Home

Context Navigation

source: palm/trunk/SOURCE/init_grid.f90 @ 1036

Last change on this file since 1036 was 1036, checked in by raasch, 11 years ago
code has been put under the GNU General Public License (v3)
Property svn:keywords set to `Id`
File size: 56.1 KB

Line
1	SUBROUTINE init_grid
2
3	!--------------------------------------------------------------------------------!
4	! This file is part of PALM.
5	!
6	! PALM is free software: you can redistribute it and/or modify it under the terms
7	! of the GNU General Public License as published by the Free Software Foundation,
8	! either version 3 of the License, or (at your option) any later 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 1997-2012 Leibniz University Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: init_grid.f90 1036 2012-10-22 13:43:42Z raasch $
27	!
28	! 1015 2012-09-27 09:23:24Z raasch
29	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
30	! nzb_w_inner+1
31	!
32	! 996 2012-09-07 10:41:47Z raasch
33	! little reformatting
34	!
35	! 978 2012-08-09 08:28:32Z fricke
36	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
37	! Bugfix: Set wall_flags_0 for inflow boundary
38	!
39	! 927 2012-06-06 19:15:04Z raasch
40	! Wall flags are not set for multigrid method in case of masking method
41	!
42	! 864 2012-03-27 15:10:33Z gryschka
43	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
44	! were not correctly defined for k=1.
45	!
46	! 861 2012-03-26 14:18:34Z suehring
47	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
48	! inflow and outflow boundaries as well as near the bottom and the top of the
49	! model domain.!
50	! Initialization of nzb_s_inner and nzb_w_inner.
51	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
52	! while setting wall_flags_0
53	!
54	! 843 2012-02-29 15:16:21Z gryschka
55	! In case of ocean and dirichlet bc for u and v at the bottom
56	! the first u-level ist defined at same height as the first w-level
57	!
58	! 818 2012-02-08 16:11:23Z maronga
59	! Bugfix: topo_height is only required if topography is used. It is thus now
60	! allocated in the topography branch
61	!
62	! 809 2012-01-30 13:32:58Z maronga
63	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
64	!
65	! 807 2012-01-25 11:53:51Z maronga
66	! New cpp directive "__check" implemented which is used by check_namelist_files
67	!
68	! 759 2011-09-15 13:58:31Z raasch
69	! Splitting of parallel I/O in blocks of PEs
70	!
71	! 722 2011-04-11 06:21:09Z raasch
72	! Bugfix: bc_lr/ns_cyc replaced by bc_lr/ns, because variables are not yet set
73	! here
74	!
75	! 709 2011-03-30 09:31:40Z raasch
76	! formatting adjustments
77	!
78	! 707 2011-03-29 11:39:40Z raasch
79	! bc_lr/ns replaced by bc_lr/ns_cyc
80	!
81	! 667 2010-12-23 12:06:00Z suehring/gryschka
82	! Definition of new array bounds nxlg, nxrg, nysg, nyng on each PE.
83	! Furthermore the allocation of arrays and steering of loops is done with these
84	! parameters. Call of exchange_horiz are modified.
85	! In case of dirichlet bounday condition at the bottom zu(0)=0.0
86	! dzu_mg has to be set explicitly for a equally spaced grid near bottom.
87	! ddzu_pres added to use a equally spaced grid near bottom.
88	!
89	! 555 2010-09-07 07:32:53Z raasch
90	! Bugfix: default setting of nzb_local for flat topography
91	!
92	! 274 2009-03-26 15:11:21Z heinze
93	! Output of messages replaced by message handling routine.
94	! new topography case 'single_street_canyon'
95	!
96	! 217 2008-12-09 18:00:48Z letzel
97	! +topography_grid_convention
98	!
99	! 134 2007-11-21 07:28:38Z letzel
100	! Redefine initial nzb_local as the actual total size of topography (later the
101	! extent of topography in nzb_local is reduced by 1dx at the E topography walls
102	! and by 1dy at the N topography walls to form the basis for nzb_s_inner);
103	! for consistency redefine 'single_building' case.
104	! Calculation of wall flag arrays
105	!
106	! 94 2007-06-01 15:25:22Z raasch
107	! Grid definition for ocean version
108	!
109	! 75 2007-03-22 09:54:05Z raasch
110	! storage of topography height arrays zu_s_inner and zw_s_inner,
111	! 2nd+3rd argument removed from exchange horiz
112	!
113	! 19 2007-02-23 04:53:48Z raasch
114	! Setting of nzt_diff
115	!
116	! RCS Log replace by Id keyword, revision history cleaned up
117	!
118	! Revision 1.17 2006/08/22 14:00:05 raasch
119	! +dz_max to limit vertical stretching,
120	! bugfix in index array initialization for line- or point-like topography
121	! structures
122	!
123	! Revision 1.1 1997/08/11 06:17:45 raasch
124	! Initial revision (Testversion)
125	!
126	!
127	! Description:
128	! ------------
129	! Creating grid depending constants
130	!------------------------------------------------------------------------------!
131
132	USE arrays_3d
133	USE control_parameters
134	USE grid_variables
135	USE indices
136	USE pegrid
137
138	IMPLICIT NONE
139
140	INTEGER :: bh, blx, bly, bxl, bxr, byn, bys, ch, cwx, cwy, cxl, cxr, cyn, &
141	cys, gls, i, ii, inc, i_center, j, j_center, k, l, nxl_l, &
142	nxr_l, nyn_l, nys_l, nzb_si, nzt_l, vi
143
144	INTEGER, DIMENSION(:), ALLOCATABLE :: vertical_influence
145
146	INTEGER, DIMENSION(:,:), ALLOCATABLE :: corner_nl, corner_nr, corner_sl, &
147	corner_sr, wall_l, wall_n, wall_r,&
148	wall_s, nzb_local, nzb_tmp
149
150	LOGICAL :: flag_set = .FALSE.
151
152	REAL :: dx_l, dy_l, dz_stretched
153
154	REAL, DIMENSION(:,:), ALLOCATABLE :: topo_height
155
156	REAL, DIMENSION(:,:,:), ALLOCATABLE :: distance
157
158	!
159	!-- Calculation of horizontal array bounds including ghost layers
160	nxlg = nxl - nbgp
161	nxrg = nxr + nbgp
162	nysg = nys - nbgp
163	nyng = nyn + nbgp
164
165	!
166	!-- Allocate grid arrays
167	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
168	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
169
170	!
171	!-- Compute height of u-levels from constant grid length and dz stretch factors
172	IF ( dz == -1.0 ) THEN
173	message_string = 'missing dz'
174	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
175	ELSEIF ( dz <= 0.0 ) THEN
176	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
177	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
178	ENDIF
179
180	!
181	!-- Define the vertical grid levels
182	IF ( .NOT. ocean ) THEN
183	!
184	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
185	!-- The second u-level (k=1) corresponds to the top of the
186	!-- Prandtl-layer.
187
188	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
189	zu(0) = 0.0
190	! zu(0) = - dz * 0.5
191	ELSE
192	zu(0) = - dz * 0.5
193	ENDIF
194	zu(1) = dz * 0.5
195
196	dz_stretch_level_index = nzt+1
197	dz_stretched = dz
198	DO k = 2, nzt+1
199	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
200	dz_stretched = dz_stretched * dz_stretch_factor
201	dz_stretched = MIN( dz_stretched, dz_max )
202	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
203	ENDIF
204	zu(k) = zu(k-1) + dz_stretched
205	ENDDO
206
207	!
208	!-- Compute the w-levels. They are always staggered half-way between the
209	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
210	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
211	!-- The top w-level is extrapolated linearly.
212	zw(0) = 0.0
213	DO k = 1, nzt
214	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
215	ENDDO
216	zw(nzt+1) = zw(nzt) + 2.0 * ( zu(nzt+1) - zw(nzt) )
217
218	ELSE
219	!
220	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
221	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
222	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
223	!-- w-level are defined at same height, but staggered from the second level.
224	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
225	zu(nzt+1) = dz * 0.5
226	zu(nzt) = - dz * 0.5
227
228	dz_stretch_level_index = 0
229	dz_stretched = dz
230	DO k = nzt-1, 0, -1
231	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
232	dz_stretched < dz_max ) THEN
233	dz_stretched = dz_stretched * dz_stretch_factor
234	dz_stretched = MIN( dz_stretched, dz_max )
235	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
236	ENDIF
237	zu(k) = zu(k+1) - dz_stretched
238	ENDDO
239
240	!
241	!-- Compute the w-levels. They are always staggered half-way between the
242	!-- corresponding u-levels, except in case of dirichlet bc for u and v
243	!-- at the ground. In this case the first u- and w-level are defined at
244	!-- same height. The top w-level (nzt+1) is not used but set for
245	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
246	zw(nzt+1) = dz
247	zw(nzt) = 0.0
248	DO k = 0, nzt
249	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
250	ENDDO
251
252	!
253	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
254	!-- at same height.
255	IF ( ibc_uv_b == 0 ) THEN
256	zu(0) = zw(0)
257	ENDIF
258
259	ENDIF
260
261	!
262	!-- Compute grid lengths.
263	DO k = 1, nzt+1
264	dzu(k) = zu(k) - zu(k-1)
265	ddzu(k) = 1.0 / dzu(k)
266	dzw(k) = zw(k) - zw(k-1)
267	ddzw(k) = 1.0 / dzw(k)
268	ENDDO
269
270	DO k = 1, nzt
271	dd2zu(k) = 1.0 / ( dzu(k) + dzu(k+1) )
272	ENDDO
273
274	!
275	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
276	!-- everywhere. For the actual grid, the grid spacing at the lowest level
277	!-- is only dz/2, but should be dz. Therefore, an additional array
278	!-- containing with appropriate grid information is created for these
279	!-- solvers.
280	IF ( psolver /= 'multigrid' ) THEN
281	ALLOCATE( ddzu_pres(1:nzt+1) )
282	ddzu_pres = ddzu
283	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
284	ENDIF
285
286	!
287	!-- In case of multigrid method, compute grid lengths and grid factors for the
288	!-- grid levels
289	IF ( psolver == 'multigrid' ) THEN
290
291	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
292	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
293	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
294	f1_mg(nzb+1:nzt,maximum_grid_level), &
295	f2_mg(nzb+1:nzt,maximum_grid_level), &
296	f3_mg(nzb+1:nzt,maximum_grid_level) )
297
298	dzu_mg(:,maximum_grid_level) = dzu
299	!
300	!-- Next line to ensure an equally spaced grid.
301	dzu_mg(1,maximum_grid_level) = dzu(2)
302
303	dzw_mg(:,maximum_grid_level) = dzw
304	nzt_l = nzt
305	DO l = maximum_grid_level-1, 1, -1
306	dzu_mg(nzb+1,l) = 2.0 * dzu_mg(nzb+1,l+1)
307	dzw_mg(nzb+1,l) = 2.0 * dzw_mg(nzb+1,l+1)
308	nzt_l = nzt_l / 2
309	DO k = 2, nzt_l+1
310	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
311	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
312	ENDDO
313	ENDDO
314
315	nzt_l = nzt
316	dx_l = dx
317	dy_l = dy
318	DO l = maximum_grid_level, 1, -1
319	ddx2_mg(l) = 1.0 / dx_l**2
320	ddy2_mg(l) = 1.0 / dy_l**2
321	DO k = nzb+1, nzt_l
322	f2_mg(k,l) = 1.0 / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
323	f3_mg(k,l) = 1.0 / ( dzu_mg(k,l) * dzw_mg(k,l) )
324	f1_mg(k,l) = 2.0 * ( ddx2_mg(l) + ddy2_mg(l) ) + &
325	f2_mg(k,l) + f3_mg(k,l)
326	ENDDO
327	nzt_l = nzt_l / 2
328	dx_l = dx_l * 2.0
329	dy_l = dy_l * 2.0
330	ENDDO
331
332	ENDIF
333
334	!
335	!-- Compute the reciprocal values of the horizontal grid lengths.
336	ddx = 1.0 / dx
337	ddy = 1.0 / dy
338	dx2 = dx * dx
339	dy2 = dy * dy
340	ddx2 = 1.0 / dx2
341	ddy2 = 1.0 / dy2
342
343	!
344	!-- Compute the grid-dependent mixing length.
345	DO k = 1, nzt
346	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333
347	ENDDO
348
349	!
350	!-- Allocate outer and inner index arrays for topography and set
351	!-- defaults.
352	!-- nzb_local has to contain additional layers of ghost points for calculating
353	!-- the flag arrays needed for the multigrid method
354	gls = 2**( maximum_grid_level )
355	IF ( gls < nbgp ) gls = nbgp
356
357	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
358	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
359	nzb_local(-gls:ny+gls,-gls:nx+gls), &
360	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
361	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
362	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
363	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
364	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
365	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
366	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
367	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
368	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
369	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
370	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
371	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
372	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
373	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
374	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
375	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
376	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
377	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
378	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
379	nzb_2d(nysg:nyng,nxlg:nxrg), &
380	wall_e_x(nysg:nyng,nxlg:nxrg), &
381	wall_e_y(nysg:nyng,nxlg:nxrg), &
382	wall_u(nysg:nyng,nxlg:nxrg), &
383	wall_v(nysg:nyng,nxlg:nxrg), &
384	wall_w_x(nysg:nyng,nxlg:nxrg), &
385	wall_w_y(nysg:nyng,nxlg:nxrg) )
386
387
388
389	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
390
391
392	nzb_s_inner = nzb; nzb_s_outer = nzb
393	nzb_u_inner = nzb; nzb_u_outer = nzb
394	nzb_v_inner = nzb; nzb_v_outer = nzb
395	nzb_w_inner = nzb; nzb_w_outer = nzb
396
397	!
398	!-- Define vertical gridpoint from (or to) which on the usual finite difference
399	!-- form (which does not use surface fluxes) is applied
400	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
401	nzb_diff = nzb + 2
402	ELSE
403	nzb_diff = nzb + 1
404	ENDIF
405	IF ( use_top_fluxes ) THEN
406	nzt_diff = nzt - 1
407	ELSE
408	nzt_diff = nzt
409	ENDIF
410
411	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
412	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
413
414	wall_e_x = 0.0; wall_e_y = 0.0; wall_u = 0.0; wall_v = 0.0
415	wall_w_x = 0.0; wall_w_y = 0.0
416	fwxp = 1.0; fwxm = 1.0; fwyp = 1.0; fwym = 1.0
417	fxp = 1.0; fxm = 1.0; fyp = 1.0; fym = 1.0
418
419	!
420	!-- Initialize near-wall mixing length l_wall only in the vertical direction
421	!-- for the moment,
422	!-- multiplication with wall_adjustment_factor near the end of this routine
423	l_wall(nzb,:,:) = l_grid(1)
424	DO k = nzb+1, nzt
425	l_wall(k,:,:) = l_grid(k)
426	ENDDO
427	l_wall(nzt+1,:,:) = l_grid(nzt)
428
429	ALLOCATE ( vertical_influence(nzb:nzt) )
430	DO k = 1, nzt
431	vertical_influence(k) = MIN ( INT( l_grid(k) / &
432	( wall_adjustment_factor * dzw(k) ) + 0.5 ), nzt - k )
433	ENDDO
434
435	DO k = 1, MAXVAL( nzb_s_inner )
436	IF ( l_grid(k) > 1.5 * dx * wall_adjustment_factor .OR. &
437	l_grid(k) > 1.5 * dy * wall_adjustment_factor ) THEN
438	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
439	'threshold given by only local', &
440	' &horizontal reduction of near_wall ', &
441	'mixing length l_wall', &
442	' &starting from height level k = ', k, '.'
443	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
444	EXIT
445	ENDIF
446	ENDDO
447	vertical_influence(0) = vertical_influence(1)
448
449	DO i = nxlg, nxrg
450	DO j = nysg, nyng
451	DO k = nzb_s_inner(j,i) + 1, &
452	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
453	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
454	ENDDO
455	ENDDO
456	ENDDO
457
458	!
459	!-- Set outer and inner index arrays for non-flat topography.
460	!-- Here consistency checks concerning domain size and periodicity are
461	!-- necessary.
462	!-- Within this SELECT CASE structure only nzb_local is initialized
463	!-- individually depending on the chosen topography type, all other index
464	!-- arrays are initialized further below.
465	SELECT CASE ( TRIM( topography ) )
466
467	CASE ( 'flat' )
468	!
469	!-- nzb_local is required for the multigrid solver
470	nzb_local = 0
471
472	CASE ( 'single_building' )
473	!
474	!-- Single rectangular building, by default centered in the middle of the
475	!-- total domain
476	blx = NINT( building_length_x / dx )
477	bly = NINT( building_length_y / dy )
478	bh = NINT( building_height / dz )
479
480	IF ( building_wall_left == 9999999.9 ) THEN
481	building_wall_left = ( nx + 1 - blx ) / 2 * dx
482	ENDIF
483	bxl = NINT( building_wall_left / dx )
484	bxr = bxl + blx
485
486	IF ( building_wall_south == 9999999.9 ) THEN
487	building_wall_south = ( ny + 1 - bly ) / 2 * dy
488	ENDIF
489	bys = NINT( building_wall_south / dy )
490	byn = bys + bly
491
492	!
493	!-- Building size has to meet some requirements
494	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
495	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
496	WRITE( message_string, * ) 'inconsistent building parameters:', &
497	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
498	'byn=', byn, 'nx=', nx, 'ny=', ny
499	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
500	ENDIF
501
502	!
503	!-- Define the building.
504	nzb_local = 0
505	nzb_local(bys:byn,bxl:bxr) = bh
506
507	CASE ( 'single_street_canyon' )
508	!
509	!-- Single quasi-2D street canyon of infinite length in x or y direction.
510	!-- The canyon is centered in the other direction by default.
511	IF ( canyon_width_x /= 9999999.9 ) THEN
512	!
513	!-- Street canyon in y direction
514	cwx = NINT( canyon_width_x / dx )
515	IF ( canyon_wall_left == 9999999.9 ) THEN
516	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
517	ENDIF
518	cxl = NINT( canyon_wall_left / dx )
519	cxr = cxl + cwx
520
521	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
522	!
523	!-- Street canyon in x direction
524	cwy = NINT( canyon_width_y / dy )
525	IF ( canyon_wall_south == 9999999.9 ) THEN
526	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
527	ENDIF
528	cys = NINT( canyon_wall_south / dy )
529	cyn = cys + cwy
530
531	ELSE
532
533	message_string = 'no street canyon width given'
534	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
535
536	ENDIF
537
538	ch = NINT( canyon_height / dz )
539	dp_level_ind_b = ch
540	!
541	!-- Street canyon size has to meet some requirements
542	IF ( canyon_width_x /= 9999999.9 ) THEN
543	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
544	( ch < 3 ) ) THEN
545	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
546	'&cxl=', cxl, 'cxr=', cxr, &
547	'cwx=', cwx, &
548	'ch=', ch, 'nx=', nx, 'ny=', ny
549	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
550	ENDIF
551	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
552	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
553	( ch < 3 ) ) THEN
554	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
555	'&cys=', cys, 'cyn=', cyn, &
556	'cwy=', cwy, &
557	'ch=', ch, 'nx=', nx, 'ny=', ny
558	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
559	ENDIF
560	ENDIF
561	IF ( canyon_width_x /= 9999999.9 .AND. canyon_width_y /= 9999999.9 ) &
562	THEN
563	message_string = 'inconsistent canyon parameters:' // &
564	'&street canyon can only be oriented' // &
565	'&either in x- or in y-direction'
566	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
567	ENDIF
568
569	nzb_local = ch
570	IF ( canyon_width_x /= 9999999.9 ) THEN
571	nzb_local(:,cxl+1:cxr-1) = 0
572	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
573	nzb_local(cys+1:cyn-1,:) = 0
574	ENDIF
575
576	CASE ( 'read_from_file' )
577
578	ALLOCATE ( topo_height(0:ny,0:nx) )
579
580	DO ii = 0, io_blocks-1
581	IF ( ii == io_group ) THEN
582
583	!
584	!-- Arbitrary irregular topography data in PALM format (exactly
585	!-- matching the grid size and total domain size)
586	OPEN( 90, FILE='TOPOGRAPHY_DATA', STATUS='OLD', &
587	FORM='FORMATTED', ERR=10 )
588	DO j = ny, 0, -1
589	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
590	ENDDO
591
592	GOTO 12
593
594	10 message_string = 'file TOPOGRAPHY_DATA does not exist'
595	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
596
597	11 message_string = 'errors in file TOPOGRAPHY_DATA'
598	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
599
600	12 CLOSE( 90 )
601
602	ENDIF
603	#if defined( __parallel ) && ! defined ( __check )
604	CALL MPI_BARRIER( comm2d, ierr )
605	#endif
606	ENDDO
607
608	!
609	!-- Calculate the index height of the topography
610	DO i = 0, nx
611	DO j = 0, ny
612	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
613	ENDDO
614	ENDDO
615
616	DEALLOCATE ( topo_height )
617	!
618	!-- Add cyclic boundaries (additional layers are for calculating
619	!-- flag arrays needed for the multigrid sover)
620	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
621	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
622	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
623	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
624
625	CASE DEFAULT
626	!
627	!-- The DEFAULT case is reached either if the parameter topography
628	!-- contains a wrong character string or if the user has defined a special
629	!-- case in the user interface. There, the subroutine user_init_grid
630	!-- checks which of these two conditions applies.
631	CALL user_init_grid( gls, nzb_local )
632
633	END SELECT
634	!
635	!-- Determine the maximum level of topography. Furthermore it is used for
636	!-- steering the degradation of order of the applied advection scheme.
637	!-- In case of non-cyclic lateral boundaries, the order of the advection
638	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
639	nzb_max = MAXVAL( nzb_local )
640	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
641	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
642	nzb_max = nzt
643	ENDIF
644
645	!
646	!-- Consistency checks and index array initialization are only required for
647	!-- non-flat topography, also the initialization of topography height arrays
648	!-- zu_s_inner and zw_w_inner
649	IF ( TRIM( topography ) /= 'flat' ) THEN
650
651	!
652	!-- Consistency checks
653	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
654	WRITE( message_string, * ) 'nzb_local values are outside the', &
655	'model domain', &
656	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
657	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
658	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
659	ENDIF
660
661	IF ( bc_lr == 'cyclic' ) THEN
662	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
663	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
664	message_string = 'nzb_local does not fulfill cyclic' // &
665	' boundary condition in x-direction'
666	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
667	ENDIF
668	ENDIF
669	IF ( bc_ns == 'cyclic' ) THEN
670	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
671	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
672	message_string = 'nzb_local does not fulfill cyclic' // &
673	' boundary condition in y-direction'
674	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
675	ENDIF
676	ENDIF
677
678	IF ( topography_grid_convention == 'cell_edge' ) THEN
679	!
680	!-- The array nzb_local as defined using the 'cell_edge' convention
681	!-- describes the actual total size of topography which is defined at the
682	!-- cell edges where u=0 on the topography walls in x-direction and v=0
683	!-- on the topography walls in y-direction. However, PALM uses individual
684	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
685	!-- Therefore, the extent of topography in nzb_local is now reduced by
686	!-- 1dx at the E topography walls and by 1dy at the N topography walls
687	!-- to form the basis for nzb_s_inner.
688	DO j = -gls, ny + gls
689	DO i = -gls, nx
690	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
691	ENDDO
692	ENDDO
693	!-- apply cyclic boundary conditions in x-direction
694	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
695	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
696	DO i = -gls, nx + gls
697	DO j = -gls, ny
698	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
699	ENDDO
700	ENDDO
701	!-- apply cyclic boundary conditions in y-direction
702	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
703	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
704	ENDIF
705
706	!
707	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
708	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
709	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
710
711	!
712	!-- Initialize remaining index arrays:
713	!-- first pre-initialize them with nzb_s_inner...
714	nzb_u_inner = nzb_s_inner
715	nzb_u_outer = nzb_s_inner
716	nzb_v_inner = nzb_s_inner
717	nzb_v_outer = nzb_s_inner
718	nzb_w_outer = nzb_s_inner
719	nzb_s_outer = nzb_s_inner
720
721	!
722	!-- ...then extend pre-initialized arrays in their according directions
723	!-- based on nzb_local using nzb_tmp as a temporary global index array
724
725	!
726	!-- nzb_s_outer:
727	!-- extend nzb_local east-/westwards first, then north-/southwards
728	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
729	DO j = -1, ny + 1
730	DO i = 0, nx
731	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
732	nzb_local(j,i+1) )
733	ENDDO
734	ENDDO
735	DO i = nxl, nxr
736	DO j = nys, nyn
737	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
738	nzb_tmp(j+1,i) )
739	ENDDO
740	!
741	!-- non-cyclic boundary conditions (overwritten by call of
742	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
743	IF ( nys == 0 ) THEN
744	j = -1
745	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
746	ENDIF
747	IF ( nys == ny ) THEN
748	j = ny + 1
749	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
750	ENDIF
751	ENDDO
752	!
753	!-- nzb_w_outer:
754	!-- identical to nzb_s_outer
755	nzb_w_outer = nzb_s_outer
756
757	!
758	!-- nzb_u_inner:
759	!-- extend nzb_local rightwards only
760	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
761	DO j = -1, ny + 1
762	DO i = 0, nx + 1
763	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
764	ENDDO
765	ENDDO
766	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
767
768	!
769	!-- nzb_u_outer:
770	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
771	DO i = nxl, nxr
772	DO j = nys, nyn
773	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
774	nzb_tmp(j+1,i) )
775	ENDDO
776	!
777	!-- non-cyclic boundary conditions (overwritten by call of
778	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
779	IF ( nys == 0 ) THEN
780	j = -1
781	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
782	ENDIF
783	IF ( nys == ny ) THEN
784	j = ny + 1
785	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
786	ENDIF
787	ENDDO
788
789	!
790	!-- nzb_v_inner:
791	!-- extend nzb_local northwards only
792	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
793	DO i = -1, nx + 1
794	DO j = 0, ny + 1
795	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
796	ENDDO
797	ENDDO
798	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
799
800	!
801	!-- nzb_v_outer:
802	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
803	DO j = nys, nyn
804	DO i = nxl, nxr
805	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
806	nzb_tmp(j,i+1) )
807	ENDDO
808	!
809	!-- non-cyclic boundary conditions (overwritten by call of
810	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
811	IF ( nxl == 0 ) THEN
812	i = -1
813	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
814	ENDIF
815	IF ( nxr == nx ) THEN
816	i = nx + 1
817	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
818	ENDIF
819	ENDDO
820	#if ! defined ( __check )
821	!
822	!-- Exchange of lateral boundary values (parallel computers) and cyclic
823	!-- boundary conditions, if applicable.
824	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
825	!-- they do not require exchange and are not included here.
826	CALL exchange_horiz_2d_int( nzb_u_inner )
827	CALL exchange_horiz_2d_int( nzb_u_outer )
828	CALL exchange_horiz_2d_int( nzb_v_inner )
829	CALL exchange_horiz_2d_int( nzb_v_outer )
830	CALL exchange_horiz_2d_int( nzb_w_outer )
831	CALL exchange_horiz_2d_int( nzb_s_outer )
832
833	!
834	!-- Allocate and set the arrays containing the topography height
835	IF ( myid == 0 ) THEN
836
837	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
838
839	DO i = 0, nx + 1
840	DO j = 0, ny + 1
841	zu_s_inner(i,j) = zu(nzb_local(j,i))
842	zw_w_inner(i,j) = zw(nzb_local(j,i))
843	ENDDO
844	ENDDO
845
846	ENDIF
847	#endif
848	ENDIF
849
850	#if ! defined ( __check )
851	!
852	!-- Preliminary: to be removed after completion of the topography code!
853	!-- Set the former default k index arrays nzb_2d
854	nzb_2d = nzb
855
856	!
857	!-- Set the individual index arrays which define the k index from which on
858	!-- the usual finite difference form (which does not use surface fluxes) is
859	!-- applied
860	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
861	nzb_diff_u = nzb_u_inner + 2
862	nzb_diff_v = nzb_v_inner + 2
863	nzb_diff_s_inner = nzb_s_inner + 2
864	nzb_diff_s_outer = nzb_s_outer + 2
865	ELSE
866	nzb_diff_u = nzb_u_inner + 1
867	nzb_diff_v = nzb_v_inner + 1
868	nzb_diff_s_inner = nzb_s_inner + 1
869	nzb_diff_s_outer = nzb_s_outer + 1
870	ENDIF
871
872	!
873	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
874	!-- for limitation of near-wall mixing length l_wall further below
875	corner_nl = 0
876	corner_nr = 0
877	corner_sl = 0
878	corner_sr = 0
879	wall_l = 0
880	wall_n = 0
881	wall_r = 0
882	wall_s = 0
883
884	DO i = nxl, nxr
885	DO j = nys, nyn
886	!
887	!-- u-component
888	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
889	wall_u(j,i) = 1.0 ! north wall (location of adjacent fluid)
890	fym(j,i) = 0.0
891	fyp(j,i) = 1.0
892	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
893	wall_u(j,i) = 1.0 ! south wall (location of adjacent fluid)
894	fym(j,i) = 1.0
895	fyp(j,i) = 0.0
896	ENDIF
897	!
898	!-- v-component
899	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
900	wall_v(j,i) = 1.0 ! rigth wall (location of adjacent fluid)
901	fxm(j,i) = 0.0
902	fxp(j,i) = 1.0
903	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
904	wall_v(j,i) = 1.0 ! left wall (location of adjacent fluid)
905	fxm(j,i) = 1.0
906	fxp(j,i) = 0.0
907	ENDIF
908	!
909	!-- w-component, also used for scalars, separate arrays for shear
910	!-- production of tke
911	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
912	wall_e_y(j,i) = 1.0 ! north wall (location of adjacent fluid)
913	wall_w_y(j,i) = 1.0
914	fwym(j,i) = 0.0
915	fwyp(j,i) = 1.0
916	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
917	wall_e_y(j,i) = -1.0 ! south wall (location of adjacent fluid)
918	wall_w_y(j,i) = 1.0
919	fwym(j,i) = 1.0
920	fwyp(j,i) = 0.0
921	ENDIF
922	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
923	wall_e_x(j,i) = 1.0 ! right wall (location of adjacent fluid)
924	wall_w_x(j,i) = 1.0
925	fwxm(j,i) = 0.0
926	fwxp(j,i) = 1.0
927	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
928	wall_e_x(j,i) = -1.0 ! left wall (location of adjacent fluid)
929	wall_w_x(j,i) = 1.0
930	fwxm(j,i) = 1.0
931	fwxp(j,i) = 0.0
932	ENDIF
933	!
934	!-- Wall and corner locations inside buildings for limitation of
935	!-- near-wall mixing length l_wall
936	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
937
938	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
939
940	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
941	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
942	nzb_s_inner(j,i-1) ) + 1
943	ENDIF
944
945	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
946	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
947	nzb_s_inner(j,i+1) ) + 1
948	ENDIF
949
950	ENDIF
951
952	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
953
954	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
955	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
956	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
957	nzb_s_inner(j,i-1) ) + 1
958	ENDIF
959
960	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
961	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
962	nzb_s_inner(j,i+1) ) + 1
963	ENDIF
964
965	ENDIF
966
967	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
968	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
969	ENDIF
970
971	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
972	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
973	ENDIF
974
975	ENDDO
976	ENDDO
977
978	!
979	!-- Calculate wall flag arrays for the multigrid method
980	IF ( psolver == 'multigrid' ) THEN
981	!
982	!-- Gridpoint increment of the current level
983	inc = 1
984
985	DO l = maximum_grid_level, 1 , -1
986
987	nxl_l = nxl_mg(l)
988	nxr_l = nxr_mg(l)
989	nys_l = nys_mg(l)
990	nyn_l = nyn_mg(l)
991	nzt_l = nzt_mg(l)
992
993	!
994	!-- Assign the flag level to be calculated
995	SELECT CASE ( l )
996	CASE ( 1 )
997	flags => wall_flags_1
998	CASE ( 2 )
999	flags => wall_flags_2
1000	CASE ( 3 )
1001	flags => wall_flags_3
1002	CASE ( 4 )
1003	flags => wall_flags_4
1004	CASE ( 5 )
1005	flags => wall_flags_5
1006	CASE ( 6 )
1007	flags => wall_flags_6
1008	CASE ( 7 )
1009	flags => wall_flags_7
1010	CASE ( 8 )
1011	flags => wall_flags_8
1012	CASE ( 9 )
1013	flags => wall_flags_9
1014	CASE ( 10 )
1015	flags => wall_flags_10
1016	END SELECT
1017
1018	!
1019	!-- Depending on the grid level, set the respective bits in case of
1020	!-- neighbouring walls
1021	!-- Bit 0: wall to the bottom
1022	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1023	!-- Bit 2: wall to the south
1024	!-- Bit 3: wall to the north
1025	!-- Bit 4: wall to the left
1026	!-- Bit 5: wall to the right
1027	!-- Bit 6: inside building
1028
1029	flags = 0
1030
1031	!
1032	!-- In case of masking method, flags are not set and multigrid method
1033	!-- works like FFT-solver
1034	IF ( .NOT. masking_method ) THEN
1035
1036	DO i = nxl_l-1, nxr_l+1
1037	DO j = nys_l-1, nyn_l+1
1038	DO k = nzb, nzt_l+1
1039
1040	!
1041	!-- Inside/outside building (inside building does not need
1042	!-- further tests for walls)
1043	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1044
1045	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1046
1047	ELSE
1048	!
1049	!-- Bottom wall
1050	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1051	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1052	ENDIF
1053	!
1054	!-- South wall
1055	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1056	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1057	ENDIF
1058	!
1059	!-- North wall
1060	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1061	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1062	ENDIF
1063	!
1064	!-- Left wall
1065	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1066	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1067	ENDIF
1068	!
1069	!-- Right wall
1070	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1071	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1072	ENDIF
1073
1074	ENDIF
1075
1076	ENDDO
1077	ENDDO
1078	ENDDO
1079
1080	ENDIF
1081
1082	!
1083	!-- Test output of flag arrays
1084	! i = nxl_l
1085	! WRITE (9,*) ' '
1086	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1087	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1088	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1089	! DO k = nzt_l+1, nzb, -1
1090	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1091	! ENDDO
1092
1093	inc = inc * 2
1094
1095	ENDDO
1096
1097	ENDIF
1098	!
1099	!-- Allocate flags needed for masking walls.
1100	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr) )
1101	wall_flags_0 = 0
1102
1103	IF ( scalar_advec == 'ws-scheme' ) THEN
1104	!
1105	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1106	!-- near topography, inflow- and outflow boundaries as well as bottom and
1107	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1108	!-- grid points.
1109	DO i = nxl, nxr
1110	DO j = nys, nyn
1111	DO k = nzb_s_inner(j,i)+1, nzt
1112	!
1113	!-- scalar - x-direction
1114	!-- WS1 (0), WS3 (1), WS5 (2)
1115	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1116	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1117	.AND. i == nxr ) ) THEN
1118	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1119	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1120	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1121	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1122	) THEN
1123	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1124	ELSE
1125	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1126	ENDIF
1127	!
1128	!-- scalar - y-direction
1129	!-- WS1 (3), WS3 (4), WS5 (5)
1130	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1131	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1132	.AND. j == nyn ) ) THEN
1133	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1134	!-- WS3
1135	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1136	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1137	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1138	) THEN
1139	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1140	!-- WS5
1141	ELSE
1142	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1143	ENDIF
1144	!
1145	!-- scalar - z-direction
1146	!-- WS1 (6), WS3 (7), WS5 (8)
1147	flag_set = .FALSE.
1148	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1149	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1150	flag_set = .TRUE.
1151	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1152	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1153	flag_set = .TRUE.
1154	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1155	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1156	ENDIF
1157	ENDDO
1158	ENDDO
1159	ENDDO
1160	ENDIF
1161
1162	IF ( momentum_advec == 'ws-scheme' ) THEN
1163	!
1164	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1165	!-- near topography, inflow- and outflow boundaries as well as bottom and
1166	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1167	!-- grid points.
1168	DO i = nxl, nxr
1169	DO j = nys, nyn
1170	DO k = nzb_u_inner(j,i)+1, nzt
1171	!
1172	!-- u component - x-direction
1173	!-- WS1 (9), WS3 (10), WS5 (11)
1174	IF ( k <= nzb_u_inner(j,i+1) &
1175	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1176	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
1177	) THEN
1178	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1179	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1180	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
1181	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
1182	) THEN
1183	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1184	ELSE
1185	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1186	ENDIF
1187
1188	!
1189	!-- u component - y-direction
1190	!-- WS1 (12), WS3 (13), WS5 (14)
1191	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1192	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1193	.AND. j == nyn ) ) THEN
1194	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1195	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1196	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1197	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1198	) THEN
1199	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1200	ELSE
1201	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1202	ENDIF
1203	!
1204	!-- u component - z-direction
1205	!-- WS1 (15), WS3 (16), WS5 (17)
1206	flag_set = .FALSE.
1207	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1208	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1209	flag_set = .TRUE.
1210	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1211	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1212	flag_set = .TRUE.
1213	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1214	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1215	ENDIF
1216
1217	ENDDO
1218	ENDDO
1219	ENDDO
1220
1221	DO i = nxl, nxr
1222	DO j = nys, nyn
1223	DO k = nzb_v_inner(j,i)+1, nzt
1224	!
1225	!-- v component - x-direction
1226	!-- WS1 (18), WS3 (19), WS5 (20)
1227	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1228	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
1229	.AND. i == nxr ) ) THEN
1230	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1231	!-- WS3
1232	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1233	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1234	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1235	) THEN
1236	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1237	ELSE
1238	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1239	ENDIF
1240	!
1241	!-- v component - y-direction
1242	!-- WS1 (21), WS3 (22), WS5 (23)
1243	IF ( k <= nzb_v_inner(j+1,i) &
1244	.OR. ( ( inflow_s .OR. outflow_s ) .AND. i == nysv ) &
1245	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
1246	) THEN
1247	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1248	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1249	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
1250	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
1251	) THEN
1252	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1253	ELSE
1254	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1255	ENDIF
1256	!
1257	!-- v component - z-direction
1258	!-- WS1 (24), WS3 (25), WS5 (26)
1259	flag_set = .FALSE.
1260	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1261	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1262	flag_set = .TRUE.
1263	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1264	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1265	flag_set = .TRUE.
1266	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1267	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1268	ENDIF
1269
1270	ENDDO
1271	ENDDO
1272	ENDDO
1273	DO i = nxl, nxr
1274	DO j = nys, nyn
1275	DO k = nzb_w_inner(j,i), nzt
1276	!
1277	!-- w component - x-direction
1278	!-- WS1 (27), WS3 (28), WS5 (29)
1279	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1280	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1281	.AND. i == nxr ) ) THEN
1282	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1283	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1284	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1285	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1286	) THEN
1287	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1288	ELSE
1289	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1290	ENDIF
1291	!
1292	!-- w component - y-direction
1293	!-- WS1 (30), WS3 (31), WS5 (32)
1294	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1295	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1296	.AND. j == nyn ) ) THEN
1297	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1298	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1299	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1300	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1301	) THEN
1302	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1303	ELSE
1304	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 32 )
1305	ENDIF
1306	!
1307	!-- w component - z-direction
1308	!-- WS1 (33), WS3 (34), WS5 (35)
1309	flag_set = .FALSE.
1310	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1311	.OR. k == nzt ) THEN
1312	!
1313	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1314	!-- set, although this is not a prognostic level. However,
1315	!-- contrary to the advection of u,v and s this is necessary
1316	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1317	!-- at k == nzb_w_inner(j,i)+1.
1318	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 33 )
1319	flag_set = .TRUE.
1320	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1321	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 34 )
1322	flag_set = .TRUE.
1323	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1324	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 35 )
1325	ENDIF
1326
1327	ENDDO
1328	ENDDO
1329	ENDDO
1330
1331	ENDIF
1332
1333	!
1334	!-- In case of topography: limit near-wall mixing length l_wall further:
1335	!-- Go through all points of the subdomain one by one and look for the closest
1336	!-- surface
1337	IF ( TRIM(topography) /= 'flat' ) THEN
1338	DO i = nxl, nxr
1339	DO j = nys, nyn
1340
1341	nzb_si = nzb_s_inner(j,i)
1342	vi = vertical_influence(nzb_si)
1343
1344	IF ( wall_n(j,i) > 0 ) THEN
1345	!
1346	!-- North wall (y distance)
1347	DO k = wall_n(j,i), nzb_si
1348	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5 * dy )
1349	ENDDO
1350	!
1351	!-- Above North wall (yz distance)
1352	DO k = nzb_si + 1, nzb_si + vi
1353	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1354	SQRT( 0.25 * dy**2 + &
1355	( zu(k) - zw(nzb_si) )**2 ) )
1356	ENDDO
1357	!
1358	!-- Northleft corner (xy distance)
1359	IF ( corner_nl(j,i) > 0 ) THEN
1360	DO k = corner_nl(j,i), nzb_si
1361	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1362	0.5 * SQRT( dx2 + dy2 ) )
1363	ENDDO
1364	!
1365	!-- Above Northleft corner (xyz distance)
1366	DO k = nzb_si + 1, nzb_si + vi
1367	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1368	SQRT( 0.25 * (dx2 + dy2) + &
1369	( zu(k) - zw(nzb_si) )**2 ) )
1370	ENDDO
1371	ENDIF
1372	!
1373	!-- Northright corner (xy distance)
1374	IF ( corner_nr(j,i) > 0 ) THEN
1375	DO k = corner_nr(j,i), nzb_si
1376	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1377	0.5 * SQRT( dx2 + dy2 ) )
1378	ENDDO
1379	!
1380	!-- Above northright corner (xyz distance)
1381	DO k = nzb_si + 1, nzb_si + vi
1382	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1383	SQRT( 0.25 * (dx2 + dy2) + &
1384	( zu(k) - zw(nzb_si) )**2 ) )
1385	ENDDO
1386	ENDIF
1387	ENDIF
1388
1389	IF ( wall_s(j,i) > 0 ) THEN
1390	!
1391	!-- South wall (y distance)
1392	DO k = wall_s(j,i), nzb_si
1393	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5 * dy )
1394	ENDDO
1395	!
1396	!-- Above south wall (yz distance)
1397	DO k = nzb_si + 1, &
1398	nzb_si + vi
1399	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1400	SQRT( 0.25 * dy**2 + &
1401	( zu(k) - zw(nzb_si) )**2 ) )
1402	ENDDO
1403	!
1404	!-- Southleft corner (xy distance)
1405	IF ( corner_sl(j,i) > 0 ) THEN
1406	DO k = corner_sl(j,i), nzb_si
1407	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1408	0.5 * SQRT( dx2 + dy2 ) )
1409	ENDDO
1410	!
1411	!-- Above southleft corner (xyz distance)
1412	DO k = nzb_si + 1, nzb_si + vi
1413	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1414	SQRT( 0.25 * (dx2 + dy2) + &
1415	( zu(k) - zw(nzb_si) )**2 ) )
1416	ENDDO
1417	ENDIF
1418	!
1419	!-- Southright corner (xy distance)
1420	IF ( corner_sr(j,i) > 0 ) THEN
1421	DO k = corner_sr(j,i), nzb_si
1422	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1423	0.5 * SQRT( dx2 + dy2 ) )
1424	ENDDO
1425	!
1426	!-- Above southright corner (xyz distance)
1427	DO k = nzb_si + 1, nzb_si + vi
1428	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1429	SQRT( 0.25 * (dx2 + dy2) + &
1430	( zu(k) - zw(nzb_si) )**2 ) )
1431	ENDDO
1432	ENDIF
1433
1434	ENDIF
1435
1436	IF ( wall_l(j,i) > 0 ) THEN
1437	!
1438	!-- Left wall (x distance)
1439	DO k = wall_l(j,i), nzb_si
1440	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5 * dx )
1441	ENDDO
1442	!
1443	!-- Above left wall (xz distance)
1444	DO k = nzb_si + 1, nzb_si + vi
1445	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1446	SQRT( 0.25 * dx**2 + &
1447	( zu(k) - zw(nzb_si) )**2 ) )
1448	ENDDO
1449	ENDIF
1450
1451	IF ( wall_r(j,i) > 0 ) THEN
1452	!
1453	!-- Right wall (x distance)
1454	DO k = wall_r(j,i), nzb_si
1455	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5 * dx )
1456	ENDDO
1457	!
1458	!-- Above right wall (xz distance)
1459	DO k = nzb_si + 1, nzb_si + vi
1460	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1461	SQRT( 0.25 * dx**2 + &
1462	( zu(k) - zw(nzb_si) )**2 ) )
1463	ENDDO
1464
1465	ENDIF
1466
1467	ENDDO
1468	ENDDO
1469
1470	ENDIF
1471
1472	!
1473	!-- Multiplication with wall_adjustment_factor
1474	l_wall = wall_adjustment_factor * l_wall
1475
1476	!
1477	!-- Set lateral boundary conditions for l_wall
1478	CALL exchange_horiz( l_wall, nbgp )
1479
1480	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1481	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1482
1483	#endif
1484
1485	END SUBROUTINE init_grid

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

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |