Home

Context Navigation

source: palm/trunk/SOURCE/init_grid.f90 @ 1679

Last change on this file since 1679 was 1679, checked in by boeske, 9 years ago
Comment line corrected
Property svn:keywords set to `Id`
File size: 64.9 KB

Line
1	SUBROUTINE init_grid
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: init_grid.f90 1679 2015-10-05 11:29:24Z boeske $
27	!
28	! 1677 2015-10-02 13:25:23Z boeske
29	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
30	!
31	! 1675 2015-10-02 08:28:59Z gronemeier
32	! Bugfix: Definition of topography grid levels
33	!
34	! 1660 2015-09-21 08:15:16Z gronemeier
35	! Bugfix: Definition of topography grid levels if vertical grid stretching
36	! starts below the maximum topography height.
37	!
38	! 1580 2015-04-10 13:43:49Z suehring
39	! Bugfix: setting flags for 5th order scheme near buildings
40	!
41	! 1575 2015-03-27 09:56:27Z raasch
42	! adjustments for psolver-queries
43	!
44	! 1557 2015-03-05 16:43:04Z suehring
45	! Adjustment for monotoinic limiter
46	!
47	! 1418 2014-06-06 13:05:08Z fricke
48	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
49	! condition and a negative value for dz_stretch_level the condition
50	! was always true for the whole model domain
51	!
52	! 1409 2014-05-23 12:11:32Z suehring
53	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
54	! j <= nysv
55	!
56	! 1353 2014-04-08 15:21:23Z heinze
57	! REAL constants provided with KIND-attribute
58	!
59	! 1322 2014-03-20 16:38:49Z raasch
60	! REAL constants defined as wp-kind
61	!
62	! 1320 2014-03-20 08:40:49Z raasch
63	! ONLY-attribute added to USE-statements,
64	! kind-parameters added to all INTEGER and REAL declaration statements,
65	! kinds are defined in new module kinds,
66	! revision history before 2012 removed,
67	! comment fields (!:) to be used for variable explanations added to
68	! all variable declaration statements
69	!
70	! 1221 2013-09-10 08:59:13Z raasch
71	! wall_flags_00 introduced to hold bits 32-63,
72	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
73	! loops optimized for openACC (pres + flow_statistics)
74	!
75	! 1092 2013-02-02 11:24:22Z raasch
76	! unused variables removed
77	!
78	! 1069 2012-11-28 16:18:43Z maronga
79	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
80	! model in case of coupled runs
81	!
82	! 1036 2012-10-22 13:43:42Z raasch
83	! code put under GPL (PALM 3.9)
84	!
85	! 1015 2012-09-27 09:23:24Z raasch
86	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
87	! nzb_w_inner+1
88	!
89	! 996 2012-09-07 10:41:47Z raasch
90	! little reformatting
91	!
92	! 978 2012-08-09 08:28:32Z fricke
93	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
94	! Bugfix: Set wall_flags_0 for inflow boundary
95	!
96	! 927 2012-06-06 19:15:04Z raasch
97	! Wall flags are not set for multigrid method in case of masking method
98	!
99	! 864 2012-03-27 15:10:33Z gryschka
100	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
101	! were not correctly defined for k=1.
102	!
103	! 861 2012-03-26 14:18:34Z suehring
104	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
105	! inflow and outflow boundaries as well as near the bottom and the top of the
106	! model domain.!
107	! Initialization of nzb_s_inner and nzb_w_inner.
108	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
109	! while setting wall_flags_0
110	!
111	! 843 2012-02-29 15:16:21Z gryschka
112	! In case of ocean and dirichlet bc for u and v at the bottom
113	! the first u-level ist defined at same height as the first w-level
114	!
115	! 818 2012-02-08 16:11:23Z maronga
116	! Bugfix: topo_height is only required if topography is used. It is thus now
117	! allocated in the topography branch
118	!
119	! 809 2012-01-30 13:32:58Z maronga
120	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
121	!
122	! 807 2012-01-25 11:53:51Z maronga
123	! New cpp directive "__check" implemented which is used by check_namelist_files
124	!
125	! Revision 1.1 1997/08/11 06:17:45 raasch
126	! Initial revision (Testversion)
127	!
128	!
129	! Description:
130	! ------------
131	! Creating grid depending constants
132	!------------------------------------------------------------------------------!
133
134	USE arrays_3d, &
135	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
136	f2_mg, f3_mg, l_grid, l_wall, zu, zw
137
138	USE control_parameters, &
139	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
140	building_length_y, building_wall_left, building_wall_south, &
141	canyon_height, canyon_wall_left, canyon_wall_south, &
142	canyon_width_x, canyon_width_y, coupling_char, dp_level_ind_b, &
143	dz, dz_max, dz_stretch_factor, dz_stretch_level, &
144	dz_stretch_level_index, ibc_uv_b, io_blocks, io_group, &
145	inflow_l, inflow_n, inflow_r, inflow_s, masking_method, &
146	maximum_grid_level, message_string, momentum_advec, ocean, &
147	outflow_l, outflow_n, outflow_r, outflow_s, prandtl_layer, &
148	psolver, scalar_advec, topography, topography_grid_convention, &
149	use_surface_fluxes, use_top_fluxes, wall_adjustment_factor
150
151	USE grid_variables, &
152	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
153	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
154	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
155
156	USE indices, &
157	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
158	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
159	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
160	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
161	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
162	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
163	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
164	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
165	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
166	wall_flags_9
167
168	USE kinds
169
170	USE pegrid
171
172	IMPLICIT NONE
173
174	INTEGER(iwp) :: bh !:
175	INTEGER(iwp) :: blx !:
176	INTEGER(iwp) :: bly !:
177	INTEGER(iwp) :: bxl !:
178	INTEGER(iwp) :: bxr !:
179	INTEGER(iwp) :: byn !:
180	INTEGER(iwp) :: bys !:
181	INTEGER(iwp) :: ch !:
182	INTEGER(iwp) :: cwx !:
183	INTEGER(iwp) :: cwy !:
184	INTEGER(iwp) :: cxl !:
185	INTEGER(iwp) :: cxr !:
186	INTEGER(iwp) :: cyn !:
187	INTEGER(iwp) :: cys !:
188	INTEGER(iwp) :: gls !:
189	INTEGER(iwp) :: i !:
190	INTEGER(iwp) :: ii !:
191	INTEGER(iwp) :: inc !:
192	INTEGER(iwp) :: j !:
193	INTEGER(iwp) :: k !:
194	INTEGER(iwp) :: l !:
195	INTEGER(iwp) :: nxl_l !:
196	INTEGER(iwp) :: nxr_l !:
197	INTEGER(iwp) :: nyn_l !:
198	INTEGER(iwp) :: nys_l !:
199	INTEGER(iwp) :: nzb_si !:
200	INTEGER(iwp) :: nzt_l !:
201	INTEGER(iwp) :: vi !:
202
203	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !:
204
205	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !:
206	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !:
207	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !:
208	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !:
209	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !:
210	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !:
211	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !:
212	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !:
213	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !:
214	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !:
215
216	LOGICAL :: flag_set = .FALSE. !:
217
218	REAL(wp) :: dx_l !:
219	REAL(wp) :: dy_l !:
220	REAL(wp) :: dz_stretched !:
221
222	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !:
223
224
225	!
226	!-- Calculation of horizontal array bounds including ghost layers
227	nxlg = nxl - nbgp
228	nxrg = nxr + nbgp
229	nysg = nys - nbgp
230	nyng = nyn + nbgp
231
232	!
233	!-- Allocate grid arrays
234	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
235	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
236
237	!
238	!-- Compute height of u-levels from constant grid length and dz stretch factors
239	IF ( dz == -1.0_wp ) THEN
240	message_string = 'missing dz'
241	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
242	ELSEIF ( dz <= 0.0_wp ) THEN
243	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
244	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
245	ENDIF
246
247	!
248	!-- Define the vertical grid levels
249	IF ( .NOT. ocean ) THEN
250	!
251	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
252	!-- The second u-level (k=1) corresponds to the top of the
253	!-- Prandtl-layer.
254
255	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
256	zu(0) = 0.0_wp
257	! zu(0) = - dz * 0.5_wp
258	ELSE
259	zu(0) = - dz * 0.5_wp
260	ENDIF
261	zu(1) = dz * 0.5_wp
262
263	dz_stretch_level_index = nzt+1
264	dz_stretched = dz
265	DO k = 2, nzt+1
266	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
267	dz_stretched = dz_stretched * dz_stretch_factor
268	dz_stretched = MIN( dz_stretched, dz_max )
269	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
270	ENDIF
271	zu(k) = zu(k-1) + dz_stretched
272	ENDDO
273
274	!
275	!-- Compute the w-levels. They are always staggered half-way between the
276	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
277	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
278	!-- The top w-level is extrapolated linearly.
279	zw(0) = 0.0_wp
280	DO k = 1, nzt
281	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
282	ENDDO
283	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
284
285	ELSE
286	!
287	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
288	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
289	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
290	!-- w-level are defined at same height, but staggered from the second level.
291	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
292	zu(nzt+1) = dz * 0.5_wp
293	zu(nzt) = - dz * 0.5_wp
294
295	dz_stretch_level_index = 0
296	dz_stretched = dz
297	DO k = nzt-1, 0, -1
298	!
299	!-- The default value of dz_stretch_level is positive, thus the first
300	!-- condition is always true. Hence, the second condition is necessary.
301	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
302	.AND. dz_stretched < dz_max ) THEN
303	dz_stretched = dz_stretched * dz_stretch_factor
304	dz_stretched = MIN( dz_stretched, dz_max )
305	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
306	ENDIF
307	zu(k) = zu(k+1) - dz_stretched
308	ENDDO
309
310	!
311	!-- Compute the w-levels. They are always staggered half-way between the
312	!-- corresponding u-levels, except in case of dirichlet bc for u and v
313	!-- at the ground. In this case the first u- and w-level are defined at
314	!-- same height. The top w-level (nzt+1) is not used but set for
315	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
316	zw(nzt+1) = dz
317	zw(nzt) = 0.0_wp
318	DO k = 0, nzt
319	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
320	ENDDO
321
322	!
323	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
324	!-- at same height.
325	IF ( ibc_uv_b == 0 ) THEN
326	zu(0) = zw(0)
327	ENDIF
328
329	ENDIF
330
331	!
332	!-- Compute grid lengths.
333	DO k = 1, nzt+1
334	dzu(k) = zu(k) - zu(k-1)
335	ddzu(k) = 1.0_wp / dzu(k)
336	dzw(k) = zw(k) - zw(k-1)
337	ddzw(k) = 1.0_wp / dzw(k)
338	ENDDO
339
340	DO k = 1, nzt
341	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
342	ENDDO
343
344	!
345	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
346	!-- everywhere. For the actual grid, the grid spacing at the lowest level
347	!-- is only dz/2, but should be dz. Therefore, an additional array
348	!-- containing with appropriate grid information is created for these
349	!-- solvers.
350	IF ( psolver(1:9) /= 'multigrid' ) THEN
351	ALLOCATE( ddzu_pres(1:nzt+1) )
352	ddzu_pres = ddzu
353	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
354	ENDIF
355
356	!
357	!-- In case of multigrid method, compute grid lengths and grid factors for the
358	!-- grid levels
359	IF ( psolver(1:9) == 'multigrid' ) THEN
360
361	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
362	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
363	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
364	f1_mg(nzb+1:nzt,maximum_grid_level), &
365	f2_mg(nzb+1:nzt,maximum_grid_level), &
366	f3_mg(nzb+1:nzt,maximum_grid_level) )
367
368	dzu_mg(:,maximum_grid_level) = dzu
369	!
370	!-- Next line to ensure an equally spaced grid.
371	dzu_mg(1,maximum_grid_level) = dzu(2)
372
373	dzw_mg(:,maximum_grid_level) = dzw
374	nzt_l = nzt
375	DO l = maximum_grid_level-1, 1, -1
376	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
377	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
378	nzt_l = nzt_l / 2
379	DO k = 2, nzt_l+1
380	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
381	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
382	ENDDO
383	ENDDO
384
385	nzt_l = nzt
386	dx_l = dx
387	dy_l = dy
388	DO l = maximum_grid_level, 1, -1
389	ddx2_mg(l) = 1.0_wp / dx_l**2
390	ddy2_mg(l) = 1.0_wp / dy_l**2
391	DO k = nzb+1, nzt_l
392	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
393	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
394	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
395	f2_mg(k,l) + f3_mg(k,l)
396	ENDDO
397	nzt_l = nzt_l / 2
398	dx_l = dx_l * 2.0_wp
399	dy_l = dy_l * 2.0_wp
400	ENDDO
401
402	ENDIF
403
404	!
405	!-- Compute the reciprocal values of the horizontal grid lengths.
406	ddx = 1.0_wp / dx
407	ddy = 1.0_wp / dy
408	dx2 = dx * dx
409	dy2 = dy * dy
410	ddx2 = 1.0_wp / dx2
411	ddy2 = 1.0_wp / dy2
412
413	!
414	!-- Compute the grid-dependent mixing length.
415	DO k = 1, nzt
416	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
417	ENDDO
418
419	!
420	!-- Allocate outer and inner index arrays for topography and set
421	!-- defaults.
422	!-- nzb_local has to contain additional layers of ghost points for calculating
423	!-- the flag arrays needed for the multigrid method
424	gls = 2**( maximum_grid_level )
425	IF ( gls < nbgp ) gls = nbgp
426
427	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
428	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
429	nzb_local(-gls:ny+gls,-gls:nx+gls), &
430	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
431	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
432	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
433	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
434	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
435	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
436	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
437	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
438	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
439	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
440	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
441	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
442	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
443	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
444	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
445	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
446	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
447	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
448	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
449	nzb_2d(nysg:nyng,nxlg:nxrg), &
450	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
451	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
452	wall_e_x(nysg:nyng,nxlg:nxrg), &
453	wall_e_y(nysg:nyng,nxlg:nxrg), &
454	wall_u(nysg:nyng,nxlg:nxrg), &
455	wall_v(nysg:nyng,nxlg:nxrg), &
456	wall_w_x(nysg:nyng,nxlg:nxrg), &
457	wall_w_y(nysg:nyng,nxlg:nxrg) )
458
459
460
461	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
462
463
464	nzb_s_inner = nzb; nzb_s_outer = nzb
465	nzb_u_inner = nzb; nzb_u_outer = nzb
466	nzb_v_inner = nzb; nzb_v_outer = nzb
467	nzb_w_inner = nzb; nzb_w_outer = nzb
468
469	rflags_s_inner = 1.0_wp
470	rflags_invers = 1.0_wp
471
472	!
473	!-- Define vertical gridpoint from (or to) which on the usual finite difference
474	!-- form (which does not use surface fluxes) is applied
475	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
476	nzb_diff = nzb + 2
477	ELSE
478	nzb_diff = nzb + 1
479	ENDIF
480	IF ( use_top_fluxes ) THEN
481	nzt_diff = nzt - 1
482	ELSE
483	nzt_diff = nzt
484	ENDIF
485
486	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
487	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
488
489	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
490	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
491	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
492	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
493
494	!
495	!-- Initialize near-wall mixing length l_wall only in the vertical direction
496	!-- for the moment,
497	!-- multiplication with wall_adjustment_factor near the end of this routine
498	l_wall(nzb,:,:) = l_grid(1)
499	DO k = nzb+1, nzt
500	l_wall(k,:,:) = l_grid(k)
501	ENDDO
502	l_wall(nzt+1,:,:) = l_grid(nzt)
503
504	ALLOCATE ( vertical_influence(nzb:nzt) )
505	DO k = 1, nzt
506	vertical_influence(k) = MIN ( INT( l_grid(k) / &
507	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
508	ENDDO
509
510	DO k = 1, MAXVAL( nzb_s_inner )
511	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
512	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
513	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
514	'threshold given by only local', &
515	' &horizontal reduction of near_wall ', &
516	'mixing length l_wall', &
517	' &starting from height level k = ', k, '.'
518	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
519	EXIT
520	ENDIF
521	ENDDO
522	vertical_influence(0) = vertical_influence(1)
523
524	DO i = nxlg, nxrg
525	DO j = nysg, nyng
526	DO k = nzb_s_inner(j,i) + 1, &
527	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
528	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
529	ENDDO
530	ENDDO
531	ENDDO
532
533	!
534	!-- Set outer and inner index arrays for non-flat topography.
535	!-- Here consistency checks concerning domain size and periodicity are
536	!-- necessary.
537	!-- Within this SELECT CASE structure only nzb_local is initialized
538	!-- individually depending on the chosen topography type, all other index
539	!-- arrays are initialized further below.
540	SELECT CASE ( TRIM( topography ) )
541
542	CASE ( 'flat' )
543	!
544	!-- nzb_local is required for the multigrid solver
545	nzb_local = 0
546
547	CASE ( 'single_building' )
548	!
549	!-- Single rectangular building, by default centered in the middle of the
550	!-- total domain
551	blx = NINT( building_length_x / dx )
552	bly = NINT( building_length_y / dy )
553	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
554	IF ( ABS( zw(bh ) - building_height ) == &
555	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
556
557	IF ( building_wall_left == 9999999.9_wp ) THEN
558	building_wall_left = ( nx + 1 - blx ) / 2 * dx
559	ENDIF
560	bxl = NINT( building_wall_left / dx )
561	bxr = bxl + blx
562
563	IF ( building_wall_south == 9999999.9_wp ) THEN
564	building_wall_south = ( ny + 1 - bly ) / 2 * dy
565	ENDIF
566	bys = NINT( building_wall_south / dy )
567	byn = bys + bly
568
569	!
570	!-- Building size has to meet some requirements
571	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
572	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
573	WRITE( message_string, * ) 'inconsistent building parameters:', &
574	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
575	'byn=', byn, 'nx=', nx, 'ny=', ny
576	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
577	ENDIF
578
579	!
580	!-- Define the building.
581	nzb_local = 0
582	nzb_local(bys:byn,bxl:bxr) = bh
583
584	CASE ( 'single_street_canyon' )
585	!
586	!-- Single quasi-2D street canyon of infinite length in x or y direction.
587	!-- The canyon is centered in the other direction by default.
588	IF ( canyon_width_x /= 9999999.9_wp ) THEN
589	!
590	!-- Street canyon in y direction
591	cwx = NINT( canyon_width_x / dx )
592	IF ( canyon_wall_left == 9999999.9_wp ) THEN
593	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
594	ENDIF
595	cxl = NINT( canyon_wall_left / dx )
596	cxr = cxl + cwx
597
598	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
599	!
600	!-- Street canyon in x direction
601	cwy = NINT( canyon_width_y / dy )
602	IF ( canyon_wall_south == 9999999.9_wp ) THEN
603	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
604	ENDIF
605	cys = NINT( canyon_wall_south / dy )
606	cyn = cys + cwy
607
608	ELSE
609
610	message_string = 'no street canyon width given'
611	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
612
613	ENDIF
614
615	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
616	IF ( ABS( zw(ch ) - canyon_height ) == &
617	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
618
619	dp_level_ind_b = ch
620	!
621	!-- Street canyon size has to meet some requirements
622	IF ( canyon_width_x /= 9999999.9_wp ) THEN
623	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
624	( ch < 3 ) ) THEN
625	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
626	'&cxl=', cxl, 'cxr=', cxr, &
627	'cwx=', cwx, &
628	'ch=', ch, 'nx=', nx, 'ny=', ny
629	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
630	ENDIF
631	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
632	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
633	( ch < 3 ) ) THEN
634	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
635	'&cys=', cys, 'cyn=', cyn, &
636	'cwy=', cwy, &
637	'ch=', ch, 'nx=', nx, 'ny=', ny
638	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
639	ENDIF
640	ENDIF
641	IF ( canyon_width_x /= 9999999.9_wp .AND. &
642	canyon_width_y /= 9999999.9_wp ) THEN
643	message_string = 'inconsistent canyon parameters:' // &
644	'&street canyon can only be oriented' // &
645	'&either in x- or in y-direction'
646	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
647	ENDIF
648
649	nzb_local = ch
650	IF ( canyon_width_x /= 9999999.9_wp ) THEN
651	nzb_local(:,cxl+1:cxr-1) = 0
652	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
653	nzb_local(cys+1:cyn-1,:) = 0
654	ENDIF
655
656	CASE ( 'read_from_file' )
657
658	ALLOCATE ( topo_height(0:ny,0:nx) )
659
660	DO ii = 0, io_blocks-1
661	IF ( ii == io_group ) THEN
662
663	!
664	!-- Arbitrary irregular topography data in PALM format (exactly
665	!-- matching the grid size and total domain size)
666	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
667	FORM='FORMATTED', ERR=10 )
668	DO j = ny, 0, -1
669	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
670	ENDDO
671
672	GOTO 12
673
674	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
675	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
676
677	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
678	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
679
680	12 CLOSE( 90 )
681
682	ENDIF
683	#if defined( __parallel ) && ! defined ( __check )
684	CALL MPI_BARRIER( comm2d, ierr )
685	#endif
686	ENDDO
687
688	!
689	!-- Calculate the index height of the topography
690	DO i = 0, nx
691	DO j = 0, ny
692	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
693	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
694	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
695	nzb_local(j,i) = nzb_local(j,i) + 1
696	ENDDO
697	ENDDO
698
699	DEALLOCATE ( topo_height )
700	!
701	!-- Add cyclic boundaries (additional layers are for calculating
702	!-- flag arrays needed for the multigrid sover)
703	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
704	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
705	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
706	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
707
708	CASE DEFAULT
709	!
710	!-- The DEFAULT case is reached either if the parameter topography
711	!-- contains a wrong character string or if the user has defined a special
712	!-- case in the user interface. There, the subroutine user_init_grid
713	!-- checks which of these two conditions applies.
714	CALL user_init_grid( gls, nzb_local )
715
716	END SELECT
717	!
718	!-- Determine the maximum level of topography. Furthermore it is used for
719	!-- steering the degradation of order of the applied advection scheme.
720	!-- In case of non-cyclic lateral boundaries, the order of the advection
721	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
722	nzb_max = MAXVAL( nzb_local ) + 1
723	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
724	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
725	nzb_max = nzt
726	ENDIF
727
728	!
729	!-- Consistency checks and index array initialization are only required for
730	!-- non-flat topography, also the initialization of topography height arrays
731	!-- zu_s_inner and zw_w_inner
732	IF ( TRIM( topography ) /= 'flat' ) THEN
733
734	!
735	!-- Consistency checks
736	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
737	WRITE( message_string, * ) 'nzb_local values are outside the', &
738	'model domain', &
739	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
740	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
741	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
742	ENDIF
743
744	IF ( bc_lr == 'cyclic' ) THEN
745	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
746	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
747	message_string = 'nzb_local does not fulfill cyclic' // &
748	' boundary condition in x-direction'
749	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
750	ENDIF
751	ENDIF
752	IF ( bc_ns == 'cyclic' ) THEN
753	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
754	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
755	message_string = 'nzb_local does not fulfill cyclic' // &
756	' boundary condition in y-direction'
757	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
758	ENDIF
759	ENDIF
760
761	IF ( topography_grid_convention == 'cell_edge' ) THEN
762	!
763	!-- The array nzb_local as defined using the 'cell_edge' convention
764	!-- describes the actual total size of topography which is defined at the
765	!-- cell edges where u=0 on the topography walls in x-direction and v=0
766	!-- on the topography walls in y-direction. However, PALM uses individual
767	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
768	!-- Therefore, the extent of topography in nzb_local is now reduced by
769	!-- 1dx at the E topography walls and by 1dy at the N topography walls
770	!-- to form the basis for nzb_s_inner.
771	DO j = -gls, ny + gls
772	DO i = -gls, nx
773	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
774	ENDDO
775	ENDDO
776	!-- apply cyclic boundary conditions in x-direction
777	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
778	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
779	DO i = -gls, nx + gls
780	DO j = -gls, ny
781	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
782	ENDDO
783	ENDDO
784	!-- apply cyclic boundary conditions in y-direction
785	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
786	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
787	ENDIF
788
789	!
790	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
791	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
792	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
793
794	!
795	!-- Initialize remaining index arrays:
796	!-- first pre-initialize them with nzb_s_inner...
797	nzb_u_inner = nzb_s_inner
798	nzb_u_outer = nzb_s_inner
799	nzb_v_inner = nzb_s_inner
800	nzb_v_outer = nzb_s_inner
801	nzb_w_outer = nzb_s_inner
802	nzb_s_outer = nzb_s_inner
803
804	!
805	!-- ...then extend pre-initialized arrays in their according directions
806	!-- based on nzb_local using nzb_tmp as a temporary global index array
807
808	!
809	!-- nzb_s_outer:
810	!-- extend nzb_local east-/westwards first, then north-/southwards
811	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
812	DO j = -1, ny + 1
813	DO i = 0, nx
814	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
815	nzb_local(j,i+1) )
816	ENDDO
817	ENDDO
818	DO i = nxl, nxr
819	DO j = nys, nyn
820	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
821	nzb_tmp(j+1,i) )
822	ENDDO
823	!
824	!-- non-cyclic boundary conditions (overwritten by call of
825	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
826	IF ( nys == 0 ) THEN
827	j = -1
828	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
829	ENDIF
830	IF ( nys == ny ) THEN
831	j = ny + 1
832	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
833	ENDIF
834	ENDDO
835	!
836	!-- nzb_w_outer:
837	!-- identical to nzb_s_outer
838	nzb_w_outer = nzb_s_outer
839
840	!
841	!-- nzb_u_inner:
842	!-- extend nzb_local rightwards only
843	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
844	DO j = -1, ny + 1
845	DO i = 0, nx + 1
846	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
847	ENDDO
848	ENDDO
849	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
850
851	!
852	!-- nzb_u_outer:
853	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
854	DO i = nxl, nxr
855	DO j = nys, nyn
856	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
857	nzb_tmp(j+1,i) )
858	ENDDO
859	!
860	!-- non-cyclic boundary conditions (overwritten by call of
861	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
862	IF ( nys == 0 ) THEN
863	j = -1
864	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
865	ENDIF
866	IF ( nys == ny ) THEN
867	j = ny + 1
868	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
869	ENDIF
870	ENDDO
871
872	!
873	!-- nzb_v_inner:
874	!-- extend nzb_local northwards only
875	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
876	DO i = -1, nx + 1
877	DO j = 0, ny + 1
878	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
879	ENDDO
880	ENDDO
881	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
882
883	!
884	!-- nzb_v_outer:
885	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
886	DO j = nys, nyn
887	DO i = nxl, nxr
888	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
889	nzb_tmp(j,i+1) )
890	ENDDO
891	!
892	!-- non-cyclic boundary conditions (overwritten by call of
893	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
894	IF ( nxl == 0 ) THEN
895	i = -1
896	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
897	ENDIF
898	IF ( nxr == nx ) THEN
899	i = nx + 1
900	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
901	ENDIF
902	ENDDO
903	#if ! defined ( __check )
904	!
905	!-- Exchange of lateral boundary values (parallel computers) and cyclic
906	!-- boundary conditions, if applicable.
907	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
908	!-- they do not require exchange and are not included here.
909	CALL exchange_horiz_2d_int( nzb_u_inner )
910	CALL exchange_horiz_2d_int( nzb_u_outer )
911	CALL exchange_horiz_2d_int( nzb_v_inner )
912	CALL exchange_horiz_2d_int( nzb_v_outer )
913	CALL exchange_horiz_2d_int( nzb_w_outer )
914	CALL exchange_horiz_2d_int( nzb_s_outer )
915
916	!
917	!-- Allocate and set the arrays containing the topography height
918	IF ( myid == 0 ) THEN
919
920	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
921
922	DO i = 0, nx + 1
923	DO j = 0, ny + 1
924	zu_s_inner(i,j) = zu(nzb_local(j,i))
925	zw_w_inner(i,j) = zw(nzb_local(j,i))
926	ENDDO
927	ENDDO
928
929	ENDIF
930	!
931	!-- Set flag arrays to be used for masking of grid points
932	DO i = nxlg, nxrg
933	DO j = nysg, nyng
934	DO k = nzb, nzt+1
935	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
936	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
937	ENDDO
938	ENDDO
939	ENDDO
940	#endif
941	ENDIF
942
943	#if ! defined ( __check )
944	!
945	!-- Preliminary: to be removed after completion of the topography code!
946	!-- Set the former default k index arrays nzb_2d
947	nzb_2d = nzb
948
949	!
950	!-- Set the individual index arrays which define the k index from which on
951	!-- the usual finite difference form (which does not use surface fluxes) is
952	!-- applied
953	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
954	nzb_diff_u = nzb_u_inner + 2
955	nzb_diff_v = nzb_v_inner + 2
956	nzb_diff_s_inner = nzb_s_inner + 2
957	nzb_diff_s_outer = nzb_s_outer + 2
958	ELSE
959	nzb_diff_u = nzb_u_inner + 1
960	nzb_diff_v = nzb_v_inner + 1
961	nzb_diff_s_inner = nzb_s_inner + 1
962	nzb_diff_s_outer = nzb_s_outer + 1
963	ENDIF
964
965	!
966	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
967	!-- for limitation of near-wall mixing length l_wall further below
968	corner_nl = 0
969	corner_nr = 0
970	corner_sl = 0
971	corner_sr = 0
972	wall_l = 0
973	wall_n = 0
974	wall_r = 0
975	wall_s = 0
976
977	DO i = nxl, nxr
978	DO j = nys, nyn
979	!
980	!-- u-component
981	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
982	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
983	fym(j,i) = 0.0_wp
984	fyp(j,i) = 1.0_wp
985	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
986	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
987	fym(j,i) = 1.0_wp
988	fyp(j,i) = 0.0_wp
989	ENDIF
990	!
991	!-- v-component
992	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
993	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
994	fxm(j,i) = 0.0_wp
995	fxp(j,i) = 1.0_wp
996	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
997	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
998	fxm(j,i) = 1.0_wp
999	fxp(j,i) = 0.0_wp
1000	ENDIF
1001	!
1002	!-- w-component, also used for scalars, separate arrays for shear
1003	!-- production of tke
1004	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1005	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1006	wall_w_y(j,i) = 1.0_wp
1007	fwym(j,i) = 0.0_wp
1008	fwyp(j,i) = 1.0_wp
1009	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1010	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1011	wall_w_y(j,i) = 1.0_wp
1012	fwym(j,i) = 1.0_wp
1013	fwyp(j,i) = 0.0_wp
1014	ENDIF
1015	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1016	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1017	wall_w_x(j,i) = 1.0_wp
1018	fwxm(j,i) = 0.0_wp
1019	fwxp(j,i) = 1.0_wp
1020	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1021	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1022	wall_w_x(j,i) = 1.0_wp
1023	fwxm(j,i) = 1.0_wp
1024	fwxp(j,i) = 0.0_wp
1025	ENDIF
1026	!
1027	!-- Wall and corner locations inside buildings for limitation of
1028	!-- near-wall mixing length l_wall
1029	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1030
1031	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1032
1033	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1034	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1035	nzb_s_inner(j,i-1) ) + 1
1036	ENDIF
1037
1038	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1039	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1040	nzb_s_inner(j,i+1) ) + 1
1041	ENDIF
1042
1043	ENDIF
1044
1045	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1046
1047	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1048	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1049	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1050	nzb_s_inner(j,i-1) ) + 1
1051	ENDIF
1052
1053	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1054	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1055	nzb_s_inner(j,i+1) ) + 1
1056	ENDIF
1057
1058	ENDIF
1059
1060	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1061	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1062	ENDIF
1063
1064	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1065	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1066	ENDIF
1067
1068	ENDDO
1069	ENDDO
1070
1071	!
1072	!-- Calculate wall flag arrays for the multigrid method
1073	IF ( psolver(1:9) == 'multigrid' ) THEN
1074	!
1075	!-- Gridpoint increment of the current level
1076	inc = 1
1077
1078	DO l = maximum_grid_level, 1 , -1
1079
1080	nxl_l = nxl_mg(l)
1081	nxr_l = nxr_mg(l)
1082	nys_l = nys_mg(l)
1083	nyn_l = nyn_mg(l)
1084	nzt_l = nzt_mg(l)
1085
1086	!
1087	!-- Assign the flag level to be calculated
1088	SELECT CASE ( l )
1089	CASE ( 1 )
1090	flags => wall_flags_1
1091	CASE ( 2 )
1092	flags => wall_flags_2
1093	CASE ( 3 )
1094	flags => wall_flags_3
1095	CASE ( 4 )
1096	flags => wall_flags_4
1097	CASE ( 5 )
1098	flags => wall_flags_5
1099	CASE ( 6 )
1100	flags => wall_flags_6
1101	CASE ( 7 )
1102	flags => wall_flags_7
1103	CASE ( 8 )
1104	flags => wall_flags_8
1105	CASE ( 9 )
1106	flags => wall_flags_9
1107	CASE ( 10 )
1108	flags => wall_flags_10
1109	END SELECT
1110
1111	!
1112	!-- Depending on the grid level, set the respective bits in case of
1113	!-- neighbouring walls
1114	!-- Bit 0: wall to the bottom
1115	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1116	!-- Bit 2: wall to the south
1117	!-- Bit 3: wall to the north
1118	!-- Bit 4: wall to the left
1119	!-- Bit 5: wall to the right
1120	!-- Bit 6: inside building
1121
1122	flags = 0
1123
1124	!
1125	!-- In case of masking method, flags are not set and multigrid method
1126	!-- works like FFT-solver
1127	IF ( .NOT. masking_method ) THEN
1128
1129	DO i = nxl_l-1, nxr_l+1
1130	DO j = nys_l-1, nyn_l+1
1131	DO k = nzb, nzt_l+1
1132
1133	!
1134	!-- Inside/outside building (inside building does not need
1135	!-- further tests for walls)
1136	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1137
1138	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1139
1140	ELSE
1141	!
1142	!-- Bottom wall
1143	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1144	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1145	ENDIF
1146	!
1147	!-- South wall
1148	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1149	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1150	ENDIF
1151	!
1152	!-- North wall
1153	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1154	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1155	ENDIF
1156	!
1157	!-- Left wall
1158	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1159	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1160	ENDIF
1161	!
1162	!-- Right wall
1163	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1164	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1165	ENDIF
1166
1167	ENDIF
1168
1169	ENDDO
1170	ENDDO
1171	ENDDO
1172
1173	ENDIF
1174
1175	!
1176	!-- Test output of flag arrays
1177	! i = nxl_l
1178	! WRITE (9,*) ' '
1179	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1180	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1181	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1182	! DO k = nzt_l+1, nzb, -1
1183	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1184	! ENDDO
1185
1186	inc = inc * 2
1187
1188	ENDDO
1189
1190	ENDIF
1191	!
1192	!-- Allocate flags needed for masking walls.
1193	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1194	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1195	wall_flags_0 = 0
1196	wall_flags_00 = 0
1197
1198	IF ( scalar_advec == 'ws-scheme' .OR. &
1199	scalar_advec == 'ws-scheme-mono' ) THEN
1200	!
1201	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1202	!-- near topography, inflow- and outflow boundaries as well as bottom and
1203	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1204	!-- grid points.
1205	DO i = nxl, nxr
1206	DO j = nys, nyn
1207	DO k = nzb_s_inner(j,i)+1, nzt
1208	!
1209	!-- scalar - x-direction
1210	!-- WS1 (0), WS3 (1), WS5 (2)
1211	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1212	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1213	.AND. i == nxr ) ) THEN
1214	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1215	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1216	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1217	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1218	) THEN
1219	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1220	ELSE
1221	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1222	ENDIF
1223	!
1224	!-- scalar - y-direction
1225	!-- WS1 (3), WS3 (4), WS5 (5)
1226	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1227	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1228	.AND. j == nyn ) ) THEN
1229	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1230	!-- WS3
1231	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1232	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1233	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1234	) THEN
1235	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1236	!-- WS5
1237	ELSE
1238	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1239	ENDIF
1240	!
1241	!-- scalar - z-direction
1242	!-- WS1 (6), WS3 (7), WS5 (8)
1243	flag_set = .FALSE.
1244	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1245	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1246	flag_set = .TRUE.
1247	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1248	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1249	flag_set = .TRUE.
1250	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1251	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1252	ENDIF
1253	ENDDO
1254	ENDDO
1255	ENDDO
1256	ENDIF
1257
1258	IF ( momentum_advec == 'ws-scheme' ) THEN
1259	!
1260	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1261	!-- near topography, inflow- and outflow boundaries as well as bottom and
1262	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1263	!-- grid points.
1264	DO i = nxl, nxr
1265	DO j = nys, nyn
1266	DO k = nzb+1, nzt
1267	!
1268	!-- At first, set flags to WS1.
1269	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1270	!-- in order to handle the left/south flux.
1271	!-- near vertical walls.
1272	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1273	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1274	!
1275	!-- u component - x-direction
1276	!-- WS1 (9), WS3 (10), WS5 (11)
1277	IF ( k <= nzb_u_inner(j,i+1) &
1278	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
1279	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
1280	) THEN
1281	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1282	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1283	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
1284	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
1285	) THEN
1286	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1287	!
1288	!-- Clear flag for WS1
1289	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1290	ELSE
1291	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1292	!
1293	!-- Clear flag for WS1
1294	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1295	ENDIF
1296	!
1297	!-- u component - y-direction
1298	!-- WS1 (12), WS3 (13), WS5 (14)
1299	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1300	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1301	.AND. j == nyn ) ) THEN
1302	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1303	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1304	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1305	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1306	) THEN
1307	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1308	!
1309	!-- Clear flag for WS1
1310	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1311	ELSE
1312	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1313	!
1314	!-- Clear flag for WS1
1315	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1316	ENDIF
1317	!
1318	!-- u component - z-direction
1319	!-- WS1 (15), WS3 (16), WS5 (17)
1320	flag_set = .FALSE.
1321	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1322	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1323	flag_set = .TRUE.
1324	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1325	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1326	flag_set = .TRUE.
1327	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1328	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1329	ENDIF
1330
1331	ENDDO
1332	ENDDO
1333	ENDDO
1334
1335	DO i = nxl, nxr
1336	DO j = nys, nyn
1337	DO k = nzb+1, nzt
1338	!
1339	!-- At first, set flags to WS1.
1340	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1341	!-- in order to handle the left/south flux.
1342	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1343	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1344	!
1345	!-- v component - x-direction
1346	!-- WS1 (18), WS3 (19), WS5 (20)
1347	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1348	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
1349	.AND. i == nxr ) ) THEN
1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1351	!-- WS3
1352	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1353	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1354	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1355	) THEN
1356	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1357	!
1358	!-- Clear flag for WS1
1359	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1360	ELSE
1361	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1362	!
1363	!-- Clear flag for WS1
1364	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1365	ENDIF
1366	!
1367	!-- v component - y-direction
1368	!-- WS1 (21), WS3 (22), WS5 (23)
1369	IF ( k <= nzb_v_inner(j+1,i) &
1370	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
1371	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
1372	) THEN
1373	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1374	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1375	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
1376	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
1377	) THEN
1378	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1379	!
1380	!-- Clear flag for WS1
1381	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1382	ELSE
1383	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1384	!
1385	!-- Clear flag for WS1
1386	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1387	ENDIF
1388	!
1389	!-- v component - z-direction
1390	!-- WS1 (24), WS3 (25), WS5 (26)
1391	flag_set = .FALSE.
1392	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1393	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1394	flag_set = .TRUE.
1395	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1396	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1397	flag_set = .TRUE.
1398	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1399	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1400	ENDIF
1401
1402	ENDDO
1403	ENDDO
1404	ENDDO
1405	DO i = nxl, nxr
1406	DO j = nys, nyn
1407	DO k = nzb+1, nzt
1408	!
1409	!-- At first, set flags to WS1.
1410	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1411	!-- in order to handle the left/south flux.
1412	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1413	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1414	!
1415	!-- w component - x-direction
1416	!-- WS1 (27), WS3 (28), WS5 (29)
1417	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1418	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1419	.AND. i == nxr ) ) THEN
1420	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1421	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1422	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1423	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1424	) THEN
1425	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1426	!
1427	!-- Clear flag for WS1
1428	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1429	ELSE
1430	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1431	!
1432	!-- Clear flag for WS1
1433	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1434	ENDIF
1435	!
1436	!-- w component - y-direction
1437	!-- WS1 (30), WS3 (31), WS5 (32)
1438	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1439	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1440	.AND. j == nyn ) ) THEN
1441	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1442	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1443	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1444	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1445	) THEN
1446	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1447	!
1448	!-- Clear flag for WS1
1449	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1450	ELSE
1451	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1452	!
1453	!-- Clear flag for WS1
1454	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1455	ENDIF
1456	!
1457	!-- w component - z-direction
1458	!-- WS1 (33), WS3 (34), WS5 (35)
1459	flag_set = .FALSE.
1460	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1461	.OR. k == nzt ) THEN
1462	!
1463	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1464	!-- set, although this is not a prognostic level. However,
1465	!-- contrary to the advection of u,v and s this is necessary
1466	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1467	!-- at k == nzb_w_inner(j,i)+1.
1468	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1469	flag_set = .TRUE.
1470	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1471	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1472	flag_set = .TRUE.
1473	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1474	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1475	ENDIF
1476
1477	ENDDO
1478	ENDDO
1479	ENDDO
1480
1481	ENDIF
1482
1483	!
1484	!-- Exchange 3D integer wall_flags.
1485	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1486	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1487	!
1488	!-- Exchange ghost points for advection flags
1489	CALL exchange_horiz_int( wall_flags_0, nbgp )
1490	CALL exchange_horiz_int( wall_flags_00, nbgp )
1491	!
1492	!-- Set boundary flags at inflow and outflow boundary in case of
1493	!-- non-cyclic boundary conditions.
1494	IF ( inflow_l .OR. outflow_l ) THEN
1495	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1496	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1497	ENDIF
1498
1499	IF ( inflow_r .OR. outflow_r ) THEN
1500	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1501	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1502	ENDIF
1503
1504	IF ( inflow_n .OR. outflow_n ) THEN
1505	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1506	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1507	ENDIF
1508
1509	IF ( inflow_s .OR. outflow_s ) THEN
1510	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1511	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1512	ENDIF
1513
1514	ENDIF
1515
1516	!
1517	!-- In case of topography: limit near-wall mixing length l_wall further:
1518	!-- Go through all points of the subdomain one by one and look for the closest
1519	!-- surface
1520	IF ( TRIM(topography) /= 'flat' ) THEN
1521	DO i = nxl, nxr
1522	DO j = nys, nyn
1523
1524	nzb_si = nzb_s_inner(j,i)
1525	vi = vertical_influence(nzb_si)
1526
1527	IF ( wall_n(j,i) > 0 ) THEN
1528	!
1529	!-- North wall (y distance)
1530	DO k = wall_n(j,i), nzb_si
1531	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1532	ENDDO
1533	!
1534	!-- Above North wall (yz distance)
1535	DO k = nzb_si + 1, nzb_si + vi
1536	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1537	SQRT( 0.25_wp * dy**2 + &
1538	( zu(k) - zw(nzb_si) )**2 ) )
1539	ENDDO
1540	!
1541	!-- Northleft corner (xy distance)
1542	IF ( corner_nl(j,i) > 0 ) THEN
1543	DO k = corner_nl(j,i), nzb_si
1544	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1545	0.5_wp * SQRT( dx2 + dy2 ) )
1546	ENDDO
1547	!
1548	!-- Above Northleft corner (xyz distance)
1549	DO k = nzb_si + 1, nzb_si + vi
1550	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1551	SQRT( 0.25_wp * (dx2 + dy2) + &
1552	( zu(k) - zw(nzb_si) )**2 ) )
1553	ENDDO
1554	ENDIF
1555	!
1556	!-- Northright corner (xy distance)
1557	IF ( corner_nr(j,i) > 0 ) THEN
1558	DO k = corner_nr(j,i), nzb_si
1559	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1560	0.5_wp * SQRT( dx2 + dy2 ) )
1561	ENDDO
1562	!
1563	!-- Above northright corner (xyz distance)
1564	DO k = nzb_si + 1, nzb_si + vi
1565	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1566	SQRT( 0.25_wp * (dx2 + dy2) + &
1567	( zu(k) - zw(nzb_si) )**2 ) )
1568	ENDDO
1569	ENDIF
1570	ENDIF
1571
1572	IF ( wall_s(j,i) > 0 ) THEN
1573	!
1574	!-- South wall (y distance)
1575	DO k = wall_s(j,i), nzb_si
1576	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1577	ENDDO
1578	!
1579	!-- Above south wall (yz distance)
1580	DO k = nzb_si + 1, nzb_si + vi
1581	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1582	SQRT( 0.25_wp * dy**2 + &
1583	( zu(k) - zw(nzb_si) )**2 ) )
1584	ENDDO
1585	!
1586	!-- Southleft corner (xy distance)
1587	IF ( corner_sl(j,i) > 0 ) THEN
1588	DO k = corner_sl(j,i), nzb_si
1589	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1590	0.5_wp * SQRT( dx2 + dy2 ) )
1591	ENDDO
1592	!
1593	!-- Above southleft corner (xyz distance)
1594	DO k = nzb_si + 1, nzb_si + vi
1595	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1596	SQRT( 0.25_wp * (dx2 + dy2) + &
1597	( zu(k) - zw(nzb_si) )**2 ) )
1598	ENDDO
1599	ENDIF
1600	!
1601	!-- Southright corner (xy distance)
1602	IF ( corner_sr(j,i) > 0 ) THEN
1603	DO k = corner_sr(j,i), nzb_si
1604	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1605	0.5_wp * SQRT( dx2 + dy2 ) )
1606	ENDDO
1607	!
1608	!-- Above southright corner (xyz distance)
1609	DO k = nzb_si + 1, nzb_si + vi
1610	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1611	SQRT( 0.25_wp * (dx2 + dy2) + &
1612	( zu(k) - zw(nzb_si) )**2 ) )
1613	ENDDO
1614	ENDIF
1615
1616	ENDIF
1617
1618	IF ( wall_l(j,i) > 0 ) THEN
1619	!
1620	!-- Left wall (x distance)
1621	DO k = wall_l(j,i), nzb_si
1622	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1623	ENDDO
1624	!
1625	!-- Above left wall (xz distance)
1626	DO k = nzb_si + 1, nzb_si + vi
1627	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1628	SQRT( 0.25_wp * dx**2 + &
1629	( zu(k) - zw(nzb_si) )**2 ) )
1630	ENDDO
1631	ENDIF
1632
1633	IF ( wall_r(j,i) > 0 ) THEN
1634	!
1635	!-- Right wall (x distance)
1636	DO k = wall_r(j,i), nzb_si
1637	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1638	ENDDO
1639	!
1640	!-- Above right wall (xz distance)
1641	DO k = nzb_si + 1, nzb_si + vi
1642	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1643	SQRT( 0.25_wp * dx**2 + &
1644	( zu(k) - zw(nzb_si) )**2 ) )
1645	ENDDO
1646
1647	ENDIF
1648
1649	ENDDO
1650	ENDDO
1651
1652	ENDIF
1653
1654	!
1655	!-- Multiplication with wall_adjustment_factor
1656	l_wall = wall_adjustment_factor * l_wall
1657
1658	!
1659	!-- Set lateral boundary conditions for l_wall
1660	CALL exchange_horiz( l_wall, nbgp )
1661
1662	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1663	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1664
1665	#endif
1666
1667	END SUBROUTINE init_grid

Note: See TracBrowser for help on using the repository browser.

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |