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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 1172

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1	SUBROUTINE lpm_boundary_conds( range )
2
3	!--------------------------------------------------------------------------------!
4	! This file is part of PALM.
5	!
6	! PALM is free software: you can redistribute it and/or modify it under the terms
7	! of the GNU General Public License as published by the Free Software Foundation,
8	! either version 3 of the License, or (at your option) any later version.
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	!
17	! Copyright 1997-2012 Leibniz University Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: lpm_boundary_conds.f90 1037 2012-10-22 14:10:22Z raasch $
27	!
28	! 1036 2012-10-22 13:43:42Z raasch
29	! code put under GPL (PALM 3.9)
30	!
31	! 849 2012-03-15 10:35:09Z raasch
32	! routine renamed lpm_boundary_conds, bottom and top boundary conditions
33	! included (former part of advec_particles)
34	!
35	! 824 2012-02-17 09:09:57Z raasch
36	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3
37	!
38	! 150 2008-02-29 08:19:58Z raasch
39	! Vertical index calculations adjusted for ocean runs.
40	!
41	! Initial version (2007/03/09)
42	!
43	! Description:
44	! ------------
45	! Boundary conditions for the Lagrangian particles.
46	! The routine consists of two different parts. One handles the bottom (flat)
47	! and top boundary. In this part, also particles which exceeded their lifetime
48	! are deleted.
49	! The other part handles the reflection of particles from vertical walls.
50	! This part was developed by Jin Zhang during 2006-2007.
51	!
52	! To do: Code structure for finding the t_index values and for checking the
53	! ----- reflection conditions is basically the same for all four cases, so it
54	! should be possible to further simplify/shorten it.
55	!
56	! THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!!
57	! (see offset_ocean_*)
58	!------------------------------------------------------------------------------!
59
60	USE arrays_3d
61	USE control_parameters
62	USE cpulog
63	USE grid_variables
64	USE indices
65	USE interfaces
66	USE particle_attributes
67	USE pegrid
68
69	IMPLICIT NONE
70
71	CHARACTER (LEN=*) :: range
72
73	INTEGER :: i, inc, ir, i1, i2, i3, i5, j, jr, j1, j2, j3, j5, k, k1, k2, &
74	k3, k5, n, nn, t_index, t_index_number
75
76	LOGICAL :: reflect_x, reflect_y, reflect_z
77
78	REAL :: dt_particle, pos_x, pos_x_old, pos_y, pos_y_old, pos_z, &
79	pos_z_old, prt_x, prt_y, prt_z, tmp_t, xline, yline, zline
80
81	REAL :: t(1:200)
82
83
84
85	IF ( range == 'bottom/top' ) THEN
86
87	!
88	!-- Apply boundary conditions to those particles that have crossed the top or
89	!-- bottom boundary and delete those particles, which are older than allowed
90	DO n = 1, number_of_particles
91
92	nn = particles(n)%tail_id
93
94	!
95	!-- Stop if particles have moved further than the length of one
96	!-- PE subdomain (newly released particles have age = age_m!)
97	IF ( particles(n)%age /= particles(n)%age_m ) THEN
98	IF ( ABS(particles(n)%speed_x) > &
99	((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. &
100	ABS(particles(n)%speed_y) > &
101	((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN
102
103	WRITE( message_string, * ) 'particle too fast. n = ', n
104	CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 )
105	ENDIF
106	ENDIF
107
108	IF ( particles(n)%age > particle_maximum_age .AND. &
109	particle_mask(n) ) &
110	THEN
111	particle_mask(n) = .FALSE.
112	deleted_particles = deleted_particles + 1
113	IF ( use_particle_tails .AND. nn /= 0 ) THEN
114	tail_mask(nn) = .FALSE.
115	deleted_tails = deleted_tails + 1
116	ENDIF
117	ENDIF
118
119	IF ( particles(n)%z >= zu(nz) .AND. particle_mask(n) ) THEN
120	IF ( ibc_par_t == 1 ) THEN
121	!
122	!-- Particle absorption
123	particle_mask(n) = .FALSE.
124	deleted_particles = deleted_particles + 1
125	IF ( use_particle_tails .AND. nn /= 0 ) THEN
126	tail_mask(nn) = .FALSE.
127	deleted_tails = deleted_tails + 1
128	ENDIF
129	ELSEIF ( ibc_par_t == 2 ) THEN
130	!
131	!-- Particle reflection
132	particles(n)%z = 2.0 * zu(nz) - particles(n)%z
133	particles(n)%speed_z = -particles(n)%speed_z
134	IF ( use_sgs_for_particles .AND. &
135	particles(n)%rvar3 > 0.0 ) THEN
136	particles(n)%rvar3 = -particles(n)%rvar3
137	ENDIF
138	IF ( use_particle_tails .AND. nn /= 0 ) THEN
139	particle_tail_coordinates(1,3,nn) = 2.0 * zu(nz) - &
140	particle_tail_coordinates(1,3,nn)
141	ENDIF
142	ENDIF
143	ENDIF
144	IF ( particles(n)%z < zw(0) .AND. particle_mask(n) ) THEN
145	IF ( ibc_par_b == 1 ) THEN
146	!
147	!-- Particle absorption
148	particle_mask(n) = .FALSE.
149	deleted_particles = deleted_particles + 1
150	IF ( use_particle_tails .AND. nn /= 0 ) THEN
151	tail_mask(nn) = .FALSE.
152	deleted_tails = deleted_tails + 1
153	ENDIF
154	ELSEIF ( ibc_par_b == 2 ) THEN
155	!
156	!-- Particle reflection
157	particles(n)%z = 2.0 * zw(0) - particles(n)%z
158	particles(n)%speed_z = -particles(n)%speed_z
159	IF ( use_sgs_for_particles .AND. &
160	particles(n)%rvar3 < 0.0 ) THEN
161	particles(n)%rvar3 = -particles(n)%rvar3
162	ENDIF
163	IF ( use_particle_tails .AND. nn /= 0 ) THEN
164	particle_tail_coordinates(1,3,nn) = 2.0 * zu(nz) - &
165	particle_tail_coordinates(1,3,nn)
166	ENDIF
167	IF ( use_particle_tails .AND. nn /= 0 ) THEN
168	particle_tail_coordinates(1,3,nn) = 2.0 * zw(0) - &
169	particle_tail_coordinates(1,3,nn)
170	ENDIF
171	ENDIF
172	ENDIF
173	ENDDO
174
175	ELSEIF ( range == 'walls' ) THEN
176
177	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' )
178
179	reflect_x = .FALSE.
180	reflect_y = .FALSE.
181	reflect_z = .FALSE.
182
183	DO n = 1, number_of_particles
184
185	dt_particle = particles(n)%age - particles(n)%age_m
186
187	i2 = ( particles(n)%x + 0.5 * dx ) * ddx
188	j2 = ( particles(n)%y + 0.5 * dy ) * ddy
189	k2 = particles(n)%z / dz + 1 + offset_ocean_nzt_m1
190
191	prt_x = particles(n)%x
192	prt_y = particles(n)%y
193	prt_z = particles(n)%z
194
195	!
196	!-- If the particle position is below the surface, it has to be reflected
197	IF ( k2 <= nzb_s_inner(j2,i2) .AND. nzb_s_inner(j2,i2) /=0 ) THEN
198
199	pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle
200	pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle
201	pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle
202	i1 = ( pos_x_old + 0.5 * dx ) * ddx
203	j1 = ( pos_y_old + 0.5 * dy ) * ddy
204	k1 = pos_z_old / dz + offset_ocean_nzt_m1
205
206	!
207	!-- Case 1
208	IF ( particles(n)%x > pos_x_old .AND. particles(n)%y > pos_y_old )&
209	THEN
210	t_index = 1
211
212	DO i = i1, i2
213	xline = i * dx + 0.5 * dx
214	t(t_index) = ( xline - pos_x_old ) / &
215	( particles(n)%x - pos_x_old )
216	t_index = t_index + 1
217	ENDDO
218
219	DO j = j1, j2
220	yline = j * dy + 0.5 * dy
221	t(t_index) = ( yline - pos_y_old ) / &
222	( particles(n)%y - pos_y_old )
223	t_index = t_index + 1
224	ENDDO
225
226	IF ( particles(n)%z < pos_z_old ) THEN
227	DO k = k1, k2 , -1
228	zline = k * dz
229	t(t_index) = ( pos_z_old - zline ) / &
230	( pos_z_old - particles(n)%z )
231	t_index = t_index + 1
232	ENDDO
233	ENDIF
234
235	t_index_number = t_index - 1
236
237	!
238	!-- Sorting t
239	inc = 1
240	jr = 1
241	DO WHILE ( inc <= t_index_number )
242	inc = 3 * inc + 1
243	ENDDO
244
245	DO WHILE ( inc > 1 )
246	inc = inc / 3
247	DO ir = inc+1, t_index_number
248	tmp_t = t(ir)
249	jr = ir
250	DO WHILE ( t(jr-inc) > tmp_t )
251	t(jr) = t(jr-inc)
252	jr = jr - inc
253	IF ( jr <= inc ) EXIT
254	ENDDO
255	t(jr) = tmp_t
256	ENDDO
257	ENDDO
258
259	case1: DO t_index = 1, t_index_number
260
261	pos_x = pos_x_old + t(t_index) * ( prt_x - pos_x_old )
262	pos_y = pos_y_old + t(t_index) * ( prt_y - pos_y_old )
263	pos_z = pos_z_old + t(t_index) * ( prt_z - pos_z_old )
264
265	i3 = ( pos_x + 0.5 * dx ) * ddx
266	j3 = ( pos_y + 0.5 * dy ) * ddy
267	k3 = pos_z / dz + offset_ocean_nzt_m1
268
269	i5 = pos_x * ddx
270	j5 = pos_y * ddy
271	k5 = pos_z / dz + offset_ocean_nzt_m1
272
273	IF ( k5 <= nzb_s_inner(j5,i3) .AND. &
274	nzb_s_inner(j5,i3) /= 0 ) THEN
275
276	IF ( pos_z == nzb_s_inner(j5,i3) * dz .AND. &
277	k3 == nzb_s_inner(j5,i3) ) THEN
278	reflect_z = .TRUE.
279	EXIT case1
280	ENDIF
281
282	ENDIF
283
284	IF ( k5 <= nzb_s_inner(j3,i5) .AND. &
285	nzb_s_inner(j3,i5) /= 0 ) THEN
286
287	IF ( pos_z == nzb_s_inner(j3,i5) * dz .AND. &
288	k3 == nzb_s_inner(j3,i5) ) THEN
289	reflect_z = .TRUE.
290	EXIT case1
291	ENDIF
292
293	ENDIF
294
295	IF ( k3 <= nzb_s_inner(j3,i3) .AND. &
296	nzb_s_inner(j3,i3) /= 0 ) THEN
297
298	IF ( pos_z == nzb_s_inner(j3,i3) * dz .AND. &
299	k3 == nzb_s_inner(j3,i3) ) THEN
300	reflect_z = .TRUE.
301	EXIT case1
302	ENDIF
303
304	IF ( pos_y == ( j3 * dy - 0.5 * dy ) .AND. &
305	pos_z < nzb_s_inner(j3,i3) * dz ) THEN
306	reflect_y = .TRUE.
307	EXIT case1
308	ENDIF
309
310	IF ( pos_x == ( i3 * dx - 0.5 * dx ) .AND. &
311	pos_z < nzb_s_inner(j3,i3) * dz ) THEN
312	reflect_x = .TRUE.
313	EXIT case1
314	ENDIF
315
316	ENDIF
317
318	ENDDO case1
319
320	!
321	!-- Case 2
322	ELSEIF ( particles(n)%x > pos_x_old .AND. &
323	particles(n)%y < pos_y_old ) THEN
324
325	t_index = 1
326
327	DO i = i1, i2
328	xline = i * dx + 0.5 * dx
329	t(t_index) = ( xline - pos_x_old ) / &
330	( particles(n)%x - pos_x_old )
331	t_index = t_index + 1
332	ENDDO
333
334	DO j = j1, j2, -1
335	yline = j * dy - 0.5 * dy
336	t(t_index) = ( pos_y_old - yline ) / &
337	( pos_y_old - particles(n)%y )
338	t_index = t_index + 1
339	ENDDO
340
341	IF ( particles(n)%z < pos_z_old ) THEN
342	DO k = k1, k2 , -1
343	zline = k * dz
344	t(t_index) = ( pos_z_old - zline ) / &
345	( pos_z_old - particles(n)%z )
346	t_index = t_index + 1
347	ENDDO
348	ENDIF
349	t_index_number = t_index-1
350
351	!
352	!-- Sorting t
353	inc = 1
354	jr = 1
355	DO WHILE ( inc <= t_index_number )
356	inc = 3 * inc + 1
357	ENDDO
358
359	DO WHILE ( inc > 1 )
360	inc = inc / 3
361	DO ir = inc+1, t_index_number
362	tmp_t = t(ir)
363	jr = ir
364	DO WHILE ( t(jr-inc) > tmp_t )
365	t(jr) = t(jr-inc)
366	jr = jr - inc
367	IF ( jr <= inc ) EXIT
368	ENDDO
369	t(jr) = tmp_t
370	ENDDO
371	ENDDO
372
373	case2: DO t_index = 1, t_index_number
374
375	pos_x = pos_x_old + t(t_index) * ( prt_x - pos_x_old )
376	pos_y = pos_y_old + t(t_index) * ( prt_y - pos_y_old )
377	pos_z = pos_z_old + t(t_index) * ( prt_z - pos_z_old )
378
379	i3 = ( pos_x + 0.5 * dx ) * ddx
380	j3 = ( pos_y + 0.5 * dy ) * ddy
381	k3 = pos_z / dz + offset_ocean_nzt_m1
382
383	i5 = pos_x * ddx
384	j5 = pos_y * ddy
385	k5 = pos_z / dz + offset_ocean_nzt_m1
386
387	IF ( k5 <= nzb_s_inner(j3,i5) .AND. &
388	nzb_s_inner(j3,i5) /= 0 ) THEN
389
390	IF ( pos_z == nzb_s_inner(j3,i5) * dz .AND. &
391	k3 == nzb_s_inner(j3,i5) ) THEN
392	reflect_z = .TRUE.
393	EXIT case2
394	ENDIF
395
396	ENDIF
397
398	IF ( k3 <= nzb_s_inner(j3,i3) .AND. &
399	nzb_s_inner(j3,i3) /= 0 ) THEN
400
401	IF ( pos_z == nzb_s_inner(j3,i3) * dz .AND. &
402	k3 == nzb_s_inner(j3,i3) ) THEN
403	reflect_z = .TRUE.
404	EXIT case2
405	ENDIF
406
407	IF ( pos_x == ( i3 * dx - 0.5 * dx ) .AND. &
408	pos_z < nzb_s_inner(j3,i3) * dz ) THEN
409	reflect_x = .TRUE.
410	EXIT case2
411	ENDIF
412
413	ENDIF
414
415	IF ( k5 <= nzb_s_inner(j5,i3) .AND. &
416	nzb_s_inner(j5,i3) /= 0 ) THEN
417
418	IF ( pos_z == nzb_s_inner(j5,i3) * dz .AND. &
419	k3 == nzb_s_inner(j5,i3) ) THEN
420	reflect_z = .TRUE.
421	EXIT case2
422	ENDIF
423
424	IF ( pos_y == ( j5 * dy + 0.5 * dy ) .AND. &
425	pos_z < nzb_s_inner(j5,i3) * dz ) THEN
426	reflect_y = .TRUE.
427	EXIT case2
428	ENDIF
429
430	ENDIF
431
432	ENDDO case2
433
434	!
435	!-- Case 3
436	ELSEIF ( particles(n)%x < pos_x_old .AND. &
437	particles(n)%y > pos_y_old ) THEN
438
439	t_index = 1
440
441	DO i = i1, i2, -1
442	xline = i * dx - 0.5 * dx
443	t(t_index) = ( pos_x_old - xline ) / &
444	( pos_x_old - particles(n)%x )
445	t_index = t_index + 1
446	ENDDO
447
448	DO j = j1, j2
449	yline = j * dy + 0.5 * dy
450	t(t_index) = ( yline - pos_y_old ) / &
451	( particles(n)%y - pos_y_old )
452	t_index = t_index + 1
453	ENDDO
454
455	IF ( particles(n)%z < pos_z_old ) THEN
456	DO k = k1, k2 , -1
457	zline = k * dz
458	t(t_index) = ( pos_z_old - zline ) / &
459	( pos_z_old - particles(n)%z )
460	t_index = t_index + 1
461	ENDDO
462	ENDIF
463	t_index_number = t_index - 1
464
465	!
466	!-- Sorting t
467	inc = 1
468	jr = 1
469
470	DO WHILE ( inc <= t_index_number )
471	inc = 3 * inc + 1
472	ENDDO
473
474	DO WHILE ( inc > 1 )
475	inc = inc / 3
476	DO ir = inc+1, t_index_number
477	tmp_t = t(ir)
478	jr = ir
479	DO WHILE ( t(jr-inc) > tmp_t )
480	t(jr) = t(jr-inc)
481	jr = jr - inc
482	IF ( jr <= inc ) EXIT
483	ENDDO
484	t(jr) = tmp_t
485	ENDDO
486	ENDDO
487
488	case3: DO t_index = 1, t_index_number
489
490	pos_x = pos_x_old + t(t_index) * ( prt_x - pos_x_old )
491	pos_y = pos_y_old + t(t_index) * ( prt_y - pos_y_old )
492	pos_z = pos_z_old + t(t_index) * ( prt_z - pos_z_old )
493
494	i3 = ( pos_x + 0.5 * dx ) * ddx
495	j3 = ( pos_y + 0.5 * dy ) * ddy
496	k3 = pos_z / dz + offset_ocean_nzt_m1
497
498	i5 = pos_x * ddx
499	j5 = pos_y * ddy
500	k5 = pos_z / dz + offset_ocean_nzt_m1
501
502	IF ( k5 <= nzb_s_inner(j5,i3) .AND. &
503	nzb_s_inner(j5,i3) /= 0 ) THEN
504
505	IF ( pos_z == nzb_s_inner(j5,i3) * dz .AND. &
506	k3 == nzb_s_inner(j5,i3) ) THEN
507	reflect_z = .TRUE.
508	EXIT case3
509	ENDIF
510
511	ENDIF
512
513	IF ( k3 <= nzb_s_inner(j3,i3) .AND. &
514	nzb_s_inner(j3,i3) /= 0 ) THEN
515
516	IF ( pos_z == nzb_s_inner(j3,i3) * dz .AND. &
517	k3 == nzb_s_inner(j3,i3) ) THEN
518	reflect_z = .TRUE.
519	EXIT case3
520	ENDIF
521
522	IF ( pos_y == ( j3 * dy - 0.5 * dy ) .AND. &
523	pos_z < nzb_s_inner(j3,i3) * dz ) THEN
524	reflect_y = .TRUE.
525	EXIT case3
526	ENDIF
527
528	ENDIF
529
530	IF ( k5 <= nzb_s_inner(j3,i5) .AND. &
531	nzb_s_inner(j3,i5) /= 0 ) THEN
532
533	IF ( pos_z == nzb_s_inner(j3,i5) * dz .AND. &
534	k3 == nzb_s_inner(j3,i5) ) THEN
535	reflect_z = .TRUE.
536	EXIT case3
537	ENDIF
538
539	IF ( pos_x == ( i5 * dx + 0.5 * dx ) .AND. &
540	pos_z < nzb_s_inner(j3,i5) * dz ) THEN
541	reflect_x = .TRUE.
542	EXIT case3
543	ENDIF
544
545	ENDIF
546
547	ENDDO case3
548
549	!
550	!-- Case 4
551	ELSEIF ( particles(n)%x < pos_x_old .AND. &
552	particles(n)%y < pos_y_old ) THEN
553
554	t_index = 1
555
556	DO i = i1, i2, -1
557	xline = i * dx - 0.5 * dx
558	t(t_index) = ( pos_x_old - xline ) / &
559	( pos_x_old - particles(n)%x )
560	t_index = t_index + 1
561	ENDDO
562
563	DO j = j1, j2, -1
564	yline = j * dy - 0.5 * dy
565	t(t_index) = ( pos_y_old - yline ) / &
566	( pos_y_old - particles(n)%y )
567	t_index = t_index + 1
568	ENDDO
569
570	IF ( particles(n)%z < pos_z_old ) THEN
571	DO k = k1, k2 , -1
572	zline = k * dz
573	t(t_index) = ( pos_z_old - zline ) / &
574	( pos_z_old-particles(n)%z )
575	t_index = t_index + 1
576	ENDDO
577	ENDIF
578	t_index_number = t_index-1
579
580	!
581	!-- Sorting t
582	inc = 1
583	jr = 1
584
585	DO WHILE ( inc <= t_index_number )
586	inc = 3 * inc + 1
587	ENDDO
588
589	DO WHILE ( inc > 1 )
590	inc = inc / 3
591	DO ir = inc+1, t_index_number
592	tmp_t = t(ir)
593	jr = ir
594	DO WHILE ( t(jr-inc) > tmp_t )
595	t(jr) = t(jr-inc)
596	jr = jr - inc
597	IF ( jr <= inc ) EXIT
598	ENDDO
599	t(jr) = tmp_t
600	ENDDO
601	ENDDO
602
603	case4: DO t_index = 1, t_index_number
604
605	pos_x = pos_x_old + t(t_index) * ( prt_x - pos_x_old )
606	pos_y = pos_y_old + t(t_index) * ( prt_y - pos_y_old )
607	pos_z = pos_z_old + t(t_index) * ( prt_z - pos_z_old )
608
609	i3 = ( pos_x + 0.5 * dx ) * ddx
610	j3 = ( pos_y + 0.5 * dy ) * ddy
611	k3 = pos_z / dz + offset_ocean_nzt_m1
612
613	i5 = pos_x * ddx
614	j5 = pos_y * ddy
615	k5 = pos_z / dz + offset_ocean_nzt_m1
616
617	IF ( k3 <= nzb_s_inner(j3,i3) .AND. &
618	nzb_s_inner(j3,i3) /= 0 ) THEN
619
620	IF ( pos_z == nzb_s_inner(j3,i3) * dz .AND. &
621	k3 == nzb_s_inner(j3,i3) ) THEN
622	reflect_z = .TRUE.
623	EXIT case4
624	ENDIF
625
626	ENDIF
627
628	IF ( k5 <= nzb_s_inner(j3,i5) .AND. &
629	nzb_s_inner(j3,i5) /= 0 ) THEN
630
631	IF ( pos_z == nzb_s_inner(j3,i5) * dz .AND. &
632	k3 == nzb_s_inner(j3,i5) ) THEN
633	reflect_z = .TRUE.
634	EXIT case4
635	ENDIF
636
637	IF ( pos_x == ( i5 * dx + 0.5 * dx ) .AND. &
638	nzb_s_inner(j3,i5) /=0 .AND. &
639	pos_z < nzb_s_inner(j3,i5) * dz ) THEN
640	reflect_x = .TRUE.
641	EXIT case4
642	ENDIF
643
644	ENDIF
645
646	IF ( k5 <= nzb_s_inner(j5,i3) .AND. &
647	nzb_s_inner(j5,i3) /= 0 ) THEN
648
649	IF ( pos_z == nzb_s_inner(j5,i3) * dz .AND. &
650	k5 == nzb_s_inner(j5,i3) ) THEN
651	reflect_z = .TRUE.
652	EXIT case4
653	ENDIF
654
655	IF ( pos_y == ( j5 * dy + 0.5 * dy ) .AND. &
656	nzb_s_inner(j5,i3) /= 0 .AND. &
657	pos_z < nzb_s_inner(j5,i3) * dz ) THEN
658	reflect_y = .TRUE.
659	EXIT case4
660	ENDIF
661
662	ENDIF
663
664	ENDDO case4
665
666	ENDIF
667
668	ENDIF ! Check, if particle position is below the surface
669
670	!
671	!-- Do the respective reflection, in case that one of the above conditions
672	!-- is found to be true
673	IF ( reflect_z ) THEN
674
675	particles(n)%z = 2.0 * pos_z - prt_z
676	particles(n)%speed_z = - particles(n)%speed_z
677
678	IF ( use_sgs_for_particles ) THEN
679	particles(n)%rvar3 = - particles(n)%rvar3
680	ENDIF
681	reflect_z = .FALSE.
682
683	ELSEIF ( reflect_y ) THEN
684
685	particles(n)%y = 2.0 * pos_y - prt_y
686	particles(n)%speed_y = - particles(n)%speed_y
687
688	IF ( use_sgs_for_particles ) THEN
689	particles(n)%rvar2 = - particles(n)%rvar2
690	ENDIF
691	reflect_y = .FALSE.
692
693	ELSEIF ( reflect_x ) THEN
694
695	particles(n)%x = 2.0 * pos_x - prt_x
696	particles(n)%speed_x = - particles(n)%speed_x
697
698	IF ( use_sgs_for_particles ) THEN
699	particles(n)%rvar1 = - particles(n)%rvar1
700	ENDIF
701	reflect_x = .FALSE.
702
703	ENDIF
704
705	ENDDO
706
707	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' )
708
709	ENDIF
710
711	END SUBROUTINE lpm_boundary_conds

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