a wall is already crossed.
[1929]	347	!-- ( Required to obtain correct indices. )
	348	x_wall_reached = .FALSE.
	349	y_wall_reached = .FALSE.
[2698]	350	z_wall_reached = .FALSE.
[1929]	351	!
	352	!-- Initialize time array
	353	t = 0.0_wp
	354	!
	355	!-- Check if particle can reach any wall. This case, calculate the
	356	!-- fractional time needed to reach this wall. Store this fractional
	357	!-- timestep in array t. Moreover, store indices for these grid
	358	!-- boxes where the respective wall belongs to.
	359	!-- Start with x-direction.
	360	t_index = 1
	361	t(t_index) = ( xwall - pos_x_old ) &
	362	/ MERGE( MAX( prt_x - pos_x_old, 1E-30_wp ), &
	363	MIN( prt_x - pos_x_old, -1E-30_wp ), &
	364	prt_x > pos_x_old )
	365	x_ind(t_index) = i2
	366	y_ind(t_index) = j1
[2698]	367	z_ind(t_index) = k1
[1929]	368	reach_x(t_index) = .TRUE.
	369	reach_y(t_index) = .FALSE.
	370	reach_z(t_index) = .FALSE.
	371	!
	372	!-- Store these values only if particle really reaches any wall. t must
	373	!-- be in a interval between [0:1].
	374	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	375	t_index = t_index + 1
	376	cross_wall_x = .TRUE.
	377	ENDIF
	378	!
	379	!-- y-direction
	380	t(t_index) = ( ywall - pos_y_old ) &
	381	/ MERGE( MAX( prt_y - pos_y_old, 1E-30_wp ), &
	382	MIN( prt_y - pos_y_old, -1E-30_wp ), &
	383	prt_y > pos_y_old )
	384	x_ind(t_index) = i1
	385	y_ind(t_index) = j2
[2698]	386	z_ind(t_index) = k1
[1929]	387	reach_x(t_index) = .FALSE.
	388	reach_y(t_index) = .TRUE.
	389	reach_z(t_index) = .FALSE.
	390	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	391	t_index = t_index + 1
	392	cross_wall_y = .TRUE.
	393	ENDIF
	394	!
	395	!-- z-direction
[2698]	396	t(t_index) = (zwall - pos_z_old ) &
	397	/ MERGE( MAX( prt_z - pos_z_old, 1E-30_wp ), &
	398	MIN( prt_z - pos_z_old, -1E-30_wp ), &
	399	prt_z > pos_z_old )
	400
	401	x_ind(t_index) = i1
	402	y_ind(t_index) = j1
	403	z_ind(t_index) = k2
	404	reach_x(t_index) = .FALSE.
	405	reach_y(t_index) = .FALSE.
	406	reach_z(t_index) = .TRUE.
	407	IF( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp) THEN
	408	t_index = t_index + 1
	409	cross_wall_z = .TRUE.
	410	ENDIF
	411
[1929]	412	t_index_number = t_index - 1
[58]	413	!
[1929]	414	!-- Carry out reflection only if particle reaches any wall
[2698]	415	IF ( cross_wall_x .OR. cross_wall_y .OR. cross_wall_z ) THEN
[58]	416	!
[1929]	417	!-- Sort fractional timesteps in ascending order. Also sort the
	418	!-- corresponding indices and flag according to the time interval a
	419	!-- particle reaches the respective wall.
	420	inc = 1
	421	jr = 1
	422	DO WHILE ( inc <= t_index_number )
	423	inc = 3 * inc + 1
	424	ENDDO
[58]	425
[1929]	426	DO WHILE ( inc > 1 )
	427	inc = inc / 3
	428	DO ir = inc+1, t_index_number
	429	tmp_t = t(ir)
	430	tmp_x = x_ind(ir)
	431	tmp_y = y_ind(ir)
[2698]	432	tmp_z = z_ind(ir)
[1929]	433	tmp_reach_x = reach_x(ir)
	434	tmp_reach_y = reach_y(ir)
	435	tmp_reach_z = reach_z(ir)
	436	jr = ir
	437	DO WHILE ( t(jr-inc) > tmp_t )
	438	t(jr) = t(jr-inc)
	439	x_ind(jr) = x_ind(jr-inc)
	440	y_ind(jr) = y_ind(jr-inc)
[2698]	441	z_ind(jr) = z_ind(jr-inc)
[1929]	442	reach_x(jr) = reach_x(jr-inc)
	443	reach_y(jr) = reach_y(jr-inc)
	444	reach_z(jr) = reach_z(jr-inc)
	445	jr = jr - inc
	446	IF ( jr <= inc ) EXIT
[58]	447	ENDDO
[1929]	448	t(jr) = tmp_t
	449	x_ind(jr) = tmp_x
	450	y_ind(jr) = tmp_y
[2698]	451	z_ind(jr) = tmp_z
[1929]	452	reach_x(jr) = tmp_reach_x
	453	reach_y(jr) = tmp_reach_y
	454	reach_z(jr) = tmp_reach_z
[58]	455	ENDDO
[1929]	456	ENDDO
[58]	457	!
[1929]	458	!-- Initialize temporary particle positions
	459	pos_x = pos_x_old
	460	pos_y = pos_y_old
	461	pos_z = pos_z_old
	462	!
	463	!-- Loop over all times a particle possibly moves into a new grid box
	464	t_old = 0.0_wp
	465	DO t_index = 1, t_index_number
	466	!
	467	!-- Calculate intermediate particle position according to the
	468	!-- timesteps a particle reaches any wall.
	469	pos_x = pos_x + ( t(t_index) - t_old ) * dt_particle &
	470	* particles(n)%speed_x
	471	pos_y = pos_y + ( t(t_index) - t_old ) * dt_particle &
	472	* particles(n)%speed_y
	473	pos_z = pos_z + ( t(t_index) - t_old ) * dt_particle &
	474	* particles(n)%speed_z
	475	!
	476	!-- Obtain x/y grid indices for intermediate particle position from
	477	!-- sorted index array
	478	i3 = x_ind(t_index)
	479	j3 = y_ind(t_index)
[2698]	480	k3 = z_ind(t_index)
[1929]	481	!
	482	!-- Check which wall is already reached
	483	IF ( .NOT. x_wall_reached ) x_wall_reached = reach_x(t_index)
[2698]	484	IF ( .NOT. y_wall_reached ) y_wall_reached = reach_y(t_index)
	485	IF ( .NOT. z_wall_reached ) z_wall_reached = reach_z(t_index)
[1929]	486	!
	487	!-- Check if a particle needs to be reflected at any yz-wall. If
	488	!-- necessary, carry out reflection. Please note, a security
[2698]	489	!-- constant is required, as the particle position does not
[1929]	490	!-- necessarily exactly match the wall location due to rounding
[2698]	491	!-- errors.
	492	IF ( reach_x(t_index) .AND. &
	493	ABS( pos_x - xwall ) < eps .AND. &
	494	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	495	.NOT. reflect_x ) THEN
[2698]	496	!
	497	!
[1929]	498	!-- Reflection in x-direction.
	499	!-- Ensure correct reflection by MIN/MAX functions, depending on
	500	!-- direction of particle transport.
[2698]	501	!-- Due to rounding errors pos_x does not exactly match the wall
[1929]	502	!-- location, leading to erroneous reflection.
	503	pos_x = MERGE( MIN( 2.0_wp * xwall - pos_x, xwall ), &
	504	MAX( 2.0_wp * xwall - pos_x, xwall ), &
	505	particles(n)%x > xwall )
	506	!
	507	!-- Change sign of particle speed
	508	particles(n)%speed_x = - particles(n)%speed_x
	509	!
[2698]	510	!-- Also change sign of subgrid-scale particle speed
[1929]	511	particles(n)%rvar1 = - particles(n)%rvar1
	512	!
	513	!-- Set flag that reflection along x is already done
	514	reflect_x = .TRUE.
	515	!
[2698]	516	!-- As the particle does not cross any further yz-wall during
[1929]	517	!-- this timestep, set further x-indices to the current one.
	518	x_ind(t_index:t_index_number) = i1
	519	!
	520	!-- If particle already reached the wall but was not reflected,
	521	!-- set further x-indices to the new one.
	522	ELSEIF ( x_wall_reached .AND. .NOT. reflect_x ) THEN
	523	x_ind(t_index:t_index_number) = i2
[2698]	524	ENDIF !particle reflection in x direction done
	525
[1929]	526	!
	527	!-- Check if a particle needs to be reflected at any xz-wall. If
[2698]	528	!-- necessary, carry out reflection. Please note, a security
	529	!-- constant is required, as the particle position does not
	530	!-- necessarily exactly match the wall location due to rounding
	531	!-- errors.
	532	WRITE(9,*) 'wall_test_y nysg:',nysg ,' y: ',particles(n)%y,' j3: ',j3,'nyng:', nyng
	533	FLUSH(9)
	534	WRITE(9,*) BTEST(wall_flags_0(k3,j3,i3),0)
	535	FLUSH(9)
	536	IF ( reach_y(t_index) .AND. &
	537	ABS( pos_y - ywall ) < eps .AND. &
	538	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
	539	.NOT. reflect_y ) THEN
	540	!
	541	!
	542	!-- Reflection in y-direction.
	543	!-- Ensure correct reflection by MIN/MAX functions, depending on
	544	!-- direction of particle transport.
	545	!-- Due to rounding errors pos_y does not exactly match the wall
	546	!-- location, leading to erroneous reflection.
[1929]	547	pos_y = MERGE( MIN( 2.0_wp * ywall - pos_y, ywall ), &
	548	MAX( 2.0_wp * ywall - pos_y, ywall ), &
[2698]	549	particles(n)%y > ywall )
	550	!
	551	!-- Change sign of particle speed
	552	particles(n)%speed_y = - particles(n)%speed_y
	553	!
	554	!-- Also change sign of subgrid-scale particle speed
	555	particles(n)%rvar2 = - particles(n)%rvar2
	556	!
	557	!-- Set flag that reflection along y is already done
	558	reflect_y = .TRUE.
	559	!
	560	!-- As the particle does not cross any further xz-wall during
	561	!-- this timestep, set further y-indices to the current one.
[1929]	562	y_ind(t_index:t_index_number) = j1
[2698]	563	!
	564	!-- If particle already reached the wall but was not reflected,
	565	!-- set further y-indices to the new one.
[1929]	566	ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN
[2698]	567	y_ind(t_index:t_index_number) = j2
	568	ENDIF !particle reflection in y direction done
	569
[58]	570	!
[1929]	571	!-- Check if a particle needs to be reflected at any xy-wall. If
[2698]	572	!-- necessary, carry out reflection. Please note, a security
	573	!-- constant is required, as the particle position does not
	574	!-- necessarily exactly match the wall location due to rounding
	575	!-- errors.
	576	IF ( reach_z(t_index) .AND. &
	577	ABS( pos_z - zwall ) < eps .AND. &
	578	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	579	.NOT. reflect_z ) THEN
[2698]	580	!
	581	!
	582	!-- Reflection in z-direction.
	583	!-- Ensure correct reflection by MIN/MAX functions, depending on
	584	!-- direction of particle transport.
	585	!-- Due to rounding errors pos_z does not exactly match the wall
	586	!-- location, leading to erroneous reflection.
	587	pos_z = MERGE( MIN( 2.0_wp * zwall - pos_z, zwall ), &
	588	MAX( 2.0_wp * zwall - pos_z, zwall ), &
	589	particles(n)%z > zwall )
[2232]	590	!
[2698]	591	!-- Change sign of particle speed
	592	particles(n)%speed_z = - particles(n)%speed_z
[58]	593	!
[2698]	594	!-- Also change sign of subgrid-scale particle speed
	595	particles(n)%rvar3 = - particles(n)%rvar3
	596	!
	597	!-- Set flag that reflection along z is already done
	598	reflect_z = .TRUE.
	599	!
	600	!-- As the particle does not cross any further xy-wall during
	601	!-- this timestep, set further z-indices to the current one.
	602	z_ind(t_index:t_index_number) = k1
	603	!
	604	!-- If particle already reached the wall but was not reflected,
	605	!-- set further z-indices to the new one.
	606	ELSEIF ( z_wall_reached .AND. .NOT. reflect_z ) THEN
	607	z_ind(t_index:t_index_number) = k2
	608	ENDIF !particle reflection in z direction done
	609
	610	!
[1929]	611	!-- Swap time
	612	t_old = t(t_index)
[58]	613
[1929]	614	ENDDO
[61]	615	!
[1929]	616	!-- If a particle was reflected, calculate final position from last
	617	!-- intermediate position.
	618	IF ( reflect_x .OR. reflect_y .OR. reflect_z ) THEN
[61]	619
[1929]	620	particles(n)%x = pos_x + ( 1.0_wp - t_old ) * dt_particle &
	621	* particles(n)%speed_x
	622	particles(n)%y = pos_y + ( 1.0_wp - t_old ) * dt_particle &
	623	* particles(n)%speed_y
	624	particles(n)%z = pos_z + ( 1.0_wp - t_old ) * dt_particle &
	625	* particles(n)%speed_z
[61]	626
[849]	627	ENDIF
[61]	628
[1929]	629	ENDIF
[61]	630
[849]	631	ENDDO
[58]	632
[849]	633	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' )
[58]	634
[849]	635	ENDIF
[61]	636
[849]	637	END SUBROUTINE lpm_boundary_conds

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