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source: palm/trunk/SOURCE/init_grid.f90 @ 1411

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

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