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source: palm/trunk/SOURCE/init_grid.f90 @ 1579

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

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