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source: palm/trunk/SOURCE/init_grid.f90 @ 1362

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

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