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source: palm/trunk/SOURCE/init_grid.f90 @ 1674

Last change on this file since 1674 was 1662, checked in by gronemeier, 9 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 1662 2015-09-21 08:19:00Z raasch $
27	!
28	! 1660 2015-09-21 08:15:16Z gronemeier
29	! Bugfix: Definition of topography grid levels if vertical grid stretching
30	! starts below the maximum topography height.
31	!
32	! 1580 2015-04-10 13:43:49Z suehring
33	! Bugfix: setting flags for 5th order scheme near buildings
34	!
35	! 1575 2015-03-27 09:56:27Z raasch
36	! adjustments for psolver-queries
37	!
38	! 1557 2015-03-05 16:43:04Z suehring
39	! Adjustment for monotoinic limiter
40	!
41	! 1418 2014-06-06 13:05:08Z fricke
42	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
43	! condition and a negative value for dz_stretch_level the condition
44	! was always true for the whole model domain
45	!
46	! 1409 2014-05-23 12:11:32Z suehring
47	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
48	! j <= nysv
49	!
50	! 1353 2014-04-08 15:21:23Z heinze
51	! REAL constants provided with KIND-attribute
52	!
53	! 1322 2014-03-20 16:38:49Z raasch
54	! REAL constants defined as wp-kind
55	!
56	! 1320 2014-03-20 08:40:49Z raasch
57	! ONLY-attribute added to USE-statements,
58	! kind-parameters added to all INTEGER and REAL declaration statements,
59	! kinds are defined in new module kinds,
60	! revision history before 2012 removed,
61	! comment fields (!:) to be used for variable explanations added to
62	! all variable declaration statements
63	!
64	! 1221 2013-09-10 08:59:13Z raasch
65	! wall_flags_00 introduced to hold bits 32-63,
66	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
67	! loops optimized for openACC (pres + flow_statistics)
68	!
69	! 1092 2013-02-02 11:24:22Z raasch
70	! unused variables removed
71	!
72	! 1069 2012-11-28 16:18:43Z maronga
73	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
74	! model in case of coupled runs
75	!
76	! 1036 2012-10-22 13:43:42Z raasch
77	! code put under GPL (PALM 3.9)
78	!
79	! 1015 2012-09-27 09:23:24Z raasch
80	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
81	! nzb_w_inner+1
82	!
83	! 996 2012-09-07 10:41:47Z raasch
84	! little reformatting
85	!
86	! 978 2012-08-09 08:28:32Z fricke
87	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
88	! Bugfix: Set wall_flags_0 for inflow boundary
89	!
90	! 927 2012-06-06 19:15:04Z raasch
91	! Wall flags are not set for multigrid method in case of masking method
92	!
93	! 864 2012-03-27 15:10:33Z gryschka
94	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
95	! were not correctly defined for k=1.
96	!
97	! 861 2012-03-26 14:18:34Z suehring
98	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
99	! inflow and outflow boundaries as well as near the bottom and the top of the
100	! model domain.!
101	! Initialization of nzb_s_inner and nzb_w_inner.
102	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
103	! while setting wall_flags_0
104	!
105	! 843 2012-02-29 15:16:21Z gryschka
106	! In case of ocean and dirichlet bc for u and v at the bottom
107	! the first u-level ist defined at same height as the first w-level
108	!
109	! 818 2012-02-08 16:11:23Z maronga
110	! Bugfix: topo_height is only required if topography is used. It is thus now
111	! allocated in the topography branch
112	!
113	! 809 2012-01-30 13:32:58Z maronga
114	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
115	!
116	! 807 2012-01-25 11:53:51Z maronga
117	! New cpp directive "__check" implemented which is used by check_namelist_files
118	!
119	! Revision 1.1 1997/08/11 06:17:45 raasch
120	! Initial revision (Testversion)
121	!
122	!
123	! Description:
124	! ------------
125	! Creating grid depending constants
126	!------------------------------------------------------------------------------!
127
128	USE arrays_3d, &
129	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
130	f2_mg, f3_mg, l_grid, l_wall, zu, zw
131
132	USE control_parameters, &
133	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
134	building_length_y, building_wall_left, building_wall_south, &
135	canyon_height, canyon_wall_left, canyon_wall_south, &
136	canyon_width_x, canyon_width_y, coupling_char, dp_level_ind_b, &
137	dz, dz_max, dz_stretch_factor, dz_stretch_level, &
138	dz_stretch_level_index, ibc_uv_b, io_blocks, io_group, &
139	inflow_l, inflow_n, inflow_r, inflow_s, masking_method, &
140	maximum_grid_level, message_string, momentum_advec, ocean, &
141	outflow_l, outflow_n, outflow_r, outflow_s, prandtl_layer, &
142	psolver, scalar_advec, topography, topography_grid_convention, &
143	use_surface_fluxes, use_top_fluxes, wall_adjustment_factor
144
145	USE grid_variables, &
146	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
147	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
148	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
149
150	USE indices, &
151	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
152	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
153	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
154	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
155	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
156	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
157	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
158	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
159	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
160	wall_flags_9
161
162	USE kinds
163
164	USE pegrid
165
166	IMPLICIT NONE
167
168	INTEGER(iwp) :: bh !:
169	INTEGER(iwp) :: blx !:
170	INTEGER(iwp) :: bly !:
171	INTEGER(iwp) :: bxl !:
172	INTEGER(iwp) :: bxr !:
173	INTEGER(iwp) :: byn !:
174	INTEGER(iwp) :: bys !:
175	INTEGER(iwp) :: ch !:
176	INTEGER(iwp) :: cwx !:
177	INTEGER(iwp) :: cwy !:
178	INTEGER(iwp) :: cxl !:
179	INTEGER(iwp) :: cxr !:
180	INTEGER(iwp) :: cyn !:
181	INTEGER(iwp) :: cys !:
182	INTEGER(iwp) :: gls !:
183	INTEGER(iwp) :: i !:
184	INTEGER(iwp) :: ii !:
185	INTEGER(iwp) :: inc !:
186	INTEGER(iwp) :: j !:
187	INTEGER(iwp) :: k !:
188	INTEGER(iwp) :: l !:
189	INTEGER(iwp) :: nxl_l !:
190	INTEGER(iwp) :: nxr_l !:
191	INTEGER(iwp) :: nyn_l !:
192	INTEGER(iwp) :: nys_l !:
193	INTEGER(iwp) :: nzb_si !:
194	INTEGER(iwp) :: nzt_l !:
195	INTEGER(iwp) :: vi !:
196
197	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !:
198
199	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !:
200	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !:
201	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !:
202	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !:
203	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !:
204	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !:
205	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !:
206	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !:
207	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !:
208	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !:
209
210	LOGICAL :: flag_set = .FALSE. !:
211
212	REAL(wp) :: dx_l !:
213	REAL(wp) :: dy_l !:
214	REAL(wp) :: dz_stretched !:
215
216	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !:
217
218
219	!
220	!-- Calculation of horizontal array bounds including ghost layers
221	nxlg = nxl - nbgp
222	nxrg = nxr + nbgp
223	nysg = nys - nbgp
224	nyng = nyn + nbgp
225
226	!
227	!-- Allocate grid arrays
228	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
229	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
230
231	!
232	!-- Compute height of u-levels from constant grid length and dz stretch factors
233	IF ( dz == -1.0_wp ) THEN
234	message_string = 'missing dz'
235	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
236	ELSEIF ( dz <= 0.0_wp ) THEN
237	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
238	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
239	ENDIF
240
241	!
242	!-- Define the vertical grid levels
243	IF ( .NOT. ocean ) THEN
244	!
245	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
246	!-- The second u-level (k=1) corresponds to the top of the
247	!-- Prandtl-layer.
248
249	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
250	zu(0) = 0.0_wp
251	! zu(0) = - dz * 0.5_wp
252	ELSE
253	zu(0) = - dz * 0.5_wp
254	ENDIF
255	zu(1) = dz * 0.5_wp
256
257	dz_stretch_level_index = nzt+1
258	dz_stretched = dz
259	DO k = 2, nzt+1
260	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
261	dz_stretched = dz_stretched * dz_stretch_factor
262	dz_stretched = MIN( dz_stretched, dz_max )
263	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
264	ENDIF
265	zu(k) = zu(k-1) + dz_stretched
266	ENDDO
267
268	!
269	!-- Compute the w-levels. They are always staggered half-way between the
270	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
271	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
272	!-- The top w-level is extrapolated linearly.
273	zw(0) = 0.0_wp
274	DO k = 1, nzt
275	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
276	ENDDO
277	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
278
279	ELSE
280	!
281	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
282	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
283	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
284	!-- w-level are defined at same height, but staggered from the second level.
285	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
286	zu(nzt+1) = dz * 0.5_wp
287	zu(nzt) = - dz * 0.5_wp
288
289	dz_stretch_level_index = 0
290	dz_stretched = dz
291	DO k = nzt-1, 0, -1
292	!
293	!-- The default value of dz_stretch_level is positive, thus the first
294	!-- condition is always true. Hence, the second condition is necessary.
295	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
296	.AND. dz_stretched < dz_max ) THEN
297	dz_stretched = dz_stretched * dz_stretch_factor
298	dz_stretched = MIN( dz_stretched, dz_max )
299	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
300	ENDIF
301	zu(k) = zu(k+1) - dz_stretched
302	ENDDO
303
304	!
305	!-- Compute the w-levels. They are always staggered half-way between the
306	!-- corresponding u-levels, except in case of dirichlet bc for u and v
307	!-- at the ground. In this case the first u- and w-level are defined at
308	!-- same height. The top w-level (nzt+1) is not used but set for
309	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
310	zw(nzt+1) = dz
311	zw(nzt) = 0.0_wp
312	DO k = 0, nzt
313	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
314	ENDDO
315
316	!
317	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
318	!-- at same height.
319	IF ( ibc_uv_b == 0 ) THEN
320	zu(0) = zw(0)
321	ENDIF
322
323	ENDIF
324
325	!
326	!-- Compute grid lengths.
327	DO k = 1, nzt+1
328	dzu(k) = zu(k) - zu(k-1)
329	ddzu(k) = 1.0_wp / dzu(k)
330	dzw(k) = zw(k) - zw(k-1)
331	ddzw(k) = 1.0_wp / dzw(k)
332	ENDDO
333
334	DO k = 1, nzt
335	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
336	ENDDO
337
338	!
339	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
340	!-- everywhere. For the actual grid, the grid spacing at the lowest level
341	!-- is only dz/2, but should be dz. Therefore, an additional array
342	!-- containing with appropriate grid information is created for these
343	!-- solvers.
344	IF ( psolver(1:9) /= 'multigrid' ) THEN
345	ALLOCATE( ddzu_pres(1:nzt+1) )
346	ddzu_pres = ddzu
347	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
348	ENDIF
349
350	!
351	!-- In case of multigrid method, compute grid lengths and grid factors for the
352	!-- grid levels
353	IF ( psolver(1:9) == 'multigrid' ) THEN
354
355	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
356	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
357	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
358	f1_mg(nzb+1:nzt,maximum_grid_level), &
359	f2_mg(nzb+1:nzt,maximum_grid_level), &
360	f3_mg(nzb+1:nzt,maximum_grid_level) )
361
362	dzu_mg(:,maximum_grid_level) = dzu
363	!
364	!-- Next line to ensure an equally spaced grid.
365	dzu_mg(1,maximum_grid_level) = dzu(2)
366
367	dzw_mg(:,maximum_grid_level) = dzw
368	nzt_l = nzt
369	DO l = maximum_grid_level-1, 1, -1
370	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
371	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
372	nzt_l = nzt_l / 2
373	DO k = 2, nzt_l+1
374	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
375	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
376	ENDDO
377	ENDDO
378
379	nzt_l = nzt
380	dx_l = dx
381	dy_l = dy
382	DO l = maximum_grid_level, 1, -1
383	ddx2_mg(l) = 1.0_wp / dx_l**2
384	ddy2_mg(l) = 1.0_wp / dy_l**2
385	DO k = nzb+1, nzt_l
386	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
387	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
388	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
389	f2_mg(k,l) + f3_mg(k,l)
390	ENDDO
391	nzt_l = nzt_l / 2
392	dx_l = dx_l * 2.0_wp
393	dy_l = dy_l * 2.0_wp
394	ENDDO
395
396	ENDIF
397
398	!
399	!-- Compute the reciprocal values of the horizontal grid lengths.
400	ddx = 1.0_wp / dx
401	ddy = 1.0_wp / dy
402	dx2 = dx * dx
403	dy2 = dy * dy
404	ddx2 = 1.0_wp / dx2
405	ddy2 = 1.0_wp / dy2
406
407	!
408	!-- Compute the grid-dependent mixing length.
409	DO k = 1, nzt
410	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
411	ENDDO
412
413	!
414	!-- Allocate outer and inner index arrays for topography and set
415	!-- defaults.
416	!-- nzb_local has to contain additional layers of ghost points for calculating
417	!-- the flag arrays needed for the multigrid method
418	gls = 2**( maximum_grid_level )
419	IF ( gls < nbgp ) gls = nbgp
420
421	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
422	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
423	nzb_local(-gls:ny+gls,-gls:nx+gls), &
424	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
425	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
426	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
427	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
428	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
429	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
430	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
431	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
432	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
433	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
434	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
435	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
436	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
437	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
438	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
439	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
440	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
441	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
442	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
443	nzb_2d(nysg:nyng,nxlg:nxrg), &
444	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
445	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
446	wall_e_x(nysg:nyng,nxlg:nxrg), &
447	wall_e_y(nysg:nyng,nxlg:nxrg), &
448	wall_u(nysg:nyng,nxlg:nxrg), &
449	wall_v(nysg:nyng,nxlg:nxrg), &
450	wall_w_x(nysg:nyng,nxlg:nxrg), &
451	wall_w_y(nysg:nyng,nxlg:nxrg) )
452
453
454
455	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
456
457
458	nzb_s_inner = nzb; nzb_s_outer = nzb
459	nzb_u_inner = nzb; nzb_u_outer = nzb
460	nzb_v_inner = nzb; nzb_v_outer = nzb
461	nzb_w_inner = nzb; nzb_w_outer = nzb
462
463	rflags_s_inner = 1.0_wp
464	rflags_invers = 1.0_wp
465
466	!
467	!-- Define vertical gridpoint from (or to) which on the usual finite difference
468	!-- form (which does not use surface fluxes) is applied
469	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
470	nzb_diff = nzb + 2
471	ELSE
472	nzb_diff = nzb + 1
473	ENDIF
474	IF ( use_top_fluxes ) THEN
475	nzt_diff = nzt - 1
476	ELSE
477	nzt_diff = nzt
478	ENDIF
479
480	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
481	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
482
483	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
484	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
485	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
486	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
487
488	!
489	!-- Initialize near-wall mixing length l_wall only in the vertical direction
490	!-- for the moment,
491	!-- multiplication with wall_adjustment_factor near the end of this routine
492	l_wall(nzb,:,:) = l_grid(1)
493	DO k = nzb+1, nzt
494	l_wall(k,:,:) = l_grid(k)
495	ENDDO
496	l_wall(nzt+1,:,:) = l_grid(nzt)
497
498	ALLOCATE ( vertical_influence(nzb:nzt) )
499	DO k = 1, nzt
500	vertical_influence(k) = MIN ( INT( l_grid(k) / &
501	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
502	ENDDO
503
504	DO k = 1, MAXVAL( nzb_s_inner )
505	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
506	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
507	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
508	'threshold given by only local', &
509	' &horizontal reduction of near_wall ', &
510	'mixing length l_wall', &
511	' &starting from height level k = ', k, '.'
512	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
513	EXIT
514	ENDIF
515	ENDDO
516	vertical_influence(0) = vertical_influence(1)
517
518	DO i = nxlg, nxrg
519	DO j = nysg, nyng
520	DO k = nzb_s_inner(j,i) + 1, &
521	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
522	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
523	ENDDO
524	ENDDO
525	ENDDO
526
527	!
528	!-- Set outer and inner index arrays for non-flat topography.
529	!-- Here consistency checks concerning domain size and periodicity are
530	!-- necessary.
531	!-- Within this SELECT CASE structure only nzb_local is initialized
532	!-- individually depending on the chosen topography type, all other index
533	!-- arrays are initialized further below.
534	SELECT CASE ( TRIM( topography ) )
535
536	CASE ( 'flat' )
537	!
538	!-- nzb_local is required for the multigrid solver
539	nzb_local = 0
540
541	CASE ( 'single_building' )
542	!
543	!-- Single rectangular building, by default centered in the middle of the
544	!-- total domain
545	blx = NINT( building_length_x / dx )
546	bly = NINT( building_length_y / dy )
547	bh = 0
548	DO k = 0, nzt
549	IF ( building_height .GT. zw(k) ) THEN
550	bh = k+1
551	ENDIF
552	ENDDO
553
554	IF ( building_wall_left == 9999999.9_wp ) THEN
555	building_wall_left = ( nx + 1 - blx ) / 2 * dx
556	ENDIF
557	bxl = NINT( building_wall_left / dx )
558	bxr = bxl + blx
559
560	IF ( building_wall_south == 9999999.9_wp ) THEN
561	building_wall_south = ( ny + 1 - bly ) / 2 * dy
562	ENDIF
563	bys = NINT( building_wall_south / dy )
564	byn = bys + bly
565
566	!
567	!-- Building size has to meet some requirements
568	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
569	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
570	WRITE( message_string, * ) 'inconsistent building parameters:', &
571	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
572	'byn=', byn, 'nx=', nx, 'ny=', ny
573	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
574	ENDIF
575
576	!
577	!-- Define the building.
578	nzb_local = 0
579	nzb_local(bys:byn,bxl:bxr) = bh
580
581	CASE ( 'single_street_canyon' )
582	!
583	!-- Single quasi-2D street canyon of infinite length in x or y direction.
584	!-- The canyon is centered in the other direction by default.
585	IF ( canyon_width_x /= 9999999.9_wp ) THEN
586	!
587	!-- Street canyon in y direction
588	cwx = NINT( canyon_width_x / dx )
589	IF ( canyon_wall_left == 9999999.9_wp ) THEN
590	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
591	ENDIF
592	cxl = NINT( canyon_wall_left / dx )
593	cxr = cxl + cwx
594
595	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
596	!
597	!-- Street canyon in x direction
598	cwy = NINT( canyon_width_y / dy )
599	IF ( canyon_wall_south == 9999999.9_wp ) THEN
600	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
601	ENDIF
602	cys = NINT( canyon_wall_south / dy )
603	cyn = cys + cwy
604
605	ELSE
606
607	message_string = 'no street canyon width given'
608	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
609
610	ENDIF
611
612	ch = 0
613	DO k = 0, nzt
614	IF ( canyon_height .GT. zw(k) ) THEN
615	ch = k+1
616	ENDIF
617	ENDDO
618	dp_level_ind_b = ch
619	!
620	!-- Street canyon size has to meet some requirements
621	IF ( canyon_width_x /= 9999999.9_wp ) THEN
622	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
623	( ch < 3 ) ) THEN
624	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
625	'&cxl=', cxl, 'cxr=', cxr, &
626	'cwx=', cwx, &
627	'ch=', ch, 'nx=', nx, 'ny=', ny
628	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
629	ENDIF
630	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
631	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
632	( ch < 3 ) ) THEN
633	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
634	'&cys=', cys, 'cyn=', cyn, &
635	'cwy=', cwy, &
636	'ch=', ch, 'nx=', nx, 'ny=', ny
637	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
638	ENDIF
639	ENDIF
640	IF ( canyon_width_x /= 9999999.9_wp .AND. &
641	canyon_width_y /= 9999999.9_wp ) THEN
642	message_string = 'inconsistent canyon parameters:' // &
643	'&street canyon can only be oriented' // &
644	'&either in x- or in y-direction'
645	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
646	ENDIF
647
648	nzb_local = ch
649	IF ( canyon_width_x /= 9999999.9_wp ) THEN
650	nzb_local(:,cxl+1:cxr-1) = 0
651	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
652	nzb_local(cys+1:cyn-1,:) = 0
653	ENDIF
654
655	CASE ( 'read_from_file' )
656
657	ALLOCATE ( topo_height(0:ny,0:nx) )
658
659	DO ii = 0, io_blocks-1
660	IF ( ii == io_group ) THEN
661
662	!
663	!-- Arbitrary irregular topography data in PALM format (exactly
664	!-- matching the grid size and total domain size)
665	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
666	FORM='FORMATTED', ERR=10 )
667	DO j = ny, 0, -1
668	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
669	ENDDO
670
671	GOTO 12
672
673	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
674	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
675
676	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
677	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
678
679	12 CLOSE( 90 )
680
681	ENDIF
682	#if defined( __parallel ) && ! defined ( __check )
683	CALL MPI_BARRIER( comm2d, ierr )
684	#endif
685	ENDDO
686
687	!
688	!-- Calculate the index height of the topography
689	DO i = 0, nx
690	DO j = 0, ny
691	nzb_local(j,i) = 0
692	DO k = 0, nzt
693	IF ( topo_height(j,i) .GT. zw(k) ) THEN
694	nzb_local(j,i) = k+1
695	ENDIF
696	ENDDO
697	ENDDO
698	ENDDO
699
700	DEALLOCATE ( topo_height )
701	!
702	!-- Add cyclic boundaries (additional layers are for calculating
703	!-- flag arrays needed for the multigrid sover)
704	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
705	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
706	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
707	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
708
709	CASE DEFAULT
710	!
711	!-- The DEFAULT case is reached either if the parameter topography
712	!-- contains a wrong character string or if the user has defined a special
713	!-- case in the user interface. There, the subroutine user_init_grid
714	!-- checks which of these two conditions applies.
715	CALL user_init_grid( gls, nzb_local )
716
717	END SELECT
718	!
719	!-- Determine the maximum level of topography. Furthermore it is used for
720	!-- steering the degradation of order of the applied advection scheme.
721	!-- In case of non-cyclic lateral boundaries, the order of the advection
722	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
723	nzb_max = MAXVAL( nzb_local )
724	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
725	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
726	nzb_max = nzt
727	ENDIF
728
729	!
730	!-- Consistency checks and index array initialization are only required for
731	!-- non-flat topography, also the initialization of topography height arrays
732	!-- zu_s_inner and zw_w_inner
733	IF ( TRIM( topography ) /= 'flat' ) THEN
734
735	!
736	!-- Consistency checks
737	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
738	WRITE( message_string, * ) 'nzb_local values are outside the', &
739	'model domain', &
740	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
741	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
742	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
743	ENDIF
744
745	IF ( bc_lr == 'cyclic' ) THEN
746	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
747	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
748	message_string = 'nzb_local does not fulfill cyclic' // &
749	' boundary condition in x-direction'
750	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
751	ENDIF
752	ENDIF
753	IF ( bc_ns == 'cyclic' ) THEN
754	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
755	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
756	message_string = 'nzb_local does not fulfill cyclic' // &
757	' boundary condition in y-direction'
758	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
759	ENDIF
760	ENDIF
761
762	IF ( topography_grid_convention == 'cell_edge' ) THEN
763	!
764	!-- The array nzb_local as defined using the 'cell_edge' convention
765	!-- describes the actual total size of topography which is defined at the
766	!-- cell edges where u=0 on the topography walls in x-direction and v=0
767	!-- on the topography walls in y-direction. However, PALM uses individual
768	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
769	!-- Therefore, the extent of topography in nzb_local is now reduced by
770	!-- 1dx at the E topography walls and by 1dy at the N topography walls
771	!-- to form the basis for nzb_s_inner.
772	DO j = -gls, ny + gls
773	DO i = -gls, nx
774	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
775	ENDDO
776	ENDDO
777	!-- apply cyclic boundary conditions in x-direction
778	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
779	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
780	DO i = -gls, nx + gls
781	DO j = -gls, ny
782	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
783	ENDDO
784	ENDDO
785	!-- apply cyclic boundary conditions in y-direction
786	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
787	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
788	ENDIF
789
790	!
791	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
792	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
793	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
794
795	!
796	!-- Initialize remaining index arrays:
797	!-- first pre-initialize them with nzb_s_inner...
798	nzb_u_inner = nzb_s_inner
799	nzb_u_outer = nzb_s_inner
800	nzb_v_inner = nzb_s_inner
801	nzb_v_outer = nzb_s_inner
802	nzb_w_outer = nzb_s_inner
803	nzb_s_outer = nzb_s_inner
804
805	!
806	!-- ...then extend pre-initialized arrays in their according directions
807	!-- based on nzb_local using nzb_tmp as a temporary global index array
808
809	!
810	!-- nzb_s_outer:
811	!-- extend nzb_local east-/westwards first, then north-/southwards
812	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
813	DO j = -1, ny + 1
814	DO i = 0, nx
815	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
816	nzb_local(j,i+1) )
817	ENDDO
818	ENDDO
819	DO i = nxl, nxr
820	DO j = nys, nyn
821	nzb_s_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_s_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_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
834	ENDIF
835	ENDDO
836	!
837	!-- nzb_w_outer:
838	!-- identical to nzb_s_outer
839	nzb_w_outer = nzb_s_outer
840
841	!
842	!-- nzb_u_inner:
843	!-- extend nzb_local rightwards only
844	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
845	DO j = -1, ny + 1
846	DO i = 0, nx + 1
847	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
848	ENDDO
849	ENDDO
850	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
851
852	!
853	!-- nzb_u_outer:
854	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
855	DO i = nxl, nxr
856	DO j = nys, nyn
857	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
858	nzb_tmp(j+1,i) )
859	ENDDO
860	!
861	!-- non-cyclic boundary conditions (overwritten by call of
862	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
863	IF ( nys == 0 ) THEN
864	j = -1
865	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
866	ENDIF
867	IF ( nys == ny ) THEN
868	j = ny + 1
869	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
870	ENDIF
871	ENDDO
872
873	!
874	!-- nzb_v_inner:
875	!-- extend nzb_local northwards only
876	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
877	DO i = -1, nx + 1
878	DO j = 0, ny + 1
879	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
880	ENDDO
881	ENDDO
882	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
883
884	!
885	!-- nzb_v_outer:
886	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
887	DO j = nys, nyn
888	DO i = nxl, nxr
889	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
890	nzb_tmp(j,i+1) )
891	ENDDO
892	!
893	!-- non-cyclic boundary conditions (overwritten by call of
894	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
895	IF ( nxl == 0 ) THEN
896	i = -1
897	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
898	ENDIF
899	IF ( nxr == nx ) THEN
900	i = nx + 1
901	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
902	ENDIF
903	ENDDO
904	#if ! defined ( __check )
905	!
906	!-- Exchange of lateral boundary values (parallel computers) and cyclic
907	!-- boundary conditions, if applicable.
908	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
909	!-- they do not require exchange and are not included here.
910	CALL exchange_horiz_2d_int( nzb_u_inner )
911	CALL exchange_horiz_2d_int( nzb_u_outer )
912	CALL exchange_horiz_2d_int( nzb_v_inner )
913	CALL exchange_horiz_2d_int( nzb_v_outer )
914	CALL exchange_horiz_2d_int( nzb_w_outer )
915	CALL exchange_horiz_2d_int( nzb_s_outer )
916
917	!
918	!-- Allocate and set the arrays containing the topography height
919	IF ( myid == 0 ) THEN
920
921	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
922
923	DO i = 0, nx + 1
924	DO j = 0, ny + 1
925	zu_s_inner(i,j) = zu(nzb_local(j,i))
926	zw_w_inner(i,j) = zw(nzb_local(j,i))
927	ENDDO
928	ENDDO
929
930	ENDIF
931	!
932	!-- Set flag arrays to be used for masking of grid points
933	DO i = nxlg, nxrg
934	DO j = nysg, nyng
935	DO k = nzb, nzt+1
936	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
937	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
938	ENDDO
939	ENDDO
940	ENDDO
941	#endif
942	ENDIF
943
944	#if ! defined ( __check )
945	!
946	!-- Preliminary: to be removed after completion of the topography code!
947	!-- Set the former default k index arrays nzb_2d
948	nzb_2d = nzb
949
950	!
951	!-- Set the individual index arrays which define the k index from which on
952	!-- the usual finite difference form (which does not use surface fluxes) is
953	!-- applied
954	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
955	nzb_diff_u = nzb_u_inner + 2
956	nzb_diff_v = nzb_v_inner + 2
957	nzb_diff_s_inner = nzb_s_inner + 2
958	nzb_diff_s_outer = nzb_s_outer + 2
959	ELSE
960	nzb_diff_u = nzb_u_inner + 1
961	nzb_diff_v = nzb_v_inner + 1
962	nzb_diff_s_inner = nzb_s_inner + 1
963	nzb_diff_s_outer = nzb_s_outer + 1
964	ENDIF
965
966	!
967	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
968	!-- for limitation of near-wall mixing length l_wall further below
969	corner_nl = 0
970	corner_nr = 0
971	corner_sl = 0
972	corner_sr = 0
973	wall_l = 0
974	wall_n = 0
975	wall_r = 0
976	wall_s = 0
977
978	DO i = nxl, nxr
979	DO j = nys, nyn
980	!
981	!-- u-component
982	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
983	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
984	fym(j,i) = 0.0_wp
985	fyp(j,i) = 1.0_wp
986	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
987	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
988	fym(j,i) = 1.0_wp
989	fyp(j,i) = 0.0_wp
990	ENDIF
991	!
992	!-- v-component
993	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
994	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
995	fxm(j,i) = 0.0_wp
996	fxp(j,i) = 1.0_wp
997	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
998	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
999	fxm(j,i) = 1.0_wp
1000	fxp(j,i) = 0.0_wp
1001	ENDIF
1002	!
1003	!-- w-component, also used for scalars, separate arrays for shear
1004	!-- production of tke
1005	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1006	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1007	wall_w_y(j,i) = 1.0_wp
1008	fwym(j,i) = 0.0_wp
1009	fwyp(j,i) = 1.0_wp
1010	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1011	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1012	wall_w_y(j,i) = 1.0_wp
1013	fwym(j,i) = 1.0_wp
1014	fwyp(j,i) = 0.0_wp
1015	ENDIF
1016	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1017	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1018	wall_w_x(j,i) = 1.0_wp
1019	fwxm(j,i) = 0.0_wp
1020	fwxp(j,i) = 1.0_wp
1021	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1022	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1023	wall_w_x(j,i) = 1.0_wp
1024	fwxm(j,i) = 1.0_wp
1025	fwxp(j,i) = 0.0_wp
1026	ENDIF
1027	!
1028	!-- Wall and corner locations inside buildings for limitation of
1029	!-- near-wall mixing length l_wall
1030	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1031
1032	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1033
1034	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1035	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1036	nzb_s_inner(j,i-1) ) + 1
1037	ENDIF
1038
1039	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1040	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1041	nzb_s_inner(j,i+1) ) + 1
1042	ENDIF
1043
1044	ENDIF
1045
1046	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1047
1048	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1049	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1050	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1051	nzb_s_inner(j,i-1) ) + 1
1052	ENDIF
1053
1054	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1055	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1056	nzb_s_inner(j,i+1) ) + 1
1057	ENDIF
1058
1059	ENDIF
1060
1061	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1062	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1063	ENDIF
1064
1065	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1066	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1067	ENDIF
1068
1069	ENDDO
1070	ENDDO
1071
1072	!
1073	!-- Calculate wall flag arrays for the multigrid method
1074	IF ( psolver(1:9) == 'multigrid' ) THEN
1075	!
1076	!-- Gridpoint increment of the current level
1077	inc = 1
1078
1079	DO l = maximum_grid_level, 1 , -1
1080
1081	nxl_l = nxl_mg(l)
1082	nxr_l = nxr_mg(l)
1083	nys_l = nys_mg(l)
1084	nyn_l = nyn_mg(l)
1085	nzt_l = nzt_mg(l)
1086
1087	!
1088	!-- Assign the flag level to be calculated
1089	SELECT CASE ( l )
1090	CASE ( 1 )
1091	flags => wall_flags_1
1092	CASE ( 2 )
1093	flags => wall_flags_2
1094	CASE ( 3 )
1095	flags => wall_flags_3
1096	CASE ( 4 )
1097	flags => wall_flags_4
1098	CASE ( 5 )
1099	flags => wall_flags_5
1100	CASE ( 6 )
1101	flags => wall_flags_6
1102	CASE ( 7 )
1103	flags => wall_flags_7
1104	CASE ( 8 )
1105	flags => wall_flags_8
1106	CASE ( 9 )
1107	flags => wall_flags_9
1108	CASE ( 10 )
1109	flags => wall_flags_10
1110	END SELECT
1111
1112	!
1113	!-- Depending on the grid level, set the respective bits in case of
1114	!-- neighbouring walls
1115	!-- Bit 0: wall to the bottom
1116	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1117	!-- Bit 2: wall to the south
1118	!-- Bit 3: wall to the north
1119	!-- Bit 4: wall to the left
1120	!-- Bit 5: wall to the right
1121	!-- Bit 6: inside building
1122
1123	flags = 0
1124
1125	!
1126	!-- In case of masking method, flags are not set and multigrid method
1127	!-- works like FFT-solver
1128	IF ( .NOT. masking_method ) THEN
1129
1130	DO i = nxl_l-1, nxr_l+1
1131	DO j = nys_l-1, nyn_l+1
1132	DO k = nzb, nzt_l+1
1133
1134	!
1135	!-- Inside/outside building (inside building does not need
1136	!-- further tests for walls)
1137	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1138
1139	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1140
1141	ELSE
1142	!
1143	!-- Bottom wall
1144	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1145	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1146	ENDIF
1147	!
1148	!-- South wall
1149	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1150	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1151	ENDIF
1152	!
1153	!-- North wall
1154	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1155	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1156	ENDIF
1157	!
1158	!-- Left wall
1159	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1160	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1161	ENDIF
1162	!
1163	!-- Right wall
1164	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1165	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1166	ENDIF
1167
1168	ENDIF
1169
1170	ENDDO
1171	ENDDO
1172	ENDDO
1173
1174	ENDIF
1175
1176	!
1177	!-- Test output of flag arrays
1178	! i = nxl_l
1179	! WRITE (9,*) ' '
1180	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1181	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1182	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1183	! DO k = nzt_l+1, nzb, -1
1184	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1185	! ENDDO
1186
1187	inc = inc * 2
1188
1189	ENDDO
1190
1191	ENDIF
1192	!
1193	!-- Allocate flags needed for masking walls.
1194	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr), &
1195	wall_flags_00(nzb:nzt,nys:nyn,nxl:nxr) )
1196	wall_flags_0 = 0
1197	wall_flags_00 = 0
1198
1199	IF ( scalar_advec == 'ws-scheme' .OR. &
1200	scalar_advec == 'ws-scheme-mono' ) THEN
1201	!
1202	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1203	!-- near topography, inflow- and outflow boundaries as well as bottom and
1204	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1205	!-- grid points.
1206	DO i = nxl, nxr
1207	DO j = nys, nyn
1208	DO k = nzb_s_inner(j,i)+1, nzt
1209	!
1210	!-- scalar - x-direction
1211	!-- WS1 (0), WS3 (1), WS5 (2)
1212	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1213	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1214	.AND. i == nxr ) ) THEN
1215	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1216	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1217	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1218	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1219	) THEN
1220	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1221	ELSE
1222	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1223	ENDIF
1224	!
1225	!-- scalar - y-direction
1226	!-- WS1 (3), WS3 (4), WS5 (5)
1227	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1228	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1229	.AND. j == nyn ) ) THEN
1230	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1231	!-- WS3
1232	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1233	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1234	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1235	) THEN
1236	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1237	!-- WS5
1238	ELSE
1239	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1240	ENDIF
1241	!
1242	!-- scalar - z-direction
1243	!-- WS1 (6), WS3 (7), WS5 (8)
1244	flag_set = .FALSE.
1245	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1246	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1247	flag_set = .TRUE.
1248	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1249	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1250	flag_set = .TRUE.
1251	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1252	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1253	ENDIF
1254	ENDDO
1255	ENDDO
1256	ENDDO
1257	ENDIF
1258
1259	IF ( momentum_advec == 'ws-scheme' ) THEN
1260	!
1261	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1262	!-- near topography, inflow- and outflow boundaries as well as bottom and
1263	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1264	!-- grid points.
1265	DO i = nxl, nxr
1266	DO j = nys, nyn
1267	DO k = nzb+1, nzt
1268	!
1269	!-- At first, set flags to WS1.
1270	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1271	!-- in order to handle the left/south flux.
1272	!-- near vertical walls.
1273	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1274	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1275	!
1276	!-- u component - x-direction
1277	!-- WS1 (9), WS3 (10), WS5 (11)
1278	IF ( k <= nzb_u_inner(j,i+1) &
1279	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
1280	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
1281	) THEN
1282	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1283	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1284	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
1285	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
1286	) THEN
1287	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1288	!
1289	!-- Clear flag for WS1
1290	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1291	ELSE
1292	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1293	!
1294	!-- Clear flag for WS1
1295	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1296	ENDIF
1297	!
1298	!-- u component - y-direction
1299	!-- WS1 (12), WS3 (13), WS5 (14)
1300	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1301	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1302	.AND. j == nyn ) ) THEN
1303	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1304	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1305	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
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), 13 )
1309	!
1310	!-- Clear flag for WS1
1311	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1312	ELSE
1313	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1314	!
1315	!-- Clear flag for WS1
1316	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1317	ENDIF
1318	!
1319	!-- u component - z-direction
1320	!-- WS1 (15), WS3 (16), WS5 (17)
1321	flag_set = .FALSE.
1322	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1323	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1324	flag_set = .TRUE.
1325	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1326	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1327	flag_set = .TRUE.
1328	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1329	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1330	ENDIF
1331
1332	ENDDO
1333	ENDDO
1334	ENDDO
1335
1336	DO i = nxl, nxr
1337	DO j = nys, nyn
1338	DO k = nzb+1, nzt
1339	!
1340	!-- At first, set flags to WS1.
1341	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1342	!-- in order to handle the left/south flux.
1343	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1344	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1345	!
1346	!-- v component - x-direction
1347	!-- WS1 (18), WS3 (19), WS5 (20)
1348	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1349	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
1350	.AND. i == nxr ) ) THEN
1351	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1352	!-- WS3
1353	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1354	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1355	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1356	) THEN
1357	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1358	!
1359	!-- Clear flag for WS1
1360	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1361	ELSE
1362	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1363	!
1364	!-- Clear flag for WS1
1365	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1366	ENDIF
1367	!
1368	!-- v component - y-direction
1369	!-- WS1 (21), WS3 (22), WS5 (23)
1370	IF ( k <= nzb_v_inner(j+1,i) &
1371	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
1372	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
1373	) THEN
1374	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1375	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1376	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
1377	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
1378	) THEN
1379	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1380	!
1381	!-- Clear flag for WS1
1382	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1383	ELSE
1384	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1385	!
1386	!-- Clear flag for WS1
1387	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1388	ENDIF
1389	!
1390	!-- v component - z-direction
1391	!-- WS1 (24), WS3 (25), WS5 (26)
1392	flag_set = .FALSE.
1393	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1394	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1395	flag_set = .TRUE.
1396	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1397	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1398	flag_set = .TRUE.
1399	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1400	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1401	ENDIF
1402
1403	ENDDO
1404	ENDDO
1405	ENDDO
1406	DO i = nxl, nxr
1407	DO j = nys, nyn
1408	DO k = nzb+1, nzt
1409	!
1410	!-- At first, set flags to WS1.
1411	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1412	!-- in order to handle the left/south flux.
1413	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1414	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1415	!
1416	!-- w component - x-direction
1417	!-- WS1 (27), WS3 (28), WS5 (29)
1418	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1419	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1420	.AND. i == nxr ) ) THEN
1421	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1422	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1423	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1424	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1425	) THEN
1426	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1427	!
1428	!-- Clear flag for WS1
1429	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1430	ELSE
1431	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1432	!
1433	!-- Clear flag for WS1
1434	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1435	ENDIF
1436	!
1437	!-- w component - y-direction
1438	!-- WS1 (30), WS3 (31), WS5 (32)
1439	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1440	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1441	.AND. j == nyn ) ) THEN
1442	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1443	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1444	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1445	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1446	) THEN
1447	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1448	!
1449	!-- Clear flag for WS1
1450	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1451	ELSE
1452	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1453	!
1454	!-- Clear flag for WS1
1455	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1456	ENDIF
1457	!
1458	!-- w component - z-direction
1459	!-- WS1 (33), WS3 (34), WS5 (35)
1460	flag_set = .FALSE.
1461	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1462	.OR. k == nzt ) THEN
1463	!
1464	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1465	!-- set, although this is not a prognostic level. However,
1466	!-- contrary to the advection of u,v and s this is necessary
1467	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1468	!-- at k == nzb_w_inner(j,i)+1.
1469	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1470	flag_set = .TRUE.
1471	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1472	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1473	flag_set = .TRUE.
1474	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1475	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1476	ENDIF
1477
1478	ENDDO
1479	ENDDO
1480	ENDDO
1481
1482	ENDIF
1483
1484	!
1485	!-- In case of topography: limit near-wall mixing length l_wall further:
1486	!-- Go through all points of the subdomain one by one and look for the closest
1487	!-- surface
1488	IF ( TRIM(topography) /= 'flat' ) THEN
1489	DO i = nxl, nxr
1490	DO j = nys, nyn
1491
1492	nzb_si = nzb_s_inner(j,i)
1493	vi = vertical_influence(nzb_si)
1494
1495	IF ( wall_n(j,i) > 0 ) THEN
1496	!
1497	!-- North wall (y distance)
1498	DO k = wall_n(j,i), nzb_si
1499	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1500	ENDDO
1501	!
1502	!-- Above North wall (yz distance)
1503	DO k = nzb_si + 1, nzb_si + vi
1504	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1505	SQRT( 0.25_wp * dy**2 + &
1506	( zu(k) - zw(nzb_si) )**2 ) )
1507	ENDDO
1508	!
1509	!-- Northleft corner (xy distance)
1510	IF ( corner_nl(j,i) > 0 ) THEN
1511	DO k = corner_nl(j,i), nzb_si
1512	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1513	0.5_wp * SQRT( dx2 + dy2 ) )
1514	ENDDO
1515	!
1516	!-- Above Northleft corner (xyz distance)
1517	DO k = nzb_si + 1, nzb_si + vi
1518	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1519	SQRT( 0.25_wp * (dx2 + dy2) + &
1520	( zu(k) - zw(nzb_si) )**2 ) )
1521	ENDDO
1522	ENDIF
1523	!
1524	!-- Northright corner (xy distance)
1525	IF ( corner_nr(j,i) > 0 ) THEN
1526	DO k = corner_nr(j,i), nzb_si
1527	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1528	0.5_wp * SQRT( dx2 + dy2 ) )
1529	ENDDO
1530	!
1531	!-- Above northright corner (xyz distance)
1532	DO k = nzb_si + 1, nzb_si + vi
1533	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1534	SQRT( 0.25_wp * (dx2 + dy2) + &
1535	( zu(k) - zw(nzb_si) )**2 ) )
1536	ENDDO
1537	ENDIF
1538	ENDIF
1539
1540	IF ( wall_s(j,i) > 0 ) THEN
1541	!
1542	!-- South wall (y distance)
1543	DO k = wall_s(j,i), nzb_si
1544	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1545	ENDDO
1546	!
1547	!-- Above south wall (yz distance)
1548	DO k = nzb_si + 1, nzb_si + vi
1549	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1550	SQRT( 0.25_wp * dy**2 + &
1551	( zu(k) - zw(nzb_si) )**2 ) )
1552	ENDDO
1553	!
1554	!-- Southleft corner (xy distance)
1555	IF ( corner_sl(j,i) > 0 ) THEN
1556	DO k = corner_sl(j,i), nzb_si
1557	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1558	0.5_wp * SQRT( dx2 + dy2 ) )
1559	ENDDO
1560	!
1561	!-- Above southleft corner (xyz distance)
1562	DO k = nzb_si + 1, nzb_si + vi
1563	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1564	SQRT( 0.25_wp * (dx2 + dy2) + &
1565	( zu(k) - zw(nzb_si) )**2 ) )
1566	ENDDO
1567	ENDIF
1568	!
1569	!-- Southright corner (xy distance)
1570	IF ( corner_sr(j,i) > 0 ) THEN
1571	DO k = corner_sr(j,i), nzb_si
1572	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1573	0.5_wp * SQRT( dx2 + dy2 ) )
1574	ENDDO
1575	!
1576	!-- Above southright corner (xyz distance)
1577	DO k = nzb_si + 1, nzb_si + vi
1578	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1579	SQRT( 0.25_wp * (dx2 + dy2) + &
1580	( zu(k) - zw(nzb_si) )**2 ) )
1581	ENDDO
1582	ENDIF
1583
1584	ENDIF
1585
1586	IF ( wall_l(j,i) > 0 ) THEN
1587	!
1588	!-- Left wall (x distance)
1589	DO k = wall_l(j,i), nzb_si
1590	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1591	ENDDO
1592	!
1593	!-- Above left wall (xz distance)
1594	DO k = nzb_si + 1, nzb_si + vi
1595	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1596	SQRT( 0.25_wp * dx**2 + &
1597	( zu(k) - zw(nzb_si) )**2 ) )
1598	ENDDO
1599	ENDIF
1600
1601	IF ( wall_r(j,i) > 0 ) THEN
1602	!
1603	!-- Right wall (x distance)
1604	DO k = wall_r(j,i), nzb_si
1605	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1606	ENDDO
1607	!
1608	!-- Above right wall (xz distance)
1609	DO k = nzb_si + 1, nzb_si + vi
1610	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1611	SQRT( 0.25_wp * dx**2 + &
1612	( zu(k) - zw(nzb_si) )**2 ) )
1613	ENDDO
1614
1615	ENDIF
1616
1617	ENDDO
1618	ENDDO
1619
1620	ENDIF
1621
1622	!
1623	!-- Multiplication with wall_adjustment_factor
1624	l_wall = wall_adjustment_factor * l_wall
1625
1626	!
1627	!-- Set lateral boundary conditions for l_wall
1628	CALL exchange_horiz( l_wall, nbgp )
1629
1630	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1631	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1632
1633	#endif
1634
1635	END SUBROUTINE init_grid

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