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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 1966

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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	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: lpm_boundary_conds.f90 1930 2016-06-09 16:32:12Z maronga $
26	!
27	! 1929 2016-06-09 16:25:25Z suehring
28	! Rewritten wall reflection
29	!
30	! 1822 2016-04-07 07:49:42Z hoffmann
31	! Tails removed. Unused variables removed.
32	!
33	! 1682 2015-10-07 23:56:08Z knoop
34	! Code annotations made doxygen readable
35	!
36	! 1359 2014-04-11 17:15:14Z hoffmann
37	! New particle structure integrated.
38	! Kind definition added to all floating point numbers.
39	!
40	! 1320 2014-03-20 08:40:49Z raasch
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
47	!
48	! 1036 2012-10-22 13:43:42Z raasch
49	! code put under GPL (PALM 3.9)
50	!
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	!
55	! 824 2012-02-17 09:09:57Z raasch
56	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3
57	!
58	! Initial version (2007/03/09)
59	!
60	! Description:
61	! ------------
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_*)
75	!------------------------------------------------------------------------------!
76	SUBROUTINE lpm_boundary_conds( range )
77
78
79	USE arrays_3d, &
80	ONLY: zu, zw
81
82	USE control_parameters, &
83	ONLY: dz, message_string, particle_maximum_age
84
85	USE cpulog, &
86	ONLY: cpu_log, log_point_s
87
88	USE grid_variables, &
89	ONLY: ddx, dx, ddy, dy
90
91	USE indices, &
92	ONLY: nxl, nxr, nyn, nys, nz, nzb_s_inner
93
94	USE kinds
95
96	USE particle_attributes, &
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
100
101	USE pegrid
102
103	IMPLICIT NONE
104
105	CHARACTER (LEN=*) :: range !<
106
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
124
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
136
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
140
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
165	IF ( range == 'bottom/top' ) THEN
166
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
171
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
180
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
185
186	IF ( particles(n)%age > particle_maximum_age .AND. &
187	particles(n)%particle_mask ) &
188	THEN
189	particles(n)%particle_mask = .FALSE.
190	deleted_particles = deleted_particles + 1
191	ENDIF
192
193	IF ( particles(n)%z >= zu(nz) .AND. particles(n)%particle_mask ) THEN
194	IF ( ibc_par_t == 1 ) THEN
195	!
196	!-- Particle absorption
197	particles(n)%particle_mask = .FALSE.
198	deleted_particles = deleted_particles + 1
199	ELSEIF ( ibc_par_t == 2 ) THEN
200	!
201	!-- Particle reflection
202	particles(n)%z = 2.0_wp * zu(nz) - particles(n)%z
203	particles(n)%speed_z = -particles(n)%speed_z
204	IF ( use_sgs_for_particles .AND. &
205	particles(n)%rvar3 > 0.0_wp ) THEN
206	particles(n)%rvar3 = -particles(n)%rvar3
207	ENDIF
208	ENDIF
209	ENDIF
210
211	IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN
212	IF ( ibc_par_b == 1 ) THEN
213	!
214	!-- Particle absorption
215	particles(n)%particle_mask = .FALSE.
216	deleted_particles = deleted_particles + 1
217	ELSEIF ( ibc_par_b == 2 ) THEN
218	!
219	!-- Particle reflection
220	particles(n)%z = 2.0_wp * zw(0) - particles(n)%z
221	particles(n)%speed_z = -particles(n)%speed_z
222	IF ( use_sgs_for_particles .AND. &
223	particles(n)%rvar3 < 0.0_wp ) THEN
224	particles(n)%rvar3 = -particles(n)%rvar3
225	ENDIF
226	ENDIF
227	ENDIF
228	ENDDO
229
230	ELSEIF ( range == 'walls' ) THEN
231
232
233	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' )
234
235	DO n = 1, number_of_particles
236	!
237	!-- Recalculate particle timestep
238	dt_particle = particles(n)%age - particles(n)%age_m
239	!
240	!-- Obtain x/y indices for current particle position
241	i2 = ( particles(n)%x + 0.5_wp * dx ) * ddx
242	j2 = ( particles(n)%y + 0.5_wp * dy ) * ddy
243	!
244	!-- Save current particle positions
245	prt_x = particles(n)%x
246	prt_y = particles(n)%y
247	prt_z = particles(n)%z
248	!
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
253	!
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
257	!
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
350
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 )
355
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
364
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
373
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
382
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
391
392	END IF
393	t_index_number = t_index - 1
394	!
395	!-- Carry out reflection only if particle reaches any wall
396	IF ( cross_wall_x .OR. cross_wall_y .OR. downwards ) THEN
397	!
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
406
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
426	ENDDO
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
433	ENDDO
434	ENDDO
435	!
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
507
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 )
511
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
517
518	ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN
519	y_ind(t_index:t_index_number) = j2
520	ENDIF
521	!
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)) )
530
531	particles(n)%speed_z = - particles(n)%speed_z
532	particles(n)%rvar3 = - particles(n)%rvar3
533
534	reflect_z = .TRUE.
535
536	ENDIF
537
538	ENDIF
539	!
540	!-- Swap time
541	t_old = t(t_index)
542
543	ENDDO
544	!
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
548
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
555
556	ENDIF
557
558	ENDIF
559
560	ENDDO
561
562	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' )
563
564	ENDIF
565
566	END SUBROUTINE lpm_boundary_conds

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