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source: palm/trunk/SOURCE/lpm_boundary_conds.f90 @ 872

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1	SUBROUTINE lpm_boundary_conds( range )
2
3	!------------------------------------------------------------------------------!
4	! Current revisions:
5	! -----------------
6	!
7	!
8	! Former revisions:
9	! -----------------
10	! $Id: lpm_boundary_conds.f90 850 2012-03-15 12:09:25Z franke $
11	!
12	! 849 2012-03-15 10:35:09Z raasch
13	! routine renamed lpm_boundary_conds, bottom and top boundary conditions
14	! included (former part of advec_particles)
15	!
16	! 824 2012-02-17 09:09:57Z raasch
17	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3
18	!
19	! 150 2008-02-29 08:19:58Z raasch
20	! Vertical index calculations adjusted for ocean runs.
21	!
22	! Initial version (2007/03/09)
23	!
24	! Description:
25	! ------------
26	! Boundary conditions for the Lagrangian particles.
27	! The routine consists of two different parts. One handles the bottom (flat)
28	! and top boundary. In this part, also particles which exceeded their lifetime
29	! are deleted.
30	! The other part handles the reflection of particles from vertical walls.
31	! This part was developed by Jin Zhang during 2006-2007.
32	!
33	! To do: Code structure for finding the t_index values and for checking the
34	! ----- reflection conditions is basically the same for all four cases, so it
35	! should be possible to further simplify/shorten it.
36	!
37	! THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!!
38	! (see offset_ocean_*)
39	!------------------------------------------------------------------------------!
40
41	USE arrays_3d
42	USE control_parameters
43	USE cpulog
44	USE grid_variables
45	USE indices
46	USE interfaces
47	USE particle_attributes
48	USE pegrid
49
50	IMPLICIT NONE
51
52	CHARACTER (LEN=*) :: range
53
54	INTEGER :: i, inc, ir, i1, i2, i3, i5, j, jr, j1, j2, j3, j5, k, k1, k2, &
55	k3, k5, n, nn, t_index, t_index_number
56
57	LOGICAL :: reflect_x, reflect_y, reflect_z
58
59	REAL :: dt_particle, pos_x, pos_x_old, pos_y, pos_y_old, pos_z, &
60	pos_z_old, prt_x, prt_y, prt_z, tmp_t, xline, yline, zline
61
62	REAL :: t(1:200)
63
64
65
66	IF ( range == 'bottom/top' ) THEN
67
68	!
69	!-- Apply boundary conditions to those particles that have crossed the top or
70	!-- bottom boundary and delete those particles, which are older than allowed
71	DO n = 1, number_of_particles
72
73	nn = particles(n)%tail_id
74
75	!
76	!-- Stop if particles have moved further than the length of one
77	!-- PE subdomain (newly released particles have age = age_m!)
78	IF ( particles(n)%age /= particles(n)%age_m ) THEN
79	IF ( ABS(particles(n)%speed_x) > &
80	((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. &
81	ABS(particles(n)%speed_y) > &
82	((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN
83
84	WRITE( message_string, * ) 'particle too fast. n = ', n
85	CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 )
86	ENDIF
87	ENDIF
88
89	IF ( particles(n)%age > particle_maximum_age .AND. &
90	particle_mask(n) ) &
91	THEN
92	particle_mask(n) = .FALSE.
93	deleted_particles = deleted_particles + 1
94	IF ( use_particle_tails .AND. nn /= 0 ) THEN
95	tail_mask(nn) = .FALSE.
96	deleted_tails = deleted_tails + 1
97	ENDIF
98	ENDIF
99
100	IF ( particles(n)%z >= zu(nz) .AND. particle_mask(n) ) THEN
101	IF ( ibc_par_t == 1 ) THEN
102	!
103	!-- Particle absorption
104	particle_mask(n) = .FALSE.
105	deleted_particles = deleted_particles + 1
106	IF ( use_particle_tails .AND. nn /= 0 ) THEN
107	tail_mask(nn) = .FALSE.
108	deleted_tails = deleted_tails + 1
109	ENDIF
110	ELSEIF ( ibc_par_t == 2 ) THEN
111	!
112	!-- Particle reflection
113	particles(n)%z = 2.0 * zu(nz) - particles(n)%z
114	particles(n)%speed_z = -particles(n)%speed_z
115	IF ( use_sgs_for_particles .AND. &
116	particles(n)%rvar3 > 0.0 ) THEN
117	particles(n)%rvar3 = -particles(n)%rvar3
118	ENDIF
119	IF ( use_particle_tails .AND. nn /= 0 ) THEN
120	particle_tail_coordinates(1,3,nn) = 2.0 * zu(nz) - &
121	particle_tail_coordinates(1,3,nn)
122	ENDIF
123	ENDIF
124	ENDIF
125	IF ( particles(n)%z < zw(0) .AND. particle_mask(n) ) THEN
126	IF ( ibc_par_b == 1 ) THEN
127	!
128	!-- Particle absorption
129	particle_mask(n) = .FALSE.
130	deleted_particles = deleted_particles + 1
131	IF ( use_particle_tails .AND. nn /= 0 ) THEN
132	tail_mask(nn) = .FALSE.
133	deleted_tails = deleted_tails + 1
134	ENDIF
135	ELSEIF ( ibc_par_b == 2 ) THEN
136	!
137	!-- Particle reflection
138	particles(n)%z = 2.0 * zw(0) - particles(n)%z
139	particles(n)%speed_z = -particles(n)%speed_z
140	IF ( use_sgs_for_particles .AND. &
141	particles(n)%rvar3 < 0.0 ) THEN
142	particles(n)%rvar3 = -particles(n)%rvar3
143	ENDIF
144	IF ( use_particle_tails .AND. nn /= 0 ) THEN
145	particle_tail_coordinates(1,3,nn) = 2.0 * zu(nz) - &
146	particle_tail_coordinates(1,3,nn)
147	ENDIF
148	IF ( use_particle_tails .AND. nn /= 0 ) THEN
149	particle_tail_coordinates(1,3,nn) = 2.0 * zw(0) - &
150	particle_tail_coordinates(1,3,nn)
151	ENDIF
152	ENDIF
153	ENDIF
154	ENDDO
155
156	ELSEIF ( range == 'walls' ) THEN
157
158	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' )
159
160	reflect_x = .FALSE.
161	reflect_y = .FALSE.
162	reflect_z = .FALSE.
163
164	DO n = 1, number_of_particles
165
166	dt_particle = particles(n)%age - particles(n)%age_m
167
168	i2 = ( particles(n)%x + 0.5 * dx ) * ddx
169	j2 = ( particles(n)%y + 0.5 * dy ) * ddy
170	k2 = particles(n)%z / dz + 1 + offset_ocean_nzt_m1
171
172	prt_x = particles(n)%x
173	prt_y = particles(n)%y
174	prt_z = particles(n)%z
175
176	!
177	!-- If the particle position is below the surface, it has to be reflected
178	IF ( k2 <= nzb_s_inner(j2,i2) .AND. nzb_s_inner(j2,i2) /=0 ) THEN
179
180	pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle
181	pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle
182	pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle
183	i1 = ( pos_x_old + 0.5 * dx ) * ddx
184	j1 = ( pos_y_old + 0.5 * dy ) * ddy
185	k1 = pos_z_old / dz + offset_ocean_nzt_m1
186
187	!
188	!-- Case 1
189	IF ( particles(n)%x > pos_x_old .AND. particles(n)%y > pos_y_old )&
190	THEN
191	t_index = 1
192
193	DO i = i1, i2
194	xline = i * dx + 0.5 * dx
195	t(t_index) = ( xline - pos_x_old ) / &
196	( particles(n)%x - pos_x_old )
197	t_index = t_index + 1
198	ENDDO
199
200	DO j = j1, j2
201	yline = j * dy + 0.5 * dy
202	t(t_index) = ( yline - pos_y_old ) / &
203	( particles(n)%y - pos_y_old )
204	t_index = t_index + 1
205	ENDDO
206
207	IF ( particles(n)%z < pos_z_old ) THEN
208	DO k = k1, k2 , -1
209	zline = k * dz
210	t(t_index) = ( pos_z_old - zline ) / &
211	( pos_z_old - particles(n)%z )
212	t_index = t_index + 1
213	ENDDO
214	ENDIF
215
216	t_index_number = t_index - 1
217
218	!
219	!-- Sorting t
220	inc = 1
221	jr = 1
222	DO WHILE ( inc <= t_index_number )
223	inc = 3 * inc + 1
224	ENDDO
225
226	DO WHILE ( inc > 1 )
227	inc = inc / 3
228	DO ir = inc+1, t_index_number
229	tmp_t = t(ir)
230	jr = ir
231	DO WHILE ( t(jr-inc) > tmp_t )
232	t(jr) = t(jr-inc)
233	jr = jr - inc
234	IF ( jr <= inc ) EXIT
235	ENDDO
236	t(jr) = tmp_t
237	ENDDO
238	ENDDO
239
240	case1: DO t_index = 1, t_index_number
241
242	pos_x = pos_x_old + t(t_index) * ( prt_x - pos_x_old )
243	pos_y = pos_y_old + t(t_index) * ( prt_y - pos_y_old )
244	pos_z = pos_z_old + t(t_index) * ( prt_z - pos_z_old )
245
246	i3 = ( pos_x + 0.5 * dx ) * ddx
247	j3 = ( pos_y + 0.5 * dy ) * ddy
248	k3 = pos_z / dz + offset_ocean_nzt_m1
249
250	i5 = pos_x * ddx
251	j5 = pos_y * ddy
252	k5 = pos_z / dz + offset_ocean_nzt_m1
253
254	IF ( k5 <= nzb_s_inner(j5,i3) .AND. &
255	nzb_s_inner(j5,i3) /= 0 ) THEN
256
257	IF ( pos_z == nzb_s_inner(j5,i3) * dz .AND. &
258	k3 == nzb_s_inner(j5,i3) ) THEN
259	reflect_z = .TRUE.
260	EXIT case1
261	ENDIF
262
263	ENDIF
264
265	IF ( k5 <= nzb_s_inner(j3,i5) .AND. &
266	nzb_s_inner(j3,i5) /= 0 ) THEN
267
268	IF ( pos_z == nzb_s_inner(j3,i5) * dz .AND. &
269	k3 == nzb_s_inner(j3,i5) ) THEN
270	reflect_z = .TRUE.
271	EXIT case1
272	ENDIF
273
274	ENDIF
275
276	IF ( k3 <= nzb_s_inner(j3,i3) .AND. &
277	nzb_s_inner(j3,i3) /= 0 ) THEN
278
279	IF ( pos_z == nzb_s_inner(j3,i3) * dz .AND. &
280	k3 == nzb_s_inner(j3,i3) ) THEN
281	reflect_z = .TRUE.
282	EXIT case1
283	ENDIF
284
285	IF ( pos_y == ( j3 * dy - 0.5 * dy ) .AND. &
286	pos_z < nzb_s_inner(j3,i3) * dz ) THEN
287	reflect_y = .TRUE.
288	EXIT case1
289	ENDIF
290
291	IF ( pos_x == ( i3 * dx - 0.5 * dx ) .AND. &
292	pos_z < nzb_s_inner(j3,i3) * dz ) THEN
293	reflect_x = .TRUE.
294	EXIT case1
295	ENDIF
296
297	ENDIF
298
299	ENDDO case1
300
301	!
302	!-- Case 2
303	ELSEIF ( particles(n)%x > pos_x_old .AND. &
304	particles(n)%y < pos_y_old ) THEN
305
306	t_index = 1
307
308	DO i = i1, i2
309	xline = i * dx + 0.5 * dx
310	t(t_index) = ( xline - pos_x_old ) / &
311	( particles(n)%x - pos_x_old )
312	t_index = t_index + 1
313	ENDDO
314
315	DO j = j1, j2, -1
316	yline = j * dy - 0.5 * dy
317	t(t_index) = ( pos_y_old - yline ) / &
318	( pos_y_old - particles(n)%y )
319	t_index = t_index + 1
320	ENDDO
321
322	IF ( particles(n)%z < pos_z_old ) THEN
323	DO k = k1, k2 , -1
324	zline = k * dz
325	t(t_index) = ( pos_z_old - zline ) / &
326	( pos_z_old - particles(n)%z )
327	t_index = t_index + 1
328	ENDDO
329	ENDIF
330	t_index_number = t_index-1
331
332	!
333	!-- Sorting t
334	inc = 1
335	jr = 1
336	DO WHILE ( inc <= t_index_number )
337	inc = 3 * inc + 1
338	ENDDO
339
340	DO WHILE ( inc > 1 )
341	inc = inc / 3
342	DO ir = inc+1, t_index_number
343	tmp_t = t(ir)
344	jr = ir
345	DO WHILE ( t(jr-inc) > tmp_t )
346	t(jr) = t(jr-inc)
347	jr = jr - inc
348	IF ( jr <= inc ) EXIT
349	ENDDO
350	t(jr) = tmp_t
351	ENDDO
352	ENDDO
353
354	case2: DO t_index = 1, t_index_number
355
356	pos_x = pos_x_old + t(t_index) * ( prt_x - pos_x_old )
357	pos_y = pos_y_old + t(t_index) * ( prt_y - pos_y_old )
358	pos_z = pos_z_old + t(t_index) * ( prt_z - pos_z_old )
359
360	i3 = ( pos_x + 0.5 * dx ) * ddx
361	j3 = ( pos_y + 0.5 * dy ) * ddy
362	k3 = pos_z / dz + offset_ocean_nzt_m1
363
364	i5 = pos_x * ddx
365	j5 = pos_y * ddy
366	k5 = pos_z / dz + offset_ocean_nzt_m1
367
368	IF ( k5 <= nzb_s_inner(j3,i5) .AND. &
369	nzb_s_inner(j3,i5) /= 0 ) THEN
370
371	IF ( pos_z == nzb_s_inner(j3,i5) * dz .AND. &
372	k3 == nzb_s_inner(j3,i5) ) THEN
373	reflect_z = .TRUE.
374	EXIT case2
375	ENDIF
376
377	ENDIF
378
379	IF ( k3 <= nzb_s_inner(j3,i3) .AND. &
380	nzb_s_inner(j3,i3) /= 0 ) THEN
381
382	IF ( pos_z == nzb_s_inner(j3,i3) * dz .AND. &
383	k3 == nzb_s_inner(j3,i3) ) THEN
384	reflect_z = .TRUE.
385	EXIT case2
386	ENDIF
387
388	IF ( pos_x == ( i3 * dx - 0.5 * dx ) .AND. &
389	pos_z < nzb_s_inner(j3,i3) * dz ) THEN
390	reflect_x = .TRUE.
391	EXIT case2
392	ENDIF
393
394	ENDIF
395
396	IF ( k5 <= nzb_s_inner(j5,i3) .AND. &
397	nzb_s_inner(j5,i3) /= 0 ) THEN
398
399	IF ( pos_z == nzb_s_inner(j5,i3) * dz .AND. &
400	k3 == nzb_s_inner(j5,i3) ) THEN
401	reflect_z = .TRUE.
402	EXIT case2
403	ENDIF
404
405	IF ( pos_y == ( j5 * dy + 0.5 * dy ) .AND. &
406	pos_z < nzb_s_inner(j5,i3) * dz ) THEN
407	reflect_y = .TRUE.
408	EXIT case2
409	ENDIF
410
411	ENDIF
412
413	ENDDO case2
414
415	!
416	!-- Case 3
417	ELSEIF ( particles(n)%x < pos_x_old .AND. &
418	particles(n)%y > pos_y_old ) THEN
419
420	t_index = 1
421
422	DO i = i1, i2, -1
423	xline = i * dx - 0.5 * dx
424	t(t_index) = ( pos_x_old - xline ) / &
425	( pos_x_old - particles(n)%x )
426	t_index = t_index + 1
427	ENDDO
428
429	DO j = j1, j2
430	yline = j * dy + 0.5 * dy
431	t(t_index) = ( yline - pos_y_old ) / &
432	( particles(n)%y - pos_y_old )
433	t_index = t_index + 1
434	ENDDO
435
436	IF ( particles(n)%z < pos_z_old ) THEN
437	DO k = k1, k2 , -1
438	zline = k * dz
439	t(t_index) = ( pos_z_old - zline ) / &
440	( pos_z_old - particles(n)%z )
441	t_index = t_index + 1
442	ENDDO
443	ENDIF
444	t_index_number = t_index - 1
445
446	!
447	!-- Sorting t
448	inc = 1
449	jr = 1
450
451	DO WHILE ( inc <= t_index_number )
452	inc = 3 * inc + 1
453	ENDDO
454
455	DO WHILE ( inc > 1 )
456	inc = inc / 3
457	DO ir = inc+1, t_index_number
458	tmp_t = t(ir)
459	jr = ir
460	DO WHILE ( t(jr-inc) > tmp_t )
461	t(jr) = t(jr-inc)
462	jr = jr - inc
463	IF ( jr <= inc ) EXIT
464	ENDDO
465	t(jr) = tmp_t
466	ENDDO
467	ENDDO
468
469	case3: DO t_index = 1, t_index_number
470
471	pos_x = pos_x_old + t(t_index) * ( prt_x - pos_x_old )
472	pos_y = pos_y_old + t(t_index) * ( prt_y - pos_y_old )
473	pos_z = pos_z_old + t(t_index) * ( prt_z - pos_z_old )
474
475	i3 = ( pos_x + 0.5 * dx ) * ddx
476	j3 = ( pos_y + 0.5 * dy ) * ddy
477	k3 = pos_z / dz + offset_ocean_nzt_m1
478
479	i5 = pos_x * ddx
480	j5 = pos_y * ddy
481	k5 = pos_z / dz + offset_ocean_nzt_m1
482
483	IF ( k5 <= nzb_s_inner(j5,i3) .AND. &
484	nzb_s_inner(j5,i3) /= 0 ) THEN
485
486	IF ( pos_z == nzb_s_inner(j5,i3) * dz .AND. &
487	k3 == nzb_s_inner(j5,i3) ) THEN
488	reflect_z = .TRUE.
489	EXIT case3
490	ENDIF
491
492	ENDIF
493
494	IF ( k3 <= nzb_s_inner(j3,i3) .AND. &
495	nzb_s_inner(j3,i3) /= 0 ) THEN
496
497	IF ( pos_z == nzb_s_inner(j3,i3) * dz .AND. &
498	k3 == nzb_s_inner(j3,i3) ) THEN
499	reflect_z = .TRUE.
500	EXIT case3
501	ENDIF
502
503	IF ( pos_y == ( j3 * dy - 0.5 * dy ) .AND. &
504	pos_z < nzb_s_inner(j3,i3) * dz ) THEN
505	reflect_y = .TRUE.
506	EXIT case3
507	ENDIF
508
509	ENDIF
510
511	IF ( k5 <= nzb_s_inner(j3,i5) .AND. &
512	nzb_s_inner(j3,i5) /= 0 ) THEN
513
514	IF ( pos_z == nzb_s_inner(j3,i5) * dz .AND. &
515	k3 == nzb_s_inner(j3,i5) ) THEN
516	reflect_z = .TRUE.
517	EXIT case3
518	ENDIF
519
520	IF ( pos_x == ( i5 * dx + 0.5 * dx ) .AND. &
521	pos_z < nzb_s_inner(j3,i5) * dz ) THEN
522	reflect_x = .TRUE.
523	EXIT case3
524	ENDIF
525
526	ENDIF
527
528	ENDDO case3
529
530	!
531	!-- Case 4
532	ELSEIF ( particles(n)%x < pos_x_old .AND. &
533	particles(n)%y < pos_y_old ) THEN
534
535	t_index = 1
536
537	DO i = i1, i2, -1
538	xline = i * dx - 0.5 * dx
539	t(t_index) = ( pos_x_old - xline ) / &
540	( pos_x_old - particles(n)%x )
541	t_index = t_index + 1
542	ENDDO
543
544	DO j = j1, j2, -1
545	yline = j * dy - 0.5 * dy
546	t(t_index) = ( pos_y_old - yline ) / &
547	( pos_y_old - particles(n)%y )
548	t_index = t_index + 1
549	ENDDO
550
551	IF ( particles(n)%z < pos_z_old ) THEN
552	DO k = k1, k2 , -1
553	zline = k * dz
554	t(t_index) = ( pos_z_old - zline ) / &
555	( pos_z_old-particles(n)%z )
556	t_index = t_index + 1
557	ENDDO
558	ENDIF
559	t_index_number = t_index-1
560
561	!
562	!-- Sorting t
563	inc = 1
564	jr = 1
565
566	DO WHILE ( inc <= t_index_number )
567	inc = 3 * inc + 1
568	ENDDO
569
570	DO WHILE ( inc > 1 )
571	inc = inc / 3
572	DO ir = inc+1, t_index_number
573	tmp_t = t(ir)
574	jr = ir
575	DO WHILE ( t(jr-inc) > tmp_t )
576	t(jr) = t(jr-inc)
577	jr = jr - inc
578	IF ( jr <= inc ) EXIT
579	ENDDO
580	t(jr) = tmp_t
581	ENDDO
582	ENDDO
583
584	case4: DO t_index = 1, t_index_number
585
586	pos_x = pos_x_old + t(t_index) * ( prt_x - pos_x_old )
587	pos_y = pos_y_old + t(t_index) * ( prt_y - pos_y_old )
588	pos_z = pos_z_old + t(t_index) * ( prt_z - pos_z_old )
589
590	i3 = ( pos_x + 0.5 * dx ) * ddx
591	j3 = ( pos_y + 0.5 * dy ) * ddy
592	k3 = pos_z / dz + offset_ocean_nzt_m1
593
594	i5 = pos_x * ddx
595	j5 = pos_y * ddy
596	k5 = pos_z / dz + offset_ocean_nzt_m1
597
598	IF ( k3 <= nzb_s_inner(j3,i3) .AND. &
599	nzb_s_inner(j3,i3) /= 0 ) THEN
600
601	IF ( pos_z == nzb_s_inner(j3,i3) * dz .AND. &
602	k3 == nzb_s_inner(j3,i3) ) THEN
603	reflect_z = .TRUE.
604	EXIT case4
605	ENDIF
606
607	ENDIF
608
609	IF ( k5 <= nzb_s_inner(j3,i5) .AND. &
610	nzb_s_inner(j3,i5) /= 0 ) THEN
611
612	IF ( pos_z == nzb_s_inner(j3,i5) * dz .AND. &
613	k3 == nzb_s_inner(j3,i5) ) THEN
614	reflect_z = .TRUE.
615	EXIT case4
616	ENDIF
617
618	IF ( pos_x == ( i5 * dx + 0.5 * dx ) .AND. &
619	nzb_s_inner(j3,i5) /=0 .AND. &
620	pos_z < nzb_s_inner(j3,i5) * dz ) THEN
621	reflect_x = .TRUE.
622	EXIT case4
623	ENDIF
624
625	ENDIF
626
627	IF ( k5 <= nzb_s_inner(j5,i3) .AND. &
628	nzb_s_inner(j5,i3) /= 0 ) THEN
629
630	IF ( pos_z == nzb_s_inner(j5,i3) * dz .AND. &
631	k5 == nzb_s_inner(j5,i3) ) THEN
632	reflect_z = .TRUE.
633	EXIT case4
634	ENDIF
635
636	IF ( pos_y == ( j5 * dy + 0.5 * dy ) .AND. &
637	nzb_s_inner(j5,i3) /= 0 .AND. &
638	pos_z < nzb_s_inner(j5,i3) * dz ) THEN
639	reflect_y = .TRUE.
640	EXIT case4
641	ENDIF
642
643	ENDIF
644
645	ENDDO case4
646
647	ENDIF
648
649	ENDIF ! Check, if particle position is below the surface
650
651	!
652	!-- Do the respective reflection, in case that one of the above conditions
653	!-- is found to be true
654	IF ( reflect_z ) THEN
655
656	particles(n)%z = 2.0 * pos_z - prt_z
657	particles(n)%speed_z = - particles(n)%speed_z
658
659	IF ( use_sgs_for_particles ) THEN
660	particles(n)%rvar3 = - particles(n)%rvar3
661	ENDIF
662	reflect_z = .FALSE.
663
664	ELSEIF ( reflect_y ) THEN
665
666	particles(n)%y = 2.0 * pos_y - prt_y
667	particles(n)%speed_y = - particles(n)%speed_y
668
669	IF ( use_sgs_for_particles ) THEN
670	particles(n)%rvar2 = - particles(n)%rvar2
671	ENDIF
672	reflect_y = .FALSE.
673
674	ELSEIF ( reflect_x ) THEN
675
676	particles(n)%x = 2.0 * pos_x - prt_x
677	particles(n)%speed_x = - particles(n)%speed_x
678
679	IF ( use_sgs_for_particles ) THEN
680	particles(n)%rvar1 = - particles(n)%rvar1
681	ENDIF
682	reflect_x = .FALSE.
683
684	ENDIF
685
686	ENDDO
687
688	CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' )
689
690	ENDIF
691
692	END SUBROUTINE lpm_boundary_conds

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