Home

Context Navigation

source: palm/trunk/SOURCE/init_grid.f90 @ 1779

Last change on this file since 1779 was 1779, checked in by raasch, 8 years ago
pmc array management changed from linked list to sequential loop; further small changes and cosmetics for the pmc
Property svn:keywords set to `Id`
File size: 69.2 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	! coupling_char is trimmed at every place it occurs, because it can have
22	! different length now
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: init_grid.f90 1779 2016-03-03 08:01:28Z raasch $
27	!
28	! 1762 2016-02-25 12:31:13Z hellstea
29	! Introduction of nested domain feature
30	!
31	! 1743 2016-01-13 10:23:51Z raasch
32	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
33	! total domain
34	!
35	! 1691 2015-10-26 16:17:44Z maronga
36	! Renamed prandtl_layer to constant_flux_layer.
37	!
38	! 1682 2015-10-07 23:56:08Z knoop
39	! Code annotations made doxygen readable
40	!
41	! 1677 2015-10-02 13:25:23Z boeske
42	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
43	!
44	! 1675 2015-10-02 08:28:59Z gronemeier
45	! Bugfix: Definition of topography grid levels
46	!
47	! 1660 2015-09-21 08:15:16Z gronemeier
48	! Bugfix: Definition of topography grid levels if vertical grid stretching
49	! starts below the maximum topography height.
50	!
51	! 1580 2015-04-10 13:43:49Z suehring
52	! Bugfix: setting flags for 5th order scheme near buildings
53	!
54	! 1575 2015-03-27 09:56:27Z raasch
55	! adjustments for psolver-queries
56	!
57	! 1557 2015-03-05 16:43:04Z suehring
58	! Adjustment for monotoinic limiter
59	!
60	! 1418 2014-06-06 13:05:08Z fricke
61	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
62	! condition and a negative value for dz_stretch_level the condition
63	! was always true for the whole model domain
64	!
65	! 1409 2014-05-23 12:11:32Z suehring
66	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
67	! j <= nysv
68	!
69	! 1353 2014-04-08 15:21:23Z heinze
70	! REAL constants provided with KIND-attribute
71	!
72	! 1322 2014-03-20 16:38:49Z raasch
73	! REAL constants defined as wp-kind
74	!
75	! 1320 2014-03-20 08:40:49Z raasch
76	! ONLY-attribute added to USE-statements,
77	! kind-parameters added to all INTEGER and REAL declaration statements,
78	! kinds are defined in new module kinds,
79	! revision history before 2012 removed,
80	! comment fields (!:) to be used for variable explanations added to
81	! all variable declaration statements
82	!
83	! 1221 2013-09-10 08:59:13Z raasch
84	! wall_flags_00 introduced to hold bits 32-63,
85	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
86	! loops optimized for openACC (pres + flow_statistics)
87	!
88	! 1092 2013-02-02 11:24:22Z raasch
89	! unused variables removed
90	!
91	! 1069 2012-11-28 16:18:43Z maronga
92	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
93	! ocean model in case of coupled runs
94	!
95	! 1036 2012-10-22 13:43:42Z raasch
96	! code put under GPL (PALM 3.9)
97	!
98	! 1015 2012-09-27 09:23:24Z raasch
99	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
100	! nzb_w_inner+1
101	!
102	! 996 2012-09-07 10:41:47Z raasch
103	! little reformatting
104	!
105	! 978 2012-08-09 08:28:32Z fricke
106	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
107	! Bugfix: Set wall_flags_0 for inflow boundary
108	!
109	! 927 2012-06-06 19:15:04Z raasch
110	! Wall flags are not set for multigrid method in case of masking method
111	!
112	! 864 2012-03-27 15:10:33Z gryschka
113	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
114	! were not correctly defined for k=1.
115	!
116	! 861 2012-03-26 14:18:34Z suehring
117	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
118	! inflow and outflow boundaries as well as near the bottom and the top of the
119	! model domain.!
120	! Initialization of nzb_s_inner and nzb_w_inner.
121	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
122	! while setting wall_flags_0
123	!
124	! 843 2012-02-29 15:16:21Z gryschka
125	! In case of ocean and dirichlet bc for u and v at the bottom
126	! the first u-level ist defined at same height as the first w-level
127	!
128	! 818 2012-02-08 16:11:23Z maronga
129	! Bugfix: topo_height is only required if topography is used. It is thus now
130	! allocated in the topography branch
131	!
132	! 809 2012-01-30 13:32:58Z maronga
133	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
134	!
135	! 807 2012-01-25 11:53:51Z maronga
136	! New cpp directive "__check" implemented which is used by check_namelist_files
137	!
138	! Revision 1.1 1997/08/11 06:17:45 raasch
139	! Initial revision (Testversion)
140	!
141	!
142	! Description:
143	! ------------
144	!> Creating grid depending constants
145	!------------------------------------------------------------------------------!
146	SUBROUTINE init_grid
147
148
149	USE arrays_3d, &
150	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
151	f2_mg, f3_mg, l_grid, l_wall, zu, zw
152
153	USE control_parameters, &
154	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
155	building_length_y, building_wall_left, building_wall_south, &
156	canyon_height, canyon_wall_left, canyon_wall_south, &
157	canyon_width_x, canyon_width_y, constant_flux_layer, &
158	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
159	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
160	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
161	masking_method, maximum_grid_level, message_string, &
162	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
163	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
164	outflow_r, outflow_s, psolver, scalar_advec, topography, &
165	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
166	wall_adjustment_factor
167
168	USE grid_variables, &
169	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
170	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
171	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
172
173	USE indices, &
174	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
175	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
176	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
177	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
178	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
179	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
180	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
181	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
182	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
183	wall_flags_9
184
185	USE kinds
186
187	USE pegrid
188
189	IMPLICIT NONE
190
191	INTEGER(iwp) :: bh !<
192	INTEGER(iwp) :: blx !<
193	INTEGER(iwp) :: bly !<
194	INTEGER(iwp) :: bxl !<
195	INTEGER(iwp) :: bxr !<
196	INTEGER(iwp) :: byn !<
197	INTEGER(iwp) :: bys !<
198	INTEGER(iwp) :: ch !<
199	INTEGER(iwp) :: cwx !<
200	INTEGER(iwp) :: cwy !<
201	INTEGER(iwp) :: cxl !<
202	INTEGER(iwp) :: cxr !<
203	INTEGER(iwp) :: cyn !<
204	INTEGER(iwp) :: cys !<
205	INTEGER(iwp) :: gls !<
206	INTEGER(iwp) :: i !<
207	INTEGER(iwp) :: ii !<
208	INTEGER(iwp) :: inc !<
209	INTEGER(iwp) :: j !<
210	INTEGER(iwp) :: k !<
211	INTEGER(iwp) :: l !<
212	INTEGER(iwp) :: nxl_l !<
213	INTEGER(iwp) :: nxr_l !<
214	INTEGER(iwp) :: nyn_l !<
215	INTEGER(iwp) :: nys_l !<
216	INTEGER(iwp) :: nzb_si !<
217	INTEGER(iwp) :: nzt_l !<
218	INTEGER(iwp) :: vi !<
219
220	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
221
222	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
223	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
224	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
225	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
226	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
227	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
228	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
229	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
230	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
231	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
232
233	LOGICAL :: flag_set = .FALSE. !<
234
235	REAL(wp) :: dx_l !<
236	REAL(wp) :: dy_l !<
237	REAL(wp) :: dz_stretched !<
238
239	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
240
241
242	!
243	!-- Calculation of horizontal array bounds including ghost layers
244	nxlg = nxl - nbgp
245	nxrg = nxr + nbgp
246	nysg = nys - nbgp
247	nyng = nyn + nbgp
248
249	!
250	!-- Allocate grid arrays
251	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
252	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
253
254	!
255	!-- Compute height of u-levels from constant grid length and dz stretch factors
256	IF ( dz == -1.0_wp ) THEN
257	message_string = 'missing dz'
258	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
259	ELSEIF ( dz <= 0.0_wp ) THEN
260	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
261	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
262	ENDIF
263
264	!
265	!-- Define the vertical grid levels
266	IF ( .NOT. ocean ) THEN
267	!
268	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
269	!-- The second u-level (k=1) corresponds to the top of the
270	!-- Prandtl-layer.
271
272	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
273	zu(0) = 0.0_wp
274	! zu(0) = - dz * 0.5_wp
275	ELSE
276	zu(0) = - dz * 0.5_wp
277	ENDIF
278	zu(1) = dz * 0.5_wp
279
280	dz_stretch_level_index = nzt+1
281	dz_stretched = dz
282	DO k = 2, nzt+1
283	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
284	dz_stretched = dz_stretched * dz_stretch_factor
285	dz_stretched = MIN( dz_stretched, dz_max )
286	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
287	ENDIF
288	zu(k) = zu(k-1) + dz_stretched
289	ENDDO
290
291	!
292	!-- Compute the w-levels. They are always staggered half-way between the
293	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
294	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
295	!-- The top w-level is extrapolated linearly.
296	zw(0) = 0.0_wp
297	DO k = 1, nzt
298	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
299	ENDDO
300	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
301
302	ELSE
303	!
304	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
305	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
306	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
307	!-- w-level are defined at same height, but staggered from the second level.
308	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
309	zu(nzt+1) = dz * 0.5_wp
310	zu(nzt) = - dz * 0.5_wp
311
312	dz_stretch_level_index = 0
313	dz_stretched = dz
314	DO k = nzt-1, 0, -1
315	!
316	!-- The default value of dz_stretch_level is positive, thus the first
317	!-- condition is always true. Hence, the second condition is necessary.
318	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
319	.AND. dz_stretched < dz_max ) THEN
320	dz_stretched = dz_stretched * dz_stretch_factor
321	dz_stretched = MIN( dz_stretched, dz_max )
322	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
323	ENDIF
324	zu(k) = zu(k+1) - dz_stretched
325	ENDDO
326
327	!
328	!-- Compute the w-levels. They are always staggered half-way between the
329	!-- corresponding u-levels, except in case of dirichlet bc for u and v
330	!-- at the ground. In this case the first u- and w-level are defined at
331	!-- same height. The top w-level (nzt+1) is not used but set for
332	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
333	zw(nzt+1) = dz
334	zw(nzt) = 0.0_wp
335	DO k = 0, nzt
336	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
337	ENDDO
338
339	!
340	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
341	!-- at same height.
342	IF ( ibc_uv_b == 0 ) THEN
343	zu(0) = zw(0)
344	ENDIF
345
346	ENDIF
347
348	!
349	!-- Compute grid lengths.
350	DO k = 1, nzt+1
351	dzu(k) = zu(k) - zu(k-1)
352	ddzu(k) = 1.0_wp / dzu(k)
353	dzw(k) = zw(k) - zw(k-1)
354	ddzw(k) = 1.0_wp / dzw(k)
355	ENDDO
356
357	DO k = 1, nzt
358	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
359	ENDDO
360
361	!
362	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
363	!-- everywhere. For the actual grid, the grid spacing at the lowest level
364	!-- is only dz/2, but should be dz. Therefore, an additional array
365	!-- containing with appropriate grid information is created for these
366	!-- solvers.
367	IF ( psolver(1:9) /= 'multigrid' ) THEN
368	ALLOCATE( ddzu_pres(1:nzt+1) )
369	ddzu_pres = ddzu
370	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
371	ENDIF
372
373	!
374	!-- In case of multigrid method, compute grid lengths and grid factors for the
375	!-- grid levels
376	IF ( psolver(1:9) == 'multigrid' ) THEN
377
378	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
379	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
380	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
381	f1_mg(nzb+1:nzt,maximum_grid_level), &
382	f2_mg(nzb+1:nzt,maximum_grid_level), &
383	f3_mg(nzb+1:nzt,maximum_grid_level) )
384
385	dzu_mg(:,maximum_grid_level) = dzu
386	!
387	!-- Next line to ensure an equally spaced grid.
388	dzu_mg(1,maximum_grid_level) = dzu(2)
389
390	dzw_mg(:,maximum_grid_level) = dzw
391	nzt_l = nzt
392	DO l = maximum_grid_level-1, 1, -1
393	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
394	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
395	nzt_l = nzt_l / 2
396	DO k = 2, nzt_l+1
397	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
398	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
399	ENDDO
400	ENDDO
401
402	nzt_l = nzt
403	dx_l = dx
404	dy_l = dy
405	DO l = maximum_grid_level, 1, -1
406	ddx2_mg(l) = 1.0_wp / dx_l**2
407	ddy2_mg(l) = 1.0_wp / dy_l**2
408	DO k = nzb+1, nzt_l
409	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
410	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
411	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
412	f2_mg(k,l) + f3_mg(k,l)
413	ENDDO
414	nzt_l = nzt_l / 2
415	dx_l = dx_l * 2.0_wp
416	dy_l = dy_l * 2.0_wp
417	ENDDO
418
419	ENDIF
420
421	!
422	!-- Compute the reciprocal values of the horizontal grid lengths.
423	ddx = 1.0_wp / dx
424	ddy = 1.0_wp / dy
425	dx2 = dx * dx
426	dy2 = dy * dy
427	ddx2 = 1.0_wp / dx2
428	ddy2 = 1.0_wp / dy2
429
430	!
431	!-- Compute the grid-dependent mixing length.
432	DO k = 1, nzt
433	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
434	ENDDO
435
436	!
437	!-- Allocate outer and inner index arrays for topography and set
438	!-- defaults.
439	!-- nzb_local has to contain additional layers of ghost points for calculating
440	!-- the flag arrays needed for the multigrid method
441	gls = 2**( maximum_grid_level )
442	IF ( gls < nbgp ) gls = nbgp
443
444	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
445	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
446	nzb_local(-gls:ny+gls,-gls:nx+gls), &
447	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
448	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
449	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
450	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
451	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
452	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
453	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
454	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
455	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
456	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
457	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
458	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
459	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
460	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
461	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
462	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
463	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
464	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
465	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
466	nzb_2d(nysg:nyng,nxlg:nxrg), &
467	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
468	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
469	wall_e_x(nysg:nyng,nxlg:nxrg), &
470	wall_e_y(nysg:nyng,nxlg:nxrg), &
471	wall_u(nysg:nyng,nxlg:nxrg), &
472	wall_v(nysg:nyng,nxlg:nxrg), &
473	wall_w_x(nysg:nyng,nxlg:nxrg), &
474	wall_w_y(nysg:nyng,nxlg:nxrg) )
475
476
477
478	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
479
480
481	nzb_s_inner = nzb; nzb_s_outer = nzb
482	nzb_u_inner = nzb; nzb_u_outer = nzb
483	nzb_v_inner = nzb; nzb_v_outer = nzb
484	nzb_w_inner = nzb; nzb_w_outer = nzb
485
486	rflags_s_inner = 1.0_wp
487	rflags_invers = 1.0_wp
488
489	!
490	!-- Define vertical gridpoint from (or to) which on the usual finite difference
491	!-- form (which does not use surface fluxes) is applied
492	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
493	nzb_diff = nzb + 2
494	ELSE
495	nzb_diff = nzb + 1
496	ENDIF
497	IF ( use_top_fluxes ) THEN
498	nzt_diff = nzt - 1
499	ELSE
500	nzt_diff = nzt
501	ENDIF
502
503	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
504	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
505
506	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
507	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
508	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
509	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
510
511	!
512	!-- Initialize near-wall mixing length l_wall only in the vertical direction
513	!-- for the moment,
514	!-- multiplication with wall_adjustment_factor near the end of this routine
515	l_wall(nzb,:,:) = l_grid(1)
516	DO k = nzb+1, nzt
517	l_wall(k,:,:) = l_grid(k)
518	ENDDO
519	l_wall(nzt+1,:,:) = l_grid(nzt)
520
521	ALLOCATE ( vertical_influence(nzb:nzt) )
522	DO k = 1, nzt
523	vertical_influence(k) = MIN ( INT( l_grid(k) / &
524	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
525	ENDDO
526
527	DO k = 1, MAXVAL( nzb_s_inner )
528	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
529	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
530	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
531	'threshold given by only local', &
532	' &horizontal reduction of near_wall ', &
533	'mixing length l_wall', &
534	' &starting from height level k = ', k, '.'
535	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
536	EXIT
537	ENDIF
538	ENDDO
539	vertical_influence(0) = vertical_influence(1)
540
541	DO i = nxlg, nxrg
542	DO j = nysg, nyng
543	DO k = nzb_s_inner(j,i) + 1, &
544	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
545	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
546	ENDDO
547	ENDDO
548	ENDDO
549
550	!
551	!-- Set outer and inner index arrays for non-flat topography.
552	!-- Here consistency checks concerning domain size and periodicity are
553	!-- necessary.
554	!-- Within this SELECT CASE structure only nzb_local is initialized
555	!-- individually depending on the chosen topography type, all other index
556	!-- arrays are initialized further below.
557	SELECT CASE ( TRIM( topography ) )
558
559	CASE ( 'flat' )
560	!
561	!-- nzb_local is required for the multigrid solver
562	nzb_local = 0
563
564	CASE ( 'single_building' )
565	!
566	!-- Single rectangular building, by default centered in the middle of the
567	!-- total domain
568	blx = NINT( building_length_x / dx )
569	bly = NINT( building_length_y / dy )
570	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
571	IF ( ABS( zw(bh ) - building_height ) == &
572	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
573
574	IF ( building_wall_left == 9999999.9_wp ) THEN
575	building_wall_left = ( nx + 1 - blx ) / 2 * dx
576	ENDIF
577	bxl = NINT( building_wall_left / dx )
578	bxr = bxl + blx
579
580	IF ( building_wall_south == 9999999.9_wp ) THEN
581	building_wall_south = ( ny + 1 - bly ) / 2 * dy
582	ENDIF
583	bys = NINT( building_wall_south / dy )
584	byn = bys + bly
585
586	!
587	!-- Building size has to meet some requirements
588	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
589	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
590	WRITE( message_string, * ) 'inconsistent building parameters:', &
591	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
592	'byn=', byn, 'nx=', nx, 'ny=', ny
593	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
594	ENDIF
595
596	!
597	!-- Define the building.
598	nzb_local = 0
599	nzb_local(bys:byn,bxl:bxr) = bh
600
601	CASE ( 'single_street_canyon' )
602	!
603	!-- Single quasi-2D street canyon of infinite length in x or y direction.
604	!-- The canyon is centered in the other direction by default.
605	IF ( canyon_width_x /= 9999999.9_wp ) THEN
606	!
607	!-- Street canyon in y direction
608	cwx = NINT( canyon_width_x / dx )
609	IF ( canyon_wall_left == 9999999.9_wp ) THEN
610	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
611	ENDIF
612	cxl = NINT( canyon_wall_left / dx )
613	cxr = cxl + cwx
614
615	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
616	!
617	!-- Street canyon in x direction
618	cwy = NINT( canyon_width_y / dy )
619	IF ( canyon_wall_south == 9999999.9_wp ) THEN
620	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
621	ENDIF
622	cys = NINT( canyon_wall_south / dy )
623	cyn = cys + cwy
624
625	ELSE
626
627	message_string = 'no street canyon width given'
628	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
629
630	ENDIF
631
632	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
633	IF ( ABS( zw(ch ) - canyon_height ) == &
634	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
635
636	dp_level_ind_b = ch
637	!
638	!-- Street canyon size has to meet some requirements
639	IF ( canyon_width_x /= 9999999.9_wp ) THEN
640	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
641	( ch < 3 ) ) THEN
642	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
643	'&cxl=', cxl, 'cxr=', cxr, &
644	'cwx=', cwx, &
645	'ch=', ch, 'nx=', nx, 'ny=', ny
646	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
647	ENDIF
648	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
649	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
650	( ch < 3 ) ) THEN
651	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
652	'&cys=', cys, 'cyn=', cyn, &
653	'cwy=', cwy, &
654	'ch=', ch, 'nx=', nx, 'ny=', ny
655	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
656	ENDIF
657	ENDIF
658	IF ( canyon_width_x /= 9999999.9_wp .AND. &
659	canyon_width_y /= 9999999.9_wp ) THEN
660	message_string = 'inconsistent canyon parameters:' // &
661	'&street canyon can only be oriented' // &
662	'&either in x- or in y-direction'
663	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
664	ENDIF
665
666	nzb_local = ch
667	IF ( canyon_width_x /= 9999999.9_wp ) THEN
668	nzb_local(:,cxl+1:cxr-1) = 0
669	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
670	nzb_local(cys+1:cyn-1,:) = 0
671	ENDIF
672
673	CASE ( 'read_from_file' )
674
675	ALLOCATE ( topo_height(0:ny,0:nx) )
676
677	DO ii = 0, io_blocks-1
678	IF ( ii == io_group ) THEN
679
680	!
681	!-- Arbitrary irregular topography data in PALM format (exactly
682	!-- matching the grid size and total domain size)
683	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
684	STATUS='OLD', FORM='FORMATTED', ERR=10 )
685	DO j = ny, 0, -1
686	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
687	ENDDO
688
689	GOTO 12
690
691	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
692	' does not exist'
693	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
694
695	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
696	TRIM( coupling_char )
697	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
698
699	12 CLOSE( 90 )
700
701	ENDIF
702	#if defined( __parallel ) && ! defined ( __check )
703	CALL MPI_BARRIER( comm2d, ierr )
704	#endif
705	ENDDO
706
707	!
708	!-- Calculate the index height of the topography
709	DO i = 0, nx
710	DO j = 0, ny
711	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
712	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
713	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
714	nzb_local(j,i) = nzb_local(j,i) + 1
715	ENDDO
716	ENDDO
717
718	DEALLOCATE ( topo_height )
719	!
720	!-- Add cyclic boundaries (additional layers are for calculating
721	!-- flag arrays needed for the multigrid sover)
722	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
723	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
724	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
725	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
726
727	CASE DEFAULT
728	!
729	!-- The DEFAULT case is reached either if the parameter topography
730	!-- contains a wrong character string or if the user has defined a special
731	!-- case in the user interface. There, the subroutine user_init_grid
732	!-- checks which of these two conditions applies.
733	CALL user_init_grid( gls, nzb_local )
734
735	END SELECT
736	!
737	!-- Determine the maximum level of topography. Furthermore it is used for
738	!-- steering the degradation of order of the applied advection scheme.
739	!-- In case of non-cyclic lateral boundaries, the order of the advection
740	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
741	nzb_max = MAXVAL( nzb_local ) + 1
742	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
743	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
744	nest_domain ) &
745	THEN
746	nzb_max = nzt
747	ENDIF
748
749	!
750	!-- Consistency checks and index array initialization are only required for
751	!-- non-flat topography, also the initialization of topography height arrays
752	!-- zu_s_inner and zw_w_inner
753	IF ( TRIM( topography ) /= 'flat' ) THEN
754
755	!
756	!-- Consistency checks
757	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
758	WRITE( message_string, * ) 'nzb_local values are outside the', &
759	'model domain', &
760	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
761	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
762	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
763	ENDIF
764
765	IF ( bc_lr == 'cyclic' ) THEN
766	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
767	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
768	message_string = 'nzb_local does not fulfill cyclic' // &
769	' boundary condition in x-direction'
770	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
771	ENDIF
772	ENDIF
773	IF ( bc_ns == 'cyclic' ) THEN
774	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
775	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
776	message_string = 'nzb_local does not fulfill cyclic' // &
777	' boundary condition in y-direction'
778	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
779	ENDIF
780	ENDIF
781
782	IF ( topography_grid_convention == 'cell_edge' ) THEN
783	!
784	!-- The array nzb_local as defined using the 'cell_edge' convention
785	!-- describes the actual total size of topography which is defined at the
786	!-- cell edges where u=0 on the topography walls in x-direction and v=0
787	!-- on the topography walls in y-direction. However, PALM uses individual
788	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
789	!-- Therefore, the extent of topography in nzb_local is now reduced by
790	!-- 1dx at the E topography walls and by 1dy at the N topography walls
791	!-- to form the basis for nzb_s_inner.
792	DO j = -gls, ny + gls
793	DO i = -gls, nx
794	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
795	ENDDO
796	ENDDO
797	!-- apply cyclic boundary conditions in x-direction
798	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
799	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
800	DO i = -gls, nx + gls
801	DO j = -gls, ny
802	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
803	ENDDO
804	ENDDO
805	!-- apply cyclic boundary conditions in y-direction
806	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
807	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
808	ENDIF
809
810	!
811	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
812	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
813	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
814
815	!
816	!-- Initialize remaining index arrays:
817	!-- first pre-initialize them with nzb_s_inner...
818	nzb_u_inner = nzb_s_inner
819	nzb_u_outer = nzb_s_inner
820	nzb_v_inner = nzb_s_inner
821	nzb_v_outer = nzb_s_inner
822	nzb_w_outer = nzb_s_inner
823	nzb_s_outer = nzb_s_inner
824
825	!
826	!-- ...then extend pre-initialized arrays in their according directions
827	!-- based on nzb_local using nzb_tmp as a temporary global index array
828
829	!
830	!-- nzb_s_outer:
831	!-- extend nzb_local east-/westwards first, then north-/southwards
832	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
833	DO j = -1, ny + 1
834	DO i = 0, nx
835	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
836	nzb_local(j,i+1) )
837	ENDDO
838	ENDDO
839	DO i = nxl, nxr
840	DO j = nys, nyn
841	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
842	nzb_tmp(j+1,i) )
843	ENDDO
844	!
845	!-- non-cyclic boundary conditions (overwritten by call of
846	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
847	IF ( nys == 0 ) THEN
848	j = -1
849	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
850	ENDIF
851	IF ( nyn == ny ) THEN
852	j = ny + 1
853	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
854	ENDIF
855	ENDDO
856	!
857	!-- nzb_w_outer:
858	!-- identical to nzb_s_outer
859	nzb_w_outer = nzb_s_outer
860
861	!
862	!-- nzb_u_inner:
863	!-- extend nzb_local rightwards only
864	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
865	DO j = -1, ny + 1
866	DO i = 0, nx + 1
867	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
868	ENDDO
869	ENDDO
870	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
871
872	!
873	!-- nzb_u_outer:
874	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
875	DO i = nxl, nxr
876	DO j = nys, nyn
877	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
878	nzb_tmp(j+1,i) )
879	ENDDO
880	!
881	!-- non-cyclic boundary conditions (overwritten by call of
882	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
883	IF ( nys == 0 ) THEN
884	j = -1
885	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
886	ENDIF
887	IF ( nyn == ny ) THEN
888	j = ny + 1
889	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
890	ENDIF
891	ENDDO
892
893	!
894	!-- nzb_v_inner:
895	!-- extend nzb_local northwards only
896	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
897	DO i = -1, nx + 1
898	DO j = 0, ny + 1
899	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
900	ENDDO
901	ENDDO
902	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
903
904	!
905	!-- nzb_v_outer:
906	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
907	DO j = nys, nyn
908	DO i = nxl, nxr
909	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
910	nzb_tmp(j,i+1) )
911	ENDDO
912	!
913	!-- non-cyclic boundary conditions (overwritten by call of
914	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
915	IF ( nxl == 0 ) THEN
916	i = -1
917	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
918	ENDIF
919	IF ( nxr == nx ) THEN
920	i = nx + 1
921	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
922	ENDIF
923	ENDDO
924	#if ! defined ( __check )
925	!
926	!-- Exchange of lateral boundary values (parallel computers) and cyclic
927	!-- boundary conditions, if applicable.
928	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
929	!-- they do not require exchange and are not included here.
930	CALL exchange_horiz_2d_int( nzb_u_inner )
931	CALL exchange_horiz_2d_int( nzb_u_outer )
932	CALL exchange_horiz_2d_int( nzb_v_inner )
933	CALL exchange_horiz_2d_int( nzb_v_outer )
934	CALL exchange_horiz_2d_int( nzb_w_outer )
935	CALL exchange_horiz_2d_int( nzb_s_outer )
936
937	!
938	!-- Allocate and set the arrays containing the topography height
939	IF ( myid == 0 ) THEN
940
941	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
942
943	DO i = 0, nx + 1
944	DO j = 0, ny + 1
945	zu_s_inner(i,j) = zu(nzb_local(j,i))
946	zw_w_inner(i,j) = zw(nzb_local(j,i))
947	ENDDO
948	ENDDO
949
950	ENDIF
951	!
952	!-- Set flag arrays to be used for masking of grid points
953	DO i = nxlg, nxrg
954	DO j = nysg, nyng
955	DO k = nzb, nzt+1
956	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
957	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
958	ENDDO
959	ENDDO
960	ENDDO
961	#endif
962	ENDIF
963
964	#if ! defined ( __check )
965	!
966	!-- Preliminary: to be removed after completion of the topography code!
967	!-- Set the former default k index arrays nzb_2d
968	nzb_2d = nzb
969
970	!
971	!-- Set the individual index arrays which define the k index from which on
972	!-- the usual finite difference form (which does not use surface fluxes) is
973	!-- applied
974	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
975	nzb_diff_u = nzb_u_inner + 2
976	nzb_diff_v = nzb_v_inner + 2
977	nzb_diff_s_inner = nzb_s_inner + 2
978	nzb_diff_s_outer = nzb_s_outer + 2
979	ELSE
980	nzb_diff_u = nzb_u_inner + 1
981	nzb_diff_v = nzb_v_inner + 1
982	nzb_diff_s_inner = nzb_s_inner + 1
983	nzb_diff_s_outer = nzb_s_outer + 1
984	ENDIF
985
986	!
987	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
988	!-- for limitation of near-wall mixing length l_wall further below
989	corner_nl = 0
990	corner_nr = 0
991	corner_sl = 0
992	corner_sr = 0
993	wall_l = 0
994	wall_n = 0
995	wall_r = 0
996	wall_s = 0
997
998	DO i = nxl, nxr
999	DO j = nys, nyn
1000	!
1001	!-- u-component
1002	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
1003	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1004	fym(j,i) = 0.0_wp
1005	fyp(j,i) = 1.0_wp
1006	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
1007	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
1008	fym(j,i) = 1.0_wp
1009	fyp(j,i) = 0.0_wp
1010	ENDIF
1011	!
1012	!-- v-component
1013	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1014	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1015	fxm(j,i) = 0.0_wp
1016	fxp(j,i) = 1.0_wp
1017	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1018	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1019	fxm(j,i) = 1.0_wp
1020	fxp(j,i) = 0.0_wp
1021	ENDIF
1022	!
1023	!-- w-component, also used for scalars, separate arrays for shear
1024	!-- production of tke
1025	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1026	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1027	wall_w_y(j,i) = 1.0_wp
1028	fwym(j,i) = 0.0_wp
1029	fwyp(j,i) = 1.0_wp
1030	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1031	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1032	wall_w_y(j,i) = 1.0_wp
1033	fwym(j,i) = 1.0_wp
1034	fwyp(j,i) = 0.0_wp
1035	ENDIF
1036	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1037	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1038	wall_w_x(j,i) = 1.0_wp
1039	fwxm(j,i) = 0.0_wp
1040	fwxp(j,i) = 1.0_wp
1041	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1042	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1043	wall_w_x(j,i) = 1.0_wp
1044	fwxm(j,i) = 1.0_wp
1045	fwxp(j,i) = 0.0_wp
1046	ENDIF
1047	!
1048	!-- Wall and corner locations inside buildings for limitation of
1049	!-- near-wall mixing length l_wall
1050	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1051
1052	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1053
1054	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1055	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1056	nzb_s_inner(j,i-1) ) + 1
1057	ENDIF
1058
1059	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1060	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1061	nzb_s_inner(j,i+1) ) + 1
1062	ENDIF
1063
1064	ENDIF
1065
1066	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1067
1068	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1069	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1070	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1071	nzb_s_inner(j,i-1) ) + 1
1072	ENDIF
1073
1074	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1075	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1076	nzb_s_inner(j,i+1) ) + 1
1077	ENDIF
1078
1079	ENDIF
1080
1081	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1082	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1083	ENDIF
1084
1085	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1086	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1087	ENDIF
1088
1089	ENDDO
1090	ENDDO
1091
1092	!
1093	!-- Calculate wall flag arrays for the multigrid method
1094	IF ( psolver(1:9) == 'multigrid' ) THEN
1095	!
1096	!-- Gridpoint increment of the current level
1097	inc = 1
1098
1099	DO l = maximum_grid_level, 1 , -1
1100
1101	nxl_l = nxl_mg(l)
1102	nxr_l = nxr_mg(l)
1103	nys_l = nys_mg(l)
1104	nyn_l = nyn_mg(l)
1105	nzt_l = nzt_mg(l)
1106
1107	!
1108	!-- Assign the flag level to be calculated
1109	SELECT CASE ( l )
1110	CASE ( 1 )
1111	flags => wall_flags_1
1112	CASE ( 2 )
1113	flags => wall_flags_2
1114	CASE ( 3 )
1115	flags => wall_flags_3
1116	CASE ( 4 )
1117	flags => wall_flags_4
1118	CASE ( 5 )
1119	flags => wall_flags_5
1120	CASE ( 6 )
1121	flags => wall_flags_6
1122	CASE ( 7 )
1123	flags => wall_flags_7
1124	CASE ( 8 )
1125	flags => wall_flags_8
1126	CASE ( 9 )
1127	flags => wall_flags_9
1128	CASE ( 10 )
1129	flags => wall_flags_10
1130	END SELECT
1131
1132	!
1133	!-- Depending on the grid level, set the respective bits in case of
1134	!-- neighbouring walls
1135	!-- Bit 0: wall to the bottom
1136	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1137	!-- Bit 2: wall to the south
1138	!-- Bit 3: wall to the north
1139	!-- Bit 4: wall to the left
1140	!-- Bit 5: wall to the right
1141	!-- Bit 6: inside building
1142
1143	flags = 0
1144
1145	!
1146	!-- In case of masking method, flags are not set and multigrid method
1147	!-- works like FFT-solver
1148	IF ( .NOT. masking_method ) THEN
1149
1150	DO i = nxl_l-1, nxr_l+1
1151	DO j = nys_l-1, nyn_l+1
1152	DO k = nzb, nzt_l+1
1153
1154	!
1155	!-- Inside/outside building (inside building does not need
1156	!-- further tests for walls)
1157	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1158
1159	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1160
1161	ELSE
1162	!
1163	!-- Bottom wall
1164	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1165	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1166	ENDIF
1167	!
1168	!-- South wall
1169	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1170	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1171	ENDIF
1172	!
1173	!-- North wall
1174	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1175	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1176	ENDIF
1177	!
1178	!-- Left wall
1179	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1180	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1181	ENDIF
1182	!
1183	!-- Right wall
1184	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1185	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1186	ENDIF
1187
1188	ENDIF
1189
1190	ENDDO
1191	ENDDO
1192	ENDDO
1193
1194	ENDIF
1195
1196	!
1197	!-- Test output of flag arrays
1198	! i = nxl_l
1199	! WRITE (9,*) ' '
1200	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1201	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1202	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1203	! DO k = nzt_l+1, nzb, -1
1204	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1205	! ENDDO
1206
1207	inc = inc * 2
1208
1209	ENDDO
1210
1211	ENDIF
1212	!
1213	!-- Allocate flags needed for masking walls.
1214	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1215	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1216	wall_flags_0 = 0
1217	wall_flags_00 = 0
1218
1219	IF ( scalar_advec == 'ws-scheme' .OR. &
1220	scalar_advec == 'ws-scheme-mono' ) THEN
1221	!
1222	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1223	!-- near topography, inflow- and outflow boundaries as well as bottom and
1224	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1225	!-- grid points.
1226	DO i = nxl, nxr
1227	DO j = nys, nyn
1228	DO k = nzb_s_inner(j,i)+1, nzt
1229	!
1230	!-- scalar - x-direction
1231	!-- WS1 (0), WS3 (1), WS5 (2)
1232	IF ( k <= nzb_s_inner(j,i+1) .OR. &
1233	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1234	.AND. i == nxl ) .OR. &
1235	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1236	.AND. i == nxr ) ) &
1237	THEN
1238	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1239	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1240	.OR. &
1241	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1242	.AND. i == nxr-1 ) .OR. &
1243	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1244	.AND. i == nxlu ) ) &
1245	THEN
1246	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1247	ELSE
1248	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1249	ENDIF
1250	!
1251	!-- scalar - y-direction
1252	!-- WS1 (3), WS3 (4), WS5 (5)
1253	IF ( k <= nzb_s_inner(j+1,i) .OR. &
1254	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1255	.AND. j == nys ) .OR. &
1256	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1257	.AND. j == nyn ) ) &
1258	THEN
1259	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1260	!
1261	!-- WS3
1262	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1263	.OR. &
1264	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1265	.AND. j == nysv ) .OR. &
1266	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1267	.AND. j == nyn-1 ) ) &
1268	THEN
1269	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1270	!
1271	!-- WS5
1272	ELSE
1273	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1274	ENDIF
1275	!
1276	!-- scalar - z-direction
1277	!-- WS1 (6), WS3 (7), WS5 (8)
1278	flag_set = .FALSE.
1279	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1280	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1281	flag_set = .TRUE.
1282	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1283	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1284	flag_set = .TRUE.
1285	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1286	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1287	ENDIF
1288	ENDDO
1289	ENDDO
1290	ENDDO
1291	ENDIF
1292
1293	IF ( momentum_advec == 'ws-scheme' ) THEN
1294	!
1295	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1296	!-- near topography, inflow- and outflow boundaries as well as bottom and
1297	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1298	!-- grid points.
1299	DO i = nxl, nxr
1300	DO j = nys, nyn
1301	DO k = nzb+1, nzt
1302	!
1303	!-- At first, set flags to WS1.
1304	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1305	!-- in order to handle the left/south flux.
1306	!-- near vertical walls.
1307	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1308	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1309	!
1310	!-- u component - x-direction
1311	!-- WS1 (9), WS3 (10), WS5 (11)
1312	IF ( k <= nzb_u_inner(j,i+1) .OR. &
1313	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1314	.AND. i <= nxlu ) .OR. &
1315	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1316	.AND. i == nxr ) ) &
1317	THEN
1318	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1319	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1320	.OR. &
1321	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1322	.AND. i == nxr-1 ) .OR. &
1323	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1324	.AND. i == nxlu+1) ) &
1325	THEN
1326	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1327	!
1328	!-- Clear flag for WS1
1329	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1330	ELSE
1331	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1332	!
1333	!-- Clear flag for WS1
1334	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1335	ENDIF
1336	!
1337	!-- u component - y-direction
1338	!-- WS1 (12), WS3 (13), WS5 (14)
1339	IF ( k <= nzb_u_inner(j+1,i) .OR. &
1340	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1341	.AND. j == nys ) .OR. &
1342	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1343	.AND. j == nyn ) ) &
1344	THEN
1345	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1346	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1347	.OR. &
1348	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1349	.AND. j == nysv ) .OR. &
1350	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1351	.AND. j == nyn-1 ) ) &
1352	THEN
1353	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1354	!
1355	!-- Clear flag for WS1
1356	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1357	ELSE
1358	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1359	!
1360	!-- Clear flag for WS1
1361	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1362	ENDIF
1363	!
1364	!-- u component - z-direction
1365	!-- WS1 (15), WS3 (16), WS5 (17)
1366	flag_set = .FALSE.
1367	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1368	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1369	flag_set = .TRUE.
1370	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1371	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1372	flag_set = .TRUE.
1373	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1374	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1375	ENDIF
1376
1377	ENDDO
1378	ENDDO
1379	ENDDO
1380
1381	DO i = nxl, nxr
1382	DO j = nys, nyn
1383	DO k = nzb+1, nzt
1384	!
1385	!-- At first, set flags to WS1.
1386	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1387	!-- in order to handle the left/south flux.
1388	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1389	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1390	!
1391	!-- v component - x-direction
1392	!-- WS1 (18), WS3 (19), WS5 (20)
1393	IF ( k <= nzb_v_inner(j,i+1) .OR. &
1394	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1395	.AND. i == nxl ) .OR. &
1396	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1397	.AND. i == nxr ) ) &
1398	THEN
1399	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1400	!
1401	!-- WS3
1402	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1403	.OR. &
1404	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1405	.AND. i == nxr-1 ) .OR. &
1406	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1407	.AND. i == nxlu ) ) &
1408	THEN
1409	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1410	!
1411	!-- Clear flag for WS1
1412	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1413	ELSE
1414	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1415	!
1416	!-- Clear flag for WS1
1417	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1418	ENDIF
1419	!
1420	!-- v component - y-direction
1421	!-- WS1 (21), WS3 (22), WS5 (23)
1422	IF ( k <= nzb_v_inner(j+1,i) .OR. &
1423	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1424	.AND. j <= nysv ) .OR. &
1425	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1426	.AND. j == nyn ) ) &
1427	THEN
1428	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1429	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1430	.OR. &
1431	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1432	.AND. j == nysv+1) .OR. &
1433	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1434	.AND. j == nyn-1 ) ) &
1435	THEN
1436	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1437	!
1438	!-- Clear flag for WS1
1439	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1440	ELSE
1441	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1442	!
1443	!-- Clear flag for WS1
1444	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1445	ENDIF
1446	!
1447	!-- v component - z-direction
1448	!-- WS1 (24), WS3 (25), WS5 (26)
1449	flag_set = .FALSE.
1450	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1451	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1452	flag_set = .TRUE.
1453	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1454	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1455	flag_set = .TRUE.
1456	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1457	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1458	ENDIF
1459
1460	ENDDO
1461	ENDDO
1462	ENDDO
1463	DO i = nxl, nxr
1464	DO j = nys, nyn
1465	DO k = nzb+1, nzt
1466	!
1467	!-- At first, set flags to WS1.
1468	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1469	!-- in order to handle the left/south flux.
1470	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1471	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1472	!
1473	!-- w component - x-direction
1474	!-- WS1 (27), WS3 (28), WS5 (29)
1475	IF ( k <= nzb_w_inner(j,i+1) .OR. &
1476	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1477	.AND. i == nxl ) .OR. &
1478	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1479	.AND. i == nxr ) ) &
1480	THEN
1481	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1482	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1483	.OR. &
1484	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1485	.AND. i == nxr-1 ) .OR. &
1486	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1487	.AND. i == nxlu ) ) &
1488	THEN
1489	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1490	!
1491	!-- Clear flag for WS1
1492	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1493	ELSE
1494	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1495	!
1496	!-- Clear flag for WS1
1497	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1498	ENDIF
1499	!
1500	!-- w component - y-direction
1501	!-- WS1 (30), WS3 (31), WS5 (32)
1502	IF ( k <= nzb_w_inner(j+1,i) .OR. &
1503	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1504	.AND. j == nys ) .OR. &
1505	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1506	.AND. j == nyn ) ) &
1507	THEN
1508	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1509	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1510	.OR. &
1511	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1512	.AND. j == nysv ) .OR. &
1513	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1514	.AND. j == nyn-1 ) ) &
1515	THEN
1516	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1517	!
1518	!-- Clear flag for WS1
1519	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1520	ELSE
1521	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1522	!
1523	!-- Clear flag for WS1
1524	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1525	ENDIF
1526	!
1527	!-- w component - z-direction
1528	!-- WS1 (33), WS3 (34), WS5 (35)
1529	flag_set = .FALSE.
1530	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1531	.OR. k == nzt ) THEN
1532	!
1533	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1534	!-- set, although this is not a prognostic level. However,
1535	!-- contrary to the advection of u,v and s this is necessary
1536	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1537	!-- at k == nzb_w_inner(j,i)+1.
1538	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1539	flag_set = .TRUE.
1540	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1541	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1542	flag_set = .TRUE.
1543	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1544	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1545	ENDIF
1546
1547	ENDDO
1548	ENDDO
1549	ENDDO
1550
1551	ENDIF
1552
1553	!
1554	!-- Exchange 3D integer wall_flags.
1555	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1556	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1557	!
1558	!-- Exchange ghost points for advection flags
1559	CALL exchange_horiz_int( wall_flags_0, nbgp )
1560	CALL exchange_horiz_int( wall_flags_00, nbgp )
1561	!
1562	!-- Set boundary flags at inflow and outflow boundary in case of
1563	!-- non-cyclic boundary conditions.
1564	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1565	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1566	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1567	ENDIF
1568
1569	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
1570	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1571	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1572	ENDIF
1573
1574	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
1575	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1576	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1577	ENDIF
1578
1579	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1580	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1581	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1582	ENDIF
1583
1584	ENDIF
1585
1586	!
1587	!-- In case of topography: limit near-wall mixing length l_wall further:
1588	!-- Go through all points of the subdomain one by one and look for the closest
1589	!-- surface
1590	IF ( TRIM(topography) /= 'flat' ) THEN
1591	DO i = nxl, nxr
1592	DO j = nys, nyn
1593
1594	nzb_si = nzb_s_inner(j,i)
1595	vi = vertical_influence(nzb_si)
1596
1597	IF ( wall_n(j,i) > 0 ) THEN
1598	!
1599	!-- North wall (y distance)
1600	DO k = wall_n(j,i), nzb_si
1601	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1602	ENDDO
1603	!
1604	!-- Above North wall (yz distance)
1605	DO k = nzb_si + 1, nzb_si + vi
1606	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1607	SQRT( 0.25_wp * dy**2 + &
1608	( zu(k) - zw(nzb_si) )**2 ) )
1609	ENDDO
1610	!
1611	!-- Northleft corner (xy distance)
1612	IF ( corner_nl(j,i) > 0 ) THEN
1613	DO k = corner_nl(j,i), nzb_si
1614	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1615	0.5_wp * SQRT( dx2 + dy2 ) )
1616	ENDDO
1617	!
1618	!-- Above Northleft corner (xyz distance)
1619	DO k = nzb_si + 1, nzb_si + vi
1620	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1621	SQRT( 0.25_wp * (dx2 + dy2) + &
1622	( zu(k) - zw(nzb_si) )**2 ) )
1623	ENDDO
1624	ENDIF
1625	!
1626	!-- Northright corner (xy distance)
1627	IF ( corner_nr(j,i) > 0 ) THEN
1628	DO k = corner_nr(j,i), nzb_si
1629	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1630	0.5_wp * SQRT( dx2 + dy2 ) )
1631	ENDDO
1632	!
1633	!-- Above northright corner (xyz distance)
1634	DO k = nzb_si + 1, nzb_si + vi
1635	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1636	SQRT( 0.25_wp * (dx2 + dy2) + &
1637	( zu(k) - zw(nzb_si) )**2 ) )
1638	ENDDO
1639	ENDIF
1640	ENDIF
1641
1642	IF ( wall_s(j,i) > 0 ) THEN
1643	!
1644	!-- South wall (y distance)
1645	DO k = wall_s(j,i), nzb_si
1646	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1647	ENDDO
1648	!
1649	!-- Above south wall (yz distance)
1650	DO k = nzb_si + 1, nzb_si + vi
1651	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1652	SQRT( 0.25_wp * dy**2 + &
1653	( zu(k) - zw(nzb_si) )**2 ) )
1654	ENDDO
1655	!
1656	!-- Southleft corner (xy distance)
1657	IF ( corner_sl(j,i) > 0 ) THEN
1658	DO k = corner_sl(j,i), nzb_si
1659	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1660	0.5_wp * SQRT( dx2 + dy2 ) )
1661	ENDDO
1662	!
1663	!-- Above southleft corner (xyz distance)
1664	DO k = nzb_si + 1, nzb_si + vi
1665	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1666	SQRT( 0.25_wp * (dx2 + dy2) + &
1667	( zu(k) - zw(nzb_si) )**2 ) )
1668	ENDDO
1669	ENDIF
1670	!
1671	!-- Southright corner (xy distance)
1672	IF ( corner_sr(j,i) > 0 ) THEN
1673	DO k = corner_sr(j,i), nzb_si
1674	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1675	0.5_wp * SQRT( dx2 + dy2 ) )
1676	ENDDO
1677	!
1678	!-- Above southright corner (xyz distance)
1679	DO k = nzb_si + 1, nzb_si + vi
1680	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1681	SQRT( 0.25_wp * (dx2 + dy2) + &
1682	( zu(k) - zw(nzb_si) )**2 ) )
1683	ENDDO
1684	ENDIF
1685
1686	ENDIF
1687
1688	IF ( wall_l(j,i) > 0 ) THEN
1689	!
1690	!-- Left wall (x distance)
1691	DO k = wall_l(j,i), nzb_si
1692	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1693	ENDDO
1694	!
1695	!-- Above left wall (xz distance)
1696	DO k = nzb_si + 1, nzb_si + vi
1697	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1698	SQRT( 0.25_wp * dx**2 + &
1699	( zu(k) - zw(nzb_si) )**2 ) )
1700	ENDDO
1701	ENDIF
1702
1703	IF ( wall_r(j,i) > 0 ) THEN
1704	!
1705	!-- Right wall (x distance)
1706	DO k = wall_r(j,i), nzb_si
1707	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1708	ENDDO
1709	!
1710	!-- Above right wall (xz distance)
1711	DO k = nzb_si + 1, nzb_si + vi
1712	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1713	SQRT( 0.25_wp * dx**2 + &
1714	( zu(k) - zw(nzb_si) )**2 ) )
1715	ENDDO
1716
1717	ENDIF
1718
1719	ENDDO
1720	ENDDO
1721
1722	ENDIF
1723
1724	!
1725	!-- Multiplication with wall_adjustment_factor
1726	l_wall = wall_adjustment_factor * l_wall
1727
1728	!
1729	!-- Set lateral boundary conditions for l_wall
1730	CALL exchange_horiz( l_wall, nbgp )
1731
1732	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1733	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1734
1735	#endif
1736
1737	END SUBROUTINE init_grid

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

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |