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source: palm/trunk/SOURCE/init_grid.f90 @ 1762

Last change on this file since 1762 was 1762, checked in by hellstea, 8 years ago
Introduction of nested domain system
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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	! Introduction of nested domain feature
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_grid.f90 1762 2016-02-25 12:31:13Z hellstea $
26	!
27	! 1743 2016-01-13 10:23:51Z raasch
28	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
29	! total domain
30	!
31	! 1691 2015-10-26 16:17:44Z maronga
32	! Renamed prandtl_layer to constant_flux_layer.
33	!
34	! 1682 2015-10-07 23:56:08Z knoop
35	! Code annotations made doxygen readable
36	!
37	! 1677 2015-10-02 13:25:23Z boeske
38	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
39	!
40	! 1675 2015-10-02 08:28:59Z gronemeier
41	! Bugfix: Definition of topography grid levels
42	!
43	! 1660 2015-09-21 08:15:16Z gronemeier
44	! Bugfix: Definition of topography grid levels if vertical grid stretching
45	! starts below the maximum topography height.
46	!
47	! 1580 2015-04-10 13:43:49Z suehring
48	! Bugfix: setting flags for 5th order scheme near buildings
49	!
50	! 1575 2015-03-27 09:56:27Z raasch
51	! adjustments for psolver-queries
52	!
53	! 1557 2015-03-05 16:43:04Z suehring
54	! Adjustment for monotoinic limiter
55	!
56	! 1418 2014-06-06 13:05:08Z fricke
57	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
58	! condition and a negative value for dz_stretch_level the condition
59	! was always true for the whole model domain
60	!
61	! 1409 2014-05-23 12:11:32Z suehring
62	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
63	! j <= nysv
64	!
65	! 1353 2014-04-08 15:21:23Z heinze
66	! REAL constants provided with KIND-attribute
67	!
68	! 1322 2014-03-20 16:38:49Z raasch
69	! REAL constants defined as wp-kind
70	!
71	! 1320 2014-03-20 08:40:49Z raasch
72	! ONLY-attribute added to USE-statements,
73	! kind-parameters added to all INTEGER and REAL declaration statements,
74	! kinds are defined in new module kinds,
75	! revision history before 2012 removed,
76	! comment fields (!:) to be used for variable explanations added to
77	! all variable declaration statements
78	!
79	! 1221 2013-09-10 08:59:13Z raasch
80	! wall_flags_00 introduced to hold bits 32-63,
81	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
82	! loops optimized for openACC (pres + flow_statistics)
83	!
84	! 1092 2013-02-02 11:24:22Z raasch
85	! unused variables removed
86	!
87	! 1069 2012-11-28 16:18:43Z maronga
88	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
89	! model in case of coupled runs
90	!
91	! 1036 2012-10-22 13:43:42Z raasch
92	! code put under GPL (PALM 3.9)
93	!
94	! 1015 2012-09-27 09:23:24Z raasch
95	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
96	! nzb_w_inner+1
97	!
98	! 996 2012-09-07 10:41:47Z raasch
99	! little reformatting
100	!
101	! 978 2012-08-09 08:28:32Z fricke
102	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
103	! Bugfix: Set wall_flags_0 for inflow boundary
104	!
105	! 927 2012-06-06 19:15:04Z raasch
106	! Wall flags are not set for multigrid method in case of masking method
107	!
108	! 864 2012-03-27 15:10:33Z gryschka
109	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
110	! were not correctly defined for k=1.
111	!
112	! 861 2012-03-26 14:18:34Z suehring
113	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
114	! inflow and outflow boundaries as well as near the bottom and the top of the
115	! model domain.!
116	! Initialization of nzb_s_inner and nzb_w_inner.
117	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
118	! while setting wall_flags_0
119	!
120	! 843 2012-02-29 15:16:21Z gryschka
121	! In case of ocean and dirichlet bc for u and v at the bottom
122	! the first u-level ist defined at same height as the first w-level
123	!
124	! 818 2012-02-08 16:11:23Z maronga
125	! Bugfix: topo_height is only required if topography is used. It is thus now
126	! allocated in the topography branch
127	!
128	! 809 2012-01-30 13:32:58Z maronga
129	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
130	!
131	! 807 2012-01-25 11:53:51Z maronga
132	! New cpp directive "__check" implemented which is used by check_namelist_files
133	!
134	! Revision 1.1 1997/08/11 06:17:45 raasch
135	! Initial revision (Testversion)
136	!
137	!
138	! Description:
139	! ------------
140	!> Creating grid depending constants
141	!------------------------------------------------------------------------------!
142	SUBROUTINE init_grid
143
144
145	USE arrays_3d, &
146	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
147	f2_mg, f3_mg, l_grid, l_wall, zu, zw
148
149	USE control_parameters, &
150	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
151	building_length_y, building_wall_left, building_wall_south, &
152	canyon_height, canyon_wall_left, canyon_wall_south, &
153	canyon_width_x, canyon_width_y, constant_flux_layer, &
154	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
155	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
156	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
157	masking_method, maximum_grid_level, message_string, &
158	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
159	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
160	outflow_r, outflow_s, psolver, scalar_advec, topography, &
161	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
162	wall_adjustment_factor
163
164	USE grid_variables, &
165	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
166	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
167	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
168
169	USE indices, &
170	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
171	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
172	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
173	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
174	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
175	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
176	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
177	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
178	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
179	wall_flags_9
180
181	USE kinds
182
183	USE pegrid
184
185	IMPLICIT NONE
186
187	INTEGER(iwp) :: bh !<
188	INTEGER(iwp) :: blx !<
189	INTEGER(iwp) :: bly !<
190	INTEGER(iwp) :: bxl !<
191	INTEGER(iwp) :: bxr !<
192	INTEGER(iwp) :: byn !<
193	INTEGER(iwp) :: bys !<
194	INTEGER(iwp) :: ch !<
195	INTEGER(iwp) :: cwx !<
196	INTEGER(iwp) :: cwy !<
197	INTEGER(iwp) :: cxl !<
198	INTEGER(iwp) :: cxr !<
199	INTEGER(iwp) :: cyn !<
200	INTEGER(iwp) :: cys !<
201	INTEGER(iwp) :: gls !<
202	INTEGER(iwp) :: i !<
203	INTEGER(iwp) :: ii !<
204	INTEGER(iwp) :: inc !<
205	INTEGER(iwp) :: j !<
206	INTEGER(iwp) :: k !<
207	INTEGER(iwp) :: l !<
208	INTEGER(iwp) :: nxl_l !<
209	INTEGER(iwp) :: nxr_l !<
210	INTEGER(iwp) :: nyn_l !<
211	INTEGER(iwp) :: nys_l !<
212	INTEGER(iwp) :: nzb_si !<
213	INTEGER(iwp) :: nzt_l !<
214	INTEGER(iwp) :: vi !<
215
216	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
217
218	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
219	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
220	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
221	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
222	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
223	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
224	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
225	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
226	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
227	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
228
229	LOGICAL :: flag_set = .FALSE. !<
230
231	REAL(wp) :: dx_l !<
232	REAL(wp) :: dy_l !<
233	REAL(wp) :: dz_stretched !<
234
235	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
236
237
238	!
239	!-- Calculation of horizontal array bounds including ghost layers
240	nxlg = nxl - nbgp
241	nxrg = nxr + nbgp
242	nysg = nys - nbgp
243	nyng = nyn + nbgp
244
245	!
246	!-- Allocate grid arrays
247	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
248	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
249
250	!
251	!-- Compute height of u-levels from constant grid length and dz stretch factors
252	IF ( dz == -1.0_wp ) THEN
253	message_string = 'missing dz'
254	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
255	ELSEIF ( dz <= 0.0_wp ) THEN
256	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
257	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
258	ENDIF
259
260	!
261	!-- Define the vertical grid levels
262	IF ( .NOT. ocean ) THEN
263	!
264	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
265	!-- The second u-level (k=1) corresponds to the top of the
266	!-- Prandtl-layer.
267
268	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
269	zu(0) = 0.0_wp
270	! zu(0) = - dz * 0.5_wp
271	ELSE
272	zu(0) = - dz * 0.5_wp
273	ENDIF
274	zu(1) = dz * 0.5_wp
275
276	dz_stretch_level_index = nzt+1
277	dz_stretched = dz
278	DO k = 2, nzt+1
279	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
280	dz_stretched = dz_stretched * dz_stretch_factor
281	dz_stretched = MIN( dz_stretched, dz_max )
282	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
283	ENDIF
284	zu(k) = zu(k-1) + dz_stretched
285	ENDDO
286
287	!
288	!-- Compute the w-levels. They are always staggered half-way between the
289	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
290	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
291	!-- The top w-level is extrapolated linearly.
292	zw(0) = 0.0_wp
293	DO k = 1, nzt
294	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
295	ENDDO
296	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
297
298	ELSE
299	!
300	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
301	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
302	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
303	!-- w-level are defined at same height, but staggered from the second level.
304	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
305	zu(nzt+1) = dz * 0.5_wp
306	zu(nzt) = - dz * 0.5_wp
307
308	dz_stretch_level_index = 0
309	dz_stretched = dz
310	DO k = nzt-1, 0, -1
311	!
312	!-- The default value of dz_stretch_level is positive, thus the first
313	!-- condition is always true. Hence, the second condition is necessary.
314	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
315	.AND. dz_stretched < dz_max ) THEN
316	dz_stretched = dz_stretched * dz_stretch_factor
317	dz_stretched = MIN( dz_stretched, dz_max )
318	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
319	ENDIF
320	zu(k) = zu(k+1) - dz_stretched
321	ENDDO
322
323	!
324	!-- Compute the w-levels. They are always staggered half-way between the
325	!-- corresponding u-levels, except in case of dirichlet bc for u and v
326	!-- at the ground. In this case the first u- and w-level are defined at
327	!-- same height. The top w-level (nzt+1) is not used but set for
328	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
329	zw(nzt+1) = dz
330	zw(nzt) = 0.0_wp
331	DO k = 0, nzt
332	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
333	ENDDO
334
335	!
336	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
337	!-- at same height.
338	IF ( ibc_uv_b == 0 ) THEN
339	zu(0) = zw(0)
340	ENDIF
341
342	ENDIF
343
344	!
345	!-- Compute grid lengths.
346	DO k = 1, nzt+1
347	dzu(k) = zu(k) - zu(k-1)
348	ddzu(k) = 1.0_wp / dzu(k)
349	dzw(k) = zw(k) - zw(k-1)
350	ddzw(k) = 1.0_wp / dzw(k)
351	ENDDO
352
353	DO k = 1, nzt
354	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
355	ENDDO
356
357	!
358	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
359	!-- everywhere. For the actual grid, the grid spacing at the lowest level
360	!-- is only dz/2, but should be dz. Therefore, an additional array
361	!-- containing with appropriate grid information is created for these
362	!-- solvers.
363	IF ( psolver(1:9) /= 'multigrid' ) THEN
364	ALLOCATE( ddzu_pres(1:nzt+1) )
365	ddzu_pres = ddzu
366	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
367	ENDIF
368
369	!
370	!-- In case of multigrid method, compute grid lengths and grid factors for the
371	!-- grid levels
372	IF ( psolver(1:9) == 'multigrid' ) THEN
373
374	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
375	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
376	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
377	f1_mg(nzb+1:nzt,maximum_grid_level), &
378	f2_mg(nzb+1:nzt,maximum_grid_level), &
379	f3_mg(nzb+1:nzt,maximum_grid_level) )
380
381	dzu_mg(:,maximum_grid_level) = dzu
382	!
383	!-- Next line to ensure an equally spaced grid.
384	dzu_mg(1,maximum_grid_level) = dzu(2)
385
386	dzw_mg(:,maximum_grid_level) = dzw
387	nzt_l = nzt
388	DO l = maximum_grid_level-1, 1, -1
389	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
390	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
391	nzt_l = nzt_l / 2
392	DO k = 2, nzt_l+1
393	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
394	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
395	ENDDO
396	ENDDO
397
398	nzt_l = nzt
399	dx_l = dx
400	dy_l = dy
401	DO l = maximum_grid_level, 1, -1
402	ddx2_mg(l) = 1.0_wp / dx_l**2
403	ddy2_mg(l) = 1.0_wp / dy_l**2
404	DO k = nzb+1, nzt_l
405	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
406	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
407	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
408	f2_mg(k,l) + f3_mg(k,l)
409	ENDDO
410	nzt_l = nzt_l / 2
411	dx_l = dx_l * 2.0_wp
412	dy_l = dy_l * 2.0_wp
413	ENDDO
414
415	ENDIF
416
417	!
418	!-- Compute the reciprocal values of the horizontal grid lengths.
419	ddx = 1.0_wp / dx
420	ddy = 1.0_wp / dy
421	dx2 = dx * dx
422	dy2 = dy * dy
423	ddx2 = 1.0_wp / dx2
424	ddy2 = 1.0_wp / dy2
425
426	!
427	!-- Compute the grid-dependent mixing length.
428	DO k = 1, nzt
429	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
430	ENDDO
431
432	!
433	!-- Allocate outer and inner index arrays for topography and set
434	!-- defaults.
435	!-- nzb_local has to contain additional layers of ghost points for calculating
436	!-- the flag arrays needed for the multigrid method
437	gls = 2**( maximum_grid_level )
438	IF ( gls < nbgp ) gls = nbgp
439
440	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
441	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
442	nzb_local(-gls:ny+gls,-gls:nx+gls), &
443	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
444	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
445	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
446	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
447	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
448	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
449	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
450	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
451	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
452	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
453	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
454	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
455	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
456	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
457	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
458	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
459	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
460	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
461	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
462	nzb_2d(nysg:nyng,nxlg:nxrg), &
463	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
464	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
465	wall_e_x(nysg:nyng,nxlg:nxrg), &
466	wall_e_y(nysg:nyng,nxlg:nxrg), &
467	wall_u(nysg:nyng,nxlg:nxrg), &
468	wall_v(nysg:nyng,nxlg:nxrg), &
469	wall_w_x(nysg:nyng,nxlg:nxrg), &
470	wall_w_y(nysg:nyng,nxlg:nxrg) )
471
472
473
474	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
475
476
477	nzb_s_inner = nzb; nzb_s_outer = nzb
478	nzb_u_inner = nzb; nzb_u_outer = nzb
479	nzb_v_inner = nzb; nzb_v_outer = nzb
480	nzb_w_inner = nzb; nzb_w_outer = nzb
481
482	rflags_s_inner = 1.0_wp
483	rflags_invers = 1.0_wp
484
485	!
486	!-- Define vertical gridpoint from (or to) which on the usual finite difference
487	!-- form (which does not use surface fluxes) is applied
488	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
489	nzb_diff = nzb + 2
490	ELSE
491	nzb_diff = nzb + 1
492	ENDIF
493	IF ( use_top_fluxes ) THEN
494	nzt_diff = nzt - 1
495	ELSE
496	nzt_diff = nzt
497	ENDIF
498
499	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
500	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
501
502	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
503	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
504	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
505	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
506
507	!
508	!-- Initialize near-wall mixing length l_wall only in the vertical direction
509	!-- for the moment,
510	!-- multiplication with wall_adjustment_factor near the end of this routine
511	l_wall(nzb,:,:) = l_grid(1)
512	DO k = nzb+1, nzt
513	l_wall(k,:,:) = l_grid(k)
514	ENDDO
515	l_wall(nzt+1,:,:) = l_grid(nzt)
516
517	ALLOCATE ( vertical_influence(nzb:nzt) )
518	DO k = 1, nzt
519	vertical_influence(k) = MIN ( INT( l_grid(k) / &
520	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
521	ENDDO
522
523	DO k = 1, MAXVAL( nzb_s_inner )
524	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
525	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
526	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
527	'threshold given by only local', &
528	' &horizontal reduction of near_wall ', &
529	'mixing length l_wall', &
530	' &starting from height level k = ', k, '.'
531	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
532	EXIT
533	ENDIF
534	ENDDO
535	vertical_influence(0) = vertical_influence(1)
536
537	DO i = nxlg, nxrg
538	DO j = nysg, nyng
539	DO k = nzb_s_inner(j,i) + 1, &
540	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
541	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
542	ENDDO
543	ENDDO
544	ENDDO
545
546	!
547	!-- Set outer and inner index arrays for non-flat topography.
548	!-- Here consistency checks concerning domain size and periodicity are
549	!-- necessary.
550	!-- Within this SELECT CASE structure only nzb_local is initialized
551	!-- individually depending on the chosen topography type, all other index
552	!-- arrays are initialized further below.
553	SELECT CASE ( TRIM( topography ) )
554
555	CASE ( 'flat' )
556	!
557	!-- nzb_local is required for the multigrid solver
558	nzb_local = 0
559
560	CASE ( 'single_building' )
561	!
562	!-- Single rectangular building, by default centered in the middle of the
563	!-- total domain
564	blx = NINT( building_length_x / dx )
565	bly = NINT( building_length_y / dy )
566	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
567	IF ( ABS( zw(bh ) - building_height ) == &
568	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
569
570	IF ( building_wall_left == 9999999.9_wp ) THEN
571	building_wall_left = ( nx + 1 - blx ) / 2 * dx
572	ENDIF
573	bxl = NINT( building_wall_left / dx )
574	bxr = bxl + blx
575
576	IF ( building_wall_south == 9999999.9_wp ) THEN
577	building_wall_south = ( ny + 1 - bly ) / 2 * dy
578	ENDIF
579	bys = NINT( building_wall_south / dy )
580	byn = bys + bly
581
582	!
583	!-- Building size has to meet some requirements
584	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
585	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
586	WRITE( message_string, * ) 'inconsistent building parameters:', &
587	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
588	'byn=', byn, 'nx=', nx, 'ny=', ny
589	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
590	ENDIF
591
592	!
593	!-- Define the building.
594	nzb_local = 0
595	nzb_local(bys:byn,bxl:bxr) = bh
596
597	CASE ( 'single_street_canyon' )
598	!
599	!-- Single quasi-2D street canyon of infinite length in x or y direction.
600	!-- The canyon is centered in the other direction by default.
601	IF ( canyon_width_x /= 9999999.9_wp ) THEN
602	!
603	!-- Street canyon in y direction
604	cwx = NINT( canyon_width_x / dx )
605	IF ( canyon_wall_left == 9999999.9_wp ) THEN
606	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
607	ENDIF
608	cxl = NINT( canyon_wall_left / dx )
609	cxr = cxl + cwx
610
611	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
612	!
613	!-- Street canyon in x direction
614	cwy = NINT( canyon_width_y / dy )
615	IF ( canyon_wall_south == 9999999.9_wp ) THEN
616	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
617	ENDIF
618	cys = NINT( canyon_wall_south / dy )
619	cyn = cys + cwy
620
621	ELSE
622
623	message_string = 'no street canyon width given'
624	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
625
626	ENDIF
627
628	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
629	IF ( ABS( zw(ch ) - canyon_height ) == &
630	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
631
632	dp_level_ind_b = ch
633	!
634	!-- Street canyon size has to meet some requirements
635	IF ( canyon_width_x /= 9999999.9_wp ) THEN
636	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
637	( ch < 3 ) ) THEN
638	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
639	'&cxl=', cxl, 'cxr=', cxr, &
640	'cwx=', cwx, &
641	'ch=', ch, 'nx=', nx, 'ny=', ny
642	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
643	ENDIF
644	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
645	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
646	( ch < 3 ) ) THEN
647	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
648	'&cys=', cys, 'cyn=', cyn, &
649	'cwy=', cwy, &
650	'ch=', ch, 'nx=', nx, 'ny=', ny
651	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
652	ENDIF
653	ENDIF
654	IF ( canyon_width_x /= 9999999.9_wp .AND. &
655	canyon_width_y /= 9999999.9_wp ) THEN
656	message_string = 'inconsistent canyon parameters:' // &
657	'&street canyon can only be oriented' // &
658	'&either in x- or in y-direction'
659	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
660	ENDIF
661
662	nzb_local = ch
663	IF ( canyon_width_x /= 9999999.9_wp ) THEN
664	nzb_local(:,cxl+1:cxr-1) = 0
665	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
666	nzb_local(cys+1:cyn-1,:) = 0
667	ENDIF
668
669	CASE ( 'read_from_file' )
670
671	ALLOCATE ( topo_height(0:ny,0:nx) )
672
673	DO ii = 0, io_blocks-1
674	IF ( ii == io_group ) THEN
675
676	!
677	!-- Arbitrary irregular topography data in PALM format (exactly
678	!-- matching the grid size and total domain size)
679	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
680	FORM='FORMATTED', ERR=10 )
681	DO j = ny, 0, -1
682	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
683	ENDDO
684
685	GOTO 12
686
687	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
688	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
689
690	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
691	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
692
693	12 CLOSE( 90 )
694
695	ENDIF
696	#if defined( __parallel ) && ! defined ( __check )
697	CALL MPI_BARRIER( comm2d, ierr )
698	#endif
699	ENDDO
700
701	!
702	!-- Calculate the index height of the topography
703	DO i = 0, nx
704	DO j = 0, ny
705	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
706	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
707	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
708	nzb_local(j,i) = nzb_local(j,i) + 1
709	ENDDO
710	ENDDO
711
712	DEALLOCATE ( topo_height )
713	!
714	!-- Add cyclic boundaries (additional layers are for calculating
715	!-- flag arrays needed for the multigrid sover)
716	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
717	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
718	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
719	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
720
721	CASE DEFAULT
722	!
723	!-- The DEFAULT case is reached either if the parameter topography
724	!-- contains a wrong character string or if the user has defined a special
725	!-- case in the user interface. There, the subroutine user_init_grid
726	!-- checks which of these two conditions applies.
727	CALL user_init_grid( gls, nzb_local )
728
729	END SELECT
730	!
731	!-- Determine the maximum level of topography. Furthermore it is used for
732	!-- steering the degradation of order of the applied advection scheme.
733	!-- In case of non-cyclic lateral boundaries, the order of the advection
734	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
735	nzb_max = MAXVAL( nzb_local ) + 1
736	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
737	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
738	nest_domain ) &
739	THEN
740	nzb_max = nzt
741	ENDIF
742
743	!
744	!-- Consistency checks and index array initialization are only required for
745	!-- non-flat topography, also the initialization of topography height arrays
746	!-- zu_s_inner and zw_w_inner
747	IF ( TRIM( topography ) /= 'flat' ) THEN
748
749	!
750	!-- Consistency checks
751	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
752	WRITE( message_string, * ) 'nzb_local values are outside the', &
753	'model domain', &
754	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
755	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
756	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
757	ENDIF
758
759	IF ( bc_lr == 'cyclic' ) THEN
760	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
761	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
762	message_string = 'nzb_local does not fulfill cyclic' // &
763	' boundary condition in x-direction'
764	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
765	ENDIF
766	ENDIF
767	IF ( bc_ns == 'cyclic' ) THEN
768	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
769	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
770	message_string = 'nzb_local does not fulfill cyclic' // &
771	' boundary condition in y-direction'
772	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
773	ENDIF
774	ENDIF
775
776	IF ( topography_grid_convention == 'cell_edge' ) THEN
777	!
778	!-- The array nzb_local as defined using the 'cell_edge' convention
779	!-- describes the actual total size of topography which is defined at the
780	!-- cell edges where u=0 on the topography walls in x-direction and v=0
781	!-- on the topography walls in y-direction. However, PALM uses individual
782	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
783	!-- Therefore, the extent of topography in nzb_local is now reduced by
784	!-- 1dx at the E topography walls and by 1dy at the N topography walls
785	!-- to form the basis for nzb_s_inner.
786	DO j = -gls, ny + gls
787	DO i = -gls, nx
788	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
789	ENDDO
790	ENDDO
791	!-- apply cyclic boundary conditions in x-direction
792	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
793	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
794	DO i = -gls, nx + gls
795	DO j = -gls, ny
796	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
797	ENDDO
798	ENDDO
799	!-- apply cyclic boundary conditions in y-direction
800	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
801	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
802	ENDIF
803
804	!
805	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
806	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
807	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
808
809	!
810	!-- Initialize remaining index arrays:
811	!-- first pre-initialize them with nzb_s_inner...
812	nzb_u_inner = nzb_s_inner
813	nzb_u_outer = nzb_s_inner
814	nzb_v_inner = nzb_s_inner
815	nzb_v_outer = nzb_s_inner
816	nzb_w_outer = nzb_s_inner
817	nzb_s_outer = nzb_s_inner
818
819	!
820	!-- ...then extend pre-initialized arrays in their according directions
821	!-- based on nzb_local using nzb_tmp as a temporary global index array
822
823	!
824	!-- nzb_s_outer:
825	!-- extend nzb_local east-/westwards first, then north-/southwards
826	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
827	DO j = -1, ny + 1
828	DO i = 0, nx
829	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
830	nzb_local(j,i+1) )
831	ENDDO
832	ENDDO
833	DO i = nxl, nxr
834	DO j = nys, nyn
835	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
836	nzb_tmp(j+1,i) )
837	ENDDO
838	!
839	!-- non-cyclic boundary conditions (overwritten by call of
840	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
841	IF ( nys == 0 ) THEN
842	j = -1
843	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
844	ENDIF
845	IF ( nyn == ny ) THEN
846	j = ny + 1
847	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
848	ENDIF
849	ENDDO
850	!
851	!-- nzb_w_outer:
852	!-- identical to nzb_s_outer
853	nzb_w_outer = nzb_s_outer
854
855	!
856	!-- nzb_u_inner:
857	!-- extend nzb_local rightwards only
858	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
859	DO j = -1, ny + 1
860	DO i = 0, nx + 1
861	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
862	ENDDO
863	ENDDO
864	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
865
866	!
867	!-- nzb_u_outer:
868	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
869	DO i = nxl, nxr
870	DO j = nys, nyn
871	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
872	nzb_tmp(j+1,i) )
873	ENDDO
874	!
875	!-- non-cyclic boundary conditions (overwritten by call of
876	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
877	IF ( nys == 0 ) THEN
878	j = -1
879	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
880	ENDIF
881	IF ( nyn == ny ) THEN
882	j = ny + 1
883	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
884	ENDIF
885	ENDDO
886
887	!
888	!-- nzb_v_inner:
889	!-- extend nzb_local northwards only
890	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
891	DO i = -1, nx + 1
892	DO j = 0, ny + 1
893	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
894	ENDDO
895	ENDDO
896	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
897
898	!
899	!-- nzb_v_outer:
900	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
901	DO j = nys, nyn
902	DO i = nxl, nxr
903	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
904	nzb_tmp(j,i+1) )
905	ENDDO
906	!
907	!-- non-cyclic boundary conditions (overwritten by call of
908	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
909	IF ( nxl == 0 ) THEN
910	i = -1
911	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
912	ENDIF
913	IF ( nxr == nx ) THEN
914	i = nx + 1
915	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
916	ENDIF
917	ENDDO
918	#if ! defined ( __check )
919	!
920	!-- Exchange of lateral boundary values (parallel computers) and cyclic
921	!-- boundary conditions, if applicable.
922	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
923	!-- they do not require exchange and are not included here.
924	CALL exchange_horiz_2d_int( nzb_u_inner )
925	CALL exchange_horiz_2d_int( nzb_u_outer )
926	CALL exchange_horiz_2d_int( nzb_v_inner )
927	CALL exchange_horiz_2d_int( nzb_v_outer )
928	CALL exchange_horiz_2d_int( nzb_w_outer )
929	CALL exchange_horiz_2d_int( nzb_s_outer )
930
931	!
932	!-- Allocate and set the arrays containing the topography height
933	IF ( myid == 0 ) THEN
934
935	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
936
937	DO i = 0, nx + 1
938	DO j = 0, ny + 1
939	zu_s_inner(i,j) = zu(nzb_local(j,i))
940	zw_w_inner(i,j) = zw(nzb_local(j,i))
941	ENDDO
942	ENDDO
943
944	ENDIF
945	!
946	!-- Set flag arrays to be used for masking of grid points
947	DO i = nxlg, nxrg
948	DO j = nysg, nyng
949	DO k = nzb, nzt+1
950	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
951	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
952	ENDDO
953	ENDDO
954	ENDDO
955	#endif
956	ENDIF
957
958	#if ! defined ( __check )
959	!
960	!-- Preliminary: to be removed after completion of the topography code!
961	!-- Set the former default k index arrays nzb_2d
962	nzb_2d = nzb
963
964	!
965	!-- Set the individual index arrays which define the k index from which on
966	!-- the usual finite difference form (which does not use surface fluxes) is
967	!-- applied
968	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
969	nzb_diff_u = nzb_u_inner + 2
970	nzb_diff_v = nzb_v_inner + 2
971	nzb_diff_s_inner = nzb_s_inner + 2
972	nzb_diff_s_outer = nzb_s_outer + 2
973	ELSE
974	nzb_diff_u = nzb_u_inner + 1
975	nzb_diff_v = nzb_v_inner + 1
976	nzb_diff_s_inner = nzb_s_inner + 1
977	nzb_diff_s_outer = nzb_s_outer + 1
978	ENDIF
979
980	!
981	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
982	!-- for limitation of near-wall mixing length l_wall further below
983	corner_nl = 0
984	corner_nr = 0
985	corner_sl = 0
986	corner_sr = 0
987	wall_l = 0
988	wall_n = 0
989	wall_r = 0
990	wall_s = 0
991
992	DO i = nxl, nxr
993	DO j = nys, nyn
994	!
995	!-- u-component
996	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
997	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
998	fym(j,i) = 0.0_wp
999	fyp(j,i) = 1.0_wp
1000	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
1001	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
1002	fym(j,i) = 1.0_wp
1003	fyp(j,i) = 0.0_wp
1004	ENDIF
1005	!
1006	!-- v-component
1007	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1008	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1009	fxm(j,i) = 0.0_wp
1010	fxp(j,i) = 1.0_wp
1011	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1012	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1013	fxm(j,i) = 1.0_wp
1014	fxp(j,i) = 0.0_wp
1015	ENDIF
1016	!
1017	!-- w-component, also used for scalars, separate arrays for shear
1018	!-- production of tke
1019	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1020	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1021	wall_w_y(j,i) = 1.0_wp
1022	fwym(j,i) = 0.0_wp
1023	fwyp(j,i) = 1.0_wp
1024	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1025	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1026	wall_w_y(j,i) = 1.0_wp
1027	fwym(j,i) = 1.0_wp
1028	fwyp(j,i) = 0.0_wp
1029	ENDIF
1030	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1031	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1032	wall_w_x(j,i) = 1.0_wp
1033	fwxm(j,i) = 0.0_wp
1034	fwxp(j,i) = 1.0_wp
1035	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1036	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1037	wall_w_x(j,i) = 1.0_wp
1038	fwxm(j,i) = 1.0_wp
1039	fwxp(j,i) = 0.0_wp
1040	ENDIF
1041	!
1042	!-- Wall and corner locations inside buildings for limitation of
1043	!-- near-wall mixing length l_wall
1044	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1045
1046	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1047
1048	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1049	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1050	nzb_s_inner(j,i-1) ) + 1
1051	ENDIF
1052
1053	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1054	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1055	nzb_s_inner(j,i+1) ) + 1
1056	ENDIF
1057
1058	ENDIF
1059
1060	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1061
1062	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1063	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1064	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1065	nzb_s_inner(j,i-1) ) + 1
1066	ENDIF
1067
1068	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1069	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1070	nzb_s_inner(j,i+1) ) + 1
1071	ENDIF
1072
1073	ENDIF
1074
1075	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1076	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1077	ENDIF
1078
1079	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1080	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1081	ENDIF
1082
1083	ENDDO
1084	ENDDO
1085
1086	!
1087	!-- Calculate wall flag arrays for the multigrid method
1088	IF ( psolver(1:9) == 'multigrid' ) THEN
1089	!
1090	!-- Gridpoint increment of the current level
1091	inc = 1
1092
1093	DO l = maximum_grid_level, 1 , -1
1094
1095	nxl_l = nxl_mg(l)
1096	nxr_l = nxr_mg(l)
1097	nys_l = nys_mg(l)
1098	nyn_l = nyn_mg(l)
1099	nzt_l = nzt_mg(l)
1100
1101	!
1102	!-- Assign the flag level to be calculated
1103	SELECT CASE ( l )
1104	CASE ( 1 )
1105	flags => wall_flags_1
1106	CASE ( 2 )
1107	flags => wall_flags_2
1108	CASE ( 3 )
1109	flags => wall_flags_3
1110	CASE ( 4 )
1111	flags => wall_flags_4
1112	CASE ( 5 )
1113	flags => wall_flags_5
1114	CASE ( 6 )
1115	flags => wall_flags_6
1116	CASE ( 7 )
1117	flags => wall_flags_7
1118	CASE ( 8 )
1119	flags => wall_flags_8
1120	CASE ( 9 )
1121	flags => wall_flags_9
1122	CASE ( 10 )
1123	flags => wall_flags_10
1124	END SELECT
1125
1126	!
1127	!-- Depending on the grid level, set the respective bits in case of
1128	!-- neighbouring walls
1129	!-- Bit 0: wall to the bottom
1130	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1131	!-- Bit 2: wall to the south
1132	!-- Bit 3: wall to the north
1133	!-- Bit 4: wall to the left
1134	!-- Bit 5: wall to the right
1135	!-- Bit 6: inside building
1136
1137	flags = 0
1138
1139	!
1140	!-- In case of masking method, flags are not set and multigrid method
1141	!-- works like FFT-solver
1142	IF ( .NOT. masking_method ) THEN
1143
1144	DO i = nxl_l-1, nxr_l+1
1145	DO j = nys_l-1, nyn_l+1
1146	DO k = nzb, nzt_l+1
1147
1148	!
1149	!-- Inside/outside building (inside building does not need
1150	!-- further tests for walls)
1151	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1152
1153	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1154
1155	ELSE
1156	!
1157	!-- Bottom wall
1158	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1159	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1160	ENDIF
1161	!
1162	!-- South wall
1163	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1164	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1165	ENDIF
1166	!
1167	!-- North wall
1168	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1169	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1170	ENDIF
1171	!
1172	!-- Left wall
1173	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1174	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1175	ENDIF
1176	!
1177	!-- Right wall
1178	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1179	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1180	ENDIF
1181
1182	ENDIF
1183
1184	ENDDO
1185	ENDDO
1186	ENDDO
1187
1188	ENDIF
1189
1190	!
1191	!-- Test output of flag arrays
1192	! i = nxl_l
1193	! WRITE (9,*) ' '
1194	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1195	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1196	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1197	! DO k = nzt_l+1, nzb, -1
1198	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1199	! ENDDO
1200
1201	inc = inc * 2
1202
1203	ENDDO
1204
1205	ENDIF
1206	!
1207	!-- Allocate flags needed for masking walls.
1208	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1209	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1210	wall_flags_0 = 0
1211	wall_flags_00 = 0
1212
1213	IF ( scalar_advec == 'ws-scheme' .OR. &
1214	scalar_advec == 'ws-scheme-mono' ) THEN
1215	!
1216	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1217	!-- near topography, inflow- and outflow boundaries as well as bottom and
1218	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1219	!-- grid points.
1220	DO i = nxl, nxr
1221	DO j = nys, nyn
1222	DO k = nzb_s_inner(j,i)+1, nzt
1223	!
1224	!-- scalar - x-direction
1225	!-- WS1 (0), WS3 (1), WS5 (2)
1226	IF ( k <= nzb_s_inner(j,i+1) .OR. &
1227	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1228	.AND. i == nxl ) .OR. &
1229	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1230	.AND. i == nxr ) ) &
1231	THEN
1232	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1233	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1234	.OR. &
1235	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1236	.AND. i == nxr-1 ) .OR. &
1237	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1238	.AND. i == nxlu ) ) &
1239	THEN
1240	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1241	ELSE
1242	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1243	ENDIF
1244	!
1245	!-- scalar - y-direction
1246	!-- WS1 (3), WS3 (4), WS5 (5)
1247	IF ( k <= nzb_s_inner(j+1,i) .OR. &
1248	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1249	.AND. j == nys ) .OR. &
1250	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1251	.AND. j == nyn ) ) &
1252	THEN
1253	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1254	!
1255	!-- WS3
1256	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1257	.OR. &
1258	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1259	.AND. j == nysv ) .OR. &
1260	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1261	.AND. j == nyn-1 ) ) &
1262	THEN
1263	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1264	!
1265	!-- WS5
1266	ELSE
1267	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1268	ENDIF
1269	!
1270	!-- scalar - z-direction
1271	!-- WS1 (6), WS3 (7), WS5 (8)
1272	flag_set = .FALSE.
1273	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1274	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1275	flag_set = .TRUE.
1276	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1277	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1278	flag_set = .TRUE.
1279	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1280	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1281	ENDIF
1282	ENDDO
1283	ENDDO
1284	ENDDO
1285	ENDIF
1286
1287	IF ( momentum_advec == 'ws-scheme' ) THEN
1288	!
1289	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1290	!-- near topography, inflow- and outflow boundaries as well as bottom and
1291	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1292	!-- grid points.
1293	DO i = nxl, nxr
1294	DO j = nys, nyn
1295	DO k = nzb+1, nzt
1296	!
1297	!-- At first, set flags to WS1.
1298	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1299	!-- in order to handle the left/south flux.
1300	!-- near vertical walls.
1301	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1302	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1303	!
1304	!-- u component - x-direction
1305	!-- WS1 (9), WS3 (10), WS5 (11)
1306	IF ( k <= nzb_u_inner(j,i+1) .OR. &
1307	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1308	.AND. i <= nxlu ) .OR. &
1309	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1310	.AND. i == nxr ) ) &
1311	THEN
1312	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1313	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1314	.OR. &
1315	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1316	.AND. i == nxr-1 ) .OR. &
1317	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1318	.AND. i == nxlu+1) ) &
1319	THEN
1320	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1321	!
1322	!-- Clear flag for WS1
1323	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1324	ELSE
1325	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1326	!
1327	!-- Clear flag for WS1
1328	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1329	ENDIF
1330	!
1331	!-- u component - y-direction
1332	!-- WS1 (12), WS3 (13), WS5 (14)
1333	IF ( k <= nzb_u_inner(j+1,i) .OR. &
1334	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1335	.AND. j == nys ) .OR. &
1336	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1337	.AND. j == nyn ) ) &
1338	THEN
1339	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1340	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1341	.OR. &
1342	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1343	.AND. j == nysv ) .OR. &
1344	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1345	.AND. j == nyn-1 ) ) &
1346	THEN
1347	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1348	!
1349	!-- Clear flag for WS1
1350	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1351	ELSE
1352	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1353	!
1354	!-- Clear flag for WS1
1355	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1356	ENDIF
1357	!
1358	!-- u component - z-direction
1359	!-- WS1 (15), WS3 (16), WS5 (17)
1360	flag_set = .FALSE.
1361	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1362	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1363	flag_set = .TRUE.
1364	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1365	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1366	flag_set = .TRUE.
1367	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1368	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1369	ENDIF
1370
1371	ENDDO
1372	ENDDO
1373	ENDDO
1374
1375	DO i = nxl, nxr
1376	DO j = nys, nyn
1377	DO k = nzb+1, nzt
1378	!
1379	!-- At first, set flags to WS1.
1380	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1381	!-- in order to handle the left/south flux.
1382	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1383	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1384	!
1385	!-- v component - x-direction
1386	!-- WS1 (18), WS3 (19), WS5 (20)
1387	IF ( k <= nzb_v_inner(j,i+1) .OR. &
1388	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1389	.AND. i == nxl ) .OR. &
1390	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1391	.AND. i == nxr ) ) &
1392	THEN
1393	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1394	!
1395	!-- WS3
1396	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1397	.OR. &
1398	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1399	.AND. i == nxr-1 ) .OR. &
1400	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1401	.AND. i == nxlu ) ) &
1402	THEN
1403	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1404	!
1405	!-- Clear flag for WS1
1406	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1407	ELSE
1408	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1409	!
1410	!-- Clear flag for WS1
1411	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1412	ENDIF
1413	!
1414	!-- v component - y-direction
1415	!-- WS1 (21), WS3 (22), WS5 (23)
1416	IF ( k <= nzb_v_inner(j+1,i) .OR. &
1417	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1418	.AND. j <= nysv ) .OR. &
1419	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1420	.AND. j == nyn ) ) &
1421	THEN
1422	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1423	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1424	.OR. &
1425	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1426	.AND. j == nysv+1) .OR. &
1427	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1428	.AND. j == nyn-1 ) ) &
1429	THEN
1430	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1431	!
1432	!-- Clear flag for WS1
1433	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1434	ELSE
1435	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1436	!
1437	!-- Clear flag for WS1
1438	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1439	ENDIF
1440	!
1441	!-- v component - z-direction
1442	!-- WS1 (24), WS3 (25), WS5 (26)
1443	flag_set = .FALSE.
1444	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1445	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1446	flag_set = .TRUE.
1447	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1448	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1449	flag_set = .TRUE.
1450	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1451	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1452	ENDIF
1453
1454	ENDDO
1455	ENDDO
1456	ENDDO
1457	DO i = nxl, nxr
1458	DO j = nys, nyn
1459	DO k = nzb+1, nzt
1460	!
1461	!-- At first, set flags to WS1.
1462	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1463	!-- in order to handle the left/south flux.
1464	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1465	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1466	!
1467	!-- w component - x-direction
1468	!-- WS1 (27), WS3 (28), WS5 (29)
1469	IF ( k <= nzb_w_inner(j,i+1) .OR. &
1470	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1471	.AND. i == nxl ) .OR. &
1472	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1473	.AND. i == nxr ) ) &
1474	THEN
1475	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1476	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1477	.OR. &
1478	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1479	.AND. i == nxr-1 ) .OR. &
1480	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1481	.AND. i == nxlu ) ) &
1482	THEN
1483	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1484	!
1485	!-- Clear flag for WS1
1486	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1487	ELSE
1488	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1489	!
1490	!-- Clear flag for WS1
1491	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1492	ENDIF
1493	!
1494	!-- w component - y-direction
1495	!-- WS1 (30), WS3 (31), WS5 (32)
1496	IF ( k <= nzb_w_inner(j+1,i) .OR. &
1497	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1498	.AND. j == nys ) .OR. &
1499	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1500	.AND. j == nyn ) ) &
1501	THEN
1502	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1503	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1504	.OR. &
1505	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1506	.AND. j == nysv ) .OR. &
1507	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1508	.AND. j == nyn-1 ) ) &
1509	THEN
1510	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1511	!
1512	!-- Clear flag for WS1
1513	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1514	ELSE
1515	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1516	!
1517	!-- Clear flag for WS1
1518	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1519	ENDIF
1520	!
1521	!-- w component - z-direction
1522	!-- WS1 (33), WS3 (34), WS5 (35)
1523	flag_set = .FALSE.
1524	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1525	.OR. k == nzt ) THEN
1526	!
1527	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1528	!-- set, although this is not a prognostic level. However,
1529	!-- contrary to the advection of u,v and s this is necessary
1530	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1531	!-- at k == nzb_w_inner(j,i)+1.
1532	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1533	flag_set = .TRUE.
1534	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1535	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1536	flag_set = .TRUE.
1537	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1538	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1539	ENDIF
1540
1541	ENDDO
1542	ENDDO
1543	ENDDO
1544
1545	ENDIF
1546
1547	!
1548	!-- Exchange 3D integer wall_flags.
1549	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1550	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1551	!
1552	!-- Exchange ghost points for advection flags
1553	CALL exchange_horiz_int( wall_flags_0, nbgp )
1554	CALL exchange_horiz_int( wall_flags_00, nbgp )
1555	!
1556	!-- Set boundary flags at inflow and outflow boundary in case of
1557	!-- non-cyclic boundary conditions.
1558	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1559	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1560	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1561	ENDIF
1562
1563	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
1564	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1565	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1566	ENDIF
1567
1568	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
1569	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1570	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1571	ENDIF
1572
1573	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1574	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1575	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1576	ENDIF
1577
1578	ENDIF
1579
1580	!
1581	!-- In case of topography: limit near-wall mixing length l_wall further:
1582	!-- Go through all points of the subdomain one by one and look for the closest
1583	!-- surface
1584	IF ( TRIM(topography) /= 'flat' ) THEN
1585	DO i = nxl, nxr
1586	DO j = nys, nyn
1587
1588	nzb_si = nzb_s_inner(j,i)
1589	vi = vertical_influence(nzb_si)
1590
1591	IF ( wall_n(j,i) > 0 ) THEN
1592	!
1593	!-- North wall (y distance)
1594	DO k = wall_n(j,i), nzb_si
1595	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1596	ENDDO
1597	!
1598	!-- Above North wall (yz distance)
1599	DO k = nzb_si + 1, nzb_si + vi
1600	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1601	SQRT( 0.25_wp * dy**2 + &
1602	( zu(k) - zw(nzb_si) )**2 ) )
1603	ENDDO
1604	!
1605	!-- Northleft corner (xy distance)
1606	IF ( corner_nl(j,i) > 0 ) THEN
1607	DO k = corner_nl(j,i), nzb_si
1608	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1609	0.5_wp * SQRT( dx2 + dy2 ) )
1610	ENDDO
1611	!
1612	!-- Above Northleft corner (xyz distance)
1613	DO k = nzb_si + 1, nzb_si + vi
1614	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1615	SQRT( 0.25_wp * (dx2 + dy2) + &
1616	( zu(k) - zw(nzb_si) )**2 ) )
1617	ENDDO
1618	ENDIF
1619	!
1620	!-- Northright corner (xy distance)
1621	IF ( corner_nr(j,i) > 0 ) THEN
1622	DO k = corner_nr(j,i), nzb_si
1623	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1624	0.5_wp * SQRT( dx2 + dy2 ) )
1625	ENDDO
1626	!
1627	!-- Above northright corner (xyz distance)
1628	DO k = nzb_si + 1, nzb_si + vi
1629	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1630	SQRT( 0.25_wp * (dx2 + dy2) + &
1631	( zu(k) - zw(nzb_si) )**2 ) )
1632	ENDDO
1633	ENDIF
1634	ENDIF
1635
1636	IF ( wall_s(j,i) > 0 ) THEN
1637	!
1638	!-- South wall (y distance)
1639	DO k = wall_s(j,i), nzb_si
1640	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1641	ENDDO
1642	!
1643	!-- Above south wall (yz distance)
1644	DO k = nzb_si + 1, nzb_si + vi
1645	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1646	SQRT( 0.25_wp * dy**2 + &
1647	( zu(k) - zw(nzb_si) )**2 ) )
1648	ENDDO
1649	!
1650	!-- Southleft corner (xy distance)
1651	IF ( corner_sl(j,i) > 0 ) THEN
1652	DO k = corner_sl(j,i), nzb_si
1653	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1654	0.5_wp * SQRT( dx2 + dy2 ) )
1655	ENDDO
1656	!
1657	!-- Above southleft corner (xyz distance)
1658	DO k = nzb_si + 1, nzb_si + vi
1659	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1660	SQRT( 0.25_wp * (dx2 + dy2) + &
1661	( zu(k) - zw(nzb_si) )**2 ) )
1662	ENDDO
1663	ENDIF
1664	!
1665	!-- Southright corner (xy distance)
1666	IF ( corner_sr(j,i) > 0 ) THEN
1667	DO k = corner_sr(j,i), nzb_si
1668	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1669	0.5_wp * SQRT( dx2 + dy2 ) )
1670	ENDDO
1671	!
1672	!-- Above southright corner (xyz distance)
1673	DO k = nzb_si + 1, nzb_si + vi
1674	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1675	SQRT( 0.25_wp * (dx2 + dy2) + &
1676	( zu(k) - zw(nzb_si) )**2 ) )
1677	ENDDO
1678	ENDIF
1679
1680	ENDIF
1681
1682	IF ( wall_l(j,i) > 0 ) THEN
1683	!
1684	!-- Left wall (x distance)
1685	DO k = wall_l(j,i), nzb_si
1686	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1687	ENDDO
1688	!
1689	!-- Above left wall (xz distance)
1690	DO k = nzb_si + 1, nzb_si + vi
1691	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1692	SQRT( 0.25_wp * dx**2 + &
1693	( zu(k) - zw(nzb_si) )**2 ) )
1694	ENDDO
1695	ENDIF
1696
1697	IF ( wall_r(j,i) > 0 ) THEN
1698	!
1699	!-- Right wall (x distance)
1700	DO k = wall_r(j,i), nzb_si
1701	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1702	ENDDO
1703	!
1704	!-- Above right wall (xz distance)
1705	DO k = nzb_si + 1, nzb_si + vi
1706	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1707	SQRT( 0.25_wp * dx**2 + &
1708	( zu(k) - zw(nzb_si) )**2 ) )
1709	ENDDO
1710
1711	ENDIF
1712
1713	ENDDO
1714	ENDDO
1715
1716	ENDIF
1717
1718	!
1719	!-- Multiplication with wall_adjustment_factor
1720	l_wall = wall_adjustment_factor * l_wall
1721
1722	!
1723	!-- Set lateral boundary conditions for l_wall
1724	CALL exchange_horiz( l_wall, nbgp )
1725
1726	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1727	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1728
1729	#endif
1730
1731	END SUBROUTINE init_grid

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