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source: palm/trunk/SOURCE/init_grid.f90 @ 1685

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

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