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source: palm/trunk/SOURCE/init_grid.f90 @ 1931

Last change on this file since 1931 was 1931, checked in by suehring, 8 years ago
Rename multigrid into multigrid_noopt and multigrid_fast into multigrid, subroutines poismg is renamed into poismg_noopt and poismg_fast_mod into poismg_mod
Property svn:keywords set to `Id`
File size: 75.8 KB

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1	!> @file init_grid.f90
2	!-------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2016 Leibniz Universitaet Hannover
17	!-------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! -----------------
21	! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_grid.f90 1931 2016-06-10 12:06:59Z suehring $
26	!
27	! 1910 2016-05-26 06:49:46Z raasch
28	! Bugfix: if topography is read from file, Neumann conditions are used for the
29	! nzb_local array (instead of cyclic conditions) in case that non-cyclic
30	! boundary conditions are switched on for the run
31	!
32	! 1902 2016-05-09 11:18:56Z suehring
33	! Set topography flags for multigrid solver only (not for multigrid_fast)
34	!
35	! 1886 2016-04-21 11:20:47Z suehring
36	! Bugfix: setting advection flags near walls
37	! reformulated index values for nzb_v_inner
38	! variable discriptions added in declaration block
39	!
40	! 1845 2016-04-08 08:29:13Z raasch
41	! nzb_2d removed
42	!
43	! 1804 2016-04-05 16:30:18Z maronga
44	! Removed code for parameter file check (__check)
45	!
46	! 1779 2016-03-03 08:01:28Z raasch
47	! coupling_char is trimmed at every place it occurs, because it can have
48	! different length now
49	!
50	! 1762 2016-02-25 12:31:13Z hellstea
51	! Introduction of nested domain feature
52	!
53	! 1743 2016-01-13 10:23:51Z raasch
54	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
55	! total domain
56	!
57	! 1691 2015-10-26 16:17:44Z maronga
58	! Renamed prandtl_layer to constant_flux_layer.
59	!
60	! 1682 2015-10-07 23:56:08Z knoop
61	! Code annotations made doxygen readable
62	!
63	! 1677 2015-10-02 13:25:23Z boeske
64	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
65	!
66	! 1675 2015-10-02 08:28:59Z gronemeier
67	! Bugfix: Definition of topography grid levels
68	!
69	! 1660 2015-09-21 08:15:16Z gronemeier
70	! Bugfix: Definition of topography grid levels if vertical grid stretching
71	! starts below the maximum topography height.
72	!
73	! 1580 2015-04-10 13:43:49Z suehring
74	! Bugfix: setting flags for 5th order scheme near buildings
75	!
76	! 1575 2015-03-27 09:56:27Z raasch
77	! adjustments for psolver-queries
78	!
79	! 1557 2015-03-05 16:43:04Z suehring
80	! Adjustment for monotoinic limiter
81	!
82	! 1418 2014-06-06 13:05:08Z fricke
83	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
84	! condition and a negative value for dz_stretch_level the condition
85	! was always true for the whole model domain
86	!
87	! 1409 2014-05-23 12:11:32Z suehring
88	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
89	! j <= nysv
90	!
91	! 1353 2014-04-08 15:21:23Z heinze
92	! REAL constants provided with KIND-attribute
93	!
94	! 1322 2014-03-20 16:38:49Z raasch
95	! REAL constants defined as wp-kind
96	!
97	! 1320 2014-03-20 08:40:49Z raasch
98	! ONLY-attribute added to USE-statements,
99	! kind-parameters added to all INTEGER and REAL declaration statements,
100	! kinds are defined in new module kinds,
101	! revision history before 2012 removed,
102	! comment fields (!:) to be used for variable explanations added to
103	! all variable declaration statements
104	!
105	! 1221 2013-09-10 08:59:13Z raasch
106	! wall_flags_00 introduced to hold bits 32-63,
107	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
108	! loops optimized for openACC (pres + flow_statistics)
109	!
110	! 1092 2013-02-02 11:24:22Z raasch
111	! unused variables removed
112	!
113	! 1069 2012-11-28 16:18:43Z maronga
114	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
115	! ocean model in case of coupled runs
116	!
117	! 1036 2012-10-22 13:43:42Z raasch
118	! code put under GPL (PALM 3.9)
119	!
120	! 1015 2012-09-27 09:23:24Z raasch
121	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
122	! nzb_w_inner+1
123	!
124	! 996 2012-09-07 10:41:47Z raasch
125	! little reformatting
126	!
127	! 978 2012-08-09 08:28:32Z fricke
128	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
129	! Bugfix: Set wall_flags_0 for inflow boundary
130	!
131	! 927 2012-06-06 19:15:04Z raasch
132	! Wall flags are not set for multigrid method in case of masking method
133	!
134	! 864 2012-03-27 15:10:33Z gryschka
135	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
136	! were not correctly defined for k=1.
137	!
138	! 861 2012-03-26 14:18:34Z suehring
139	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
140	! inflow and outflow boundaries as well as near the bottom and the top of the
141	! model domain.!
142	! Initialization of nzb_s_inner and nzb_w_inner.
143	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
144	! while setting wall_flags_0
145	!
146	! 843 2012-02-29 15:16:21Z gryschka
147	! In case of ocean and dirichlet bc for u and v at the bottom
148	! the first u-level ist defined at same height as the first w-level
149	!
150	! 818 2012-02-08 16:11:23Z maronga
151	! Bugfix: topo_height is only required if topography is used. It is thus now
152	! allocated in the topography branch
153	!
154	! 809 2012-01-30 13:32:58Z maronga
155	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
156	!
157	! 807 2012-01-25 11:53:51Z maronga
158	! New cpp directive "__check" implemented which is used by check_namelist_files
159	!
160	! Revision 1.1 1997/08/11 06:17:45 raasch
161	! Initial revision (Testversion)
162	!
163	!
164	! Description:
165	! ------------
166	!> Creating grid depending constants
167	!------------------------------------------------------------------------------!
168	SUBROUTINE init_grid
169
170
171	USE arrays_3d, &
172	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
173	f2_mg, f3_mg, l_grid, l_wall, zu, zw
174
175	USE control_parameters, &
176	ONLY: bc_lr_cyc, bc_ns_cyc, building_height, building_length_x, &
177	building_length_y, building_wall_left, building_wall_south, &
178	canyon_height, canyon_wall_left, canyon_wall_south, &
179	canyon_width_x, canyon_width_y, constant_flux_layer, &
180	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
181	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
182	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
183	masking_method, maximum_grid_level, message_string, &
184	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
185	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
186	outflow_r, outflow_s, psolver, scalar_advec, topography, &
187	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
188	wall_adjustment_factor
189
190	USE grid_variables, &
191	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
192	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
193	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
194
195	USE indices, &
196	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
197	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
198	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
199	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
200	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
201	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
202	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
203	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
204	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
205	wall_flags_9
206
207	USE kinds
208
209	USE pegrid
210
211	IMPLICIT NONE
212
213	INTEGER(iwp) :: bh !< temporary vertical index of building height
214	INTEGER(iwp) :: blx !< grid point number of building size along x
215	INTEGER(iwp) :: bly !< grid point number of building size along y
216	INTEGER(iwp) :: bxl !< index for left building wall
217	INTEGER(iwp) :: bxr !< index for right building wall
218	INTEGER(iwp) :: byn !< index for north building wall
219	INTEGER(iwp) :: bys !< index for south building wall
220	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
221	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
222	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
223	INTEGER(iwp) :: cxl !< index for left canyon wall
224	INTEGER(iwp) :: cxr !< index for right canyon wall
225	INTEGER(iwp) :: cyn !< index for north canyon wall
226	INTEGER(iwp) :: cys !< index for south canyon wall
227	INTEGER(iwp) :: gls !< number of lateral ghost points at total model domain boundaries required for multigrid solver
228	INTEGER(iwp) :: i !< index variable along x
229	INTEGER(iwp) :: ii !< loop variable for reading topography file
230	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
231	INTEGER(iwp) :: j !< index variable along y
232	INTEGER(iwp) :: k !< index variable along z
233	INTEGER(iwp) :: l !< loop variable
234	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
235	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
236	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
237	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
238	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
239	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
240	INTEGER(iwp) :: vi !< dummy for vertical influence
241
242	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
243	vertical_influence !< number of vertical grid points above obstacle where adjustment of near-wall mixing length is required
244
245	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of north-left corner location to limit near-wall mixing length
246	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
247	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
248	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
249	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to adjacent left-facing
250	!< wall
251	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
252	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
253	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
254	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography
255	!< top at cell-center
256	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate topography indices on u- and v-grid
257
258	LOGICAL :: flag_set = .FALSE. !< steering variable for advection flags
259
260	REAL(wp) :: dx_l !< grid spacing along x on different multigrid level
261	REAL(wp) :: dy_l !< grid spacing along y on different multigrid level
262	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
263
264	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for topography height
265
266
267	!
268	!-- Calculation of horizontal array bounds including ghost layers
269	nxlg = nxl - nbgp
270	nxrg = nxr + nbgp
271	nysg = nys - nbgp
272	nyng = nyn + nbgp
273
274	!
275	!-- Allocate grid arrays
276	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
277	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
278
279	!
280	!-- Compute height of u-levels from constant grid length and dz stretch factors
281	IF ( dz == -1.0_wp ) THEN
282	message_string = 'missing dz'
283	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
284	ELSEIF ( dz <= 0.0_wp ) THEN
285	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
286	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
287	ENDIF
288
289	!
290	!-- Define the vertical grid levels
291	IF ( .NOT. ocean ) THEN
292	!
293	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
294	!-- The second u-level (k=1) corresponds to the top of the
295	!-- Prandtl-layer.
296
297	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
298	zu(0) = 0.0_wp
299	! zu(0) = - dz * 0.5_wp
300	ELSE
301	zu(0) = - dz * 0.5_wp
302	ENDIF
303	zu(1) = dz * 0.5_wp
304
305	dz_stretch_level_index = nzt+1
306	dz_stretched = dz
307	DO k = 2, nzt+1
308	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
309	dz_stretched = dz_stretched * dz_stretch_factor
310	dz_stretched = MIN( dz_stretched, dz_max )
311	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
312	ENDIF
313	zu(k) = zu(k-1) + dz_stretched
314	ENDDO
315
316	!
317	!-- Compute the w-levels. They are always staggered half-way between the
318	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
319	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
320	!-- The top w-level is extrapolated linearly.
321	zw(0) = 0.0_wp
322	DO k = 1, nzt
323	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
324	ENDDO
325	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
326
327	ELSE
328	!
329	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
330	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
331	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
332	!-- w-level are defined at same height, but staggered from the second level.
333	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
334	zu(nzt+1) = dz * 0.5_wp
335	zu(nzt) = - dz * 0.5_wp
336
337	dz_stretch_level_index = 0
338	dz_stretched = dz
339	DO k = nzt-1, 0, -1
340	!
341	!-- The default value of dz_stretch_level is positive, thus the first
342	!-- condition is always true. Hence, the second condition is necessary.
343	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
344	.AND. dz_stretched < dz_max ) THEN
345	dz_stretched = dz_stretched * dz_stretch_factor
346	dz_stretched = MIN( dz_stretched, dz_max )
347	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
348	ENDIF
349	zu(k) = zu(k+1) - dz_stretched
350	ENDDO
351
352	!
353	!-- Compute the w-levels. They are always staggered half-way between the
354	!-- corresponding u-levels, except in case of dirichlet bc for u and v
355	!-- at the ground. In this case the first u- and w-level are defined at
356	!-- same height. The top w-level (nzt+1) is not used but set for
357	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
358	zw(nzt+1) = dz
359	zw(nzt) = 0.0_wp
360	DO k = 0, nzt
361	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
362	ENDDO
363
364	!
365	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
366	!-- at same height.
367	IF ( ibc_uv_b == 0 ) THEN
368	zu(0) = zw(0)
369	ENDIF
370
371	ENDIF
372
373	!
374	!-- Compute grid lengths.
375	DO k = 1, nzt+1
376	dzu(k) = zu(k) - zu(k-1)
377	ddzu(k) = 1.0_wp / dzu(k)
378	dzw(k) = zw(k) - zw(k-1)
379	ddzw(k) = 1.0_wp / dzw(k)
380	ENDDO
381
382	DO k = 1, nzt
383	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
384	ENDDO
385
386	!
387	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
388	!-- everywhere. For the actual grid, the grid spacing at the lowest level
389	!-- is only dz/2, but should be dz. Therefore, an additional array
390	!-- containing with appropriate grid information is created for these
391	!-- solvers.
392	IF ( psolver(1:9) /= 'multigrid' ) THEN
393	ALLOCATE( ddzu_pres(1:nzt+1) )
394	ddzu_pres = ddzu
395	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
396	ENDIF
397
398	!
399	!-- In case of multigrid method, compute grid lengths and grid factors for the
400	!-- grid levels
401	IF ( psolver(1:9) == 'multigrid' ) THEN
402
403	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
404	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
405	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
406	f1_mg(nzb+1:nzt,maximum_grid_level), &
407	f2_mg(nzb+1:nzt,maximum_grid_level), &
408	f3_mg(nzb+1:nzt,maximum_grid_level) )
409
410	dzu_mg(:,maximum_grid_level) = dzu
411	!
412	!-- Next line to ensure an equally spaced grid.
413	dzu_mg(1,maximum_grid_level) = dzu(2)
414
415	dzw_mg(:,maximum_grid_level) = dzw
416	nzt_l = nzt
417	DO l = maximum_grid_level-1, 1, -1
418	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
419	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
420	nzt_l = nzt_l / 2
421	DO k = 2, nzt_l+1
422	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
423	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
424	ENDDO
425	ENDDO
426
427	nzt_l = nzt
428	dx_l = dx
429	dy_l = dy
430	DO l = maximum_grid_level, 1, -1
431	ddx2_mg(l) = 1.0_wp / dx_l**2
432	ddy2_mg(l) = 1.0_wp / dy_l**2
433	DO k = nzb+1, nzt_l
434	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
435	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
436	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
437	f2_mg(k,l) + f3_mg(k,l)
438	ENDDO
439	nzt_l = nzt_l / 2
440	dx_l = dx_l * 2.0_wp
441	dy_l = dy_l * 2.0_wp
442	ENDDO
443
444	ENDIF
445
446	!
447	!-- Compute the reciprocal values of the horizontal grid lengths.
448	ddx = 1.0_wp / dx
449	ddy = 1.0_wp / dy
450	dx2 = dx * dx
451	dy2 = dy * dy
452	ddx2 = 1.0_wp / dx2
453	ddy2 = 1.0_wp / dy2
454
455	!
456	!-- Compute the grid-dependent mixing length.
457	DO k = 1, nzt
458	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
459	ENDDO
460
461	!
462	!-- Allocate outer and inner index arrays for topography and set
463	!-- defaults.
464	!-- nzb_local has to contain additional layers of ghost points for calculating
465	!-- the flag arrays needed for the multigrid method
466	gls = 2**( maximum_grid_level )
467	IF ( gls < nbgp ) gls = nbgp
468
469	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
470	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
471	nzb_local(-gls:ny+gls,-gls:nx+gls), &
472	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
473	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
474	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
475	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
476	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
477	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
478	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
479	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
480	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
481	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
482	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
483	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
484	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
485	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
486	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
487	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
488	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
489	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
490	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
491	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
492	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
493	wall_e_x(nysg:nyng,nxlg:nxrg), &
494	wall_e_y(nysg:nyng,nxlg:nxrg), &
495	wall_u(nysg:nyng,nxlg:nxrg), &
496	wall_v(nysg:nyng,nxlg:nxrg), &
497	wall_w_x(nysg:nyng,nxlg:nxrg), &
498	wall_w_y(nysg:nyng,nxlg:nxrg) )
499
500
501
502	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
503
504
505	nzb_s_inner = nzb; nzb_s_outer = nzb
506	nzb_u_inner = nzb; nzb_u_outer = nzb
507	nzb_v_inner = nzb; nzb_v_outer = nzb
508	nzb_w_inner = nzb; nzb_w_outer = nzb
509
510	rflags_s_inner = 1.0_wp
511	rflags_invers = 1.0_wp
512
513	!
514	!-- Define vertical gridpoint from (or to) which on the usual finite difference
515	!-- form (which does not use surface fluxes) is applied
516	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
517	nzb_diff = nzb + 2
518	ELSE
519	nzb_diff = nzb + 1
520	ENDIF
521	IF ( use_top_fluxes ) THEN
522	nzt_diff = nzt - 1
523	ELSE
524	nzt_diff = nzt
525	ENDIF
526
527	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
528	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
529
530	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
531	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
532	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
533	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
534
535	!
536	!-- Initialize near-wall mixing length l_wall only in the vertical direction
537	!-- for the moment,
538	!-- multiplication with wall_adjustment_factor near the end of this routine
539	l_wall(nzb,:,:) = l_grid(1)
540	DO k = nzb+1, nzt
541	l_wall(k,:,:) = l_grid(k)
542	ENDDO
543	l_wall(nzt+1,:,:) = l_grid(nzt)
544
545	ALLOCATE ( vertical_influence(nzb:nzt) )
546	DO k = 1, nzt
547	vertical_influence(k) = MIN ( INT( l_grid(k) / &
548	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
549	ENDDO
550
551	DO k = 1, MAXVAL( nzb_s_inner )
552	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
553	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
554	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
555	'threshold given by only local', &
556	' &horizontal reduction of near_wall ', &
557	'mixing length l_wall', &
558	' &starting from height level k = ', k, '.'
559	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
560	EXIT
561	ENDIF
562	ENDDO
563	vertical_influence(0) = vertical_influence(1)
564
565	DO i = nxlg, nxrg
566	DO j = nysg, nyng
567	DO k = nzb_s_inner(j,i) + 1, &
568	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
569	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
570	ENDDO
571	ENDDO
572	ENDDO
573
574	!
575	!-- Set outer and inner index arrays for non-flat topography.
576	!-- Here consistency checks concerning domain size and periodicity are
577	!-- necessary.
578	!-- Within this SELECT CASE structure only nzb_local is initialized
579	!-- individually depending on the chosen topography type, all other index
580	!-- arrays are initialized further below.
581	SELECT CASE ( TRIM( topography ) )
582
583	CASE ( 'flat' )
584	!
585	!-- nzb_local is required for the multigrid solver
586	nzb_local = 0
587
588	CASE ( 'single_building' )
589	!
590	!-- Single rectangular building, by default centered in the middle of the
591	!-- total domain
592	blx = NINT( building_length_x / dx )
593	bly = NINT( building_length_y / dy )
594	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
595	IF ( ABS( zw(bh ) - building_height ) == &
596	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
597
598	IF ( building_wall_left == 9999999.9_wp ) THEN
599	building_wall_left = ( nx + 1 - blx ) / 2 * dx
600	ENDIF
601	bxl = NINT( building_wall_left / dx )
602	bxr = bxl + blx
603
604	IF ( building_wall_south == 9999999.9_wp ) THEN
605	building_wall_south = ( ny + 1 - bly ) / 2 * dy
606	ENDIF
607	bys = NINT( building_wall_south / dy )
608	byn = bys + bly
609
610	!
611	!-- Building size has to meet some requirements
612	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
613	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
614	WRITE( message_string, * ) 'inconsistent building parameters:', &
615	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
616	'byn=', byn, 'nx=', nx, 'ny=', ny
617	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
618	ENDIF
619
620	!
621	!-- Define the building.
622	nzb_local = 0
623	nzb_local(bys:byn,bxl:bxr) = bh
624
625	CASE ( 'single_street_canyon' )
626	!
627	!-- Single quasi-2D street canyon of infinite length in x or y direction.
628	!-- The canyon is centered in the other direction by default.
629	IF ( canyon_width_x /= 9999999.9_wp ) THEN
630	!
631	!-- Street canyon in y direction
632	cwx = NINT( canyon_width_x / dx )
633	IF ( canyon_wall_left == 9999999.9_wp ) THEN
634	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
635	ENDIF
636	cxl = NINT( canyon_wall_left / dx )
637	cxr = cxl + cwx
638
639	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
640	!
641	!-- Street canyon in x direction
642	cwy = NINT( canyon_width_y / dy )
643	IF ( canyon_wall_south == 9999999.9_wp ) THEN
644	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
645	ENDIF
646	cys = NINT( canyon_wall_south / dy )
647	cyn = cys + cwy
648
649	ELSE
650
651	message_string = 'no street canyon width given'
652	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
653
654	ENDIF
655
656	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
657	IF ( ABS( zw(ch ) - canyon_height ) == &
658	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
659
660	dp_level_ind_b = ch
661	!
662	!-- Street canyon size has to meet some requirements
663	IF ( canyon_width_x /= 9999999.9_wp ) THEN
664	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
665	( ch < 3 ) ) THEN
666	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
667	'&cxl=', cxl, 'cxr=', cxr, &
668	'cwx=', cwx, &
669	'ch=', ch, 'nx=', nx, 'ny=', ny
670	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
671	ENDIF
672	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
673	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
674	( ch < 3 ) ) THEN
675	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
676	'&cys=', cys, 'cyn=', cyn, &
677	'cwy=', cwy, &
678	'ch=', ch, 'nx=', nx, 'ny=', ny
679	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
680	ENDIF
681	ENDIF
682	IF ( canyon_width_x /= 9999999.9_wp .AND. &
683	canyon_width_y /= 9999999.9_wp ) THEN
684	message_string = 'inconsistent canyon parameters:' // &
685	'&street canyon can only be oriented' // &
686	'&either in x- or in y-direction'
687	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
688	ENDIF
689
690	nzb_local = ch
691	IF ( canyon_width_x /= 9999999.9_wp ) THEN
692	nzb_local(:,cxl+1:cxr-1) = 0
693	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
694	nzb_local(cys+1:cyn-1,:) = 0
695	ENDIF
696
697	CASE ( 'read_from_file' )
698
699	ALLOCATE ( topo_height(0:ny,0:nx) )
700
701	DO ii = 0, io_blocks-1
702	IF ( ii == io_group ) THEN
703
704	!
705	!-- Arbitrary irregular topography data in PALM format (exactly
706	!-- matching the grid size and total domain size)
707	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
708	STATUS='OLD', FORM='FORMATTED', ERR=10 )
709	DO j = ny, 0, -1
710	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
711	ENDDO
712
713	GOTO 12
714
715	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
716	' does not exist'
717	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
718
719	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
720	TRIM( coupling_char )
721	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
722
723	12 CLOSE( 90 )
724
725	ENDIF
726	#if defined( __parallel )
727	CALL MPI_BARRIER( comm2d, ierr )
728	#endif
729	ENDDO
730
731	!
732	!-- Calculate the index height of the topography
733	DO i = 0, nx
734	DO j = 0, ny
735	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
736	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
737	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
738	nzb_local(j,i) = nzb_local(j,i) + 1
739	ENDDO
740	ENDDO
741
742	DEALLOCATE ( topo_height )
743
744	!
745	!-- Add cyclic or Neumann boundary conditions (additional layers are for
746	!-- calculating flag arrays needed for the multigrid sover)
747	IF ( bc_ns_cyc ) THEN
748	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
749	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
750	ELSE
751	DO j = -gls, -1
752	nzb_local(j,0:nx) = nzb_local(0,0:nx)
753	ENDDO
754	DO j = ny+1, ny+gls
755	nzb_local(j,0:nx) = nzb_local(ny,0:nx)
756	ENDDO
757	ENDIF
758
759	IF ( bc_lr_cyc ) THEN
760	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
761	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
762	ELSE
763	DO i = -gls, -1
764	nzb_local(:,i) = nzb_local(:,0)
765	ENDDO
766	DO i = nx+1, nx+gls
767	nzb_local(:,i) = nzb_local(:,nx)
768	ENDDO
769	ENDIF
770
771	CASE DEFAULT
772	!
773	!-- The DEFAULT case is reached either if the parameter topography
774	!-- contains a wrong character string or if the user has defined a special
775	!-- case in the user interface. There, the subroutine user_init_grid
776	!-- checks which of these two conditions applies.
777	CALL user_init_grid( gls, nzb_local )
778
779	END SELECT
780	!
781	!-- Determine the maximum level of topography. Furthermore it is used for
782	!-- steering the degradation of order of the applied advection scheme.
783	!-- In case of non-cyclic lateral boundaries, the order of the advection
784	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
785	nzb_max = MAXVAL( nzb_local ) + 1
786	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
787	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
788	nest_domain ) &
789	THEN
790	nzb_max = nzt
791	ENDIF
792
793	!
794	!-- Consistency checks and index array initialization are only required for
795	!-- non-flat topography, also the initialization of topography height arrays
796	!-- zu_s_inner and zw_w_inner
797	IF ( TRIM( topography ) /= 'flat' ) THEN
798
799	!
800	!-- Consistency checks
801	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
802	WRITE( message_string, * ) 'nzb_local values are outside the', &
803	'model domain', &
804	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
805	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
806	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
807	ENDIF
808
809	IF ( bc_lr_cyc ) THEN
810	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
811	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
812	message_string = 'nzb_local does not fulfill cyclic' // &
813	' boundary condition in x-direction'
814	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
815	ENDIF
816	ENDIF
817	IF ( bc_ns_cyc ) THEN
818	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
819	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
820	message_string = 'nzb_local does not fulfill cyclic' // &
821	' boundary condition in y-direction'
822	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
823	ENDIF
824	ENDIF
825
826	IF ( topography_grid_convention == 'cell_edge' ) THEN
827	!
828	!-- The array nzb_local as defined using the 'cell_edge' convention
829	!-- describes the actual total size of topography which is defined at the
830	!-- cell edges where u=0 on the topography walls in x-direction and v=0
831	!-- on the topography walls in y-direction. However, PALM uses individual
832	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
833	!-- Therefore, the extent of topography in nzb_local is now reduced by
834	!-- 1dx at the E topography walls and by 1dy at the N topography walls
835	!-- to form the basis for nzb_s_inner.
836	DO j = -gls, ny + gls
837	DO i = -gls, nx
838	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
839	ENDDO
840	ENDDO
841	!-- apply cyclic boundary conditions in x-direction
842	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
843	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
844	DO i = -gls, nx + gls
845	DO j = -gls, ny
846	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
847	ENDDO
848	ENDDO
849	!-- apply cyclic boundary conditions in y-direction
850	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
851	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
852	ENDIF
853
854	!
855	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
856	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
857	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
858
859	!
860	!-- Initialize remaining index arrays:
861	!-- first pre-initialize them with nzb_s_inner...
862	nzb_u_inner = nzb_s_inner
863	nzb_u_outer = nzb_s_inner
864	nzb_v_inner = nzb_s_inner
865	nzb_v_outer = nzb_s_inner
866	nzb_w_outer = nzb_s_inner
867	nzb_s_outer = nzb_s_inner
868
869	!
870	!-- ...then extend pre-initialized arrays in their according directions
871	!-- based on nzb_local using nzb_tmp as a temporary global index array
872
873	!
874	!-- nzb_s_outer:
875	!-- extend nzb_local east-/westwards first, then north-/southwards
876	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
877	DO j = -1, ny + 1
878	DO i = 0, nx
879	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
880	nzb_local(j,i+1) )
881	ENDDO
882	ENDDO
883	DO i = nxl, nxr
884	DO j = nys, nyn
885	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
886	nzb_tmp(j+1,i) )
887	ENDDO
888	!
889	!-- non-cyclic boundary conditions (overwritten by call of
890	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
891	IF ( nys == 0 ) THEN
892	j = -1
893	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
894	ENDIF
895	IF ( nyn == ny ) THEN
896	j = ny + 1
897	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
898	ENDIF
899	ENDDO
900	!
901	!-- nzb_w_outer:
902	!-- identical to nzb_s_outer
903	nzb_w_outer = nzb_s_outer
904
905	!
906	!-- nzb_u_inner:
907	!-- extend nzb_local rightwards only
908	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
909	DO j = -1, ny + 1
910	DO i = 0, nx + 1
911	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
912	ENDDO
913	ENDDO
914	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
915
916	!
917	!-- nzb_u_outer:
918	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
919	DO i = nxl, nxr
920	DO j = nys, nyn
921	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
922	nzb_tmp(j+1,i) )
923	ENDDO
924	!
925	!-- non-cyclic boundary conditions (overwritten by call of
926	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
927	IF ( nys == 0 ) THEN
928	j = -1
929	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
930	ENDIF
931	IF ( nyn == ny ) THEN
932	j = ny + 1
933	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
934	ENDIF
935	ENDDO
936
937	!
938	!-- nzb_v_inner:
939	!-- extend nzb_local northwards only
940	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
941	DO i = -1, nx + 1
942	DO j = 0, ny + 1
943	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
944	ENDDO
945	ENDDO
946	nzb_v_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
947
948	!
949	!-- nzb_v_outer:
950	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
951	DO j = nys, nyn
952	DO i = nxl, nxr
953	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
954	nzb_tmp(j,i+1) )
955	ENDDO
956	!
957	!-- non-cyclic boundary conditions (overwritten by call of
958	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
959	IF ( nxl == 0 ) THEN
960	i = -1
961	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
962	ENDIF
963	IF ( nxr == nx ) THEN
964	i = nx + 1
965	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
966	ENDIF
967	ENDDO
968
969	!
970	!-- Exchange of lateral boundary values (parallel computers) and cyclic
971	!-- boundary conditions, if applicable.
972	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
973	!-- they do not require exchange and are not included here.
974	CALL exchange_horiz_2d_int( nzb_u_inner )
975	CALL exchange_horiz_2d_int( nzb_u_outer )
976	CALL exchange_horiz_2d_int( nzb_v_inner )
977	CALL exchange_horiz_2d_int( nzb_v_outer )
978	CALL exchange_horiz_2d_int( nzb_w_outer )
979	CALL exchange_horiz_2d_int( nzb_s_outer )
980
981	!
982	!-- Allocate and set the arrays containing the topography height
983	IF ( myid == 0 ) THEN
984
985	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
986
987	DO i = 0, nx + 1
988	DO j = 0, ny + 1
989	zu_s_inner(i,j) = zu(nzb_local(j,i))
990	zw_w_inner(i,j) = zw(nzb_local(j,i))
991	ENDDO
992	ENDDO
993
994	ENDIF
995	!
996	!-- Set flag arrays to be used for masking of grid points
997	DO i = nxlg, nxrg
998	DO j = nysg, nyng
999	DO k = nzb, nzt+1
1000	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
1001	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
1002	ENDDO
1003	ENDDO
1004	ENDDO
1005
1006	ENDIF
1007
1008	!
1009	!-- Set the individual index arrays which define the k index from which on
1010	!-- the usual finite difference form (which does not use surface fluxes) is
1011	!-- applied
1012	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
1013	nzb_diff_u = nzb_u_inner + 2
1014	nzb_diff_v = nzb_v_inner + 2
1015	nzb_diff_s_inner = nzb_s_inner + 2
1016	nzb_diff_s_outer = nzb_s_outer + 2
1017	ELSE
1018	nzb_diff_u = nzb_u_inner + 1
1019	nzb_diff_v = nzb_v_inner + 1
1020	nzb_diff_s_inner = nzb_s_inner + 1
1021	nzb_diff_s_outer = nzb_s_outer + 1
1022	ENDIF
1023
1024	!
1025	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
1026	!-- for limitation of near-wall mixing length l_wall further below
1027	corner_nl = 0
1028	corner_nr = 0
1029	corner_sl = 0
1030	corner_sr = 0
1031	wall_l = 0
1032	wall_n = 0
1033	wall_r = 0
1034	wall_s = 0
1035
1036	DO i = nxl, nxr
1037	DO j = nys, nyn
1038	!
1039	!-- u-component
1040	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
1041	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1042	fym(j,i) = 0.0_wp
1043	fyp(j,i) = 1.0_wp
1044	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
1045	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
1046	fym(j,i) = 1.0_wp
1047	fyp(j,i) = 0.0_wp
1048	ENDIF
1049	!
1050	!-- v-component
1051	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1052	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1053	fxm(j,i) = 0.0_wp
1054	fxp(j,i) = 1.0_wp
1055	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1056	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1057	fxm(j,i) = 1.0_wp
1058	fxp(j,i) = 0.0_wp
1059	ENDIF
1060	!
1061	!-- w-component, also used for scalars, separate arrays for shear
1062	!-- production of tke
1063	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1064	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1065	wall_w_y(j,i) = 1.0_wp
1066	fwym(j,i) = 0.0_wp
1067	fwyp(j,i) = 1.0_wp
1068	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1069	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1070	wall_w_y(j,i) = 1.0_wp
1071	fwym(j,i) = 1.0_wp
1072	fwyp(j,i) = 0.0_wp
1073	ENDIF
1074	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1075	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1076	wall_w_x(j,i) = 1.0_wp
1077	fwxm(j,i) = 0.0_wp
1078	fwxp(j,i) = 1.0_wp
1079	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1080	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1081	wall_w_x(j,i) = 1.0_wp
1082	fwxm(j,i) = 1.0_wp
1083	fwxp(j,i) = 0.0_wp
1084	ENDIF
1085	!
1086	!-- Wall and corner locations inside buildings for limitation of
1087	!-- near-wall mixing length l_wall
1088	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1089
1090	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1091
1092	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1093	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1094	nzb_s_inner(j,i-1) ) + 1
1095	ENDIF
1096
1097	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1098	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1099	nzb_s_inner(j,i+1) ) + 1
1100	ENDIF
1101
1102	ENDIF
1103
1104	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1105
1106	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1107	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1108	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1109	nzb_s_inner(j,i-1) ) + 1
1110	ENDIF
1111
1112	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1113	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1114	nzb_s_inner(j,i+1) ) + 1
1115	ENDIF
1116
1117	ENDIF
1118
1119	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1120	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1121	ENDIF
1122
1123	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1124	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1125	ENDIF
1126
1127	ENDDO
1128	ENDDO
1129
1130	!
1131	!-- Calculate wall flag arrays for the multigrid method.
1132	!-- Please note, wall flags are only applied in the not cache-optimized
1133	!-- version.
1134	IF ( psolver == 'multigrid_noopt' ) THEN
1135	!
1136	!-- Gridpoint increment of the current level
1137	inc = 1
1138
1139	DO l = maximum_grid_level, 1 , -1
1140
1141	nxl_l = nxl_mg(l)
1142	nxr_l = nxr_mg(l)
1143	nys_l = nys_mg(l)
1144	nyn_l = nyn_mg(l)
1145	nzt_l = nzt_mg(l)
1146
1147	!
1148	!-- Assign the flag level to be calculated
1149	SELECT CASE ( l )
1150	CASE ( 1 )
1151	flags => wall_flags_1
1152	CASE ( 2 )
1153	flags => wall_flags_2
1154	CASE ( 3 )
1155	flags => wall_flags_3
1156	CASE ( 4 )
1157	flags => wall_flags_4
1158	CASE ( 5 )
1159	flags => wall_flags_5
1160	CASE ( 6 )
1161	flags => wall_flags_6
1162	CASE ( 7 )
1163	flags => wall_flags_7
1164	CASE ( 8 )
1165	flags => wall_flags_8
1166	CASE ( 9 )
1167	flags => wall_flags_9
1168	CASE ( 10 )
1169	flags => wall_flags_10
1170	END SELECT
1171
1172	!
1173	!-- Depending on the grid level, set the respective bits in case of
1174	!-- neighbouring walls
1175	!-- Bit 0: wall to the bottom
1176	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1177	!-- Bit 2: wall to the south
1178	!-- Bit 3: wall to the north
1179	!-- Bit 4: wall to the left
1180	!-- Bit 5: wall to the right
1181	!-- Bit 6: inside building
1182
1183	flags = 0
1184
1185	!
1186	!-- In case of masking method, flags are not set and multigrid method
1187	!-- works like FFT-solver
1188	IF ( .NOT. masking_method ) THEN
1189
1190	DO i = nxl_l-1, nxr_l+1
1191	DO j = nys_l-1, nyn_l+1
1192	DO k = nzb, nzt_l+1
1193
1194	!
1195	!-- Inside/outside building (inside building does not need
1196	!-- further tests for walls)
1197	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1198
1199	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1200
1201	ELSE
1202	!
1203	!-- Bottom wall
1204	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1205	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1206	ENDIF
1207	!
1208	!-- South wall
1209	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1210	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1211	ENDIF
1212	!
1213	!-- North wall
1214	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1215	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1216	ENDIF
1217	!
1218	!-- Left wall
1219	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1220	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1221	ENDIF
1222	!
1223	!-- Right wall
1224	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1225	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1226	ENDIF
1227
1228	ENDIF
1229
1230	ENDDO
1231	ENDDO
1232	ENDDO
1233
1234	ENDIF
1235
1236	!
1237	!-- Test output of flag arrays
1238	! i = nxl_l
1239	! WRITE (9,*) ' '
1240	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1241	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1242	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1243	! DO k = nzt_l+1, nzb, -1
1244	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1245	! ENDDO
1246
1247	inc = inc * 2
1248
1249	ENDDO
1250
1251	ENDIF
1252	!
1253	!-- Allocate flags needed for masking walls.
1254	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1255	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1256	wall_flags_0 = 0
1257	wall_flags_00 = 0
1258
1259	IF ( scalar_advec == 'ws-scheme' .OR. &
1260	scalar_advec == 'ws-scheme-mono' ) THEN
1261	!
1262	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1263	!-- near topography, inflow- and outflow boundaries as well as bottom and
1264	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1265	!-- grid points.
1266	DO i = nxl, nxr
1267	DO j = nys, nyn
1268	DO k = nzb_s_inner(j,i)+1, nzt
1269	!
1270	!-- scalar - x-direction
1271	!-- WS1 (0), WS3 (1), WS5 (2)
1272	IF ( ( k <= nzb_s_inner(j,i+1) .OR. k <= nzb_s_inner(j,i+2) &
1273	.OR. k <= nzb_s_inner(j,i-1) ) &
1274	.OR. ( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1275	.AND. i == nxl ) .OR. &
1276	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1277	.AND. i == nxr ) ) &
1278	THEN
1279	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1280	ELSEIF ( ( k <= nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i+1)&
1281	.AND. k > nzb_s_inner(j,i+2)&
1282	.AND. k > nzb_s_inner(j,i-1)&
1283	) .OR. &
1284	( k <= nzb_s_inner(j,i-2) .AND. k > nzb_s_inner(j,i+1)&
1285	.AND. k > nzb_s_inner(j,i+2)&
1286	.AND. k > nzb_s_inner(j,i-1)&
1287	) &
1288	.OR. &
1289	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1290	.AND. i == nxr-1 ) .OR. &
1291	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1292	.AND. i == nxlu ) ) &
1293	THEN
1294	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1295	ELSEIF ( k > nzb_s_inner(j,i+1) .AND. k > nzb_s_inner(j,i+2) &
1296	.AND. k > nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i-1) &
1297	.AND. k > nzb_s_inner(j,i-2) ) &
1298	THEN
1299	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1300	ENDIF
1301	!
1302	!-- scalar - y-direction
1303	!-- WS1 (3), WS3 (4), WS5 (5)
1304	IF ( ( k <= nzb_s_inner(j+1,i) .OR. k <= nzb_s_inner(j+2,i) &
1305	.OR. k <= nzb_s_inner(j-1,i) ) &
1306	.OR. &
1307	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1308	.AND. j == nys ) .OR. &
1309	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1310	.AND. j == nyn ) ) &
1311	THEN
1312	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1313	!
1314	!-- WS3
1315	ELSEIF ( ( k <= nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j+1,i)&
1316	.AND. k > nzb_s_inner(j+2,i)&
1317	.AND. k > nzb_s_inner(j-1,i)&
1318	) .OR. &
1319	( k <= nzb_s_inner(j-2,i) .AND. k > nzb_s_inner(j+1,i)&
1320	.AND. k > nzb_s_inner(j+2,i)&
1321	.AND. k > nzb_s_inner(j-1,i)&
1322	) &
1323	.OR. &
1324	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1325	.AND. j == nysv ) .OR. &
1326	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1327	.AND. j == nyn-1 ) ) &
1328	THEN
1329	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1330	!
1331	!-- WS5
1332	ELSEIF ( k > nzb_s_inner(j+1,i) .AND. k > nzb_s_inner(j+2,i) &
1333	.AND. k > nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j-1,i) &
1334	.AND. k > nzb_s_inner(j-2,i) ) &
1335	THEN
1336	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1337	ENDIF
1338	!
1339	!-- scalar - z-direction
1340	!-- WS1 (6), WS3 (7), WS5 (8)
1341	flag_set = .FALSE.
1342	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1343	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1344	flag_set = .TRUE.
1345	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1346	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1347	flag_set = .TRUE.
1348	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1349	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1350	ENDIF
1351
1352	ENDDO
1353	ENDDO
1354	ENDDO
1355	ENDIF
1356
1357	IF ( momentum_advec == 'ws-scheme' ) THEN
1358	!
1359	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1360	!-- near topography, inflow- and outflow boundaries as well as bottom and
1361	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1362	!-- grid points.
1363	DO i = nxl, nxr
1364	DO j = nys, nyn
1365	DO k = nzb+1, nzt
1366	!
1367	!-- At first, set flags to WS1.
1368	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1369	!-- in order to handle the left/south flux.
1370	!-- near vertical walls.
1371	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1372	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1373	!
1374	!-- u component - x-direction
1375	!-- WS1 (9), WS3 (10), WS5 (11)
1376	IF ( k <= nzb_u_inner(j,i+1) .OR. &
1377	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1378	.AND. i <= nxlu ) .OR. &
1379	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1380	.AND. i == nxr ) ) &
1381	THEN
1382	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1383	ELSEIF ( ( k <= nzb_u_inner(j,i+2) .AND. &
1384	k > nzb_u_inner(j,i+1) ) .OR. &
1385	k <= nzb_u_inner(j,i-1) &
1386	.OR. &
1387	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1388	.AND. i == nxr-1 ) .OR. &
1389	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1390	.AND. i == nxlu+1) ) &
1391	THEN
1392	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1393	!
1394	!-- Clear flag for WS1
1395	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1396	ELSEIF ( k > nzb_u_inner(j,i+1) .AND. k > nzb_u_inner(j,i+2) &
1397	.AND. k > nzb_u_inner(j,i-1) ) &
1398	THEN
1399	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1400	!
1401	!-- Clear flag for WS1
1402	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
1403	ENDIF
1404	!
1405	!-- u component - y-direction
1406	!-- WS1 (12), WS3 (13), WS5 (14)
1407	IF ( k <= nzb_u_inner(j+1,i) .OR. &
1408	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1409	.AND. j == nys ) .OR. &
1410	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1411	.AND. j == nyn ) ) &
1412	THEN
1413	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1414	ELSEIF ( ( k <= nzb_u_inner(j+2,i) .AND. &
1415	k > nzb_u_inner(j+1,i) ) .OR. &
1416	k <= nzb_u_inner(j-1,i) &
1417	.OR. &
1418	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1419	.AND. j == nysv ) .OR. &
1420	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1421	.AND. j == nyn-1 ) ) &
1422	THEN
1423	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1424	!
1425	!-- Clear flag for WS1
1426	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1427	ELSEIF ( k > nzb_u_inner(j+1,i) .AND. k > nzb_u_inner(j+2,i) &
1428	.AND. k > nzb_u_inner(j-1,i) ) &
1429	THEN
1430	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1431	!
1432	!-- Clear flag for WS1
1433	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
1434	ENDIF
1435	!
1436	!-- u component - z-direction
1437	!-- WS1 (15), WS3 (16), WS5 (17)
1438	flag_set = .FALSE.
1439	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1440	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1441	flag_set = .TRUE.
1442	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1443	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1444	flag_set = .TRUE.
1445	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1446	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1447	ENDIF
1448
1449	ENDDO
1450	ENDDO
1451	ENDDO
1452
1453	DO i = nxl, nxr
1454	DO j = nys, nyn
1455	DO k = nzb+1, nzt
1456	!
1457	!-- At first, set flags to WS1.
1458	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1459	!-- in order to handle the left/south flux.
1460	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1461	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1462	!
1463	!-- v component - x-direction
1464	!-- WS1 (18), WS3 (19), WS5 (20)
1465	IF ( k <= nzb_v_inner(j,i+1) .OR. &
1466	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1467	.AND. i == nxl ) .OR. &
1468	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1469	.AND. i == nxr ) ) &
1470	THEN
1471	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1472	!
1473	!-- WS3
1474	ELSEIF ( ( k <= nzb_v_inner(j,i+2) .AND. &
1475	k > nzb_v_inner(j,i+1) ) .OR. &
1476	k <= nzb_v_inner(j,i-1) &
1477	.OR. &
1478	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1479	.AND. i == nxr-1 ) .OR. &
1480	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1481	.AND. i == nxlu ) ) &
1482	THEN
1483	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1484	!
1485	!-- Clear flag for WS1
1486	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1487	ELSEIF ( k > nzb_v_inner(j,i+1) .AND. k > nzb_v_inner(j,i+2) &
1488	.AND. k > nzb_v_inner(j,i-1) ) &
1489	THEN
1490	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1491	!
1492	!-- Clear flag for WS1
1493	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
1494	ENDIF
1495	!
1496	!-- v component - y-direction
1497	!-- WS1 (21), WS3 (22), WS5 (23)
1498	IF ( k <= nzb_v_inner(j+1,i) .OR. &
1499	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1500	.AND. j <= nysv ) .OR. &
1501	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1502	.AND. j == nyn ) ) &
1503	THEN
1504	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1505	ELSEIF ( ( k <= nzb_v_inner(j+2,i) .AND. &
1506	k > nzb_v_inner(j+1,i) ) .OR. &
1507	k <= nzb_v_inner(j-1,i) &
1508	.OR. &
1509	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1510	.AND. j == nysv+1) .OR. &
1511	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1512	.AND. j == nyn-1 ) ) &
1513	THEN
1514	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1515	!
1516	!-- Clear flag for WS1
1517	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1518	ELSEIF ( k > nzb_v_inner(j+1,i) .AND. k > nzb_v_inner(j+2,i) &
1519	.AND. k > nzb_v_inner(j-1,i) ) &
1520	THEN
1521	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1522	!
1523	!-- Clear flag for WS1
1524	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
1525	ENDIF
1526	!
1527	!-- v component - z-direction
1528	!-- WS1 (24), WS3 (25), WS5 (26)
1529	flag_set = .FALSE.
1530	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1531	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1532	flag_set = .TRUE.
1533	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1534	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1535	flag_set = .TRUE.
1536	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1537	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1538	ENDIF
1539
1540	ENDDO
1541	ENDDO
1542	ENDDO
1543	DO i = nxl, nxr
1544	DO j = nys, nyn
1545	DO k = nzb+1, nzt
1546	!
1547	!-- At first, set flags to WS1.
1548	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
1549	!-- in order to handle the left/south flux.
1550	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1551	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1552	!
1553	!-- w component - x-direction
1554	!-- WS1 (27), WS3 (28), WS5 (29)
1555	IF ( k <= nzb_w_inner(j,i+1) .OR. &
1556	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1557	.AND. i == nxl ) .OR. &
1558	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1559	.AND. i == nxr ) ) &
1560	THEN
1561	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1562	ELSEIF ( ( k <= nzb_w_inner(j,i+2) .AND. &
1563	k > nzb_w_inner(j,i+1) ) .OR. &
1564	k <= nzb_w_inner(j,i-1) &
1565	.OR. &
1566	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
1567	.AND. i == nxr-1 ) .OR. &
1568	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
1569	.AND. i == nxlu ) ) &
1570	THEN
1571	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1572	!
1573	!-- Clear flag for WS1
1574	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1575	ELSEIF ( k > nzb_w_inner(j,i+1) .AND. k > nzb_w_inner(j,i+2) &
1576	.AND. k > nzb_w_inner(j,i-1) ) &
1577	THEN
1578	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1579	!
1580	!-- Clear flag for WS1
1581	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
1582	ENDIF
1583	!
1584	!-- w component - y-direction
1585	!-- WS1 (30), WS3 (31), WS5 (32)
1586	IF ( k <= nzb_w_inner(j+1,i) .OR. &
1587	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1588	.AND. j == nys ) .OR. &
1589	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1590	.AND. j == nyn ) ) &
1591	THEN
1592	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1593	ELSEIF ( ( k <= nzb_w_inner(j+2,i) .AND. &
1594	k > nzb_w_inner(j+1,i) ) .OR. &
1595	k <= nzb_w_inner(j-1,i) &
1596	.OR. &
1597	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
1598	.AND. j == nysv ) .OR. &
1599	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
1600	.AND. j == nyn-1 ) ) &
1601	THEN
1602	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1603	!
1604	!-- Clear flag for WS1
1605	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1606	ELSEIF ( k > nzb_w_inner(j+1,i) .AND. k > nzb_w_inner(j+2,i) &
1607	.AND. k > nzb_w_inner(j-1,i) ) &
1608	THEN
1609	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
1610	!
1611	!-- Clear flag for WS1
1612	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
1613	ENDIF
1614	!
1615	!-- w component - z-direction
1616	!-- WS1 (33), WS3 (34), WS5 (35)
1617	flag_set = .FALSE.
1618	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1619	.OR. k == nzt ) THEN
1620	!
1621	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1622	!-- set, although this is not a prognostic level. However,
1623	!-- contrary to the advection of u,v and s this is necessary
1624	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1625	!-- at k == nzb_w_inner(j,i)+1.
1626	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
1627	flag_set = .TRUE.
1628	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1629	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
1630	flag_set = .TRUE.
1631	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1632	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
1633	ENDIF
1634
1635	ENDDO
1636	ENDDO
1637	ENDDO
1638
1639	ENDIF
1640
1641	!
1642	!-- Exchange 3D integer wall_flags.
1643	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
1644	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
1645	!
1646	!-- Exchange ghost points for advection flags
1647	CALL exchange_horiz_int( wall_flags_0, nbgp )
1648	CALL exchange_horiz_int( wall_flags_00, nbgp )
1649	!
1650	!-- Set boundary flags at inflow and outflow boundary in case of
1651	!-- non-cyclic boundary conditions.
1652	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1653	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
1654	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
1655	ENDIF
1656
1657	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
1658	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
1659	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
1660	ENDIF
1661
1662	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
1663	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
1664	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
1665	ENDIF
1666
1667	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1668	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
1669	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
1670	ENDIF
1671
1672	ENDIF
1673
1674	!
1675	!-- In case of topography: limit near-wall mixing length l_wall further:
1676	!-- Go through all points of the subdomain one by one and look for the closest
1677	!-- surface
1678	IF ( TRIM(topography) /= 'flat' ) THEN
1679	DO i = nxl, nxr
1680	DO j = nys, nyn
1681
1682	nzb_si = nzb_s_inner(j,i)
1683	vi = vertical_influence(nzb_si)
1684
1685	IF ( wall_n(j,i) > 0 ) THEN
1686	!
1687	!-- North wall (y distance)
1688	DO k = wall_n(j,i), nzb_si
1689	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1690	ENDDO
1691	!
1692	!-- Above North wall (yz distance)
1693	DO k = nzb_si + 1, nzb_si + vi
1694	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1695	SQRT( 0.25_wp * dy**2 + &
1696	( zu(k) - zw(nzb_si) )**2 ) )
1697	ENDDO
1698	!
1699	!-- Northleft corner (xy distance)
1700	IF ( corner_nl(j,i) > 0 ) THEN
1701	DO k = corner_nl(j,i), nzb_si
1702	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1703	0.5_wp * SQRT( dx2 + dy2 ) )
1704	ENDDO
1705	!
1706	!-- Above Northleft corner (xyz distance)
1707	DO k = nzb_si + 1, nzb_si + vi
1708	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1709	SQRT( 0.25_wp * (dx2 + dy2) + &
1710	( zu(k) - zw(nzb_si) )**2 ) )
1711	ENDDO
1712	ENDIF
1713	!
1714	!-- Northright corner (xy distance)
1715	IF ( corner_nr(j,i) > 0 ) THEN
1716	DO k = corner_nr(j,i), nzb_si
1717	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1718	0.5_wp * SQRT( dx2 + dy2 ) )
1719	ENDDO
1720	!
1721	!-- Above northright corner (xyz distance)
1722	DO k = nzb_si + 1, nzb_si + vi
1723	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1724	SQRT( 0.25_wp * (dx2 + dy2) + &
1725	( zu(k) - zw(nzb_si) )**2 ) )
1726	ENDDO
1727	ENDIF
1728	ENDIF
1729
1730	IF ( wall_s(j,i) > 0 ) THEN
1731	!
1732	!-- South wall (y distance)
1733	DO k = wall_s(j,i), nzb_si
1734	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1735	ENDDO
1736	!
1737	!-- Above south wall (yz distance)
1738	DO k = nzb_si + 1, nzb_si + vi
1739	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1740	SQRT( 0.25_wp * dy**2 + &
1741	( zu(k) - zw(nzb_si) )**2 ) )
1742	ENDDO
1743	!
1744	!-- Southleft corner (xy distance)
1745	IF ( corner_sl(j,i) > 0 ) THEN
1746	DO k = corner_sl(j,i), nzb_si
1747	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1748	0.5_wp * SQRT( dx2 + dy2 ) )
1749	ENDDO
1750	!
1751	!-- Above southleft corner (xyz distance)
1752	DO k = nzb_si + 1, nzb_si + vi
1753	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1754	SQRT( 0.25_wp * (dx2 + dy2) + &
1755	( zu(k) - zw(nzb_si) )**2 ) )
1756	ENDDO
1757	ENDIF
1758	!
1759	!-- Southright corner (xy distance)
1760	IF ( corner_sr(j,i) > 0 ) THEN
1761	DO k = corner_sr(j,i), nzb_si
1762	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1763	0.5_wp * SQRT( dx2 + dy2 ) )
1764	ENDDO
1765	!
1766	!-- Above southright corner (xyz distance)
1767	DO k = nzb_si + 1, nzb_si + vi
1768	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1769	SQRT( 0.25_wp * (dx2 + dy2) + &
1770	( zu(k) - zw(nzb_si) )**2 ) )
1771	ENDDO
1772	ENDIF
1773
1774	ENDIF
1775
1776	IF ( wall_l(j,i) > 0 ) THEN
1777	!
1778	!-- Left wall (x distance)
1779	DO k = wall_l(j,i), nzb_si
1780	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1781	ENDDO
1782	!
1783	!-- Above left wall (xz distance)
1784	DO k = nzb_si + 1, nzb_si + vi
1785	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1786	SQRT( 0.25_wp * dx**2 + &
1787	( zu(k) - zw(nzb_si) )**2 ) )
1788	ENDDO
1789	ENDIF
1790
1791	IF ( wall_r(j,i) > 0 ) THEN
1792	!
1793	!-- Right wall (x distance)
1794	DO k = wall_r(j,i), nzb_si
1795	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1796	ENDDO
1797	!
1798	!-- Above right wall (xz distance)
1799	DO k = nzb_si + 1, nzb_si + vi
1800	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1801	SQRT( 0.25_wp * dx**2 + &
1802	( zu(k) - zw(nzb_si) )**2 ) )
1803	ENDDO
1804
1805	ENDIF
1806
1807	ENDDO
1808	ENDDO
1809
1810	ENDIF
1811
1812	!
1813	!-- Multiplication with wall_adjustment_factor
1814	l_wall = wall_adjustment_factor * l_wall
1815
1816	!
1817	!-- Set lateral boundary conditions for l_wall
1818	CALL exchange_horiz( l_wall, nbgp )
1819
1820	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1821	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1822
1823
1824	END SUBROUTINE init_grid

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