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source: palm/trunk/SOURCE/diffusion_v.f90 @ 1202

Last change on this file since 1202 was 1132, checked in by raasch, 12 years ago
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1	MODULE diffusion_v_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 1997-2012 Leibniz University Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: diffusion_v.f90 1132 2013-04-12 14:35:30Z witha $
27	!
28	! 1128 2013-04-12 06:19:32Z raasch
29	! loop index bounds in accelerator version replaced by i_left, i_right, j_south,
30	! j_north
31	!
32	! 1036 2012-10-22 13:43:42Z raasch
33	! code put under GPL (PALM 3.9)
34	!
35	! 1015 2012-09-27 09:23:24Z raasch
36	! accelerator version (*_acc) added
37	!
38	! 1001 2012-09-13 14:08:46Z raasch
39	! arrays comunicated by module instead of parameter list
40	!
41	! 978 2012-08-09 08:28:32Z fricke
42	! outflow damping layer removed
43	! kmxm_x/_y and kmxp_x/_y change to kmxm and kmxp
44	!
45	! 667 2010-12-23 12:06:00Z suehring/gryschka
46	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng
47	!
48	! 366 2009-08-25 08:06:27Z raasch
49	! bc_lr replaced by bc_lr_cyc
50	!
51	! 106 2007-08-16 14:30:26Z raasch
52	! Momentumflux at top (vswst) included as boundary condition,
53	! j loop is starting from nysv (needed for non-cyclic boundary conditions)
54	!
55	! 75 2007-03-22 09:54:05Z raasch
56	! Wall functions now include diabatic conditions, call of routine wall_fluxes,
57	! z0 removed from argument list, vynp eliminated
58	!
59	! 20 2007-02-26 00:12:32Z raasch
60	! Bugfix: ddzw dimensioned 1:nzt"+1"
61	!
62	! RCS Log replace by Id keyword, revision history cleaned up
63	!
64	! Revision 1.15 2006/02/23 10:36:00 raasch
65	! nzb_2d replaced by nzb_v_outer in horizontal diffusion and by nzb_v_inner
66	! or nzb_diff_v, respectively, in vertical diffusion,
67	! wall functions added for north and south walls, +z0 in argument list,
68	! terms containing w(k-1,..) are removed from the Prandtl-layer equation
69	! because they cause errors at the edges of topography
70	! WARNING: loops containing the MAX function are still not properly vectorized!
71	!
72	! Revision 1.1 1997/09/12 06:24:01 raasch
73	! Initial revision
74	!
75	!
76	! Description:
77	! ------------
78	! Diffusion term of the v-component
79	!------------------------------------------------------------------------------!
80
81	USE wall_fluxes_mod
82
83	PRIVATE
84	PUBLIC diffusion_v, diffusion_v_acc
85
86	INTERFACE diffusion_v
87	MODULE PROCEDURE diffusion_v
88	MODULE PROCEDURE diffusion_v_ij
89	END INTERFACE diffusion_v
90
91	INTERFACE diffusion_v_acc
92	MODULE PROCEDURE diffusion_v_acc
93	END INTERFACE diffusion_v_acc
94
95	CONTAINS
96
97
98	!------------------------------------------------------------------------------!
99	! Call for all grid points
100	!------------------------------------------------------------------------------!
101	SUBROUTINE diffusion_v
102
103	USE arrays_3d
104	USE control_parameters
105	USE grid_variables
106	USE indices
107
108	IMPLICIT NONE
109
110	INTEGER :: i, j, k
111	REAL :: kmxm, kmxp, kmzm, kmzp
112
113	REAL, DIMENSION(nzb:nzt+1,nys:nyn,nxl:nxr) :: vsus
114
115	!
116	!-- First calculate horizontal momentum flux v'u' at vertical walls,
117	!-- if neccessary
118	IF ( topography /= 'flat' ) THEN
119	CALL wall_fluxes( vsus, 0.0, 1.0, 0.0, 0.0, nzb_v_inner, &
120	nzb_v_outer, wall_v )
121	ENDIF
122
123	DO i = nxl, nxr
124	DO j = nysv, nyn
125	!
126	!-- Compute horizontal diffusion
127	DO k = nzb_v_outer(j,i)+1, nzt
128	!
129	!-- Interpolate eddy diffusivities on staggered gridpoints
130	kmxp = 0.25 * &
131	( km(k,j,i)+km(k,j,i+1)+km(k,j-1,i)+km(k,j-1,i+1) )
132	kmxm = 0.25 * &
133	( km(k,j,i)+km(k,j,i-1)+km(k,j-1,i)+km(k,j-1,i-1) )
134
135	tend(k,j,i) = tend(k,j,i) &
136	& + ( kmxp * ( v(k,j,i+1) - v(k,j,i) ) * ddx &
137	& + kmxp * ( u(k,j,i+1) - u(k,j-1,i+1) ) * ddy &
138	& - kmxm * ( v(k,j,i) - v(k,j,i-1) ) * ddx &
139	& - kmxm * ( u(k,j,i) - u(k,j-1,i) ) * ddy &
140	& ) * ddx &
141	& + 2.0 * ( &
142	& km(k,j,i) * ( v(k,j+1,i) - v(k,j,i) ) &
143	& - km(k,j-1,i) * ( v(k,j,i) - v(k,j-1,i) ) &
144	& ) * ddy2
145	ENDDO
146
147	!
148	!-- Wall functions at the left and right walls, respectively
149	IF ( wall_v(j,i) /= 0.0 ) THEN
150
151	DO k = nzb_v_inner(j,i)+1, nzb_v_outer(j,i)
152	kmxp = 0.25 * &
153	( km(k,j,i)+km(k,j,i+1)+km(k,j-1,i)+km(k,j-1,i+1) )
154	kmxm = 0.25 * &
155	( km(k,j,i)+km(k,j,i-1)+km(k,j-1,i)+km(k,j-1,i-1) )
156
157	tend(k,j,i) = tend(k,j,i) &
158	+ 2.0 * ( &
159	km(k,j,i) * ( v(k,j+1,i) - v(k,j,i) ) &
160	- km(k,j-1,i) * ( v(k,j,i) - v(k,j-1,i) ) &
161	) * ddy2 &
162	+ ( fxp(j,i) * ( &
163	kmxp * ( v(k,j,i+1) - v(k,j,i) ) * ddx &
164	+ kmxp * ( u(k,j,i+1) - u(k,j-1,i+1) ) * ddy &
165	) &
166	- fxm(j,i) * ( &
167	kmxm * ( v(k,j,i) - v(k,j,i-1) ) * ddx &
168	+ kmxm * ( u(k,j,i) - u(k,j-1,i) ) * ddy &
169	) &
170	+ wall_v(j,i) * vsus(k,j,i) &
171	) * ddx
172	ENDDO
173	ENDIF
174
175	!
176	!-- Compute vertical diffusion. In case of simulating a Prandtl
177	!-- layer, index k starts at nzb_v_inner+2.
178	DO k = nzb_diff_v(j,i), nzt_diff
179	!
180	!-- Interpolate eddy diffusivities on staggered gridpoints
181	kmzp = 0.25 * &
182	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
183	kmzm = 0.25 * &
184	( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )
185
186	tend(k,j,i) = tend(k,j,i) &
187	& + ( kmzp * ( ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
188	& + ( w(k,j,i) - w(k,j-1,i) ) * ddy &
189	& ) &
190	& - kmzm * ( ( v(k,j,i) - v(k-1,j,i) ) * ddzu(k) &
191	& + ( w(k-1,j,i) - w(k-1,j-1,i) ) * ddy &
192	& ) &
193	& ) * ddzw(k)
194	ENDDO
195
196	!
197	!-- Vertical diffusion at the first grid point above the surface,
198	!-- if the momentum flux at the bottom is given by the Prandtl law
199	!-- or if it is prescribed by the user.
200	!-- Difference quotient of the momentum flux is not formed over
201	!-- half of the grid spacing (2.0*ddzw(k)) any more, since the
202	!-- comparison with other (LES) modell showed that the values of
203	!-- the momentum flux becomes too large in this case.
204	!-- The term containing w(k-1,..) (see above equation) is removed here
205	!-- because the vertical velocity is assumed to be zero at the surface.
206	IF ( use_surface_fluxes ) THEN
207	k = nzb_v_inner(j,i)+1
208	!
209	!-- Interpolate eddy diffusivities on staggered gridpoints
210	kmzp = 0.25 * &
211	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
212	kmzm = 0.25 * &
213	( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )
214
215	tend(k,j,i) = tend(k,j,i) &
216	& + ( kmzp * ( w(k,j,i) - w(k,j-1,i) ) * ddy &
217	& ) * ddzw(k) &
218	& + ( kmzp * ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
219	& + vsws(j,i) &
220	& ) * ddzw(k)
221	ENDIF
222
223	!
224	!-- Vertical diffusion at the first gridpoint below the top boundary,
225	!-- if the momentum flux at the top is prescribed by the user
226	IF ( use_top_fluxes .AND. constant_top_momentumflux ) THEN
227	k = nzt
228	!
229	!-- Interpolate eddy diffusivities on staggered gridpoints
230	kmzp = 0.25 * &
231	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
232	kmzm = 0.25 * &
233	( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )
234
235	tend(k,j,i) = tend(k,j,i) &
236	& - ( kmzm * ( w(k-1,j,i) - w(k-1,j-1,i) ) * ddy &
237	& ) * ddzw(k) &
238	& + ( -vswst(j,i) &
239	& - kmzm * ( v(k,j,i) - v(k-1,j,i) ) * ddzu(k) &
240	& ) * ddzw(k)
241	ENDIF
242
243	ENDDO
244	ENDDO
245
246	END SUBROUTINE diffusion_v
247
248
249	!------------------------------------------------------------------------------!
250	! Call for all grid points - accelerator version
251	!------------------------------------------------------------------------------!
252	SUBROUTINE diffusion_v_acc
253
254	USE arrays_3d
255	USE control_parameters
256	USE grid_variables
257	USE indices
258
259	IMPLICIT NONE
260
261	INTEGER :: i, j, k
262	REAL :: kmxm, kmxp, kmzm, kmzp
263
264	!$acc declare create ( vsus )
265	REAL, DIMENSION(nzb:nzt+1,nys:nyn,nxl:nxr) :: vsus
266
267	!
268	!-- First calculate horizontal momentum flux v'u' at vertical walls,
269	!-- if neccessary
270	IF ( topography /= 'flat' ) THEN
271	CALL wall_fluxes_acc( vsus, 0.0, 1.0, 0.0, 0.0, nzb_v_inner, &
272	nzb_v_outer, wall_v )
273	ENDIF
274
275	!$acc kernels present ( u, v, w, km, tend, vsws, vswst ) &
276	!$acc present ( ddzu, ddzw, fxm, fxp, wall_v ) &
277	!$acc present ( nzb_v_inner, nzb_v_outer, nzb_diff_v )
278	!$acc loop
279	DO i = i_left, i_right
280	DO j = j_south, j_north
281	!
282	!-- Compute horizontal diffusion
283	!$acc loop vector(32)
284	DO k = 1, nzt
285	IF ( k > nzb_v_outer(j,i) ) THEN
286	!
287	!-- Interpolate eddy diffusivities on staggered gridpoints
288	kmxp = 0.25 * &
289	( km(k,j,i)+km(k,j,i+1)+km(k,j-1,i)+km(k,j-1,i+1) )
290	kmxm = 0.25 * &
291	( km(k,j,i)+km(k,j,i-1)+km(k,j-1,i)+km(k,j-1,i-1) )
292
293	tend(k,j,i) = tend(k,j,i) &
294	& + ( kmxp * ( v(k,j,i+1) - v(k,j,i) ) * ddx &
295	& + kmxp * ( u(k,j,i+1) - u(k,j-1,i+1) ) * ddy &
296	& - kmxm * ( v(k,j,i) - v(k,j,i-1) ) * ddx &
297	& - kmxm * ( u(k,j,i) - u(k,j-1,i) ) * ddy &
298	& ) * ddx &
299	& + 2.0 * ( &
300	& km(k,j,i) * ( v(k,j+1,i) - v(k,j,i) ) &
301	& - km(k,j-1,i) * ( v(k,j,i) - v(k,j-1,i) ) &
302	& ) * ddy2
303	ENDIF
304	ENDDO
305
306	!
307	!-- Wall functions at the left and right walls, respectively
308	!$acc loop vector(32)
309	DO k = 1, nzt
310	IF( k > nzb_v_inner(j,i) .AND. k <= nzb_v_outer(j,i) .AND. &
311	wall_v(j,i) /= 0.0 ) THEN
312
313	kmxp = 0.25 * &
314	( km(k,j,i)+km(k,j,i+1)+km(k,j-1,i)+km(k,j-1,i+1) )
315	kmxm = 0.25 * &
316	( km(k,j,i)+km(k,j,i-1)+km(k,j-1,i)+km(k,j-1,i-1) )
317
318	tend(k,j,i) = tend(k,j,i) &
319	+ 2.0 * ( &
320	km(k,j,i) * ( v(k,j+1,i) - v(k,j,i) ) &
321	- km(k,j-1,i) * ( v(k,j,i) - v(k,j-1,i) ) &
322	) * ddy2 &
323	+ ( fxp(j,i) * ( &
324	kmxp * ( v(k,j,i+1) - v(k,j,i) ) * ddx &
325	+ kmxp * ( u(k,j,i+1) - u(k,j-1,i+1) ) * ddy &
326	) &
327	- fxm(j,i) * ( &
328	kmxm * ( v(k,j,i) - v(k,j,i-1) ) * ddx &
329	+ kmxm * ( u(k,j,i) - u(k,j-1,i) ) * ddy &
330	) &
331	+ wall_v(j,i) * vsus(k,j,i) &
332	) * ddx
333	ENDIF
334	ENDDO
335
336	!
337	!-- Compute vertical diffusion. In case of simulating a Prandtl
338	!-- layer, index k starts at nzb_v_inner+2.
339	!$acc loop vector(32)
340	DO k = 1, nzt_diff
341	IF ( k >= nzb_diff_v(j,i) ) THEN
342	!
343	!-- Interpolate eddy diffusivities on staggered gridpoints
344	kmzp = 0.25 * &
345	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
346	kmzm = 0.25 * &
347	( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )
348
349	tend(k,j,i) = tend(k,j,i) &
350	& + ( kmzp * ( ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1)&
351	& + ( w(k,j,i) - w(k,j-1,i) ) * ddy &
352	& ) &
353	& - kmzm * ( ( v(k,j,i) - v(k-1,j,i) ) * ddzu(k)&
354	& + ( w(k-1,j,i) - w(k-1,j-1,i) ) * ddy &
355	& ) &
356	& ) * ddzw(k)
357	ENDIF
358	ENDDO
359
360	ENDDO
361	ENDDO
362
363	!
364	!-- Vertical diffusion at the first grid point above the surface,
365	!-- if the momentum flux at the bottom is given by the Prandtl law
366	!-- or if it is prescribed by the user.
367	!-- Difference quotient of the momentum flux is not formed over
368	!-- half of the grid spacing (2.0*ddzw(k)) any more, since the
369	!-- comparison with other (LES) modell showed that the values of
370	!-- the momentum flux becomes too large in this case.
371	!-- The term containing w(k-1,..) (see above equation) is removed here
372	!-- because the vertical velocity is assumed to be zero at the surface.
373	IF ( use_surface_fluxes ) THEN
374
375	!$acc loop
376	DO i = i_left, i_right
377	!$acc loop vector(32)
378	DO j = j_south, j_north
379
380	k = nzb_v_inner(j,i)+1
381	!
382	!-- Interpolate eddy diffusivities on staggered gridpoints
383	kmzp = 0.25 * &
384	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
385	kmzm = 0.25 * &
386	( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )
387
388	tend(k,j,i) = tend(k,j,i) &
389	& + ( kmzp * ( w(k,j,i) - w(k,j-1,i) ) * ddy &
390	& ) * ddzw(k) &
391	& + ( kmzp * ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
392	& + vsws(j,i) &
393	& ) * ddzw(k)
394	ENDDO
395	ENDDO
396
397	ENDIF
398
399	!
400	!-- Vertical diffusion at the first gridpoint below the top boundary,
401	!-- if the momentum flux at the top is prescribed by the user
402	IF ( use_top_fluxes .AND. constant_top_momentumflux ) THEN
403
404	k = nzt
405
406	!$acc loop
407	DO i = i_left, i_right
408	!$acc loop vector(32)
409	DO j = j_south, j_north
410
411	!
412	!-- Interpolate eddy diffusivities on staggered gridpoints
413	kmzp = 0.25 * &
414	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
415	kmzm = 0.25 * &
416	( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )
417
418	tend(k,j,i) = tend(k,j,i) &
419	& - ( kmzm * ( w(k-1,j,i) - w(k-1,j-1,i) ) * ddy &
420	& ) * ddzw(k) &
421	& + ( -vswst(j,i) &
422	& - kmzm * ( v(k,j,i) - v(k-1,j,i) ) * ddzu(k) &
423	& ) * ddzw(k)
424	ENDDO
425	ENDDO
426
427	ENDIF
428	!$acc end kernels
429
430	END SUBROUTINE diffusion_v_acc
431
432
433	!------------------------------------------------------------------------------!
434	! Call for grid point i,j
435	!------------------------------------------------------------------------------!
436	SUBROUTINE diffusion_v_ij( i, j )
437
438	USE arrays_3d
439	USE control_parameters
440	USE grid_variables
441	USE indices
442
443	IMPLICIT NONE
444
445	INTEGER :: i, j, k
446	REAL :: kmxm, kmxp, kmzm, kmzp
447
448	REAL, DIMENSION(nzb:nzt+1) :: vsus
449
450	!
451	!-- Compute horizontal diffusion
452	DO k = nzb_v_outer(j,i)+1, nzt
453	!
454	!-- Interpolate eddy diffusivities on staggered gridpoints
455	kmxp = 0.25 * ( km(k,j,i)+km(k,j,i+1)+km(k,j-1,i)+km(k,j-1,i+1) )
456	kmxm = 0.25 * ( km(k,j,i)+km(k,j,i-1)+km(k,j-1,i)+km(k,j-1,i-1) )
457
458	tend(k,j,i) = tend(k,j,i) &
459	& + ( kmxp * ( v(k,j,i+1) - v(k,j,i) ) * ddx &
460	& + kmxp * ( u(k,j,i+1) - u(k,j-1,i+1) ) * ddy &
461	& - kmxm * ( v(k,j,i) - v(k,j,i-1) ) * ddx &
462	& - kmxm * ( u(k,j,i) - u(k,j-1,i) ) * ddy &
463	& ) * ddx &
464	& + 2.0 * ( &
465	& km(k,j,i) * ( v(k,j+1,i) - v(k,j,i) ) &
466	& - km(k,j-1,i) * ( v(k,j,i) - v(k,j-1,i) ) &
467	& ) * ddy2
468	ENDDO
469
470	!
471	!-- Wall functions at the left and right walls, respectively
472	IF ( wall_v(j,i) /= 0.0 ) THEN
473
474	!
475	!-- Calculate the horizontal momentum flux v'u'
476	CALL wall_fluxes( i, j, nzb_v_inner(j,i)+1, nzb_v_outer(j,i), &
477	vsus, 0.0, 1.0, 0.0, 0.0 )
478
479	DO k = nzb_v_inner(j,i)+1, nzb_v_outer(j,i)
480	kmxp = 0.25 * &
481	( km(k,j,i)+km(k,j,i+1)+km(k,j-1,i)+km(k,j-1,i+1) )
482	kmxm = 0.25 * &
483	( km(k,j,i)+km(k,j,i-1)+km(k,j-1,i)+km(k,j-1,i-1) )
484
485	tend(k,j,i) = tend(k,j,i) &
486	+ 2.0 * ( &
487	km(k,j,i) * ( v(k,j+1,i) - v(k,j,i) ) &
488	- km(k,j-1,i) * ( v(k,j,i) - v(k,j-1,i) ) &
489	) * ddy2 &
490	+ ( fxp(j,i) * ( &
491	kmxp * ( v(k,j,i+1) - v(k,j,i) ) * ddx &
492	+ kmxp * ( u(k,j,i+1) - u(k,j-1,i+1) ) * ddy &
493	) &
494	- fxm(j,i) * ( &
495	kmxm * ( v(k,j,i) - v(k,j,i-1) ) * ddx &
496	+ kmxm * ( u(k,j,i) - u(k,j-1,i) ) * ddy &
497	) &
498	+ wall_v(j,i) * vsus(k) &
499	) * ddx
500	ENDDO
501	ENDIF
502
503	!
504	!-- Compute vertical diffusion. In case of simulating a Prandtl layer,
505	!-- index k starts at nzb_v_inner+2.
506	DO k = nzb_diff_v(j,i), nzt_diff
507	!
508	!-- Interpolate eddy diffusivities on staggered gridpoints
509	kmzp = 0.25 * ( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
510	kmzm = 0.25 * ( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )
511
512	tend(k,j,i) = tend(k,j,i) &
513	& + ( kmzp * ( ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
514	& + ( w(k,j,i) - w(k,j-1,i) ) * ddy &
515	& ) &
516	& - kmzm * ( ( v(k,j,i) - v(k-1,j,i) ) * ddzu(k) &
517	& + ( w(k-1,j,i) - w(k-1,j-1,i) ) * ddy &
518	& ) &
519	& ) * ddzw(k)
520	ENDDO
521
522	!
523	!-- Vertical diffusion at the first grid point above the surface, if the
524	!-- momentum flux at the bottom is given by the Prandtl law or if it is
525	!-- prescribed by the user.
526	!-- Difference quotient of the momentum flux is not formed over half of
527	!-- the grid spacing (2.0*ddzw(k)) any more, since the comparison with
528	!-- other (LES) modell showed that the values of the momentum flux becomes
529	!-- too large in this case.
530	!-- The term containing w(k-1,..) (see above equation) is removed here
531	!-- because the vertical velocity is assumed to be zero at the surface.
532	IF ( use_surface_fluxes ) THEN
533	k = nzb_v_inner(j,i)+1
534	!
535	!-- Interpolate eddy diffusivities on staggered gridpoints
536	kmzp = 0.25 * ( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
537	kmzm = 0.25 * ( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )
538
539	tend(k,j,i) = tend(k,j,i) &
540	& + ( kmzp * ( w(k,j,i) - w(k,j-1,i) ) * ddy &
541	& ) * ddzw(k) &
542	& + ( kmzp * ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
543	& + vsws(j,i) &
544	& ) * ddzw(k)
545	ENDIF
546
547	!
548	!-- Vertical diffusion at the first gridpoint below the top boundary,
549	!-- if the momentum flux at the top is prescribed by the user
550	IF ( use_top_fluxes .AND. constant_top_momentumflux ) THEN
551	k = nzt
552	!
553	!-- Interpolate eddy diffusivities on staggered gridpoints
554	kmzp = 0.25 * &
555	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
556	kmzm = 0.25 * &
557	( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )
558
559	tend(k,j,i) = tend(k,j,i) &
560	& - ( kmzm * ( w(k-1,j,i) - w(k-1,j-1,i) ) * ddy &
561	& ) * ddzw(k) &
562	& + ( -vswst(j,i) &
563	& - kmzm * ( v(k,j,i) - v(k-1,j,i) ) * ddzu(k) &
564	& ) * ddzw(k)
565	ENDIF
566
567	END SUBROUTINE diffusion_v_ij
568
569	END MODULE diffusion_v_mod

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