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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 1929

Last change on this file since 1929 was 1929, checked in by suehring, 8 years ago
several bugfixes in particle model and serial mode
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File size: 24.0 KB

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

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