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source: palm/trunk/SOURCE/subsidence_mod.f90 @ 4329

Last change on this file since 4329 was 4329, checked in by motisi, 5 years ago
Renamed wall_flags_0 to wall_flags_static_0
Property svn:keywords set to `Id`
File size: 13.9 KB

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1	!> @file subsidence_mod.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! 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 1997-2019 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: subsidence_mod.f90 4329 2019-12-10 15:46:36Z motisi $
27	! Renamed wall_flags_0 to wall_flags_static_0
28	!
29	! 4182 2019-08-22 15:20:23Z scharf
30	! Corrected "Former revisions" section
31	!
32	! 3655 2019-01-07 16:51:22Z knoop
33	! add subroutine and variable description
34	!
35	! Revision 3.7 2009-12-11 14:15:58Z heinze
36	! Initial revision
37	!
38	! Description:
39	! ------------
40	!> Impact of large-scale subsidence or ascent as tendency term for use
41	!> in the prognostic equation of potential temperature. This enables the
42	!> construction of a constant boundary layer height z_i with time.
43	!-----------------------------------------------------------------------------!
44	MODULE subsidence_mod
45
46
47
48	IMPLICIT NONE
49
50	PRIVATE
51	PUBLIC init_w_subsidence, subsidence
52
53	INTERFACE init_w_subsidence
54	MODULE PROCEDURE init_w_subsidence
55	END INTERFACE init_w_subsidence
56
57	INTERFACE subsidence
58	MODULE PROCEDURE subsidence
59	MODULE PROCEDURE subsidence_ij
60	END INTERFACE subsidence
61
62	CONTAINS
63
64	!------------------------------------------------------------------------------!
65	! Description:
66	! ------------
67	!> Initialize vertical subsidence velocity w_subs.
68	!------------------------------------------------------------------------------!
69	SUBROUTINE init_w_subsidence
70
71	USE arrays_3d, &
72	ONLY: dzu, w_subs, zu
73
74	USE control_parameters, &
75	ONLY: message_string, ocean_mode, subs_vertical_gradient, &
76	subs_vertical_gradient_level, subs_vertical_gradient_level_i
77
78	USE indices, &
79	ONLY: nzb, nzt
80
81	USE kinds
82
83	IMPLICIT NONE
84
85	INTEGER(iwp) :: i !< loop index
86	INTEGER(iwp) :: k !< loop index
87
88	REAL(wp) :: gradient !< vertical gradient of subsidence velocity
89	REAL(wp) :: ws_surface !< subsidence velocity at the surface
90
91	IF ( .NOT. ALLOCATED( w_subs ) ) THEN
92	ALLOCATE( w_subs(nzb:nzt+1) )
93	w_subs = 0.0_wp
94	ENDIF
95
96	IF ( ocean_mode ) THEN
97	message_string = 'applying large scale vertical motion is not ' // &
98	'allowed for ocean mode'
99	CALL message( 'init_w_subsidence', 'PA0324', 2, 2, 0, 6, 0 )
100	ENDIF
101
102	!
103	!-- Compute the profile of the subsidence/ascent velocity
104	!-- using the given gradients
105	i = 1
106	gradient = 0.0_wp
107	ws_surface = 0.0_wp
108
109
110	subs_vertical_gradient_level_i(1) = 0
111	DO k = 1, nzt+1
112	IF ( i < 11 ) THEN
113	IF ( subs_vertical_gradient_level(i) < zu(k) .AND. &
114	subs_vertical_gradient_level(i) >= 0.0_wp ) THEN
115	gradient = subs_vertical_gradient(i) / 100.0_wp
116	subs_vertical_gradient_level_i(i) = k - 1
117	i = i + 1
118	ENDIF
119	ENDIF
120	IF ( gradient /= 0.0_wp ) THEN
121	IF ( k /= 1 ) THEN
122	w_subs(k) = w_subs(k-1) + dzu(k) * gradient
123	ELSE
124	w_subs(k) = ws_surface + 0.5_wp * dzu(k) * gradient
125	ENDIF
126	ELSE
127	w_subs(k) = w_subs(k-1)
128	ENDIF
129	ENDDO
130
131	!
132	!-- In case of no given gradients for the subsidence/ascent velocity,
133	!-- choose zero gradient
134	IF ( subs_vertical_gradient_level(1) == -9999999.9_wp ) THEN
135	subs_vertical_gradient_level(1) = 0.0_wp
136	ENDIF
137
138	END SUBROUTINE init_w_subsidence
139
140
141	!------------------------------------------------------------------------------!
142	! Description:
143	! ------------
144	!> Add effect of large-scale subsidence to variable.
145	!------------------------------------------------------------------------------!
146	SUBROUTINE subsidence( tendency, var, var_init, ls_index )
147
148	USE arrays_3d, &
149	ONLY: ddzu, w_subs
150
151	USE control_parameters, &
152	ONLY: dt_3d, intermediate_timestep_count, large_scale_forcing, &
153	scalar_rayleigh_damping
154
155	USE indices, &
156	ONLY: nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nzb, nzt, &
157	wall_flags_static_0
158
159	USE kinds
160
161	USE statistics, &
162	ONLY: sums_ls_l, weight_substep
163
164	IMPLICIT NONE
165
166	INTEGER(iwp) :: i !< loop index
167	INTEGER(iwp) :: j !< loop index
168	INTEGER(iwp) :: k !< loop index
169	INTEGER(iwp) :: ls_index !< index of large-scale subsidence in sums_ls_l
170
171	REAL(wp) :: tmp_tend !< temporary tendency
172	REAL(wp) :: tmp_grad !< temporary gradient
173
174	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !< variable where to add subsidence
175	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !< tendency of var
176	REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !< initialization profile of var
177	REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !< modified profile of var
178
179	var_mod = var_init
180
181	!
182	!-- Influence of w_subsidence on the current tendency term
183	DO i = nxl, nxr
184	DO j = nys, nyn
185
186	DO k = nzb+1, nzt
187	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
188	tmp_tend = - w_subs(k) * &
189	( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1) * &
190	MERGE( 1.0_wp, 0.0_wp, &
191	BTEST( wall_flags_static_0(k,j,i), 0 ) )
192	ELSE ! large-scale ascent
193	tmp_tend = - w_subs(k) * &
194	( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) * &
195	MERGE( 1.0_wp, 0.0_wp, &
196	BTEST( wall_flags_static_0(k,j,i), 0 ) )
197	ENDIF
198
199	tendency(k,j,i) = tendency(k,j,i) + tmp_tend
200
201	IF ( large_scale_forcing ) THEN
202	sums_ls_l(k,ls_index) = sums_ls_l(k,ls_index) + tmp_tend &
203	* weight_substep(intermediate_timestep_count) &
204	* MERGE( 1.0_wp, 0.0_wp, &
205	BTEST( wall_flags_static_0(k,j,i), 0 ) )
206	ENDIF
207	ENDDO
208
209	IF ( large_scale_forcing ) THEN
210	sums_ls_l(nzt+1,ls_index) = sums_ls_l(nzt,ls_index)
211	ENDIF
212
213	ENDDO
214	ENDDO
215
216	!
217	!-- Shifting of the initial profile is especially necessary with Rayleigh
218	!-- damping switched on
219	IF ( scalar_rayleigh_damping .AND. &
220	intermediate_timestep_count == 1 ) THEN
221	DO k = nzb, nzt
222	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
223	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
224	( var_init(k+1) - var_init(k) ) * ddzu(k+1)
225	ENDIF
226	ENDDO
227	!
228	!-- At the upper boundary, the initial profile is shifted with aid of
229	!-- the gradient tmp_grad. (This is ok if the gradients are linear.)
230	IF ( w_subs(nzt) < 0.0_wp ) THEN
231	tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1)
232	var_mod(nzt+1) = var_init(nzt+1) - &
233	dt_3d * w_subs(nzt+1) * tmp_grad
234	ENDIF
235
236
237	DO k = nzt+1, nzb+1, -1
238	IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent
239	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
240	( var_init(k) - var_init(k-1) ) * ddzu(k)
241	ENDIF
242	ENDDO
243	!
244	!-- At the lower boundary shifting is not necessary because the
245	!-- subsidence velocity w_subs(nzb) vanishes.
246	IF ( w_subs(nzb+1) >= 0.0_wp ) THEN
247	var_mod(nzb) = var_init(nzb)
248	ENDIF
249
250	var_init = var_mod
251	ENDIF
252
253
254	END SUBROUTINE subsidence
255
256	!------------------------------------------------------------------------------!
257	! Description:
258	! ------------
259	!> Add effect of large-scale subsidence to variable.
260	!------------------------------------------------------------------------------!
261	SUBROUTINE subsidence_ij( i, j, tendency, var, var_init, ls_index )
262
263	USE arrays_3d, &
264	ONLY: ddzu, w_subs
265
266	USE control_parameters, &
267	ONLY: dt_3d, intermediate_timestep_count, large_scale_forcing, &
268	scalar_rayleigh_damping
269
270	USE indices, &
271	ONLY: nxl, nxlg, nxrg, nyng, nys, nysg, nzb, nzt, wall_flags_static_0
272
273	USE kinds
274
275	USE statistics, &
276	ONLY: sums_ls_l, weight_substep
277
278	IMPLICIT NONE
279
280	INTEGER(iwp) :: i !< loop variable
281	INTEGER(iwp) :: j !< loop variable
282	INTEGER(iwp) :: k !< loop variable
283	INTEGER(iwp) :: ls_index !< index of large-scale subsidence in sums_ls_l
284
285	REAL(wp) :: tmp_tend !< temporary tendency
286	REAL(wp) :: tmp_grad !< temporary gradient
287
288	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !< variable where to add subsidence
289	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !< tendency of var
290	REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !< initialization profile of var
291	REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !< modified profile of var
292
293	var_mod = var_init
294
295	!
296	!-- Influence of w_subsidence on the current tendency term
297	DO k = nzb+1, nzt
298	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
299	tmp_tend = - w_subs(k) * ( var(k+1,j,i) - var(k,j,i) ) &
300	* ddzu(k+1) &
301	* MERGE( 1.0_wp, 0.0_wp, &
302	BTEST( wall_flags_static_0(k,j,i), 0 ) )
303	ELSE ! large-scale ascent
304	tmp_tend = - w_subs(k) * ( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) &
305	* MERGE( 1.0_wp, 0.0_wp, &
306	BTEST( wall_flags_static_0(k,j,i), 0 ) )
307	ENDIF
308
309	tendency(k,j,i) = tendency(k,j,i) + tmp_tend
310
311	IF ( large_scale_forcing ) THEN
312	sums_ls_l(k,ls_index) = sums_ls_l(k,ls_index) + tmp_tend &
313	* weight_substep(intermediate_timestep_count)&
314	* MERGE( 1.0_wp, 0.0_wp, &
315	BTEST( wall_flags_static_0(k,j,i), 0 ) )
316	ENDIF
317	ENDDO
318
319	IF ( large_scale_forcing ) THEN
320	sums_ls_l(nzt+1,ls_index) = sums_ls_l(nzt,ls_index)
321	ENDIF
322
323	!
324	!-- Shifting of the initial profile is especially necessary with Rayleigh
325	!-- damping switched on
326	IF ( scalar_rayleigh_damping .AND. &
327	intermediate_timestep_count == 1 ) THEN
328	IF ( i == nxl .AND. j == nys ) THEN ! shifting only once per PE
329
330	DO k = nzb, nzt
331	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
332	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
333	( var_init(k+1) - var_init(k) ) * ddzu(k+1)
334	ENDIF
335	ENDDO
336	!
337	!-- At the upper boundary, the initial profile is shifted with aid of
338	!-- the gradient tmp_grad. (This is ok if the gradients are linear.)
339	IF ( w_subs(nzt) < 0.0_wp ) THEN
340	tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1)
341	var_mod(nzt+1) = var_init(nzt+1) - &
342	dt_3d * w_subs(nzt+1) * tmp_grad
343	ENDIF
344
345
346	DO k = nzt+1, nzb+1, -1
347	IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent
348	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
349	( var_init(k) - var_init(k-1) ) * ddzu(k)
350	ENDIF
351	ENDDO
352	!
353	!-- At the lower boundary shifting is not necessary because the
354	!-- subsidence velocity w_subs(nzb) vanishes.
355	IF ( w_subs(nzb+1) >= 0.0_wp ) THEN
356	var_mod(nzb) = var_init(nzb)
357	ENDIF
358
359	var_init = var_mod
360
361	ENDIF
362	ENDIF
363
364	END SUBROUTINE subsidence_ij
365
366
367	END MODULE subsidence_mod

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