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source: palm/trunk/SOURCE/init_grid.f90 @ 1811

Last change on this file since 1811 was 1805, checked in by maronga, 9 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 1805 2016-04-05 16:32:34Z maronga $
26	!
27	! 1804 2016-04-05 16:30:18Z maronga
28	! Removed code for parameter file check (__check)
29	!
30	! 1779 2016-03-03 08:01:28Z raasch
31	! coupling_char is trimmed at every place it occurs, because it can have
32	! different length now
33	!
34	! 1762 2016-02-25 12:31:13Z hellstea
35	! Introduction of nested domain feature
36	!
37	! 1743 2016-01-13 10:23:51Z raasch
38	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
39	! total domain
40	!
41	! 1691 2015-10-26 16:17:44Z maronga
42	! Renamed prandtl_layer to constant_flux_layer.
43	!
44	! 1682 2015-10-07 23:56:08Z knoop
45	! Code annotations made doxygen readable
46	!
47	! 1677 2015-10-02 13:25:23Z boeske
48	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
49	!
50	! 1675 2015-10-02 08:28:59Z gronemeier
51	! Bugfix: Definition of topography grid levels
52	!
53	! 1660 2015-09-21 08:15:16Z gronemeier
54	! Bugfix: Definition of topography grid levels if vertical grid stretching
55	! starts below the maximum topography height.
56	!
57	! 1580 2015-04-10 13:43:49Z suehring
58	! Bugfix: setting flags for 5th order scheme near buildings
59	!
60	! 1575 2015-03-27 09:56:27Z raasch
61	! adjustments for psolver-queries
62	!
63	! 1557 2015-03-05 16:43:04Z suehring
64	! Adjustment for monotoinic limiter
65	!
66	! 1418 2014-06-06 13:05:08Z fricke
67	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
68	! condition and a negative value for dz_stretch_level the condition
69	! was always true for the whole model domain
70	!
71	! 1409 2014-05-23 12:11:32Z suehring
72	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
73	! j <= nysv
74	!
75	! 1353 2014-04-08 15:21:23Z heinze
76	! REAL constants provided with KIND-attribute
77	!
78	! 1322 2014-03-20 16:38:49Z raasch
79	! REAL constants defined as wp-kind
80	!
81	! 1320 2014-03-20 08:40:49Z raasch
82	! ONLY-attribute added to USE-statements,
83	! kind-parameters added to all INTEGER and REAL declaration statements,
84	! kinds are defined in new module kinds,
85	! revision history before 2012 removed,
86	! comment fields (!:) to be used for variable explanations added to
87	! all variable declaration statements
88	!
89	! 1221 2013-09-10 08:59:13Z raasch
90	! wall_flags_00 introduced to hold bits 32-63,
91	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
92	! loops optimized for openACC (pres + flow_statistics)
93	!
94	! 1092 2013-02-02 11:24:22Z raasch
95	! unused variables removed
96	!
97	! 1069 2012-11-28 16:18:43Z maronga
98	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
99	! ocean model in case of coupled runs
100	!
101	! 1036 2012-10-22 13:43:42Z raasch
102	! code put under GPL (PALM 3.9)
103	!
104	! 1015 2012-09-27 09:23:24Z raasch
105	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
106	! nzb_w_inner+1
107	!
108	! 996 2012-09-07 10:41:47Z raasch
109	! little reformatting
110	!
111	! 978 2012-08-09 08:28:32Z fricke
112	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
113	! Bugfix: Set wall_flags_0 for inflow boundary
114	!
115	! 927 2012-06-06 19:15:04Z raasch
116	! Wall flags are not set for multigrid method in case of masking method
117	!
118	! 864 2012-03-27 15:10:33Z gryschka
119	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
120	! were not correctly defined for k=1.
121	!
122	! 861 2012-03-26 14:18:34Z suehring
123	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
124	! inflow and outflow boundaries as well as near the bottom and the top of the
125	! model domain.!
126	! Initialization of nzb_s_inner and nzb_w_inner.
127	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
128	! while setting wall_flags_0
129	!
130	! 843 2012-02-29 15:16:21Z gryschka
131	! In case of ocean and dirichlet bc for u and v at the bottom
132	! the first u-level ist defined at same height as the first w-level
133	!
134	! 818 2012-02-08 16:11:23Z maronga
135	! Bugfix: topo_height is only required if topography is used. It is thus now
136	! allocated in the topography branch
137	!
138	! 809 2012-01-30 13:32:58Z maronga
139	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
140	!
141	! 807 2012-01-25 11:53:51Z maronga
142	! New cpp directive "__check" implemented which is used by check_namelist_files
143	!
144	! Revision 1.1 1997/08/11 06:17:45 raasch
145	! Initial revision (Testversion)
146	!
147	!
148	! Description:
149	! ------------
150	!> Creating grid depending constants
151	!------------------------------------------------------------------------------!
152	SUBROUTINE init_grid
153
154
155	USE arrays_3d, &
156	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
157	f2_mg, f3_mg, l_grid, l_wall, zu, zw
158
159	USE control_parameters, &
160	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
161	building_length_y, building_wall_left, building_wall_south, &
162	canyon_height, canyon_wall_left, canyon_wall_south, &
163	canyon_width_x, canyon_width_y, constant_flux_layer, &
164	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
165	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
166	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
167	masking_method, maximum_grid_level, message_string, &
168	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
169	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
170	outflow_r, outflow_s, psolver, scalar_advec, topography, &
171	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
172	wall_adjustment_factor
173
174	USE grid_variables, &
175	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
176	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
177	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
178
179	USE indices, &
180	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
181	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
182	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
183	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
184	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
185	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
186	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
187	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
188	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
189	wall_flags_9
190
191	USE kinds
192
193	USE pegrid
194
195	IMPLICIT NONE
196
197	INTEGER(iwp) :: bh !<
198	INTEGER(iwp) :: blx !<
199	INTEGER(iwp) :: bly !<
200	INTEGER(iwp) :: bxl !<
201	INTEGER(iwp) :: bxr !<
202	INTEGER(iwp) :: byn !<
203	INTEGER(iwp) :: bys !<
204	INTEGER(iwp) :: ch !<
205	INTEGER(iwp) :: cwx !<
206	INTEGER(iwp) :: cwy !<
207	INTEGER(iwp) :: cxl !<
208	INTEGER(iwp) :: cxr !<
209	INTEGER(iwp) :: cyn !<
210	INTEGER(iwp) :: cys !<
211	INTEGER(iwp) :: gls !<
212	INTEGER(iwp) :: i !<
213	INTEGER(iwp) :: ii !<
214	INTEGER(iwp) :: inc !<
215	INTEGER(iwp) :: j !<
216	INTEGER(iwp) :: k !<
217	INTEGER(iwp) :: l !<
218	INTEGER(iwp) :: nxl_l !<
219	INTEGER(iwp) :: nxr_l !<
220	INTEGER(iwp) :: nyn_l !<
221	INTEGER(iwp) :: nys_l !<
222	INTEGER(iwp) :: nzb_si !<
223	INTEGER(iwp) :: nzt_l !<
224	INTEGER(iwp) :: vi !<
225
226	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
227
228	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
229	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
230	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
231	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
232	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
233	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
234	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
235	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
236	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
237	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
238
239	LOGICAL :: flag_set = .FALSE. !<
240
241	REAL(wp) :: dx_l !<
242	REAL(wp) :: dy_l !<
243	REAL(wp) :: dz_stretched !<
244
245	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
246
247
248	!
249	!-- Calculation of horizontal array bounds including ghost layers
250	nxlg = nxl - nbgp
251	nxrg = nxr + nbgp
252	nysg = nys - nbgp
253	nyng = nyn + nbgp
254
255	!
256	!-- Allocate grid arrays
257	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
258	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
259
260	!
261	!-- Compute height of u-levels from constant grid length and dz stretch factors
262	IF ( dz == -1.0_wp ) THEN
263	message_string = 'missing dz'
264	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
265	ELSEIF ( dz <= 0.0_wp ) THEN
266	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
267	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
268	ENDIF
269
270	!
271	!-- Define the vertical grid levels
272	IF ( .NOT. ocean ) THEN
273	!
274	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
275	!-- The second u-level (k=1) corresponds to the top of the
276	!-- Prandtl-layer.
277
278	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
279	zu(0) = 0.0_wp
280	! zu(0) = - dz * 0.5_wp
281	ELSE
282	zu(0) = - dz * 0.5_wp
283	ENDIF
284	zu(1) = dz * 0.5_wp
285
286	dz_stretch_level_index = nzt+1
287	dz_stretched = dz
288	DO k = 2, nzt+1
289	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
290	dz_stretched = dz_stretched * dz_stretch_factor
291	dz_stretched = MIN( dz_stretched, dz_max )
292	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
293	ENDIF
294	zu(k) = zu(k-1) + dz_stretched
295	ENDDO
296
297	!
298	!-- Compute the w-levels. They are always staggered half-way between the
299	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
300	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
301	!-- The top w-level is extrapolated linearly.
302	zw(0) = 0.0_wp
303	DO k = 1, nzt
304	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
305	ENDDO
306	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
307
308	ELSE
309	!
310	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
311	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
312	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
313	!-- w-level are defined at same height, but staggered from the second level.
314	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
315	zu(nzt+1) = dz * 0.5_wp
316	zu(nzt) = - dz * 0.5_wp
317
318	dz_stretch_level_index = 0
319	dz_stretched = dz
320	DO k = nzt-1, 0, -1
321	!
322	!-- The default value of dz_stretch_level is positive, thus the first
323	!-- condition is always true. Hence, the second condition is necessary.
324	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
325	.AND. dz_stretched < dz_max ) THEN
326	dz_stretched = dz_stretched * dz_stretch_factor
327	dz_stretched = MIN( dz_stretched, dz_max )
328	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
329	ENDIF
330	zu(k) = zu(k+1) - dz_stretched
331	ENDDO
332
333	!
334	!-- Compute the w-levels. They are always staggered half-way between the
335	!-- corresponding u-levels, except in case of dirichlet bc for u and v
336	!-- at the ground. In this case the first u- and w-level are defined at
337	!-- same height. The top w-level (nzt+1) is not used but set for
338	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
339	zw(nzt+1) = dz
340	zw(nzt) = 0.0_wp
341	DO k = 0, nzt
342	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
343	ENDDO
344
345	!
346	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
347	!-- at same height.
348	IF ( ibc_uv_b == 0 ) THEN
349	zu(0) = zw(0)
350	ENDIF
351
352	ENDIF
353
354	!
355	!-- Compute grid lengths.
356	DO k = 1, nzt+1
357	dzu(k) = zu(k) - zu(k-1)
358	ddzu(k) = 1.0_wp / dzu(k)
359	dzw(k) = zw(k) - zw(k-1)
360	ddzw(k) = 1.0_wp / dzw(k)
361	ENDDO
362
363	DO k = 1, nzt
364	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
365	ENDDO
366
367	!
368	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
369	!-- everywhere. For the actual grid, the grid spacing at the lowest level
370	!-- is only dz/2, but should be dz. Therefore, an additional array
371	!-- containing with appropriate grid information is created for these
372	!-- solvers.
373	IF ( psolver(1:9) /= 'multigrid' ) THEN
374	ALLOCATE( ddzu_pres(1:nzt+1) )
375	ddzu_pres = ddzu
376	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
377	ENDIF
378
379	!
380	!-- In case of multigrid method, compute grid lengths and grid factors for the
381	!-- grid levels
382	IF ( psolver(1:9) == 'multigrid' ) THEN
383
384	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
385	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
386	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
387	f1_mg(nzb+1:nzt,maximum_grid_level), &
388	f2_mg(nzb+1:nzt,maximum_grid_level), &
389	f3_mg(nzb+1:nzt,maximum_grid_level) )
390
391	dzu_mg(:,maximum_grid_level) = dzu
392	!
393	!-- Next line to ensure an equally spaced grid.
394	dzu_mg(1,maximum_grid_level) = dzu(2)
395
396	dzw_mg(:,maximum_grid_level) = dzw
397	nzt_l = nzt
398	DO l = maximum_grid_level-1, 1, -1
399	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
400	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
401	nzt_l = nzt_l / 2
402	DO k = 2, nzt_l+1
403	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
404	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
405	ENDDO
406	ENDDO
407
408	nzt_l = nzt
409	dx_l = dx
410	dy_l = dy
411	DO l = maximum_grid_level, 1, -1
412	ddx2_mg(l) = 1.0_wp / dx_l**2
413	ddy2_mg(l) = 1.0_wp / dy_l**2
414	DO k = nzb+1, nzt_l
415	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
416	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
417	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
418	f2_mg(k,l) + f3_mg(k,l)
419	ENDDO
420	nzt_l = nzt_l / 2
421	dx_l = dx_l * 2.0_wp
422	dy_l = dy_l * 2.0_wp
423	ENDDO
424
425	ENDIF
426
427	!
428	!-- Compute the reciprocal values of the horizontal grid lengths.
429	ddx = 1.0_wp / dx
430	ddy = 1.0_wp / dy
431	dx2 = dx * dx
432	dy2 = dy * dy
433	ddx2 = 1.0_wp / dx2
434	ddy2 = 1.0_wp / dy2
435
436	!
437	!-- Compute the grid-dependent mixing length.
438	DO k = 1, nzt
439	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
440	ENDDO
441
442	!
443	!-- Allocate outer and inner index arrays for topography and set
444	!-- defaults.
445	!-- nzb_local has to contain additional layers of ghost points for calculating
446	!-- the flag arrays needed for the multigrid method
447	gls = 2**( maximum_grid_level )
448	IF ( gls < nbgp ) gls = nbgp
449
450	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
451	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
452	nzb_local(-gls:ny+gls,-gls:nx+gls), &
453	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
454	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
455	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
456	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
457	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
458	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
459	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
460	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
461	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
462	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
463	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
464	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
465	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
466	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
467	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
468	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
469	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
470	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
471	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
472	nzb_2d(nysg:nyng,nxlg:nxrg), &
473	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
474	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
475	wall_e_x(nysg:nyng,nxlg:nxrg), &
476	wall_e_y(nysg:nyng,nxlg:nxrg), &
477	wall_u(nysg:nyng,nxlg:nxrg), &
478	wall_v(nysg:nyng,nxlg:nxrg), &
479	wall_w_x(nysg:nyng,nxlg:nxrg), &
480	wall_w_y(nysg:nyng,nxlg:nxrg) )
481
482
483
484	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
485
486
487	nzb_s_inner = nzb; nzb_s_outer = nzb
488	nzb_u_inner = nzb; nzb_u_outer = nzb
489	nzb_v_inner = nzb; nzb_v_outer = nzb
490	nzb_w_inner = nzb; nzb_w_outer = nzb
491
492	rflags_s_inner = 1.0_wp
493	rflags_invers = 1.0_wp
494
495	!
496	!-- Define vertical gridpoint from (or to) which on the usual finite difference
497	!-- form (which does not use surface fluxes) is applied
498	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
499	nzb_diff = nzb + 2
500	ELSE
501	nzb_diff = nzb + 1
502	ENDIF
503	IF ( use_top_fluxes ) THEN
504	nzt_diff = nzt - 1
505	ELSE
506	nzt_diff = nzt
507	ENDIF
508
509	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
510	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
511
512	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
513	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
514	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
515	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
516
517	!
518	!-- Initialize near-wall mixing length l_wall only in the vertical direction
519	!-- for the moment,
520	!-- multiplication with wall_adjustment_factor near the end of this routine
521	l_wall(nzb,:,:) = l_grid(1)
522	DO k = nzb+1, nzt
523	l_wall(k,:,:) = l_grid(k)
524	ENDDO
525	l_wall(nzt+1,:,:) = l_grid(nzt)
526
527	ALLOCATE ( vertical_influence(nzb:nzt) )
528	DO k = 1, nzt
529	vertical_influence(k) = MIN ( INT( l_grid(k) / &
530	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
531	ENDDO
532
533	DO k = 1, MAXVAL( nzb_s_inner )
534	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
535	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
536	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
537	'threshold given by only local', &
538	' &horizontal reduction of near_wall ', &
539	'mixing length l_wall', &
540	' &starting from height level k = ', k, '.'
541	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
542	EXIT
543	ENDIF
544	ENDDO
545	vertical_influence(0) = vertical_influence(1)
546
547	DO i = nxlg, nxrg
548	DO j = nysg, nyng
549	DO k = nzb_s_inner(j,i) + 1, &
550	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
551	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
552	ENDDO
553	ENDDO
554	ENDDO
555
556	!
557	!-- Set outer and inner index arrays for non-flat topography.
558	!-- Here consistency checks concerning domain size and periodicity are
559	!-- necessary.
560	!-- Within this SELECT CASE structure only nzb_local is initialized
561	!-- individually depending on the chosen topography type, all other index
562	!-- arrays are initialized further below.
563	SELECT CASE ( TRIM( topography ) )
564
565	CASE ( 'flat' )
566	!
567	!-- nzb_local is required for the multigrid solver
568	nzb_local = 0
569
570	CASE ( 'single_building' )
571	!
572	!-- Single rectangular building, by default centered in the middle of the
573	!-- total domain
574	blx = NINT( building_length_x / dx )
575	bly = NINT( building_length_y / dy )
576	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
577	IF ( ABS( zw(bh ) - building_height ) == &
578	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
579
580	IF ( building_wall_left == 9999999.9_wp ) THEN
581	building_wall_left = ( nx + 1 - blx ) / 2 * dx
582	ENDIF
583	bxl = NINT( building_wall_left / dx )
584	bxr = bxl + blx
585
586	IF ( building_wall_south == 9999999.9_wp ) THEN
587	building_wall_south = ( ny + 1 - bly ) / 2 * dy
588	ENDIF
589	bys = NINT( building_wall_south / dy )
590	byn = bys + bly
591
592	!
593	!-- Building size has to meet some requirements
594	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
595	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
596	WRITE( message_string, * ) 'inconsistent building parameters:', &
597	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
598	'byn=', byn, 'nx=', nx, 'ny=', ny
599	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
600	ENDIF
601
602	!
603	!-- Define the building.
604	nzb_local = 0
605	nzb_local(bys:byn,bxl:bxr) = bh
606
607	CASE ( 'single_street_canyon' )
608	!
609	!-- Single quasi-2D street canyon of infinite length in x or y direction.
610	!-- The canyon is centered in the other direction by default.
611	IF ( canyon_width_x /= 9999999.9_wp ) THEN
612	!
613	!-- Street canyon in y direction
614	cwx = NINT( canyon_width_x / dx )
615	IF ( canyon_wall_left == 9999999.9_wp ) THEN
616	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
617	ENDIF
618	cxl = NINT( canyon_wall_left / dx )
619	cxr = cxl + cwx
620
621	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
622	!
623	!-- Street canyon in x direction
624	cwy = NINT( canyon_width_y / dy )
625	IF ( canyon_wall_south == 9999999.9_wp ) THEN
626	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
627	ENDIF
628	cys = NINT( canyon_wall_south / dy )
629	cyn = cys + cwy
630
631	ELSE
632
633	message_string = 'no street canyon width given'
634	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
635
636	ENDIF
637
638	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
639	IF ( ABS( zw(ch ) - canyon_height ) == &
640	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
641
642	dp_level_ind_b = ch
643	!
644	!-- Street canyon size has to meet some requirements
645	IF ( canyon_width_x /= 9999999.9_wp ) THEN
646	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
647	( ch < 3 ) ) THEN
648	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
649	'&cxl=', cxl, 'cxr=', cxr, &
650	'cwx=', cwx, &
651	'ch=', ch, 'nx=', nx, 'ny=', ny
652	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
653	ENDIF
654	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
655	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
656	( ch < 3 ) ) THEN
657	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
658	'&cys=', cys, 'cyn=', cyn, &
659	'cwy=', cwy, &
660	'ch=', ch, 'nx=', nx, 'ny=', ny
661	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
662	ENDIF
663	ENDIF
664	IF ( canyon_width_x /= 9999999.9_wp .AND. &
665	canyon_width_y /= 9999999.9_wp ) THEN
666	message_string = 'inconsistent canyon parameters:' // &
667	'&street canyon can only be oriented' // &
668	'&either in x- or in y-direction'
669	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
670	ENDIF
671
672	nzb_local = ch
673	IF ( canyon_width_x /= 9999999.9_wp ) THEN
674	nzb_local(:,cxl+1:cxr-1) = 0
675	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
676	nzb_local(cys+1:cyn-1,:) = 0
677	ENDIF
678
679	CASE ( 'read_from_file' )
680
681	ALLOCATE ( topo_height(0:ny,0:nx) )
682
683	DO ii = 0, io_blocks-1
684	IF ( ii == io_group ) THEN
685
686	!
687	!-- Arbitrary irregular topography data in PALM format (exactly
688	!-- matching the grid size and total domain size)
689	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
690	STATUS='OLD', FORM='FORMATTED', ERR=10 )
691	DO j = ny, 0, -1
692	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
693	ENDDO
694
695	GOTO 12
696
697	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
698	' does not exist'
699	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
700
701	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
702	TRIM( coupling_char )
703	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
704
705	12 CLOSE( 90 )
706
707	ENDIF
708	#if defined( __parallel )
709	CALL MPI_BARRIER( comm2d, ierr )
710	#endif
711	ENDDO
712
713	!
714	!-- Calculate the index height of the topography
715	DO i = 0, nx
716	DO j = 0, ny
717	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
718	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
719	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
720	nzb_local(j,i) = nzb_local(j,i) + 1
721	ENDDO
722	ENDDO
723
724	DEALLOCATE ( topo_height )
725	!
726	!-- Add cyclic boundaries (additional layers are for calculating
727	!-- flag arrays needed for the multigrid sover)
728	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
729	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
730	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
731	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
732
733	CASE DEFAULT
734	!
735	!-- The DEFAULT case is reached either if the parameter topography
736	!-- contains a wrong character string or if the user has defined a special
737	!-- case in the user interface. There, the subroutine user_init_grid
738	!-- checks which of these two conditions applies.
739	CALL user_init_grid( gls, nzb_local )
740
741	END SELECT
742	!
743	!-- Determine the maximum level of topography. Furthermore it is used for
744	!-- steering the degradation of order of the applied advection scheme.
745	!-- In case of non-cyclic lateral boundaries, the order of the advection
746	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
747	nzb_max = MAXVAL( nzb_local ) + 1
748	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
749	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
750	nest_domain ) &
751	THEN
752	nzb_max = nzt
753	ENDIF
754
755	!
756	!-- Consistency checks and index array initialization are only required for
757	!-- non-flat topography, also the initialization of topography height arrays
758	!-- zu_s_inner and zw_w_inner
759	IF ( TRIM( topography ) /= 'flat' ) THEN
760
761	!
762	!-- Consistency checks
763	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
764	WRITE( message_string, * ) 'nzb_local values are outside the', &
765	'model domain', &
766	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
767	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
768	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
769	ENDIF
770
771	IF ( bc_lr == 'cyclic' ) THEN
772	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
773	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
774	message_string = 'nzb_local does not fulfill cyclic' // &
775	' boundary condition in x-direction'
776	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
777	ENDIF
778	ENDIF
779	IF ( bc_ns == 'cyclic' ) THEN
780	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
781	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
782	message_string = 'nzb_local does not fulfill cyclic' // &
783	' boundary condition in y-direction'
784	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
785	ENDIF
786	ENDIF
787
788	IF ( topography_grid_convention == 'cell_edge' ) THEN
789	!
790	!-- The array nzb_local as defined using the 'cell_edge' convention
791	!-- describes the actual total size of topography which is defined at the
792	!-- cell edges where u=0 on the topography walls in x-direction and v=0
793	!-- on the topography walls in y-direction. However, PALM uses individual
794	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
795	!-- Therefore, the extent of topography in nzb_local is now reduced by
796	!-- 1dx at the E topography walls and by 1dy at the N topography walls
797	!-- to form the basis for nzb_s_inner.
798	DO j = -gls, ny + gls
799	DO i = -gls, nx
800	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
801	ENDDO
802	ENDDO
803	!-- apply cyclic boundary conditions in x-direction
804	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
805	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
806	DO i = -gls, nx + gls
807	DO j = -gls, ny
808	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
809	ENDDO
810	ENDDO
811	!-- apply cyclic boundary conditions in y-direction
812	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
813	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
814	ENDIF
815
816	!
817	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
818	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
819	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
820
821	!
822	!-- Initialize remaining index arrays:
823	!-- first pre-initialize them with nzb_s_inner...
824	nzb_u_inner = nzb_s_inner
825	nzb_u_outer = nzb_s_inner
826	nzb_v_inner = nzb_s_inner
827	nzb_v_outer = nzb_s_inner
828	nzb_w_outer = nzb_s_inner
829	nzb_s_outer = nzb_s_inner
830
831	!
832	!-- ...then extend pre-initialized arrays in their according directions
833	!-- based on nzb_local using nzb_tmp as a temporary global index array
834
835	!
836	!-- nzb_s_outer:
837	!-- extend nzb_local east-/westwards first, then north-/southwards
838	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
839	DO j = -1, ny + 1
840	DO i = 0, nx
841	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
842	nzb_local(j,i+1) )
843	ENDDO
844	ENDDO
845	DO i = nxl, nxr
846	DO j = nys, nyn
847	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
848	nzb_tmp(j+1,i) )
849	ENDDO
850	!
851	!-- non-cyclic boundary conditions (overwritten by call of
852	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
853	IF ( nys == 0 ) THEN
854	j = -1
855	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
856	ENDIF
857	IF ( nyn == ny ) THEN
858	j = ny + 1
859	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
860	ENDIF
861	ENDDO
862	!
863	!-- nzb_w_outer:
864	!-- identical to nzb_s_outer
865	nzb_w_outer = nzb_s_outer
866
867	!
868	!-- nzb_u_inner:
869	!-- extend nzb_local rightwards only
870	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
871	DO j = -1, ny + 1
872	DO i = 0, nx + 1
873	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
874	ENDDO
875	ENDDO
876	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
877
878	!
879	!-- nzb_u_outer:
880	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
881	DO i = nxl, nxr
882	DO j = nys, nyn
883	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
884	nzb_tmp(j+1,i) )
885	ENDDO
886	!
887	!-- non-cyclic boundary conditions (overwritten by call of
888	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
889	IF ( nys == 0 ) THEN
890	j = -1
891	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
892	ENDIF
893	IF ( nyn == ny ) THEN
894	j = ny + 1
895	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
896	ENDIF
897	ENDDO
898
899	!
900	!-- nzb_v_inner:
901	!-- extend nzb_local northwards only
902	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
903	DO i = -1, nx + 1
904	DO j = 0, ny + 1
905	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
906	ENDDO
907	ENDDO
908	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
909
910	!
911	!-- nzb_v_outer:
912	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
913	DO j = nys, nyn
914	DO i = nxl, nxr
915	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
916	nzb_tmp(j,i+1) )
917	ENDDO
918	!
919	!-- non-cyclic boundary conditions (overwritten by call of
920	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
921	IF ( nxl == 0 ) THEN
922	i = -1
923	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
924	ENDIF
925	IF ( nxr == nx ) THEN
926	i = nx + 1
927	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
928	ENDIF
929	ENDDO
930
931	!
932	!-- Exchange of lateral boundary values (parallel computers) and cyclic
933	!-- boundary conditions, if applicable.
934	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
935	!-- they do not require exchange and are not included here.
936	CALL exchange_horiz_2d_int( nzb_u_inner )
937	CALL exchange_horiz_2d_int( nzb_u_outer )
938	CALL exchange_horiz_2d_int( nzb_v_inner )
939	CALL exchange_horiz_2d_int( nzb_v_outer )
940	CALL exchange_horiz_2d_int( nzb_w_outer )
941	CALL exchange_horiz_2d_int( nzb_s_outer )
942
943	!
944	!-- Allocate and set the arrays containing the topography height
945	IF ( myid == 0 ) THEN
946
947	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
948
949	DO i = 0, nx + 1
950	DO j = 0, ny + 1
951	zu_s_inner(i,j) = zu(nzb_local(j,i))
952	zw_w_inner(i,j) = zw(nzb_local(j,i))
953	ENDDO
954	ENDDO
955
956	ENDIF
957	!
958	!-- Set flag arrays to be used for masking of grid points
959	DO i = nxlg, nxrg
960	DO j = nysg, nyng
961	DO k = nzb, nzt+1
962	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
963	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
964	ENDDO
965	ENDDO
966	ENDDO
967
968	ENDIF
969
970	!
971	!-- Preliminary: to be removed after completion of the topography code!
972	!-- Set the former default k index arrays nzb_2d
973	nzb_2d = nzb
974
975	!
976	!-- Set the individual index arrays which define the k index from which on
977	!-- the usual finite difference form (which does not use surface fluxes) is
978	!-- applied
979	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
980	nzb_diff_u = nzb_u_inner + 2
981	nzb_diff_v = nzb_v_inner + 2
982	nzb_diff_s_inner = nzb_s_inner + 2
983	nzb_diff_s_outer = nzb_s_outer + 2
984	ELSE
985	nzb_diff_u = nzb_u_inner + 1
986	nzb_diff_v = nzb_v_inner + 1
987	nzb_diff_s_inner = nzb_s_inner + 1
988	nzb_diff_s_outer = nzb_s_outer + 1
989	ENDIF
990
991	!
992	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
993	!-- for limitation of near-wall mixing length l_wall further below
994	corner_nl = 0
995	corner_nr = 0
996	corner_sl = 0
997	corner_sr = 0
998	wall_l = 0
999	wall_n = 0
1000	wall_r = 0
1001	wall_s = 0
1002
1003	DO i = nxl, nxr
1004	DO j = nys, nyn
1005	!
1006	!-- u-component
1007	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
1008	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1009	fym(j,i) = 0.0_wp
1010	fyp(j,i) = 1.0_wp
1011	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
1012	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
1013	fym(j,i) = 1.0_wp
1014	fyp(j,i) = 0.0_wp
1015	ENDIF
1016	!
1017	!-- v-component
1018	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1019	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1020	fxm(j,i) = 0.0_wp
1021	fxp(j,i) = 1.0_wp
1022	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1023	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1024	fxm(j,i) = 1.0_wp
1025	fxp(j,i) = 0.0_wp
1026	ENDIF
1027	!
1028	!-- w-component, also used for scalars, separate arrays for shear
1029	!-- production of tke
1030	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1031	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1032	wall_w_y(j,i) = 1.0_wp
1033	fwym(j,i) = 0.0_wp
1034	fwyp(j,i) = 1.0_wp
1035	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1036	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1037	wall_w_y(j,i) = 1.0_wp
1038	fwym(j,i) = 1.0_wp
1039	fwyp(j,i) = 0.0_wp
1040	ENDIF
1041	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1042	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1043	wall_w_x(j,i) = 1.0_wp
1044	fwxm(j,i) = 0.0_wp
1045	fwxp(j,i) = 1.0_wp
1046	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1047	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1048	wall_w_x(j,i) = 1.0_wp
1049	fwxm(j,i) = 1.0_wp
1050	fwxp(j,i) = 0.0_wp
1051	ENDIF
1052	!
1053	!-- Wall and corner locations inside buildings for limitation of
1054	!-- near-wall mixing length l_wall
1055	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1056
1057	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1058
1059	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1060	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1061	nzb_s_inner(j,i-1) ) + 1
1062	ENDIF
1063
1064	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1065	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1066	nzb_s_inner(j,i+1) ) + 1
1067	ENDIF
1068
1069	ENDIF
1070
1071	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1072
1073	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1074	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1075	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1076	nzb_s_inner(j,i-1) ) + 1
1077	ENDIF
1078
1079	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1080	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1081	nzb_s_inner(j,i+1) ) + 1
1082	ENDIF
1083
1084	ENDIF
1085
1086	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1087	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1088	ENDIF
1089
1090	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1091	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1092	ENDIF
1093
1094	ENDDO
1095	ENDDO
1096
1097	!
1098	!-- Calculate wall flag arrays for the multigrid method
1099	IF ( psolver(1:9) == 'multigrid' ) THEN
1100	!
1101	!-- Gridpoint increment of the current level
1102	inc = 1
1103
1104	DO l = maximum_grid_level, 1 , -1
1105
1106	nxl_l = nxl_mg(l)
1107	nxr_l = nxr_mg(l)
1108	nys_l = nys_mg(l)
1109	nyn_l = nyn_mg(l)
1110	nzt_l = nzt_mg(l)
1111
1112	!
1113	!-- Assign the flag level to be calculated
1114	SELECT CASE ( l )
1115	CASE ( 1 )
1116	flags => wall_flags_1
1117	CASE ( 2 )
1118	flags => wall_flags_2
1119	CASE ( 3 )
1120	flags => wall_flags_3
1121	CASE ( 4 )
1122	flags => wall_flags_4
1123	CASE ( 5 )
1124	flags => wall_flags_5
1125	CASE ( 6 )
1126	flags => wall_flags_6
1127	CASE ( 7 )
1128	flags => wall_flags_7
1129	CASE ( 8 )
1130	flags => wall_flags_8
1131	CASE ( 9 )
1132	flags => wall_flags_9
1133	CASE ( 10 )
1134	flags => wall_flags_10
1135	END SELECT
1136
1137	!
1138	!-- Depending on the grid level, set the respective bits in case of
1139	!-- neighbouring walls
1140	!-- Bit 0: wall to the bottom
1141	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1142	!-- Bit 2: wall to the south
1143	!-- Bit 3: wall to the north
1144	!-- Bit 4: wall to the left
1145	!-- Bit 5: wall to the right
1146	!-- Bit 6: inside building
1147
1148	flags = 0
1149
1150	!
1151	!-- In case of masking method, flags are not set and multigrid method
1152	!-- works like FFT-solver
1153	IF ( .NOT. masking_method ) THEN
1154
1155	DO i = nxl_l-1, nxr_l+1
1156	DO j = nys_l-1, nyn_l+1
1157	DO k = nzb, nzt_l+1
1158
1159	!
1160	!-- Inside/outside building (inside building does not need
1161	!-- further tests for walls)
1162	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1163
1164	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1165
1166	ELSE
1167	!
1168	!-- Bottom wall
1169	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1170	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1171	ENDIF
1172	!
1173	!-- South wall
1174	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1175	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1176	ENDIF
1177	!
1178	!-- North wall
1179	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1180	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1181	ENDIF
1182	!
1183	!-- Left wall
1184	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1185	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1186	ENDIF
1187	!
1188	!-- Right wall
1189	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1190	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1191	ENDIF
1192
1193	ENDIF
1194
1195	ENDDO
1196	ENDDO
1197	ENDDO
1198
1199	ENDIF
1200
1201	!
1202	!-- Test output of flag arrays
1203	! i = nxl_l
1204	! WRITE (9,*) ' '
1205	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1206	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1207	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1208	! DO k = nzt_l+1, nzb, -1
1209	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1210	! ENDDO
1211
1212	inc = inc * 2
1213
1214	ENDDO
1215
1216	ENDIF
1217	!
1218	!-- Allocate flags needed for masking walls.
1219	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1220	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1221	wall_flags_0 = 0
1222	wall_flags_00 = 0
1223
1224	IF ( scalar_advec == 'ws-scheme' .OR. &
1225	scalar_advec == 'ws-scheme-mono' ) THEN
1226	!
1227	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1228	!-- near topography, inflow- and outflow boundaries as well as bottom and
1229	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1230	!-- grid points.
1231	DO i = nxl, nxr
1232	DO j = nys, nyn
1233	DO k = nzb_s_inner(j,i)+1, nzt
1234	!
1235	!-- scalar - x-direction
1236	!-- WS1 (0), WS3 (1), WS5 (2)
1237	IF ( k <= nzb_s_inner(j,i+1) .OR. &
1238	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1239	.AND. i == nxl ) .OR. &
1240	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1241	.AND. i == nxr ) ) &
1242	THEN
1243	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1244	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1245	.OR. &
1246	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1247	.AND. i == nxr-1 ) .OR. &
1248	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1249	.AND. i == nxlu ) ) &
1250	THEN
1251	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1252	ELSE
1253	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1254	ENDIF
1255	!
1256	!-- scalar - y-direction
1257	!-- WS1 (3), WS3 (4), WS5 (5)
1258	IF ( k <= nzb_s_inner(j+1,i) .OR. &
1259	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1260	.AND. j == nys ) .OR. &
1261	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1262	.AND. j == nyn ) ) &
1263	THEN
1264	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1265	!
1266	!-- WS3
1267	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1268	.OR. &
1269	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1270	.AND. j == nysv ) .OR. &
1271	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1272	.AND. j == nyn-1 ) ) &
1273	THEN
1274	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1275	!
1276	!-- WS5
1277	ELSE
1278	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1279	ENDIF
1280	!
1281	!-- scalar - z-direction
1282	!-- WS1 (6), WS3 (7), WS5 (8)
1283	flag_set = .FALSE.
1284	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1285	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1286	flag_set = .TRUE.
1287	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1288	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1289	flag_set = .TRUE.
1290	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1291	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1292	ENDIF
1293	ENDDO
1294	ENDDO
1295	ENDDO
1296	ENDIF
1297
1298	IF ( momentum_advec == 'ws-scheme' ) THEN
1299	!
1300	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1301	!-- near topography, inflow- and outflow boundaries as well as bottom and
1302	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1303	!-- grid points.
1304	DO i = nxl, nxr
1305	DO j = nys, nyn
1306	DO k = nzb+1, nzt
1307	!
1308	!-- At first, set flags to WS1.
1309	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1310	!-- in order to handle the left/south flux.
1311	!-- near vertical walls.
1312	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1313	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1314	!
1315	!-- u component - x-direction
1316	!-- WS1 (9), WS3 (10), WS5 (11)
1317	IF ( k <= nzb_u_inner(j,i+1) .OR. &
1318	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1319	.AND. i <= nxlu ) .OR. &
1320	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1321	.AND. i == nxr ) ) &
1322	THEN
1323	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1324	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1325	.OR. &
1326	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1327	.AND. i == nxr-1 ) .OR. &
1328	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1329	.AND. i == nxlu+1) ) &
1330	THEN
1331	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1332	!
1333	!-- Clear flag for WS1
1334	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1335	ELSE
1336	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1337	!
1338	!-- Clear flag for WS1
1339	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1340	ENDIF
1341	!
1342	!-- u component - y-direction
1343	!-- WS1 (12), WS3 (13), WS5 (14)
1344	IF ( k <= nzb_u_inner(j+1,i) .OR. &
1345	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1346	.AND. j == nys ) .OR. &
1347	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1348	.AND. j == nyn ) ) &
1349	THEN
1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1351	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1352	.OR. &
1353	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1354	.AND. j == nysv ) .OR. &
1355	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1356	.AND. j == nyn-1 ) ) &
1357	THEN
1358	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1359	!
1360	!-- Clear flag for WS1
1361	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1362	ELSE
1363	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1364	!
1365	!-- Clear flag for WS1
1366	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1367	ENDIF
1368	!
1369	!-- u component - z-direction
1370	!-- WS1 (15), WS3 (16), WS5 (17)
1371	flag_set = .FALSE.
1372	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1373	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1374	flag_set = .TRUE.
1375	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1376	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1377	flag_set = .TRUE.
1378	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1379	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1380	ENDIF
1381
1382	ENDDO
1383	ENDDO
1384	ENDDO
1385
1386	DO i = nxl, nxr
1387	DO j = nys, nyn
1388	DO k = nzb+1, nzt
1389	!
1390	!-- At first, set flags to WS1.
1391	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1392	!-- in order to handle the left/south flux.
1393	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1394	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1395	!
1396	!-- v component - x-direction
1397	!-- WS1 (18), WS3 (19), WS5 (20)
1398	IF ( k <= nzb_v_inner(j,i+1) .OR. &
1399	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1400	.AND. i == nxl ) .OR. &
1401	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1402	.AND. i == nxr ) ) &
1403	THEN
1404	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1405	!
1406	!-- WS3
1407	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1408	.OR. &
1409	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1410	.AND. i == nxr-1 ) .OR. &
1411	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1412	.AND. i == nxlu ) ) &
1413	THEN
1414	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1415	!
1416	!-- Clear flag for WS1
1417	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1418	ELSE
1419	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1420	!
1421	!-- Clear flag for WS1
1422	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1423	ENDIF
1424	!
1425	!-- v component - y-direction
1426	!-- WS1 (21), WS3 (22), WS5 (23)
1427	IF ( k <= nzb_v_inner(j+1,i) .OR. &
1428	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1429	.AND. j <= nysv ) .OR. &
1430	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1431	.AND. j == nyn ) ) &
1432	THEN
1433	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1434	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1435	.OR. &
1436	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1437	.AND. j == nysv+1) .OR. &
1438	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1439	.AND. j == nyn-1 ) ) &
1440	THEN
1441	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1442	!
1443	!-- Clear flag for WS1
1444	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1445	ELSE
1446	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1447	!
1448	!-- Clear flag for WS1
1449	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1450	ENDIF
1451	!
1452	!-- v component - z-direction
1453	!-- WS1 (24), WS3 (25), WS5 (26)
1454	flag_set = .FALSE.
1455	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1456	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1457	flag_set = .TRUE.
1458	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1459	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1460	flag_set = .TRUE.
1461	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1462	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1463	ENDIF
1464
1465	ENDDO
1466	ENDDO
1467	ENDDO
1468	DO i = nxl, nxr
1469	DO j = nys, nyn
1470	DO k = nzb+1, nzt
1471	!
1472	!-- At first, set flags to WS1.
1473	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1474	!-- in order to handle the left/south flux.
1475	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1476	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1477	!
1478	!-- w component - x-direction
1479	!-- WS1 (27), WS3 (28), WS5 (29)
1480	IF ( k <= nzb_w_inner(j,i+1) .OR. &
1481	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1482	.AND. i == nxl ) .OR. &
1483	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1484	.AND. i == nxr ) ) &
1485	THEN
1486	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1487	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1488	.OR. &
1489	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1490	.AND. i == nxr-1 ) .OR. &
1491	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1492	.AND. i == nxlu ) ) &
1493	THEN
1494	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1495	!
1496	!-- Clear flag for WS1
1497	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1498	ELSE
1499	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1500	!
1501	!-- Clear flag for WS1
1502	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1503	ENDIF
1504	!
1505	!-- w component - y-direction
1506	!-- WS1 (30), WS3 (31), WS5 (32)
1507	IF ( k <= nzb_w_inner(j+1,i) .OR. &
1508	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1509	.AND. j == nys ) .OR. &
1510	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1511	.AND. j == nyn ) ) &
1512	THEN
1513	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1514	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1515	.OR. &
1516	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1517	.AND. j == nysv ) .OR. &
1518	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1519	.AND. j == nyn-1 ) ) &
1520	THEN
1521	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1522	!
1523	!-- Clear flag for WS1
1524	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1525	ELSE
1526	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1527	!
1528	!-- Clear flag for WS1
1529	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1530	ENDIF
1531	!
1532	!-- w component - z-direction
1533	!-- WS1 (33), WS3 (34), WS5 (35)
1534	flag_set = .FALSE.
1535	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1536	.OR. k == nzt ) THEN
1537	!
1538	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1539	!-- set, although this is not a prognostic level. However,
1540	!-- contrary to the advection of u,v and s this is necessary
1541	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1542	!-- at k == nzb_w_inner(j,i)+1.
1543	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1544	flag_set = .TRUE.
1545	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1546	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1547	flag_set = .TRUE.
1548	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1549	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1550	ENDIF
1551
1552	ENDDO
1553	ENDDO
1554	ENDDO
1555
1556	ENDIF
1557
1558	!
1559	!-- Exchange 3D integer wall_flags.
1560	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1561	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1562	!
1563	!-- Exchange ghost points for advection flags
1564	CALL exchange_horiz_int( wall_flags_0, nbgp )
1565	CALL exchange_horiz_int( wall_flags_00, nbgp )
1566	!
1567	!-- Set boundary flags at inflow and outflow boundary in case of
1568	!-- non-cyclic boundary conditions.
1569	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1570	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1571	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1572	ENDIF
1573
1574	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
1575	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1576	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1577	ENDIF
1578
1579	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
1580	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1581	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1582	ENDIF
1583
1584	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1585	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1586	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1587	ENDIF
1588
1589	ENDIF
1590
1591	!
1592	!-- In case of topography: limit near-wall mixing length l_wall further:
1593	!-- Go through all points of the subdomain one by one and look for the closest
1594	!-- surface
1595	IF ( TRIM(topography) /= 'flat' ) THEN
1596	DO i = nxl, nxr
1597	DO j = nys, nyn
1598
1599	nzb_si = nzb_s_inner(j,i)
1600	vi = vertical_influence(nzb_si)
1601
1602	IF ( wall_n(j,i) > 0 ) THEN
1603	!
1604	!-- North wall (y distance)
1605	DO k = wall_n(j,i), nzb_si
1606	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1607	ENDDO
1608	!
1609	!-- Above North wall (yz distance)
1610	DO k = nzb_si + 1, nzb_si + vi
1611	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1612	SQRT( 0.25_wp * dy**2 + &
1613	( zu(k) - zw(nzb_si) )**2 ) )
1614	ENDDO
1615	!
1616	!-- Northleft corner (xy distance)
1617	IF ( corner_nl(j,i) > 0 ) THEN
1618	DO k = corner_nl(j,i), nzb_si
1619	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1620	0.5_wp * SQRT( dx2 + dy2 ) )
1621	ENDDO
1622	!
1623	!-- Above Northleft corner (xyz distance)
1624	DO k = nzb_si + 1, nzb_si + vi
1625	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1626	SQRT( 0.25_wp * (dx2 + dy2) + &
1627	( zu(k) - zw(nzb_si) )**2 ) )
1628	ENDDO
1629	ENDIF
1630	!
1631	!-- Northright corner (xy distance)
1632	IF ( corner_nr(j,i) > 0 ) THEN
1633	DO k = corner_nr(j,i), nzb_si
1634	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1635	0.5_wp * SQRT( dx2 + dy2 ) )
1636	ENDDO
1637	!
1638	!-- Above northright corner (xyz distance)
1639	DO k = nzb_si + 1, nzb_si + vi
1640	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1641	SQRT( 0.25_wp * (dx2 + dy2) + &
1642	( zu(k) - zw(nzb_si) )**2 ) )
1643	ENDDO
1644	ENDIF
1645	ENDIF
1646
1647	IF ( wall_s(j,i) > 0 ) THEN
1648	!
1649	!-- South wall (y distance)
1650	DO k = wall_s(j,i), nzb_si
1651	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1652	ENDDO
1653	!
1654	!-- Above south wall (yz distance)
1655	DO k = nzb_si + 1, nzb_si + vi
1656	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1657	SQRT( 0.25_wp * dy**2 + &
1658	( zu(k) - zw(nzb_si) )**2 ) )
1659	ENDDO
1660	!
1661	!-- Southleft corner (xy distance)
1662	IF ( corner_sl(j,i) > 0 ) THEN
1663	DO k = corner_sl(j,i), nzb_si
1664	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1665	0.5_wp * SQRT( dx2 + dy2 ) )
1666	ENDDO
1667	!
1668	!-- Above southleft corner (xyz distance)
1669	DO k = nzb_si + 1, nzb_si + vi
1670	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1671	SQRT( 0.25_wp * (dx2 + dy2) + &
1672	( zu(k) - zw(nzb_si) )**2 ) )
1673	ENDDO
1674	ENDIF
1675	!
1676	!-- Southright corner (xy distance)
1677	IF ( corner_sr(j,i) > 0 ) THEN
1678	DO k = corner_sr(j,i), nzb_si
1679	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1680	0.5_wp * SQRT( dx2 + dy2 ) )
1681	ENDDO
1682	!
1683	!-- Above southright corner (xyz distance)
1684	DO k = nzb_si + 1, nzb_si + vi
1685	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1686	SQRT( 0.25_wp * (dx2 + dy2) + &
1687	( zu(k) - zw(nzb_si) )**2 ) )
1688	ENDDO
1689	ENDIF
1690
1691	ENDIF
1692
1693	IF ( wall_l(j,i) > 0 ) THEN
1694	!
1695	!-- Left wall (x distance)
1696	DO k = wall_l(j,i), nzb_si
1697	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1698	ENDDO
1699	!
1700	!-- Above left wall (xz distance)
1701	DO k = nzb_si + 1, nzb_si + vi
1702	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1703	SQRT( 0.25_wp * dx**2 + &
1704	( zu(k) - zw(nzb_si) )**2 ) )
1705	ENDDO
1706	ENDIF
1707
1708	IF ( wall_r(j,i) > 0 ) THEN
1709	!
1710	!-- Right wall (x distance)
1711	DO k = wall_r(j,i), nzb_si
1712	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1713	ENDDO
1714	!
1715	!-- Above right wall (xz distance)
1716	DO k = nzb_si + 1, nzb_si + vi
1717	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1718	SQRT( 0.25_wp * dx**2 + &
1719	( zu(k) - zw(nzb_si) )**2 ) )
1720	ENDDO
1721
1722	ENDIF
1723
1724	ENDDO
1725	ENDDO
1726
1727	ENDIF
1728
1729	!
1730	!-- Multiplication with wall_adjustment_factor
1731	l_wall = wall_adjustment_factor * l_wall
1732
1733	!
1734	!-- Set lateral boundary conditions for l_wall
1735	CALL exchange_horiz( l_wall, nbgp )
1736
1737	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1738	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1739
1740
1741	END SUBROUTINE init_grid

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