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source: palm/trunk/SOURCE/init_grid.f90 @ 1858

Last change on this file since 1858 was 1846, checked in by raasch, 9 years ago
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1	!> @file init_grid.f90
2	!-------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2016 Leibniz Universitaet Hannover
17	!-------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! -----------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_grid.f90 1846 2016-04-08 08:30:46Z hoffmann $
26	!
27	! 1845 2016-04-08 08:29:13Z raasch
28	! nzb_2d removed
29	!
30	! 1804 2016-04-05 16:30:18Z maronga
31	! Removed code for parameter file check (__check)
32	!
33	! 1779 2016-03-03 08:01:28Z raasch
34	! coupling_char is trimmed at every place it occurs, because it can have
35	! different length now
36	!
37	! 1762 2016-02-25 12:31:13Z hellstea
38	! Introduction of nested domain feature
39	!
40	! 1743 2016-01-13 10:23:51Z raasch
41	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
42	! total domain
43	!
44	! 1691 2015-10-26 16:17:44Z maronga
45	! Renamed prandtl_layer to constant_flux_layer.
46	!
47	! 1682 2015-10-07 23:56:08Z knoop
48	! Code annotations made doxygen readable
49	!
50	! 1677 2015-10-02 13:25:23Z boeske
51	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
52	!
53	! 1675 2015-10-02 08:28:59Z gronemeier
54	! Bugfix: Definition of topography grid levels
55	!
56	! 1660 2015-09-21 08:15:16Z gronemeier
57	! Bugfix: Definition of topography grid levels if vertical grid stretching
58	! starts below the maximum topography height.
59	!
60	! 1580 2015-04-10 13:43:49Z suehring
61	! Bugfix: setting flags for 5th order scheme near buildings
62	!
63	! 1575 2015-03-27 09:56:27Z raasch
64	! adjustments for psolver-queries
65	!
66	! 1557 2015-03-05 16:43:04Z suehring
67	! Adjustment for monotoinic limiter
68	!
69	! 1418 2014-06-06 13:05:08Z fricke
70	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
71	! condition and a negative value for dz_stretch_level the condition
72	! was always true for the whole model domain
73	!
74	! 1409 2014-05-23 12:11:32Z suehring
75	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
76	! j <= nysv
77	!
78	! 1353 2014-04-08 15:21:23Z heinze
79	! REAL constants provided with KIND-attribute
80	!
81	! 1322 2014-03-20 16:38:49Z raasch
82	! REAL constants defined as wp-kind
83	!
84	! 1320 2014-03-20 08:40:49Z raasch
85	! ONLY-attribute added to USE-statements,
86	! kind-parameters added to all INTEGER and REAL declaration statements,
87	! kinds are defined in new module kinds,
88	! revision history before 2012 removed,
89	! comment fields (!:) to be used for variable explanations added to
90	! all variable declaration statements
91	!
92	! 1221 2013-09-10 08:59:13Z raasch
93	! wall_flags_00 introduced to hold bits 32-63,
94	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
95	! loops optimized for openACC (pres + flow_statistics)
96	!
97	! 1092 2013-02-02 11:24:22Z raasch
98	! unused variables removed
99	!
100	! 1069 2012-11-28 16:18:43Z maronga
101	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
102	! ocean model in case of coupled runs
103	!
104	! 1036 2012-10-22 13:43:42Z raasch
105	! code put under GPL (PALM 3.9)
106	!
107	! 1015 2012-09-27 09:23:24Z raasch
108	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
109	! nzb_w_inner+1
110	!
111	! 996 2012-09-07 10:41:47Z raasch
112	! little reformatting
113	!
114	! 978 2012-08-09 08:28:32Z fricke
115	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
116	! Bugfix: Set wall_flags_0 for inflow boundary
117	!
118	! 927 2012-06-06 19:15:04Z raasch
119	! Wall flags are not set for multigrid method in case of masking method
120	!
121	! 864 2012-03-27 15:10:33Z gryschka
122	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
123	! were not correctly defined for k=1.
124	!
125	! 861 2012-03-26 14:18:34Z suehring
126	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
127	! inflow and outflow boundaries as well as near the bottom and the top of the
128	! model domain.!
129	! Initialization of nzb_s_inner and nzb_w_inner.
130	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
131	! while setting wall_flags_0
132	!
133	! 843 2012-02-29 15:16:21Z gryschka
134	! In case of ocean and dirichlet bc for u and v at the bottom
135	! the first u-level ist defined at same height as the first w-level
136	!
137	! 818 2012-02-08 16:11:23Z maronga
138	! Bugfix: topo_height is only required if topography is used. It is thus now
139	! allocated in the topography branch
140	!
141	! 809 2012-01-30 13:32:58Z maronga
142	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
143	!
144	! 807 2012-01-25 11:53:51Z maronga
145	! New cpp directive "__check" implemented which is used by check_namelist_files
146	!
147	! Revision 1.1 1997/08/11 06:17:45 raasch
148	! Initial revision (Testversion)
149	!
150	!
151	! Description:
152	! ------------
153	!> Creating grid depending constants
154	!------------------------------------------------------------------------------!
155	SUBROUTINE init_grid
156
157
158	USE arrays_3d, &
159	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
160	f2_mg, f3_mg, l_grid, l_wall, zu, zw
161
162	USE control_parameters, &
163	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
164	building_length_y, building_wall_left, building_wall_south, &
165	canyon_height, canyon_wall_left, canyon_wall_south, &
166	canyon_width_x, canyon_width_y, constant_flux_layer, &
167	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
168	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
169	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
170	masking_method, maximum_grid_level, message_string, &
171	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
172	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
173	outflow_r, outflow_s, psolver, scalar_advec, topography, &
174	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
175	wall_adjustment_factor
176
177	USE grid_variables, &
178	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
179	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
180	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
181
182	USE indices, &
183	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
184	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
185	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
186	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
187	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
188	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
189	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
190	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
191	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
192	wall_flags_9
193
194	USE kinds
195
196	USE pegrid
197
198	IMPLICIT NONE
199
200	INTEGER(iwp) :: bh !<
201	INTEGER(iwp) :: blx !<
202	INTEGER(iwp) :: bly !<
203	INTEGER(iwp) :: bxl !<
204	INTEGER(iwp) :: bxr !<
205	INTEGER(iwp) :: byn !<
206	INTEGER(iwp) :: bys !<
207	INTEGER(iwp) :: ch !<
208	INTEGER(iwp) :: cwx !<
209	INTEGER(iwp) :: cwy !<
210	INTEGER(iwp) :: cxl !<
211	INTEGER(iwp) :: cxr !<
212	INTEGER(iwp) :: cyn !<
213	INTEGER(iwp) :: cys !<
214	INTEGER(iwp) :: gls !<
215	INTEGER(iwp) :: i !<
216	INTEGER(iwp) :: ii !<
217	INTEGER(iwp) :: inc !<
218	INTEGER(iwp) :: j !<
219	INTEGER(iwp) :: k !<
220	INTEGER(iwp) :: l !<
221	INTEGER(iwp) :: nxl_l !<
222	INTEGER(iwp) :: nxr_l !<
223	INTEGER(iwp) :: nyn_l !<
224	INTEGER(iwp) :: nys_l !<
225	INTEGER(iwp) :: nzb_si !<
226	INTEGER(iwp) :: nzt_l !<
227	INTEGER(iwp) :: vi !<
228
229	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
230
231	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
232	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
233	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
234	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
235	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
236	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
237	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
238	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
239	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
240	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
241
242	LOGICAL :: flag_set = .FALSE. !<
243
244	REAL(wp) :: dx_l !<
245	REAL(wp) :: dy_l !<
246	REAL(wp) :: dz_stretched !<
247
248	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
249
250
251	!
252	!-- Calculation of horizontal array bounds including ghost layers
253	nxlg = nxl - nbgp
254	nxrg = nxr + nbgp
255	nysg = nys - nbgp
256	nyng = nyn + nbgp
257
258	!
259	!-- Allocate grid arrays
260	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
261	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
262
263	!
264	!-- Compute height of u-levels from constant grid length and dz stretch factors
265	IF ( dz == -1.0_wp ) THEN
266	message_string = 'missing dz'
267	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
268	ELSEIF ( dz <= 0.0_wp ) THEN
269	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
270	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
271	ENDIF
272
273	!
274	!-- Define the vertical grid levels
275	IF ( .NOT. ocean ) THEN
276	!
277	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
278	!-- The second u-level (k=1) corresponds to the top of the
279	!-- Prandtl-layer.
280
281	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
282	zu(0) = 0.0_wp
283	! zu(0) = - dz * 0.5_wp
284	ELSE
285	zu(0) = - dz * 0.5_wp
286	ENDIF
287	zu(1) = dz * 0.5_wp
288
289	dz_stretch_level_index = nzt+1
290	dz_stretched = dz
291	DO k = 2, nzt+1
292	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
293	dz_stretched = dz_stretched * dz_stretch_factor
294	dz_stretched = MIN( dz_stretched, dz_max )
295	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
296	ENDIF
297	zu(k) = zu(k-1) + dz_stretched
298	ENDDO
299
300	!
301	!-- Compute the w-levels. They are always staggered half-way between the
302	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
303	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
304	!-- The top w-level is extrapolated linearly.
305	zw(0) = 0.0_wp
306	DO k = 1, nzt
307	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
308	ENDDO
309	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
310
311	ELSE
312	!
313	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
314	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
315	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
316	!-- w-level are defined at same height, but staggered from the second level.
317	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
318	zu(nzt+1) = dz * 0.5_wp
319	zu(nzt) = - dz * 0.5_wp
320
321	dz_stretch_level_index = 0
322	dz_stretched = dz
323	DO k = nzt-1, 0, -1
324	!
325	!-- The default value of dz_stretch_level is positive, thus the first
326	!-- condition is always true. Hence, the second condition is necessary.
327	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
328	.AND. dz_stretched < dz_max ) THEN
329	dz_stretched = dz_stretched * dz_stretch_factor
330	dz_stretched = MIN( dz_stretched, dz_max )
331	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
332	ENDIF
333	zu(k) = zu(k+1) - dz_stretched
334	ENDDO
335
336	!
337	!-- Compute the w-levels. They are always staggered half-way between the
338	!-- corresponding u-levels, except in case of dirichlet bc for u and v
339	!-- at the ground. In this case the first u- and w-level are defined at
340	!-- same height. The top w-level (nzt+1) is not used but set for
341	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
342	zw(nzt+1) = dz
343	zw(nzt) = 0.0_wp
344	DO k = 0, nzt
345	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
346	ENDDO
347
348	!
349	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
350	!-- at same height.
351	IF ( ibc_uv_b == 0 ) THEN
352	zu(0) = zw(0)
353	ENDIF
354
355	ENDIF
356
357	!
358	!-- Compute grid lengths.
359	DO k = 1, nzt+1
360	dzu(k) = zu(k) - zu(k-1)
361	ddzu(k) = 1.0_wp / dzu(k)
362	dzw(k) = zw(k) - zw(k-1)
363	ddzw(k) = 1.0_wp / dzw(k)
364	ENDDO
365
366	DO k = 1, nzt
367	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
368	ENDDO
369
370	!
371	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
372	!-- everywhere. For the actual grid, the grid spacing at the lowest level
373	!-- is only dz/2, but should be dz. Therefore, an additional array
374	!-- containing with appropriate grid information is created for these
375	!-- solvers.
376	IF ( psolver(1:9) /= 'multigrid' ) THEN
377	ALLOCATE( ddzu_pres(1:nzt+1) )
378	ddzu_pres = ddzu
379	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
380	ENDIF
381
382	!
383	!-- In case of multigrid method, compute grid lengths and grid factors for the
384	!-- grid levels
385	IF ( psolver(1:9) == 'multigrid' ) THEN
386
387	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
388	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
389	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
390	f1_mg(nzb+1:nzt,maximum_grid_level), &
391	f2_mg(nzb+1:nzt,maximum_grid_level), &
392	f3_mg(nzb+1:nzt,maximum_grid_level) )
393
394	dzu_mg(:,maximum_grid_level) = dzu
395	!
396	!-- Next line to ensure an equally spaced grid.
397	dzu_mg(1,maximum_grid_level) = dzu(2)
398
399	dzw_mg(:,maximum_grid_level) = dzw
400	nzt_l = nzt
401	DO l = maximum_grid_level-1, 1, -1
402	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
403	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
404	nzt_l = nzt_l / 2
405	DO k = 2, nzt_l+1
406	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
407	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
408	ENDDO
409	ENDDO
410
411	nzt_l = nzt
412	dx_l = dx
413	dy_l = dy
414	DO l = maximum_grid_level, 1, -1
415	ddx2_mg(l) = 1.0_wp / dx_l**2
416	ddy2_mg(l) = 1.0_wp / dy_l**2
417	DO k = nzb+1, nzt_l
418	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
419	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
420	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
421	f2_mg(k,l) + f3_mg(k,l)
422	ENDDO
423	nzt_l = nzt_l / 2
424	dx_l = dx_l * 2.0_wp
425	dy_l = dy_l * 2.0_wp
426	ENDDO
427
428	ENDIF
429
430	!
431	!-- Compute the reciprocal values of the horizontal grid lengths.
432	ddx = 1.0_wp / dx
433	ddy = 1.0_wp / dy
434	dx2 = dx * dx
435	dy2 = dy * dy
436	ddx2 = 1.0_wp / dx2
437	ddy2 = 1.0_wp / dy2
438
439	!
440	!-- Compute the grid-dependent mixing length.
441	DO k = 1, nzt
442	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
443	ENDDO
444
445	!
446	!-- Allocate outer and inner index arrays for topography and set
447	!-- defaults.
448	!-- nzb_local has to contain additional layers of ghost points for calculating
449	!-- the flag arrays needed for the multigrid method
450	gls = 2**( maximum_grid_level )
451	IF ( gls < nbgp ) gls = nbgp
452
453	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
454	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
455	nzb_local(-gls:ny+gls,-gls:nx+gls), &
456	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
457	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
458	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
459	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
460	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
461	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
462	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
463	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
464	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
465	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
466	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
467	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
468	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
469	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
470	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
471	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
472	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
473	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
474	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
475	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
476	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
477	wall_e_x(nysg:nyng,nxlg:nxrg), &
478	wall_e_y(nysg:nyng,nxlg:nxrg), &
479	wall_u(nysg:nyng,nxlg:nxrg), &
480	wall_v(nysg:nyng,nxlg:nxrg), &
481	wall_w_x(nysg:nyng,nxlg:nxrg), &
482	wall_w_y(nysg:nyng,nxlg:nxrg) )
483
484
485
486	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
487
488
489	nzb_s_inner = nzb; nzb_s_outer = nzb
490	nzb_u_inner = nzb; nzb_u_outer = nzb
491	nzb_v_inner = nzb; nzb_v_outer = nzb
492	nzb_w_inner = nzb; nzb_w_outer = nzb
493
494	rflags_s_inner = 1.0_wp
495	rflags_invers = 1.0_wp
496
497	!
498	!-- Define vertical gridpoint from (or to) which on the usual finite difference
499	!-- form (which does not use surface fluxes) is applied
500	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
501	nzb_diff = nzb + 2
502	ELSE
503	nzb_diff = nzb + 1
504	ENDIF
505	IF ( use_top_fluxes ) THEN
506	nzt_diff = nzt - 1
507	ELSE
508	nzt_diff = nzt
509	ENDIF
510
511	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
512	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
513
514	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
515	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
516	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
517	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
518
519	!
520	!-- Initialize near-wall mixing length l_wall only in the vertical direction
521	!-- for the moment,
522	!-- multiplication with wall_adjustment_factor near the end of this routine
523	l_wall(nzb,:,:) = l_grid(1)
524	DO k = nzb+1, nzt
525	l_wall(k,:,:) = l_grid(k)
526	ENDDO
527	l_wall(nzt+1,:,:) = l_grid(nzt)
528
529	ALLOCATE ( vertical_influence(nzb:nzt) )
530	DO k = 1, nzt
531	vertical_influence(k) = MIN ( INT( l_grid(k) / &
532	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
533	ENDDO
534
535	DO k = 1, MAXVAL( nzb_s_inner )
536	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
537	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
538	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
539	'threshold given by only local', &
540	' &horizontal reduction of near_wall ', &
541	'mixing length l_wall', &
542	' &starting from height level k = ', k, '.'
543	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
544	EXIT
545	ENDIF
546	ENDDO
547	vertical_influence(0) = vertical_influence(1)
548
549	DO i = nxlg, nxrg
550	DO j = nysg, nyng
551	DO k = nzb_s_inner(j,i) + 1, &
552	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
553	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
554	ENDDO
555	ENDDO
556	ENDDO
557
558	!
559	!-- Set outer and inner index arrays for non-flat topography.
560	!-- Here consistency checks concerning domain size and periodicity are
561	!-- necessary.
562	!-- Within this SELECT CASE structure only nzb_local is initialized
563	!-- individually depending on the chosen topography type, all other index
564	!-- arrays are initialized further below.
565	SELECT CASE ( TRIM( topography ) )
566
567	CASE ( 'flat' )
568	!
569	!-- nzb_local is required for the multigrid solver
570	nzb_local = 0
571
572	CASE ( 'single_building' )
573	!
574	!-- Single rectangular building, by default centered in the middle of the
575	!-- total domain
576	blx = NINT( building_length_x / dx )
577	bly = NINT( building_length_y / dy )
578	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
579	IF ( ABS( zw(bh ) - building_height ) == &
580	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
581
582	IF ( building_wall_left == 9999999.9_wp ) THEN
583	building_wall_left = ( nx + 1 - blx ) / 2 * dx
584	ENDIF
585	bxl = NINT( building_wall_left / dx )
586	bxr = bxl + blx
587
588	IF ( building_wall_south == 9999999.9_wp ) THEN
589	building_wall_south = ( ny + 1 - bly ) / 2 * dy
590	ENDIF
591	bys = NINT( building_wall_south / dy )
592	byn = bys + bly
593
594	!
595	!-- Building size has to meet some requirements
596	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
597	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
598	WRITE( message_string, * ) 'inconsistent building parameters:', &
599	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
600	'byn=', byn, 'nx=', nx, 'ny=', ny
601	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
602	ENDIF
603
604	!
605	!-- Define the building.
606	nzb_local = 0
607	nzb_local(bys:byn,bxl:bxr) = bh
608
609	CASE ( 'single_street_canyon' )
610	!
611	!-- Single quasi-2D street canyon of infinite length in x or y direction.
612	!-- The canyon is centered in the other direction by default.
613	IF ( canyon_width_x /= 9999999.9_wp ) THEN
614	!
615	!-- Street canyon in y direction
616	cwx = NINT( canyon_width_x / dx )
617	IF ( canyon_wall_left == 9999999.9_wp ) THEN
618	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
619	ENDIF
620	cxl = NINT( canyon_wall_left / dx )
621	cxr = cxl + cwx
622
623	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
624	!
625	!-- Street canyon in x direction
626	cwy = NINT( canyon_width_y / dy )
627	IF ( canyon_wall_south == 9999999.9_wp ) THEN
628	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
629	ENDIF
630	cys = NINT( canyon_wall_south / dy )
631	cyn = cys + cwy
632
633	ELSE
634
635	message_string = 'no street canyon width given'
636	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
637
638	ENDIF
639
640	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
641	IF ( ABS( zw(ch ) - canyon_height ) == &
642	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
643
644	dp_level_ind_b = ch
645	!
646	!-- Street canyon size has to meet some requirements
647	IF ( canyon_width_x /= 9999999.9_wp ) THEN
648	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
649	( ch < 3 ) ) THEN
650	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
651	'&cxl=', cxl, 'cxr=', cxr, &
652	'cwx=', cwx, &
653	'ch=', ch, 'nx=', nx, 'ny=', ny
654	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
655	ENDIF
656	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
657	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
658	( ch < 3 ) ) THEN
659	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
660	'&cys=', cys, 'cyn=', cyn, &
661	'cwy=', cwy, &
662	'ch=', ch, 'nx=', nx, 'ny=', ny
663	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
664	ENDIF
665	ENDIF
666	IF ( canyon_width_x /= 9999999.9_wp .AND. &
667	canyon_width_y /= 9999999.9_wp ) THEN
668	message_string = 'inconsistent canyon parameters:' // &
669	'&street canyon can only be oriented' // &
670	'&either in x- or in y-direction'
671	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
672	ENDIF
673
674	nzb_local = ch
675	IF ( canyon_width_x /= 9999999.9_wp ) THEN
676	nzb_local(:,cxl+1:cxr-1) = 0
677	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
678	nzb_local(cys+1:cyn-1,:) = 0
679	ENDIF
680
681	CASE ( 'read_from_file' )
682
683	ALLOCATE ( topo_height(0:ny,0:nx) )
684
685	DO ii = 0, io_blocks-1
686	IF ( ii == io_group ) THEN
687
688	!
689	!-- Arbitrary irregular topography data in PALM format (exactly
690	!-- matching the grid size and total domain size)
691	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
692	STATUS='OLD', FORM='FORMATTED', ERR=10 )
693	DO j = ny, 0, -1
694	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
695	ENDDO
696
697	GOTO 12
698
699	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
700	' does not exist'
701	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
702
703	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
704	TRIM( coupling_char )
705	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
706
707	12 CLOSE( 90 )
708
709	ENDIF
710	#if defined( __parallel )
711	CALL MPI_BARRIER( comm2d, ierr )
712	#endif
713	ENDDO
714
715	!
716	!-- Calculate the index height of the topography
717	DO i = 0, nx
718	DO j = 0, ny
719	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
720	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
721	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
722	nzb_local(j,i) = nzb_local(j,i) + 1
723	ENDDO
724	ENDDO
725
726	DEALLOCATE ( topo_height )
727	!
728	!-- Add cyclic boundaries (additional layers are for calculating
729	!-- flag arrays needed for the multigrid sover)
730	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
731	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
732	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
733	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
734
735	CASE DEFAULT
736	!
737	!-- The DEFAULT case is reached either if the parameter topography
738	!-- contains a wrong character string or if the user has defined a special
739	!-- case in the user interface. There, the subroutine user_init_grid
740	!-- checks which of these two conditions applies.
741	CALL user_init_grid( gls, nzb_local )
742
743	END SELECT
744	!
745	!-- Determine the maximum level of topography. Furthermore it is used for
746	!-- steering the degradation of order of the applied advection scheme.
747	!-- In case of non-cyclic lateral boundaries, the order of the advection
748	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
749	nzb_max = MAXVAL( nzb_local ) + 1
750	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
751	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
752	nest_domain ) &
753	THEN
754	nzb_max = nzt
755	ENDIF
756
757	!
758	!-- Consistency checks and index array initialization are only required for
759	!-- non-flat topography, also the initialization of topography height arrays
760	!-- zu_s_inner and zw_w_inner
761	IF ( TRIM( topography ) /= 'flat' ) THEN
762
763	!
764	!-- Consistency checks
765	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
766	WRITE( message_string, * ) 'nzb_local values are outside the', &
767	'model domain', &
768	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
769	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
770	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
771	ENDIF
772
773	IF ( bc_lr == 'cyclic' ) THEN
774	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
775	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
776	message_string = 'nzb_local does not fulfill cyclic' // &
777	' boundary condition in x-direction'
778	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
779	ENDIF
780	ENDIF
781	IF ( bc_ns == 'cyclic' ) THEN
782	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
783	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
784	message_string = 'nzb_local does not fulfill cyclic' // &
785	' boundary condition in y-direction'
786	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
787	ENDIF
788	ENDIF
789
790	IF ( topography_grid_convention == 'cell_edge' ) THEN
791	!
792	!-- The array nzb_local as defined using the 'cell_edge' convention
793	!-- describes the actual total size of topography which is defined at the
794	!-- cell edges where u=0 on the topography walls in x-direction and v=0
795	!-- on the topography walls in y-direction. However, PALM uses individual
796	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
797	!-- Therefore, the extent of topography in nzb_local is now reduced by
798	!-- 1dx at the E topography walls and by 1dy at the N topography walls
799	!-- to form the basis for nzb_s_inner.
800	DO j = -gls, ny + gls
801	DO i = -gls, nx
802	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
803	ENDDO
804	ENDDO
805	!-- apply cyclic boundary conditions in x-direction
806	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
807	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
808	DO i = -gls, nx + gls
809	DO j = -gls, ny
810	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
811	ENDDO
812	ENDDO
813	!-- apply cyclic boundary conditions in y-direction
814	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
815	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
816	ENDIF
817
818	!
819	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
820	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
821	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
822
823	!
824	!-- Initialize remaining index arrays:
825	!-- first pre-initialize them with nzb_s_inner...
826	nzb_u_inner = nzb_s_inner
827	nzb_u_outer = nzb_s_inner
828	nzb_v_inner = nzb_s_inner
829	nzb_v_outer = nzb_s_inner
830	nzb_w_outer = nzb_s_inner
831	nzb_s_outer = nzb_s_inner
832
833	!
834	!-- ...then extend pre-initialized arrays in their according directions
835	!-- based on nzb_local using nzb_tmp as a temporary global index array
836
837	!
838	!-- nzb_s_outer:
839	!-- extend nzb_local east-/westwards first, then north-/southwards
840	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
841	DO j = -1, ny + 1
842	DO i = 0, nx
843	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
844	nzb_local(j,i+1) )
845	ENDDO
846	ENDDO
847	DO i = nxl, nxr
848	DO j = nys, nyn
849	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
850	nzb_tmp(j+1,i) )
851	ENDDO
852	!
853	!-- non-cyclic boundary conditions (overwritten by call of
854	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
855	IF ( nys == 0 ) THEN
856	j = -1
857	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
858	ENDIF
859	IF ( nyn == ny ) THEN
860	j = ny + 1
861	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
862	ENDIF
863	ENDDO
864	!
865	!-- nzb_w_outer:
866	!-- identical to nzb_s_outer
867	nzb_w_outer = nzb_s_outer
868
869	!
870	!-- nzb_u_inner:
871	!-- extend nzb_local rightwards only
872	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
873	DO j = -1, ny + 1
874	DO i = 0, nx + 1
875	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
876	ENDDO
877	ENDDO
878	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
879
880	!
881	!-- nzb_u_outer:
882	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
883	DO i = nxl, nxr
884	DO j = nys, nyn
885	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
886	nzb_tmp(j+1,i) )
887	ENDDO
888	!
889	!-- non-cyclic boundary conditions (overwritten by call of
890	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
891	IF ( nys == 0 ) THEN
892	j = -1
893	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
894	ENDIF
895	IF ( nyn == ny ) THEN
896	j = ny + 1
897	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
898	ENDIF
899	ENDDO
900
901	!
902	!-- nzb_v_inner:
903	!-- extend nzb_local northwards only
904	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
905	DO i = -1, nx + 1
906	DO j = 0, ny + 1
907	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
908	ENDDO
909	ENDDO
910	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
911
912	!
913	!-- nzb_v_outer:
914	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
915	DO j = nys, nyn
916	DO i = nxl, nxr
917	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
918	nzb_tmp(j,i+1) )
919	ENDDO
920	!
921	!-- non-cyclic boundary conditions (overwritten by call of
922	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
923	IF ( nxl == 0 ) THEN
924	i = -1
925	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
926	ENDIF
927	IF ( nxr == nx ) THEN
928	i = nx + 1
929	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
930	ENDIF
931	ENDDO
932
933	!
934	!-- Exchange of lateral boundary values (parallel computers) and cyclic
935	!-- boundary conditions, if applicable.
936	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
937	!-- they do not require exchange and are not included here.
938	CALL exchange_horiz_2d_int( nzb_u_inner )
939	CALL exchange_horiz_2d_int( nzb_u_outer )
940	CALL exchange_horiz_2d_int( nzb_v_inner )
941	CALL exchange_horiz_2d_int( nzb_v_outer )
942	CALL exchange_horiz_2d_int( nzb_w_outer )
943	CALL exchange_horiz_2d_int( nzb_s_outer )
944
945	!
946	!-- Allocate and set the arrays containing the topography height
947	IF ( myid == 0 ) THEN
948
949	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
950
951	DO i = 0, nx + 1
952	DO j = 0, ny + 1
953	zu_s_inner(i,j) = zu(nzb_local(j,i))
954	zw_w_inner(i,j) = zw(nzb_local(j,i))
955	ENDDO
956	ENDDO
957
958	ENDIF
959	!
960	!-- Set flag arrays to be used for masking of grid points
961	DO i = nxlg, nxrg
962	DO j = nysg, nyng
963	DO k = nzb, nzt+1
964	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
965	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
966	ENDDO
967	ENDDO
968	ENDDO
969
970	ENDIF
971
972	!
973	!-- Set the individual index arrays which define the k index from which on
974	!-- the usual finite difference form (which does not use surface fluxes) is
975	!-- applied
976	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
977	nzb_diff_u = nzb_u_inner + 2
978	nzb_diff_v = nzb_v_inner + 2
979	nzb_diff_s_inner = nzb_s_inner + 2
980	nzb_diff_s_outer = nzb_s_outer + 2
981	ELSE
982	nzb_diff_u = nzb_u_inner + 1
983	nzb_diff_v = nzb_v_inner + 1
984	nzb_diff_s_inner = nzb_s_inner + 1
985	nzb_diff_s_outer = nzb_s_outer + 1
986	ENDIF
987
988	!
989	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
990	!-- for limitation of near-wall mixing length l_wall further below
991	corner_nl = 0
992	corner_nr = 0
993	corner_sl = 0
994	corner_sr = 0
995	wall_l = 0
996	wall_n = 0
997	wall_r = 0
998	wall_s = 0
999
1000	DO i = nxl, nxr
1001	DO j = nys, nyn
1002	!
1003	!-- u-component
1004	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
1005	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1006	fym(j,i) = 0.0_wp
1007	fyp(j,i) = 1.0_wp
1008	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
1009	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
1010	fym(j,i) = 1.0_wp
1011	fyp(j,i) = 0.0_wp
1012	ENDIF
1013	!
1014	!-- v-component
1015	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1016	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1017	fxm(j,i) = 0.0_wp
1018	fxp(j,i) = 1.0_wp
1019	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1020	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1021	fxm(j,i) = 1.0_wp
1022	fxp(j,i) = 0.0_wp
1023	ENDIF
1024	!
1025	!-- w-component, also used for scalars, separate arrays for shear
1026	!-- production of tke
1027	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1028	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1029	wall_w_y(j,i) = 1.0_wp
1030	fwym(j,i) = 0.0_wp
1031	fwyp(j,i) = 1.0_wp
1032	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1033	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1034	wall_w_y(j,i) = 1.0_wp
1035	fwym(j,i) = 1.0_wp
1036	fwyp(j,i) = 0.0_wp
1037	ENDIF
1038	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1039	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1040	wall_w_x(j,i) = 1.0_wp
1041	fwxm(j,i) = 0.0_wp
1042	fwxp(j,i) = 1.0_wp
1043	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1044	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1045	wall_w_x(j,i) = 1.0_wp
1046	fwxm(j,i) = 1.0_wp
1047	fwxp(j,i) = 0.0_wp
1048	ENDIF
1049	!
1050	!-- Wall and corner locations inside buildings for limitation of
1051	!-- near-wall mixing length l_wall
1052	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1053
1054	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1055
1056	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1057	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1058	nzb_s_inner(j,i-1) ) + 1
1059	ENDIF
1060
1061	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1062	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1063	nzb_s_inner(j,i+1) ) + 1
1064	ENDIF
1065
1066	ENDIF
1067
1068	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1069
1070	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1071	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1072	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1073	nzb_s_inner(j,i-1) ) + 1
1074	ENDIF
1075
1076	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1077	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1078	nzb_s_inner(j,i+1) ) + 1
1079	ENDIF
1080
1081	ENDIF
1082
1083	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1084	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1085	ENDIF
1086
1087	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1088	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1089	ENDIF
1090
1091	ENDDO
1092	ENDDO
1093
1094	!
1095	!-- Calculate wall flag arrays for the multigrid method
1096	IF ( psolver(1:9) == 'multigrid' ) THEN
1097	!
1098	!-- Gridpoint increment of the current level
1099	inc = 1
1100
1101	DO l = maximum_grid_level, 1 , -1
1102
1103	nxl_l = nxl_mg(l)
1104	nxr_l = nxr_mg(l)
1105	nys_l = nys_mg(l)
1106	nyn_l = nyn_mg(l)
1107	nzt_l = nzt_mg(l)
1108
1109	!
1110	!-- Assign the flag level to be calculated
1111	SELECT CASE ( l )
1112	CASE ( 1 )
1113	flags => wall_flags_1
1114	CASE ( 2 )
1115	flags => wall_flags_2
1116	CASE ( 3 )
1117	flags => wall_flags_3
1118	CASE ( 4 )
1119	flags => wall_flags_4
1120	CASE ( 5 )
1121	flags => wall_flags_5
1122	CASE ( 6 )
1123	flags => wall_flags_6
1124	CASE ( 7 )
1125	flags => wall_flags_7
1126	CASE ( 8 )
1127	flags => wall_flags_8
1128	CASE ( 9 )
1129	flags => wall_flags_9
1130	CASE ( 10 )
1131	flags => wall_flags_10
1132	END SELECT
1133
1134	!
1135	!-- Depending on the grid level, set the respective bits in case of
1136	!-- neighbouring walls
1137	!-- Bit 0: wall to the bottom
1138	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1139	!-- Bit 2: wall to the south
1140	!-- Bit 3: wall to the north
1141	!-- Bit 4: wall to the left
1142	!-- Bit 5: wall to the right
1143	!-- Bit 6: inside building
1144
1145	flags = 0
1146
1147	!
1148	!-- In case of masking method, flags are not set and multigrid method
1149	!-- works like FFT-solver
1150	IF ( .NOT. masking_method ) THEN
1151
1152	DO i = nxl_l-1, nxr_l+1
1153	DO j = nys_l-1, nyn_l+1
1154	DO k = nzb, nzt_l+1
1155
1156	!
1157	!-- Inside/outside building (inside building does not need
1158	!-- further tests for walls)
1159	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1160
1161	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1162
1163	ELSE
1164	!
1165	!-- Bottom wall
1166	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1167	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1168	ENDIF
1169	!
1170	!-- South wall
1171	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1172	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1173	ENDIF
1174	!
1175	!-- North wall
1176	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1177	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1178	ENDIF
1179	!
1180	!-- Left wall
1181	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1182	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1183	ENDIF
1184	!
1185	!-- Right wall
1186	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1187	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1188	ENDIF
1189
1190	ENDIF
1191
1192	ENDDO
1193	ENDDO
1194	ENDDO
1195
1196	ENDIF
1197
1198	!
1199	!-- Test output of flag arrays
1200	! i = nxl_l
1201	! WRITE (9,*) ' '
1202	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1203	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1204	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1205	! DO k = nzt_l+1, nzb, -1
1206	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1207	! ENDDO
1208
1209	inc = inc * 2
1210
1211	ENDDO
1212
1213	ENDIF
1214	!
1215	!-- Allocate flags needed for masking walls.
1216	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1217	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1218	wall_flags_0 = 0
1219	wall_flags_00 = 0
1220
1221	IF ( scalar_advec == 'ws-scheme' .OR. &
1222	scalar_advec == 'ws-scheme-mono' ) THEN
1223	!
1224	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1225	!-- near topography, inflow- and outflow boundaries as well as bottom and
1226	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1227	!-- grid points.
1228	DO i = nxl, nxr
1229	DO j = nys, nyn
1230	DO k = nzb_s_inner(j,i)+1, nzt
1231	!
1232	!-- scalar - x-direction
1233	!-- WS1 (0), WS3 (1), WS5 (2)
1234	IF ( k <= nzb_s_inner(j,i+1) .OR. &
1235	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1236	.AND. i == nxl ) .OR. &
1237	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1238	.AND. i == nxr ) ) &
1239	THEN
1240	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1241	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1242	.OR. &
1243	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1244	.AND. i == nxr-1 ) .OR. &
1245	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1246	.AND. i == nxlu ) ) &
1247	THEN
1248	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1249	ELSE
1250	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1251	ENDIF
1252	!
1253	!-- scalar - y-direction
1254	!-- WS1 (3), WS3 (4), WS5 (5)
1255	IF ( k <= nzb_s_inner(j+1,i) .OR. &
1256	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1257	.AND. j == nys ) .OR. &
1258	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1259	.AND. j == nyn ) ) &
1260	THEN
1261	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1262	!
1263	!-- WS3
1264	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1265	.OR. &
1266	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1267	.AND. j == nysv ) .OR. &
1268	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1269	.AND. j == nyn-1 ) ) &
1270	THEN
1271	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1272	!
1273	!-- WS5
1274	ELSE
1275	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1276	ENDIF
1277	!
1278	!-- scalar - z-direction
1279	!-- WS1 (6), WS3 (7), WS5 (8)
1280	flag_set = .FALSE.
1281	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1282	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1283	flag_set = .TRUE.
1284	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1285	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1286	flag_set = .TRUE.
1287	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1288	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1289	ENDIF
1290	ENDDO
1291	ENDDO
1292	ENDDO
1293	ENDIF
1294
1295	IF ( momentum_advec == 'ws-scheme' ) THEN
1296	!
1297	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1298	!-- near topography, inflow- and outflow boundaries as well as bottom and
1299	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1300	!-- grid points.
1301	DO i = nxl, nxr
1302	DO j = nys, nyn
1303	DO k = nzb+1, nzt
1304	!
1305	!-- At first, set flags to WS1.
1306	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1307	!-- in order to handle the left/south flux.
1308	!-- near vertical walls.
1309	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1310	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1311	!
1312	!-- u component - x-direction
1313	!-- WS1 (9), WS3 (10), WS5 (11)
1314	IF ( k <= nzb_u_inner(j,i+1) .OR. &
1315	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1316	.AND. i <= nxlu ) .OR. &
1317	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1318	.AND. i == nxr ) ) &
1319	THEN
1320	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1321	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1322	.OR. &
1323	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1324	.AND. i == nxr-1 ) .OR. &
1325	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1326	.AND. i == nxlu+1) ) &
1327	THEN
1328	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1329	!
1330	!-- Clear flag for WS1
1331	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1332	ELSE
1333	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1334	!
1335	!-- Clear flag for WS1
1336	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1337	ENDIF
1338	!
1339	!-- u component - y-direction
1340	!-- WS1 (12), WS3 (13), WS5 (14)
1341	IF ( k <= nzb_u_inner(j+1,i) .OR. &
1342	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1343	.AND. j == nys ) .OR. &
1344	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1345	.AND. j == nyn ) ) &
1346	THEN
1347	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1348	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1349	.OR. &
1350	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1351	.AND. j == nysv ) .OR. &
1352	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1353	.AND. j == nyn-1 ) ) &
1354	THEN
1355	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1356	!
1357	!-- Clear flag for WS1
1358	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1359	ELSE
1360	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1361	!
1362	!-- Clear flag for WS1
1363	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1364	ENDIF
1365	!
1366	!-- u component - z-direction
1367	!-- WS1 (15), WS3 (16), WS5 (17)
1368	flag_set = .FALSE.
1369	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1370	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1371	flag_set = .TRUE.
1372	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1373	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1374	flag_set = .TRUE.
1375	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1376	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1377	ENDIF
1378
1379	ENDDO
1380	ENDDO
1381	ENDDO
1382
1383	DO i = nxl, nxr
1384	DO j = nys, nyn
1385	DO k = nzb+1, nzt
1386	!
1387	!-- At first, set flags to WS1.
1388	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1389	!-- in order to handle the left/south flux.
1390	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1391	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1392	!
1393	!-- v component - x-direction
1394	!-- WS1 (18), WS3 (19), WS5 (20)
1395	IF ( k <= nzb_v_inner(j,i+1) .OR. &
1396	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1397	.AND. i == nxl ) .OR. &
1398	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1399	.AND. i == nxr ) ) &
1400	THEN
1401	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1402	!
1403	!-- WS3
1404	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1405	.OR. &
1406	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1407	.AND. i == nxr-1 ) .OR. &
1408	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1409	.AND. i == nxlu ) ) &
1410	THEN
1411	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1412	!
1413	!-- Clear flag for WS1
1414	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1415	ELSE
1416	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1417	!
1418	!-- Clear flag for WS1
1419	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1420	ENDIF
1421	!
1422	!-- v component - y-direction
1423	!-- WS1 (21), WS3 (22), WS5 (23)
1424	IF ( k <= nzb_v_inner(j+1,i) .OR. &
1425	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1426	.AND. j <= nysv ) .OR. &
1427	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1428	.AND. j == nyn ) ) &
1429	THEN
1430	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1431	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1432	.OR. &
1433	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1434	.AND. j == nysv+1) .OR. &
1435	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1436	.AND. j == nyn-1 ) ) &
1437	THEN
1438	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1439	!
1440	!-- Clear flag for WS1
1441	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1442	ELSE
1443	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1444	!
1445	!-- Clear flag for WS1
1446	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1447	ENDIF
1448	!
1449	!-- v component - z-direction
1450	!-- WS1 (24), WS3 (25), WS5 (26)
1451	flag_set = .FALSE.
1452	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1453	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1454	flag_set = .TRUE.
1455	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1456	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1457	flag_set = .TRUE.
1458	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1459	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1460	ENDIF
1461
1462	ENDDO
1463	ENDDO
1464	ENDDO
1465	DO i = nxl, nxr
1466	DO j = nys, nyn
1467	DO k = nzb+1, nzt
1468	!
1469	!-- At first, set flags to WS1.
1470	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1471	!-- in order to handle the left/south flux.
1472	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1473	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1474	!
1475	!-- w component - x-direction
1476	!-- WS1 (27), WS3 (28), WS5 (29)
1477	IF ( k <= nzb_w_inner(j,i+1) .OR. &
1478	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1479	.AND. i == nxl ) .OR. &
1480	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1481	.AND. i == nxr ) ) &
1482	THEN
1483	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1484	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1485	.OR. &
1486	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1487	.AND. i == nxr-1 ) .OR. &
1488	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1489	.AND. i == nxlu ) ) &
1490	THEN
1491	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1492	!
1493	!-- Clear flag for WS1
1494	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1495	ELSE
1496	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1497	!
1498	!-- Clear flag for WS1
1499	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1500	ENDIF
1501	!
1502	!-- w component - y-direction
1503	!-- WS1 (30), WS3 (31), WS5 (32)
1504	IF ( k <= nzb_w_inner(j+1,i) .OR. &
1505	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1506	.AND. j == nys ) .OR. &
1507	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1508	.AND. j == nyn ) ) &
1509	THEN
1510	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1511	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1512	.OR. &
1513	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1514	.AND. j == nysv ) .OR. &
1515	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1516	.AND. j == nyn-1 ) ) &
1517	THEN
1518	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1519	!
1520	!-- Clear flag for WS1
1521	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1522	ELSE
1523	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1524	!
1525	!-- Clear flag for WS1
1526	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1527	ENDIF
1528	!
1529	!-- w component - z-direction
1530	!-- WS1 (33), WS3 (34), WS5 (35)
1531	flag_set = .FALSE.
1532	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1533	.OR. k == nzt ) THEN
1534	!
1535	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1536	!-- set, although this is not a prognostic level. However,
1537	!-- contrary to the advection of u,v and s this is necessary
1538	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1539	!-- at k == nzb_w_inner(j,i)+1.
1540	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1541	flag_set = .TRUE.
1542	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1543	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1544	flag_set = .TRUE.
1545	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1546	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1547	ENDIF
1548
1549	ENDDO
1550	ENDDO
1551	ENDDO
1552
1553	ENDIF
1554
1555	!
1556	!-- Exchange 3D integer wall_flags.
1557	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1558	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1559	!
1560	!-- Exchange ghost points for advection flags
1561	CALL exchange_horiz_int( wall_flags_0, nbgp )
1562	CALL exchange_horiz_int( wall_flags_00, nbgp )
1563	!
1564	!-- Set boundary flags at inflow and outflow boundary in case of
1565	!-- non-cyclic boundary conditions.
1566	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1567	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1568	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1569	ENDIF
1570
1571	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
1572	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1573	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1574	ENDIF
1575
1576	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
1577	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1578	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1579	ENDIF
1580
1581	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1582	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1583	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1584	ENDIF
1585
1586	ENDIF
1587
1588	!
1589	!-- In case of topography: limit near-wall mixing length l_wall further:
1590	!-- Go through all points of the subdomain one by one and look for the closest
1591	!-- surface
1592	IF ( TRIM(topography) /= 'flat' ) THEN
1593	DO i = nxl, nxr
1594	DO j = nys, nyn
1595
1596	nzb_si = nzb_s_inner(j,i)
1597	vi = vertical_influence(nzb_si)
1598
1599	IF ( wall_n(j,i) > 0 ) THEN
1600	!
1601	!-- North wall (y distance)
1602	DO k = wall_n(j,i), nzb_si
1603	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1604	ENDDO
1605	!
1606	!-- Above North wall (yz distance)
1607	DO k = nzb_si + 1, nzb_si + vi
1608	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1609	SQRT( 0.25_wp * dy**2 + &
1610	( zu(k) - zw(nzb_si) )**2 ) )
1611	ENDDO
1612	!
1613	!-- Northleft corner (xy distance)
1614	IF ( corner_nl(j,i) > 0 ) THEN
1615	DO k = corner_nl(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 Northleft 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	!-- Northright corner (xy distance)
1629	IF ( corner_nr(j,i) > 0 ) THEN
1630	DO k = corner_nr(j,i), nzb_si
1631	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1632	0.5_wp * SQRT( dx2 + dy2 ) )
1633	ENDDO
1634	!
1635	!-- Above northright corner (xyz distance)
1636	DO k = nzb_si + 1, nzb_si + vi
1637	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1638	SQRT( 0.25_wp * (dx2 + dy2) + &
1639	( zu(k) - zw(nzb_si) )**2 ) )
1640	ENDDO
1641	ENDIF
1642	ENDIF
1643
1644	IF ( wall_s(j,i) > 0 ) THEN
1645	!
1646	!-- South wall (y distance)
1647	DO k = wall_s(j,i), nzb_si
1648	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1649	ENDDO
1650	!
1651	!-- Above south wall (yz distance)
1652	DO k = nzb_si + 1, nzb_si + vi
1653	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1654	SQRT( 0.25_wp * dy**2 + &
1655	( zu(k) - zw(nzb_si) )**2 ) )
1656	ENDDO
1657	!
1658	!-- Southleft corner (xy distance)
1659	IF ( corner_sl(j,i) > 0 ) THEN
1660	DO k = corner_sl(j,i), nzb_si
1661	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1662	0.5_wp * SQRT( dx2 + dy2 ) )
1663	ENDDO
1664	!
1665	!-- Above southleft corner (xyz distance)
1666	DO k = nzb_si + 1, nzb_si + vi
1667	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1668	SQRT( 0.25_wp * (dx2 + dy2) + &
1669	( zu(k) - zw(nzb_si) )**2 ) )
1670	ENDDO
1671	ENDIF
1672	!
1673	!-- Southright corner (xy distance)
1674	IF ( corner_sr(j,i) > 0 ) THEN
1675	DO k = corner_sr(j,i), nzb_si
1676	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1677	0.5_wp * SQRT( dx2 + dy2 ) )
1678	ENDDO
1679	!
1680	!-- Above southright corner (xyz distance)
1681	DO k = nzb_si + 1, nzb_si + vi
1682	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1683	SQRT( 0.25_wp * (dx2 + dy2) + &
1684	( zu(k) - zw(nzb_si) )**2 ) )
1685	ENDDO
1686	ENDIF
1687
1688	ENDIF
1689
1690	IF ( wall_l(j,i) > 0 ) THEN
1691	!
1692	!-- Left wall (x distance)
1693	DO k = wall_l(j,i), nzb_si
1694	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1695	ENDDO
1696	!
1697	!-- Above left wall (xz distance)
1698	DO k = nzb_si + 1, nzb_si + vi
1699	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1700	SQRT( 0.25_wp * dx**2 + &
1701	( zu(k) - zw(nzb_si) )**2 ) )
1702	ENDDO
1703	ENDIF
1704
1705	IF ( wall_r(j,i) > 0 ) THEN
1706	!
1707	!-- Right wall (x distance)
1708	DO k = wall_r(j,i), nzb_si
1709	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1710	ENDDO
1711	!
1712	!-- Above right wall (xz distance)
1713	DO k = nzb_si + 1, nzb_si + vi
1714	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1715	SQRT( 0.25_wp * dx**2 + &
1716	( zu(k) - zw(nzb_si) )**2 ) )
1717	ENDDO
1718
1719	ENDIF
1720
1721	ENDDO
1722	ENDDO
1723
1724	ENDIF
1725
1726	!
1727	!-- Multiplication with wall_adjustment_factor
1728	l_wall = wall_adjustment_factor * l_wall
1729
1730	!
1731	!-- Set lateral boundary conditions for l_wall
1732	CALL exchange_horiz( l_wall, nbgp )
1733
1734	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1735	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1736
1737
1738	END SUBROUTINE init_grid

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