Home

Context Navigation

source: palm/trunk/SOURCE/init_grid.f90 @ 1691

Last change on this file since 1691 was 1691, checked in by maronga, 8 years ago
various bugfixes and modifications of the atmosphere-land-surface-radiation interaction. Completely re-written routine to calculate surface fluxes (surface_layer_fluxes.f90) that replaces prandtl_fluxes. Minor formatting corrections and renamings
Property svn:keywords set to `Id`
File size: 65.1 KB

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

Note: See TracBrowser for help on using the repository browser.

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |