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source: palm/trunk/SOURCE/init_grid.f90 @ 1682

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

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