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source: palm/trunk/SOURCE/init_grid.f90 @ 2088

Last change on this file since 2088 was 2088, checked in by suehring, 7 years ago
Bugfixes in initial salinity profile and generic topography definition in case of ocean simulations
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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
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2016 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	! Bugfix in generic topography in case of ocean simulations
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: init_grid.f90 2088 2016-12-19 16:30:25Z suehring $
27	!
28	! 2037 2016-10-26 11:15:40Z knoop
29	! Anelastic approximation implemented
30	!
31	! 2021 2016-10-07 14:08:57Z suehring
32	! Bugfix: setting Neumann boundary conditions for topography required for
33	! topography flags in multigrid_noopt solver
34	!
35	! 2000 2016-08-20 18:09:15Z knoop
36	! Forced header and separation lines into 80 columns
37	!
38	! 1994 2016-08-15 09:52:21Z suehring
39	! Bugfix in definition of generic topography
40	!
41	! 1982 2016-08-01 11:04:48Z suehring
42	! Bugfix concering consistency check for topography
43	!
44	! 1968 2016-07-18 12:01:49Z suehring
45	! Changed: PE-wise reading of topography file in order to avoid global definition
46	! of arrays nzb_local and nzb_tmp. Thereby, topography definition for single
47	! buildings and street canyons has changed, as well as flag setting for
48	! multigrid scheme.
49	!
50	! Bugfix in checking l_grid anisotropy.
51	! Simplify initial computation of lwall and vertical_influence, i.e. remove
52	! nzb_s_inner as it is still zero at this point.
53	!
54	! 1942 2016-06-14 12:18:18Z suehring
55	! Topography filter implemented to fill holes resolved by only one grid point.
56	! Initialization of flags for ws-scheme moved to advec_ws.
57	!
58	! 1931 2016-06-10 12:06:59Z suehring
59	! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid
60	!
61	! 1910 2016-05-26 06:49:46Z raasch
62	! Bugfix: if topography is read from file, Neumann conditions are used for the
63	! nzb_local array (instead of cyclic conditions) in case that non-cyclic
64	! boundary conditions are switched on for the run
65	!
66	! 1902 2016-05-09 11:18:56Z suehring
67	! Set topography flags for multigrid solver only (not for multigrid_fast)
68	!
69	! 1886 2016-04-21 11:20:47Z suehring
70	! Bugfix: setting advection flags near walls
71	! reformulated index values for nzb_v_inner
72	! variable discriptions added in declaration block
73	!
74	! 1845 2016-04-08 08:29:13Z raasch
75	! nzb_2d removed
76	!
77	! 1804 2016-04-05 16:30:18Z maronga
78	! Removed code for parameter file check (__check)
79	!
80	! 1779 2016-03-03 08:01:28Z raasch
81	! coupling_char is trimmed at every place it occurs, because it can have
82	! different length now
83	!
84	! 1762 2016-02-25 12:31:13Z hellstea
85	! Introduction of nested domain feature
86	!
87	! 1743 2016-01-13 10:23:51Z raasch
88	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
89	! total domain
90	!
91	! 1691 2015-10-26 16:17:44Z maronga
92	! Renamed prandtl_layer to constant_flux_layer.
93	!
94	! 1682 2015-10-07 23:56:08Z knoop
95	! Code annotations made doxygen readable
96	!
97	! 1677 2015-10-02 13:25:23Z boeske
98	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
99	!
100	! 1675 2015-10-02 08:28:59Z gronemeier
101	! Bugfix: Definition of topography grid levels
102	!
103	! 1660 2015-09-21 08:15:16Z gronemeier
104	! Bugfix: Definition of topography grid levels if vertical grid stretching
105	! starts below the maximum topography height.
106	!
107	! 1580 2015-04-10 13:43:49Z suehring
108	! Bugfix: setting flags for 5th order scheme near buildings
109	!
110	! 1575 2015-03-27 09:56:27Z raasch
111	! adjustments for psolver-queries
112	!
113	! 1557 2015-03-05 16:43:04Z suehring
114	! Adjustment for monotoinic limiter
115	!
116	! 1418 2014-06-06 13:05:08Z fricke
117	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
118	! condition and a negative value for dz_stretch_level the condition
119	! was always true for the whole model domain
120	!
121	! 1409 2014-05-23 12:11:32Z suehring
122	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
123	! j <= nysv
124	!
125	! 1353 2014-04-08 15:21:23Z heinze
126	! REAL constants provided with KIND-attribute
127	!
128	! 1322 2014-03-20 16:38:49Z raasch
129	! REAL constants defined as wp-kind
130	!
131	! 1320 2014-03-20 08:40:49Z raasch
132	! ONLY-attribute added to USE-statements,
133	! kind-parameters added to all INTEGER and REAL declaration statements,
134	! kinds are defined in new module kinds,
135	! revision history before 2012 removed,
136	! comment fields (!:) to be used for variable explanations added to
137	! all variable declaration statements
138	!
139	! 1221 2013-09-10 08:59:13Z raasch
140	! wall_flags_00 introduced to hold bits 32-63,
141	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
142	! loops optimized for openACC (pres + flow_statistics)
143	!
144	! 1092 2013-02-02 11:24:22Z raasch
145	! unused variables removed
146	!
147	! 1069 2012-11-28 16:18:43Z maronga
148	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
149	! ocean model in case of coupled runs
150	!
151	! 1036 2012-10-22 13:43:42Z raasch
152	! code put under GPL (PALM 3.9)
153	!
154	! 1015 2012-09-27 09:23:24Z raasch
155	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
156	! nzb_w_inner+1
157	!
158	! 996 2012-09-07 10:41:47Z raasch
159	! little reformatting
160	!
161	! 978 2012-08-09 08:28:32Z fricke
162	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
163	! Bugfix: Set wall_flags_0 for inflow boundary
164	!
165	! 927 2012-06-06 19:15:04Z raasch
166	! Wall flags are not set for multigrid method in case of masking method
167	!
168	! 864 2012-03-27 15:10:33Z gryschka
169	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
170	! were not correctly defined for k=1.
171	!
172	! 861 2012-03-26 14:18:34Z suehring
173	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
174	! inflow and outflow boundaries as well as near the bottom and the top of the
175	! model domain.!
176	! Initialization of nzb_s_inner and nzb_w_inner.
177	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
178	! while setting wall_flags_0
179	!
180	! 843 2012-02-29 15:16:21Z gryschka
181	! In case of ocean and dirichlet bc for u and v at the bottom
182	! the first u-level ist defined at same height as the first w-level
183	!
184	! 818 2012-02-08 16:11:23Z maronga
185	! Bugfix: topo_height is only required if topography is used. It is thus now
186	! allocated in the topography branch
187	!
188	! 809 2012-01-30 13:32:58Z maronga
189	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
190	!
191	! 807 2012-01-25 11:53:51Z maronga
192	! New cpp directive "__check" implemented which is used by check_namelist_files
193	!
194	! Revision 1.1 1997/08/11 06:17:45 raasch
195	! Initial revision (Testversion)
196	!
197	!
198	! Description:
199	! ------------
200	!> Creating grid depending constants
201	!------------------------------------------------------------------------------!
202	SUBROUTINE init_grid
203
204	USE advec_ws, &
205	ONLY: ws_init_flags
206
207	USE arrays_3d, &
208	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
209	f2_mg, f3_mg, l_grid, l_wall, zu, zw
210
211	USE control_parameters, &
212	ONLY: bc_lr_cyc, bc_ns_cyc, building_height, building_length_x, &
213	building_length_y, building_wall_left, building_wall_south, &
214	canyon_height, canyon_wall_left, canyon_wall_south, &
215	canyon_width_x, canyon_width_y, constant_flux_layer, &
216	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
217	dz_stretch_level, dz_stretch_level_index, grid_level, ibc_uv_b, &
218	io_blocks, io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
219	masking_method, maximum_grid_level, message_string, &
220	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
221	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
222	outflow_r, outflow_s, psolver, scalar_advec, topography, &
223	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
224	wall_adjustment_factor
225
226	USE grid_variables, &
227	ONLY: ddx, ddx2, ddy, ddy2, dx, dx2, dy, dy2, fwxm, &
228	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
229	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
230
231	USE indices, &
232	ONLY: flags, nbgp, nx, nxl, nxlg, nxl_mg, nxr, nxrg, nxr_mg, &
233	ny, nyn, nyng, nyn_mg, nys, nys_mg, nysg, nz, nzb, &
234	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
235	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
236	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
237	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
238	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
239	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
240	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
241	wall_flags_9
242
243	USE kinds
244
245	USE pegrid
246
247	IMPLICIT NONE
248
249	INTEGER(iwp) :: bh !< temporary vertical index of building height
250	INTEGER(iwp) :: blx !< grid point number of building size along x
251	INTEGER(iwp) :: bly !< grid point number of building size along y
252	INTEGER(iwp) :: bxl !< index for left building wall
253	INTEGER(iwp) :: bxr !< index for right building wall
254	INTEGER(iwp) :: byn !< index for north building wall
255	INTEGER(iwp) :: bys !< index for south building wall
256	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
257	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
258	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
259	INTEGER(iwp) :: cxl !< index for left canyon wall
260	INTEGER(iwp) :: cxr !< index for right canyon wall
261	INTEGER(iwp) :: cyn !< index for north canyon wall
262	INTEGER(iwp) :: cys !< index for south canyon wall
263	INTEGER(iwp) :: i !< index variable along x
264	INTEGER(iwp) :: ii !< loop variable for reading topography file
265	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
266	INTEGER(iwp) :: j !< index variable along y
267	INTEGER(iwp) :: k !< index variable along z
268	INTEGER(iwp) :: l !< loop variable
269	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
270	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
271	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
272	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
273	INTEGER(iwp) :: nzb_local_max !< vertical grid index of maximum topography height
274	INTEGER(iwp) :: nzb_local_min !< vertical grid index of minimum topography height
275	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
276	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
277	INTEGER(iwp) :: num_hole !< number of holes (in topography) resolved by only one grid point
278	INTEGER(iwp) :: num_hole_l !< number of holes (in topography) resolved by only one grid point on local PE
279	INTEGER(iwp) :: num_wall !< number of surrounding vertical walls for a single grid point
280	INTEGER(iwp) :: skip_n_rows !< counting variable to skip rows while reading topography file
281	INTEGER(iwp) :: vi !< dummy for vertical influence
282
283	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
284	vertical_influence !< number of vertical grid points above obstacle where adjustment of near-wall mixing length is required
285
286	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of north-left corner location to limit near-wall mixing length
287	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
288	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
289	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
290	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography top at cell-center
291	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate topography indices on u- and v-grid
292	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to adjacent left-facing wall
293	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
294	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
295	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
296
297	REAL(wp) :: dum !< dummy variable to skip columns while reading topography file
298	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
299
300	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for topography height
301	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zu_s_inner_l !< dummy array on global scale to write topography output array
302	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zw_w_inner_l !< dummy array on global scale to write topography output array
303
304
305	!
306	!-- Calculation of horizontal array bounds including ghost layers
307	nxlg = nxl - nbgp
308	nxrg = nxr + nbgp
309	nysg = nys - nbgp
310	nyng = nyn + nbgp
311
312	!
313	!-- Allocate grid arrays
314	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
315	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
316
317	!
318	!-- Compute height of u-levels from constant grid length and dz stretch factors
319	IF ( dz == -1.0_wp ) THEN
320	message_string = 'missing dz'
321	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
322	ELSEIF ( dz <= 0.0_wp ) THEN
323	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
324	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
325	ENDIF
326
327	!
328	!-- Define the vertical grid levels
329	IF ( .NOT. ocean ) THEN
330	!
331	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
332	!-- The second u-level (k=1) corresponds to the top of the
333	!-- Prandtl-layer.
334
335	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
336	zu(0) = 0.0_wp
337	! zu(0) = - dz * 0.5_wp
338	ELSE
339	zu(0) = - dz * 0.5_wp
340	ENDIF
341	zu(1) = dz * 0.5_wp
342
343	dz_stretch_level_index = nzt+1
344	dz_stretched = dz
345	DO k = 2, nzt+1
346	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
347	dz_stretched = dz_stretched * dz_stretch_factor
348	dz_stretched = MIN( dz_stretched, dz_max )
349	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
350	ENDIF
351	zu(k) = zu(k-1) + dz_stretched
352	ENDDO
353
354	!
355	!-- Compute the w-levels. They are always staggered half-way between the
356	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
357	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
358	!-- The top w-level is extrapolated linearly.
359	zw(0) = 0.0_wp
360	DO k = 1, nzt
361	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
362	ENDDO
363	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
364
365	ELSE
366	!
367	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
368	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
369	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
370	!-- w-level are defined at same height, but staggered from the second level.
371	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
372	zu(nzt+1) = dz * 0.5_wp
373	zu(nzt) = - dz * 0.5_wp
374
375	dz_stretch_level_index = 0
376	dz_stretched = dz
377	DO k = nzt-1, 0, -1
378	!
379	!-- The default value of dz_stretch_level is positive, thus the first
380	!-- condition is always true. Hence, the second condition is necessary.
381	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
382	.AND. dz_stretched < dz_max ) THEN
383	dz_stretched = dz_stretched * dz_stretch_factor
384	dz_stretched = MIN( dz_stretched, dz_max )
385	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
386	ENDIF
387	zu(k) = zu(k+1) - dz_stretched
388	ENDDO
389
390	!
391	!-- Compute the w-levels. They are always staggered half-way between the
392	!-- corresponding u-levels, except in case of dirichlet bc for u and v
393	!-- at the ground. In this case the first u- and w-level are defined at
394	!-- same height. The top w-level (nzt+1) is not used but set for
395	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
396	zw(nzt+1) = dz
397	zw(nzt) = 0.0_wp
398	DO k = 0, nzt
399	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
400	ENDDO
401
402	!
403	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
404	!-- at same height.
405	IF ( ibc_uv_b == 0 ) THEN
406	zu(0) = zw(0)
407	ENDIF
408
409	ENDIF
410
411	!
412	!-- Compute grid lengths.
413	DO k = 1, nzt+1
414	dzu(k) = zu(k) - zu(k-1)
415	ddzu(k) = 1.0_wp / dzu(k)
416	dzw(k) = zw(k) - zw(k-1)
417	ddzw(k) = 1.0_wp / dzw(k)
418	ENDDO
419
420	DO k = 1, nzt
421	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
422	ENDDO
423
424	!
425	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
426	!-- everywhere. For the actual grid, the grid spacing at the lowest level
427	!-- is only dz/2, but should be dz. Therefore, an additional array
428	!-- containing with appropriate grid information is created for these
429	!-- solvers.
430	IF ( psolver(1:9) /= 'multigrid' ) THEN
431	ALLOCATE( ddzu_pres(1:nzt+1) )
432	ddzu_pres = ddzu
433	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
434	ENDIF
435
436	!
437	!-- Compute the reciprocal values of the horizontal grid lengths.
438	ddx = 1.0_wp / dx
439	ddy = 1.0_wp / dy
440	dx2 = dx * dx
441	dy2 = dy * dy
442	ddx2 = 1.0_wp / dx2
443	ddy2 = 1.0_wp / dy2
444
445	!
446	!-- Compute the grid-dependent mixing length.
447	DO k = 1, nzt
448	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
449	ENDDO
450
451	!
452	!-- Allocate outer and inner index arrays for topography and set
453	!-- defaults.
454
455	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
456	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
457	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
458	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
459
460	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
461	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
462	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
463	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
464	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
465	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
466	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
467	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
468	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
469	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
470	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
471	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
472	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
473	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
474	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
475	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
476	nzb_local(nysg:nyng,nxlg:nxrg), &
477	nzb_tmp(nysg:nyng,nxlg:nxrg), &
478	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
479	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
480	wall_e_x(nysg:nyng,nxlg:nxrg), &
481	wall_e_y(nysg:nyng,nxlg:nxrg), &
482	wall_u(nysg:nyng,nxlg:nxrg), &
483	wall_v(nysg:nyng,nxlg:nxrg), &
484	wall_w_x(nysg:nyng,nxlg:nxrg), &
485	wall_w_y(nysg:nyng,nxlg:nxrg) )
486
487
488
489	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
490
491
492	nzb_s_inner = nzb; nzb_s_outer = nzb
493	nzb_u_inner = nzb; nzb_u_outer = nzb
494	nzb_v_inner = nzb; nzb_v_outer = nzb
495	nzb_w_inner = nzb; nzb_w_outer = nzb
496
497	rflags_s_inner = 1.0_wp
498	rflags_invers = 1.0_wp
499
500	!
501	!-- Define vertical gridpoint from (or to) which on the usual finite difference
502	!-- form (which does not use surface fluxes) is applied
503	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
504	nzb_diff = nzb + 2
505	ELSE
506	nzb_diff = nzb + 1
507	ENDIF
508	IF ( use_top_fluxes ) THEN
509	nzt_diff = nzt - 1
510	ELSE
511	nzt_diff = nzt
512	ENDIF
513
514	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
515	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
516
517	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
518	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
519	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
520	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
521
522	!
523	!-- Initialize near-wall mixing length l_wall only in the vertical direction
524	!-- for the moment,
525	!-- multiplication with wall_adjustment_factor near the end of this routine
526	l_wall(nzb,:,:) = l_grid(1)
527	DO k = nzb+1, nzt
528	l_wall(k,:,:) = l_grid(k)
529	ENDDO
530	l_wall(nzt+1,:,:) = l_grid(nzt)
531
532	ALLOCATE ( vertical_influence(nzb:nzt) )
533	DO k = 1, nzt
534	vertical_influence(k) = MIN ( INT( l_grid(k) / &
535	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
536	ENDDO
537
538	DO k = 1, nzt
539	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
540	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
541	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
542	'threshold given by only local', &
543	' &horizontal reduction of near_wall ', &
544	'mixing length l_wall', &
545	' &starting from height level k = ', k, '.'
546	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
547	EXIT
548	ENDIF
549	ENDDO
550	vertical_influence(0) = vertical_influence(1)
551
552	DO k = nzb + 1, nzb + vertical_influence(nzb)
553	l_wall(k,:,:) = zu(k) - zw(nzb)
554	ENDDO
555
556	!
557	!-- Set outer and inner index arrays for non-flat topography.
558	!-- Here consistency checks concerning domain size and periodicity are
559	!-- necessary.
560	!-- Within this SELECT CASE structure only nzb_local is initialized
561	!-- individually depending on the chosen topography type, all other index
562	!-- arrays are initialized further below.
563	SELECT CASE ( TRIM( topography ) )
564
565	CASE ( 'flat' )
566	!
567	!-- nzb_local is required for the multigrid solver
568	nzb_local = 0
569
570	CASE ( 'single_building' )
571	!
572	!-- Single rectangular building, by default centered in the middle of the
573	!-- total domain
574	blx = NINT( building_length_x / dx )
575	bly = NINT( building_length_y / dy )
576	IF ( .NOT. ocean ) THEN
577	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
578	ELSE
579	bh = MINLOC( ABS( zw - zw(0) - building_height ), 1 ) - 1
580	ENDIF
581
582	IF ( ABS( zw(bh ) - building_height ) == &
583	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
584
585	IF ( building_wall_left == 9999999.9_wp ) THEN
586	building_wall_left = ( nx + 1 - blx ) / 2 * dx
587	ENDIF
588	bxl = NINT( building_wall_left / dx )
589	bxr = bxl + blx
590
591	IF ( building_wall_south == 9999999.9_wp ) THEN
592	building_wall_south = ( ny + 1 - bly ) / 2 * dy
593	ENDIF
594	bys = NINT( building_wall_south / dy )
595	byn = bys + bly
596
597	!
598	!-- Building size has to meet some requirements
599	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
600	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
601	WRITE( message_string, * ) 'inconsistent building parameters:', &
602	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
603	'byn=', byn, 'nx=', nx, 'ny=', ny
604	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
605	ENDIF
606
607	!
608	!-- Define the building.
609	nzb_local = 0
610	IF ( bxl <= nxr .AND. bxr >= nxl .AND. &
611	bys <= nyn .AND. byn >= nys ) &
612	nzb_local(MAX(nys,bys):MIN(nyn,byn),MAX(nxl,bxl):MIN(nxr,bxr)) = bh
613
614	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
615
616	CASE ( 'single_street_canyon' )
617	!
618	!-- Single quasi-2D street canyon of infinite length in x or y direction.
619	!-- The canyon is centered in the other direction by default.
620	IF ( canyon_width_x /= 9999999.9_wp ) THEN
621	!
622	!-- Street canyon in y direction
623	cwx = NINT( canyon_width_x / dx )
624	IF ( canyon_wall_left == 9999999.9_wp ) THEN
625	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
626	ENDIF
627	cxl = NINT( canyon_wall_left / dx )
628	cxr = cxl + cwx
629
630	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
631	!
632	!-- Street canyon in x direction
633	cwy = NINT( canyon_width_y / dy )
634	IF ( canyon_wall_south == 9999999.9_wp ) THEN
635	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
636	ENDIF
637	cys = NINT( canyon_wall_south / dy )
638	cyn = cys + cwy
639
640	ELSE
641
642	message_string = 'no street canyon width given'
643	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
644
645	ENDIF
646
647	IF ( .NOT. ocean ) THEN
648	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
649	ELSE
650	ch = MINLOC( ABS( zw - zw(0) - canyon_height ), 1 ) - 1
651	ENDIF
652
653	IF ( ABS( zw(ch ) - canyon_height ) == &
654	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
655
656	dp_level_ind_b = ch
657	!
658	!-- Street canyon size has to meet some requirements
659	IF ( canyon_width_x /= 9999999.9_wp ) THEN
660	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
661	( ch < 3 ) ) THEN
662	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
663	'&cxl=', cxl, 'cxr=', cxr, &
664	'cwx=', cwx, &
665	'ch=', ch, 'nx=', nx, 'ny=', ny
666	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
667	ENDIF
668	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
669	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
670	( ch < 3 ) ) THEN
671	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
672	'&cys=', cys, 'cyn=', cyn, &
673	'cwy=', cwy, &
674	'ch=', ch, 'nx=', nx, 'ny=', ny
675	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
676	ENDIF
677	ENDIF
678	IF ( canyon_width_x /= 9999999.9_wp .AND. &
679	canyon_width_y /= 9999999.9_wp ) THEN
680	message_string = 'inconsistent canyon parameters:' // &
681	'&street canyon can only be oriented' // &
682	'&either in x- or in y-direction'
683	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
684	ENDIF
685
686	nzb_local = ch
687	IF ( canyon_width_x /= 9999999.9_wp ) THEN
688	IF ( cxl <= nxr .AND. cxr >= nxl ) &
689	nzb_local(:,MAX(nxl,cxl+1):MIN(nxr,cxr-1)) = 0
690	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
691	IF ( cys <= nyn .AND. cyn >= nys ) &
692	nzb_local(MAX(nys,cys+1):MIN(nyn,cyn-1),:) = 0
693	ENDIF
694
695	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
696
697	CASE ( 'read_from_file' )
698
699	ALLOCATE ( topo_height(nys:nyn,nxl:nxr) )
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	!
710	!-- Read topography PE-wise. Rows are read from nyn to nys, columns
711	!-- are read from nxl to nxr. At first, ny-nyn rows need to be skipped.
712	skip_n_rows = 0
713	DO WHILE ( skip_n_rows < ny - nyn )
714	READ( 90, * )
715	skip_n_rows = skip_n_rows + 1
716	ENDDO
717	!
718	!-- Read data from nyn to nys and nxl to nxr. Therefore, skip
719	!-- column until nxl-1 is reached
720	DO j = nyn, nys, -1
721	READ( 90, *, ERR=11, END=11 ) &
722	( dum, i = 0, nxl-1 ), &
723	( topo_height(j,i), i = nxl, nxr )
724	ENDDO
725
726	GOTO 12
727
728	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
729	' does not exist'
730	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
731
732	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
733	TRIM( coupling_char )
734	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
735
736	12 CLOSE( 90 )
737
738	ENDIF
739	#if defined( __parallel )
740	CALL MPI_BARRIER( comm2d, ierr )
741	#endif
742	ENDDO
743
744	!
745	!-- Calculate the index height of the topography
746	nzb_local = 0
747	DO i = nxl, nxr
748	DO j = nys, nyn
749	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
750	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
751	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
752	nzb_local(j,i) = nzb_local(j,i) + 1
753	ENDDO
754	ENDDO
755
756	DEALLOCATE ( topo_height )
757	!
758	!-- Filter topography, i.e. fill holes resolved by only one grid point.
759	!-- Such holes are suspected to lead to velocity blow-ups as continuity
760	!-- equation on discrete grid cannot be fulfilled in such case.
761	!-- For now, check only for holes and fill them to the lowest height level
762	!-- of the directly adjoining grid points along x- and y- direction.
763	!-- Before checking for holes, set lateral boundary conditions for
764	!-- topography. After hole-filling, boundary conditions must be set again!
765	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
766
767	IF ( .NOT. bc_ns_cyc ) THEN
768	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
769	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
770	ENDIF
771
772	IF ( .NOT. bc_lr_cyc ) THEN
773	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
774	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
775	ENDIF
776
777	num_hole_l = 0
778	DO i = nxl, nxr
779	DO j = nys, nyn
780
781	num_wall = 0
782
783	IF ( nzb_local(j-1,i) > nzb_local(j,i) ) &
784	num_wall = num_wall + 1
785	IF ( nzb_local(j+1,i) > nzb_local(j,i) ) &
786	num_wall = num_wall + 1
787	IF ( nzb_local(j,i-1) > nzb_local(j,i) ) &
788	num_wall = num_wall + 1
789	IF ( nzb_local(j,i+1) > nzb_local(j,i) ) &
790	num_wall = num_wall + 1
791
792	IF ( num_wall == 4 ) THEN
793	nzb_local(j,i) = MIN( nzb_local(j-1,i), nzb_local(j+1,i), &
794	nzb_local(j,i-1), nzb_local(j,i+1) )
795	num_hole_l = num_hole_l + 1
796	ENDIF
797	ENDDO
798	ENDDO
799	!
800	!-- Count the total number of holes, required for informative message.
801	#if defined( __parallel )
802	CALL MPI_ALLREDUCE( num_hole_l, num_hole, 1, MPI_INTEGER, MPI_SUM, &
803	comm2d, ierr )
804	#else
805	num_hole = num_hole_l
806	#endif
807	!
808	!-- Create an informative message if any hole was removed.
809	IF ( num_hole > 0 ) THEN
810	WRITE( message_string, * ) num_hole, 'hole(s) resolved by only '//&
811	'one grid point were filled'
812	CALL message( 'init_grid', 'PA0430', 0, 0, 0, 6, 0 )
813	ENDIF
814	!
815	!-- Exchange ghost-points, as well as add cyclic or Neumann boundary
816	!-- conditions.
817	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
818
819	IF ( .NOT. bc_ns_cyc ) THEN
820	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
821	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
822	ENDIF
823
824	IF ( .NOT. bc_lr_cyc ) THEN
825	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
826	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
827	ENDIF
828
829	CASE DEFAULT
830	!
831	!-- The DEFAULT case is reached either if the parameter topography
832	!-- contains a wrong character string or if the user has defined a special
833	!-- case in the user interface. There, the subroutine user_init_grid
834	!-- checks which of these two conditions applies.
835	CALL user_init_grid( nzb_local )
836
837	END SELECT
838	!
839	!-- Determine the maximum level of topography. Furthermore it is used for
840	!-- steering the degradation of order of the applied advection scheme.
841	!-- In case of non-cyclic lateral boundaries, the order of the advection
842	!-- scheme has to be reduced up to nzt (required at the lateral boundaries).
843	#if defined( __parallel )
844	CALL MPI_ALLREDUCE( MAXVAL( nzb_local ) + 1, nzb_max, 1, MPI_INTEGER, &
845	MPI_MAX, comm2d, ierr )
846	#else
847	nzb_max = MAXVAL( nzb_local ) + 1
848	#endif
849	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
850	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
851	nest_domain ) &
852	THEN
853	nzb_max = nzt
854	ENDIF
855
856	!
857	!-- Consistency checks and index array initialization are only required for
858	!-- non-flat topography, also the initialization of topography height arrays
859	!-- zu_s_inner and zw_w_inner
860	IF ( TRIM( topography ) /= 'flat' ) THEN
861	#if defined( __parallel )
862	CALL MPI_ALLREDUCE( MAXVAL( nzb_local ), nzb_local_max, 1, MPI_INTEGER, &
863	MPI_MAX, comm2d, ierr )
864	CALL MPI_ALLREDUCE( MINVAL( nzb_local ), nzb_local_min, 1, MPI_INTEGER, &
865	MPI_MIN, comm2d, ierr )
866	#else
867	nzb_local_max = MAXVAL( nzb_local )
868	nzb_local_min = MINVAL( nzb_local )
869	#endif
870
871	!
872	!-- Consistency checks
873	IF ( nzb_local_min < 0 .OR. nzb_local_max > nz + 1 ) THEN
874	WRITE( message_string, * ) 'nzb_local values are outside the', &
875	'model domain', &
876	'&MINVAL( nzb_local ) = ', nzb_local_min, &
877	'&MAXVAL( nzb_local ) = ', nzb_local_max
878	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
879	ENDIF
880
881	IF ( topography_grid_convention == 'cell_edge' ) THEN
882	!
883	!-- The array nzb_local as defined using the 'cell_edge' convention
884	!-- describes the actual total size of topography which is defined at the
885	!-- cell edges where u=0 on the topography walls in x-direction and v=0
886	!-- on the topography walls in y-direction. However, PALM uses individual
887	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
888	!-- Therefore, the extent of topography in nzb_local is now reduced by
889	!-- 1dx at the E topography walls and by 1dy at the N topography walls
890	!-- to form the basis for nzb_s_inner.
891	!-- Note, the reverse memory access (i-j instead of j-i) is absolutely
892	!-- required at this point.
893	DO j = nys+1, nyn+1
894	DO i = nxl-1, nxr
895	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
896	ENDDO
897	ENDDO
898	!
899	!-- Exchange ghost points
900	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
901
902	DO i = nxl, nxr+1
903	DO j = nys-1, nyn
904	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
905	ENDDO
906	ENDDO
907	!
908	!-- Exchange ghost points
909	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
910	ENDIF
911	!
912	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
913	nzb_s_inner = nzb_local
914	nzb_w_inner = nzb_local
915
916	!
917	!-- Initialize remaining index arrays:
918	!-- first pre-initialize them with nzb_s_inner...
919	nzb_u_inner = nzb_s_inner
920	nzb_u_outer = nzb_s_inner
921	nzb_v_inner = nzb_s_inner
922	nzb_v_outer = nzb_s_inner
923	nzb_w_outer = nzb_s_inner
924	nzb_s_outer = nzb_s_inner
925
926	!
927	!-- ...then extend pre-initialized arrays in their according directions
928	!-- based on nzb_local using nzb_tmp as a temporary global index array
929
930	!
931	!-- nzb_s_outer:
932	!-- extend nzb_local east-/westwards first, then north-/southwards
933	nzb_tmp = nzb_local
934	DO j = nys, nyn
935	DO i = nxl, nxr
936	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
937	nzb_local(j,i+1) )
938	ENDDO
939	ENDDO
940
941	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
942
943	DO i = nxl, nxr
944	DO j = nys, nyn
945	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
946	nzb_tmp(j+1,i) )
947	ENDDO
948	!
949	!-- non-cyclic boundary conditions (overwritten by call of
950	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
951	IF ( nys == 0 ) THEN
952	j = -1
953	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
954	ENDIF
955	IF ( nyn == ny ) THEN
956	j = ny + 1
957	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
958	ENDIF
959	ENDDO
960	!
961	!-- nzb_w_outer:
962	!-- identical to nzb_s_outer
963	nzb_w_outer = nzb_s_outer
964
965	!
966	!-- nzb_u_inner:
967	!-- extend nzb_local rightwards only
968	nzb_tmp = nzb_local
969	DO j = nys, nyn
970	DO i = nxl, nxr
971	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
972	ENDDO
973	ENDDO
974
975	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
976
977	nzb_u_inner = nzb_tmp
978	!
979	!-- nzb_u_outer:
980	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
981	DO i = nxl, nxr
982	DO j = nys, nyn
983	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
984	nzb_tmp(j+1,i) )
985	ENDDO
986	!
987	!-- non-cyclic boundary conditions (overwritten by call of
988	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
989	IF ( nys == 0 ) THEN
990	j = -1
991	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
992	ENDIF
993	IF ( nyn == ny ) THEN
994	j = ny + 1
995	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
996	ENDIF
997	ENDDO
998
999	!
1000	!-- nzb_v_inner:
1001	!-- extend nzb_local northwards only
1002	nzb_tmp = nzb_local
1003	DO i = nxl, nxr
1004	DO j = nys, nyn
1005	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
1006	ENDDO
1007	ENDDO
1008
1009	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
1010	nzb_v_inner = nzb_tmp
1011
1012	!
1013	!-- nzb_v_outer:
1014	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
1015	DO j = nys, nyn
1016	DO i = nxl, nxr
1017	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
1018	nzb_tmp(j,i+1) )
1019	ENDDO
1020	!
1021	!-- non-cyclic boundary conditions (overwritten by call of
1022	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
1023	IF ( nxl == 0 ) THEN
1024	i = -1
1025	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
1026	ENDIF
1027	IF ( nxr == nx ) THEN
1028	i = nx + 1
1029	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
1030	ENDIF
1031	ENDDO
1032
1033	!
1034	!-- Exchange of lateral boundary values (parallel computers) and cyclic
1035	!-- boundary conditions, if applicable.
1036	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
1037	!-- they do not require exchange and are not included here.
1038	CALL exchange_horiz_2d_int( nzb_u_inner, nys, nyn, nxl, nxr, nbgp )
1039	CALL exchange_horiz_2d_int( nzb_u_outer, nys, nyn, nxl, nxr, nbgp )
1040	CALL exchange_horiz_2d_int( nzb_v_inner, nys, nyn, nxl, nxr, nbgp )
1041	CALL exchange_horiz_2d_int( nzb_v_outer, nys, nyn, nxl, nxr, nbgp )
1042	CALL exchange_horiz_2d_int( nzb_w_outer, nys, nyn, nxl, nxr, nbgp )
1043	CALL exchange_horiz_2d_int( nzb_s_outer, nys, nyn, nxl, nxr, nbgp )
1044
1045	!
1046	!-- Allocate and set the arrays containing the topography height
1047	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1), &
1048	zu_s_inner_l(0:nx+1,0:ny+1), zw_w_inner_l(0:nx+1,0:ny+1) )
1049
1050	zu_s_inner = 0.0_wp
1051	zw_w_inner = 0.0_wp
1052	zu_s_inner_l = 0.0_wp
1053	zw_w_inner_l = 0.0_wp
1054
1055	DO i = nxl, nxr
1056	DO j = nys, nyn
1057	zu_s_inner_l(i,j) = zu(nzb_local(j,i))
1058	zw_w_inner_l(i,j) = zw(nzb_local(j,i))
1059	ENDDO
1060	ENDDO
1061
1062	#if defined( __parallel )
1063	CALL MPI_REDUCE( zu_s_inner_l, zu_s_inner, (nx+2)*(ny+2), &
1064	MPI_REAL, MPI_SUM, 0, comm2d, ierr )
1065	CALL MPI_REDUCE( zw_w_inner_l, zw_w_inner, (nx+2)*(ny+2), &
1066	MPI_REAL, MPI_SUM, 0, comm2d, ierr )
1067	#else
1068	zu_s_inner = zu_s_inner_l
1069	zw_w_inner = zw_w_inner_l
1070	#endif
1071
1072	DEALLOCATE( zu_s_inner_l, zw_w_inner_l )
1073	IF ( myid /= 0 ) DEALLOCATE( zu_s_inner, zw_w_inner )
1074	!
1075	!-- Set south and left ghost points, required for netcdf output
1076	IF ( myid == 0 ) THEN
1077	IF( bc_lr_cyc ) THEN
1078	zu_s_inner(nx+1,:) = zu_s_inner(0,:)
1079	zw_w_inner(nx+1,:) = zw_w_inner(0,:)
1080	ELSE
1081	zu_s_inner(nx+1,:) = zu_s_inner(nx,:)
1082	zw_w_inner(nx+1,:) = zw_w_inner(nx,:)
1083	ENDIF
1084	IF( bc_ns_cyc ) THEN
1085	zu_s_inner(:,ny+1) = zu_s_inner(:,0)
1086	zw_w_inner(:,ny+1) = zw_w_inner(:,0)
1087	ELSE
1088	zu_s_inner(:,ny+1) = zu_s_inner(:,ny)
1089	zw_w_inner(:,ny+1) = zw_w_inner(:,ny)
1090	ENDIF
1091	ENDIF
1092	!
1093	!-- Set flag arrays to be used for masking of grid points
1094	DO i = nxlg, nxrg
1095	DO j = nysg, nyng
1096	DO k = nzb, nzt+1
1097	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
1098	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
1099	ENDDO
1100	ENDDO
1101	ENDDO
1102
1103	ENDIF
1104	!
1105	!-- Deallocate temporary array, as it might be reused for different
1106	!-- grid-levels further below.
1107	DEALLOCATE( nzb_tmp )
1108
1109	!
1110	!-- Set the individual index arrays which define the k index from which on
1111	!-- the usual finite difference form (which does not use surface fluxes) is
1112	!-- applied
1113	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
1114	nzb_diff_u = nzb_u_inner + 2
1115	nzb_diff_v = nzb_v_inner + 2
1116	nzb_diff_s_inner = nzb_s_inner + 2
1117	nzb_diff_s_outer = nzb_s_outer + 2
1118	ELSE
1119	nzb_diff_u = nzb_u_inner + 1
1120	nzb_diff_v = nzb_v_inner + 1
1121	nzb_diff_s_inner = nzb_s_inner + 1
1122	nzb_diff_s_outer = nzb_s_outer + 1
1123	ENDIF
1124
1125	!
1126	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
1127	!-- for limitation of near-wall mixing length l_wall further below
1128	corner_nl = 0
1129	corner_nr = 0
1130	corner_sl = 0
1131	corner_sr = 0
1132	wall_l = 0
1133	wall_n = 0
1134	wall_r = 0
1135	wall_s = 0
1136
1137	DO i = nxl, nxr
1138	DO j = nys, nyn
1139	!
1140	!-- u-component
1141	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
1142	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1143	fym(j,i) = 0.0_wp
1144	fyp(j,i) = 1.0_wp
1145	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
1146	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
1147	fym(j,i) = 1.0_wp
1148	fyp(j,i) = 0.0_wp
1149	ENDIF
1150	!
1151	!-- v-component
1152	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
1153	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
1154	fxm(j,i) = 0.0_wp
1155	fxp(j,i) = 1.0_wp
1156	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
1157	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
1158	fxm(j,i) = 1.0_wp
1159	fxp(j,i) = 0.0_wp
1160	ENDIF
1161	!
1162	!-- w-component, also used for scalars, separate arrays for shear
1163	!-- production of tke
1164	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
1165	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
1166	wall_w_y(j,i) = 1.0_wp
1167	fwym(j,i) = 0.0_wp
1168	fwyp(j,i) = 1.0_wp
1169	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
1170	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
1171	wall_w_y(j,i) = 1.0_wp
1172	fwym(j,i) = 1.0_wp
1173	fwyp(j,i) = 0.0_wp
1174	ENDIF
1175	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
1176	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
1177	wall_w_x(j,i) = 1.0_wp
1178	fwxm(j,i) = 0.0_wp
1179	fwxp(j,i) = 1.0_wp
1180	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
1181	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
1182	wall_w_x(j,i) = 1.0_wp
1183	fwxm(j,i) = 1.0_wp
1184	fwxp(j,i) = 0.0_wp
1185	ENDIF
1186	!
1187	!-- Wall and corner locations inside buildings for limitation of
1188	!-- near-wall mixing length l_wall
1189	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
1190
1191	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
1192
1193	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1194	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
1195	nzb_s_inner(j,i-1) ) + 1
1196	ENDIF
1197
1198	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1199	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
1200	nzb_s_inner(j,i+1) ) + 1
1201	ENDIF
1202
1203	ENDIF
1204
1205	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
1206
1207	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
1208	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1209	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
1210	nzb_s_inner(j,i-1) ) + 1
1211	ENDIF
1212
1213	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1214	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
1215	nzb_s_inner(j,i+1) ) + 1
1216	ENDIF
1217
1218	ENDIF
1219
1220	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
1221	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
1222	ENDIF
1223
1224	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
1225	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
1226	ENDIF
1227
1228	ENDDO
1229	ENDDO
1230	!
1231	!-- Calculate wall flag arrays for the multigrid method.
1232	!-- Please note, wall flags are only applied in the not cache-optimized
1233	!-- version.
1234	IF ( psolver == 'multigrid_noopt' ) THEN
1235
1236	!
1237	!-- Gridpoint increment of the current level.
1238	inc = 1
1239	DO l = maximum_grid_level, 1 , -1
1240	!
1241	!-- Set grid_level as it is required for exchange_horiz_2d_int
1242	grid_level = l
1243
1244	nxl_l = nxl_mg(l)
1245	nxr_l = nxr_mg(l)
1246	nys_l = nys_mg(l)
1247	nyn_l = nyn_mg(l)
1248	nzt_l = nzt_mg(l)
1249	!
1250	!-- Assign the flag level to be calculated
1251	SELECT CASE ( l )
1252	CASE ( 1 )
1253	flags => wall_flags_1
1254	CASE ( 2 )
1255	flags => wall_flags_2
1256	CASE ( 3 )
1257	flags => wall_flags_3
1258	CASE ( 4 )
1259	flags => wall_flags_4
1260	CASE ( 5 )
1261	flags => wall_flags_5
1262	CASE ( 6 )
1263	flags => wall_flags_6
1264	CASE ( 7 )
1265	flags => wall_flags_7
1266	CASE ( 8 )
1267	flags => wall_flags_8
1268	CASE ( 9 )
1269	flags => wall_flags_9
1270	CASE ( 10 )
1271	flags => wall_flags_10
1272	END SELECT
1273
1274	!
1275	!-- Depending on the grid level, set the respective bits in case of
1276	!-- neighbouring walls
1277	!-- Bit 0: wall to the bottom
1278	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1279	!-- Bit 2: wall to the south
1280	!-- Bit 3: wall to the north
1281	!-- Bit 4: wall to the left
1282	!-- Bit 5: wall to the right
1283	!-- Bit 6: inside building
1284
1285	flags = 0
1286
1287	!
1288	!-- In case of masking method, flags are not set and multigrid method
1289	!-- works like FFT-solver
1290	IF ( .NOT. masking_method ) THEN
1291
1292	!
1293	!-- Allocate temporary array for topography heights on coarser grid
1294	!-- level. Please note, 2 ghoist points are required, in order to
1295	!-- calculate flags() on the interior ghost point.
1296	ALLOCATE( nzb_tmp(nys_l-2:nyn_l+2,nxl_l-2:nxr_l+2) )
1297	nzb_tmp = 0
1298
1299	DO i = nxl_l, nxr_l
1300	DO j = nys_l, nyn_l
1301	nzb_tmp(j,i) = nzb_local(jinc,iinc)
1302	ENDDO
1303	ENDDO
1304	!
1305	!-- Exchange ghost points on respective multigrid level. 2 ghost points
1306	!-- are required, in order to calculate flags on
1307	!-- nys_l-1 / nyn_l+1 / nxl_l-1 / nxr_l+1. The alternative would be to
1308	!-- exchange 3D-INTEGER array flags on the respective multigrid level.
1309	CALL exchange_horiz_2d_int( nzb_tmp, nys_l, nyn_l, nxl_l, nxr_l, 2 )
1310	!
1311	!-- Set non-cyclic boundary conditions on respective multigrid level
1312	IF ( .NOT. bc_ns_cyc ) THEN
1313	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1314	nzb_tmp(-2,:) = nzb_tmp(0,:)
1315	nzb_tmp(-1,:) = nzb_tmp(0,:)
1316	ENDIF
1317	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
1318	nzb_tmp(nyn_l+2,:) = nzb_tmp(nyn_l,:)
1319	nzb_tmp(nyn_l+1,:) = nzb_tmp(nyn_l,:)
1320	ENDIF
1321	ENDIF
1322	IF ( .NOT. bc_lr_cyc ) THEN
1323	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1324	nzb_tmp(:,-2) = nzb_tmp(:,0)
1325	nzb_tmp(:,-1) = nzb_tmp(:,0)
1326	ENDIF
1327	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
1328	nzb_tmp(:,nxr_l+1) = nzb_tmp(:,nxr_l)
1329	nzb_tmp(:,nxr_l+2) = nzb_tmp(:,nxr_l)
1330	ENDIF
1331	ENDIF
1332
1333	DO i = nxl_l-1, nxr_l+1
1334	DO j = nys_l-1, nyn_l+1
1335	DO k = nzb, nzt_l+1
1336	!
1337	!-- Inside/outside building (inside building does not need
1338	!-- further tests for walls)
1339	IF ( k*inc <= nzb_tmp(j,i) ) THEN
1340
1341	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1342
1343	ELSE
1344	!
1345	!-- Bottom wall
1346	IF ( (k-1)*inc <= nzb_tmp(j,i) ) THEN
1347	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1348	ENDIF
1349	!
1350	!-- South wall
1351	IF ( k*inc <= nzb_tmp(j-1,i) ) THEN
1352	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1353	ENDIF
1354	!
1355	!-- North wall
1356	IF ( k*inc <= nzb_tmp(j+1,i) ) THEN
1357	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1358	ENDIF
1359	!
1360	!-- Left wall
1361	IF ( k*inc <= nzb_tmp(j,i-1) ) THEN
1362	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1363	ENDIF
1364	!
1365	!-- Right wall
1366	IF ( k*inc <= nzb_tmp(j,i+1) ) THEN
1367	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1368	ENDIF
1369
1370	ENDIF
1371
1372	ENDDO
1373	ENDDO
1374	ENDDO
1375
1376	DEALLOCATE( nzb_tmp )
1377
1378	ENDIF
1379
1380	inc = inc * 2
1381
1382	ENDDO
1383	!
1384	!-- Reset grid_level to "normal" grid
1385	grid_level = 0
1386
1387	ENDIF
1388	!
1389	!-- Allocate flags needed for masking walls. Even though these flags are only
1390	!-- required in the ws-scheme, the arrays need to be allocated here as they are
1391	!-- used in OpenACC directives.
1392	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
1393	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1394	wall_flags_0 = 0
1395	wall_flags_00 = 0
1396	!
1397	!-- Init flags for ws-scheme to degrade order of the numerics near walls, i.e.
1398	!-- to decrease the numerical stencil appropriately.
1399	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' .OR.&
1400	scalar_advec == 'ws-scheme-mono' ) THEN
1401	CALL ws_init_flags
1402	ENDIF
1403
1404	!
1405	!-- In case of topography: limit near-wall mixing length l_wall further:
1406	!-- Go through all points of the subdomain one by one and look for the closest
1407	!-- surface
1408	IF ( TRIM(topography) /= 'flat' ) THEN
1409	DO i = nxl, nxr
1410	DO j = nys, nyn
1411
1412	nzb_si = nzb_s_inner(j,i)
1413	vi = vertical_influence(nzb_si)
1414
1415	IF ( wall_n(j,i) > 0 ) THEN
1416	!
1417	!-- North wall (y distance)
1418	DO k = wall_n(j,i), nzb_si
1419	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
1420	ENDDO
1421	!
1422	!-- Above North wall (yz distance)
1423	DO k = nzb_si + 1, nzb_si + vi
1424	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1425	SQRT( 0.25_wp * dy**2 + &
1426	( zu(k) - zw(nzb_si) )**2 ) )
1427	ENDDO
1428	!
1429	!-- Northleft corner (xy distance)
1430	IF ( corner_nl(j,i) > 0 ) THEN
1431	DO k = corner_nl(j,i), nzb_si
1432	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1433	0.5_wp * SQRT( dx2 + dy2 ) )
1434	ENDDO
1435	!
1436	!-- Above Northleft corner (xyz distance)
1437	DO k = nzb_si + 1, nzb_si + vi
1438	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1439	SQRT( 0.25_wp * (dx2 + dy2) + &
1440	( zu(k) - zw(nzb_si) )**2 ) )
1441	ENDDO
1442	ENDIF
1443	!
1444	!-- Northright corner (xy distance)
1445	IF ( corner_nr(j,i) > 0 ) THEN
1446	DO k = corner_nr(j,i), nzb_si
1447	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1448	0.5_wp * SQRT( dx2 + dy2 ) )
1449	ENDDO
1450	!
1451	!-- Above northright corner (xyz distance)
1452	DO k = nzb_si + 1, nzb_si + vi
1453	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1454	SQRT( 0.25_wp * (dx2 + dy2) + &
1455	( zu(k) - zw(nzb_si) )**2 ) )
1456	ENDDO
1457	ENDIF
1458	ENDIF
1459
1460	IF ( wall_s(j,i) > 0 ) THEN
1461	!
1462	!-- South wall (y distance)
1463	DO k = wall_s(j,i), nzb_si
1464	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
1465	ENDDO
1466	!
1467	!-- Above south wall (yz distance)
1468	DO k = nzb_si + 1, nzb_si + vi
1469	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1470	SQRT( 0.25_wp * dy**2 + &
1471	( zu(k) - zw(nzb_si) )**2 ) )
1472	ENDDO
1473	!
1474	!-- Southleft corner (xy distance)
1475	IF ( corner_sl(j,i) > 0 ) THEN
1476	DO k = corner_sl(j,i), nzb_si
1477	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1478	0.5_wp * SQRT( dx2 + dy2 ) )
1479	ENDDO
1480	!
1481	!-- Above southleft corner (xyz distance)
1482	DO k = nzb_si + 1, nzb_si + vi
1483	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1484	SQRT( 0.25_wp * (dx2 + dy2) + &
1485	( zu(k) - zw(nzb_si) )**2 ) )
1486	ENDDO
1487	ENDIF
1488	!
1489	!-- Southright corner (xy distance)
1490	IF ( corner_sr(j,i) > 0 ) THEN
1491	DO k = corner_sr(j,i), nzb_si
1492	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1493	0.5_wp * SQRT( dx2 + dy2 ) )
1494	ENDDO
1495	!
1496	!-- Above southright corner (xyz distance)
1497	DO k = nzb_si + 1, nzb_si + vi
1498	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1499	SQRT( 0.25_wp * (dx2 + dy2) + &
1500	( zu(k) - zw(nzb_si) )**2 ) )
1501	ENDDO
1502	ENDIF
1503
1504	ENDIF
1505
1506	IF ( wall_l(j,i) > 0 ) THEN
1507	!
1508	!-- Left wall (x distance)
1509	DO k = wall_l(j,i), nzb_si
1510	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
1511	ENDDO
1512	!
1513	!-- Above left wall (xz distance)
1514	DO k = nzb_si + 1, nzb_si + vi
1515	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1516	SQRT( 0.25_wp * dx**2 + &
1517	( zu(k) - zw(nzb_si) )**2 ) )
1518	ENDDO
1519	ENDIF
1520
1521	IF ( wall_r(j,i) > 0 ) THEN
1522	!
1523	!-- Right wall (x distance)
1524	DO k = wall_r(j,i), nzb_si
1525	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
1526	ENDDO
1527	!
1528	!-- Above right wall (xz distance)
1529	DO k = nzb_si + 1, nzb_si + vi
1530	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1531	SQRT( 0.25_wp * dx**2 + &
1532	( zu(k) - zw(nzb_si) )**2 ) )
1533	ENDDO
1534
1535	ENDIF
1536
1537	ENDDO
1538	ENDDO
1539
1540	ENDIF
1541
1542	!
1543	!-- Multiplication with wall_adjustment_factor
1544	l_wall = wall_adjustment_factor * l_wall
1545
1546	!
1547	!-- Set lateral boundary conditions for l_wall
1548	CALL exchange_horiz( l_wall, nbgp )
1549
1550	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1551	vertical_influence, wall_l, wall_n, wall_r, wall_s )
1552
1553
1554	END SUBROUTINE init_grid

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