Home

Context Navigation

source: palm/trunk/SOURCE/init_grid.f90 @ 1763

Last change on this file since 1763 was 1763, checked in by hellstea, 8 years ago
last commit documented
Property svn:keywords set to `Id`
File size: 69.0 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	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_grid.f90 1763 2016-02-25 13:00:19Z hellstea $
26	!
27	! 1762 2016-02-25 12:31:13Z hellstea
28	! Introduction of nested domain feature
29	!
30	! 1743 2016-01-13 10:23:51Z raasch
31	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
32	! total domain
33	!
34	! 1691 2015-10-26 16:17:44Z maronga
35	! Renamed prandtl_layer to constant_flux_layer.
36	!
37	! 1682 2015-10-07 23:56:08Z knoop
38	! Code annotations made doxygen readable
39	!
40	! 1677 2015-10-02 13:25:23Z boeske
41	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
42	!
43	! 1675 2015-10-02 08:28:59Z gronemeier
44	! Bugfix: Definition of topography grid levels
45	!
46	! 1660 2015-09-21 08:15:16Z gronemeier
47	! Bugfix: Definition of topography grid levels if vertical grid stretching
48	! starts below the maximum topography height.
49	!
50	! 1580 2015-04-10 13:43:49Z suehring
51	! Bugfix: setting flags for 5th order scheme near buildings
52	!
53	! 1575 2015-03-27 09:56:27Z raasch
54	! adjustments for psolver-queries
55	!
56	! 1557 2015-03-05 16:43:04Z suehring
57	! Adjustment for monotoinic limiter
58	!
59	! 1418 2014-06-06 13:05:08Z fricke
60	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
61	! condition and a negative value for dz_stretch_level the condition
62	! was always true for the whole model domain
63	!
64	! 1409 2014-05-23 12:11:32Z suehring
65	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
66	! j <= nysv
67	!
68	! 1353 2014-04-08 15:21:23Z heinze
69	! REAL constants provided with KIND-attribute
70	!
71	! 1322 2014-03-20 16:38:49Z raasch
72	! REAL constants defined as wp-kind
73	!
74	! 1320 2014-03-20 08:40:49Z raasch
75	! ONLY-attribute added to USE-statements,
76	! kind-parameters added to all INTEGER and REAL declaration statements,
77	! kinds are defined in new module kinds,
78	! revision history before 2012 removed,
79	! comment fields (!:) to be used for variable explanations added to
80	! all variable declaration statements
81	!
82	! 1221 2013-09-10 08:59:13Z raasch
83	! wall_flags_00 introduced to hold bits 32-63,
84	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
85	! loops optimized for openACC (pres + flow_statistics)
86	!
87	! 1092 2013-02-02 11:24:22Z raasch
88	! unused variables removed
89	!
90	! 1069 2012-11-28 16:18:43Z maronga
91	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
92	! model in case of coupled runs
93	!
94	! 1036 2012-10-22 13:43:42Z raasch
95	! code put under GPL (PALM 3.9)
96	!
97	! 1015 2012-09-27 09:23:24Z raasch
98	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
99	! nzb_w_inner+1
100	!
101	! 996 2012-09-07 10:41:47Z raasch
102	! little reformatting
103	!
104	! 978 2012-08-09 08:28:32Z fricke
105	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
106	! Bugfix: Set wall_flags_0 for inflow boundary
107	!
108	! 927 2012-06-06 19:15:04Z raasch
109	! Wall flags are not set for multigrid method in case of masking method
110	!
111	! 864 2012-03-27 15:10:33Z gryschka
112	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
113	! were not correctly defined for k=1.
114	!
115	! 861 2012-03-26 14:18:34Z suehring
116	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
117	! inflow and outflow boundaries as well as near the bottom and the top of the
118	! model domain.!
119	! Initialization of nzb_s_inner and nzb_w_inner.
120	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
121	! while setting wall_flags_0
122	!
123	! 843 2012-02-29 15:16:21Z gryschka
124	! In case of ocean and dirichlet bc for u and v at the bottom
125	! the first u-level ist defined at same height as the first w-level
126	!
127	! 818 2012-02-08 16:11:23Z maronga
128	! Bugfix: topo_height is only required if topography is used. It is thus now
129	! allocated in the topography branch
130	!
131	! 809 2012-01-30 13:32:58Z maronga
132	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
133	!
134	! 807 2012-01-25 11:53:51Z maronga
135	! New cpp directive "__check" implemented which is used by check_namelist_files
136	!
137	! Revision 1.1 1997/08/11 06:17:45 raasch
138	! Initial revision (Testversion)
139	!
140	!
141	! Description:
142	! ------------
143	!> Creating grid depending constants
144	!------------------------------------------------------------------------------!
145	SUBROUTINE init_grid
146
147
148	USE arrays_3d, &
149	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
150	f2_mg, f3_mg, l_grid, l_wall, zu, zw
151
152	USE control_parameters, &
153	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
154	building_length_y, building_wall_left, building_wall_south, &
155	canyon_height, canyon_wall_left, canyon_wall_south, &
156	canyon_width_x, canyon_width_y, constant_flux_layer, &
157	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
158	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
159	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
160	masking_method, maximum_grid_level, message_string, &
161	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
162	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
163	outflow_r, outflow_s, psolver, scalar_advec, topography, &
164	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
165	wall_adjustment_factor
166
167	USE grid_variables, &
168	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
169	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
170	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
171
172	USE indices, &
173	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
174	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
175	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
176	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
177	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
178	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
179	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
180	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
181	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
182	wall_flags_9
183
184	USE kinds
185
186	USE pegrid
187
188	IMPLICIT NONE
189
190	INTEGER(iwp) :: bh !<
191	INTEGER(iwp) :: blx !<
192	INTEGER(iwp) :: bly !<
193	INTEGER(iwp) :: bxl !<
194	INTEGER(iwp) :: bxr !<
195	INTEGER(iwp) :: byn !<
196	INTEGER(iwp) :: bys !<
197	INTEGER(iwp) :: ch !<
198	INTEGER(iwp) :: cwx !<
199	INTEGER(iwp) :: cwy !<
200	INTEGER(iwp) :: cxl !<
201	INTEGER(iwp) :: cxr !<
202	INTEGER(iwp) :: cyn !<
203	INTEGER(iwp) :: cys !<
204	INTEGER(iwp) :: gls !<
205	INTEGER(iwp) :: i !<
206	INTEGER(iwp) :: ii !<
207	INTEGER(iwp) :: inc !<
208	INTEGER(iwp) :: j !<
209	INTEGER(iwp) :: k !<
210	INTEGER(iwp) :: l !<
211	INTEGER(iwp) :: nxl_l !<
212	INTEGER(iwp) :: nxr_l !<
213	INTEGER(iwp) :: nyn_l !<
214	INTEGER(iwp) :: nys_l !<
215	INTEGER(iwp) :: nzb_si !<
216	INTEGER(iwp) :: nzt_l !<
217	INTEGER(iwp) :: vi !<
218
219	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
220
221	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
222	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
223	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
224	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
225	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
226	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
227	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
228	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
229	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
230	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
231
232	LOGICAL :: flag_set = .FALSE. !<
233
234	REAL(wp) :: dx_l !<
235	REAL(wp) :: dy_l !<
236	REAL(wp) :: dz_stretched !<
237
238	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
239
240
241	!
242	!-- Calculation of horizontal array bounds including ghost layers
243	nxlg = nxl - nbgp
244	nxrg = nxr + nbgp
245	nysg = nys - nbgp
246	nyng = nyn + nbgp
247
248	!
249	!-- Allocate grid arrays
250	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
251	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
252
253	!
254	!-- Compute height of u-levels from constant grid length and dz stretch factors
255	IF ( dz == -1.0_wp ) THEN
256	message_string = 'missing dz'
257	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
258	ELSEIF ( dz <= 0.0_wp ) THEN
259	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
260	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
261	ENDIF
262
263	!
264	!-- Define the vertical grid levels
265	IF ( .NOT. ocean ) THEN
266	!
267	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
268	!-- The second u-level (k=1) corresponds to the top of the
269	!-- Prandtl-layer.
270
271	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
272	zu(0) = 0.0_wp
273	! zu(0) = - dz * 0.5_wp
274	ELSE
275	zu(0) = - dz * 0.5_wp
276	ENDIF
277	zu(1) = dz * 0.5_wp
278
279	dz_stretch_level_index = nzt+1
280	dz_stretched = dz
281	DO k = 2, nzt+1
282	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
283	dz_stretched = dz_stretched * dz_stretch_factor
284	dz_stretched = MIN( dz_stretched, dz_max )
285	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
286	ENDIF
287	zu(k) = zu(k-1) + dz_stretched
288	ENDDO
289
290	!
291	!-- Compute the w-levels. They are always staggered half-way between the
292	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
293	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
294	!-- The top w-level is extrapolated linearly.
295	zw(0) = 0.0_wp
296	DO k = 1, nzt
297	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
298	ENDDO
299	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
300
301	ELSE
302	!
303	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
304	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
305	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
306	!-- w-level are defined at same height, but staggered from the second level.
307	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
308	zu(nzt+1) = dz * 0.5_wp
309	zu(nzt) = - dz * 0.5_wp
310
311	dz_stretch_level_index = 0
312	dz_stretched = dz
313	DO k = nzt-1, 0, -1
314	!
315	!-- The default value of dz_stretch_level is positive, thus the first
316	!-- condition is always true. Hence, the second condition is necessary.
317	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
318	.AND. dz_stretched < dz_max ) THEN
319	dz_stretched = dz_stretched * dz_stretch_factor
320	dz_stretched = MIN( dz_stretched, dz_max )
321	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
322	ENDIF
323	zu(k) = zu(k+1) - dz_stretched
324	ENDDO
325
326	!
327	!-- Compute the w-levels. They are always staggered half-way between the
328	!-- corresponding u-levels, except in case of dirichlet bc for u and v
329	!-- at the ground. In this case the first u- and w-level are defined at
330	!-- same height. The top w-level (nzt+1) is not used but set for
331	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
332	zw(nzt+1) = dz
333	zw(nzt) = 0.0_wp
334	DO k = 0, nzt
335	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
336	ENDDO
337
338	!
339	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
340	!-- at same height.
341	IF ( ibc_uv_b == 0 ) THEN
342	zu(0) = zw(0)
343	ENDIF
344
345	ENDIF
346
347	!
348	!-- Compute grid lengths.
349	DO k = 1, nzt+1
350	dzu(k) = zu(k) - zu(k-1)
351	ddzu(k) = 1.0_wp / dzu(k)
352	dzw(k) = zw(k) - zw(k-1)
353	ddzw(k) = 1.0_wp / dzw(k)
354	ENDDO
355
356	DO k = 1, nzt
357	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
358	ENDDO
359
360	!
361	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
362	!-- everywhere. For the actual grid, the grid spacing at the lowest level
363	!-- is only dz/2, but should be dz. Therefore, an additional array
364	!-- containing with appropriate grid information is created for these
365	!-- solvers.
366	IF ( psolver(1:9) /= 'multigrid' ) THEN
367	ALLOCATE( ddzu_pres(1:nzt+1) )
368	ddzu_pres = ddzu
369	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
370	ENDIF
371
372	!
373	!-- In case of multigrid method, compute grid lengths and grid factors for the
374	!-- grid levels
375	IF ( psolver(1:9) == 'multigrid' ) THEN
376
377	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
378	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
379	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
380	f1_mg(nzb+1:nzt,maximum_grid_level), &
381	f2_mg(nzb+1:nzt,maximum_grid_level), &
382	f3_mg(nzb+1:nzt,maximum_grid_level) )
383
384	dzu_mg(:,maximum_grid_level) = dzu
385	!
386	!-- Next line to ensure an equally spaced grid.
387	dzu_mg(1,maximum_grid_level) = dzu(2)
388
389	dzw_mg(:,maximum_grid_level) = dzw
390	nzt_l = nzt
391	DO l = maximum_grid_level-1, 1, -1
392	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
393	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
394	nzt_l = nzt_l / 2
395	DO k = 2, nzt_l+1
396	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
397	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
398	ENDDO
399	ENDDO
400
401	nzt_l = nzt
402	dx_l = dx
403	dy_l = dy
404	DO l = maximum_grid_level, 1, -1
405	ddx2_mg(l) = 1.0_wp / dx_l**2
406	ddy2_mg(l) = 1.0_wp / dy_l**2
407	DO k = nzb+1, nzt_l
408	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
409	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
410	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
411	f2_mg(k,l) + f3_mg(k,l)
412	ENDDO
413	nzt_l = nzt_l / 2
414	dx_l = dx_l * 2.0_wp
415	dy_l = dy_l * 2.0_wp
416	ENDDO
417
418	ENDIF
419
420	!
421	!-- Compute the reciprocal values of the horizontal grid lengths.
422	ddx = 1.0_wp / dx
423	ddy = 1.0_wp / dy
424	dx2 = dx * dx
425	dy2 = dy * dy
426	ddx2 = 1.0_wp / dx2
427	ddy2 = 1.0_wp / dy2
428
429	!
430	!-- Compute the grid-dependent mixing length.
431	DO k = 1, nzt
432	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
433	ENDDO
434
435	!
436	!-- Allocate outer and inner index arrays for topography and set
437	!-- defaults.
438	!-- nzb_local has to contain additional layers of ghost points for calculating
439	!-- the flag arrays needed for the multigrid method
440	gls = 2**( maximum_grid_level )
441	IF ( gls < nbgp ) gls = nbgp
442
443	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
444	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
445	nzb_local(-gls:ny+gls,-gls:nx+gls), &
446	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
447	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
448	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
449	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
450	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
451	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
452	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
453	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
454	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
455	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
456	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
457	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
458	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
459	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
460	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
461	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
462	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
463	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
464	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
465	nzb_2d(nysg:nyng,nxlg:nxrg), &
466	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
467	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
468	wall_e_x(nysg:nyng,nxlg:nxrg), &
469	wall_e_y(nysg:nyng,nxlg:nxrg), &
470	wall_u(nysg:nyng,nxlg:nxrg), &
471	wall_v(nysg:nyng,nxlg:nxrg), &
472	wall_w_x(nysg:nyng,nxlg:nxrg), &
473	wall_w_y(nysg:nyng,nxlg:nxrg) )
474
475
476
477	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
478
479
480	nzb_s_inner = nzb; nzb_s_outer = nzb
481	nzb_u_inner = nzb; nzb_u_outer = nzb
482	nzb_v_inner = nzb; nzb_v_outer = nzb
483	nzb_w_inner = nzb; nzb_w_outer = nzb
484
485	rflags_s_inner = 1.0_wp
486	rflags_invers = 1.0_wp
487
488	!
489	!-- Define vertical gridpoint from (or to) which on the usual finite difference
490	!-- form (which does not use surface fluxes) is applied
491	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
492	nzb_diff = nzb + 2
493	ELSE
494	nzb_diff = nzb + 1
495	ENDIF
496	IF ( use_top_fluxes ) THEN
497	nzt_diff = nzt - 1
498	ELSE
499	nzt_diff = nzt
500	ENDIF
501
502	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
503	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
504
505	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
506	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
507	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
508	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
509
510	!
511	!-- Initialize near-wall mixing length l_wall only in the vertical direction
512	!-- for the moment,
513	!-- multiplication with wall_adjustment_factor near the end of this routine
514	l_wall(nzb,:,:) = l_grid(1)
515	DO k = nzb+1, nzt
516	l_wall(k,:,:) = l_grid(k)
517	ENDDO
518	l_wall(nzt+1,:,:) = l_grid(nzt)
519
520	ALLOCATE ( vertical_influence(nzb:nzt) )
521	DO k = 1, nzt
522	vertical_influence(k) = MIN ( INT( l_grid(k) / &
523	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
524	ENDDO
525
526	DO k = 1, MAXVAL( nzb_s_inner )
527	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
528	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
529	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
530	'threshold given by only local', &
531	' &horizontal reduction of near_wall ', &
532	'mixing length l_wall', &
533	' &starting from height level k = ', k, '.'
534	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
535	EXIT
536	ENDIF
537	ENDDO
538	vertical_influence(0) = vertical_influence(1)
539
540	DO i = nxlg, nxrg
541	DO j = nysg, nyng
542	DO k = nzb_s_inner(j,i) + 1, &
543	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
544	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
545	ENDDO
546	ENDDO
547	ENDDO
548
549	!
550	!-- Set outer and inner index arrays for non-flat topography.
551	!-- Here consistency checks concerning domain size and periodicity are
552	!-- necessary.
553	!-- Within this SELECT CASE structure only nzb_local is initialized
554	!-- individually depending on the chosen topography type, all other index
555	!-- arrays are initialized further below.
556	SELECT CASE ( TRIM( topography ) )
557
558	CASE ( 'flat' )
559	!
560	!-- nzb_local is required for the multigrid solver
561	nzb_local = 0
562
563	CASE ( 'single_building' )
564	!
565	!-- Single rectangular building, by default centered in the middle of the
566	!-- total domain
567	blx = NINT( building_length_x / dx )
568	bly = NINT( building_length_y / dy )
569	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
570	IF ( ABS( zw(bh ) - building_height ) == &
571	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
572
573	IF ( building_wall_left == 9999999.9_wp ) THEN
574	building_wall_left = ( nx + 1 - blx ) / 2 * dx
575	ENDIF
576	bxl = NINT( building_wall_left / dx )
577	bxr = bxl + blx
578
579	IF ( building_wall_south == 9999999.9_wp ) THEN
580	building_wall_south = ( ny + 1 - bly ) / 2 * dy
581	ENDIF
582	bys = NINT( building_wall_south / dy )
583	byn = bys + bly
584
585	!
586	!-- Building size has to meet some requirements
587	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
588	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
589	WRITE( message_string, * ) 'inconsistent building parameters:', &
590	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
591	'byn=', byn, 'nx=', nx, 'ny=', ny
592	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
593	ENDIF
594
595	!
596	!-- Define the building.
597	nzb_local = 0
598	nzb_local(bys:byn,bxl:bxr) = bh
599
600	CASE ( 'single_street_canyon' )
601	!
602	!-- Single quasi-2D street canyon of infinite length in x or y direction.
603	!-- The canyon is centered in the other direction by default.
604	IF ( canyon_width_x /= 9999999.9_wp ) THEN
605	!
606	!-- Street canyon in y direction
607	cwx = NINT( canyon_width_x / dx )
608	IF ( canyon_wall_left == 9999999.9_wp ) THEN
609	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
610	ENDIF
611	cxl = NINT( canyon_wall_left / dx )
612	cxr = cxl + cwx
613
614	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
615	!
616	!-- Street canyon in x direction
617	cwy = NINT( canyon_width_y / dy )
618	IF ( canyon_wall_south == 9999999.9_wp ) THEN
619	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
620	ENDIF
621	cys = NINT( canyon_wall_south / dy )
622	cyn = cys + cwy
623
624	ELSE
625
626	message_string = 'no street canyon width given'
627	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
628
629	ENDIF
630
631	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
632	IF ( ABS( zw(ch ) - canyon_height ) == &
633	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
634
635	dp_level_ind_b = ch
636	!
637	!-- Street canyon size has to meet some requirements
638	IF ( canyon_width_x /= 9999999.9_wp ) THEN
639	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
640	( ch < 3 ) ) THEN
641	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
642	'&cxl=', cxl, 'cxr=', cxr, &
643	'cwx=', cwx, &
644	'ch=', ch, 'nx=', nx, 'ny=', ny
645	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
646	ENDIF
647	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
648	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
649	( ch < 3 ) ) THEN
650	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
651	'&cys=', cys, 'cyn=', cyn, &
652	'cwy=', cwy, &
653	'ch=', ch, 'nx=', nx, 'ny=', ny
654	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
655	ENDIF
656	ENDIF
657	IF ( canyon_width_x /= 9999999.9_wp .AND. &
658	canyon_width_y /= 9999999.9_wp ) THEN
659	message_string = 'inconsistent canyon parameters:' // &
660	'&street canyon can only be oriented' // &
661	'&either in x- or in y-direction'
662	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
663	ENDIF
664
665	nzb_local = ch
666	IF ( canyon_width_x /= 9999999.9_wp ) THEN
667	nzb_local(:,cxl+1:cxr-1) = 0
668	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
669	nzb_local(cys+1:cyn-1,:) = 0
670	ENDIF
671
672	CASE ( 'read_from_file' )
673
674	ALLOCATE ( topo_height(0:ny,0:nx) )
675
676	DO ii = 0, io_blocks-1
677	IF ( ii == io_group ) THEN
678
679	!
680	!-- Arbitrary irregular topography data in PALM format (exactly
681	!-- matching the grid size and total domain size)
682	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
683	FORM='FORMATTED', ERR=10 )
684	DO j = ny, 0, -1
685	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
686	ENDDO
687
688	GOTO 12
689
690	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
691	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
692
693	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
694	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
695
696	12 CLOSE( 90 )
697
698	ENDIF
699	#if defined( __parallel ) && ! defined ( __check )
700	CALL MPI_BARRIER( comm2d, ierr )
701	#endif
702	ENDDO
703
704	!
705	!-- Calculate the index height of the topography
706	DO i = 0, nx
707	DO j = 0, ny
708	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
709	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
710	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
711	nzb_local(j,i) = nzb_local(j,i) + 1
712	ENDDO
713	ENDDO
714
715	DEALLOCATE ( topo_height )
716	!
717	!-- Add cyclic boundaries (additional layers are for calculating
718	!-- flag arrays needed for the multigrid sover)
719	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
720	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
721	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
722	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
723
724	CASE DEFAULT
725	!
726	!-- The DEFAULT case is reached either if the parameter topography
727	!-- contains a wrong character string or if the user has defined a special
728	!-- case in the user interface. There, the subroutine user_init_grid
729	!-- checks which of these two conditions applies.
730	CALL user_init_grid( gls, nzb_local )
731
732	END SELECT
733	!
734	!-- Determine the maximum level of topography. Furthermore it is used for
735	!-- steering the degradation of order of the applied advection scheme.
736	!-- In case of non-cyclic lateral boundaries, the order of the advection
737	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
738	nzb_max = MAXVAL( nzb_local ) + 1
739	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
740	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
741	nest_domain ) &
742	THEN
743	nzb_max = nzt
744	ENDIF
745
746	!
747	!-- Consistency checks and index array initialization are only required for
748	!-- non-flat topography, also the initialization of topography height arrays
749	!-- zu_s_inner and zw_w_inner
750	IF ( TRIM( topography ) /= 'flat' ) THEN
751
752	!
753	!-- Consistency checks
754	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
755	WRITE( message_string, * ) 'nzb_local values are outside the', &
756	'model domain', &
757	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
758	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
759	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
760	ENDIF
761
762	IF ( bc_lr == 'cyclic' ) THEN
763	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
764	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
765	message_string = 'nzb_local does not fulfill cyclic' // &
766	' boundary condition in x-direction'
767	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
768	ENDIF
769	ENDIF
770	IF ( bc_ns == 'cyclic' ) THEN
771	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
772	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
773	message_string = 'nzb_local does not fulfill cyclic' // &
774	' boundary condition in y-direction'
775	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
776	ENDIF
777	ENDIF
778
779	IF ( topography_grid_convention == 'cell_edge' ) THEN
780	!
781	!-- The array nzb_local as defined using the 'cell_edge' convention
782	!-- describes the actual total size of topography which is defined at the
783	!-- cell edges where u=0 on the topography walls in x-direction and v=0
784	!-- on the topography walls in y-direction. However, PALM uses individual
785	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
786	!-- Therefore, the extent of topography in nzb_local is now reduced by
787	!-- 1dx at the E topography walls and by 1dy at the N topography walls
788	!-- to form the basis for nzb_s_inner.
789	DO j = -gls, ny + gls
790	DO i = -gls, nx
791	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
792	ENDDO
793	ENDDO
794	!-- apply cyclic boundary conditions in x-direction
795	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
796	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
797	DO i = -gls, nx + gls
798	DO j = -gls, ny
799	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
800	ENDDO
801	ENDDO
802	!-- apply cyclic boundary conditions in y-direction
803	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
804	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
805	ENDIF
806
807	!
808	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
809	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
810	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
811
812	!
813	!-- Initialize remaining index arrays:
814	!-- first pre-initialize them with nzb_s_inner...
815	nzb_u_inner = nzb_s_inner
816	nzb_u_outer = nzb_s_inner
817	nzb_v_inner = nzb_s_inner
818	nzb_v_outer = nzb_s_inner
819	nzb_w_outer = nzb_s_inner
820	nzb_s_outer = nzb_s_inner
821
822	!
823	!-- ...then extend pre-initialized arrays in their according directions
824	!-- based on nzb_local using nzb_tmp as a temporary global index array
825
826	!
827	!-- nzb_s_outer:
828	!-- extend nzb_local east-/westwards first, then north-/southwards
829	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
830	DO j = -1, ny + 1
831	DO i = 0, nx
832	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
833	nzb_local(j,i+1) )
834	ENDDO
835	ENDDO
836	DO i = nxl, nxr
837	DO j = nys, nyn
838	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
839	nzb_tmp(j+1,i) )
840	ENDDO
841	!
842	!-- non-cyclic boundary conditions (overwritten by call of
843	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
844	IF ( nys == 0 ) THEN
845	j = -1
846	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
847	ENDIF
848	IF ( nyn == ny ) THEN
849	j = ny + 1
850	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
851	ENDIF
852	ENDDO
853	!
854	!-- nzb_w_outer:
855	!-- identical to nzb_s_outer
856	nzb_w_outer = nzb_s_outer
857
858	!
859	!-- nzb_u_inner:
860	!-- extend nzb_local rightwards only
861	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
862	DO j = -1, ny + 1
863	DO i = 0, nx + 1
864	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
865	ENDDO
866	ENDDO
867	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
868
869	!
870	!-- nzb_u_outer:
871	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
872	DO i = nxl, nxr
873	DO j = nys, nyn
874	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
875	nzb_tmp(j+1,i) )
876	ENDDO
877	!
878	!-- non-cyclic boundary conditions (overwritten by call of
879	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
880	IF ( nys == 0 ) THEN
881	j = -1
882	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
883	ENDIF
884	IF ( nyn == ny ) THEN
885	j = ny + 1
886	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
887	ENDIF
888	ENDDO
889
890	!
891	!-- nzb_v_inner:
892	!-- extend nzb_local northwards only
893	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
894	DO i = -1, nx + 1
895	DO j = 0, ny + 1
896	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
897	ENDDO
898	ENDDO
899	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
900
901	!
902	!-- nzb_v_outer:
903	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
904	DO j = nys, nyn
905	DO i = nxl, nxr
906	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
907	nzb_tmp(j,i+1) )
908	ENDDO
909	!
910	!-- non-cyclic boundary conditions (overwritten by call of
911	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
912	IF ( nxl == 0 ) THEN
913	i = -1
914	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
915	ENDIF
916	IF ( nxr == nx ) THEN
917	i = nx + 1
918	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
919	ENDIF
920	ENDDO
921	#if ! defined ( __check )
922	!
923	!-- Exchange of lateral boundary values (parallel computers) and cyclic
924	!-- boundary conditions, if applicable.
925	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
926	!-- they do not require exchange and are not included here.
927	CALL exchange_horiz_2d_int( nzb_u_inner )
928	CALL exchange_horiz_2d_int( nzb_u_outer )
929	CALL exchange_horiz_2d_int( nzb_v_inner )
930	CALL exchange_horiz_2d_int( nzb_v_outer )
931	CALL exchange_horiz_2d_int( nzb_w_outer )
932	CALL exchange_horiz_2d_int( nzb_s_outer )
933
934	!
935	!-- Allocate and set the arrays containing the topography height
936	IF ( myid == 0 ) THEN
937
938	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
939
940	DO i = 0, nx + 1
941	DO j = 0, ny + 1
942	zu_s_inner(i,j) = zu(nzb_local(j,i))
943	zw_w_inner(i,j) = zw(nzb_local(j,i))
944	ENDDO
945	ENDDO
946
947	ENDIF
948	!
949	!-- Set flag arrays to be used for masking of grid points
950	DO i = nxlg, nxrg
951	DO j = nysg, nyng
952	DO k = nzb, nzt+1
953	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
954	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
955	ENDDO
956	ENDDO
957	ENDDO
958	#endif
959	ENDIF
960
961	#if ! defined ( __check )
962	!
963	!-- Preliminary: to be removed after completion of the topography code!
964	!-- Set the former default k index arrays nzb_2d
965	nzb_2d = nzb
966
967	!
968	!-- Set the individual index arrays which define the k index from which on
969	!-- the usual finite difference form (which does not use surface fluxes) is
970	!-- applied
971	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
972	nzb_diff_u = nzb_u_inner + 2
973	nzb_diff_v = nzb_v_inner + 2
974	nzb_diff_s_inner = nzb_s_inner + 2
975	nzb_diff_s_outer = nzb_s_outer + 2
976	ELSE
977	nzb_diff_u = nzb_u_inner + 1
978	nzb_diff_v = nzb_v_inner + 1
979	nzb_diff_s_inner = nzb_s_inner + 1
980	nzb_diff_s_outer = nzb_s_outer + 1
981	ENDIF
982
983	!
984	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
985	!-- for limitation of near-wall mixing length l_wall further below
986	corner_nl = 0
987	corner_nr = 0
988	corner_sl = 0
989	corner_sr = 0
990	wall_l = 0
991	wall_n = 0
992	wall_r = 0
993	wall_s = 0
994
995	DO i = nxl, nxr
996	DO j = nys, nyn
997	!
998	!-- u-component
999	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
1000	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1001	fym(j,i) = 0.0_wp
1002	fyp(j,i) = 1.0_wp
1003	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
1004	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
1005	fym(j,i) = 1.0_wp
1006	fyp(j,i) = 0.0_wp
1007	ENDIF
1008	!
1009	!-- v-component
1010	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1011	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1012	fxm(j,i) = 0.0_wp
1013	fxp(j,i) = 1.0_wp
1014	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1015	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1016	fxm(j,i) = 1.0_wp
1017	fxp(j,i) = 0.0_wp
1018	ENDIF
1019	!
1020	!-- w-component, also used for scalars, separate arrays for shear
1021	!-- production of tke
1022	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1023	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1024	wall_w_y(j,i) = 1.0_wp
1025	fwym(j,i) = 0.0_wp
1026	fwyp(j,i) = 1.0_wp
1027	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1028	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1029	wall_w_y(j,i) = 1.0_wp
1030	fwym(j,i) = 1.0_wp
1031	fwyp(j,i) = 0.0_wp
1032	ENDIF
1033	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1034	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1035	wall_w_x(j,i) = 1.0_wp
1036	fwxm(j,i) = 0.0_wp
1037	fwxp(j,i) = 1.0_wp
1038	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1039	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1040	wall_w_x(j,i) = 1.0_wp
1041	fwxm(j,i) = 1.0_wp
1042	fwxp(j,i) = 0.0_wp
1043	ENDIF
1044	!
1045	!-- Wall and corner locations inside buildings for limitation of
1046	!-- near-wall mixing length l_wall
1047	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1048
1049	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1050
1051	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1052	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1053	nzb_s_inner(j,i-1) ) + 1
1054	ENDIF
1055
1056	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1057	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1058	nzb_s_inner(j,i+1) ) + 1
1059	ENDIF
1060
1061	ENDIF
1062
1063	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1064
1065	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1066	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1067	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1068	nzb_s_inner(j,i-1) ) + 1
1069	ENDIF
1070
1071	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1072	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1073	nzb_s_inner(j,i+1) ) + 1
1074	ENDIF
1075
1076	ENDIF
1077
1078	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1079	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1080	ENDIF
1081
1082	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1083	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1084	ENDIF
1085
1086	ENDDO
1087	ENDDO
1088
1089	!
1090	!-- Calculate wall flag arrays for the multigrid method
1091	IF ( psolver(1:9) == 'multigrid' ) THEN
1092	!
1093	!-- Gridpoint increment of the current level
1094	inc = 1
1095
1096	DO l = maximum_grid_level, 1 , -1
1097
1098	nxl_l = nxl_mg(l)
1099	nxr_l = nxr_mg(l)
1100	nys_l = nys_mg(l)
1101	nyn_l = nyn_mg(l)
1102	nzt_l = nzt_mg(l)
1103
1104	!
1105	!-- Assign the flag level to be calculated
1106	SELECT CASE ( l )
1107	CASE ( 1 )
1108	flags => wall_flags_1
1109	CASE ( 2 )
1110	flags => wall_flags_2
1111	CASE ( 3 )
1112	flags => wall_flags_3
1113	CASE ( 4 )
1114	flags => wall_flags_4
1115	CASE ( 5 )
1116	flags => wall_flags_5
1117	CASE ( 6 )
1118	flags => wall_flags_6
1119	CASE ( 7 )
1120	flags => wall_flags_7
1121	CASE ( 8 )
1122	flags => wall_flags_8
1123	CASE ( 9 )
1124	flags => wall_flags_9
1125	CASE ( 10 )
1126	flags => wall_flags_10
1127	END SELECT
1128
1129	!
1130	!-- Depending on the grid level, set the respective bits in case of
1131	!-- neighbouring walls
1132	!-- Bit 0: wall to the bottom
1133	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1134	!-- Bit 2: wall to the south
1135	!-- Bit 3: wall to the north
1136	!-- Bit 4: wall to the left
1137	!-- Bit 5: wall to the right
1138	!-- Bit 6: inside building
1139
1140	flags = 0
1141
1142	!
1143	!-- In case of masking method, flags are not set and multigrid method
1144	!-- works like FFT-solver
1145	IF ( .NOT. masking_method ) THEN
1146
1147	DO i = nxl_l-1, nxr_l+1
1148	DO j = nys_l-1, nyn_l+1
1149	DO k = nzb, nzt_l+1
1150
1151	!
1152	!-- Inside/outside building (inside building does not need
1153	!-- further tests for walls)
1154	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1155
1156	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1157
1158	ELSE
1159	!
1160	!-- Bottom wall
1161	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1162	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1163	ENDIF
1164	!
1165	!-- South wall
1166	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1167	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1168	ENDIF
1169	!
1170	!-- North wall
1171	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1172	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1173	ENDIF
1174	!
1175	!-- Left wall
1176	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1177	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1178	ENDIF
1179	!
1180	!-- Right wall
1181	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1182	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1183	ENDIF
1184
1185	ENDIF
1186
1187	ENDDO
1188	ENDDO
1189	ENDDO
1190
1191	ENDIF
1192
1193	!
1194	!-- Test output of flag arrays
1195	! i = nxl_l
1196	! WRITE (9,*) ' '
1197	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1198	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1199	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1200	! DO k = nzt_l+1, nzb, -1
1201	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1202	! ENDDO
1203
1204	inc = inc * 2
1205
1206	ENDDO
1207
1208	ENDIF
1209	!
1210	!-- Allocate flags needed for masking walls.
1211	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1212	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1213	wall_flags_0 = 0
1214	wall_flags_00 = 0
1215
1216	IF ( scalar_advec == 'ws-scheme' .OR. &
1217	scalar_advec == 'ws-scheme-mono' ) THEN
1218	!
1219	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1220	!-- near topography, inflow- and outflow boundaries as well as bottom and
1221	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1222	!-- grid points.
1223	DO i = nxl, nxr
1224	DO j = nys, nyn
1225	DO k = nzb_s_inner(j,i)+1, nzt
1226	!
1227	!-- scalar - x-direction
1228	!-- WS1 (0), WS3 (1), WS5 (2)
1229	IF ( k <= nzb_s_inner(j,i+1) .OR. &
1230	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1231	.AND. i == nxl ) .OR. &
1232	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1233	.AND. i == nxr ) ) &
1234	THEN
1235	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1236	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1237	.OR. &
1238	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1239	.AND. i == nxr-1 ) .OR. &
1240	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1241	.AND. i == nxlu ) ) &
1242	THEN
1243	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1244	ELSE
1245	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1246	ENDIF
1247	!
1248	!-- scalar - y-direction
1249	!-- WS1 (3), WS3 (4), WS5 (5)
1250	IF ( k <= nzb_s_inner(j+1,i) .OR. &
1251	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1252	.AND. j == nys ) .OR. &
1253	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1254	.AND. j == nyn ) ) &
1255	THEN
1256	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1257	!
1258	!-- WS3
1259	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1260	.OR. &
1261	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1262	.AND. j == nysv ) .OR. &
1263	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1264	.AND. j == nyn-1 ) ) &
1265	THEN
1266	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1267	!
1268	!-- WS5
1269	ELSE
1270	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1271	ENDIF
1272	!
1273	!-- scalar - z-direction
1274	!-- WS1 (6), WS3 (7), WS5 (8)
1275	flag_set = .FALSE.
1276	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1277	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1278	flag_set = .TRUE.
1279	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1280	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1281	flag_set = .TRUE.
1282	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1283	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1284	ENDIF
1285	ENDDO
1286	ENDDO
1287	ENDDO
1288	ENDIF
1289
1290	IF ( momentum_advec == 'ws-scheme' ) THEN
1291	!
1292	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1293	!-- near topography, inflow- and outflow boundaries as well as bottom and
1294	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1295	!-- grid points.
1296	DO i = nxl, nxr
1297	DO j = nys, nyn
1298	DO k = nzb+1, nzt
1299	!
1300	!-- At first, set flags to WS1.
1301	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1302	!-- in order to handle the left/south flux.
1303	!-- near vertical walls.
1304	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1305	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1306	!
1307	!-- u component - x-direction
1308	!-- WS1 (9), WS3 (10), WS5 (11)
1309	IF ( k <= nzb_u_inner(j,i+1) .OR. &
1310	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1311	.AND. i <= nxlu ) .OR. &
1312	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1313	.AND. i == nxr ) ) &
1314	THEN
1315	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1316	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1317	.OR. &
1318	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1319	.AND. i == nxr-1 ) .OR. &
1320	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1321	.AND. i == nxlu+1) ) &
1322	THEN
1323	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1324	!
1325	!-- Clear flag for WS1
1326	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1327	ELSE
1328	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1329	!
1330	!-- Clear flag for WS1
1331	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1332	ENDIF
1333	!
1334	!-- u component - y-direction
1335	!-- WS1 (12), WS3 (13), WS5 (14)
1336	IF ( k <= nzb_u_inner(j+1,i) .OR. &
1337	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1338	.AND. j == nys ) .OR. &
1339	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1340	.AND. j == nyn ) ) &
1341	THEN
1342	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1343	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1344	.OR. &
1345	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1346	.AND. j == nysv ) .OR. &
1347	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1348	.AND. j == nyn-1 ) ) &
1349	THEN
1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1351	!
1352	!-- Clear flag for WS1
1353	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1354	ELSE
1355	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1356	!
1357	!-- Clear flag for WS1
1358	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1359	ENDIF
1360	!
1361	!-- u component - z-direction
1362	!-- WS1 (15), WS3 (16), WS5 (17)
1363	flag_set = .FALSE.
1364	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1365	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1366	flag_set = .TRUE.
1367	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1368	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1369	flag_set = .TRUE.
1370	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1371	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1372	ENDIF
1373
1374	ENDDO
1375	ENDDO
1376	ENDDO
1377
1378	DO i = nxl, nxr
1379	DO j = nys, nyn
1380	DO k = nzb+1, nzt
1381	!
1382	!-- At first, set flags to WS1.
1383	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1384	!-- in order to handle the left/south flux.
1385	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1386	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1387	!
1388	!-- v component - x-direction
1389	!-- WS1 (18), WS3 (19), WS5 (20)
1390	IF ( k <= nzb_v_inner(j,i+1) .OR. &
1391	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1392	.AND. i == nxl ) .OR. &
1393	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1394	.AND. i == nxr ) ) &
1395	THEN
1396	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1397	!
1398	!-- WS3
1399	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1400	.OR. &
1401	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1402	.AND. i == nxr-1 ) .OR. &
1403	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1404	.AND. i == nxlu ) ) &
1405	THEN
1406	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1407	!
1408	!-- Clear flag for WS1
1409	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1410	ELSE
1411	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1412	!
1413	!-- Clear flag for WS1
1414	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1415	ENDIF
1416	!
1417	!-- v component - y-direction
1418	!-- WS1 (21), WS3 (22), WS5 (23)
1419	IF ( k <= nzb_v_inner(j+1,i) .OR. &
1420	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1421	.AND. j <= nysv ) .OR. &
1422	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1423	.AND. j == nyn ) ) &
1424	THEN
1425	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1426	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1427	.OR. &
1428	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1429	.AND. j == nysv+1) .OR. &
1430	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1431	.AND. j == nyn-1 ) ) &
1432	THEN
1433	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1434	!
1435	!-- Clear flag for WS1
1436	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1437	ELSE
1438	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1439	!
1440	!-- Clear flag for WS1
1441	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1442	ENDIF
1443	!
1444	!-- v component - z-direction
1445	!-- WS1 (24), WS3 (25), WS5 (26)
1446	flag_set = .FALSE.
1447	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1448	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1449	flag_set = .TRUE.
1450	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1451	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1452	flag_set = .TRUE.
1453	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1454	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1455	ENDIF
1456
1457	ENDDO
1458	ENDDO
1459	ENDDO
1460	DO i = nxl, nxr
1461	DO j = nys, nyn
1462	DO k = nzb+1, nzt
1463	!
1464	!-- At first, set flags to WS1.
1465	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1466	!-- in order to handle the left/south flux.
1467	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1468	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1469	!
1470	!-- w component - x-direction
1471	!-- WS1 (27), WS3 (28), WS5 (29)
1472	IF ( k <= nzb_w_inner(j,i+1) .OR. &
1473	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1474	.AND. i == nxl ) .OR. &
1475	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1476	.AND. i == nxr ) ) &
1477	THEN
1478	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1479	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1480	.OR. &
1481	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1482	.AND. i == nxr-1 ) .OR. &
1483	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1484	.AND. i == nxlu ) ) &
1485	THEN
1486	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1487	!
1488	!-- Clear flag for WS1
1489	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1490	ELSE
1491	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1492	!
1493	!-- Clear flag for WS1
1494	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1495	ENDIF
1496	!
1497	!-- w component - y-direction
1498	!-- WS1 (30), WS3 (31), WS5 (32)
1499	IF ( k <= nzb_w_inner(j+1,i) .OR. &
1500	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1501	.AND. j == nys ) .OR. &
1502	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1503	.AND. j == nyn ) ) &
1504	THEN
1505	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1506	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1507	.OR. &
1508	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1509	.AND. j == nysv ) .OR. &
1510	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1511	.AND. j == nyn-1 ) ) &
1512	THEN
1513	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1514	!
1515	!-- Clear flag for WS1
1516	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1517	ELSE
1518	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1519	!
1520	!-- Clear flag for WS1
1521	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1522	ENDIF
1523	!
1524	!-- w component - z-direction
1525	!-- WS1 (33), WS3 (34), WS5 (35)
1526	flag_set = .FALSE.
1527	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1528	.OR. k == nzt ) THEN
1529	!
1530	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1531	!-- set, although this is not a prognostic level. However,
1532	!-- contrary to the advection of u,v and s this is necessary
1533	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1534	!-- at k == nzb_w_inner(j,i)+1.
1535	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1536	flag_set = .TRUE.
1537	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1538	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1539	flag_set = .TRUE.
1540	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1541	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1542	ENDIF
1543
1544	ENDDO
1545	ENDDO
1546	ENDDO
1547
1548	ENDIF
1549
1550	!
1551	!-- Exchange 3D integer wall_flags.
1552	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1553	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1554	!
1555	!-- Exchange ghost points for advection flags
1556	CALL exchange_horiz_int( wall_flags_0, nbgp )
1557	CALL exchange_horiz_int( wall_flags_00, nbgp )
1558	!
1559	!-- Set boundary flags at inflow and outflow boundary in case of
1560	!-- non-cyclic boundary conditions.
1561	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1562	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1563	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1564	ENDIF
1565
1566	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
1567	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1568	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1569	ENDIF
1570
1571	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
1572	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1573	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1574	ENDIF
1575
1576	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1577	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1578	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1579	ENDIF
1580
1581	ENDIF
1582
1583	!
1584	!-- In case of topography: limit near-wall mixing length l_wall further:
1585	!-- Go through all points of the subdomain one by one and look for the closest
1586	!-- surface
1587	IF ( TRIM(topography) /= 'flat' ) THEN
1588	DO i = nxl, nxr
1589	DO j = nys, nyn
1590
1591	nzb_si = nzb_s_inner(j,i)
1592	vi = vertical_influence(nzb_si)
1593
1594	IF ( wall_n(j,i) > 0 ) THEN
1595	!
1596	!-- North wall (y distance)
1597	DO k = wall_n(j,i), nzb_si
1598	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1599	ENDDO
1600	!
1601	!-- Above North wall (yz distance)
1602	DO k = nzb_si + 1, nzb_si + vi
1603	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1604	SQRT( 0.25_wp * dy**2 + &
1605	( zu(k) - zw(nzb_si) )**2 ) )
1606	ENDDO
1607	!
1608	!-- Northleft corner (xy distance)
1609	IF ( corner_nl(j,i) > 0 ) THEN
1610	DO k = corner_nl(j,i), nzb_si
1611	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1612	0.5_wp * SQRT( dx2 + dy2 ) )
1613	ENDDO
1614	!
1615	!-- Above Northleft corner (xyz distance)
1616	DO k = nzb_si + 1, nzb_si + vi
1617	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1618	SQRT( 0.25_wp * (dx2 + dy2) + &
1619	( zu(k) - zw(nzb_si) )**2 ) )
1620	ENDDO
1621	ENDIF
1622	!
1623	!-- Northright corner (xy distance)
1624	IF ( corner_nr(j,i) > 0 ) THEN
1625	DO k = corner_nr(j,i), nzb_si
1626	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1627	0.5_wp * SQRT( dx2 + dy2 ) )
1628	ENDDO
1629	!
1630	!-- Above northright corner (xyz distance)
1631	DO k = nzb_si + 1, nzb_si + vi
1632	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1633	SQRT( 0.25_wp * (dx2 + dy2) + &
1634	( zu(k) - zw(nzb_si) )**2 ) )
1635	ENDDO
1636	ENDIF
1637	ENDIF
1638
1639	IF ( wall_s(j,i) > 0 ) THEN
1640	!
1641	!-- South wall (y distance)
1642	DO k = wall_s(j,i), nzb_si
1643	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1644	ENDDO
1645	!
1646	!-- Above south wall (yz distance)
1647	DO k = nzb_si + 1, nzb_si + vi
1648	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1649	SQRT( 0.25_wp * dy**2 + &
1650	( zu(k) - zw(nzb_si) )**2 ) )
1651	ENDDO
1652	!
1653	!-- Southleft corner (xy distance)
1654	IF ( corner_sl(j,i) > 0 ) THEN
1655	DO k = corner_sl(j,i), nzb_si
1656	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1657	0.5_wp * SQRT( dx2 + dy2 ) )
1658	ENDDO
1659	!
1660	!-- Above southleft corner (xyz distance)
1661	DO k = nzb_si + 1, nzb_si + vi
1662	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1663	SQRT( 0.25_wp * (dx2 + dy2) + &
1664	( zu(k) - zw(nzb_si) )**2 ) )
1665	ENDDO
1666	ENDIF
1667	!
1668	!-- Southright corner (xy distance)
1669	IF ( corner_sr(j,i) > 0 ) THEN
1670	DO k = corner_sr(j,i), nzb_si
1671	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1672	0.5_wp * SQRT( dx2 + dy2 ) )
1673	ENDDO
1674	!
1675	!-- Above southright corner (xyz distance)
1676	DO k = nzb_si + 1, nzb_si + vi
1677	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1678	SQRT( 0.25_wp * (dx2 + dy2) + &
1679	( zu(k) - zw(nzb_si) )**2 ) )
1680	ENDDO
1681	ENDIF
1682
1683	ENDIF
1684
1685	IF ( wall_l(j,i) > 0 ) THEN
1686	!
1687	!-- Left wall (x distance)
1688	DO k = wall_l(j,i), nzb_si
1689	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1690	ENDDO
1691	!
1692	!-- Above left wall (xz distance)
1693	DO k = nzb_si + 1, nzb_si + vi
1694	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1695	SQRT( 0.25_wp * dx**2 + &
1696	( zu(k) - zw(nzb_si) )**2 ) )
1697	ENDDO
1698	ENDIF
1699
1700	IF ( wall_r(j,i) > 0 ) THEN
1701	!
1702	!-- Right wall (x distance)
1703	DO k = wall_r(j,i), nzb_si
1704	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1705	ENDDO
1706	!
1707	!-- Above right wall (xz distance)
1708	DO k = nzb_si + 1, nzb_si + vi
1709	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1710	SQRT( 0.25_wp * dx**2 + &
1711	( zu(k) - zw(nzb_si) )**2 ) )
1712	ENDDO
1713
1714	ENDIF
1715
1716	ENDDO
1717	ENDDO
1718
1719	ENDIF
1720
1721	!
1722	!-- Multiplication with wall_adjustment_factor
1723	l_wall = wall_adjustment_factor * l_wall
1724
1725	!
1726	!-- Set lateral boundary conditions for l_wall
1727	CALL exchange_horiz( l_wall, nbgp )
1728
1729	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1730	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1731
1732	#endif
1733
1734	END SUBROUTINE init_grid

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

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |