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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 3183

Last change on this file since 3183 was 3067, checked in by suehring, 6 years ago
Remove write statements
Property svn:keywords set to `Id`
File size: 27.1 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 3067 2018-06-12 14:04:34Z suehring $
[3067]	27	! Remove write statements
	28	!
	29	! 2801 2018-02-14 16:01:55Z thiele
[2801]	30	! Introduce particle transfer in nested models.
	31	!
	32	! 2718 2018-01-02 08:49:38Z maronga
[2716]	33	! Corrected "Former revisions" section
	34	!
	35	! 2701 2017-12-15 15:40:50Z suehring
	36	! Changes from last commit documented
	37	!
	38	! 2698 2017-12-14 18:46:24Z suehring
[2698]	39	! Particle reflections at downward-facing walls implemented. Moreover,
	40	! reflections are adjusted to revised particle grid box location.
[2716]	41	! (responsible Philipp Thiele)
	42	!
	43	! 2696 2017-12-14 17:12:51Z kanani
	44	! Change in file header (GPL part)
	45	!
	46	! 2606 2017-11-10 10:36:31Z schwenkel
[2606]	47	! Changed particle box locations: center of particle box now coincides
	48	! with scalar grid point of same index.
	49	! Renamed module and subroutines: lpm_pack_arrays_mod -> lpm_pack_and_sort_mod
	50	! lpm_pack_all_arrays -> lpm_sort_in_subboxes, lpm_pack_arrays -> lpm_pack
	51	! lpm_sort -> lpm_sort_timeloop_done
	52	!
	53	! 2318 2017-07-20 17:27:44Z suehring
[2318]	54	! Get topography top index via Function call
	55	!
	56	! 2317 2017-07-20 17:27:19Z suehring
[1321]	57	!
[2233]	58	! 2232 2017-05-30 17:47:52Z suehring
	59	! Adjustments to new topography and surface concept
	60	! Rename character range into location, as range is an intrinsic.
	61	!
[2001]	62	! 2000 2016-08-20 18:09:15Z knoop
	63	! Forced header and separation lines into 80 columns
	64	!
[1930]	65	! 1929 2016-06-09 16:25:25Z suehring
	66	! Rewritten wall reflection
	67	!
[1823]	68	! 1822 2016-04-07 07:49:42Z hoffmann
	69	! Tails removed. Unused variables removed.
	70	!
[1683]	71	! 1682 2015-10-07 23:56:08Z knoop
	72	! Code annotations made doxygen readable
	73	!
[1360]	74	! 1359 2014-04-11 17:15:14Z hoffmann
	75	! New particle structure integrated.
	76	! Kind definition added to all floating point numbers.
	77	!
[1321]	78	! 1320 2014-03-20 08:40:49Z raasch
[1320]	79	! ONLY-attribute added to USE-statements,
	80	! kind-parameters added to all INTEGER and REAL declaration statements,
	81	! kinds are defined in new module kinds,
	82	! revision history before 2012 removed,
	83	! comment fields (!:) to be used for variable explanations added to
	84	! all variable declaration statements
[58]	85	!
[1037]	86	! 1036 2012-10-22 13:43:42Z raasch
	87	! code put under GPL (PALM 3.9)
	88	!
[850]	89	! 849 2012-03-15 10:35:09Z raasch
	90	! routine renamed lpm_boundary_conds, bottom and top boundary conditions
	91	! included (former part of advec_particles)
	92	!
[826]	93	! 824 2012-02-17 09:09:57Z raasch
	94	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3
	95	!
[58]	96	! Initial version (2007/03/09)
	97	!
	98	! Description:
	99	! ------------
[1682]	100	!> Boundary conditions for the Lagrangian particles.
	101	!> The routine consists of two different parts. One handles the bottom (flat)
	102	!> and top boundary. In this part, also particles which exceeded their lifetime
	103	!> are deleted.
	104	!> The other part handles the reflection of particles from vertical walls.
	105	!> This part was developed by Jin Zhang during 2006-2007.
	106	!>
	107	!> To do: Code structure for finding the t_index values and for checking the
	108	!> ----- reflection conditions is basically the same for all four cases, so it
	109	!> should be possible to further simplify/shorten it.
	110	!>
	111	!> THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!!
	112	!> (see offset_ocean_*)
[58]	113	!------------------------------------------------------------------------------!
[2698]	114	SUBROUTINE lpm_boundary_conds( location , i, j, k )
[1682]	115
[58]	116
[1320]	117	USE arrays_3d, &
	118	ONLY: zu, zw
[58]	119
[1320]	120	USE control_parameters, &
[1822]	121	ONLY: dz, message_string, particle_maximum_age
[58]	122
[1320]	123	USE cpulog, &
	124	ONLY: cpu_log, log_point_s
[849]	125
[1320]	126	USE grid_variables, &
	127	ONLY: ddx, dx, ddy, dy
[58]	128
[1320]	129	USE indices, &
[2698]	130	ONLY: nxl, nxr, nyn, nys, nz, nzb, wall_flags_0,nyng,nysg
[61]	131
[1320]	132	USE kinds
[58]	133
[1320]	134	USE particle_attributes, &
[1822]	135	ONLY: deleted_particles, ibc_par_b, ibc_par_t, number_of_particles, &
	136	particles, particle_type, offset_ocean_nzt_m1, &
	137	use_sgs_for_particles
[60]	138
[1320]	139	USE pegrid
[58]	140
[1320]	141	IMPLICIT NONE
[58]	142
[2232]	143	CHARACTER (LEN=*) :: location !<
[1320]	144
[2698]	145	INTEGER(iwp), INTENT(IN) :: i !<
	146	INTEGER(iwp), INTENT(IN) :: j !<
	147	INTEGER(iwp), INTENT(IN) :: k !<
	148
[1929]	149	INTEGER(iwp) :: inc !< dummy for sorting algorithmus
	150	INTEGER(iwp) :: ir !< dummy for sorting algorithmus
	151	INTEGER(iwp) :: i1 !< grid index (x) of old particle position
	152	INTEGER(iwp) :: i2 !< grid index (x) of current particle position
	153	INTEGER(iwp) :: i3 !< grid index (x) of intermediate particle position
	154	INTEGER(iwp) :: jr !< dummy for sorting algorithmus
	155	INTEGER(iwp) :: j1 !< grid index (y) of old particle position
[2698]	156	INTEGER(iwp) :: j2 !< grid index (y) of current particle position
	157	INTEGER(iwp) :: j3 !< grid index (y) of intermediate particle position
	158	INTEGER(iwp) :: k1 !< grid index (z) of old particle position
	159	INTEGER(iwp) :: k2 !< grid index (z) of current particle position
	160	INTEGER(iwp) :: k3 !< grid index (z) of intermediate particle position
[1929]	161	INTEGER(iwp) :: n !< particle number
	162	INTEGER(iwp) :: t_index !< running index for intermediate particle timesteps in reflection algorithmus
	163	INTEGER(iwp) :: t_index_number !< number of intermediate particle timesteps in reflection algorithmus
[2698]	164	INTEGER(iwp) :: tmp_x !< dummy for sorting algorithm
	165	INTEGER(iwp) :: tmp_y !< dummy for sorting algorithm
	166	INTEGER(iwp) :: tmp_z !< dummy for sorting algorithm
[1929]	167
	168	INTEGER(iwp), DIMENSION(0:10) :: x_ind(0:10) = 0 !< index array (x) of intermediate particle positions
[2698]	169	INTEGER(iwp), DIMENSION(0:10) :: y_ind(0:10) = 0 !< index array (y) of intermediate particle positions
	170	INTEGER(iwp), DIMENSION(0:10) :: z_ind(0:10) = 0 !< index array (z) of intermediate particle positions
[1320]	171
[1929]	172	LOGICAL :: cross_wall_x !< flag to check if particle reflection along x is necessary
	173	LOGICAL :: cross_wall_y !< flag to check if particle reflection along y is necessary
[2698]	174	LOGICAL :: cross_wall_z !< flag to check if particle reflection along z is necessary
[1929]	175	LOGICAL :: reflect_x !< flag to check if particle is already reflected along x
	176	LOGICAL :: reflect_y !< flag to check if particle is already reflected along y
	177	LOGICAL :: reflect_z !< flag to check if particle is already reflected along z
	178	LOGICAL :: tmp_reach_x !< dummy for sorting algorithmus
	179	LOGICAL :: tmp_reach_y !< dummy for sorting algorithmus
	180	LOGICAL :: tmp_reach_z !< dummy for sorting algorithmus
	181	LOGICAL :: x_wall_reached !< flag to check if particle has already reached wall
	182	LOGICAL :: y_wall_reached !< flag to check if particle has already reached wall
[2698]	183	LOGICAL :: z_wall_reached !< flag to check if particle has already reached wall
[1320]	184
[1929]	185	LOGICAL, DIMENSION(0:10) :: reach_x !< flag to check if particle is at a yz-wall
	186	LOGICAL, DIMENSION(0:10) :: reach_y !< flag to check if particle is at a xz-wall
	187	LOGICAL, DIMENSION(0:10) :: reach_z !< flag to check if particle is at a xy-wall
[1320]	188
[1929]	189	REAL(wp) :: dt_particle !< particle timestep
	190	REAL(wp) :: dum !< dummy argument
	191	REAL(wp) :: eps = 1E-10_wp !< security number to check if particle has reached a wall
	192	REAL(wp) :: pos_x !< intermediate particle position (x)
	193	REAL(wp) :: pos_x_old !< particle position (x) at previous particle timestep
	194	REAL(wp) :: pos_y !< intermediate particle position (y)
	195	REAL(wp) :: pos_y_old !< particle position (y) at previous particle timestep
	196	REAL(wp) :: pos_z !< intermediate particle position (z)
	197	REAL(wp) :: pos_z_old !< particle position (z) at previous particle timestep
	198	REAL(wp) :: prt_x !< current particle position (x)
	199	REAL(wp) :: prt_y !< current particle position (y)
	200	REAL(wp) :: prt_z !< current particle position (z)
	201	REAL(wp) :: t_old !< previous reflection time
	202	REAL(wp) :: tmp_t !< dummy for sorting algorithmus
	203	REAL(wp) :: xwall !< location of wall in x
	204	REAL(wp) :: ywall !< location of wall in y
[2698]	205	REAL(wp) :: zwall !< location of wall in z
[1929]	206
	207	REAL(wp), DIMENSION(0:10) :: t !< reflection time
	208
	209
[2232]	210	IF ( location == 'bottom/top' ) THEN
[58]	211
[849]	212	!
	213	!-- Apply boundary conditions to those particles that have crossed the top or
	214	!-- bottom boundary and delete those particles, which are older than allowed
	215	DO n = 1, number_of_particles
[61]	216
[849]	217	!
	218	!-- Stop if particles have moved further than the length of one
	219	!-- PE subdomain (newly released particles have age = age_m!)
	220	IF ( particles(n)%age /= particles(n)%age_m ) THEN
	221	IF ( ABS(particles(n)%speed_x) > &
	222	((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. &
	223	ABS(particles(n)%speed_y) > &
	224	((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN
[60]	225
[849]	226	WRITE( message_string, * ) 'particle too fast. n = ', n
	227	CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 )
	228	ENDIF
	229	ENDIF
[58]	230
[849]	231	IF ( particles(n)%age > particle_maximum_age .AND. &
[1359]	232	particles(n)%particle_mask ) &
[849]	233	THEN
[1359]	234	particles(n)%particle_mask = .FALSE.
[849]	235	deleted_particles = deleted_particles + 1
	236	ENDIF
[58]	237
[2801]	238	IF ( particles(n)%z >= zw(nz) .AND. particles(n)%particle_mask ) THEN
[849]	239	IF ( ibc_par_t == 1 ) THEN
[61]	240	!
[849]	241	!-- Particle absorption
[1359]	242	particles(n)%particle_mask = .FALSE.
[849]	243	deleted_particles = deleted_particles + 1
	244	ELSEIF ( ibc_par_t == 2 ) THEN
	245	!
	246	!-- Particle reflection
[2801]	247	particles(n)%z = 2.0_wp * zw(nz) - particles(n)%z
[849]	248	particles(n)%speed_z = -particles(n)%speed_z
	249	IF ( use_sgs_for_particles .AND. &
[1359]	250	particles(n)%rvar3 > 0.0_wp ) THEN
[849]	251	particles(n)%rvar3 = -particles(n)%rvar3
	252	ENDIF
	253	ENDIF
	254	ENDIF
[1359]	255
	256	IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN
[849]	257	IF ( ibc_par_b == 1 ) THEN
	258	!
	259	!-- Particle absorption
[1359]	260	particles(n)%particle_mask = .FALSE.
[849]	261	deleted_particles = deleted_particles + 1
	262	ELSEIF ( ibc_par_b == 2 ) THEN
	263	!
	264	!-- Particle reflection
[1359]	265	particles(n)%z = 2.0_wp * zw(0) - particles(n)%z
[849]	266	particles(n)%speed_z = -particles(n)%speed_z
	267	IF ( use_sgs_for_particles .AND. &
[1359]	268	particles(n)%rvar3 < 0.0_wp ) THEN
[849]	269	particles(n)%rvar3 = -particles(n)%rvar3
	270	ENDIF
	271	ENDIF
	272	ENDIF
	273	ENDDO
[58]	274
[2232]	275	ELSEIF ( location == 'walls' ) THEN
[58]	276
[1929]	277
[849]	278	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' )
	279
	280	DO n = 1, number_of_particles
[1929]	281	!
	282	!-- Recalculate particle timestep
[849]	283	dt_particle = particles(n)%age - particles(n)%age_m
[1929]	284	!
	285	!-- Obtain x/y indices for current particle position
[2606]	286	i2 = particles(n)%x * ddx
	287	j2 = particles(n)%y * ddy
[2698]	288	IF (zw(k) < particles(n)%z ) k2 = k + 1
	289	IF (zw(k-1) > particles(n)%z ) k2 = k - 1
[1929]	290	!
	291	!-- Save current particle positions
[849]	292	prt_x = particles(n)%x
	293	prt_y = particles(n)%y
	294	prt_z = particles(n)%z
[58]	295	!
[1929]	296	!-- Recalculate old particle positions
	297	pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle
	298	pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle
	299	pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle
[849]	300	!
[1929]	301	!-- Obtain x/y indices for old particle positions
[2698]	302	i1 = i
	303	j1 = j
	304	k1 = k
[58]	305	!
[1929]	306	!-- Determine horizontal as well as vertical walls at which particle can
	307	!-- be potentially reflected.
	308	!-- Start with walls aligned in yz layer.
	309	!-- Wall to the right
	310	IF ( prt_x > pos_x_old ) THEN
[2698]	311	xwall = ( i1 + 1 ) * dx
[1929]	312	!
	313	!-- Wall to the left
	314	ELSE
[2698]	315	xwall = i1 * dx
[1929]	316	ENDIF
	317	!
	318	!-- Walls aligned in xz layer
	319	!-- Wall to the north
	320	IF ( prt_y > pos_y_old ) THEN
[2698]	321	ywall = ( j1 +1 ) * dy
[1929]	322	!-- Wall to the south
	323	ELSE
[2698]	324	ywall = j1 * dy
[1929]	325	ENDIF
[2698]	326
	327	IF ( prt_z > pos_z_old ) THEN
	328	zwall = zw(k)
	329	ELSE
	330	zwall = zw(k-1)
	331	ENDIF
[1929]	332	!
	333	!-- Initialize flags to check if particle reflection is necessary
	334	cross_wall_x = .FALSE.
	335	cross_wall_y = .FALSE.
[2698]	336	cross_wall_z = .FALSE.
[1929]	337	!
	338	!-- Initialize flags to check if a wall is reached
	339	reach_x = .FALSE.
	340	reach_y = .FALSE.
	341	reach_z = .FALSE.
	342	!
	343	!-- Initialize flags to check if a particle was already reflected
[2698]	344	reflect_x = .FALSE.
	345	reflect_y = .FALSE.
	346	reflect_z = .FALSE.
[1929]	347	!
[2698]	348	!-- Initialize flags to check if a wall is already crossed.
[1929]	349	!-- ( Required to obtain correct indices. )
	350	x_wall_reached = .FALSE.
	351	y_wall_reached = .FALSE.
[2698]	352	z_wall_reached = .FALSE.
[1929]	353	!
	354	!-- Initialize time array
	355	t = 0.0_wp
	356	!
	357	!-- Check if particle can reach any wall. This case, calculate the
	358	!-- fractional time needed to reach this wall. Store this fractional
	359	!-- timestep in array t. Moreover, store indices for these grid
	360	!-- boxes where the respective wall belongs to.
	361	!-- Start with x-direction.
	362	t_index = 1
	363	t(t_index) = ( xwall - pos_x_old ) &
	364	/ MERGE( MAX( prt_x - pos_x_old, 1E-30_wp ), &
	365	MIN( prt_x - pos_x_old, -1E-30_wp ), &
	366	prt_x > pos_x_old )
	367	x_ind(t_index) = i2
	368	y_ind(t_index) = j1
[2698]	369	z_ind(t_index) = k1
[1929]	370	reach_x(t_index) = .TRUE.
	371	reach_y(t_index) = .FALSE.
	372	reach_z(t_index) = .FALSE.
	373	!
	374	!-- Store these values only if particle really reaches any wall. t must
	375	!-- be in a interval between [0:1].
	376	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	377	t_index = t_index + 1
	378	cross_wall_x = .TRUE.
	379	ENDIF
	380	!
	381	!-- y-direction
	382	t(t_index) = ( ywall - pos_y_old ) &
	383	/ MERGE( MAX( prt_y - pos_y_old, 1E-30_wp ), &
	384	MIN( prt_y - pos_y_old, -1E-30_wp ), &
	385	prt_y > pos_y_old )
	386	x_ind(t_index) = i1
	387	y_ind(t_index) = j2
[2698]	388	z_ind(t_index) = k1
[1929]	389	reach_x(t_index) = .FALSE.
	390	reach_y(t_index) = .TRUE.
	391	reach_z(t_index) = .FALSE.
	392	IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN
	393	t_index = t_index + 1
	394	cross_wall_y = .TRUE.
	395	ENDIF
	396	!
	397	!-- z-direction
[2698]	398	t(t_index) = (zwall - pos_z_old ) &
	399	/ MERGE( MAX( prt_z - pos_z_old, 1E-30_wp ), &
	400	MIN( prt_z - pos_z_old, -1E-30_wp ), &
	401	prt_z > pos_z_old )
	402
	403	x_ind(t_index) = i1
	404	y_ind(t_index) = j1
	405	z_ind(t_index) = k2
	406	reach_x(t_index) = .FALSE.
	407	reach_y(t_index) = .FALSE.
	408	reach_z(t_index) = .TRUE.
	409	IF( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp) THEN
	410	t_index = t_index + 1
	411	cross_wall_z = .TRUE.
	412	ENDIF
	413
[1929]	414	t_index_number = t_index - 1
[58]	415	!
[1929]	416	!-- Carry out reflection only if particle reaches any wall
[2698]	417	IF ( cross_wall_x .OR. cross_wall_y .OR. cross_wall_z ) THEN
[58]	418	!
[1929]	419	!-- Sort fractional timesteps in ascending order. Also sort the
	420	!-- corresponding indices and flag according to the time interval a
	421	!-- particle reaches the respective wall.
	422	inc = 1
	423	jr = 1
	424	DO WHILE ( inc <= t_index_number )
	425	inc = 3 * inc + 1
	426	ENDDO
[58]	427
[1929]	428	DO WHILE ( inc > 1 )
	429	inc = inc / 3
	430	DO ir = inc+1, t_index_number
	431	tmp_t = t(ir)
	432	tmp_x = x_ind(ir)
	433	tmp_y = y_ind(ir)
[2698]	434	tmp_z = z_ind(ir)
[1929]	435	tmp_reach_x = reach_x(ir)
	436	tmp_reach_y = reach_y(ir)
	437	tmp_reach_z = reach_z(ir)
	438	jr = ir
	439	DO WHILE ( t(jr-inc) > tmp_t )
	440	t(jr) = t(jr-inc)
	441	x_ind(jr) = x_ind(jr-inc)
	442	y_ind(jr) = y_ind(jr-inc)
[2698]	443	z_ind(jr) = z_ind(jr-inc)
[1929]	444	reach_x(jr) = reach_x(jr-inc)
	445	reach_y(jr) = reach_y(jr-inc)
	446	reach_z(jr) = reach_z(jr-inc)
	447	jr = jr - inc
	448	IF ( jr <= inc ) EXIT
[58]	449	ENDDO
[1929]	450	t(jr) = tmp_t
	451	x_ind(jr) = tmp_x
	452	y_ind(jr) = tmp_y
[2698]	453	z_ind(jr) = tmp_z
[1929]	454	reach_x(jr) = tmp_reach_x
	455	reach_y(jr) = tmp_reach_y
	456	reach_z(jr) = tmp_reach_z
[58]	457	ENDDO
[1929]	458	ENDDO
[58]	459	!
[1929]	460	!-- Initialize temporary particle positions
	461	pos_x = pos_x_old
	462	pos_y = pos_y_old
	463	pos_z = pos_z_old
	464	!
	465	!-- Loop over all times a particle possibly moves into a new grid box
	466	t_old = 0.0_wp
	467	DO t_index = 1, t_index_number
	468	!
	469	!-- Calculate intermediate particle position according to the
	470	!-- timesteps a particle reaches any wall.
	471	pos_x = pos_x + ( t(t_index) - t_old ) * dt_particle &
	472	* particles(n)%speed_x
	473	pos_y = pos_y + ( t(t_index) - t_old ) * dt_particle &
	474	* particles(n)%speed_y
	475	pos_z = pos_z + ( t(t_index) - t_old ) * dt_particle &
	476	* particles(n)%speed_z
	477	!
	478	!-- Obtain x/y grid indices for intermediate particle position from
	479	!-- sorted index array
	480	i3 = x_ind(t_index)
	481	j3 = y_ind(t_index)
[2698]	482	k3 = z_ind(t_index)
[1929]	483	!
	484	!-- Check which wall is already reached
	485	IF ( .NOT. x_wall_reached ) x_wall_reached = reach_x(t_index)
[2698]	486	IF ( .NOT. y_wall_reached ) y_wall_reached = reach_y(t_index)
	487	IF ( .NOT. z_wall_reached ) z_wall_reached = reach_z(t_index)
[1929]	488	!
	489	!-- Check if a particle needs to be reflected at any yz-wall. If
	490	!-- necessary, carry out reflection. Please note, a security
[2698]	491	!-- constant is required, as the particle position does not
[1929]	492	!-- necessarily exactly match the wall location due to rounding
[2698]	493	!-- errors.
	494	IF ( reach_x(t_index) .AND. &
	495	ABS( pos_x - xwall ) < eps .AND. &
	496	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	497	.NOT. reflect_x ) THEN
[2698]	498	!
	499	!
[1929]	500	!-- Reflection in x-direction.
	501	!-- Ensure correct reflection by MIN/MAX functions, depending on
	502	!-- direction of particle transport.
[2698]	503	!-- Due to rounding errors pos_x does not exactly match the wall
[1929]	504	!-- location, leading to erroneous reflection.
	505	pos_x = MERGE( MIN( 2.0_wp * xwall - pos_x, xwall ), &
	506	MAX( 2.0_wp * xwall - pos_x, xwall ), &
	507	particles(n)%x > xwall )
	508	!
	509	!-- Change sign of particle speed
	510	particles(n)%speed_x = - particles(n)%speed_x
	511	!
[2698]	512	!-- Also change sign of subgrid-scale particle speed
[1929]	513	particles(n)%rvar1 = - particles(n)%rvar1
	514	!
	515	!-- Set flag that reflection along x is already done
	516	reflect_x = .TRUE.
	517	!
[2698]	518	!-- As the particle does not cross any further yz-wall during
[1929]	519	!-- this timestep, set further x-indices to the current one.
	520	x_ind(t_index:t_index_number) = i1
	521	!
	522	!-- If particle already reached the wall but was not reflected,
	523	!-- set further x-indices to the new one.
	524	ELSEIF ( x_wall_reached .AND. .NOT. reflect_x ) THEN
	525	x_ind(t_index:t_index_number) = i2
[2698]	526	ENDIF !particle reflection in x direction done
	527
[1929]	528	!
	529	!-- Check if a particle needs to be reflected at any xz-wall. If
[2698]	530	!-- necessary, carry out reflection. Please note, a security
	531	!-- constant is required, as the particle position does not
	532	!-- necessarily exactly match the wall location due to rounding
	533	!-- errors.
	534	IF ( reach_y(t_index) .AND. &
	535	ABS( pos_y - ywall ) < eps .AND. &
	536	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
	537	.NOT. reflect_y ) THEN
	538	!
	539	!
	540	!-- Reflection in y-direction.
	541	!-- Ensure correct reflection by MIN/MAX functions, depending on
	542	!-- direction of particle transport.
	543	!-- Due to rounding errors pos_y does not exactly match the wall
	544	!-- location, leading to erroneous reflection.
[1929]	545	pos_y = MERGE( MIN( 2.0_wp * ywall - pos_y, ywall ), &
	546	MAX( 2.0_wp * ywall - pos_y, ywall ), &
[2698]	547	particles(n)%y > ywall )
	548	!
	549	!-- Change sign of particle speed
	550	particles(n)%speed_y = - particles(n)%speed_y
	551	!
	552	!-- Also change sign of subgrid-scale particle speed
	553	particles(n)%rvar2 = - particles(n)%rvar2
	554	!
	555	!-- Set flag that reflection along y is already done
	556	reflect_y = .TRUE.
	557	!
	558	!-- As the particle does not cross any further xz-wall during
	559	!-- this timestep, set further y-indices to the current one.
[1929]	560	y_ind(t_index:t_index_number) = j1
[2698]	561	!
	562	!-- If particle already reached the wall but was not reflected,
	563	!-- set further y-indices to the new one.
[1929]	564	ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN
[2698]	565	y_ind(t_index:t_index_number) = j2
	566	ENDIF !particle reflection in y direction done
	567
[58]	568	!
[1929]	569	!-- Check if a particle needs to be reflected at any xy-wall. If
[2698]	570	!-- necessary, carry out reflection. Please note, a security
	571	!-- constant is required, as the particle position does not
	572	!-- necessarily exactly match the wall location due to rounding
	573	!-- errors.
	574	IF ( reach_z(t_index) .AND. &
	575	ABS( pos_z - zwall ) < eps .AND. &
	576	.NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. &
[1929]	577	.NOT. reflect_z ) THEN
[2698]	578	!
	579	!
	580	!-- Reflection in z-direction.
	581	!-- Ensure correct reflection by MIN/MAX functions, depending on
	582	!-- direction of particle transport.
	583	!-- Due to rounding errors pos_z does not exactly match the wall
	584	!-- location, leading to erroneous reflection.
	585	pos_z = MERGE( MIN( 2.0_wp * zwall - pos_z, zwall ), &
	586	MAX( 2.0_wp * zwall - pos_z, zwall ), &
	587	particles(n)%z > zwall )
[2232]	588	!
[2698]	589	!-- Change sign of particle speed
	590	particles(n)%speed_z = - particles(n)%speed_z
[58]	591	!
[2698]	592	!-- Also change sign of subgrid-scale particle speed
	593	particles(n)%rvar3 = - particles(n)%rvar3
	594	!
	595	!-- Set flag that reflection along z is already done
	596	reflect_z = .TRUE.
	597	!
	598	!-- As the particle does not cross any further xy-wall during
	599	!-- this timestep, set further z-indices to the current one.
	600	z_ind(t_index:t_index_number) = k1
	601	!
	602	!-- If particle already reached the wall but was not reflected,
	603	!-- set further z-indices to the new one.
	604	ELSEIF ( z_wall_reached .AND. .NOT. reflect_z ) THEN
	605	z_ind(t_index:t_index_number) = k2
	606	ENDIF !particle reflection in z direction done
	607
	608	!
[1929]	609	!-- Swap time
	610	t_old = t(t_index)
[58]	611
[1929]	612	ENDDO
[61]	613	!
[1929]	614	!-- If a particle was reflected, calculate final position from last
	615	!-- intermediate position.
	616	IF ( reflect_x .OR. reflect_y .OR. reflect_z ) THEN
[61]	617
[1929]	618	particles(n)%x = pos_x + ( 1.0_wp - t_old ) * dt_particle &
	619	* particles(n)%speed_x
	620	particles(n)%y = pos_y + ( 1.0_wp - t_old ) * dt_particle &
	621	* particles(n)%speed_y
	622	particles(n)%z = pos_z + ( 1.0_wp - t_old ) * dt_particle &
	623	* particles(n)%speed_z
[61]	624
[849]	625	ENDIF
[61]	626
[1929]	627	ENDIF
[61]	628
[849]	629	ENDDO
[58]	630
[849]	631	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' )
[58]	632
[849]	633	ENDIF
[61]	634
[849]	635	END SUBROUTINE lpm_boundary_conds

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