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source: palm/trunk/SOURCE/diffusion_e.f90 @ 1373

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1	MODULE diffusion_e_mod
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 1997-2014 Leibniz Universitaet Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: diffusion_e.f90 1341 2014-03-25 19:48:09Z raasch $
27	!
28	! 1340 2014-03-25 19:45:13Z kanani
29	! REAL constants defined as wp-kind
30	!
31	! 1320 2014-03-20 08:40:49Z raasch
32	! ONLY-attribute added to USE-statements,
33	! kind-parameters added to all INTEGER and REAL declaration statements,
34	! kinds are defined in new module kinds,
35	! revision history before 2012 removed,
36	! comment fields (!:) to be used for variable explanations added to
37	! all variable declaration statements
38	!
39	! 1257 2013-11-08 15:18:40Z raasch
40	! openacc loop and loop vector clauses removed
41	!
42	! 1179 2013-06-14 05:57:58Z raasch
43	! use_reference renamed use_single_reference_value
44	!
45	! 1171 2013-05-30 11:27:45Z raasch
46	! use_reference-case activated in accelerator version
47	!
48	! 1128 2013-04-12 06:19:32Z raasch
49	! loop index bounds in accelerator version replaced by i_left, i_right, j_south,
50	! j_north
51	!
52	! 1065 2012-11-22 17:42:36Z hoffmann
53	! Enabled the claculation of diss in case of turbulence = .TRUE. (parameterized
54	! effects of turbulence on autoconversion and accretion in two-moments cloud
55	! physics scheme).
56	!
57	! 1036 2012-10-22 13:43:42Z raasch
58	! code put under GPL (PALM 3.9)
59	!
60	! 1015 2012-09-27 09:23:24Z raasch
61	! accelerator version (*_acc) added,
62	! adjustment of mixing length to the Prandtl mixing length at first grid point
63	! above ground removed
64	!
65	! 1010 2012-09-20 07:59:54Z raasch
66	! cpp switch __nopointer added for pointer free version
67	!
68	! 1001 2012-09-13 14:08:46Z raasch
69	! most arrays comunicated by module instead of parameter list
70	!
71	! 825 2012-02-19 03:03:44Z raasch
72	! wang_collision_kernel renamed wang_kernel
73	!
74	! Revision 1.1 1997/09/19 07:40:24 raasch
75	! Initial revision
76	!
77	!
78	! Description:
79	! ------------
80	! Diffusion- and dissipation terms for the TKE
81	!------------------------------------------------------------------------------!
82
83	PRIVATE
84	PUBLIC diffusion_e, diffusion_e_acc
85
86
87	INTERFACE diffusion_e
88	MODULE PROCEDURE diffusion_e
89	MODULE PROCEDURE diffusion_e_ij
90	END INTERFACE diffusion_e
91
92	INTERFACE diffusion_e_acc
93	MODULE PROCEDURE diffusion_e_acc
94	END INTERFACE diffusion_e_acc
95
96	CONTAINS
97
98
99	!------------------------------------------------------------------------------!
100	! Call for all grid points
101	!------------------------------------------------------------------------------!
102	SUBROUTINE diffusion_e( var, var_reference )
103
104	USE arrays_3d, &
105	ONLY: dd2zu, ddzu, ddzw, diss, e, km, l_grid, tend, zu, zw
106
107	USE control_parameters, &
108	ONLY: atmos_ocean_sign, g, turbulence, use_single_reference_value, &
109	wall_adjustment, wall_adjustment_factor
110
111	USE grid_variables, &
112	ONLY: ddx2, ddy2
113
114	USE indices, &
115	ONLY: nxl, nxr, nyn, nys, nzb, nzb_s_inner, nzt
116
117	USE kinds
118
119	USE particle_attributes, &
120	ONLY: use_sgs_for_particles, wang_kernel
121
122	IMPLICIT NONE
123
124	INTEGER(iwp) :: i !:
125	INTEGER(iwp) :: j !:
126	INTEGER(iwp) :: k !:
127	REAL(wp) :: dvar_dz !:
128	REAL(wp) :: l_stable !:
129	REAL(wp) :: var_reference !:
130
131	#if defined( __nopointer )
132	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !:
133	#else
134	REAL(wp), DIMENSION(:,:,:), POINTER :: var !:
135	#endif
136	REAL(wp), DIMENSION(nzb+1:nzt,nys:nyn) :: dissipation !:
137	REAL(wp), DIMENSION(nzb+1:nzt,nys:nyn) :: l !:
138	REAL(wp), DIMENSION(nzb+1:nzt,nys:nyn) :: ll !:
139
140
141	!
142	!-- This if clause must be outside the k-loop because otherwise
143	!-- runtime errors occur with -C hopt on NEC
144	IF ( use_single_reference_value ) THEN
145
146	DO i = nxl, nxr
147	DO j = nys, nyn
148	DO k = nzb_s_inner(j,i)+1, nzt
149	!
150	!-- Calculate the mixing length (for dissipation)
151	dvar_dz = atmos_ocean_sign * &
152	( var(k+1,j,i) - var(k-1,j,i) ) * dd2zu(k)
153	IF ( dvar_dz > 0.0_wp ) THEN
154	l_stable = 0.76_wp * SQRT( e(k,j,i) ) / &
155	SQRT( g / var_reference * dvar_dz ) + 1E-5_wp
156	ELSE
157	l_stable = l_grid(k)
158	ENDIF
159	!
160	!-- Adjustment of the mixing length
161	IF ( wall_adjustment ) THEN
162	l(k,j) = MIN( wall_adjustment_factor * &
163	( zu(k) - zw(nzb_s_inner(j,i)) ), &
164	l_grid(k), l_stable )
165	ll(k,j) = MIN( wall_adjustment_factor * &
166	( zu(k) - zw(nzb_s_inner(j,i)) ), &
167	l_grid(k) )
168	ELSE
169	l(k,j) = MIN( l_grid(k), l_stable )
170	ll(k,j) = l_grid(k)
171	ENDIF
172
173	ENDDO
174	ENDDO
175
176	!
177	!-- Calculate the tendency terms
178	DO j = nys, nyn
179	DO k = nzb_s_inner(j,i)+1, nzt
180
181	dissipation(k,j) = ( 0.19_wp + 0.74_wp * l(k,j) / ll(k,j) ) * &
182	e(k,j,i) * SQRT( e(k,j,i) ) / l(k,j)
183
184	tend(k,j,i) = tend(k,j,i) &
185	+ ( &
186	( km(k,j,i)+km(k,j,i+1) ) * ( e(k,j,i+1)-e(k,j,i) ) &
187	- ( km(k,j,i)+km(k,j,i-1) ) * ( e(k,j,i)-e(k,j,i-1) ) &
188	) * ddx2 &
189	+ ( &
190	( km(k,j,i)+km(k,j+1,i) ) * ( e(k,j+1,i)-e(k,j,i) ) &
191	- ( km(k,j,i)+km(k,j-1,i) ) * ( e(k,j,i)-e(k,j-1,i) ) &
192	) * ddy2 &
193	+ ( &
194	( km(k,j,i)+km(k+1,j,i) ) * ( e(k+1,j,i)-e(k,j,i) ) * ddzu(k+1) &
195	- ( km(k,j,i)+km(k-1,j,i) ) * ( e(k,j,i)-e(k-1,j,i) ) * ddzu(k) &
196	) * ddzw(k) &
197	- dissipation(k,j)
198
199	ENDDO
200	ENDDO
201
202	!
203	!-- Store dissipation if needed for calculating the sgs particle
204	!-- velocities
205	IF ( use_sgs_for_particles .OR. wang_kernel .OR. &
206	turbulence ) THEN
207	DO j = nys, nyn
208	DO k = nzb_s_inner(j,i)+1, nzt
209	diss(k,j,i) = dissipation(k,j)
210	ENDDO
211	ENDDO
212	ENDIF
213
214	ENDDO
215
216	ELSE
217
218	DO i = nxl, nxr
219	DO j = nys, nyn
220	DO k = nzb_s_inner(j,i)+1, nzt
221	!
222	!-- Calculate the mixing length (for dissipation)
223	dvar_dz = atmos_ocean_sign * &
224	( var(k+1,j,i) - var(k-1,j,i) ) * dd2zu(k)
225	IF ( dvar_dz > 0.0_wp ) THEN
226	l_stable = 0.76_wp * SQRT( e(k,j,i) ) / &
227	SQRT( g / var(k,j,i) * dvar_dz ) + 1E-5_wp
228	ELSE
229	l_stable = l_grid(k)
230	ENDIF
231	!
232	!-- Adjustment of the mixing length
233	IF ( wall_adjustment ) THEN
234	l(k,j) = MIN( wall_adjustment_factor * &
235	( zu(k) - zw(nzb_s_inner(j,i)) ), &
236	l_grid(k), l_stable )
237	ll(k,j) = MIN( wall_adjustment_factor * &
238	( zu(k) - zw(nzb_s_inner(j,i)) ), &
239	l_grid(k) )
240	ELSE
241	l(k,j) = MIN( l_grid(k), l_stable )
242	ll(k,j) = l_grid(k)
243	ENDIF
244
245	ENDDO
246	ENDDO
247
248	!
249	!-- Calculate the tendency terms
250	DO j = nys, nyn
251	DO k = nzb_s_inner(j,i)+1, nzt
252
253	dissipation(k,j) = ( 0.19_wp + 0.74_wp * l(k,j) / ll(k,j) ) * &
254	e(k,j,i) * SQRT( e(k,j,i) ) / l(k,j)
255
256	tend(k,j,i) = tend(k,j,i) &
257	+ ( &
258	( km(k,j,i)+km(k,j,i+1) ) * ( e(k,j,i+1)-e(k,j,i) ) &
259	- ( km(k,j,i)+km(k,j,i-1) ) * ( e(k,j,i)-e(k,j,i-1) ) &
260	) * ddx2 &
261	+ ( &
262	( km(k,j,i)+km(k,j+1,i) ) * ( e(k,j+1,i)-e(k,j,i) ) &
263	- ( km(k,j,i)+km(k,j-1,i) ) * ( e(k,j,i)-e(k,j-1,i) ) &
264	) * ddy2 &
265	+ ( &
266	( km(k,j,i)+km(k+1,j,i) ) * ( e(k+1,j,i)-e(k,j,i) ) * ddzu(k+1) &
267	- ( km(k,j,i)+km(k-1,j,i) ) * ( e(k,j,i)-e(k-1,j,i) ) * ddzu(k) &
268	) * ddzw(k) &
269	- dissipation(k,j)
270
271	ENDDO
272	ENDDO
273
274	!
275	!-- Store dissipation if needed for calculating the sgs particle
276	!-- velocities
277	IF ( use_sgs_for_particles .OR. wang_kernel .OR. &
278	turbulence ) THEN
279	DO j = nys, nyn
280	DO k = nzb_s_inner(j,i)+1, nzt
281	diss(k,j,i) = dissipation(k,j)
282	ENDDO
283	ENDDO
284	ENDIF
285
286	ENDDO
287
288	ENDIF
289
290	!
291	!-- Boundary condition for dissipation
292	IF ( use_sgs_for_particles .OR. wang_kernel .OR. turbulence ) THEN
293	DO i = nxl, nxr
294	DO j = nys, nyn
295	diss(nzb_s_inner(j,i),j,i) = diss(nzb_s_inner(j,i)+1,j,i)
296	ENDDO
297	ENDDO
298	ENDIF
299
300	END SUBROUTINE diffusion_e
301
302
303	!------------------------------------------------------------------------------!
304	! Call for all grid points - accelerator version
305	!------------------------------------------------------------------------------!
306	SUBROUTINE diffusion_e_acc( var, var_reference )
307
308	USE arrays_3d, &
309	ONLY: dd2zu, ddzu, ddzw, diss, e, km, l_grid, tend, zu, zw
310
311	USE control_parameters, &
312	ONLY: atmos_ocean_sign, g, turbulence, use_single_reference_value, &
313	wall_adjustment, wall_adjustment_factor
314
315	USE grid_variables, &
316	ONLY: ddx2, ddy2
317
318	USE indices, &
319	ONLY: i_left, i_right, j_north, j_south, nzb_s_inner, nzt
320
321	USE kinds
322
323	USE particle_attributes, &
324	ONLY: use_sgs_for_particles, wang_kernel
325
326	IMPLICIT NONE
327
328	INTEGER(iwp) :: i !:
329	INTEGER(iwp) :: j !:
330	INTEGER(iwp) :: k !:
331	REAL(wp) :: dissipation !:
332	REAL(wp) :: dvar_dz !:
333	REAL(wp) :: l !:
334	REAL(wp) :: ll !:
335	REAL(wp) :: l_stable !:
336	REAL(wp) :: var_reference !:
337
338	#if defined( __nopointer )
339	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !:
340	#else
341	REAL(wp), DIMENSION(:,:,:), POINTER :: var !:
342	#endif
343
344
345	!
346	!-- This if clause must be outside the k-loop because otherwise
347	!-- runtime errors occur with -C hopt on NEC
348	IF ( use_single_reference_value ) THEN
349
350	!$acc kernels present( ddzu, ddzw, dd2zu, diss, e, km, l_grid ) &
351	!$acc present( nzb_s_inner, rif, tend, var, zu, zw )
352	DO i = i_left, i_right
353	DO j = j_south, j_north
354	DO k = 1, nzt
355
356	IF ( k > nzb_s_inner(j,i) ) THEN
357	!
358	!-- Calculate the mixing length (for dissipation)
359	dvar_dz = atmos_ocean_sign * &
360	( var(k+1,j,i) - var(k-1,j,i) ) * dd2zu(k)
361	IF ( dvar_dz > 0.0_wp ) THEN
362	l_stable = 0.76_wp * SQRT( e(k,j,i) ) / &
363	SQRT( g / var_reference * dvar_dz ) + 1E-5_wp
364	ELSE
365	l_stable = l_grid(k)
366	ENDIF
367	!
368	!-- Adjustment of the mixing length
369	IF ( wall_adjustment ) THEN
370	l = MIN( wall_adjustment_factor * &
371	( zu(k) - zw(nzb_s_inner(j,i)) ), &
372	l_grid(k), l_stable )
373	ll = MIN( wall_adjustment_factor * &
374	( zu(k) - zw(nzb_s_inner(j,i)) ), &
375	l_grid(k) )
376	ELSE
377	l = MIN( l_grid(k), l_stable )
378	ll = l_grid(k)
379	ENDIF
380	!
381	!-- Calculate the tendency terms
382	dissipation = ( 0.19_wp + 0.74_wp * l / ll ) * &
383	e(k,j,i) * SQRT( e(k,j,i) ) / l
384
385	tend(k,j,i) = tend(k,j,i) &
386	+ ( &
387	( km(k,j,i)+km(k,j,i+1) ) * ( e(k,j,i+1)-e(k,j,i) ) &
388	- ( km(k,j,i)+km(k,j,i-1) ) * ( e(k,j,i)-e(k,j,i-1) ) &
389	) * ddx2 &
390	+ ( &
391	( km(k,j,i)+km(k,j+1,i) ) * ( e(k,j+1,i)-e(k,j,i) ) &
392	- ( km(k,j,i)+km(k,j-1,i) ) * ( e(k,j,i)-e(k,j-1,i) ) &
393	) * ddy2 &
394	+ ( &
395	( km(k,j,i)+km(k+1,j,i) ) * ( e(k+1,j,i)-e(k,j,i) ) * ddzu(k+1) &
396	- ( km(k,j,i)+km(k-1,j,i) ) * ( e(k,j,i)-e(k-1,j,i) ) * ddzu(k) &
397	) * ddzw(k) &
398	- dissipation
399
400	!
401	!-- Store dissipation if needed for calculating the sgs particle
402	!-- velocities
403	IF ( use_sgs_for_particles .OR. wang_kernel .OR. &
404	turbulence ) THEN
405	diss(k,j,i) = dissipation
406	ENDIF
407
408	ENDIF
409
410	ENDDO
411	ENDDO
412	ENDDO
413	!$acc end kernels
414
415	ELSE
416
417	!$acc kernels present( ddzu, ddzw, dd2zu, diss, e, km, l_grid ) &
418	!$acc present( nzb_s_inner, rif, tend, var, zu, zw )
419	DO i = i_left, i_right
420	DO j = j_south, j_north
421	DO k = 1, nzt
422
423	IF ( k > nzb_s_inner(j,i) ) THEN
424	!
425	!-- Calculate the mixing length (for dissipation)
426	dvar_dz = atmos_ocean_sign * &
427	( var(k+1,j,i) - var(k-1,j,i) ) * dd2zu(k)
428	IF ( dvar_dz > 0.0_wp ) THEN
429	l_stable = 0.76_wp * SQRT( e(k,j,i) ) / &
430	SQRT( g / var(k,j,i) * dvar_dz ) + 1E-5_wp
431	ELSE
432	l_stable = l_grid(k)
433	ENDIF
434	!
435	!-- Adjustment of the mixing length
436	IF ( wall_adjustment ) THEN
437	l = MIN( wall_adjustment_factor * &
438	( zu(k) - zw(nzb_s_inner(j,i)) ), &
439	l_grid(k), l_stable )
440	ll = MIN( wall_adjustment_factor * &
441	( zu(k) - zw(nzb_s_inner(j,i)) ), &
442	l_grid(k) )
443	ELSE
444	l = MIN( l_grid(k), l_stable )
445	ll = l_grid(k)
446	ENDIF
447	!
448	!-- Calculate the tendency terms
449	dissipation = ( 0.19_wp + 0.74_wp * l / ll ) * &
450	e(k,j,i) * SQRT( e(k,j,i) ) / l
451
452	tend(k,j,i) = tend(k,j,i) &
453	+ ( &
454	( km(k,j,i)+km(k,j,i+1) ) * ( e(k,j,i+1)-e(k,j,i) ) &
455	- ( km(k,j,i)+km(k,j,i-1) ) * ( e(k,j,i)-e(k,j,i-1) ) &
456	) * ddx2 &
457	+ ( &
458	( km(k,j,i)+km(k,j+1,i) ) * ( e(k,j+1,i)-e(k,j,i) ) &
459	- ( km(k,j,i)+km(k,j-1,i) ) * ( e(k,j,i)-e(k,j-1,i) ) &
460	) * ddy2 &
461	+ ( &
462	( km(k,j,i)+km(k+1,j,i) ) * ( e(k+1,j,i)-e(k,j,i) ) * ddzu(k+1) &
463	- ( km(k,j,i)+km(k-1,j,i) ) * ( e(k,j,i)-e(k-1,j,i) ) * ddzu(k) &
464	) * ddzw(k) &
465	- dissipation
466
467	!
468	!-- Store dissipation if needed for calculating the sgs
469	!-- particle velocities
470	IF ( use_sgs_for_particles .OR. wang_kernel .OR. &
471	turbulence ) THEN
472	diss(k,j,i) = dissipation
473	ENDIF
474
475	ENDIF
476
477	ENDDO
478	ENDDO
479	ENDDO
480	!$acc end kernels
481
482	ENDIF
483
484	!
485	!-- Boundary condition for dissipation
486	IF ( use_sgs_for_particles .OR. wang_kernel .OR. turbulence ) THEN
487	!$acc kernels present( diss, nzb_s_inner )
488	DO i = i_left, i_right
489	DO j = j_south, j_north
490	diss(nzb_s_inner(j,i),j,i) = diss(nzb_s_inner(j,i)+1,j,i)
491	ENDDO
492	ENDDO
493	!$acc end kernels
494	ENDIF
495
496	END SUBROUTINE diffusion_e_acc
497
498
499	!------------------------------------------------------------------------------!
500	! Call for grid point i,j
501	!------------------------------------------------------------------------------!
502	SUBROUTINE diffusion_e_ij( i, j, var, var_reference )
503
504	USE arrays_3d, &
505	ONLY: dd2zu, ddzu, ddzw, diss, e, km, l_grid, tend, zu, zw
506
507	USE control_parameters, &
508	ONLY: atmos_ocean_sign, g, turbulence, use_single_reference_value, &
509	wall_adjustment, wall_adjustment_factor
510
511	USE grid_variables, &
512	ONLY: ddx2, ddy2
513
514	USE indices, &
515	ONLY: nzb, nzb_s_inner, nzt
516
517	USE kinds
518
519	USE particle_attributes, &
520	ONLY: use_sgs_for_particles, wang_kernel
521
522	IMPLICIT NONE
523
524	INTEGER(iwp) :: i !:
525	INTEGER(iwp) :: j !:
526	INTEGER(iwp) :: k !:
527	REAL(wp) :: dvar_dz !:
528	REAL(wp) :: l_stable !:
529	REAL(wp) :: var_reference !:
530
531	#if defined( __nopointer )
532	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !:
533	#else
534	REAL(wp), DIMENSION(:,:,:), POINTER :: var !:
535	#endif
536	REAL(wp), DIMENSION(nzb+1:nzt) :: dissipation !:
537	REAL(wp), DIMENSION(nzb+1:nzt) :: l !:
538	REAL(wp), DIMENSION(nzb+1:nzt) :: ll !:
539
540
541	!
542	!-- Calculate the mixing length (for dissipation)
543	DO k = nzb_s_inner(j,i)+1, nzt
544	dvar_dz = atmos_ocean_sign * &
545	( var(k+1,j,i) - var(k-1,j,i) ) * dd2zu(k)
546	IF ( dvar_dz > 0.0_wp ) THEN
547	IF ( use_single_reference_value ) THEN
548	l_stable = 0.76_wp * SQRT( e(k,j,i) ) / &
549	SQRT( g / var_reference * dvar_dz ) + 1E-5_wp
550	ELSE
551	l_stable = 0.76_wp * SQRT( e(k,j,i) ) / &
552	SQRT( g / var(k,j,i) * dvar_dz ) + 1E-5_wp
553	ENDIF
554	ELSE
555	l_stable = l_grid(k)
556	ENDIF
557	!
558	!-- Adjustment of the mixing length
559	IF ( wall_adjustment ) THEN
560	l(k) = MIN( wall_adjustment_factor * &
561	( zu(k) - zw(nzb_s_inner(j,i)) ), l_grid(k), &
562	l_stable )
563	ll(k) = MIN( wall_adjustment_factor * &
564	( zu(k) - zw(nzb_s_inner(j,i)) ), l_grid(k) )
565	ELSE
566	l(k) = MIN( l_grid(k), l_stable )
567	ll(k) = l_grid(k)
568	ENDIF
569	!
570	!-- Calculate the tendency term
571	dissipation(k) = ( 0.19_wp + 0.74_wp * l(k) / ll(k) ) * e(k,j,i) * &
572	SQRT( e(k,j,i) ) / l(k)
573
574	tend(k,j,i) = tend(k,j,i) &
575	+ ( &
576	( km(k,j,i)+km(k,j,i+1) ) * ( e(k,j,i+1)-e(k,j,i) ) &
577	- ( km(k,j,i)+km(k,j,i-1) ) * ( e(k,j,i)-e(k,j,i-1) ) &
578	) * ddx2 &
579	+ ( &
580	( km(k,j,i)+km(k,j+1,i) ) * ( e(k,j+1,i)-e(k,j,i) ) &
581	- ( km(k,j,i)+km(k,j-1,i) ) * ( e(k,j,i)-e(k,j-1,i) ) &
582	) * ddy2 &
583	+ ( &
584	( km(k,j,i)+km(k+1,j,i) ) * ( e(k+1,j,i)-e(k,j,i) ) * ddzu(k+1) &
585	- ( km(k,j,i)+km(k-1,j,i) ) * ( e(k,j,i)-e(k-1,j,i) ) * ddzu(k) &
586	) * ddzw(k) &
587	- dissipation(k)
588
589	ENDDO
590
591	!
592	!-- Store dissipation if needed for calculating the sgs particle velocities
593	IF ( use_sgs_for_particles .OR. wang_kernel .OR. turbulence ) THEN
594	DO k = nzb_s_inner(j,i)+1, nzt
595	diss(k,j,i) = dissipation(k)
596	ENDDO
597	!
598	!-- Boundary condition for dissipation
599	diss(nzb_s_inner(j,i),j,i) = diss(nzb_s_inner(j,i)+1,j,i)
600	ENDIF
601
602	END SUBROUTINE diffusion_e_ij
603
604	END MODULE diffusion_e_mod

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