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source: palm/trunk/SOURCE/diffusion_s.f90 @ 1207

Last change on this file since 1207 was 1132, checked in by raasch, 12 years ago
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1	MODULE diffusion_s_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_s.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	! 1092 2013-02-02 11:24:22Z raasch
33	! unused variables removed
34	!
35	! 1036 2012-10-22 13:43:42Z raasch
36	! code put under GPL (PALM 3.9)
37	!
38	! 1015 2012-09-27 09:23:24Z raasch
39	! accelerator version (*_acc) added
40	!
41	! 1010 2012-09-20 07:59:54Z raasch
42	! cpp switch __nopointer added for pointer free version
43	!
44	! 1001 2012-09-13 14:08:46Z raasch
45	! some arrays comunicated by module instead of parameter list
46	!
47	! 667 2010-12-23 12:06:00Z suehring/gryschka
48	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng
49	!
50	! 183 2008-08-04 15:39:12Z letzel
51	! bugfix: calculation of fluxes at vertical surfaces
52	!
53	! 129 2007-10-30 12:12:24Z letzel
54	! replace wall_heatflux by wall_s_flux that is now included in the parameter
55	! list, bugfix for assignment of fluxes at walls
56	!
57	! 20 2007-02-26 00:12:32Z raasch
58	! Bugfix: ddzw dimensioned 1:nzt"+1"
59	! Calculation extended for gridpoint nzt, fluxes can be given at top,
60	! +s_flux_t in parameter list, s_flux renamed s_flux_b
61	!
62	! RCS Log replace by Id keyword, revision history cleaned up
63	!
64	! Revision 1.8 2006/02/23 10:34:17 raasch
65	! nzb_2d replaced by nzb_s_outer in horizontal diffusion and by nzb_s_inner
66	! or nzb_diff_s_inner, respectively, in vertical diffusion, prescribed surface
67	! fluxes at vertically oriented topography
68	!
69	! Revision 1.1 2000/04/13 14:54:02 schroeter
70	! Initial revision
71	!
72	!
73	! Description:
74	! ------------
75	! Diffusion term of scalar quantities (temperature and water content)
76	!------------------------------------------------------------------------------!
77
78	PRIVATE
79	PUBLIC diffusion_s, diffusion_s_acc
80
81	INTERFACE diffusion_s
82	MODULE PROCEDURE diffusion_s
83	MODULE PROCEDURE diffusion_s_ij
84	END INTERFACE diffusion_s
85
86	INTERFACE diffusion_s_acc
87	MODULE PROCEDURE diffusion_s_acc
88	END INTERFACE diffusion_s_acc
89
90	CONTAINS
91
92
93	!------------------------------------------------------------------------------!
94	! Call for all grid points
95	!------------------------------------------------------------------------------!
96	SUBROUTINE diffusion_s( s, s_flux_b, s_flux_t, wall_s_flux )
97
98	USE arrays_3d
99	USE control_parameters
100	USE grid_variables
101	USE indices
102
103	IMPLICIT NONE
104
105	INTEGER :: i, j, k
106	REAL :: wall_s_flux(0:4)
107	REAL, DIMENSION(nysg:nyng,nxlg:nxrg) :: s_flux_b, s_flux_t
108	#if defined( __nopointer )
109	REAL, DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: s
110	#else
111	REAL, DIMENSION(:,:,:), POINTER :: s
112	#endif
113
114	DO i = nxl, nxr
115	DO j = nys,nyn
116	!
117	!-- Compute horizontal diffusion
118	DO k = nzb_s_outer(j,i)+1, nzt
119
120	tend(k,j,i) = tend(k,j,i) &
121	+ 0.5 * ( &
122	( kh(k,j,i) + kh(k,j,i+1) ) * ( s(k,j,i+1)-s(k,j,i) ) &
123	- ( kh(k,j,i) + kh(k,j,i-1) ) * ( s(k,j,i)-s(k,j,i-1) ) &
124	) * ddx2 &
125	+ 0.5 * ( &
126	( kh(k,j,i) + kh(k,j+1,i) ) * ( s(k,j+1,i)-s(k,j,i) ) &
127	- ( kh(k,j,i) + kh(k,j-1,i) ) * ( s(k,j,i)-s(k,j-1,i) ) &
128	) * ddy2
129	ENDDO
130
131	!
132	!-- Apply prescribed horizontal wall heatflux where necessary
133	IF ( ( wall_w_x(j,i) .NE. 0.0 ) .OR. ( wall_w_y(j,i) .NE. 0.0 ) ) &
134	THEN
135	DO k = nzb_s_inner(j,i)+1, nzb_s_outer(j,i)
136
137	tend(k,j,i) = tend(k,j,i) &
138	+ ( fwxp(j,i) * 0.5 * &
139	( kh(k,j,i) + kh(k,j,i+1) ) * ( s(k,j,i+1)-s(k,j,i) ) &
140	+ ( 1.0 - fwxp(j,i) ) * wall_s_flux(1) &
141	-fwxm(j,i) * 0.5 * &
142	( kh(k,j,i) + kh(k,j,i-1) ) * ( s(k,j,i)-s(k,j,i-1) ) &
143	+ ( 1.0 - fwxm(j,i) ) * wall_s_flux(2) &
144	) * ddx2 &
145	+ ( fwyp(j,i) * 0.5 * &
146	( kh(k,j,i) + kh(k,j+1,i) ) * ( s(k,j+1,i)-s(k,j,i) ) &
147	+ ( 1.0 - fwyp(j,i) ) * wall_s_flux(3) &
148	-fwym(j,i) * 0.5 * &
149	( kh(k,j,i) + kh(k,j-1,i) ) * ( s(k,j,i)-s(k,j-1,i) ) &
150	+ ( 1.0 - fwym(j,i) ) * wall_s_flux(4) &
151	) * ddy2
152	ENDDO
153	ENDIF
154
155	!
156	!-- Compute vertical diffusion. In case that surface fluxes have been
157	!-- prescribed or computed at bottom and/or top, index k starts/ends at
158	!-- nzb+2 or nzt-1, respectively.
159	DO k = nzb_diff_s_inner(j,i), nzt_diff
160
161	tend(k,j,i) = tend(k,j,i) &
162	+ 0.5 * ( &
163	( kh(k,j,i) + kh(k+1,j,i) ) * ( s(k+1,j,i)-s(k,j,i) ) * ddzu(k+1) &
164	- ( kh(k,j,i) + kh(k-1,j,i) ) * ( s(k,j,i)-s(k-1,j,i) ) * ddzu(k) &
165	) * ddzw(k)
166	ENDDO
167
168	!
169	!-- Vertical diffusion at the first computational gridpoint along
170	!-- z-direction
171	IF ( use_surface_fluxes ) THEN
172
173	k = nzb_s_inner(j,i)+1
174
175	tend(k,j,i) = tend(k,j,i) &
176	+ ( 0.5 * ( kh(k,j,i)+kh(k+1,j,i) ) &
177	* ( s(k+1,j,i)-s(k,j,i) ) &
178	* ddzu(k+1) &
179	+ s_flux_b(j,i) &
180	) * ddzw(k)
181
182	ENDIF
183
184	!
185	!-- Vertical diffusion at the last computational gridpoint along
186	!-- z-direction
187	IF ( use_top_fluxes ) THEN
188
189	k = nzt
190
191	tend(k,j,i) = tend(k,j,i) &
192	+ ( - s_flux_t(j,i) &
193	- 0.5 * ( kh(k-1,j,i)+kh(k,j,i) ) &
194	* ( s(k,j,i)-s(k-1,j,i) ) &
195	* ddzu(k) &
196	) * ddzw(k)
197
198	ENDIF
199
200	ENDDO
201	ENDDO
202
203	END SUBROUTINE diffusion_s
204
205
206	!------------------------------------------------------------------------------!
207	! Call for all grid points - accelerator version
208	!------------------------------------------------------------------------------!
209	SUBROUTINE diffusion_s_acc( s, s_flux_b, s_flux_t, wall_s_flux )
210
211	USE arrays_3d
212	USE control_parameters
213	USE grid_variables
214	USE indices
215
216	IMPLICIT NONE
217
218	INTEGER :: i, j, k
219	REAL :: wall_s_flux(0:4)
220	REAL, DIMENSION(nysg:nyng,nxlg:nxrg) :: s_flux_b, s_flux_t
221	#if defined( __nopointer )
222	REAL, DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: s
223	#else
224	REAL, DIMENSION(:,:,:), POINTER :: s
225	#endif
226
227	!$acc kernels present( ddzu, ddzw, fwxm, fwxp, fwym, fwyp, kh ) &
228	!$acc present( nzb_diff_s_inner, nzb_s_inner, nzb_s_outer, s ) &
229	!$acc present( s_flux_b, s_flux_t, tend, wall_s_flux ) &
230	!$acc present( wall_w_x, wall_w_y )
231	!$acc loop
232	DO i = i_left, i_right
233	DO j = j_south, j_north
234	!
235	!-- Compute horizontal diffusion
236	!$acc loop vector( 32 )
237	DO k = 1, nzt
238	IF ( k > nzb_s_outer(j,i) ) THEN
239
240	tend(k,j,i) = tend(k,j,i) &
241	+ 0.5 * ( &
242	( kh(k,j,i) + kh(k,j,i+1) ) * ( s(k,j,i+1)-s(k,j,i) ) &
243	- ( kh(k,j,i) + kh(k,j,i-1) ) * ( s(k,j,i)-s(k,j,i-1) ) &
244	) * ddx2 &
245	+ 0.5 * ( &
246	( kh(k,j,i) + kh(k,j+1,i) ) * ( s(k,j+1,i)-s(k,j,i) ) &
247	- ( kh(k,j,i) + kh(k,j-1,i) ) * ( s(k,j,i)-s(k,j-1,i) ) &
248	) * ddy2
249	ENDIF
250	ENDDO
251
252	!
253	!-- Apply prescribed horizontal wall heatflux where necessary
254	!$acc loop vector(32)
255	DO k = 1, nzt
256	IF ( k > nzb_s_inner(j,i) .AND. k <= nzb_s_outer(j,i) .AND. &
257	( wall_w_x(j,i) /= 0.0 .OR. wall_w_y(j,i) /= 0.0 ) ) &
258	THEN
259	tend(k,j,i) = tend(k,j,i) &
260	+ ( fwxp(j,i) * 0.5 * &
261	( kh(k,j,i) + kh(k,j,i+1) ) * ( s(k,j,i+1)-s(k,j,i) ) &
262	+ ( 1.0 - fwxp(j,i) ) * wall_s_flux(1) &
263	-fwxm(j,i) * 0.5 * &
264	( kh(k,j,i) + kh(k,j,i-1) ) * ( s(k,j,i)-s(k,j,i-1) ) &
265	+ ( 1.0 - fwxm(j,i) ) * wall_s_flux(2) &
266	) * ddx2 &
267	+ ( fwyp(j,i) * 0.5 * &
268	( kh(k,j,i) + kh(k,j+1,i) ) * ( s(k,j+1,i)-s(k,j,i) ) &
269	+ ( 1.0 - fwyp(j,i) ) * wall_s_flux(3) &
270	-fwym(j,i) * 0.5 * &
271	( kh(k,j,i) + kh(k,j-1,i) ) * ( s(k,j,i)-s(k,j-1,i) ) &
272	+ ( 1.0 - fwym(j,i) ) * wall_s_flux(4) &
273	) * ddy2
274	ENDIF
275	ENDDO
276
277	!
278	!-- Compute vertical diffusion. In case that surface fluxes have been
279	!-- prescribed or computed at bottom and/or top, index k starts/ends at
280	!-- nzb+2 or nzt-1, respectively.
281	!$acc loop vector( 32 )
282	DO k = 1, nzt_diff
283	IF ( k >= nzb_diff_s_inner(j,i) ) THEN
284	tend(k,j,i) = tend(k,j,i) &
285	+ 0.5 * ( &
286	( kh(k,j,i) + kh(k+1,j,i) ) * ( s(k+1,j,i)-s(k,j,i) ) * ddzu(k+1) &
287	- ( kh(k,j,i) + kh(k-1,j,i) ) * ( s(k,j,i)-s(k-1,j,i) ) * ddzu(k) &
288	) * ddzw(k)
289	ENDIF
290	ENDDO
291
292	!
293	!-- Vertical diffusion at the first computational gridpoint along
294	!-- z-direction
295	!$acc loop vector( 32 )
296	DO k = 1, nzt
297	IF ( use_surface_fluxes .AND. k == nzb_s_inner(j,i)+1 ) THEN
298	tend(k,j,i) = tend(k,j,i) &
299	+ ( 0.5 * ( kh(k,j,i)+kh(k+1,j,i) ) &
300	* ( s(k+1,j,i)-s(k,j,i) ) &
301	* ddzu(k+1) &
302	+ s_flux_b(j,i) &
303	) * ddzw(k)
304	ENDIF
305
306	!
307	!-- Vertical diffusion at the last computational gridpoint along
308	!-- z-direction
309	IF ( use_top_fluxes .AND. k == nzt ) THEN
310	tend(k,j,i) = tend(k,j,i) &
311	+ ( - s_flux_t(j,i) &
312	- 0.5 * ( kh(k-1,j,i)+kh(k,j,i) )&
313	* ( s(k,j,i)-s(k-1,j,i) ) &
314	* ddzu(k) &
315	) * ddzw(k)
316	ENDIF
317	ENDDO
318
319	ENDDO
320	ENDDO
321	!$acc end kernels
322
323	END SUBROUTINE diffusion_s_acc
324
325
326	!------------------------------------------------------------------------------!
327	! Call for grid point i,j
328	!------------------------------------------------------------------------------!
329	SUBROUTINE diffusion_s_ij( i, j, s, s_flux_b, s_flux_t, wall_s_flux )
330
331	USE arrays_3d
332	USE control_parameters
333	USE grid_variables
334	USE indices
335
336	IMPLICIT NONE
337
338	INTEGER :: i, j, k
339	REAL :: wall_s_flux(0:4)
340	REAL, DIMENSION(nysg:nyng,nxlg:nxrg) :: s_flux_b, s_flux_t
341	#if defined( __nopointer )
342	REAL, DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: s
343	#else
344	REAL, DIMENSION(:,:,:), POINTER :: s
345	#endif
346
347	!
348	!-- Compute horizontal diffusion
349	DO k = nzb_s_outer(j,i)+1, nzt
350
351	tend(k,j,i) = tend(k,j,i) &
352	+ 0.5 * ( &
353	( kh(k,j,i) + kh(k,j,i+1) ) * ( s(k,j,i+1)-s(k,j,i) ) &
354	- ( kh(k,j,i) + kh(k,j,i-1) ) * ( s(k,j,i)-s(k,j,i-1) ) &
355	) * ddx2 &
356	+ 0.5 * ( &
357	( kh(k,j,i) + kh(k,j+1,i) ) * ( s(k,j+1,i)-s(k,j,i) ) &
358	- ( kh(k,j,i) + kh(k,j-1,i) ) * ( s(k,j,i)-s(k,j-1,i) ) &
359	) * ddy2
360	ENDDO
361
362	!
363	!-- Apply prescribed horizontal wall heatflux where necessary
364	IF ( ( wall_w_x(j,i) .NE. 0.0 ) .OR. ( wall_w_y(j,i) .NE. 0.0 ) ) &
365	THEN
366	DO k = nzb_s_inner(j,i)+1, nzb_s_outer(j,i)
367
368	tend(k,j,i) = tend(k,j,i) &
369	+ ( fwxp(j,i) * 0.5 * &
370	( kh(k,j,i) + kh(k,j,i+1) ) * ( s(k,j,i+1)-s(k,j,i) ) &
371	+ ( 1.0 - fwxp(j,i) ) * wall_s_flux(1) &
372	-fwxm(j,i) * 0.5 * &
373	( kh(k,j,i) + kh(k,j,i-1) ) * ( s(k,j,i)-s(k,j,i-1) ) &
374	+ ( 1.0 - fwxm(j,i) ) * wall_s_flux(2) &
375	) * ddx2 &
376	+ ( fwyp(j,i) * 0.5 * &
377	( kh(k,j,i) + kh(k,j+1,i) ) * ( s(k,j+1,i)-s(k,j,i) ) &
378	+ ( 1.0 - fwyp(j,i) ) * wall_s_flux(3) &
379	-fwym(j,i) * 0.5 * &
380	( kh(k,j,i) + kh(k,j-1,i) ) * ( s(k,j,i)-s(k,j-1,i) ) &
381	+ ( 1.0 - fwym(j,i) ) * wall_s_flux(4) &
382	) * ddy2
383	ENDDO
384	ENDIF
385
386	!
387	!-- Compute vertical diffusion. In case that surface fluxes have been
388	!-- prescribed or computed at bottom and/or top, index k starts/ends at
389	!-- nzb+2 or nzt-1, respectively.
390	DO k = nzb_diff_s_inner(j,i), nzt_diff
391
392	tend(k,j,i) = tend(k,j,i) &
393	+ 0.5 * ( &
394	( kh(k,j,i) + kh(k+1,j,i) ) * ( s(k+1,j,i)-s(k,j,i) ) * ddzu(k+1) &
395	- ( kh(k,j,i) + kh(k-1,j,i) ) * ( s(k,j,i)-s(k-1,j,i) ) * ddzu(k) &
396	) * ddzw(k)
397	ENDDO
398
399	!
400	!-- Vertical diffusion at the first computational gridpoint along z-direction
401	IF ( use_surface_fluxes ) THEN
402
403	k = nzb_s_inner(j,i)+1
404
405	tend(k,j,i) = tend(k,j,i) + ( 0.5 * ( kh(k,j,i)+kh(k+1,j,i) ) &
406	* ( s(k+1,j,i)-s(k,j,i) ) &
407	* ddzu(k+1) &
408	+ s_flux_b(j,i) &
409	) * ddzw(k)
410
411	ENDIF
412
413	!
414	!-- Vertical diffusion at the last computational gridpoint along z-direction
415	IF ( use_top_fluxes ) THEN
416
417	k = nzt
418
419	tend(k,j,i) = tend(k,j,i) + ( - s_flux_t(j,i) &
420	- 0.5 * ( kh(k-1,j,i)+kh(k,j,i) ) &
421	* ( s(k,j,i)-s(k-1,j,i) ) &
422	* ddzu(k) &
423	) * ddzw(k)
424
425	ENDIF
426
427	END SUBROUTINE diffusion_s_ij
428
429	END MODULE diffusion_s_mod

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