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source: palm/trunk/SOURCE/init_grid.f90 @ 1787

Last change on this file since 1787 was 1780, checked in by raasch, 8 years ago
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1	!> @file init_grid.f90
2	!-------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2015 Leibniz Universitaet Hannover
17	!-------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! -----------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_grid.f90 1780 2016-03-03 08:39:40Z raasch $
26	!
27	! 1779 2016-03-03 08:01:28Z raasch
28	! coupling_char is trimmed at every place it occurs, because it can have
29	! different length now
30	!
31	! 1762 2016-02-25 12:31:13Z hellstea
32	! Introduction of nested domain feature
33	!
34	! 1743 2016-01-13 10:23:51Z raasch
35	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
36	! total domain
37	!
38	! 1691 2015-10-26 16:17:44Z maronga
39	! Renamed prandtl_layer to constant_flux_layer.
40	!
41	! 1682 2015-10-07 23:56:08Z knoop
42	! Code annotations made doxygen readable
43	!
44	! 1677 2015-10-02 13:25:23Z boeske
45	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
46	!
47	! 1675 2015-10-02 08:28:59Z gronemeier
48	! Bugfix: Definition of topography grid levels
49	!
50	! 1660 2015-09-21 08:15:16Z gronemeier
51	! Bugfix: Definition of topography grid levels if vertical grid stretching
52	! starts below the maximum topography height.
53	!
54	! 1580 2015-04-10 13:43:49Z suehring
55	! Bugfix: setting flags for 5th order scheme near buildings
56	!
57	! 1575 2015-03-27 09:56:27Z raasch
58	! adjustments for psolver-queries
59	!
60	! 1557 2015-03-05 16:43:04Z suehring
61	! Adjustment for monotoinic limiter
62	!
63	! 1418 2014-06-06 13:05:08Z fricke
64	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
65	! condition and a negative value for dz_stretch_level the condition
66	! was always true for the whole model domain
67	!
68	! 1409 2014-05-23 12:11:32Z suehring
69	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
70	! j <= nysv
71	!
72	! 1353 2014-04-08 15:21:23Z heinze
73	! REAL constants provided with KIND-attribute
74	!
75	! 1322 2014-03-20 16:38:49Z raasch
76	! REAL constants defined as wp-kind
77	!
78	! 1320 2014-03-20 08:40:49Z raasch
79	! ONLY-attribute added to USE-statements,
80	! kind-parameters added to all INTEGER and REAL declaration statements,
81	! kinds are defined in new module kinds,
82	! revision history before 2012 removed,
83	! comment fields (!:) to be used for variable explanations added to
84	! all variable declaration statements
85	!
86	! 1221 2013-09-10 08:59:13Z raasch
87	! wall_flags_00 introduced to hold bits 32-63,
88	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
89	! loops optimized for openACC (pres + flow_statistics)
90	!
91	! 1092 2013-02-02 11:24:22Z raasch
92	! unused variables removed
93	!
94	! 1069 2012-11-28 16:18:43Z maronga
95	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
96	! ocean model in case of coupled runs
97	!
98	! 1036 2012-10-22 13:43:42Z raasch
99	! code put under GPL (PALM 3.9)
100	!
101	! 1015 2012-09-27 09:23:24Z raasch
102	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
103	! nzb_w_inner+1
104	!
105	! 996 2012-09-07 10:41:47Z raasch
106	! little reformatting
107	!
108	! 978 2012-08-09 08:28:32Z fricke
109	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
110	! Bugfix: Set wall_flags_0 for inflow boundary
111	!
112	! 927 2012-06-06 19:15:04Z raasch
113	! Wall flags are not set for multigrid method in case of masking method
114	!
115	! 864 2012-03-27 15:10:33Z gryschka
116	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
117	! were not correctly defined for k=1.
118	!
119	! 861 2012-03-26 14:18:34Z suehring
120	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
121	! inflow and outflow boundaries as well as near the bottom and the top of the
122	! model domain.!
123	! Initialization of nzb_s_inner and nzb_w_inner.
124	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
125	! while setting wall_flags_0
126	!
127	! 843 2012-02-29 15:16:21Z gryschka
128	! In case of ocean and dirichlet bc for u and v at the bottom
129	! the first u-level ist defined at same height as the first w-level
130	!
131	! 818 2012-02-08 16:11:23Z maronga
132	! Bugfix: topo_height is only required if topography is used. It is thus now
133	! allocated in the topography branch
134	!
135	! 809 2012-01-30 13:32:58Z maronga
136	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
137	!
138	! 807 2012-01-25 11:53:51Z maronga
139	! New cpp directive "__check" implemented which is used by check_namelist_files
140	!
141	! Revision 1.1 1997/08/11 06:17:45 raasch
142	! Initial revision (Testversion)
143	!
144	!
145	! Description:
146	! ------------
147	!> Creating grid depending constants
148	!------------------------------------------------------------------------------!
149	SUBROUTINE init_grid
150
151
152	USE arrays_3d, &
153	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
154	f2_mg, f3_mg, l_grid, l_wall, zu, zw
155
156	USE control_parameters, &
157	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
158	building_length_y, building_wall_left, building_wall_south, &
159	canyon_height, canyon_wall_left, canyon_wall_south, &
160	canyon_width_x, canyon_width_y, constant_flux_layer, &
161	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
162	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
163	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
164	masking_method, maximum_grid_level, message_string, &
165	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
166	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
167	outflow_r, outflow_s, psolver, scalar_advec, topography, &
168	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
169	wall_adjustment_factor
170
171	USE grid_variables, &
172	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
173	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
174	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
175
176	USE indices, &
177	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
178	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
179	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
180	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
181	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
182	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
183	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
184	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
185	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
186	wall_flags_9
187
188	USE kinds
189
190	USE pegrid
191
192	IMPLICIT NONE
193
194	INTEGER(iwp) :: bh !<
195	INTEGER(iwp) :: blx !<
196	INTEGER(iwp) :: bly !<
197	INTEGER(iwp) :: bxl !<
198	INTEGER(iwp) :: bxr !<
199	INTEGER(iwp) :: byn !<
200	INTEGER(iwp) :: bys !<
201	INTEGER(iwp) :: ch !<
202	INTEGER(iwp) :: cwx !<
203	INTEGER(iwp) :: cwy !<
204	INTEGER(iwp) :: cxl !<
205	INTEGER(iwp) :: cxr !<
206	INTEGER(iwp) :: cyn !<
207	INTEGER(iwp) :: cys !<
208	INTEGER(iwp) :: gls !<
209	INTEGER(iwp) :: i !<
210	INTEGER(iwp) :: ii !<
211	INTEGER(iwp) :: inc !<
212	INTEGER(iwp) :: j !<
213	INTEGER(iwp) :: k !<
214	INTEGER(iwp) :: l !<
215	INTEGER(iwp) :: nxl_l !<
216	INTEGER(iwp) :: nxr_l !<
217	INTEGER(iwp) :: nyn_l !<
218	INTEGER(iwp) :: nys_l !<
219	INTEGER(iwp) :: nzb_si !<
220	INTEGER(iwp) :: nzt_l !<
221	INTEGER(iwp) :: vi !<
222
223	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
224
225	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
226	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
227	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
228	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
229	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
230	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
231	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
232	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
233	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
234	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
235
236	LOGICAL :: flag_set = .FALSE. !<
237
238	REAL(wp) :: dx_l !<
239	REAL(wp) :: dy_l !<
240	REAL(wp) :: dz_stretched !<
241
242	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
243
244
245	!
246	!-- Calculation of horizontal array bounds including ghost layers
247	nxlg = nxl - nbgp
248	nxrg = nxr + nbgp
249	nysg = nys - nbgp
250	nyng = nyn + nbgp
251
252	!
253	!-- Allocate grid arrays
254	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
255	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
256
257	!
258	!-- Compute height of u-levels from constant grid length and dz stretch factors
259	IF ( dz == -1.0_wp ) THEN
260	message_string = 'missing dz'
261	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
262	ELSEIF ( dz <= 0.0_wp ) THEN
263	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
264	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
265	ENDIF
266
267	!
268	!-- Define the vertical grid levels
269	IF ( .NOT. ocean ) THEN
270	!
271	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
272	!-- The second u-level (k=1) corresponds to the top of the
273	!-- Prandtl-layer.
274
275	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
276	zu(0) = 0.0_wp
277	! zu(0) = - dz * 0.5_wp
278	ELSE
279	zu(0) = - dz * 0.5_wp
280	ENDIF
281	zu(1) = dz * 0.5_wp
282
283	dz_stretch_level_index = nzt+1
284	dz_stretched = dz
285	DO k = 2, nzt+1
286	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
287	dz_stretched = dz_stretched * dz_stretch_factor
288	dz_stretched = MIN( dz_stretched, dz_max )
289	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
290	ENDIF
291	zu(k) = zu(k-1) + dz_stretched
292	ENDDO
293
294	!
295	!-- Compute the w-levels. They are always staggered half-way between the
296	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
297	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
298	!-- The top w-level is extrapolated linearly.
299	zw(0) = 0.0_wp
300	DO k = 1, nzt
301	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
302	ENDDO
303	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
304
305	ELSE
306	!
307	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
308	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
309	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
310	!-- w-level are defined at same height, but staggered from the second level.
311	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
312	zu(nzt+1) = dz * 0.5_wp
313	zu(nzt) = - dz * 0.5_wp
314
315	dz_stretch_level_index = 0
316	dz_stretched = dz
317	DO k = nzt-1, 0, -1
318	!
319	!-- The default value of dz_stretch_level is positive, thus the first
320	!-- condition is always true. Hence, the second condition is necessary.
321	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
322	.AND. dz_stretched < dz_max ) THEN
323	dz_stretched = dz_stretched * dz_stretch_factor
324	dz_stretched = MIN( dz_stretched, dz_max )
325	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
326	ENDIF
327	zu(k) = zu(k+1) - dz_stretched
328	ENDDO
329
330	!
331	!-- Compute the w-levels. They are always staggered half-way between the
332	!-- corresponding u-levels, except in case of dirichlet bc for u and v
333	!-- at the ground. In this case the first u- and w-level are defined at
334	!-- same height. The top w-level (nzt+1) is not used but set for
335	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
336	zw(nzt+1) = dz
337	zw(nzt) = 0.0_wp
338	DO k = 0, nzt
339	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
340	ENDDO
341
342	!
343	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
344	!-- at same height.
345	IF ( ibc_uv_b == 0 ) THEN
346	zu(0) = zw(0)
347	ENDIF
348
349	ENDIF
350
351	!
352	!-- Compute grid lengths.
353	DO k = 1, nzt+1
354	dzu(k) = zu(k) - zu(k-1)
355	ddzu(k) = 1.0_wp / dzu(k)
356	dzw(k) = zw(k) - zw(k-1)
357	ddzw(k) = 1.0_wp / dzw(k)
358	ENDDO
359
360	DO k = 1, nzt
361	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
362	ENDDO
363
364	!
365	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
366	!-- everywhere. For the actual grid, the grid spacing at the lowest level
367	!-- is only dz/2, but should be dz. Therefore, an additional array
368	!-- containing with appropriate grid information is created for these
369	!-- solvers.
370	IF ( psolver(1:9) /= 'multigrid' ) THEN
371	ALLOCATE( ddzu_pres(1:nzt+1) )
372	ddzu_pres = ddzu
373	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
374	ENDIF
375
376	!
377	!-- In case of multigrid method, compute grid lengths and grid factors for the
378	!-- grid levels
379	IF ( psolver(1:9) == 'multigrid' ) THEN
380
381	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
382	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
383	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
384	f1_mg(nzb+1:nzt,maximum_grid_level), &
385	f2_mg(nzb+1:nzt,maximum_grid_level), &
386	f3_mg(nzb+1:nzt,maximum_grid_level) )
387
388	dzu_mg(:,maximum_grid_level) = dzu
389	!
390	!-- Next line to ensure an equally spaced grid.
391	dzu_mg(1,maximum_grid_level) = dzu(2)
392
393	dzw_mg(:,maximum_grid_level) = dzw
394	nzt_l = nzt
395	DO l = maximum_grid_level-1, 1, -1
396	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
397	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
398	nzt_l = nzt_l / 2
399	DO k = 2, nzt_l+1
400	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
401	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
402	ENDDO
403	ENDDO
404
405	nzt_l = nzt
406	dx_l = dx
407	dy_l = dy
408	DO l = maximum_grid_level, 1, -1
409	ddx2_mg(l) = 1.0_wp / dx_l**2
410	ddy2_mg(l) = 1.0_wp / dy_l**2
411	DO k = nzb+1, nzt_l
412	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
413	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
414	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
415	f2_mg(k,l) + f3_mg(k,l)
416	ENDDO
417	nzt_l = nzt_l / 2
418	dx_l = dx_l * 2.0_wp
419	dy_l = dy_l * 2.0_wp
420	ENDDO
421
422	ENDIF
423
424	!
425	!-- Compute the reciprocal values of the horizontal grid lengths.
426	ddx = 1.0_wp / dx
427	ddy = 1.0_wp / dy
428	dx2 = dx * dx
429	dy2 = dy * dy
430	ddx2 = 1.0_wp / dx2
431	ddy2 = 1.0_wp / dy2
432
433	!
434	!-- Compute the grid-dependent mixing length.
435	DO k = 1, nzt
436	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
437	ENDDO
438
439	!
440	!-- Allocate outer and inner index arrays for topography and set
441	!-- defaults.
442	!-- nzb_local has to contain additional layers of ghost points for calculating
443	!-- the flag arrays needed for the multigrid method
444	gls = 2**( maximum_grid_level )
445	IF ( gls < nbgp ) gls = nbgp
446
447	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
448	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
449	nzb_local(-gls:ny+gls,-gls:nx+gls), &
450	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
451	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
452	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
453	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
454	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
455	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
456	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
457	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
458	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
459	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
460	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
461	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
462	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
463	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
464	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
465	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
466	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
467	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
468	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
469	nzb_2d(nysg:nyng,nxlg:nxrg), &
470	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
471	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
472	wall_e_x(nysg:nyng,nxlg:nxrg), &
473	wall_e_y(nysg:nyng,nxlg:nxrg), &
474	wall_u(nysg:nyng,nxlg:nxrg), &
475	wall_v(nysg:nyng,nxlg:nxrg), &
476	wall_w_x(nysg:nyng,nxlg:nxrg), &
477	wall_w_y(nysg:nyng,nxlg:nxrg) )
478
479
480
481	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
482
483
484	nzb_s_inner = nzb; nzb_s_outer = nzb
485	nzb_u_inner = nzb; nzb_u_outer = nzb
486	nzb_v_inner = nzb; nzb_v_outer = nzb
487	nzb_w_inner = nzb; nzb_w_outer = nzb
488
489	rflags_s_inner = 1.0_wp
490	rflags_invers = 1.0_wp
491
492	!
493	!-- Define vertical gridpoint from (or to) which on the usual finite difference
494	!-- form (which does not use surface fluxes) is applied
495	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
496	nzb_diff = nzb + 2
497	ELSE
498	nzb_diff = nzb + 1
499	ENDIF
500	IF ( use_top_fluxes ) THEN
501	nzt_diff = nzt - 1
502	ELSE
503	nzt_diff = nzt
504	ENDIF
505
506	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
507	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
508
509	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
510	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
511	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
512	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
513
514	!
515	!-- Initialize near-wall mixing length l_wall only in the vertical direction
516	!-- for the moment,
517	!-- multiplication with wall_adjustment_factor near the end of this routine
518	l_wall(nzb,:,:) = l_grid(1)
519	DO k = nzb+1, nzt
520	l_wall(k,:,:) = l_grid(k)
521	ENDDO
522	l_wall(nzt+1,:,:) = l_grid(nzt)
523
524	ALLOCATE ( vertical_influence(nzb:nzt) )
525	DO k = 1, nzt
526	vertical_influence(k) = MIN ( INT( l_grid(k) / &
527	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
528	ENDDO
529
530	DO k = 1, MAXVAL( nzb_s_inner )
531	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
532	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
533	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
534	'threshold given by only local', &
535	' &horizontal reduction of near_wall ', &
536	'mixing length l_wall', &
537	' &starting from height level k = ', k, '.'
538	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
539	EXIT
540	ENDIF
541	ENDDO
542	vertical_influence(0) = vertical_influence(1)
543
544	DO i = nxlg, nxrg
545	DO j = nysg, nyng
546	DO k = nzb_s_inner(j,i) + 1, &
547	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
548	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
549	ENDDO
550	ENDDO
551	ENDDO
552
553	!
554	!-- Set outer and inner index arrays for non-flat topography.
555	!-- Here consistency checks concerning domain size and periodicity are
556	!-- necessary.
557	!-- Within this SELECT CASE structure only nzb_local is initialized
558	!-- individually depending on the chosen topography type, all other index
559	!-- arrays are initialized further below.
560	SELECT CASE ( TRIM( topography ) )
561
562	CASE ( 'flat' )
563	!
564	!-- nzb_local is required for the multigrid solver
565	nzb_local = 0
566
567	CASE ( 'single_building' )
568	!
569	!-- Single rectangular building, by default centered in the middle of the
570	!-- total domain
571	blx = NINT( building_length_x / dx )
572	bly = NINT( building_length_y / dy )
573	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
574	IF ( ABS( zw(bh ) - building_height ) == &
575	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
576
577	IF ( building_wall_left == 9999999.9_wp ) THEN
578	building_wall_left = ( nx + 1 - blx ) / 2 * dx
579	ENDIF
580	bxl = NINT( building_wall_left / dx )
581	bxr = bxl + blx
582
583	IF ( building_wall_south == 9999999.9_wp ) THEN
584	building_wall_south = ( ny + 1 - bly ) / 2 * dy
585	ENDIF
586	bys = NINT( building_wall_south / dy )
587	byn = bys + bly
588
589	!
590	!-- Building size has to meet some requirements
591	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
592	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
593	WRITE( message_string, * ) 'inconsistent building parameters:', &
594	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
595	'byn=', byn, 'nx=', nx, 'ny=', ny
596	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
597	ENDIF
598
599	!
600	!-- Define the building.
601	nzb_local = 0
602	nzb_local(bys:byn,bxl:bxr) = bh
603
604	CASE ( 'single_street_canyon' )
605	!
606	!-- Single quasi-2D street canyon of infinite length in x or y direction.
607	!-- The canyon is centered in the other direction by default.
608	IF ( canyon_width_x /= 9999999.9_wp ) THEN
609	!
610	!-- Street canyon in y direction
611	cwx = NINT( canyon_width_x / dx )
612	IF ( canyon_wall_left == 9999999.9_wp ) THEN
613	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
614	ENDIF
615	cxl = NINT( canyon_wall_left / dx )
616	cxr = cxl + cwx
617
618	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
619	!
620	!-- Street canyon in x direction
621	cwy = NINT( canyon_width_y / dy )
622	IF ( canyon_wall_south == 9999999.9_wp ) THEN
623	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
624	ENDIF
625	cys = NINT( canyon_wall_south / dy )
626	cyn = cys + cwy
627
628	ELSE
629
630	message_string = 'no street canyon width given'
631	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
632
633	ENDIF
634
635	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
636	IF ( ABS( zw(ch ) - canyon_height ) == &
637	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
638
639	dp_level_ind_b = ch
640	!
641	!-- Street canyon size has to meet some requirements
642	IF ( canyon_width_x /= 9999999.9_wp ) THEN
643	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
644	( ch < 3 ) ) THEN
645	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
646	'&cxl=', cxl, 'cxr=', cxr, &
647	'cwx=', cwx, &
648	'ch=', ch, 'nx=', nx, 'ny=', ny
649	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
650	ENDIF
651	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
652	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
653	( ch < 3 ) ) THEN
654	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
655	'&cys=', cys, 'cyn=', cyn, &
656	'cwy=', cwy, &
657	'ch=', ch, 'nx=', nx, 'ny=', ny
658	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
659	ENDIF
660	ENDIF
661	IF ( canyon_width_x /= 9999999.9_wp .AND. &
662	canyon_width_y /= 9999999.9_wp ) THEN
663	message_string = 'inconsistent canyon parameters:' // &
664	'&street canyon can only be oriented' // &
665	'&either in x- or in y-direction'
666	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
667	ENDIF
668
669	nzb_local = ch
670	IF ( canyon_width_x /= 9999999.9_wp ) THEN
671	nzb_local(:,cxl+1:cxr-1) = 0
672	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
673	nzb_local(cys+1:cyn-1,:) = 0
674	ENDIF
675
676	CASE ( 'read_from_file' )
677
678	ALLOCATE ( topo_height(0:ny,0:nx) )
679
680	DO ii = 0, io_blocks-1
681	IF ( ii == io_group ) THEN
682
683	!
684	!-- Arbitrary irregular topography data in PALM format (exactly
685	!-- matching the grid size and total domain size)
686	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
687	STATUS='OLD', FORM='FORMATTED', ERR=10 )
688	DO j = ny, 0, -1
689	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
690	ENDDO
691
692	GOTO 12
693
694	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
695	' does not exist'
696	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
697
698	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
699	TRIM( coupling_char )
700	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
701
702	12 CLOSE( 90 )
703
704	ENDIF
705	#if defined( __parallel ) && ! defined ( __check )
706	CALL MPI_BARRIER( comm2d, ierr )
707	#endif
708	ENDDO
709
710	!
711	!-- Calculate the index height of the topography
712	DO i = 0, nx
713	DO j = 0, ny
714	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
715	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
716	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
717	nzb_local(j,i) = nzb_local(j,i) + 1
718	ENDDO
719	ENDDO
720
721	DEALLOCATE ( topo_height )
722	!
723	!-- Add cyclic boundaries (additional layers are for calculating
724	!-- flag arrays needed for the multigrid sover)
725	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
726	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
727	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
728	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
729
730	CASE DEFAULT
731	!
732	!-- The DEFAULT case is reached either if the parameter topography
733	!-- contains a wrong character string or if the user has defined a special
734	!-- case in the user interface. There, the subroutine user_init_grid
735	!-- checks which of these two conditions applies.
736	CALL user_init_grid( gls, nzb_local )
737
738	END SELECT
739	!
740	!-- Determine the maximum level of topography. Furthermore it is used for
741	!-- steering the degradation of order of the applied advection scheme.
742	!-- In case of non-cyclic lateral boundaries, the order of the advection
743	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
744	nzb_max = MAXVAL( nzb_local ) + 1
745	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
746	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
747	nest_domain ) &
748	THEN
749	nzb_max = nzt
750	ENDIF
751
752	!
753	!-- Consistency checks and index array initialization are only required for
754	!-- non-flat topography, also the initialization of topography height arrays
755	!-- zu_s_inner and zw_w_inner
756	IF ( TRIM( topography ) /= 'flat' ) THEN
757
758	!
759	!-- Consistency checks
760	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
761	WRITE( message_string, * ) 'nzb_local values are outside the', &
762	'model domain', &
763	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
764	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
765	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
766	ENDIF
767
768	IF ( bc_lr == 'cyclic' ) THEN
769	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
770	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
771	message_string = 'nzb_local does not fulfill cyclic' // &
772	' boundary condition in x-direction'
773	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
774	ENDIF
775	ENDIF
776	IF ( bc_ns == 'cyclic' ) THEN
777	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
778	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
779	message_string = 'nzb_local does not fulfill cyclic' // &
780	' boundary condition in y-direction'
781	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
782	ENDIF
783	ENDIF
784
785	IF ( topography_grid_convention == 'cell_edge' ) THEN
786	!
787	!-- The array nzb_local as defined using the 'cell_edge' convention
788	!-- describes the actual total size of topography which is defined at the
789	!-- cell edges where u=0 on the topography walls in x-direction and v=0
790	!-- on the topography walls in y-direction. However, PALM uses individual
791	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
792	!-- Therefore, the extent of topography in nzb_local is now reduced by
793	!-- 1dx at the E topography walls and by 1dy at the N topography walls
794	!-- to form the basis for nzb_s_inner.
795	DO j = -gls, ny + gls
796	DO i = -gls, nx
797	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
798	ENDDO
799	ENDDO
800	!-- apply cyclic boundary conditions in x-direction
801	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
802	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
803	DO i = -gls, nx + gls
804	DO j = -gls, ny
805	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
806	ENDDO
807	ENDDO
808	!-- apply cyclic boundary conditions in y-direction
809	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
810	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
811	ENDIF
812
813	!
814	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
815	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
816	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
817
818	!
819	!-- Initialize remaining index arrays:
820	!-- first pre-initialize them with nzb_s_inner...
821	nzb_u_inner = nzb_s_inner
822	nzb_u_outer = nzb_s_inner
823	nzb_v_inner = nzb_s_inner
824	nzb_v_outer = nzb_s_inner
825	nzb_w_outer = nzb_s_inner
826	nzb_s_outer = nzb_s_inner
827
828	!
829	!-- ...then extend pre-initialized arrays in their according directions
830	!-- based on nzb_local using nzb_tmp as a temporary global index array
831
832	!
833	!-- nzb_s_outer:
834	!-- extend nzb_local east-/westwards first, then north-/southwards
835	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
836	DO j = -1, ny + 1
837	DO i = 0, nx
838	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
839	nzb_local(j,i+1) )
840	ENDDO
841	ENDDO
842	DO i = nxl, nxr
843	DO j = nys, nyn
844	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
845	nzb_tmp(j+1,i) )
846	ENDDO
847	!
848	!-- non-cyclic boundary conditions (overwritten by call of
849	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
850	IF ( nys == 0 ) THEN
851	j = -1
852	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
853	ENDIF
854	IF ( nyn == ny ) THEN
855	j = ny + 1
856	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
857	ENDIF
858	ENDDO
859	!
860	!-- nzb_w_outer:
861	!-- identical to nzb_s_outer
862	nzb_w_outer = nzb_s_outer
863
864	!
865	!-- nzb_u_inner:
866	!-- extend nzb_local rightwards only
867	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
868	DO j = -1, ny + 1
869	DO i = 0, nx + 1
870	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
871	ENDDO
872	ENDDO
873	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
874
875	!
876	!-- nzb_u_outer:
877	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
878	DO i = nxl, nxr
879	DO j = nys, nyn
880	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
881	nzb_tmp(j+1,i) )
882	ENDDO
883	!
884	!-- non-cyclic boundary conditions (overwritten by call of
885	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
886	IF ( nys == 0 ) THEN
887	j = -1
888	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
889	ENDIF
890	IF ( nyn == ny ) THEN
891	j = ny + 1
892	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
893	ENDIF
894	ENDDO
895
896	!
897	!-- nzb_v_inner:
898	!-- extend nzb_local northwards only
899	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
900	DO i = -1, nx + 1
901	DO j = 0, ny + 1
902	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
903	ENDDO
904	ENDDO
905	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
906
907	!
908	!-- nzb_v_outer:
909	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
910	DO j = nys, nyn
911	DO i = nxl, nxr
912	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
913	nzb_tmp(j,i+1) )
914	ENDDO
915	!
916	!-- non-cyclic boundary conditions (overwritten by call of
917	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
918	IF ( nxl == 0 ) THEN
919	i = -1
920	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
921	ENDIF
922	IF ( nxr == nx ) THEN
923	i = nx + 1
924	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
925	ENDIF
926	ENDDO
927	#if ! defined ( __check )
928	!
929	!-- Exchange of lateral boundary values (parallel computers) and cyclic
930	!-- boundary conditions, if applicable.
931	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
932	!-- they do not require exchange and are not included here.
933	CALL exchange_horiz_2d_int( nzb_u_inner )
934	CALL exchange_horiz_2d_int( nzb_u_outer )
935	CALL exchange_horiz_2d_int( nzb_v_inner )
936	CALL exchange_horiz_2d_int( nzb_v_outer )
937	CALL exchange_horiz_2d_int( nzb_w_outer )
938	CALL exchange_horiz_2d_int( nzb_s_outer )
939
940	!
941	!-- Allocate and set the arrays containing the topography height
942	IF ( myid == 0 ) THEN
943
944	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
945
946	DO i = 0, nx + 1
947	DO j = 0, ny + 1
948	zu_s_inner(i,j) = zu(nzb_local(j,i))
949	zw_w_inner(i,j) = zw(nzb_local(j,i))
950	ENDDO
951	ENDDO
952
953	ENDIF
954	!
955	!-- Set flag arrays to be used for masking of grid points
956	DO i = nxlg, nxrg
957	DO j = nysg, nyng
958	DO k = nzb, nzt+1
959	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
960	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
961	ENDDO
962	ENDDO
963	ENDDO
964	#endif
965	ENDIF
966
967	#if ! defined ( __check )
968	!
969	!-- Preliminary: to be removed after completion of the topography code!
970	!-- Set the former default k index arrays nzb_2d
971	nzb_2d = nzb
972
973	!
974	!-- Set the individual index arrays which define the k index from which on
975	!-- the usual finite difference form (which does not use surface fluxes) is
976	!-- applied
977	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
978	nzb_diff_u = nzb_u_inner + 2
979	nzb_diff_v = nzb_v_inner + 2
980	nzb_diff_s_inner = nzb_s_inner + 2
981	nzb_diff_s_outer = nzb_s_outer + 2
982	ELSE
983	nzb_diff_u = nzb_u_inner + 1
984	nzb_diff_v = nzb_v_inner + 1
985	nzb_diff_s_inner = nzb_s_inner + 1
986	nzb_diff_s_outer = nzb_s_outer + 1
987	ENDIF
988
989	!
990	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
991	!-- for limitation of near-wall mixing length l_wall further below
992	corner_nl = 0
993	corner_nr = 0
994	corner_sl = 0
995	corner_sr = 0
996	wall_l = 0
997	wall_n = 0
998	wall_r = 0
999	wall_s = 0
1000
1001	DO i = nxl, nxr
1002	DO j = nys, nyn
1003	!
1004	!-- u-component
1005	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
1006	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1007	fym(j,i) = 0.0_wp
1008	fyp(j,i) = 1.0_wp
1009	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
1010	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
1011	fym(j,i) = 1.0_wp
1012	fyp(j,i) = 0.0_wp
1013	ENDIF
1014	!
1015	!-- v-component
1016	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1017	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1018	fxm(j,i) = 0.0_wp
1019	fxp(j,i) = 1.0_wp
1020	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1021	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1022	fxm(j,i) = 1.0_wp
1023	fxp(j,i) = 0.0_wp
1024	ENDIF
1025	!
1026	!-- w-component, also used for scalars, separate arrays for shear
1027	!-- production of tke
1028	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1029	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1030	wall_w_y(j,i) = 1.0_wp
1031	fwym(j,i) = 0.0_wp
1032	fwyp(j,i) = 1.0_wp
1033	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1034	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1035	wall_w_y(j,i) = 1.0_wp
1036	fwym(j,i) = 1.0_wp
1037	fwyp(j,i) = 0.0_wp
1038	ENDIF
1039	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1040	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1041	wall_w_x(j,i) = 1.0_wp
1042	fwxm(j,i) = 0.0_wp
1043	fwxp(j,i) = 1.0_wp
1044	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1045	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1046	wall_w_x(j,i) = 1.0_wp
1047	fwxm(j,i) = 1.0_wp
1048	fwxp(j,i) = 0.0_wp
1049	ENDIF
1050	!
1051	!-- Wall and corner locations inside buildings for limitation of
1052	!-- near-wall mixing length l_wall
1053	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1054
1055	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1056
1057	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1058	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1059	nzb_s_inner(j,i-1) ) + 1
1060	ENDIF
1061
1062	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1063	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1064	nzb_s_inner(j,i+1) ) + 1
1065	ENDIF
1066
1067	ENDIF
1068
1069	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1070
1071	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1072	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1073	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1074	nzb_s_inner(j,i-1) ) + 1
1075	ENDIF
1076
1077	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1078	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1079	nzb_s_inner(j,i+1) ) + 1
1080	ENDIF
1081
1082	ENDIF
1083
1084	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1085	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1086	ENDIF
1087
1088	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1089	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1090	ENDIF
1091
1092	ENDDO
1093	ENDDO
1094
1095	!
1096	!-- Calculate wall flag arrays for the multigrid method
1097	IF ( psolver(1:9) == 'multigrid' ) THEN
1098	!
1099	!-- Gridpoint increment of the current level
1100	inc = 1
1101
1102	DO l = maximum_grid_level, 1 , -1
1103
1104	nxl_l = nxl_mg(l)
1105	nxr_l = nxr_mg(l)
1106	nys_l = nys_mg(l)
1107	nyn_l = nyn_mg(l)
1108	nzt_l = nzt_mg(l)
1109
1110	!
1111	!-- Assign the flag level to be calculated
1112	SELECT CASE ( l )
1113	CASE ( 1 )
1114	flags => wall_flags_1
1115	CASE ( 2 )
1116	flags => wall_flags_2
1117	CASE ( 3 )
1118	flags => wall_flags_3
1119	CASE ( 4 )
1120	flags => wall_flags_4
1121	CASE ( 5 )
1122	flags => wall_flags_5
1123	CASE ( 6 )
1124	flags => wall_flags_6
1125	CASE ( 7 )
1126	flags => wall_flags_7
1127	CASE ( 8 )
1128	flags => wall_flags_8
1129	CASE ( 9 )
1130	flags => wall_flags_9
1131	CASE ( 10 )
1132	flags => wall_flags_10
1133	END SELECT
1134
1135	!
1136	!-- Depending on the grid level, set the respective bits in case of
1137	!-- neighbouring walls
1138	!-- Bit 0: wall to the bottom
1139	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1140	!-- Bit 2: wall to the south
1141	!-- Bit 3: wall to the north
1142	!-- Bit 4: wall to the left
1143	!-- Bit 5: wall to the right
1144	!-- Bit 6: inside building
1145
1146	flags = 0
1147
1148	!
1149	!-- In case of masking method, flags are not set and multigrid method
1150	!-- works like FFT-solver
1151	IF ( .NOT. masking_method ) THEN
1152
1153	DO i = nxl_l-1, nxr_l+1
1154	DO j = nys_l-1, nyn_l+1
1155	DO k = nzb, nzt_l+1
1156
1157	!
1158	!-- Inside/outside building (inside building does not need
1159	!-- further tests for walls)
1160	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1161
1162	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1163
1164	ELSE
1165	!
1166	!-- Bottom wall
1167	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1168	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1169	ENDIF
1170	!
1171	!-- South wall
1172	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1173	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1174	ENDIF
1175	!
1176	!-- North wall
1177	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1178	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1179	ENDIF
1180	!
1181	!-- Left wall
1182	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1183	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1184	ENDIF
1185	!
1186	!-- Right wall
1187	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1188	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1189	ENDIF
1190
1191	ENDIF
1192
1193	ENDDO
1194	ENDDO
1195	ENDDO
1196
1197	ENDIF
1198
1199	!
1200	!-- Test output of flag arrays
1201	! i = nxl_l
1202	! WRITE (9,*) ' '
1203	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1204	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1205	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1206	! DO k = nzt_l+1, nzb, -1
1207	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1208	! ENDDO
1209
1210	inc = inc * 2
1211
1212	ENDDO
1213
1214	ENDIF
1215	!
1216	!-- Allocate flags needed for masking walls.
1217	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1218	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1219	wall_flags_0 = 0
1220	wall_flags_00 = 0
1221
1222	IF ( scalar_advec == 'ws-scheme' .OR. &
1223	scalar_advec == 'ws-scheme-mono' ) THEN
1224	!
1225	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1226	!-- near topography, inflow- and outflow boundaries as well as bottom and
1227	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1228	!-- grid points.
1229	DO i = nxl, nxr
1230	DO j = nys, nyn
1231	DO k = nzb_s_inner(j,i)+1, nzt
1232	!
1233	!-- scalar - x-direction
1234	!-- WS1 (0), WS3 (1), WS5 (2)
1235	IF ( k <= nzb_s_inner(j,i+1) .OR. &
1236	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1237	.AND. i == nxl ) .OR. &
1238	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1239	.AND. i == nxr ) ) &
1240	THEN
1241	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1242	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1243	.OR. &
1244	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1245	.AND. i == nxr-1 ) .OR. &
1246	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1247	.AND. i == nxlu ) ) &
1248	THEN
1249	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1250	ELSE
1251	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1252	ENDIF
1253	!
1254	!-- scalar - y-direction
1255	!-- WS1 (3), WS3 (4), WS5 (5)
1256	IF ( k <= nzb_s_inner(j+1,i) .OR. &
1257	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1258	.AND. j == nys ) .OR. &
1259	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1260	.AND. j == nyn ) ) &
1261	THEN
1262	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1263	!
1264	!-- WS3
1265	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1266	.OR. &
1267	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1268	.AND. j == nysv ) .OR. &
1269	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1270	.AND. j == nyn-1 ) ) &
1271	THEN
1272	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1273	!
1274	!-- WS5
1275	ELSE
1276	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1277	ENDIF
1278	!
1279	!-- scalar - z-direction
1280	!-- WS1 (6), WS3 (7), WS5 (8)
1281	flag_set = .FALSE.
1282	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1283	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1284	flag_set = .TRUE.
1285	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1286	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1287	flag_set = .TRUE.
1288	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1289	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1290	ENDIF
1291	ENDDO
1292	ENDDO
1293	ENDDO
1294	ENDIF
1295
1296	IF ( momentum_advec == 'ws-scheme' ) THEN
1297	!
1298	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1299	!-- near topography, inflow- and outflow boundaries as well as bottom and
1300	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1301	!-- grid points.
1302	DO i = nxl, nxr
1303	DO j = nys, nyn
1304	DO k = nzb+1, nzt
1305	!
1306	!-- At first, set flags to WS1.
1307	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1308	!-- in order to handle the left/south flux.
1309	!-- near vertical walls.
1310	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1311	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1312	!
1313	!-- u component - x-direction
1314	!-- WS1 (9), WS3 (10), WS5 (11)
1315	IF ( k <= nzb_u_inner(j,i+1) .OR. &
1316	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1317	.AND. i <= nxlu ) .OR. &
1318	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1319	.AND. i == nxr ) ) &
1320	THEN
1321	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1322	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1323	.OR. &
1324	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1325	.AND. i == nxr-1 ) .OR. &
1326	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1327	.AND. i == nxlu+1) ) &
1328	THEN
1329	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1330	!
1331	!-- Clear flag for WS1
1332	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1333	ELSE
1334	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1335	!
1336	!-- Clear flag for WS1
1337	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1338	ENDIF
1339	!
1340	!-- u component - y-direction
1341	!-- WS1 (12), WS3 (13), WS5 (14)
1342	IF ( k <= nzb_u_inner(j+1,i) .OR. &
1343	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1344	.AND. j == nys ) .OR. &
1345	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1346	.AND. j == nyn ) ) &
1347	THEN
1348	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1349	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1350	.OR. &
1351	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1352	.AND. j == nysv ) .OR. &
1353	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1354	.AND. j == nyn-1 ) ) &
1355	THEN
1356	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1357	!
1358	!-- Clear flag for WS1
1359	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1360	ELSE
1361	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1362	!
1363	!-- Clear flag for WS1
1364	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1365	ENDIF
1366	!
1367	!-- u component - z-direction
1368	!-- WS1 (15), WS3 (16), WS5 (17)
1369	flag_set = .FALSE.
1370	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1371	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1372	flag_set = .TRUE.
1373	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1374	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1375	flag_set = .TRUE.
1376	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1377	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1378	ENDIF
1379
1380	ENDDO
1381	ENDDO
1382	ENDDO
1383
1384	DO i = nxl, nxr
1385	DO j = nys, nyn
1386	DO k = nzb+1, nzt
1387	!
1388	!-- At first, set flags to WS1.
1389	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1390	!-- in order to handle the left/south flux.
1391	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1392	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1393	!
1394	!-- v component - x-direction
1395	!-- WS1 (18), WS3 (19), WS5 (20)
1396	IF ( k <= nzb_v_inner(j,i+1) .OR. &
1397	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1398	.AND. i == nxl ) .OR. &
1399	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1400	.AND. i == nxr ) ) &
1401	THEN
1402	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1403	!
1404	!-- WS3
1405	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1406	.OR. &
1407	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1408	.AND. i == nxr-1 ) .OR. &
1409	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1410	.AND. i == nxlu ) ) &
1411	THEN
1412	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1413	!
1414	!-- Clear flag for WS1
1415	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1416	ELSE
1417	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1418	!
1419	!-- Clear flag for WS1
1420	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1421	ENDIF
1422	!
1423	!-- v component - y-direction
1424	!-- WS1 (21), WS3 (22), WS5 (23)
1425	IF ( k <= nzb_v_inner(j+1,i) .OR. &
1426	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1427	.AND. j <= nysv ) .OR. &
1428	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1429	.AND. j == nyn ) ) &
1430	THEN
1431	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1432	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1433	.OR. &
1434	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1435	.AND. j == nysv+1) .OR. &
1436	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1437	.AND. j == nyn-1 ) ) &
1438	THEN
1439	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1440	!
1441	!-- Clear flag for WS1
1442	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1443	ELSE
1444	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1445	!
1446	!-- Clear flag for WS1
1447	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1448	ENDIF
1449	!
1450	!-- v component - z-direction
1451	!-- WS1 (24), WS3 (25), WS5 (26)
1452	flag_set = .FALSE.
1453	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1454	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1455	flag_set = .TRUE.
1456	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1457	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1458	flag_set = .TRUE.
1459	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1460	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1461	ENDIF
1462
1463	ENDDO
1464	ENDDO
1465	ENDDO
1466	DO i = nxl, nxr
1467	DO j = nys, nyn
1468	DO k = nzb+1, nzt
1469	!
1470	!-- At first, set flags to WS1.
1471	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1472	!-- in order to handle the left/south flux.
1473	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1474	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1475	!
1476	!-- w component - x-direction
1477	!-- WS1 (27), WS3 (28), WS5 (29)
1478	IF ( k <= nzb_w_inner(j,i+1) .OR. &
1479	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1480	.AND. i == nxl ) .OR. &
1481	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1482	.AND. i == nxr ) ) &
1483	THEN
1484	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1485	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1486	.OR. &
1487	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1488	.AND. i == nxr-1 ) .OR. &
1489	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1490	.AND. i == nxlu ) ) &
1491	THEN
1492	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1493	!
1494	!-- Clear flag for WS1
1495	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1496	ELSE
1497	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1498	!
1499	!-- Clear flag for WS1
1500	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1501	ENDIF
1502	!
1503	!-- w component - y-direction
1504	!-- WS1 (30), WS3 (31), WS5 (32)
1505	IF ( k <= nzb_w_inner(j+1,i) .OR. &
1506	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1507	.AND. j == nys ) .OR. &
1508	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1509	.AND. j == nyn ) ) &
1510	THEN
1511	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1512	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1513	.OR. &
1514	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1515	.AND. j == nysv ) .OR. &
1516	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1517	.AND. j == nyn-1 ) ) &
1518	THEN
1519	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1520	!
1521	!-- Clear flag for WS1
1522	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1523	ELSE
1524	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1525	!
1526	!-- Clear flag for WS1
1527	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1528	ENDIF
1529	!
1530	!-- w component - z-direction
1531	!-- WS1 (33), WS3 (34), WS5 (35)
1532	flag_set = .FALSE.
1533	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1534	.OR. k == nzt ) THEN
1535	!
1536	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1537	!-- set, although this is not a prognostic level. However,
1538	!-- contrary to the advection of u,v and s this is necessary
1539	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1540	!-- at k == nzb_w_inner(j,i)+1.
1541	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1542	flag_set = .TRUE.
1543	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1544	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1545	flag_set = .TRUE.
1546	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1547	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1548	ENDIF
1549
1550	ENDDO
1551	ENDDO
1552	ENDDO
1553
1554	ENDIF
1555
1556	!
1557	!-- Exchange 3D integer wall_flags.
1558	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1559	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1560	!
1561	!-- Exchange ghost points for advection flags
1562	CALL exchange_horiz_int( wall_flags_0, nbgp )
1563	CALL exchange_horiz_int( wall_flags_00, nbgp )
1564	!
1565	!-- Set boundary flags at inflow and outflow boundary in case of
1566	!-- non-cyclic boundary conditions.
1567	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1568	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1569	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1570	ENDIF
1571
1572	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
1573	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1574	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1575	ENDIF
1576
1577	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
1578	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1579	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1580	ENDIF
1581
1582	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1583	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1584	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1585	ENDIF
1586
1587	ENDIF
1588
1589	!
1590	!-- In case of topography: limit near-wall mixing length l_wall further:
1591	!-- Go through all points of the subdomain one by one and look for the closest
1592	!-- surface
1593	IF ( TRIM(topography) /= 'flat' ) THEN
1594	DO i = nxl, nxr
1595	DO j = nys, nyn
1596
1597	nzb_si = nzb_s_inner(j,i)
1598	vi = vertical_influence(nzb_si)
1599
1600	IF ( wall_n(j,i) > 0 ) THEN
1601	!
1602	!-- North wall (y distance)
1603	DO k = wall_n(j,i), nzb_si
1604	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1605	ENDDO
1606	!
1607	!-- Above North wall (yz distance)
1608	DO k = nzb_si + 1, nzb_si + vi
1609	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1610	SQRT( 0.25_wp * dy**2 + &
1611	( zu(k) - zw(nzb_si) )**2 ) )
1612	ENDDO
1613	!
1614	!-- Northleft corner (xy distance)
1615	IF ( corner_nl(j,i) > 0 ) THEN
1616	DO k = corner_nl(j,i), nzb_si
1617	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1618	0.5_wp * SQRT( dx2 + dy2 ) )
1619	ENDDO
1620	!
1621	!-- Above Northleft corner (xyz distance)
1622	DO k = nzb_si + 1, nzb_si + vi
1623	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1624	SQRT( 0.25_wp * (dx2 + dy2) + &
1625	( zu(k) - zw(nzb_si) )**2 ) )
1626	ENDDO
1627	ENDIF
1628	!
1629	!-- Northright corner (xy distance)
1630	IF ( corner_nr(j,i) > 0 ) THEN
1631	DO k = corner_nr(j,i), nzb_si
1632	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1633	0.5_wp * SQRT( dx2 + dy2 ) )
1634	ENDDO
1635	!
1636	!-- Above northright corner (xyz distance)
1637	DO k = nzb_si + 1, nzb_si + vi
1638	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1639	SQRT( 0.25_wp * (dx2 + dy2) + &
1640	( zu(k) - zw(nzb_si) )**2 ) )
1641	ENDDO
1642	ENDIF
1643	ENDIF
1644
1645	IF ( wall_s(j,i) > 0 ) THEN
1646	!
1647	!-- South wall (y distance)
1648	DO k = wall_s(j,i), nzb_si
1649	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1650	ENDDO
1651	!
1652	!-- Above south wall (yz distance)
1653	DO k = nzb_si + 1, nzb_si + vi
1654	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1655	SQRT( 0.25_wp * dy**2 + &
1656	( zu(k) - zw(nzb_si) )**2 ) )
1657	ENDDO
1658	!
1659	!-- Southleft corner (xy distance)
1660	IF ( corner_sl(j,i) > 0 ) THEN
1661	DO k = corner_sl(j,i), nzb_si
1662	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1663	0.5_wp * SQRT( dx2 + dy2 ) )
1664	ENDDO
1665	!
1666	!-- Above southleft corner (xyz distance)
1667	DO k = nzb_si + 1, nzb_si + vi
1668	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1669	SQRT( 0.25_wp * (dx2 + dy2) + &
1670	( zu(k) - zw(nzb_si) )**2 ) )
1671	ENDDO
1672	ENDIF
1673	!
1674	!-- Southright corner (xy distance)
1675	IF ( corner_sr(j,i) > 0 ) THEN
1676	DO k = corner_sr(j,i), nzb_si
1677	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1678	0.5_wp * SQRT( dx2 + dy2 ) )
1679	ENDDO
1680	!
1681	!-- Above southright corner (xyz distance)
1682	DO k = nzb_si + 1, nzb_si + vi
1683	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1684	SQRT( 0.25_wp * (dx2 + dy2) + &
1685	( zu(k) - zw(nzb_si) )**2 ) )
1686	ENDDO
1687	ENDIF
1688
1689	ENDIF
1690
1691	IF ( wall_l(j,i) > 0 ) THEN
1692	!
1693	!-- Left wall (x distance)
1694	DO k = wall_l(j,i), nzb_si
1695	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1696	ENDDO
1697	!
1698	!-- Above left wall (xz distance)
1699	DO k = nzb_si + 1, nzb_si + vi
1700	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1701	SQRT( 0.25_wp * dx**2 + &
1702	( zu(k) - zw(nzb_si) )**2 ) )
1703	ENDDO
1704	ENDIF
1705
1706	IF ( wall_r(j,i) > 0 ) THEN
1707	!
1708	!-- Right wall (x distance)
1709	DO k = wall_r(j,i), nzb_si
1710	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1711	ENDDO
1712	!
1713	!-- Above right wall (xz distance)
1714	DO k = nzb_si + 1, nzb_si + vi
1715	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1716	SQRT( 0.25_wp * dx**2 + &
1717	( zu(k) - zw(nzb_si) )**2 ) )
1718	ENDDO
1719
1720	ENDIF
1721
1722	ENDDO
1723	ENDDO
1724
1725	ENDIF
1726
1727	!
1728	!-- Multiplication with wall_adjustment_factor
1729	l_wall = wall_adjustment_factor * l_wall
1730
1731	!
1732	!-- Set lateral boundary conditions for l_wall
1733	CALL exchange_horiz( l_wall, nbgp )
1734
1735	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1736	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1737
1738	#endif
1739
1740	END SUBROUTINE init_grid

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