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source: palm/trunk/SOURCE/init_grid.f90 @ 1897

Last change on this file since 1897 was 1887, checked in by suehring, 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 1887 2016-04-21 11:22:12Z raasch $
26	!
27	! 1886 2016-04-21 11:20:47Z suehring
28	! Bugfix: setting advection flags near walls
29	! reformulated index values for nzb_v_inner
30	! variable discriptions added in declaration block
31	!
32	! 1845 2016-04-08 08:29:13Z raasch
33	! nzb_2d removed
34	!
35	! 1804 2016-04-05 16:30:18Z maronga
36	! Removed code for parameter file check (__check)
37	!
38	! 1779 2016-03-03 08:01:28Z raasch
39	! coupling_char is trimmed at every place it occurs, because it can have
40	! different length now
41	!
42	! 1762 2016-02-25 12:31:13Z hellstea
43	! Introduction of nested domain feature
44	!
45	! 1743 2016-01-13 10:23:51Z raasch
46	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
47	! total domain
48	!
49	! 1691 2015-10-26 16:17:44Z maronga
50	! Renamed prandtl_layer to constant_flux_layer.
51	!
52	! 1682 2015-10-07 23:56:08Z knoop
53	! Code annotations made doxygen readable
54	!
55	! 1677 2015-10-02 13:25:23Z boeske
56	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
57	!
58	! 1675 2015-10-02 08:28:59Z gronemeier
59	! Bugfix: Definition of topography grid levels
60	!
61	! 1660 2015-09-21 08:15:16Z gronemeier
62	! Bugfix: Definition of topography grid levels if vertical grid stretching
63	! starts below the maximum topography height.
64	!
65	! 1580 2015-04-10 13:43:49Z suehring
66	! Bugfix: setting flags for 5th order scheme near buildings
67	!
68	! 1575 2015-03-27 09:56:27Z raasch
69	! adjustments for psolver-queries
70	!
71	! 1557 2015-03-05 16:43:04Z suehring
72	! Adjustment for monotoinic limiter
73	!
74	! 1418 2014-06-06 13:05:08Z fricke
75	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
76	! condition and a negative value for dz_stretch_level the condition
77	! was always true for the whole model domain
78	!
79	! 1409 2014-05-23 12:11:32Z suehring
80	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
81	! j <= nysv
82	!
83	! 1353 2014-04-08 15:21:23Z heinze
84	! REAL constants provided with KIND-attribute
85	!
86	! 1322 2014-03-20 16:38:49Z raasch
87	! REAL constants defined as wp-kind
88	!
89	! 1320 2014-03-20 08:40:49Z raasch
90	! ONLY-attribute added to USE-statements,
91	! kind-parameters added to all INTEGER and REAL declaration statements,
92	! kinds are defined in new module kinds,
93	! revision history before 2012 removed,
94	! comment fields (!:) to be used for variable explanations added to
95	! all variable declaration statements
96	!
97	! 1221 2013-09-10 08:59:13Z raasch
98	! wall_flags_00 introduced to hold bits 32-63,
99	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
100	! loops optimized for openACC (pres + flow_statistics)
101	!
102	! 1092 2013-02-02 11:24:22Z raasch
103	! unused variables removed
104	!
105	! 1069 2012-11-28 16:18:43Z maronga
106	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
107	! ocean model in case of coupled runs
108	!
109	! 1036 2012-10-22 13:43:42Z raasch
110	! code put under GPL (PALM 3.9)
111	!
112	! 1015 2012-09-27 09:23:24Z raasch
113	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
114	! nzb_w_inner+1
115	!
116	! 996 2012-09-07 10:41:47Z raasch
117	! little reformatting
118	!
119	! 978 2012-08-09 08:28:32Z fricke
120	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
121	! Bugfix: Set wall_flags_0 for inflow boundary
122	!
123	! 927 2012-06-06 19:15:04Z raasch
124	! Wall flags are not set for multigrid method in case of masking method
125	!
126	! 864 2012-03-27 15:10:33Z gryschka
127	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
128	! were not correctly defined for k=1.
129	!
130	! 861 2012-03-26 14:18:34Z suehring
131	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
132	! inflow and outflow boundaries as well as near the bottom and the top of the
133	! model domain.!
134	! Initialization of nzb_s_inner and nzb_w_inner.
135	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
136	! while setting wall_flags_0
137	!
138	! 843 2012-02-29 15:16:21Z gryschka
139	! In case of ocean and dirichlet bc for u and v at the bottom
140	! the first u-level ist defined at same height as the first w-level
141	!
142	! 818 2012-02-08 16:11:23Z maronga
143	! Bugfix: topo_height is only required if topography is used. It is thus now
144	! allocated in the topography branch
145	!
146	! 809 2012-01-30 13:32:58Z maronga
147	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
148	!
149	! 807 2012-01-25 11:53:51Z maronga
150	! New cpp directive "__check" implemented which is used by check_namelist_files
151	!
152	! Revision 1.1 1997/08/11 06:17:45 raasch
153	! Initial revision (Testversion)
154	!
155	!
156	! Description:
157	! ------------
158	!> Creating grid depending constants
159	!------------------------------------------------------------------------------!
160	SUBROUTINE init_grid
161
162
163	USE arrays_3d, &
164	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
165	f2_mg, f3_mg, l_grid, l_wall, zu, zw
166
167	USE control_parameters, &
168	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
169	building_length_y, building_wall_left, building_wall_south, &
170	canyon_height, canyon_wall_left, canyon_wall_south, &
171	canyon_width_x, canyon_width_y, constant_flux_layer, &
172	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
173	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
174	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
175	masking_method, maximum_grid_level, message_string, &
176	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
177	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
178	outflow_r, outflow_s, psolver, scalar_advec, topography, &
179	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
180	wall_adjustment_factor
181
182	USE grid_variables, &
183	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
184	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
185	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
186
187	USE indices, &
188	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
189	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
190	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
191	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
192	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
193	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
194	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
195	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
196	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
197	wall_flags_9
198
199	USE kinds
200
201	USE pegrid
202
203	IMPLICIT NONE
204
205	INTEGER(iwp) :: bh !< temporary vertical index of building height
206	INTEGER(iwp) :: blx !< grid point number of building size along x
207	INTEGER(iwp) :: bly !< grid point number of building size along y
208	INTEGER(iwp) :: bxl !< index for left building wall
209	INTEGER(iwp) :: bxr !< index for right building wall
210	INTEGER(iwp) :: byn !< index for north building wall
211	INTEGER(iwp) :: bys !< index for south building wall
212	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
213	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
214	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
215	INTEGER(iwp) :: cxl !< index for left canyon wall
216	INTEGER(iwp) :: cxr !< index for right canyon wall
217	INTEGER(iwp) :: cyn !< index for north canyon wall
218	INTEGER(iwp) :: cys !< index for south canyon wall
219	INTEGER(iwp) :: gls !< number of lateral ghost points at total model
220	!< domain boundaries required for multigrid solver
221	INTEGER(iwp) :: i !< index variable along x
222	INTEGER(iwp) :: ii !< loop variable for reading topography file
223	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
224	INTEGER(iwp) :: j !< index variable along y
225	INTEGER(iwp) :: k !< index variable along z
226	INTEGER(iwp) :: l !< loop variable
227	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
228	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
229	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
230	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
231	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
232	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
233	INTEGER(iwp) :: vi !< dummy for vertical influence
234
235	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
236	vertical_influence !< number of vertical grid points above
237	!< obstacle where adjustment of near-
238	!< wall mixing length is required
239
240	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of
241	!< north-left corner location to limit
242	!< near-wall mixing length
243	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
244	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
245	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
246	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to
247	!< adjacent left-facing
248	!< wall
249	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
250	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
251	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
252	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography
253	!< top at cell-center
254	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate
255	!< topography indices
256	!< on u- and v-grid
257
258	LOGICAL :: flag_set = .FALSE. !< steering variable for advection flags
259
260	REAL(wp) :: dx_l !< grid spacing along x on different multigrid level
261	REAL(wp) :: dy_l !< grid spacing along y on different multigrid level
262	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
263
264	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for
265	!< topography height
266
267
268	!
269	!-- Calculation of horizontal array bounds including ghost layers
270	nxlg = nxl - nbgp
271	nxrg = nxr + nbgp
272	nysg = nys - nbgp
273	nyng = nyn + nbgp
274
275	!
276	!-- Allocate grid arrays
277	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
278	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
279
280	!
281	!-- Compute height of u-levels from constant grid length and dz stretch factors
282	IF ( dz == -1.0_wp ) THEN
283	message_string = 'missing dz'
284	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
285	ELSEIF ( dz <= 0.0_wp ) THEN
286	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
287	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
288	ENDIF
289
290	!
291	!-- Define the vertical grid levels
292	IF ( .NOT. ocean ) THEN
293	!
294	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
295	!-- The second u-level (k=1) corresponds to the top of the
296	!-- Prandtl-layer.
297
298	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
299	zu(0) = 0.0_wp
300	! zu(0) = - dz * 0.5_wp
301	ELSE
302	zu(0) = - dz * 0.5_wp
303	ENDIF
304	zu(1) = dz * 0.5_wp
305
306	dz_stretch_level_index = nzt+1
307	dz_stretched = dz
308	DO k = 2, nzt+1
309	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
310	dz_stretched = dz_stretched * dz_stretch_factor
311	dz_stretched = MIN( dz_stretched, dz_max )
312	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
313	ENDIF
314	zu(k) = zu(k-1) + dz_stretched
315	ENDDO
316
317	!
318	!-- Compute the w-levels. They are always staggered half-way between the
319	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
320	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
321	!-- The top w-level is extrapolated linearly.
322	zw(0) = 0.0_wp
323	DO k = 1, nzt
324	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
325	ENDDO
326	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
327
328	ELSE
329	!
330	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
331	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
332	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
333	!-- w-level are defined at same height, but staggered from the second level.
334	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
335	zu(nzt+1) = dz * 0.5_wp
336	zu(nzt) = - dz * 0.5_wp
337
338	dz_stretch_level_index = 0
339	dz_stretched = dz
340	DO k = nzt-1, 0, -1
341	!
342	!-- The default value of dz_stretch_level is positive, thus the first
343	!-- condition is always true. Hence, the second condition is necessary.
344	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
345	.AND. dz_stretched < dz_max ) THEN
346	dz_stretched = dz_stretched * dz_stretch_factor
347	dz_stretched = MIN( dz_stretched, dz_max )
348	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
349	ENDIF
350	zu(k) = zu(k+1) - dz_stretched
351	ENDDO
352
353	!
354	!-- Compute the w-levels. They are always staggered half-way between the
355	!-- corresponding u-levels, except in case of dirichlet bc for u and v
356	!-- at the ground. In this case the first u- and w-level are defined at
357	!-- same height. The top w-level (nzt+1) is not used but set for
358	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
359	zw(nzt+1) = dz
360	zw(nzt) = 0.0_wp
361	DO k = 0, nzt
362	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
363	ENDDO
364
365	!
366	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
367	!-- at same height.
368	IF ( ibc_uv_b == 0 ) THEN
369	zu(0) = zw(0)
370	ENDIF
371
372	ENDIF
373
374	!
375	!-- Compute grid lengths.
376	DO k = 1, nzt+1
377	dzu(k) = zu(k) - zu(k-1)
378	ddzu(k) = 1.0_wp / dzu(k)
379	dzw(k) = zw(k) - zw(k-1)
380	ddzw(k) = 1.0_wp / dzw(k)
381	ENDDO
382
383	DO k = 1, nzt
384	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
385	ENDDO
386
387	!
388	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
389	!-- everywhere. For the actual grid, the grid spacing at the lowest level
390	!-- is only dz/2, but should be dz. Therefore, an additional array
391	!-- containing with appropriate grid information is created for these
392	!-- solvers.
393	IF ( psolver(1:9) /= 'multigrid' ) THEN
394	ALLOCATE( ddzu_pres(1:nzt+1) )
395	ddzu_pres = ddzu
396	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
397	ENDIF
398
399	!
400	!-- In case of multigrid method, compute grid lengths and grid factors for the
401	!-- grid levels
402	IF ( psolver(1:9) == 'multigrid' ) THEN
403
404	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
405	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
406	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
407	f1_mg(nzb+1:nzt,maximum_grid_level), &
408	f2_mg(nzb+1:nzt,maximum_grid_level), &
409	f3_mg(nzb+1:nzt,maximum_grid_level) )
410
411	dzu_mg(:,maximum_grid_level) = dzu
412	!
413	!-- Next line to ensure an equally spaced grid.
414	dzu_mg(1,maximum_grid_level) = dzu(2)
415
416	dzw_mg(:,maximum_grid_level) = dzw
417	nzt_l = nzt
418	DO l = maximum_grid_level-1, 1, -1
419	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
420	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
421	nzt_l = nzt_l / 2
422	DO k = 2, nzt_l+1
423	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
424	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
425	ENDDO
426	ENDDO
427
428	nzt_l = nzt
429	dx_l = dx
430	dy_l = dy
431	DO l = maximum_grid_level, 1, -1
432	ddx2_mg(l) = 1.0_wp / dx_l**2
433	ddy2_mg(l) = 1.0_wp / dy_l**2
434	DO k = nzb+1, nzt_l
435	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
436	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
437	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
438	f2_mg(k,l) + f3_mg(k,l)
439	ENDDO
440	nzt_l = nzt_l / 2
441	dx_l = dx_l * 2.0_wp
442	dy_l = dy_l * 2.0_wp
443	ENDDO
444
445	ENDIF
446
447	!
448	!-- Compute the reciprocal values of the horizontal grid lengths.
449	ddx = 1.0_wp / dx
450	ddy = 1.0_wp / dy
451	dx2 = dx * dx
452	dy2 = dy * dy
453	ddx2 = 1.0_wp / dx2
454	ddy2 = 1.0_wp / dy2
455
456	!
457	!-- Compute the grid-dependent mixing length.
458	DO k = 1, nzt
459	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
460	ENDDO
461
462	!
463	!-- Allocate outer and inner index arrays for topography and set
464	!-- defaults.
465	!-- nzb_local has to contain additional layers of ghost points for calculating
466	!-- the flag arrays needed for the multigrid method
467	gls = 2**( maximum_grid_level )
468	IF ( gls < nbgp ) gls = nbgp
469
470	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
471	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
472	nzb_local(-gls:ny+gls,-gls:nx+gls), &
473	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
474	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
475	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
476	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
477	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
478	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
479	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
480	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
481	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
482	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
483	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
484	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
485	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
486	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
487	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
488	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
489	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
490	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
491	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
492	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
493	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
494	wall_e_x(nysg:nyng,nxlg:nxrg), &
495	wall_e_y(nysg:nyng,nxlg:nxrg), &
496	wall_u(nysg:nyng,nxlg:nxrg), &
497	wall_v(nysg:nyng,nxlg:nxrg), &
498	wall_w_x(nysg:nyng,nxlg:nxrg), &
499	wall_w_y(nysg:nyng,nxlg:nxrg) )
500
501
502
503	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
504
505
506	nzb_s_inner = nzb; nzb_s_outer = nzb
507	nzb_u_inner = nzb; nzb_u_outer = nzb
508	nzb_v_inner = nzb; nzb_v_outer = nzb
509	nzb_w_inner = nzb; nzb_w_outer = nzb
510
511	rflags_s_inner = 1.0_wp
512	rflags_invers = 1.0_wp
513
514	!
515	!-- Define vertical gridpoint from (or to) which on the usual finite difference
516	!-- form (which does not use surface fluxes) is applied
517	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
518	nzb_diff = nzb + 2
519	ELSE
520	nzb_diff = nzb + 1
521	ENDIF
522	IF ( use_top_fluxes ) THEN
523	nzt_diff = nzt - 1
524	ELSE
525	nzt_diff = nzt
526	ENDIF
527
528	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
529	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
530
531	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
532	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
533	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
534	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
535
536	!
537	!-- Initialize near-wall mixing length l_wall only in the vertical direction
538	!-- for the moment,
539	!-- multiplication with wall_adjustment_factor near the end of this routine
540	l_wall(nzb,:,:) = l_grid(1)
541	DO k = nzb+1, nzt
542	l_wall(k,:,:) = l_grid(k)
543	ENDDO
544	l_wall(nzt+1,:,:) = l_grid(nzt)
545
546	ALLOCATE ( vertical_influence(nzb:nzt) )
547	DO k = 1, nzt
548	vertical_influence(k) = MIN ( INT( l_grid(k) / &
549	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
550	ENDDO
551
552	DO k = 1, MAXVAL( nzb_s_inner )
553	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
554	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
555	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
556	'threshold given by only local', &
557	' &horizontal reduction of near_wall ', &
558	'mixing length l_wall', &
559	' &starting from height level k = ', k, '.'
560	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
561	EXIT
562	ENDIF
563	ENDDO
564	vertical_influence(0) = vertical_influence(1)
565
566	DO i = nxlg, nxrg
567	DO j = nysg, nyng
568	DO k = nzb_s_inner(j,i) + 1, &
569	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
570	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
571	ENDDO
572	ENDDO
573	ENDDO
574
575	!
576	!-- Set outer and inner index arrays for non-flat topography.
577	!-- Here consistency checks concerning domain size and periodicity are
578	!-- necessary.
579	!-- Within this SELECT CASE structure only nzb_local is initialized
580	!-- individually depending on the chosen topography type, all other index
581	!-- arrays are initialized further below.
582	SELECT CASE ( TRIM( topography ) )
583
584	CASE ( 'flat' )
585	!
586	!-- nzb_local is required for the multigrid solver
587	nzb_local = 0
588
589	CASE ( 'single_building' )
590	!
591	!-- Single rectangular building, by default centered in the middle of the
592	!-- total domain
593	blx = NINT( building_length_x / dx )
594	bly = NINT( building_length_y / dy )
595	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
596	IF ( ABS( zw(bh ) - building_height ) == &
597	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
598
599	IF ( building_wall_left == 9999999.9_wp ) THEN
600	building_wall_left = ( nx + 1 - blx ) / 2 * dx
601	ENDIF
602	bxl = NINT( building_wall_left / dx )
603	bxr = bxl + blx
604
605	IF ( building_wall_south == 9999999.9_wp ) THEN
606	building_wall_south = ( ny + 1 - bly ) / 2 * dy
607	ENDIF
608	bys = NINT( building_wall_south / dy )
609	byn = bys + bly
610
611	!
612	!-- Building size has to meet some requirements
613	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
614	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
615	WRITE( message_string, * ) 'inconsistent building parameters:', &
616	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
617	'byn=', byn, 'nx=', nx, 'ny=', ny
618	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
619	ENDIF
620
621	!
622	!-- Define the building.
623	nzb_local = 0
624	nzb_local(bys:byn,bxl:bxr) = bh
625
626	CASE ( 'single_street_canyon' )
627	!
628	!-- Single quasi-2D street canyon of infinite length in x or y direction.
629	!-- The canyon is centered in the other direction by default.
630	IF ( canyon_width_x /= 9999999.9_wp ) THEN
631	!
632	!-- Street canyon in y direction
633	cwx = NINT( canyon_width_x / dx )
634	IF ( canyon_wall_left == 9999999.9_wp ) THEN
635	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
636	ENDIF
637	cxl = NINT( canyon_wall_left / dx )
638	cxr = cxl + cwx
639
640	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
641	!
642	!-- Street canyon in x direction
643	cwy = NINT( canyon_width_y / dy )
644	IF ( canyon_wall_south == 9999999.9_wp ) THEN
645	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
646	ENDIF
647	cys = NINT( canyon_wall_south / dy )
648	cyn = cys + cwy
649
650	ELSE
651
652	message_string = 'no street canyon width given'
653	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
654
655	ENDIF
656
657	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
658	IF ( ABS( zw(ch ) - canyon_height ) == &
659	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
660
661	dp_level_ind_b = ch
662	!
663	!-- Street canyon size has to meet some requirements
664	IF ( canyon_width_x /= 9999999.9_wp ) THEN
665	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
666	( ch < 3 ) ) THEN
667	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
668	'&cxl=', cxl, 'cxr=', cxr, &
669	'cwx=', cwx, &
670	'ch=', ch, 'nx=', nx, 'ny=', ny
671	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
672	ENDIF
673	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
674	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
675	( ch < 3 ) ) THEN
676	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
677	'&cys=', cys, 'cyn=', cyn, &
678	'cwy=', cwy, &
679	'ch=', ch, 'nx=', nx, 'ny=', ny
680	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
681	ENDIF
682	ENDIF
683	IF ( canyon_width_x /= 9999999.9_wp .AND. &
684	canyon_width_y /= 9999999.9_wp ) THEN
685	message_string = 'inconsistent canyon parameters:' // &
686	'&street canyon can only be oriented' // &
687	'&either in x- or in y-direction'
688	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
689	ENDIF
690
691	nzb_local = ch
692	IF ( canyon_width_x /= 9999999.9_wp ) THEN
693	nzb_local(:,cxl+1:cxr-1) = 0
694	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
695	nzb_local(cys+1:cyn-1,:) = 0
696	ENDIF
697
698	CASE ( 'read_from_file' )
699
700	ALLOCATE ( topo_height(0:ny,0:nx) )
701
702	DO ii = 0, io_blocks-1
703	IF ( ii == io_group ) THEN
704
705	!
706	!-- Arbitrary irregular topography data in PALM format (exactly
707	!-- matching the grid size and total domain size)
708	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
709	STATUS='OLD', FORM='FORMATTED', ERR=10 )
710	DO j = ny, 0, -1
711	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
712	ENDDO
713
714	GOTO 12
715
716	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
717	' does not exist'
718	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
719
720	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
721	TRIM( coupling_char )
722	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
723
724	12 CLOSE( 90 )
725
726	ENDIF
727	#if defined( __parallel )
728	CALL MPI_BARRIER( comm2d, ierr )
729	#endif
730	ENDDO
731
732	!
733	!-- Calculate the index height of the topography
734	DO i = 0, nx
735	DO j = 0, ny
736	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
737	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
738	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
739	nzb_local(j,i) = nzb_local(j,i) + 1
740	ENDDO
741	ENDDO
742
743	DEALLOCATE ( topo_height )
744	!
745	!-- Add cyclic boundaries (additional layers are for calculating
746	!-- flag arrays needed for the multigrid sover)
747	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
748	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
749	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
750	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
751
752	CASE DEFAULT
753	!
754	!-- The DEFAULT case is reached either if the parameter topography
755	!-- contains a wrong character string or if the user has defined a special
756	!-- case in the user interface. There, the subroutine user_init_grid
757	!-- checks which of these two conditions applies.
758	CALL user_init_grid( gls, nzb_local )
759
760	END SELECT
761	!
762	!-- Determine the maximum level of topography. Furthermore it is used for
763	!-- steering the degradation of order of the applied advection scheme.
764	!-- In case of non-cyclic lateral boundaries, the order of the advection
765	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
766	nzb_max = MAXVAL( nzb_local ) + 1
767	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
768	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
769	nest_domain ) &
770	THEN
771	nzb_max = nzt
772	ENDIF
773
774	!
775	!-- Consistency checks and index array initialization are only required for
776	!-- non-flat topography, also the initialization of topography height arrays
777	!-- zu_s_inner and zw_w_inner
778	IF ( TRIM( topography ) /= 'flat' ) THEN
779
780	!
781	!-- Consistency checks
782	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
783	WRITE( message_string, * ) 'nzb_local values are outside the', &
784	'model domain', &
785	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
786	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
787	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
788	ENDIF
789
790	IF ( bc_lr == 'cyclic' ) THEN
791	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
792	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
793	message_string = 'nzb_local does not fulfill cyclic' // &
794	' boundary condition in x-direction'
795	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
796	ENDIF
797	ENDIF
798	IF ( bc_ns == 'cyclic' ) THEN
799	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
800	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
801	message_string = 'nzb_local does not fulfill cyclic' // &
802	' boundary condition in y-direction'
803	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
804	ENDIF
805	ENDIF
806
807	IF ( topography_grid_convention == 'cell_edge' ) THEN
808	!
809	!-- The array nzb_local as defined using the 'cell_edge' convention
810	!-- describes the actual total size of topography which is defined at the
811	!-- cell edges where u=0 on the topography walls in x-direction and v=0
812	!-- on the topography walls in y-direction. However, PALM uses individual
813	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
814	!-- Therefore, the extent of topography in nzb_local is now reduced by
815	!-- 1dx at the E topography walls and by 1dy at the N topography walls
816	!-- to form the basis for nzb_s_inner.
817	DO j = -gls, ny + gls
818	DO i = -gls, nx
819	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
820	ENDDO
821	ENDDO
822	!-- apply cyclic boundary conditions in x-direction
823	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
824	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
825	DO i = -gls, nx + gls
826	DO j = -gls, ny
827	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
828	ENDDO
829	ENDDO
830	!-- apply cyclic boundary conditions in y-direction
831	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
832	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
833	ENDIF
834
835	!
836	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
837	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
838	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
839
840	!
841	!-- Initialize remaining index arrays:
842	!-- first pre-initialize them with nzb_s_inner...
843	nzb_u_inner = nzb_s_inner
844	nzb_u_outer = nzb_s_inner
845	nzb_v_inner = nzb_s_inner
846	nzb_v_outer = nzb_s_inner
847	nzb_w_outer = nzb_s_inner
848	nzb_s_outer = nzb_s_inner
849
850	!
851	!-- ...then extend pre-initialized arrays in their according directions
852	!-- based on nzb_local using nzb_tmp as a temporary global index array
853
854	!
855	!-- nzb_s_outer:
856	!-- extend nzb_local east-/westwards first, then north-/southwards
857	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
858	DO j = -1, ny + 1
859	DO i = 0, nx
860	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
861	nzb_local(j,i+1) )
862	ENDDO
863	ENDDO
864	DO i = nxl, nxr
865	DO j = nys, nyn
866	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
867	nzb_tmp(j+1,i) )
868	ENDDO
869	!
870	!-- non-cyclic boundary conditions (overwritten by call of
871	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
872	IF ( nys == 0 ) THEN
873	j = -1
874	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
875	ENDIF
876	IF ( nyn == ny ) THEN
877	j = ny + 1
878	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
879	ENDIF
880	ENDDO
881	!
882	!-- nzb_w_outer:
883	!-- identical to nzb_s_outer
884	nzb_w_outer = nzb_s_outer
885
886	!
887	!-- nzb_u_inner:
888	!-- extend nzb_local rightwards only
889	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
890	DO j = -1, ny + 1
891	DO i = 0, nx + 1
892	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
893	ENDDO
894	ENDDO
895	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
896
897	!
898	!-- nzb_u_outer:
899	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
900	DO i = nxl, nxr
901	DO j = nys, nyn
902	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
903	nzb_tmp(j+1,i) )
904	ENDDO
905	!
906	!-- non-cyclic boundary conditions (overwritten by call of
907	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
908	IF ( nys == 0 ) THEN
909	j = -1
910	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
911	ENDIF
912	IF ( nyn == ny ) THEN
913	j = ny + 1
914	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
915	ENDIF
916	ENDDO
917
918	!
919	!-- nzb_v_inner:
920	!-- extend nzb_local northwards only
921	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
922	DO i = -1, nx + 1
923	DO j = 0, ny + 1
924	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
925	ENDDO
926	ENDDO
927	nzb_v_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
928
929	!
930	!-- nzb_v_outer:
931	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
932	DO j = nys, nyn
933	DO i = nxl, nxr
934	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
935	nzb_tmp(j,i+1) )
936	ENDDO
937	!
938	!-- non-cyclic boundary conditions (overwritten by call of
939	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
940	IF ( nxl == 0 ) THEN
941	i = -1
942	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
943	ENDIF
944	IF ( nxr == nx ) THEN
945	i = nx + 1
946	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
947	ENDIF
948	ENDDO
949
950	!
951	!-- Exchange of lateral boundary values (parallel computers) and cyclic
952	!-- boundary conditions, if applicable.
953	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
954	!-- they do not require exchange and are not included here.
955	CALL exchange_horiz_2d_int( nzb_u_inner )
956	CALL exchange_horiz_2d_int( nzb_u_outer )
957	CALL exchange_horiz_2d_int( nzb_v_inner )
958	CALL exchange_horiz_2d_int( nzb_v_outer )
959	CALL exchange_horiz_2d_int( nzb_w_outer )
960	CALL exchange_horiz_2d_int( nzb_s_outer )
961
962	!
963	!-- Allocate and set the arrays containing the topography height
964	IF ( myid == 0 ) THEN
965
966	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
967
968	DO i = 0, nx + 1
969	DO j = 0, ny + 1
970	zu_s_inner(i,j) = zu(nzb_local(j,i))
971	zw_w_inner(i,j) = zw(nzb_local(j,i))
972	ENDDO
973	ENDDO
974
975	ENDIF
976	!
977	!-- Set flag arrays to be used for masking of grid points
978	DO i = nxlg, nxrg
979	DO j = nysg, nyng
980	DO k = nzb, nzt+1
981	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
982	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
983	ENDDO
984	ENDDO
985	ENDDO
986
987	ENDIF
988
989	!
990	!-- Set the individual index arrays which define the k index from which on
991	!-- the usual finite difference form (which does not use surface fluxes) is
992	!-- applied
993	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
994	nzb_diff_u = nzb_u_inner + 2
995	nzb_diff_v = nzb_v_inner + 2
996	nzb_diff_s_inner = nzb_s_inner + 2
997	nzb_diff_s_outer = nzb_s_outer + 2
998	ELSE
999	nzb_diff_u = nzb_u_inner + 1
1000	nzb_diff_v = nzb_v_inner + 1
1001	nzb_diff_s_inner = nzb_s_inner + 1
1002	nzb_diff_s_outer = nzb_s_outer + 1
1003	ENDIF
1004
1005	!
1006	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
1007	!-- for limitation of near-wall mixing length l_wall further below
1008	corner_nl = 0
1009	corner_nr = 0
1010	corner_sl = 0
1011	corner_sr = 0
1012	wall_l = 0
1013	wall_n = 0
1014	wall_r = 0
1015	wall_s = 0
1016
1017	DO i = nxl, nxr
1018	DO j = nys, nyn
1019	!
1020	!-- u-component
1021	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
1022	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1023	fym(j,i) = 0.0_wp
1024	fyp(j,i) = 1.0_wp
1025	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
1026	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
1027	fym(j,i) = 1.0_wp
1028	fyp(j,i) = 0.0_wp
1029	ENDIF
1030	!
1031	!-- v-component
1032	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1033	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1034	fxm(j,i) = 0.0_wp
1035	fxp(j,i) = 1.0_wp
1036	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1037	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1038	fxm(j,i) = 1.0_wp
1039	fxp(j,i) = 0.0_wp
1040	ENDIF
1041	!
1042	!-- w-component, also used for scalars, separate arrays for shear
1043	!-- production of tke
1044	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1045	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1046	wall_w_y(j,i) = 1.0_wp
1047	fwym(j,i) = 0.0_wp
1048	fwyp(j,i) = 1.0_wp
1049	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1050	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1051	wall_w_y(j,i) = 1.0_wp
1052	fwym(j,i) = 1.0_wp
1053	fwyp(j,i) = 0.0_wp
1054	ENDIF
1055	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1056	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1057	wall_w_x(j,i) = 1.0_wp
1058	fwxm(j,i) = 0.0_wp
1059	fwxp(j,i) = 1.0_wp
1060	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1061	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1062	wall_w_x(j,i) = 1.0_wp
1063	fwxm(j,i) = 1.0_wp
1064	fwxp(j,i) = 0.0_wp
1065	ENDIF
1066	!
1067	!-- Wall and corner locations inside buildings for limitation of
1068	!-- near-wall mixing length l_wall
1069	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1070
1071	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1072
1073	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1074	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1075	nzb_s_inner(j,i-1) ) + 1
1076	ENDIF
1077
1078	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1079	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1080	nzb_s_inner(j,i+1) ) + 1
1081	ENDIF
1082
1083	ENDIF
1084
1085	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1086
1087	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1088	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1089	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1090	nzb_s_inner(j,i-1) ) + 1
1091	ENDIF
1092
1093	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1094	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1095	nzb_s_inner(j,i+1) ) + 1
1096	ENDIF
1097
1098	ENDIF
1099
1100	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1101	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1102	ENDIF
1103
1104	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1105	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1106	ENDIF
1107
1108	ENDDO
1109	ENDDO
1110
1111	!
1112	!-- Calculate wall flag arrays for the multigrid method
1113	IF ( psolver(1:9) == 'multigrid' ) THEN
1114	!
1115	!-- Gridpoint increment of the current level
1116	inc = 1
1117
1118	DO l = maximum_grid_level, 1 , -1
1119
1120	nxl_l = nxl_mg(l)
1121	nxr_l = nxr_mg(l)
1122	nys_l = nys_mg(l)
1123	nyn_l = nyn_mg(l)
1124	nzt_l = nzt_mg(l)
1125
1126	!
1127	!-- Assign the flag level to be calculated
1128	SELECT CASE ( l )
1129	CASE ( 1 )
1130	flags => wall_flags_1
1131	CASE ( 2 )
1132	flags => wall_flags_2
1133	CASE ( 3 )
1134	flags => wall_flags_3
1135	CASE ( 4 )
1136	flags => wall_flags_4
1137	CASE ( 5 )
1138	flags => wall_flags_5
1139	CASE ( 6 )
1140	flags => wall_flags_6
1141	CASE ( 7 )
1142	flags => wall_flags_7
1143	CASE ( 8 )
1144	flags => wall_flags_8
1145	CASE ( 9 )
1146	flags => wall_flags_9
1147	CASE ( 10 )
1148	flags => wall_flags_10
1149	END SELECT
1150
1151	!
1152	!-- Depending on the grid level, set the respective bits in case of
1153	!-- neighbouring walls
1154	!-- Bit 0: wall to the bottom
1155	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1156	!-- Bit 2: wall to the south
1157	!-- Bit 3: wall to the north
1158	!-- Bit 4: wall to the left
1159	!-- Bit 5: wall to the right
1160	!-- Bit 6: inside building
1161
1162	flags = 0
1163
1164	!
1165	!-- In case of masking method, flags are not set and multigrid method
1166	!-- works like FFT-solver
1167	IF ( .NOT. masking_method ) THEN
1168
1169	DO i = nxl_l-1, nxr_l+1
1170	DO j = nys_l-1, nyn_l+1
1171	DO k = nzb, nzt_l+1
1172
1173	!
1174	!-- Inside/outside building (inside building does not need
1175	!-- further tests for walls)
1176	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1177
1178	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1179
1180	ELSE
1181	!
1182	!-- Bottom wall
1183	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1184	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1185	ENDIF
1186	!
1187	!-- South wall
1188	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1189	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1190	ENDIF
1191	!
1192	!-- North wall
1193	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1194	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1195	ENDIF
1196	!
1197	!-- Left wall
1198	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1199	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1200	ENDIF
1201	!
1202	!-- Right wall
1203	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1204	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1205	ENDIF
1206
1207	ENDIF
1208
1209	ENDDO
1210	ENDDO
1211	ENDDO
1212
1213	ENDIF
1214
1215	!
1216	!-- Test output of flag arrays
1217	! i = nxl_l
1218	! WRITE (9,*) ' '
1219	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1220	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1221	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1222	! DO k = nzt_l+1, nzb, -1
1223	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1224	! ENDDO
1225
1226	inc = inc * 2
1227
1228	ENDDO
1229
1230	ENDIF
1231	!
1232	!-- Allocate flags needed for masking walls.
1233	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1234	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1235	wall_flags_0 = 0
1236	wall_flags_00 = 0
1237
1238	IF ( scalar_advec == 'ws-scheme' .OR. &
1239	scalar_advec == 'ws-scheme-mono' ) THEN
1240	!
1241	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1242	!-- near topography, inflow- and outflow boundaries as well as bottom and
1243	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1244	!-- grid points.
1245	DO i = nxl, nxr
1246	DO j = nys, nyn
1247	DO k = nzb_s_inner(j,i)+1, nzt
1248	!
1249	!-- scalar - x-direction
1250	!-- WS1 (0), WS3 (1), WS5 (2)
1251	IF ( ( k <= nzb_s_inner(j,i+1) .OR. k <= nzb_s_inner(j,i+2) &
1252	.OR. k <= nzb_s_inner(j,i-1) ) &
1253	.OR. ( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1254	.AND. i == nxl ) .OR. &
1255	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1256	.AND. i == nxr ) ) &
1257	THEN
1258	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1259	ELSEIF ( ( k <= nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i+1)&
1260	.AND. k > nzb_s_inner(j,i+2)&
1261	.AND. k > nzb_s_inner(j,i-1)&
1262	) .OR. &
1263	( k <= nzb_s_inner(j,i-2) .AND. k > nzb_s_inner(j,i+1)&
1264	.AND. k > nzb_s_inner(j,i+2)&
1265	.AND. k > nzb_s_inner(j,i-1)&
1266	) &
1267	.OR. &
1268	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1269	.AND. i == nxr-1 ) .OR. &
1270	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1271	.AND. i == nxlu ) ) &
1272	THEN
1273	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1274	ELSEIF ( k > nzb_s_inner(j,i+1) .AND. k > nzb_s_inner(j,i+2) &
1275	.AND. k > nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i-1) &
1276	.AND. k > nzb_s_inner(j,i-2) ) &
1277	THEN
1278	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1279	ENDIF
1280	!
1281	!-- scalar - y-direction
1282	!-- WS1 (3), WS3 (4), WS5 (5)
1283	IF ( ( k <= nzb_s_inner(j+1,i) .OR. k <= nzb_s_inner(j+2,i) &
1284	.OR. k <= nzb_s_inner(j-1,i) ) &
1285	.OR. &
1286	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1287	.AND. j == nys ) .OR. &
1288	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1289	.AND. j == nyn ) ) &
1290	THEN
1291	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1292	!
1293	!-- WS3
1294	ELSEIF ( ( k <= nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j+1,i)&
1295	.AND. k > nzb_s_inner(j+2,i)&
1296	.AND. k > nzb_s_inner(j-1,i)&
1297	) .OR. &
1298	( k <= nzb_s_inner(j-2,i) .AND. k > nzb_s_inner(j+1,i)&
1299	.AND. k > nzb_s_inner(j+2,i)&
1300	.AND. k > nzb_s_inner(j-1,i)&
1301	) &
1302	.OR. &
1303	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1304	.AND. j == nysv ) .OR. &
1305	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1306	.AND. j == nyn-1 ) ) &
1307	THEN
1308	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1309	!
1310	!-- WS5
1311	ELSEIF ( k > nzb_s_inner(j+1,i) .AND. k > nzb_s_inner(j+2,i) &
1312	.AND. k > nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j-1,i) &
1313	.AND. k > nzb_s_inner(j-2,i) ) &
1314	THEN
1315	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1316	ENDIF
1317	!
1318	!-- scalar - z-direction
1319	!-- WS1 (6), WS3 (7), WS5 (8)
1320	flag_set = .FALSE.
1321	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1322	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1323	flag_set = .TRUE.
1324	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1325	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1326	flag_set = .TRUE.
1327	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1328	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1329	ENDIF
1330
1331	ENDDO
1332	ENDDO
1333	ENDDO
1334	ENDIF
1335
1336	IF ( momentum_advec == 'ws-scheme' ) THEN
1337	!
1338	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1339	!-- near topography, inflow- and outflow boundaries as well as bottom and
1340	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1341	!-- grid points.
1342	DO i = nxl, nxr
1343	DO j = nys, nyn
1344	DO k = nzb+1, nzt
1345	!
1346	!-- At first, set flags to WS1.
1347	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1348	!-- in order to handle the left/south flux.
1349	!-- near vertical walls.
1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1351	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1352	!
1353	!-- u component - x-direction
1354	!-- WS1 (9), WS3 (10), WS5 (11)
1355	IF ( k <= nzb_u_inner(j,i+1) .OR. &
1356	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1357	.AND. i <= nxlu ) .OR. &
1358	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1359	.AND. i == nxr ) ) &
1360	THEN
1361	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1362	ELSEIF ( ( k <= nzb_u_inner(j,i+2) .AND. &
1363	k > nzb_u_inner(j,i+1) ) .OR. &
1364	k <= nzb_u_inner(j,i-1) &
1365	.OR. &
1366	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1367	.AND. i == nxr-1 ) .OR. &
1368	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1369	.AND. i == nxlu+1) ) &
1370	THEN
1371	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1372	!
1373	!-- Clear flag for WS1
1374	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1375	ELSEIF ( k > nzb_u_inner(j,i+1) .AND. k > nzb_u_inner(j,i+2) &
1376	.AND. k > nzb_u_inner(j,i-1) ) &
1377	THEN
1378	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1379	!
1380	!-- Clear flag for WS1
1381	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1382	ENDIF
1383	!
1384	!-- u component - y-direction
1385	!-- WS1 (12), WS3 (13), WS5 (14)
1386	IF ( k <= nzb_u_inner(j+1,i) .OR. &
1387	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1388	.AND. j == nys ) .OR. &
1389	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1390	.AND. j == nyn ) ) &
1391	THEN
1392	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1393	ELSEIF ( ( k <= nzb_u_inner(j+2,i) .AND. &
1394	k > nzb_u_inner(j+1,i) ) .OR. &
1395	k <= nzb_u_inner(j-1,i) &
1396	.OR. &
1397	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1398	.AND. j == nysv ) .OR. &
1399	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1400	.AND. j == nyn-1 ) ) &
1401	THEN
1402	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1403	!
1404	!-- Clear flag for WS1
1405	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1406	ELSEIF ( k > nzb_u_inner(j+1,i) .AND. k > nzb_u_inner(j+2,i) &
1407	.AND. k > nzb_u_inner(j-1,i) ) &
1408	THEN
1409	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1410	!
1411	!-- Clear flag for WS1
1412	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1413	ENDIF
1414	!
1415	!-- u component - z-direction
1416	!-- WS1 (15), WS3 (16), WS5 (17)
1417	flag_set = .FALSE.
1418	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1419	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1420	flag_set = .TRUE.
1421	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1422	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1423	flag_set = .TRUE.
1424	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1425	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1426	ENDIF
1427
1428	ENDDO
1429	ENDDO
1430	ENDDO
1431
1432	DO i = nxl, nxr
1433	DO j = nys, nyn
1434	DO k = nzb+1, nzt
1435	!
1436	!-- At first, set flags to WS1.
1437	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1438	!-- in order to handle the left/south flux.
1439	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1440	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1441	!
1442	!-- v component - x-direction
1443	!-- WS1 (18), WS3 (19), WS5 (20)
1444	IF ( k <= nzb_v_inner(j,i+1) .OR. &
1445	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1446	.AND. i == nxl ) .OR. &
1447	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1448	.AND. i == nxr ) ) &
1449	THEN
1450	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1451	!
1452	!-- WS3
1453	ELSEIF ( ( k <= nzb_v_inner(j,i+2) .AND. &
1454	k > nzb_v_inner(j,i+1) ) .OR. &
1455	k <= nzb_v_inner(j,i-1) &
1456	.OR. &
1457	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1458	.AND. i == nxr-1 ) .OR. &
1459	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1460	.AND. i == nxlu ) ) &
1461	THEN
1462	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1463	!
1464	!-- Clear flag for WS1
1465	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1466	ELSEIF ( k > nzb_v_inner(j,i+1) .AND. k > nzb_v_inner(j,i+2) &
1467	.AND. k > nzb_v_inner(j,i-1) ) &
1468	THEN
1469	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1470	!
1471	!-- Clear flag for WS1
1472	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1473	ENDIF
1474	!
1475	!-- v component - y-direction
1476	!-- WS1 (21), WS3 (22), WS5 (23)
1477	IF ( k <= nzb_v_inner(j+1,i) .OR. &
1478	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1479	.AND. j <= nysv ) .OR. &
1480	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1481	.AND. j == nyn ) ) &
1482	THEN
1483	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1484	ELSEIF ( ( k <= nzb_v_inner(j+2,i) .AND. &
1485	k > nzb_v_inner(j+1,i) ) .OR. &
1486	k <= nzb_v_inner(j-1,i) &
1487	.OR. &
1488	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1489	.AND. j == nysv+1) .OR. &
1490	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1491	.AND. j == nyn-1 ) ) &
1492	THEN
1493	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1494	!
1495	!-- Clear flag for WS1
1496	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1497	ELSEIF ( k > nzb_v_inner(j+1,i) .AND. k > nzb_v_inner(j+2,i) &
1498	.AND. k > nzb_v_inner(j-1,i) ) &
1499	THEN
1500	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1501	!
1502	!-- Clear flag for WS1
1503	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1504	ENDIF
1505	!
1506	!-- v component - z-direction
1507	!-- WS1 (24), WS3 (25), WS5 (26)
1508	flag_set = .FALSE.
1509	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1510	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1511	flag_set = .TRUE.
1512	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1513	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1514	flag_set = .TRUE.
1515	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1516	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1517	ENDIF
1518
1519	ENDDO
1520	ENDDO
1521	ENDDO
1522	DO i = nxl, nxr
1523	DO j = nys, nyn
1524	DO k = nzb+1, nzt
1525	!
1526	!-- At first, set flags to WS1.
1527	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1528	!-- in order to handle the left/south flux.
1529	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1530	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1531	!
1532	!-- w component - x-direction
1533	!-- WS1 (27), WS3 (28), WS5 (29)
1534	IF ( k <= nzb_w_inner(j,i+1) .OR. &
1535	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1536	.AND. i == nxl ) .OR. &
1537	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1538	.AND. i == nxr ) ) &
1539	THEN
1540	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1541	ELSEIF ( ( k <= nzb_w_inner(j,i+2) .AND. &
1542	k > nzb_w_inner(j,i+1) ) .OR. &
1543	k <= nzb_w_inner(j,i-1) &
1544	.OR. &
1545	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1546	.AND. i == nxr-1 ) .OR. &
1547	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1548	.AND. i == nxlu ) ) &
1549	THEN
1550	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1551	!
1552	!-- Clear flag for WS1
1553	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1554	ELSEIF ( k > nzb_w_inner(j,i+1) .AND. k > nzb_w_inner(j,i+2) &
1555	.AND. k > nzb_w_inner(j,i-1) ) &
1556	THEN
1557	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1558	!
1559	!-- Clear flag for WS1
1560	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1561	ENDIF
1562	!
1563	!-- w component - y-direction
1564	!-- WS1 (30), WS3 (31), WS5 (32)
1565	IF ( k <= nzb_w_inner(j+1,i) .OR. &
1566	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1567	.AND. j == nys ) .OR. &
1568	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1569	.AND. j == nyn ) ) &
1570	THEN
1571	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1572	ELSEIF ( ( k <= nzb_w_inner(j+2,i) .AND. &
1573	k > nzb_w_inner(j+1,i) ) .OR. &
1574	k <= nzb_w_inner(j-1,i) &
1575	.OR. &
1576	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1577	.AND. j == nysv ) .OR. &
1578	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1579	.AND. j == nyn-1 ) ) &
1580	THEN
1581	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1582	!
1583	!-- Clear flag for WS1
1584	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1585	ELSEIF ( k > nzb_w_inner(j+1,i) .AND. k > nzb_w_inner(j+2,i) &
1586	.AND. k > nzb_w_inner(j-1,i) ) &
1587	THEN
1588	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1589	!
1590	!-- Clear flag for WS1
1591	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1592	ENDIF
1593	!
1594	!-- w component - z-direction
1595	!-- WS1 (33), WS3 (34), WS5 (35)
1596	flag_set = .FALSE.
1597	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1598	.OR. k == nzt ) THEN
1599	!
1600	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1601	!-- set, although this is not a prognostic level. However,
1602	!-- contrary to the advection of u,v and s this is necessary
1603	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1604	!-- at k == nzb_w_inner(j,i)+1.
1605	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1606	flag_set = .TRUE.
1607	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1608	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1609	flag_set = .TRUE.
1610	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1611	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1612	ENDIF
1613
1614	ENDDO
1615	ENDDO
1616	ENDDO
1617
1618	ENDIF
1619
1620	!
1621	!-- Exchange 3D integer wall_flags.
1622	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1623	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1624	!
1625	!-- Exchange ghost points for advection flags
1626	CALL exchange_horiz_int( wall_flags_0, nbgp )
1627	CALL exchange_horiz_int( wall_flags_00, nbgp )
1628	!
1629	!-- Set boundary flags at inflow and outflow boundary in case of
1630	!-- non-cyclic boundary conditions.
1631	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1632	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1633	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1634	ENDIF
1635
1636	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
1637	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1638	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1639	ENDIF
1640
1641	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
1642	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1643	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1644	ENDIF
1645
1646	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1647	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1648	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1649	ENDIF
1650
1651	ENDIF
1652
1653	!
1654	!-- In case of topography: limit near-wall mixing length l_wall further:
1655	!-- Go through all points of the subdomain one by one and look for the closest
1656	!-- surface
1657	IF ( TRIM(topography) /= 'flat' ) THEN
1658	DO i = nxl, nxr
1659	DO j = nys, nyn
1660
1661	nzb_si = nzb_s_inner(j,i)
1662	vi = vertical_influence(nzb_si)
1663
1664	IF ( wall_n(j,i) > 0 ) THEN
1665	!
1666	!-- North wall (y distance)
1667	DO k = wall_n(j,i), nzb_si
1668	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1669	ENDDO
1670	!
1671	!-- Above North wall (yz distance)
1672	DO k = nzb_si + 1, nzb_si + vi
1673	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1674	SQRT( 0.25_wp * dy**2 + &
1675	( zu(k) - zw(nzb_si) )**2 ) )
1676	ENDDO
1677	!
1678	!-- Northleft corner (xy distance)
1679	IF ( corner_nl(j,i) > 0 ) THEN
1680	DO k = corner_nl(j,i), nzb_si
1681	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1682	0.5_wp * SQRT( dx2 + dy2 ) )
1683	ENDDO
1684	!
1685	!-- Above Northleft corner (xyz distance)
1686	DO k = nzb_si + 1, nzb_si + vi
1687	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1688	SQRT( 0.25_wp * (dx2 + dy2) + &
1689	( zu(k) - zw(nzb_si) )**2 ) )
1690	ENDDO
1691	ENDIF
1692	!
1693	!-- Northright corner (xy distance)
1694	IF ( corner_nr(j,i) > 0 ) THEN
1695	DO k = corner_nr(j,i), nzb_si
1696	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1697	0.5_wp * SQRT( dx2 + dy2 ) )
1698	ENDDO
1699	!
1700	!-- Above northright corner (xyz distance)
1701	DO k = nzb_si + 1, nzb_si + vi
1702	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1703	SQRT( 0.25_wp * (dx2 + dy2) + &
1704	( zu(k) - zw(nzb_si) )**2 ) )
1705	ENDDO
1706	ENDIF
1707	ENDIF
1708
1709	IF ( wall_s(j,i) > 0 ) THEN
1710	!
1711	!-- South wall (y distance)
1712	DO k = wall_s(j,i), nzb_si
1713	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1714	ENDDO
1715	!
1716	!-- Above south wall (yz distance)
1717	DO k = nzb_si + 1, nzb_si + vi
1718	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1719	SQRT( 0.25_wp * dy**2 + &
1720	( zu(k) - zw(nzb_si) )**2 ) )
1721	ENDDO
1722	!
1723	!-- Southleft corner (xy distance)
1724	IF ( corner_sl(j,i) > 0 ) THEN
1725	DO k = corner_sl(j,i), nzb_si
1726	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1727	0.5_wp * SQRT( dx2 + dy2 ) )
1728	ENDDO
1729	!
1730	!-- Above southleft corner (xyz distance)
1731	DO k = nzb_si + 1, nzb_si + vi
1732	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1733	SQRT( 0.25_wp * (dx2 + dy2) + &
1734	( zu(k) - zw(nzb_si) )**2 ) )
1735	ENDDO
1736	ENDIF
1737	!
1738	!-- Southright corner (xy distance)
1739	IF ( corner_sr(j,i) > 0 ) THEN
1740	DO k = corner_sr(j,i), nzb_si
1741	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1742	0.5_wp * SQRT( dx2 + dy2 ) )
1743	ENDDO
1744	!
1745	!-- Above southright corner (xyz distance)
1746	DO k = nzb_si + 1, nzb_si + vi
1747	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1748	SQRT( 0.25_wp * (dx2 + dy2) + &
1749	( zu(k) - zw(nzb_si) )**2 ) )
1750	ENDDO
1751	ENDIF
1752
1753	ENDIF
1754
1755	IF ( wall_l(j,i) > 0 ) THEN
1756	!
1757	!-- Left wall (x distance)
1758	DO k = wall_l(j,i), nzb_si
1759	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1760	ENDDO
1761	!
1762	!-- Above left wall (xz distance)
1763	DO k = nzb_si + 1, nzb_si + vi
1764	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1765	SQRT( 0.25_wp * dx**2 + &
1766	( zu(k) - zw(nzb_si) )**2 ) )
1767	ENDDO
1768	ENDIF
1769
1770	IF ( wall_r(j,i) > 0 ) THEN
1771	!
1772	!-- Right wall (x distance)
1773	DO k = wall_r(j,i), nzb_si
1774	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1775	ENDDO
1776	!
1777	!-- Above right wall (xz distance)
1778	DO k = nzb_si + 1, nzb_si + vi
1779	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1780	SQRT( 0.25_wp * dx**2 + &
1781	( zu(k) - zw(nzb_si) )**2 ) )
1782	ENDDO
1783
1784	ENDIF
1785
1786	ENDDO
1787	ENDDO
1788
1789	ENDIF
1790
1791	!
1792	!-- Multiplication with wall_adjustment_factor
1793	l_wall = wall_adjustment_factor * l_wall
1794
1795	!
1796	!-- Set lateral boundary conditions for l_wall
1797	CALL exchange_horiz( l_wall, nbgp )
1798
1799	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1800	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1801
1802
1803	END SUBROUTINE init_grid

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