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source: palm/trunk/SOURCE/init_grid.f90 @ 1724

Last change on this file since 1724 was 1692, checked in by maronga, 8 years ago
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1	!> @file init_grid.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2015 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! -----------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_grid.f90 1692 2015-10-26 16:29:17Z boeske $
26	!
27	! 1691 2015-10-26 16:17:44Z maronga
28	! Renamed prandtl_layer to constant_flux_layer.
29	!
30	! 1682 2015-10-07 23:56:08Z knoop
31	! Code annotations made doxygen readable
32	!
33	! 1677 2015-10-02 13:25:23Z boeske
34	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
35	!
36	! 1675 2015-10-02 08:28:59Z gronemeier
37	! Bugfix: Definition of topography grid levels
38	!
39	! 1660 2015-09-21 08:15:16Z gronemeier
40	! Bugfix: Definition of topography grid levels if vertical grid stretching
41	! starts below the maximum topography height.
42	!
43	! 1580 2015-04-10 13:43:49Z suehring
44	! Bugfix: setting flags for 5th order scheme near buildings
45	!
46	! 1575 2015-03-27 09:56:27Z raasch
47	! adjustments for psolver-queries
48	!
49	! 1557 2015-03-05 16:43:04Z suehring
50	! Adjustment for monotoinic limiter
51	!
52	! 1418 2014-06-06 13:05:08Z fricke
53	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
54	! condition and a negative value for dz_stretch_level the condition
55	! was always true for the whole model domain
56	!
57	! 1409 2014-05-23 12:11:32Z suehring
58	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
59	! j <= nysv
60	!
61	! 1353 2014-04-08 15:21:23Z heinze
62	! REAL constants provided with KIND-attribute
63	!
64	! 1322 2014-03-20 16:38:49Z raasch
65	! REAL constants defined as wp-kind
66	!
67	! 1320 2014-03-20 08:40:49Z raasch
68	! ONLY-attribute added to USE-statements,
69	! kind-parameters added to all INTEGER and REAL declaration statements,
70	! kinds are defined in new module kinds,
71	! revision history before 2012 removed,
72	! comment fields (!:) to be used for variable explanations added to
73	! all variable declaration statements
74	!
75	! 1221 2013-09-10 08:59:13Z raasch
76	! wall_flags_00 introduced to hold bits 32-63,
77	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
78	! loops optimized for openACC (pres + flow_statistics)
79	!
80	! 1092 2013-02-02 11:24:22Z raasch
81	! unused variables removed
82	!
83	! 1069 2012-11-28 16:18:43Z maronga
84	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
85	! model in case of coupled runs
86	!
87	! 1036 2012-10-22 13:43:42Z raasch
88	! code put under GPL (PALM 3.9)
89	!
90	! 1015 2012-09-27 09:23:24Z raasch
91	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
92	! nzb_w_inner+1
93	!
94	! 996 2012-09-07 10:41:47Z raasch
95	! little reformatting
96	!
97	! 978 2012-08-09 08:28:32Z fricke
98	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
99	! Bugfix: Set wall_flags_0 for inflow boundary
100	!
101	! 927 2012-06-06 19:15:04Z raasch
102	! Wall flags are not set for multigrid method in case of masking method
103	!
104	! 864 2012-03-27 15:10:33Z gryschka
105	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
106	! were not correctly defined for k=1.
107	!
108	! 861 2012-03-26 14:18:34Z suehring
109	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
110	! inflow and outflow boundaries as well as near the bottom and the top of the
111	! model domain.!
112	! Initialization of nzb_s_inner and nzb_w_inner.
113	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
114	! while setting wall_flags_0
115	!
116	! 843 2012-02-29 15:16:21Z gryschka
117	! In case of ocean and dirichlet bc for u and v at the bottom
118	! the first u-level ist defined at same height as the first w-level
119	!
120	! 818 2012-02-08 16:11:23Z maronga
121	! Bugfix: topo_height is only required if topography is used. It is thus now
122	! allocated in the topography branch
123	!
124	! 809 2012-01-30 13:32:58Z maronga
125	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
126	!
127	! 807 2012-01-25 11:53:51Z maronga
128	! New cpp directive "__check" implemented which is used by check_namelist_files
129	!
130	! Revision 1.1 1997/08/11 06:17:45 raasch
131	! Initial revision (Testversion)
132	!
133	!
134	! Description:
135	! ------------
136	!> Creating grid depending constants
137	!------------------------------------------------------------------------------!
138	SUBROUTINE init_grid
139
140
141	USE arrays_3d, &
142	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
143	f2_mg, f3_mg, l_grid, l_wall, zu, zw
144
145	USE control_parameters, &
146	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
147	building_length_y, building_wall_left, building_wall_south, &
148	canyon_height, canyon_wall_left, canyon_wall_south, &
149	canyon_width_x, canyon_width_y, constant_flux_layer, &
150	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
151	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
152	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
153	masking_method, maximum_grid_level, message_string, &
154	momentum_advec, ocean, outflow_l, outflow_n, outflow_r, &
155	outflow_s, psolver, scalar_advec, topography, &
156	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
157	wall_adjustment_factor
158
159	USE grid_variables, &
160	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
161	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
162	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
163
164	USE indices, &
165	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
166	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
167	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
168	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
169	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
170	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
171	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
172	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
173	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
174	wall_flags_9
175
176	USE kinds
177
178	USE pegrid
179
180	IMPLICIT NONE
181
182	INTEGER(iwp) :: bh !<
183	INTEGER(iwp) :: blx !<
184	INTEGER(iwp) :: bly !<
185	INTEGER(iwp) :: bxl !<
186	INTEGER(iwp) :: bxr !<
187	INTEGER(iwp) :: byn !<
188	INTEGER(iwp) :: bys !<
189	INTEGER(iwp) :: ch !<
190	INTEGER(iwp) :: cwx !<
191	INTEGER(iwp) :: cwy !<
192	INTEGER(iwp) :: cxl !<
193	INTEGER(iwp) :: cxr !<
194	INTEGER(iwp) :: cyn !<
195	INTEGER(iwp) :: cys !<
196	INTEGER(iwp) :: gls !<
197	INTEGER(iwp) :: i !<
198	INTEGER(iwp) :: ii !<
199	INTEGER(iwp) :: inc !<
200	INTEGER(iwp) :: j !<
201	INTEGER(iwp) :: k !<
202	INTEGER(iwp) :: l !<
203	INTEGER(iwp) :: nxl_l !<
204	INTEGER(iwp) :: nxr_l !<
205	INTEGER(iwp) :: nyn_l !<
206	INTEGER(iwp) :: nys_l !<
207	INTEGER(iwp) :: nzb_si !<
208	INTEGER(iwp) :: nzt_l !<
209	INTEGER(iwp) :: vi !<
210
211	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
212
213	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
214	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
215	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
216	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
217	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
218	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
219	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
220	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
221	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
222	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
223
224	LOGICAL :: flag_set = .FALSE. !<
225
226	REAL(wp) :: dx_l !<
227	REAL(wp) :: dy_l !<
228	REAL(wp) :: dz_stretched !<
229
230	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
231
232
233	!
234	!-- Calculation of horizontal array bounds including ghost layers
235	nxlg = nxl - nbgp
236	nxrg = nxr + nbgp
237	nysg = nys - nbgp
238	nyng = nyn + nbgp
239
240	!
241	!-- Allocate grid arrays
242	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
243	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
244
245	!
246	!-- Compute height of u-levels from constant grid length and dz stretch factors
247	IF ( dz == -1.0_wp ) THEN
248	message_string = 'missing dz'
249	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
250	ELSEIF ( dz <= 0.0_wp ) THEN
251	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
252	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
253	ENDIF
254
255	!
256	!-- Define the vertical grid levels
257	IF ( .NOT. ocean ) THEN
258	!
259	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
260	!-- The second u-level (k=1) corresponds to the top of the
261	!-- Prandtl-layer.
262
263	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
264	zu(0) = 0.0_wp
265	! zu(0) = - dz * 0.5_wp
266	ELSE
267	zu(0) = - dz * 0.5_wp
268	ENDIF
269	zu(1) = dz * 0.5_wp
270
271	dz_stretch_level_index = nzt+1
272	dz_stretched = dz
273	DO k = 2, nzt+1
274	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
275	dz_stretched = dz_stretched * dz_stretch_factor
276	dz_stretched = MIN( dz_stretched, dz_max )
277	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
278	ENDIF
279	zu(k) = zu(k-1) + dz_stretched
280	ENDDO
281
282	!
283	!-- Compute the w-levels. They are always staggered half-way between the
284	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
285	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
286	!-- The top w-level is extrapolated linearly.
287	zw(0) = 0.0_wp
288	DO k = 1, nzt
289	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
290	ENDDO
291	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
292
293	ELSE
294	!
295	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
296	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
297	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
298	!-- w-level are defined at same height, but staggered from the second level.
299	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
300	zu(nzt+1) = dz * 0.5_wp
301	zu(nzt) = - dz * 0.5_wp
302
303	dz_stretch_level_index = 0
304	dz_stretched = dz
305	DO k = nzt-1, 0, -1
306	!
307	!-- The default value of dz_stretch_level is positive, thus the first
308	!-- condition is always true. Hence, the second condition is necessary.
309	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
310	.AND. dz_stretched < dz_max ) THEN
311	dz_stretched = dz_stretched * dz_stretch_factor
312	dz_stretched = MIN( dz_stretched, dz_max )
313	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
314	ENDIF
315	zu(k) = zu(k+1) - dz_stretched
316	ENDDO
317
318	!
319	!-- Compute the w-levels. They are always staggered half-way between the
320	!-- corresponding u-levels, except in case of dirichlet bc for u and v
321	!-- at the ground. In this case the first u- and w-level are defined at
322	!-- same height. The top w-level (nzt+1) is not used but set for
323	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
324	zw(nzt+1) = dz
325	zw(nzt) = 0.0_wp
326	DO k = 0, nzt
327	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
328	ENDDO
329
330	!
331	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
332	!-- at same height.
333	IF ( ibc_uv_b == 0 ) THEN
334	zu(0) = zw(0)
335	ENDIF
336
337	ENDIF
338
339	!
340	!-- Compute grid lengths.
341	DO k = 1, nzt+1
342	dzu(k) = zu(k) - zu(k-1)
343	ddzu(k) = 1.0_wp / dzu(k)
344	dzw(k) = zw(k) - zw(k-1)
345	ddzw(k) = 1.0_wp / dzw(k)
346	ENDDO
347
348	DO k = 1, nzt
349	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
350	ENDDO
351
352	!
353	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
354	!-- everywhere. For the actual grid, the grid spacing at the lowest level
355	!-- is only dz/2, but should be dz. Therefore, an additional array
356	!-- containing with appropriate grid information is created for these
357	!-- solvers.
358	IF ( psolver(1:9) /= 'multigrid' ) THEN
359	ALLOCATE( ddzu_pres(1:nzt+1) )
360	ddzu_pres = ddzu
361	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
362	ENDIF
363
364	!
365	!-- In case of multigrid method, compute grid lengths and grid factors for the
366	!-- grid levels
367	IF ( psolver(1:9) == 'multigrid' ) THEN
368
369	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
370	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
371	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
372	f1_mg(nzb+1:nzt,maximum_grid_level), &
373	f2_mg(nzb+1:nzt,maximum_grid_level), &
374	f3_mg(nzb+1:nzt,maximum_grid_level) )
375
376	dzu_mg(:,maximum_grid_level) = dzu
377	!
378	!-- Next line to ensure an equally spaced grid.
379	dzu_mg(1,maximum_grid_level) = dzu(2)
380
381	dzw_mg(:,maximum_grid_level) = dzw
382	nzt_l = nzt
383	DO l = maximum_grid_level-1, 1, -1
384	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
385	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
386	nzt_l = nzt_l / 2
387	DO k = 2, nzt_l+1
388	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
389	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
390	ENDDO
391	ENDDO
392
393	nzt_l = nzt
394	dx_l = dx
395	dy_l = dy
396	DO l = maximum_grid_level, 1, -1
397	ddx2_mg(l) = 1.0_wp / dx_l**2
398	ddy2_mg(l) = 1.0_wp / dy_l**2
399	DO k = nzb+1, nzt_l
400	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
401	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
402	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
403	f2_mg(k,l) + f3_mg(k,l)
404	ENDDO
405	nzt_l = nzt_l / 2
406	dx_l = dx_l * 2.0_wp
407	dy_l = dy_l * 2.0_wp
408	ENDDO
409
410	ENDIF
411
412	!
413	!-- Compute the reciprocal values of the horizontal grid lengths.
414	ddx = 1.0_wp / dx
415	ddy = 1.0_wp / dy
416	dx2 = dx * dx
417	dy2 = dy * dy
418	ddx2 = 1.0_wp / dx2
419	ddy2 = 1.0_wp / dy2
420
421	!
422	!-- Compute the grid-dependent mixing length.
423	DO k = 1, nzt
424	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
425	ENDDO
426
427	!
428	!-- Allocate outer and inner index arrays for topography and set
429	!-- defaults.
430	!-- nzb_local has to contain additional layers of ghost points for calculating
431	!-- the flag arrays needed for the multigrid method
432	gls = 2**( maximum_grid_level )
433	IF ( gls < nbgp ) gls = nbgp
434
435	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
436	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
437	nzb_local(-gls:ny+gls,-gls:nx+gls), &
438	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
439	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
440	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
441	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
442	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
443	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
444	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
445	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
446	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
447	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
448	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
449	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
450	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
451	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
452	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
453	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
454	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
455	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
456	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
457	nzb_2d(nysg:nyng,nxlg:nxrg), &
458	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
459	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
460	wall_e_x(nysg:nyng,nxlg:nxrg), &
461	wall_e_y(nysg:nyng,nxlg:nxrg), &
462	wall_u(nysg:nyng,nxlg:nxrg), &
463	wall_v(nysg:nyng,nxlg:nxrg), &
464	wall_w_x(nysg:nyng,nxlg:nxrg), &
465	wall_w_y(nysg:nyng,nxlg:nxrg) )
466
467
468
469	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
470
471
472	nzb_s_inner = nzb; nzb_s_outer = nzb
473	nzb_u_inner = nzb; nzb_u_outer = nzb
474	nzb_v_inner = nzb; nzb_v_outer = nzb
475	nzb_w_inner = nzb; nzb_w_outer = nzb
476
477	rflags_s_inner = 1.0_wp
478	rflags_invers = 1.0_wp
479
480	!
481	!-- Define vertical gridpoint from (or to) which on the usual finite difference
482	!-- form (which does not use surface fluxes) is applied
483	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
484	nzb_diff = nzb + 2
485	ELSE
486	nzb_diff = nzb + 1
487	ENDIF
488	IF ( use_top_fluxes ) THEN
489	nzt_diff = nzt - 1
490	ELSE
491	nzt_diff = nzt
492	ENDIF
493
494	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
495	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
496
497	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
498	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
499	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
500	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
501
502	!
503	!-- Initialize near-wall mixing length l_wall only in the vertical direction
504	!-- for the moment,
505	!-- multiplication with wall_adjustment_factor near the end of this routine
506	l_wall(nzb,:,:) = l_grid(1)
507	DO k = nzb+1, nzt
508	l_wall(k,:,:) = l_grid(k)
509	ENDDO
510	l_wall(nzt+1,:,:) = l_grid(nzt)
511
512	ALLOCATE ( vertical_influence(nzb:nzt) )
513	DO k = 1, nzt
514	vertical_influence(k) = MIN ( INT( l_grid(k) / &
515	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
516	ENDDO
517
518	DO k = 1, MAXVAL( nzb_s_inner )
519	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
520	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
521	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
522	'threshold given by only local', &
523	' &horizontal reduction of near_wall ', &
524	'mixing length l_wall', &
525	' &starting from height level k = ', k, '.'
526	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
527	EXIT
528	ENDIF
529	ENDDO
530	vertical_influence(0) = vertical_influence(1)
531
532	DO i = nxlg, nxrg
533	DO j = nysg, nyng
534	DO k = nzb_s_inner(j,i) + 1, &
535	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
536	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
537	ENDDO
538	ENDDO
539	ENDDO
540
541	!
542	!-- Set outer and inner index arrays for non-flat topography.
543	!-- Here consistency checks concerning domain size and periodicity are
544	!-- necessary.
545	!-- Within this SELECT CASE structure only nzb_local is initialized
546	!-- individually depending on the chosen topography type, all other index
547	!-- arrays are initialized further below.
548	SELECT CASE ( TRIM( topography ) )
549
550	CASE ( 'flat' )
551	!
552	!-- nzb_local is required for the multigrid solver
553	nzb_local = 0
554
555	CASE ( 'single_building' )
556	!
557	!-- Single rectangular building, by default centered in the middle of the
558	!-- total domain
559	blx = NINT( building_length_x / dx )
560	bly = NINT( building_length_y / dy )
561	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
562	IF ( ABS( zw(bh ) - building_height ) == &
563	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
564
565	IF ( building_wall_left == 9999999.9_wp ) THEN
566	building_wall_left = ( nx + 1 - blx ) / 2 * dx
567	ENDIF
568	bxl = NINT( building_wall_left / dx )
569	bxr = bxl + blx
570
571	IF ( building_wall_south == 9999999.9_wp ) THEN
572	building_wall_south = ( ny + 1 - bly ) / 2 * dy
573	ENDIF
574	bys = NINT( building_wall_south / dy )
575	byn = bys + bly
576
577	!
578	!-- Building size has to meet some requirements
579	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
580	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
581	WRITE( message_string, * ) 'inconsistent building parameters:', &
582	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
583	'byn=', byn, 'nx=', nx, 'ny=', ny
584	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
585	ENDIF
586
587	!
588	!-- Define the building.
589	nzb_local = 0
590	nzb_local(bys:byn,bxl:bxr) = bh
591
592	CASE ( 'single_street_canyon' )
593	!
594	!-- Single quasi-2D street canyon of infinite length in x or y direction.
595	!-- The canyon is centered in the other direction by default.
596	IF ( canyon_width_x /= 9999999.9_wp ) THEN
597	!
598	!-- Street canyon in y direction
599	cwx = NINT( canyon_width_x / dx )
600	IF ( canyon_wall_left == 9999999.9_wp ) THEN
601	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
602	ENDIF
603	cxl = NINT( canyon_wall_left / dx )
604	cxr = cxl + cwx
605
606	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
607	!
608	!-- Street canyon in x direction
609	cwy = NINT( canyon_width_y / dy )
610	IF ( canyon_wall_south == 9999999.9_wp ) THEN
611	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
612	ENDIF
613	cys = NINT( canyon_wall_south / dy )
614	cyn = cys + cwy
615
616	ELSE
617
618	message_string = 'no street canyon width given'
619	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
620
621	ENDIF
622
623	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
624	IF ( ABS( zw(ch ) - canyon_height ) == &
625	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
626
627	dp_level_ind_b = ch
628	!
629	!-- Street canyon size has to meet some requirements
630	IF ( canyon_width_x /= 9999999.9_wp ) THEN
631	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
632	( ch < 3 ) ) THEN
633	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
634	'&cxl=', cxl, 'cxr=', cxr, &
635	'cwx=', cwx, &
636	'ch=', ch, 'nx=', nx, 'ny=', ny
637	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
638	ENDIF
639	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
640	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
641	( ch < 3 ) ) THEN
642	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
643	'&cys=', cys, 'cyn=', cyn, &
644	'cwy=', cwy, &
645	'ch=', ch, 'nx=', nx, 'ny=', ny
646	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
647	ENDIF
648	ENDIF
649	IF ( canyon_width_x /= 9999999.9_wp .AND. &
650	canyon_width_y /= 9999999.9_wp ) THEN
651	message_string = 'inconsistent canyon parameters:' // &
652	'&street canyon can only be oriented' // &
653	'&either in x- or in y-direction'
654	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
655	ENDIF
656
657	nzb_local = ch
658	IF ( canyon_width_x /= 9999999.9_wp ) THEN
659	nzb_local(:,cxl+1:cxr-1) = 0
660	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
661	nzb_local(cys+1:cyn-1,:) = 0
662	ENDIF
663
664	CASE ( 'read_from_file' )
665
666	ALLOCATE ( topo_height(0:ny,0:nx) )
667
668	DO ii = 0, io_blocks-1
669	IF ( ii == io_group ) THEN
670
671	!
672	!-- Arbitrary irregular topography data in PALM format (exactly
673	!-- matching the grid size and total domain size)
674	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
675	FORM='FORMATTED', ERR=10 )
676	DO j = ny, 0, -1
677	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
678	ENDDO
679
680	GOTO 12
681
682	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
683	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
684
685	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
686	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
687
688	12 CLOSE( 90 )
689
690	ENDIF
691	#if defined( __parallel ) && ! defined ( __check )
692	CALL MPI_BARRIER( comm2d, ierr )
693	#endif
694	ENDDO
695
696	!
697	!-- Calculate the index height of the topography
698	DO i = 0, nx
699	DO j = 0, ny
700	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
701	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
702	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
703	nzb_local(j,i) = nzb_local(j,i) + 1
704	ENDDO
705	ENDDO
706
707	DEALLOCATE ( topo_height )
708	!
709	!-- Add cyclic boundaries (additional layers are for calculating
710	!-- flag arrays needed for the multigrid sover)
711	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
712	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
713	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
714	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
715
716	CASE DEFAULT
717	!
718	!-- The DEFAULT case is reached either if the parameter topography
719	!-- contains a wrong character string or if the user has defined a special
720	!-- case in the user interface. There, the subroutine user_init_grid
721	!-- checks which of these two conditions applies.
722	CALL user_init_grid( gls, nzb_local )
723
724	END SELECT
725	!
726	!-- Determine the maximum level of topography. Furthermore it is used for
727	!-- steering the degradation of order of the applied advection scheme.
728	!-- In case of non-cyclic lateral boundaries, the order of the advection
729	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
730	nzb_max = MAXVAL( nzb_local ) + 1
731	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
732	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
733	nzb_max = nzt
734	ENDIF
735
736	!
737	!-- Consistency checks and index array initialization are only required for
738	!-- non-flat topography, also the initialization of topography height arrays
739	!-- zu_s_inner and zw_w_inner
740	IF ( TRIM( topography ) /= 'flat' ) THEN
741
742	!
743	!-- Consistency checks
744	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
745	WRITE( message_string, * ) 'nzb_local values are outside the', &
746	'model domain', &
747	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
748	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
749	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
750	ENDIF
751
752	IF ( bc_lr == 'cyclic' ) THEN
753	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
754	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
755	message_string = 'nzb_local does not fulfill cyclic' // &
756	' boundary condition in x-direction'
757	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
758	ENDIF
759	ENDIF
760	IF ( bc_ns == 'cyclic' ) THEN
761	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
762	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
763	message_string = 'nzb_local does not fulfill cyclic' // &
764	' boundary condition in y-direction'
765	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
766	ENDIF
767	ENDIF
768
769	IF ( topography_grid_convention == 'cell_edge' ) THEN
770	!
771	!-- The array nzb_local as defined using the 'cell_edge' convention
772	!-- describes the actual total size of topography which is defined at the
773	!-- cell edges where u=0 on the topography walls in x-direction and v=0
774	!-- on the topography walls in y-direction. However, PALM uses individual
775	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
776	!-- Therefore, the extent of topography in nzb_local is now reduced by
777	!-- 1dx at the E topography walls and by 1dy at the N topography walls
778	!-- to form the basis for nzb_s_inner.
779	DO j = -gls, ny + gls
780	DO i = -gls, nx
781	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
782	ENDDO
783	ENDDO
784	!-- apply cyclic boundary conditions in x-direction
785	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
786	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
787	DO i = -gls, nx + gls
788	DO j = -gls, ny
789	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
790	ENDDO
791	ENDDO
792	!-- apply cyclic boundary conditions in y-direction
793	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
794	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
795	ENDIF
796
797	!
798	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
799	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
800	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
801
802	!
803	!-- Initialize remaining index arrays:
804	!-- first pre-initialize them with nzb_s_inner...
805	nzb_u_inner = nzb_s_inner
806	nzb_u_outer = nzb_s_inner
807	nzb_v_inner = nzb_s_inner
808	nzb_v_outer = nzb_s_inner
809	nzb_w_outer = nzb_s_inner
810	nzb_s_outer = nzb_s_inner
811
812	!
813	!-- ...then extend pre-initialized arrays in their according directions
814	!-- based on nzb_local using nzb_tmp as a temporary global index array
815
816	!
817	!-- nzb_s_outer:
818	!-- extend nzb_local east-/westwards first, then north-/southwards
819	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
820	DO j = -1, ny + 1
821	DO i = 0, nx
822	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
823	nzb_local(j,i+1) )
824	ENDDO
825	ENDDO
826	DO i = nxl, nxr
827	DO j = nys, nyn
828	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
829	nzb_tmp(j+1,i) )
830	ENDDO
831	!
832	!-- non-cyclic boundary conditions (overwritten by call of
833	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
834	IF ( nys == 0 ) THEN
835	j = -1
836	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
837	ENDIF
838	IF ( nys == ny ) THEN
839	j = ny + 1
840	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
841	ENDIF
842	ENDDO
843	!
844	!-- nzb_w_outer:
845	!-- identical to nzb_s_outer
846	nzb_w_outer = nzb_s_outer
847
848	!
849	!-- nzb_u_inner:
850	!-- extend nzb_local rightwards only
851	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
852	DO j = -1, ny + 1
853	DO i = 0, nx + 1
854	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
855	ENDDO
856	ENDDO
857	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
858
859	!
860	!-- nzb_u_outer:
861	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
862	DO i = nxl, nxr
863	DO j = nys, nyn
864	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
865	nzb_tmp(j+1,i) )
866	ENDDO
867	!
868	!-- non-cyclic boundary conditions (overwritten by call of
869	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
870	IF ( nys == 0 ) THEN
871	j = -1
872	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
873	ENDIF
874	IF ( nys == ny ) THEN
875	j = ny + 1
876	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
877	ENDIF
878	ENDDO
879
880	!
881	!-- nzb_v_inner:
882	!-- extend nzb_local northwards only
883	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
884	DO i = -1, nx + 1
885	DO j = 0, ny + 1
886	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
887	ENDDO
888	ENDDO
889	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
890
891	!
892	!-- nzb_v_outer:
893	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
894	DO j = nys, nyn
895	DO i = nxl, nxr
896	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
897	nzb_tmp(j,i+1) )
898	ENDDO
899	!
900	!-- non-cyclic boundary conditions (overwritten by call of
901	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
902	IF ( nxl == 0 ) THEN
903	i = -1
904	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
905	ENDIF
906	IF ( nxr == nx ) THEN
907	i = nx + 1
908	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
909	ENDIF
910	ENDDO
911	#if ! defined ( __check )
912	!
913	!-- Exchange of lateral boundary values (parallel computers) and cyclic
914	!-- boundary conditions, if applicable.
915	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
916	!-- they do not require exchange and are not included here.
917	CALL exchange_horiz_2d_int( nzb_u_inner )
918	CALL exchange_horiz_2d_int( nzb_u_outer )
919	CALL exchange_horiz_2d_int( nzb_v_inner )
920	CALL exchange_horiz_2d_int( nzb_v_outer )
921	CALL exchange_horiz_2d_int( nzb_w_outer )
922	CALL exchange_horiz_2d_int( nzb_s_outer )
923
924	!
925	!-- Allocate and set the arrays containing the topography height
926	IF ( myid == 0 ) THEN
927
928	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
929
930	DO i = 0, nx + 1
931	DO j = 0, ny + 1
932	zu_s_inner(i,j) = zu(nzb_local(j,i))
933	zw_w_inner(i,j) = zw(nzb_local(j,i))
934	ENDDO
935	ENDDO
936
937	ENDIF
938	!
939	!-- Set flag arrays to be used for masking of grid points
940	DO i = nxlg, nxrg
941	DO j = nysg, nyng
942	DO k = nzb, nzt+1
943	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
944	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
945	ENDDO
946	ENDDO
947	ENDDO
948	#endif
949	ENDIF
950
951	#if ! defined ( __check )
952	!
953	!-- Preliminary: to be removed after completion of the topography code!
954	!-- Set the former default k index arrays nzb_2d
955	nzb_2d = nzb
956
957	!
958	!-- Set the individual index arrays which define the k index from which on
959	!-- the usual finite difference form (which does not use surface fluxes) is
960	!-- applied
961	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
962	nzb_diff_u = nzb_u_inner + 2
963	nzb_diff_v = nzb_v_inner + 2
964	nzb_diff_s_inner = nzb_s_inner + 2
965	nzb_diff_s_outer = nzb_s_outer + 2
966	ELSE
967	nzb_diff_u = nzb_u_inner + 1
968	nzb_diff_v = nzb_v_inner + 1
969	nzb_diff_s_inner = nzb_s_inner + 1
970	nzb_diff_s_outer = nzb_s_outer + 1
971	ENDIF
972
973	!
974	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
975	!-- for limitation of near-wall mixing length l_wall further below
976	corner_nl = 0
977	corner_nr = 0
978	corner_sl = 0
979	corner_sr = 0
980	wall_l = 0
981	wall_n = 0
982	wall_r = 0
983	wall_s = 0
984
985	DO i = nxl, nxr
986	DO j = nys, nyn
987	!
988	!-- u-component
989	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
990	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
991	fym(j,i) = 0.0_wp
992	fyp(j,i) = 1.0_wp
993	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
994	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
995	fym(j,i) = 1.0_wp
996	fyp(j,i) = 0.0_wp
997	ENDIF
998	!
999	!-- v-component
1000	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1001	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1002	fxm(j,i) = 0.0_wp
1003	fxp(j,i) = 1.0_wp
1004	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1005	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1006	fxm(j,i) = 1.0_wp
1007	fxp(j,i) = 0.0_wp
1008	ENDIF
1009	!
1010	!-- w-component, also used for scalars, separate arrays for shear
1011	!-- production of tke
1012	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1013	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1014	wall_w_y(j,i) = 1.0_wp
1015	fwym(j,i) = 0.0_wp
1016	fwyp(j,i) = 1.0_wp
1017	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1018	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1019	wall_w_y(j,i) = 1.0_wp
1020	fwym(j,i) = 1.0_wp
1021	fwyp(j,i) = 0.0_wp
1022	ENDIF
1023	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1024	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1025	wall_w_x(j,i) = 1.0_wp
1026	fwxm(j,i) = 0.0_wp
1027	fwxp(j,i) = 1.0_wp
1028	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1029	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1030	wall_w_x(j,i) = 1.0_wp
1031	fwxm(j,i) = 1.0_wp
1032	fwxp(j,i) = 0.0_wp
1033	ENDIF
1034	!
1035	!-- Wall and corner locations inside buildings for limitation of
1036	!-- near-wall mixing length l_wall
1037	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1038
1039	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1040
1041	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1042	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1043	nzb_s_inner(j,i-1) ) + 1
1044	ENDIF
1045
1046	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1047	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1048	nzb_s_inner(j,i+1) ) + 1
1049	ENDIF
1050
1051	ENDIF
1052
1053	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1054
1055	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1056	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1057	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1058	nzb_s_inner(j,i-1) ) + 1
1059	ENDIF
1060
1061	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1062	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1063	nzb_s_inner(j,i+1) ) + 1
1064	ENDIF
1065
1066	ENDIF
1067
1068	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1069	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1070	ENDIF
1071
1072	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1073	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1074	ENDIF
1075
1076	ENDDO
1077	ENDDO
1078
1079	!
1080	!-- Calculate wall flag arrays for the multigrid method
1081	IF ( psolver(1:9) == 'multigrid' ) THEN
1082	!
1083	!-- Gridpoint increment of the current level
1084	inc = 1
1085
1086	DO l = maximum_grid_level, 1 , -1
1087
1088	nxl_l = nxl_mg(l)
1089	nxr_l = nxr_mg(l)
1090	nys_l = nys_mg(l)
1091	nyn_l = nyn_mg(l)
1092	nzt_l = nzt_mg(l)
1093
1094	!
1095	!-- Assign the flag level to be calculated
1096	SELECT CASE ( l )
1097	CASE ( 1 )
1098	flags => wall_flags_1
1099	CASE ( 2 )
1100	flags => wall_flags_2
1101	CASE ( 3 )
1102	flags => wall_flags_3
1103	CASE ( 4 )
1104	flags => wall_flags_4
1105	CASE ( 5 )
1106	flags => wall_flags_5
1107	CASE ( 6 )
1108	flags => wall_flags_6
1109	CASE ( 7 )
1110	flags => wall_flags_7
1111	CASE ( 8 )
1112	flags => wall_flags_8
1113	CASE ( 9 )
1114	flags => wall_flags_9
1115	CASE ( 10 )
1116	flags => wall_flags_10
1117	END SELECT
1118
1119	!
1120	!-- Depending on the grid level, set the respective bits in case of
1121	!-- neighbouring walls
1122	!-- Bit 0: wall to the bottom
1123	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1124	!-- Bit 2: wall to the south
1125	!-- Bit 3: wall to the north
1126	!-- Bit 4: wall to the left
1127	!-- Bit 5: wall to the right
1128	!-- Bit 6: inside building
1129
1130	flags = 0
1131
1132	!
1133	!-- In case of masking method, flags are not set and multigrid method
1134	!-- works like FFT-solver
1135	IF ( .NOT. masking_method ) THEN
1136
1137	DO i = nxl_l-1, nxr_l+1
1138	DO j = nys_l-1, nyn_l+1
1139	DO k = nzb, nzt_l+1
1140
1141	!
1142	!-- Inside/outside building (inside building does not need
1143	!-- further tests for walls)
1144	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1145
1146	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1147
1148	ELSE
1149	!
1150	!-- Bottom wall
1151	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1152	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1153	ENDIF
1154	!
1155	!-- South wall
1156	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1157	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1158	ENDIF
1159	!
1160	!-- North wall
1161	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1162	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1163	ENDIF
1164	!
1165	!-- Left wall
1166	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1167	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1168	ENDIF
1169	!
1170	!-- Right wall
1171	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1172	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1173	ENDIF
1174
1175	ENDIF
1176
1177	ENDDO
1178	ENDDO
1179	ENDDO
1180
1181	ENDIF
1182
1183	!
1184	!-- Test output of flag arrays
1185	! i = nxl_l
1186	! WRITE (9,*) ' '
1187	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1188	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1189	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1190	! DO k = nzt_l+1, nzb, -1
1191	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1192	! ENDDO
1193
1194	inc = inc * 2
1195
1196	ENDDO
1197
1198	ENDIF
1199	!
1200	!-- Allocate flags needed for masking walls.
1201	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1202	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1203	wall_flags_0 = 0
1204	wall_flags_00 = 0
1205
1206	IF ( scalar_advec == 'ws-scheme' .OR. &
1207	scalar_advec == 'ws-scheme-mono' ) THEN
1208	!
1209	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1210	!-- near topography, inflow- and outflow boundaries as well as bottom and
1211	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1212	!-- grid points.
1213	DO i = nxl, nxr
1214	DO j = nys, nyn
1215	DO k = nzb_s_inner(j,i)+1, nzt
1216	!
1217	!-- scalar - x-direction
1218	!-- WS1 (0), WS3 (1), WS5 (2)
1219	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1220	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1221	.AND. i == nxr ) ) THEN
1222	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1223	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1224	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1225	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1226	) THEN
1227	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1228	ELSE
1229	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1230	ENDIF
1231	!
1232	!-- scalar - y-direction
1233	!-- WS1 (3), WS3 (4), WS5 (5)
1234	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1235	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1236	.AND. j == nyn ) ) THEN
1237	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1238	!-- WS3
1239	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1240	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1241	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1242	) THEN
1243	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1244	!-- WS5
1245	ELSE
1246	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1247	ENDIF
1248	!
1249	!-- scalar - z-direction
1250	!-- WS1 (6), WS3 (7), WS5 (8)
1251	flag_set = .FALSE.
1252	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1253	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1254	flag_set = .TRUE.
1255	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1256	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1257	flag_set = .TRUE.
1258	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1259	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1260	ENDIF
1261	ENDDO
1262	ENDDO
1263	ENDDO
1264	ENDIF
1265
1266	IF ( momentum_advec == 'ws-scheme' ) THEN
1267	!
1268	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1269	!-- near topography, inflow- and outflow boundaries as well as bottom and
1270	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1271	!-- grid points.
1272	DO i = nxl, nxr
1273	DO j = nys, nyn
1274	DO k = nzb+1, nzt
1275	!
1276	!-- At first, set flags to WS1.
1277	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1278	!-- in order to handle the left/south flux.
1279	!-- near vertical walls.
1280	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1281	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1282	!
1283	!-- u component - x-direction
1284	!-- WS1 (9), WS3 (10), WS5 (11)
1285	IF ( k <= nzb_u_inner(j,i+1) &
1286	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
1287	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
1288	) THEN
1289	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1290	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1291	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
1292	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
1293	) THEN
1294	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1295	!
1296	!-- Clear flag for WS1
1297	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1298	ELSE
1299	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1300	!
1301	!-- Clear flag for WS1
1302	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1303	ENDIF
1304	!
1305	!-- u component - y-direction
1306	!-- WS1 (12), WS3 (13), WS5 (14)
1307	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1308	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1309	.AND. j == nyn ) ) THEN
1310	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1311	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1312	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1313	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1314	) THEN
1315	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1316	!
1317	!-- Clear flag for WS1
1318	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1319	ELSE
1320	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1321	!
1322	!-- Clear flag for WS1
1323	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1324	ENDIF
1325	!
1326	!-- u component - z-direction
1327	!-- WS1 (15), WS3 (16), WS5 (17)
1328	flag_set = .FALSE.
1329	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1330	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1331	flag_set = .TRUE.
1332	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1333	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1334	flag_set = .TRUE.
1335	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1336	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1337	ENDIF
1338
1339	ENDDO
1340	ENDDO
1341	ENDDO
1342
1343	DO i = nxl, nxr
1344	DO j = nys, nyn
1345	DO k = nzb+1, nzt
1346	!
1347	!-- At first, set flags to WS1.
1348	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1349	!-- in order to handle the left/south flux.
1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1351	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1352	!
1353	!-- v component - x-direction
1354	!-- WS1 (18), WS3 (19), WS5 (20)
1355	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1356	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
1357	.AND. i == nxr ) ) THEN
1358	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1359	!-- WS3
1360	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1361	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1362	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1363	) THEN
1364	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1365	!
1366	!-- Clear flag for WS1
1367	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1368	ELSE
1369	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1370	!
1371	!-- Clear flag for WS1
1372	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1373	ENDIF
1374	!
1375	!-- v component - y-direction
1376	!-- WS1 (21), WS3 (22), WS5 (23)
1377	IF ( k <= nzb_v_inner(j+1,i) &
1378	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
1379	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
1380	) THEN
1381	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1382	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1383	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
1384	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
1385	) THEN
1386	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1387	!
1388	!-- Clear flag for WS1
1389	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1390	ELSE
1391	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1392	!
1393	!-- Clear flag for WS1
1394	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1395	ENDIF
1396	!
1397	!-- v component - z-direction
1398	!-- WS1 (24), WS3 (25), WS5 (26)
1399	flag_set = .FALSE.
1400	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1401	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1402	flag_set = .TRUE.
1403	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1404	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1405	flag_set = .TRUE.
1406	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1407	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1408	ENDIF
1409
1410	ENDDO
1411	ENDDO
1412	ENDDO
1413	DO i = nxl, nxr
1414	DO j = nys, nyn
1415	DO k = nzb+1, nzt
1416	!
1417	!-- At first, set flags to WS1.
1418	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1419	!-- in order to handle the left/south flux.
1420	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1421	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1422	!
1423	!-- w component - x-direction
1424	!-- WS1 (27), WS3 (28), WS5 (29)
1425	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1426	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1427	.AND. i == nxr ) ) THEN
1428	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1429	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1430	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1431	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1432	) THEN
1433	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1434	!
1435	!-- Clear flag for WS1
1436	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1437	ELSE
1438	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1439	!
1440	!-- Clear flag for WS1
1441	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1442	ENDIF
1443	!
1444	!-- w component - y-direction
1445	!-- WS1 (30), WS3 (31), WS5 (32)
1446	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1447	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1448	.AND. j == nyn ) ) THEN
1449	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1450	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1451	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1452	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1453	) THEN
1454	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1455	!
1456	!-- Clear flag for WS1
1457	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1458	ELSE
1459	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1460	!
1461	!-- Clear flag for WS1
1462	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1463	ENDIF
1464	!
1465	!-- w component - z-direction
1466	!-- WS1 (33), WS3 (34), WS5 (35)
1467	flag_set = .FALSE.
1468	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1469	.OR. k == nzt ) THEN
1470	!
1471	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1472	!-- set, although this is not a prognostic level. However,
1473	!-- contrary to the advection of u,v and s this is necessary
1474	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1475	!-- at k == nzb_w_inner(j,i)+1.
1476	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1477	flag_set = .TRUE.
1478	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1479	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1480	flag_set = .TRUE.
1481	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1482	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1483	ENDIF
1484
1485	ENDDO
1486	ENDDO
1487	ENDDO
1488
1489	ENDIF
1490
1491	!
1492	!-- Exchange 3D integer wall_flags.
1493	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1494	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1495	!
1496	!-- Exchange ghost points for advection flags
1497	CALL exchange_horiz_int( wall_flags_0, nbgp )
1498	CALL exchange_horiz_int( wall_flags_00, nbgp )
1499	!
1500	!-- Set boundary flags at inflow and outflow boundary in case of
1501	!-- non-cyclic boundary conditions.
1502	IF ( inflow_l .OR. outflow_l ) THEN
1503	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1504	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1505	ENDIF
1506
1507	IF ( inflow_r .OR. outflow_r ) THEN
1508	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1509	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1510	ENDIF
1511
1512	IF ( inflow_n .OR. outflow_n ) THEN
1513	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1514	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1515	ENDIF
1516
1517	IF ( inflow_s .OR. outflow_s ) THEN
1518	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1519	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1520	ENDIF
1521
1522	ENDIF
1523
1524	!
1525	!-- In case of topography: limit near-wall mixing length l_wall further:
1526	!-- Go through all points of the subdomain one by one and look for the closest
1527	!-- surface
1528	IF ( TRIM(topography) /= 'flat' ) THEN
1529	DO i = nxl, nxr
1530	DO j = nys, nyn
1531
1532	nzb_si = nzb_s_inner(j,i)
1533	vi = vertical_influence(nzb_si)
1534
1535	IF ( wall_n(j,i) > 0 ) THEN
1536	!
1537	!-- North wall (y distance)
1538	DO k = wall_n(j,i), nzb_si
1539	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1540	ENDDO
1541	!
1542	!-- Above North wall (yz distance)
1543	DO k = nzb_si + 1, nzb_si + vi
1544	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1545	SQRT( 0.25_wp * dy**2 + &
1546	( zu(k) - zw(nzb_si) )**2 ) )
1547	ENDDO
1548	!
1549	!-- Northleft corner (xy distance)
1550	IF ( corner_nl(j,i) > 0 ) THEN
1551	DO k = corner_nl(j,i), nzb_si
1552	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1553	0.5_wp * SQRT( dx2 + dy2 ) )
1554	ENDDO
1555	!
1556	!-- Above Northleft corner (xyz distance)
1557	DO k = nzb_si + 1, nzb_si + vi
1558	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1559	SQRT( 0.25_wp * (dx2 + dy2) + &
1560	( zu(k) - zw(nzb_si) )**2 ) )
1561	ENDDO
1562	ENDIF
1563	!
1564	!-- Northright corner (xy distance)
1565	IF ( corner_nr(j,i) > 0 ) THEN
1566	DO k = corner_nr(j,i), nzb_si
1567	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1568	0.5_wp * SQRT( dx2 + dy2 ) )
1569	ENDDO
1570	!
1571	!-- Above northright corner (xyz distance)
1572	DO k = nzb_si + 1, nzb_si + vi
1573	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1574	SQRT( 0.25_wp * (dx2 + dy2) + &
1575	( zu(k) - zw(nzb_si) )**2 ) )
1576	ENDDO
1577	ENDIF
1578	ENDIF
1579
1580	IF ( wall_s(j,i) > 0 ) THEN
1581	!
1582	!-- South wall (y distance)
1583	DO k = wall_s(j,i), nzb_si
1584	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1585	ENDDO
1586	!
1587	!-- Above south wall (yz distance)
1588	DO k = nzb_si + 1, nzb_si + vi
1589	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1590	SQRT( 0.25_wp * dy**2 + &
1591	( zu(k) - zw(nzb_si) )**2 ) )
1592	ENDDO
1593	!
1594	!-- Southleft corner (xy distance)
1595	IF ( corner_sl(j,i) > 0 ) THEN
1596	DO k = corner_sl(j,i), nzb_si
1597	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1598	0.5_wp * SQRT( dx2 + dy2 ) )
1599	ENDDO
1600	!
1601	!-- Above southleft corner (xyz distance)
1602	DO k = nzb_si + 1, nzb_si + vi
1603	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1604	SQRT( 0.25_wp * (dx2 + dy2) + &
1605	( zu(k) - zw(nzb_si) )**2 ) )
1606	ENDDO
1607	ENDIF
1608	!
1609	!-- Southright corner (xy distance)
1610	IF ( corner_sr(j,i) > 0 ) THEN
1611	DO k = corner_sr(j,i), nzb_si
1612	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1613	0.5_wp * SQRT( dx2 + dy2 ) )
1614	ENDDO
1615	!
1616	!-- Above southright corner (xyz distance)
1617	DO k = nzb_si + 1, nzb_si + vi
1618	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1619	SQRT( 0.25_wp * (dx2 + dy2) + &
1620	( zu(k) - zw(nzb_si) )**2 ) )
1621	ENDDO
1622	ENDIF
1623
1624	ENDIF
1625
1626	IF ( wall_l(j,i) > 0 ) THEN
1627	!
1628	!-- Left wall (x distance)
1629	DO k = wall_l(j,i), nzb_si
1630	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1631	ENDDO
1632	!
1633	!-- Above left wall (xz distance)
1634	DO k = nzb_si + 1, nzb_si + vi
1635	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1636	SQRT( 0.25_wp * dx**2 + &
1637	( zu(k) - zw(nzb_si) )**2 ) )
1638	ENDDO
1639	ENDIF
1640
1641	IF ( wall_r(j,i) > 0 ) THEN
1642	!
1643	!-- Right wall (x distance)
1644	DO k = wall_r(j,i), nzb_si
1645	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1646	ENDDO
1647	!
1648	!-- Above right wall (xz distance)
1649	DO k = nzb_si + 1, nzb_si + vi
1650	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1651	SQRT( 0.25_wp * dx**2 + &
1652	( zu(k) - zw(nzb_si) )**2 ) )
1653	ENDDO
1654
1655	ENDIF
1656
1657	ENDDO
1658	ENDDO
1659
1660	ENDIF
1661
1662	!
1663	!-- Multiplication with wall_adjustment_factor
1664	l_wall = wall_adjustment_factor * l_wall
1665
1666	!
1667	!-- Set lateral boundary conditions for l_wall
1668	CALL exchange_horiz( l_wall, nbgp )
1669
1670	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1671	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1672
1673	#endif
1674
1675	END SUBROUTINE init_grid

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