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source: palm/trunk/SOURCE/init_grid.f90 @ 1746

Last change on this file since 1746 was 1744, 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 1744 2016-01-13 10:29:35Z gronemeier $
26	!
27	! 1743 2016-01-13 10:23:51Z raasch
28	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
29	! total domain
30	!
31	! 1691 2015-10-26 16:17:44Z maronga
32	! Renamed prandtl_layer to constant_flux_layer.
33	!
34	! 1682 2015-10-07 23:56:08Z knoop
35	! Code annotations made doxygen readable
36	!
37	! 1677 2015-10-02 13:25:23Z boeske
38	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
39	!
40	! 1675 2015-10-02 08:28:59Z gronemeier
41	! Bugfix: Definition of topography grid levels
42	!
43	! 1660 2015-09-21 08:15:16Z gronemeier
44	! Bugfix: Definition of topography grid levels if vertical grid stretching
45	! starts below the maximum topography height.
46	!
47	! 1580 2015-04-10 13:43:49Z suehring
48	! Bugfix: setting flags for 5th order scheme near buildings
49	!
50	! 1575 2015-03-27 09:56:27Z raasch
51	! adjustments for psolver-queries
52	!
53	! 1557 2015-03-05 16:43:04Z suehring
54	! Adjustment for monotoinic limiter
55	!
56	! 1418 2014-06-06 13:05:08Z fricke
57	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
58	! condition and a negative value for dz_stretch_level the condition
59	! was always true for the whole model domain
60	!
61	! 1409 2014-05-23 12:11:32Z suehring
62	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
63	! j <= nysv
64	!
65	! 1353 2014-04-08 15:21:23Z heinze
66	! REAL constants provided with KIND-attribute
67	!
68	! 1322 2014-03-20 16:38:49Z raasch
69	! REAL constants defined as wp-kind
70	!
71	! 1320 2014-03-20 08:40:49Z raasch
72	! ONLY-attribute added to USE-statements,
73	! kind-parameters added to all INTEGER and REAL declaration statements,
74	! kinds are defined in new module kinds,
75	! revision history before 2012 removed,
76	! comment fields (!:) to be used for variable explanations added to
77	! all variable declaration statements
78	!
79	! 1221 2013-09-10 08:59:13Z raasch
80	! wall_flags_00 introduced to hold bits 32-63,
81	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
82	! loops optimized for openACC (pres + flow_statistics)
83	!
84	! 1092 2013-02-02 11:24:22Z raasch
85	! unused variables removed
86	!
87	! 1069 2012-11-28 16:18:43Z maronga
88	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
89	! model in case of coupled runs
90	!
91	! 1036 2012-10-22 13:43:42Z raasch
92	! code put under GPL (PALM 3.9)
93	!
94	! 1015 2012-09-27 09:23:24Z raasch
95	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
96	! nzb_w_inner+1
97	!
98	! 996 2012-09-07 10:41:47Z raasch
99	! little reformatting
100	!
101	! 978 2012-08-09 08:28:32Z fricke
102	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
103	! Bugfix: Set wall_flags_0 for inflow boundary
104	!
105	! 927 2012-06-06 19:15:04Z raasch
106	! Wall flags are not set for multigrid method in case of masking method
107	!
108	! 864 2012-03-27 15:10:33Z gryschka
109	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
110	! were not correctly defined for k=1.
111	!
112	! 861 2012-03-26 14:18:34Z suehring
113	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
114	! inflow and outflow boundaries as well as near the bottom and the top of the
115	! model domain.!
116	! Initialization of nzb_s_inner and nzb_w_inner.
117	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
118	! while setting wall_flags_0
119	!
120	! 843 2012-02-29 15:16:21Z gryschka
121	! In case of ocean and dirichlet bc for u and v at the bottom
122	! the first u-level ist defined at same height as the first w-level
123	!
124	! 818 2012-02-08 16:11:23Z maronga
125	! Bugfix: topo_height is only required if topography is used. It is thus now
126	! allocated in the topography branch
127	!
128	! 809 2012-01-30 13:32:58Z maronga
129	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
130	!
131	! 807 2012-01-25 11:53:51Z maronga
132	! New cpp directive "__check" implemented which is used by check_namelist_files
133	!
134	! Revision 1.1 1997/08/11 06:17:45 raasch
135	! Initial revision (Testversion)
136	!
137	!
138	! Description:
139	! ------------
140	!> Creating grid depending constants
141	!------------------------------------------------------------------------------!
142	SUBROUTINE init_grid
143
144
145	USE arrays_3d, &
146	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
147	f2_mg, f3_mg, l_grid, l_wall, zu, zw
148
149	USE control_parameters, &
150	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
151	building_length_y, building_wall_left, building_wall_south, &
152	canyon_height, canyon_wall_left, canyon_wall_south, &
153	canyon_width_x, canyon_width_y, constant_flux_layer, &
154	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
155	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
156	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
157	masking_method, maximum_grid_level, message_string, &
158	momentum_advec, ocean, outflow_l, outflow_n, outflow_r, &
159	outflow_s, psolver, scalar_advec, topography, &
160	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
161	wall_adjustment_factor
162
163	USE grid_variables, &
164	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
165	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
166	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
167
168	USE indices, &
169	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
170	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
171	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
172	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
173	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
174	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
175	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
176	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
177	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
178	wall_flags_9
179
180	USE kinds
181
182	USE pegrid
183
184	IMPLICIT NONE
185
186	INTEGER(iwp) :: bh !<
187	INTEGER(iwp) :: blx !<
188	INTEGER(iwp) :: bly !<
189	INTEGER(iwp) :: bxl !<
190	INTEGER(iwp) :: bxr !<
191	INTEGER(iwp) :: byn !<
192	INTEGER(iwp) :: bys !<
193	INTEGER(iwp) :: ch !<
194	INTEGER(iwp) :: cwx !<
195	INTEGER(iwp) :: cwy !<
196	INTEGER(iwp) :: cxl !<
197	INTEGER(iwp) :: cxr !<
198	INTEGER(iwp) :: cyn !<
199	INTEGER(iwp) :: cys !<
200	INTEGER(iwp) :: gls !<
201	INTEGER(iwp) :: i !<
202	INTEGER(iwp) :: ii !<
203	INTEGER(iwp) :: inc !<
204	INTEGER(iwp) :: j !<
205	INTEGER(iwp) :: k !<
206	INTEGER(iwp) :: l !<
207	INTEGER(iwp) :: nxl_l !<
208	INTEGER(iwp) :: nxr_l !<
209	INTEGER(iwp) :: nyn_l !<
210	INTEGER(iwp) :: nys_l !<
211	INTEGER(iwp) :: nzb_si !<
212	INTEGER(iwp) :: nzt_l !<
213	INTEGER(iwp) :: vi !<
214
215	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
216
217	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
218	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
219	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
220	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
221	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
222	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
223	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
224	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
225	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
226	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
227
228	LOGICAL :: flag_set = .FALSE. !<
229
230	REAL(wp) :: dx_l !<
231	REAL(wp) :: dy_l !<
232	REAL(wp) :: dz_stretched !<
233
234	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
235
236
237	!
238	!-- Calculation of horizontal array bounds including ghost layers
239	nxlg = nxl - nbgp
240	nxrg = nxr + nbgp
241	nysg = nys - nbgp
242	nyng = nyn + nbgp
243
244	!
245	!-- Allocate grid arrays
246	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
247	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
248
249	!
250	!-- Compute height of u-levels from constant grid length and dz stretch factors
251	IF ( dz == -1.0_wp ) THEN
252	message_string = 'missing dz'
253	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
254	ELSEIF ( dz <= 0.0_wp ) THEN
255	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
256	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
257	ENDIF
258
259	!
260	!-- Define the vertical grid levels
261	IF ( .NOT. ocean ) THEN
262	!
263	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
264	!-- The second u-level (k=1) corresponds to the top of the
265	!-- Prandtl-layer.
266
267	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
268	zu(0) = 0.0_wp
269	! zu(0) = - dz * 0.5_wp
270	ELSE
271	zu(0) = - dz * 0.5_wp
272	ENDIF
273	zu(1) = dz * 0.5_wp
274
275	dz_stretch_level_index = nzt+1
276	dz_stretched = dz
277	DO k = 2, nzt+1
278	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
279	dz_stretched = dz_stretched * dz_stretch_factor
280	dz_stretched = MIN( dz_stretched, dz_max )
281	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
282	ENDIF
283	zu(k) = zu(k-1) + dz_stretched
284	ENDDO
285
286	!
287	!-- Compute the w-levels. They are always staggered half-way between the
288	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
289	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
290	!-- The top w-level is extrapolated linearly.
291	zw(0) = 0.0_wp
292	DO k = 1, nzt
293	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
294	ENDDO
295	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
296
297	ELSE
298	!
299	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
300	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
301	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
302	!-- w-level are defined at same height, but staggered from the second level.
303	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
304	zu(nzt+1) = dz * 0.5_wp
305	zu(nzt) = - dz * 0.5_wp
306
307	dz_stretch_level_index = 0
308	dz_stretched = dz
309	DO k = nzt-1, 0, -1
310	!
311	!-- The default value of dz_stretch_level is positive, thus the first
312	!-- condition is always true. Hence, the second condition is necessary.
313	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
314	.AND. dz_stretched < dz_max ) THEN
315	dz_stretched = dz_stretched * dz_stretch_factor
316	dz_stretched = MIN( dz_stretched, dz_max )
317	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
318	ENDIF
319	zu(k) = zu(k+1) - dz_stretched
320	ENDDO
321
322	!
323	!-- Compute the w-levels. They are always staggered half-way between the
324	!-- corresponding u-levels, except in case of dirichlet bc for u and v
325	!-- at the ground. In this case the first u- and w-level are defined at
326	!-- same height. The top w-level (nzt+1) is not used but set for
327	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
328	zw(nzt+1) = dz
329	zw(nzt) = 0.0_wp
330	DO k = 0, nzt
331	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
332	ENDDO
333
334	!
335	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
336	!-- at same height.
337	IF ( ibc_uv_b == 0 ) THEN
338	zu(0) = zw(0)
339	ENDIF
340
341	ENDIF
342
343	!
344	!-- Compute grid lengths.
345	DO k = 1, nzt+1
346	dzu(k) = zu(k) - zu(k-1)
347	ddzu(k) = 1.0_wp / dzu(k)
348	dzw(k) = zw(k) - zw(k-1)
349	ddzw(k) = 1.0_wp / dzw(k)
350	ENDDO
351
352	DO k = 1, nzt
353	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
354	ENDDO
355
356	!
357	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
358	!-- everywhere. For the actual grid, the grid spacing at the lowest level
359	!-- is only dz/2, but should be dz. Therefore, an additional array
360	!-- containing with appropriate grid information is created for these
361	!-- solvers.
362	IF ( psolver(1:9) /= 'multigrid' ) THEN
363	ALLOCATE( ddzu_pres(1:nzt+1) )
364	ddzu_pres = ddzu
365	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
366	ENDIF
367
368	!
369	!-- In case of multigrid method, compute grid lengths and grid factors for the
370	!-- grid levels
371	IF ( psolver(1:9) == 'multigrid' ) THEN
372
373	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
374	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
375	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
376	f1_mg(nzb+1:nzt,maximum_grid_level), &
377	f2_mg(nzb+1:nzt,maximum_grid_level), &
378	f3_mg(nzb+1:nzt,maximum_grid_level) )
379
380	dzu_mg(:,maximum_grid_level) = dzu
381	!
382	!-- Next line to ensure an equally spaced grid.
383	dzu_mg(1,maximum_grid_level) = dzu(2)
384
385	dzw_mg(:,maximum_grid_level) = dzw
386	nzt_l = nzt
387	DO l = maximum_grid_level-1, 1, -1
388	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
389	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
390	nzt_l = nzt_l / 2
391	DO k = 2, nzt_l+1
392	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
393	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
394	ENDDO
395	ENDDO
396
397	nzt_l = nzt
398	dx_l = dx
399	dy_l = dy
400	DO l = maximum_grid_level, 1, -1
401	ddx2_mg(l) = 1.0_wp / dx_l**2
402	ddy2_mg(l) = 1.0_wp / dy_l**2
403	DO k = nzb+1, nzt_l
404	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
405	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
406	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
407	f2_mg(k,l) + f3_mg(k,l)
408	ENDDO
409	nzt_l = nzt_l / 2
410	dx_l = dx_l * 2.0_wp
411	dy_l = dy_l * 2.0_wp
412	ENDDO
413
414	ENDIF
415
416	!
417	!-- Compute the reciprocal values of the horizontal grid lengths.
418	ddx = 1.0_wp / dx
419	ddy = 1.0_wp / dy
420	dx2 = dx * dx
421	dy2 = dy * dy
422	ddx2 = 1.0_wp / dx2
423	ddy2 = 1.0_wp / dy2
424
425	!
426	!-- Compute the grid-dependent mixing length.
427	DO k = 1, nzt
428	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
429	ENDDO
430
431	!
432	!-- Allocate outer and inner index arrays for topography and set
433	!-- defaults.
434	!-- nzb_local has to contain additional layers of ghost points for calculating
435	!-- the flag arrays needed for the multigrid method
436	gls = 2**( maximum_grid_level )
437	IF ( gls < nbgp ) gls = nbgp
438
439	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
440	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
441	nzb_local(-gls:ny+gls,-gls:nx+gls), &
442	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
443	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
444	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
445	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
446	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
447	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
448	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
449	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
450	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
451	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
452	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
453	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
454	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
455	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
456	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
457	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
458	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
459	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
460	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
461	nzb_2d(nysg:nyng,nxlg:nxrg), &
462	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
463	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
464	wall_e_x(nysg:nyng,nxlg:nxrg), &
465	wall_e_y(nysg:nyng,nxlg:nxrg), &
466	wall_u(nysg:nyng,nxlg:nxrg), &
467	wall_v(nysg:nyng,nxlg:nxrg), &
468	wall_w_x(nysg:nyng,nxlg:nxrg), &
469	wall_w_y(nysg:nyng,nxlg:nxrg) )
470
471
472
473	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
474
475
476	nzb_s_inner = nzb; nzb_s_outer = nzb
477	nzb_u_inner = nzb; nzb_u_outer = nzb
478	nzb_v_inner = nzb; nzb_v_outer = nzb
479	nzb_w_inner = nzb; nzb_w_outer = nzb
480
481	rflags_s_inner = 1.0_wp
482	rflags_invers = 1.0_wp
483
484	!
485	!-- Define vertical gridpoint from (or to) which on the usual finite difference
486	!-- form (which does not use surface fluxes) is applied
487	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
488	nzb_diff = nzb + 2
489	ELSE
490	nzb_diff = nzb + 1
491	ENDIF
492	IF ( use_top_fluxes ) THEN
493	nzt_diff = nzt - 1
494	ELSE
495	nzt_diff = nzt
496	ENDIF
497
498	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
499	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
500
501	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
502	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
503	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
504	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
505
506	!
507	!-- Initialize near-wall mixing length l_wall only in the vertical direction
508	!-- for the moment,
509	!-- multiplication with wall_adjustment_factor near the end of this routine
510	l_wall(nzb,:,:) = l_grid(1)
511	DO k = nzb+1, nzt
512	l_wall(k,:,:) = l_grid(k)
513	ENDDO
514	l_wall(nzt+1,:,:) = l_grid(nzt)
515
516	ALLOCATE ( vertical_influence(nzb:nzt) )
517	DO k = 1, nzt
518	vertical_influence(k) = MIN ( INT( l_grid(k) / &
519	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
520	ENDDO
521
522	DO k = 1, MAXVAL( nzb_s_inner )
523	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
524	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
525	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
526	'threshold given by only local', &
527	' &horizontal reduction of near_wall ', &
528	'mixing length l_wall', &
529	' &starting from height level k = ', k, '.'
530	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
531	EXIT
532	ENDIF
533	ENDDO
534	vertical_influence(0) = vertical_influence(1)
535
536	DO i = nxlg, nxrg
537	DO j = nysg, nyng
538	DO k = nzb_s_inner(j,i) + 1, &
539	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
540	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
541	ENDDO
542	ENDDO
543	ENDDO
544
545	!
546	!-- Set outer and inner index arrays for non-flat topography.
547	!-- Here consistency checks concerning domain size and periodicity are
548	!-- necessary.
549	!-- Within this SELECT CASE structure only nzb_local is initialized
550	!-- individually depending on the chosen topography type, all other index
551	!-- arrays are initialized further below.
552	SELECT CASE ( TRIM( topography ) )
553
554	CASE ( 'flat' )
555	!
556	!-- nzb_local is required for the multigrid solver
557	nzb_local = 0
558
559	CASE ( 'single_building' )
560	!
561	!-- Single rectangular building, by default centered in the middle of the
562	!-- total domain
563	blx = NINT( building_length_x / dx )
564	bly = NINT( building_length_y / dy )
565	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
566	IF ( ABS( zw(bh ) - building_height ) == &
567	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
568
569	IF ( building_wall_left == 9999999.9_wp ) THEN
570	building_wall_left = ( nx + 1 - blx ) / 2 * dx
571	ENDIF
572	bxl = NINT( building_wall_left / dx )
573	bxr = bxl + blx
574
575	IF ( building_wall_south == 9999999.9_wp ) THEN
576	building_wall_south = ( ny + 1 - bly ) / 2 * dy
577	ENDIF
578	bys = NINT( building_wall_south / dy )
579	byn = bys + bly
580
581	!
582	!-- Building size has to meet some requirements
583	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
584	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
585	WRITE( message_string, * ) 'inconsistent building parameters:', &
586	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
587	'byn=', byn, 'nx=', nx, 'ny=', ny
588	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
589	ENDIF
590
591	!
592	!-- Define the building.
593	nzb_local = 0
594	nzb_local(bys:byn,bxl:bxr) = bh
595
596	CASE ( 'single_street_canyon' )
597	!
598	!-- Single quasi-2D street canyon of infinite length in x or y direction.
599	!-- The canyon is centered in the other direction by default.
600	IF ( canyon_width_x /= 9999999.9_wp ) THEN
601	!
602	!-- Street canyon in y direction
603	cwx = NINT( canyon_width_x / dx )
604	IF ( canyon_wall_left == 9999999.9_wp ) THEN
605	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
606	ENDIF
607	cxl = NINT( canyon_wall_left / dx )
608	cxr = cxl + cwx
609
610	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
611	!
612	!-- Street canyon in x direction
613	cwy = NINT( canyon_width_y / dy )
614	IF ( canyon_wall_south == 9999999.9_wp ) THEN
615	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
616	ENDIF
617	cys = NINT( canyon_wall_south / dy )
618	cyn = cys + cwy
619
620	ELSE
621
622	message_string = 'no street canyon width given'
623	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
624
625	ENDIF
626
627	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
628	IF ( ABS( zw(ch ) - canyon_height ) == &
629	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
630
631	dp_level_ind_b = ch
632	!
633	!-- Street canyon size has to meet some requirements
634	IF ( canyon_width_x /= 9999999.9_wp ) THEN
635	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
636	( ch < 3 ) ) THEN
637	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
638	'&cxl=', cxl, 'cxr=', cxr, &
639	'cwx=', cwx, &
640	'ch=', ch, 'nx=', nx, 'ny=', ny
641	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
642	ENDIF
643	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
644	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
645	( ch < 3 ) ) THEN
646	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
647	'&cys=', cys, 'cyn=', cyn, &
648	'cwy=', cwy, &
649	'ch=', ch, 'nx=', nx, 'ny=', ny
650	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
651	ENDIF
652	ENDIF
653	IF ( canyon_width_x /= 9999999.9_wp .AND. &
654	canyon_width_y /= 9999999.9_wp ) THEN
655	message_string = 'inconsistent canyon parameters:' // &
656	'&street canyon can only be oriented' // &
657	'&either in x- or in y-direction'
658	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
659	ENDIF
660
661	nzb_local = ch
662	IF ( canyon_width_x /= 9999999.9_wp ) THEN
663	nzb_local(:,cxl+1:cxr-1) = 0
664	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
665	nzb_local(cys+1:cyn-1,:) = 0
666	ENDIF
667
668	CASE ( 'read_from_file' )
669
670	ALLOCATE ( topo_height(0:ny,0:nx) )
671
672	DO ii = 0, io_blocks-1
673	IF ( ii == io_group ) THEN
674
675	!
676	!-- Arbitrary irregular topography data in PALM format (exactly
677	!-- matching the grid size and total domain size)
678	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
679	FORM='FORMATTED', ERR=10 )
680	DO j = ny, 0, -1
681	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
682	ENDDO
683
684	GOTO 12
685
686	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
687	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
688
689	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
690	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
691
692	12 CLOSE( 90 )
693
694	ENDIF
695	#if defined( __parallel ) && ! defined ( __check )
696	CALL MPI_BARRIER( comm2d, ierr )
697	#endif
698	ENDDO
699
700	!
701	!-- Calculate the index height of the topography
702	DO i = 0, nx
703	DO j = 0, ny
704	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
705	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
706	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
707	nzb_local(j,i) = nzb_local(j,i) + 1
708	ENDDO
709	ENDDO
710
711	DEALLOCATE ( topo_height )
712	!
713	!-- Add cyclic boundaries (additional layers are for calculating
714	!-- flag arrays needed for the multigrid sover)
715	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
716	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
717	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
718	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
719
720	CASE DEFAULT
721	!
722	!-- The DEFAULT case is reached either if the parameter topography
723	!-- contains a wrong character string or if the user has defined a special
724	!-- case in the user interface. There, the subroutine user_init_grid
725	!-- checks which of these two conditions applies.
726	CALL user_init_grid( gls, nzb_local )
727
728	END SELECT
729	!
730	!-- Determine the maximum level of topography. Furthermore it is used for
731	!-- steering the degradation of order of the applied advection scheme.
732	!-- In case of non-cyclic lateral boundaries, the order of the advection
733	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
734	nzb_max = MAXVAL( nzb_local ) + 1
735	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
736	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
737	nzb_max = nzt
738	ENDIF
739
740	!
741	!-- Consistency checks and index array initialization are only required for
742	!-- non-flat topography, also the initialization of topography height arrays
743	!-- zu_s_inner and zw_w_inner
744	IF ( TRIM( topography ) /= 'flat' ) THEN
745
746	!
747	!-- Consistency checks
748	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
749	WRITE( message_string, * ) 'nzb_local values are outside the', &
750	'model domain', &
751	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
752	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
753	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
754	ENDIF
755
756	IF ( bc_lr == 'cyclic' ) THEN
757	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
758	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
759	message_string = 'nzb_local does not fulfill cyclic' // &
760	' boundary condition in x-direction'
761	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
762	ENDIF
763	ENDIF
764	IF ( bc_ns == 'cyclic' ) THEN
765	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
766	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
767	message_string = 'nzb_local does not fulfill cyclic' // &
768	' boundary condition in y-direction'
769	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
770	ENDIF
771	ENDIF
772
773	IF ( topography_grid_convention == 'cell_edge' ) THEN
774	!
775	!-- The array nzb_local as defined using the 'cell_edge' convention
776	!-- describes the actual total size of topography which is defined at the
777	!-- cell edges where u=0 on the topography walls in x-direction and v=0
778	!-- on the topography walls in y-direction. However, PALM uses individual
779	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
780	!-- Therefore, the extent of topography in nzb_local is now reduced by
781	!-- 1dx at the E topography walls and by 1dy at the N topography walls
782	!-- to form the basis for nzb_s_inner.
783	DO j = -gls, ny + gls
784	DO i = -gls, nx
785	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
786	ENDDO
787	ENDDO
788	!-- apply cyclic boundary conditions in x-direction
789	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
790	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
791	DO i = -gls, nx + gls
792	DO j = -gls, ny
793	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
794	ENDDO
795	ENDDO
796	!-- apply cyclic boundary conditions in y-direction
797	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
798	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
799	ENDIF
800
801	!
802	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
803	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
804	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
805
806	!
807	!-- Initialize remaining index arrays:
808	!-- first pre-initialize them with nzb_s_inner...
809	nzb_u_inner = nzb_s_inner
810	nzb_u_outer = nzb_s_inner
811	nzb_v_inner = nzb_s_inner
812	nzb_v_outer = nzb_s_inner
813	nzb_w_outer = nzb_s_inner
814	nzb_s_outer = nzb_s_inner
815
816	!
817	!-- ...then extend pre-initialized arrays in their according directions
818	!-- based on nzb_local using nzb_tmp as a temporary global index array
819
820	!
821	!-- nzb_s_outer:
822	!-- extend nzb_local east-/westwards first, then north-/southwards
823	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
824	DO j = -1, ny + 1
825	DO i = 0, nx
826	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
827	nzb_local(j,i+1) )
828	ENDDO
829	ENDDO
830	DO i = nxl, nxr
831	DO j = nys, nyn
832	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
833	nzb_tmp(j+1,i) )
834	ENDDO
835	!
836	!-- non-cyclic boundary conditions (overwritten by call of
837	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
838	IF ( nys == 0 ) THEN
839	j = -1
840	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
841	ENDIF
842	IF ( nyn == ny ) THEN
843	j = ny + 1
844	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
845	ENDIF
846	ENDDO
847	!
848	!-- nzb_w_outer:
849	!-- identical to nzb_s_outer
850	nzb_w_outer = nzb_s_outer
851
852	!
853	!-- nzb_u_inner:
854	!-- extend nzb_local rightwards only
855	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
856	DO j = -1, ny + 1
857	DO i = 0, nx + 1
858	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
859	ENDDO
860	ENDDO
861	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
862
863	!
864	!-- nzb_u_outer:
865	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
866	DO i = nxl, nxr
867	DO j = nys, nyn
868	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
869	nzb_tmp(j+1,i) )
870	ENDDO
871	!
872	!-- non-cyclic boundary conditions (overwritten by call of
873	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
874	IF ( nys == 0 ) THEN
875	j = -1
876	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
877	ENDIF
878	IF ( nyn == ny ) THEN
879	j = ny + 1
880	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
881	ENDIF
882	ENDDO
883
884	!
885	!-- nzb_v_inner:
886	!-- extend nzb_local northwards only
887	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
888	DO i = -1, nx + 1
889	DO j = 0, ny + 1
890	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
891	ENDDO
892	ENDDO
893	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
894
895	!
896	!-- nzb_v_outer:
897	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
898	DO j = nys, nyn
899	DO i = nxl, nxr
900	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
901	nzb_tmp(j,i+1) )
902	ENDDO
903	!
904	!-- non-cyclic boundary conditions (overwritten by call of
905	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
906	IF ( nxl == 0 ) THEN
907	i = -1
908	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
909	ENDIF
910	IF ( nxr == nx ) THEN
911	i = nx + 1
912	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
913	ENDIF
914	ENDDO
915	#if ! defined ( __check )
916	!
917	!-- Exchange of lateral boundary values (parallel computers) and cyclic
918	!-- boundary conditions, if applicable.
919	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
920	!-- they do not require exchange and are not included here.
921	CALL exchange_horiz_2d_int( nzb_u_inner )
922	CALL exchange_horiz_2d_int( nzb_u_outer )
923	CALL exchange_horiz_2d_int( nzb_v_inner )
924	CALL exchange_horiz_2d_int( nzb_v_outer )
925	CALL exchange_horiz_2d_int( nzb_w_outer )
926	CALL exchange_horiz_2d_int( nzb_s_outer )
927
928	!
929	!-- Allocate and set the arrays containing the topography height
930	IF ( myid == 0 ) THEN
931
932	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
933
934	DO i = 0, nx + 1
935	DO j = 0, ny + 1
936	zu_s_inner(i,j) = zu(nzb_local(j,i))
937	zw_w_inner(i,j) = zw(nzb_local(j,i))
938	ENDDO
939	ENDDO
940
941	ENDIF
942	!
943	!-- Set flag arrays to be used for masking of grid points
944	DO i = nxlg, nxrg
945	DO j = nysg, nyng
946	DO k = nzb, nzt+1
947	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
948	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
949	ENDDO
950	ENDDO
951	ENDDO
952	#endif
953	ENDIF
954
955	#if ! defined ( __check )
956	!
957	!-- Preliminary: to be removed after completion of the topography code!
958	!-- Set the former default k index arrays nzb_2d
959	nzb_2d = nzb
960
961	!
962	!-- Set the individual index arrays which define the k index from which on
963	!-- the usual finite difference form (which does not use surface fluxes) is
964	!-- applied
965	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
966	nzb_diff_u = nzb_u_inner + 2
967	nzb_diff_v = nzb_v_inner + 2
968	nzb_diff_s_inner = nzb_s_inner + 2
969	nzb_diff_s_outer = nzb_s_outer + 2
970	ELSE
971	nzb_diff_u = nzb_u_inner + 1
972	nzb_diff_v = nzb_v_inner + 1
973	nzb_diff_s_inner = nzb_s_inner + 1
974	nzb_diff_s_outer = nzb_s_outer + 1
975	ENDIF
976
977	!
978	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
979	!-- for limitation of near-wall mixing length l_wall further below
980	corner_nl = 0
981	corner_nr = 0
982	corner_sl = 0
983	corner_sr = 0
984	wall_l = 0
985	wall_n = 0
986	wall_r = 0
987	wall_s = 0
988
989	DO i = nxl, nxr
990	DO j = nys, nyn
991	!
992	!-- u-component
993	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
994	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
995	fym(j,i) = 0.0_wp
996	fyp(j,i) = 1.0_wp
997	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
998	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
999	fym(j,i) = 1.0_wp
1000	fyp(j,i) = 0.0_wp
1001	ENDIF
1002	!
1003	!-- v-component
1004	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1005	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1006	fxm(j,i) = 0.0_wp
1007	fxp(j,i) = 1.0_wp
1008	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1009	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1010	fxm(j,i) = 1.0_wp
1011	fxp(j,i) = 0.0_wp
1012	ENDIF
1013	!
1014	!-- w-component, also used for scalars, separate arrays for shear
1015	!-- production of tke
1016	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1017	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1018	wall_w_y(j,i) = 1.0_wp
1019	fwym(j,i) = 0.0_wp
1020	fwyp(j,i) = 1.0_wp
1021	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1022	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1023	wall_w_y(j,i) = 1.0_wp
1024	fwym(j,i) = 1.0_wp
1025	fwyp(j,i) = 0.0_wp
1026	ENDIF
1027	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1028	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1029	wall_w_x(j,i) = 1.0_wp
1030	fwxm(j,i) = 0.0_wp
1031	fwxp(j,i) = 1.0_wp
1032	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1033	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1034	wall_w_x(j,i) = 1.0_wp
1035	fwxm(j,i) = 1.0_wp
1036	fwxp(j,i) = 0.0_wp
1037	ENDIF
1038	!
1039	!-- Wall and corner locations inside buildings for limitation of
1040	!-- near-wall mixing length l_wall
1041	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1042
1043	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1044
1045	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1046	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1047	nzb_s_inner(j,i-1) ) + 1
1048	ENDIF
1049
1050	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1051	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1052	nzb_s_inner(j,i+1) ) + 1
1053	ENDIF
1054
1055	ENDIF
1056
1057	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1058
1059	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1060	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1061	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1062	nzb_s_inner(j,i-1) ) + 1
1063	ENDIF
1064
1065	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1066	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1067	nzb_s_inner(j,i+1) ) + 1
1068	ENDIF
1069
1070	ENDIF
1071
1072	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1073	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1074	ENDIF
1075
1076	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1077	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1078	ENDIF
1079
1080	ENDDO
1081	ENDDO
1082
1083	!
1084	!-- Calculate wall flag arrays for the multigrid method
1085	IF ( psolver(1:9) == 'multigrid' ) THEN
1086	!
1087	!-- Gridpoint increment of the current level
1088	inc = 1
1089
1090	DO l = maximum_grid_level, 1 , -1
1091
1092	nxl_l = nxl_mg(l)
1093	nxr_l = nxr_mg(l)
1094	nys_l = nys_mg(l)
1095	nyn_l = nyn_mg(l)
1096	nzt_l = nzt_mg(l)
1097
1098	!
1099	!-- Assign the flag level to be calculated
1100	SELECT CASE ( l )
1101	CASE ( 1 )
1102	flags => wall_flags_1
1103	CASE ( 2 )
1104	flags => wall_flags_2
1105	CASE ( 3 )
1106	flags => wall_flags_3
1107	CASE ( 4 )
1108	flags => wall_flags_4
1109	CASE ( 5 )
1110	flags => wall_flags_5
1111	CASE ( 6 )
1112	flags => wall_flags_6
1113	CASE ( 7 )
1114	flags => wall_flags_7
1115	CASE ( 8 )
1116	flags => wall_flags_8
1117	CASE ( 9 )
1118	flags => wall_flags_9
1119	CASE ( 10 )
1120	flags => wall_flags_10
1121	END SELECT
1122
1123	!
1124	!-- Depending on the grid level, set the respective bits in case of
1125	!-- neighbouring walls
1126	!-- Bit 0: wall to the bottom
1127	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1128	!-- Bit 2: wall to the south
1129	!-- Bit 3: wall to the north
1130	!-- Bit 4: wall to the left
1131	!-- Bit 5: wall to the right
1132	!-- Bit 6: inside building
1133
1134	flags = 0
1135
1136	!
1137	!-- In case of masking method, flags are not set and multigrid method
1138	!-- works like FFT-solver
1139	IF ( .NOT. masking_method ) THEN
1140
1141	DO i = nxl_l-1, nxr_l+1
1142	DO j = nys_l-1, nyn_l+1
1143	DO k = nzb, nzt_l+1
1144
1145	!
1146	!-- Inside/outside building (inside building does not need
1147	!-- further tests for walls)
1148	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1149
1150	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1151
1152	ELSE
1153	!
1154	!-- Bottom wall
1155	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1156	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1157	ENDIF
1158	!
1159	!-- South wall
1160	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1161	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1162	ENDIF
1163	!
1164	!-- North wall
1165	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1166	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1167	ENDIF
1168	!
1169	!-- Left wall
1170	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1171	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1172	ENDIF
1173	!
1174	!-- Right wall
1175	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1176	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1177	ENDIF
1178
1179	ENDIF
1180
1181	ENDDO
1182	ENDDO
1183	ENDDO
1184
1185	ENDIF
1186
1187	!
1188	!-- Test output of flag arrays
1189	! i = nxl_l
1190	! WRITE (9,*) ' '
1191	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1192	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1193	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1194	! DO k = nzt_l+1, nzb, -1
1195	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1196	! ENDDO
1197
1198	inc = inc * 2
1199
1200	ENDDO
1201
1202	ENDIF
1203	!
1204	!-- Allocate flags needed for masking walls.
1205	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1206	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1207	wall_flags_0 = 0
1208	wall_flags_00 = 0
1209
1210	IF ( scalar_advec == 'ws-scheme' .OR. &
1211	scalar_advec == 'ws-scheme-mono' ) THEN
1212	!
1213	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1214	!-- near topography, inflow- and outflow boundaries as well as bottom and
1215	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1216	!-- grid points.
1217	DO i = nxl, nxr
1218	DO j = nys, nyn
1219	DO k = nzb_s_inner(j,i)+1, nzt
1220	!
1221	!-- scalar - x-direction
1222	!-- WS1 (0), WS3 (1), WS5 (2)
1223	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1224	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1225	.AND. i == nxr ) ) THEN
1226	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1227	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1228	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1229	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1230	) THEN
1231	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1232	ELSE
1233	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1234	ENDIF
1235	!
1236	!-- scalar - y-direction
1237	!-- WS1 (3), WS3 (4), WS5 (5)
1238	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1239	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1240	.AND. j == nyn ) ) THEN
1241	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1242	!-- WS3
1243	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1244	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1245	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1246	) THEN
1247	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1248	!-- WS5
1249	ELSE
1250	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1251	ENDIF
1252	!
1253	!-- scalar - z-direction
1254	!-- WS1 (6), WS3 (7), WS5 (8)
1255	flag_set = .FALSE.
1256	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1257	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1258	flag_set = .TRUE.
1259	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1260	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1261	flag_set = .TRUE.
1262	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1263	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1264	ENDIF
1265	ENDDO
1266	ENDDO
1267	ENDDO
1268	ENDIF
1269
1270	IF ( momentum_advec == 'ws-scheme' ) THEN
1271	!
1272	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1273	!-- near topography, inflow- and outflow boundaries as well as bottom and
1274	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1275	!-- grid points.
1276	DO i = nxl, nxr
1277	DO j = nys, nyn
1278	DO k = nzb+1, nzt
1279	!
1280	!-- At first, set flags to WS1.
1281	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1282	!-- in order to handle the left/south flux.
1283	!-- near vertical walls.
1284	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1285	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1286	!
1287	!-- u component - x-direction
1288	!-- WS1 (9), WS3 (10), WS5 (11)
1289	IF ( k <= nzb_u_inner(j,i+1) &
1290	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
1291	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
1292	) THEN
1293	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1294	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1295	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
1296	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
1297	) THEN
1298	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1299	!
1300	!-- Clear flag for WS1
1301	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1302	ELSE
1303	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1304	!
1305	!-- Clear flag for WS1
1306	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1307	ENDIF
1308	!
1309	!-- u component - y-direction
1310	!-- WS1 (12), WS3 (13), WS5 (14)
1311	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1312	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1313	.AND. j == nyn ) ) THEN
1314	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1315	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1316	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1317	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1318	) THEN
1319	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1320	!
1321	!-- Clear flag for WS1
1322	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1323	ELSE
1324	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1325	!
1326	!-- Clear flag for WS1
1327	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1328	ENDIF
1329	!
1330	!-- u component - z-direction
1331	!-- WS1 (15), WS3 (16), WS5 (17)
1332	flag_set = .FALSE.
1333	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1334	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1335	flag_set = .TRUE.
1336	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1337	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1338	flag_set = .TRUE.
1339	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1340	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1341	ENDIF
1342
1343	ENDDO
1344	ENDDO
1345	ENDDO
1346
1347	DO i = nxl, nxr
1348	DO j = nys, nyn
1349	DO k = nzb+1, nzt
1350	!
1351	!-- At first, set flags to WS1.
1352	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1353	!-- in order to handle the left/south flux.
1354	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1355	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1356	!
1357	!-- v component - x-direction
1358	!-- WS1 (18), WS3 (19), WS5 (20)
1359	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1360	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
1361	.AND. i == nxr ) ) THEN
1362	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1363	!-- WS3
1364	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1365	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1366	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1367	) THEN
1368	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1369	!
1370	!-- Clear flag for WS1
1371	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1372	ELSE
1373	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1374	!
1375	!-- Clear flag for WS1
1376	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1377	ENDIF
1378	!
1379	!-- v component - y-direction
1380	!-- WS1 (21), WS3 (22), WS5 (23)
1381	IF ( k <= nzb_v_inner(j+1,i) &
1382	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
1383	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
1384	) THEN
1385	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1386	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1387	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
1388	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
1389	) THEN
1390	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1391	!
1392	!-- Clear flag for WS1
1393	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1394	ELSE
1395	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1396	!
1397	!-- Clear flag for WS1
1398	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1399	ENDIF
1400	!
1401	!-- v component - z-direction
1402	!-- WS1 (24), WS3 (25), WS5 (26)
1403	flag_set = .FALSE.
1404	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1405	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1406	flag_set = .TRUE.
1407	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1408	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1409	flag_set = .TRUE.
1410	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1411	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1412	ENDIF
1413
1414	ENDDO
1415	ENDDO
1416	ENDDO
1417	DO i = nxl, nxr
1418	DO j = nys, nyn
1419	DO k = nzb+1, nzt
1420	!
1421	!-- At first, set flags to WS1.
1422	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1423	!-- in order to handle the left/south flux.
1424	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1425	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1426	!
1427	!-- w component - x-direction
1428	!-- WS1 (27), WS3 (28), WS5 (29)
1429	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1430	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1431	.AND. i == nxr ) ) THEN
1432	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1433	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1434	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1435	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1436	) THEN
1437	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1438	!
1439	!-- Clear flag for WS1
1440	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1441	ELSE
1442	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1443	!
1444	!-- Clear flag for WS1
1445	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1446	ENDIF
1447	!
1448	!-- w component - y-direction
1449	!-- WS1 (30), WS3 (31), WS5 (32)
1450	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1451	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1452	.AND. j == nyn ) ) THEN
1453	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1454	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1455	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1456	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1457	) THEN
1458	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1459	!
1460	!-- Clear flag for WS1
1461	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1462	ELSE
1463	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1464	!
1465	!-- Clear flag for WS1
1466	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1467	ENDIF
1468	!
1469	!-- w component - z-direction
1470	!-- WS1 (33), WS3 (34), WS5 (35)
1471	flag_set = .FALSE.
1472	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1473	.OR. k == nzt ) THEN
1474	!
1475	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1476	!-- set, although this is not a prognostic level. However,
1477	!-- contrary to the advection of u,v and s this is necessary
1478	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1479	!-- at k == nzb_w_inner(j,i)+1.
1480	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1481	flag_set = .TRUE.
1482	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1483	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1484	flag_set = .TRUE.
1485	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1486	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1487	ENDIF
1488
1489	ENDDO
1490	ENDDO
1491	ENDDO
1492
1493	ENDIF
1494
1495	!
1496	!-- Exchange 3D integer wall_flags.
1497	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1498	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1499	!
1500	!-- Exchange ghost points for advection flags
1501	CALL exchange_horiz_int( wall_flags_0, nbgp )
1502	CALL exchange_horiz_int( wall_flags_00, nbgp )
1503	!
1504	!-- Set boundary flags at inflow and outflow boundary in case of
1505	!-- non-cyclic boundary conditions.
1506	IF ( inflow_l .OR. outflow_l ) THEN
1507	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1508	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1509	ENDIF
1510
1511	IF ( inflow_r .OR. outflow_r ) THEN
1512	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1513	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1514	ENDIF
1515
1516	IF ( inflow_n .OR. outflow_n ) THEN
1517	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1518	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1519	ENDIF
1520
1521	IF ( inflow_s .OR. outflow_s ) THEN
1522	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1523	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1524	ENDIF
1525
1526	ENDIF
1527
1528	!
1529	!-- In case of topography: limit near-wall mixing length l_wall further:
1530	!-- Go through all points of the subdomain one by one and look for the closest
1531	!-- surface
1532	IF ( TRIM(topography) /= 'flat' ) THEN
1533	DO i = nxl, nxr
1534	DO j = nys, nyn
1535
1536	nzb_si = nzb_s_inner(j,i)
1537	vi = vertical_influence(nzb_si)
1538
1539	IF ( wall_n(j,i) > 0 ) THEN
1540	!
1541	!-- North wall (y distance)
1542	DO k = wall_n(j,i), nzb_si
1543	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1544	ENDDO
1545	!
1546	!-- Above North wall (yz distance)
1547	DO k = nzb_si + 1, nzb_si + vi
1548	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1549	SQRT( 0.25_wp * dy**2 + &
1550	( zu(k) - zw(nzb_si) )**2 ) )
1551	ENDDO
1552	!
1553	!-- Northleft corner (xy distance)
1554	IF ( corner_nl(j,i) > 0 ) THEN
1555	DO k = corner_nl(j,i), nzb_si
1556	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1557	0.5_wp * SQRT( dx2 + dy2 ) )
1558	ENDDO
1559	!
1560	!-- Above Northleft corner (xyz distance)
1561	DO k = nzb_si + 1, nzb_si + vi
1562	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1563	SQRT( 0.25_wp * (dx2 + dy2) + &
1564	( zu(k) - zw(nzb_si) )**2 ) )
1565	ENDDO
1566	ENDIF
1567	!
1568	!-- Northright corner (xy distance)
1569	IF ( corner_nr(j,i) > 0 ) THEN
1570	DO k = corner_nr(j,i), nzb_si
1571	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1572	0.5_wp * SQRT( dx2 + dy2 ) )
1573	ENDDO
1574	!
1575	!-- Above northright corner (xyz distance)
1576	DO k = nzb_si + 1, nzb_si + vi
1577	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1578	SQRT( 0.25_wp * (dx2 + dy2) + &
1579	( zu(k) - zw(nzb_si) )**2 ) )
1580	ENDDO
1581	ENDIF
1582	ENDIF
1583
1584	IF ( wall_s(j,i) > 0 ) THEN
1585	!
1586	!-- South wall (y distance)
1587	DO k = wall_s(j,i), nzb_si
1588	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1589	ENDDO
1590	!
1591	!-- Above south wall (yz distance)
1592	DO k = nzb_si + 1, nzb_si + vi
1593	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1594	SQRT( 0.25_wp * dy**2 + &
1595	( zu(k) - zw(nzb_si) )**2 ) )
1596	ENDDO
1597	!
1598	!-- Southleft corner (xy distance)
1599	IF ( corner_sl(j,i) > 0 ) THEN
1600	DO k = corner_sl(j,i), nzb_si
1601	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1602	0.5_wp * SQRT( dx2 + dy2 ) )
1603	ENDDO
1604	!
1605	!-- Above southleft corner (xyz distance)
1606	DO k = nzb_si + 1, nzb_si + vi
1607	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1608	SQRT( 0.25_wp * (dx2 + dy2) + &
1609	( zu(k) - zw(nzb_si) )**2 ) )
1610	ENDDO
1611	ENDIF
1612	!
1613	!-- Southright corner (xy distance)
1614	IF ( corner_sr(j,i) > 0 ) THEN
1615	DO k = corner_sr(j,i), nzb_si
1616	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1617	0.5_wp * SQRT( dx2 + dy2 ) )
1618	ENDDO
1619	!
1620	!-- Above southright corner (xyz distance)
1621	DO k = nzb_si + 1, nzb_si + vi
1622	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1623	SQRT( 0.25_wp * (dx2 + dy2) + &
1624	( zu(k) - zw(nzb_si) )**2 ) )
1625	ENDDO
1626	ENDIF
1627
1628	ENDIF
1629
1630	IF ( wall_l(j,i) > 0 ) THEN
1631	!
1632	!-- Left wall (x distance)
1633	DO k = wall_l(j,i), nzb_si
1634	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1635	ENDDO
1636	!
1637	!-- Above left wall (xz distance)
1638	DO k = nzb_si + 1, nzb_si + vi
1639	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1640	SQRT( 0.25_wp * dx**2 + &
1641	( zu(k) - zw(nzb_si) )**2 ) )
1642	ENDDO
1643	ENDIF
1644
1645	IF ( wall_r(j,i) > 0 ) THEN
1646	!
1647	!-- Right wall (x distance)
1648	DO k = wall_r(j,i), nzb_si
1649	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1650	ENDDO
1651	!
1652	!-- Above right wall (xz distance)
1653	DO k = nzb_si + 1, nzb_si + vi
1654	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1655	SQRT( 0.25_wp * dx**2 + &
1656	( zu(k) - zw(nzb_si) )**2 ) )
1657	ENDDO
1658
1659	ENDIF
1660
1661	ENDDO
1662	ENDDO
1663
1664	ENDIF
1665
1666	!
1667	!-- Multiplication with wall_adjustment_factor
1668	l_wall = wall_adjustment_factor * l_wall
1669
1670	!
1671	!-- Set lateral boundary conditions for l_wall
1672	CALL exchange_horiz( l_wall, nbgp )
1673
1674	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1675	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1676
1677	#endif
1678
1679	END SUBROUTINE init_grid

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