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source: palm/trunk/SOURCE/init_grid.f90 @ 1243

Last change on this file since 1243 was 1222, checked in by raasch, 11 years ago
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[1]	1	SUBROUTINE init_grid
	2
[1036]	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	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[863]	22	!
[1222]	23	!
[863]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1222 2013-09-10 14:48:09Z heinze $
	27	!
[1222]	28	! 1221 2013-09-10 08:59:13Z raasch
	29	! wall_flags_00 introduced to hold bits 32-63,
	30	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	31	! loops optimized for openACC (pres + flow_statistics)
	32	!
[1093]	33	! 1092 2013-02-02 11:24:22Z raasch
	34	! unused variables removed
	35	!
[1070]	36	! 1069 2012-11-28 16:18:43Z maronga
	37	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	38	! model in case of coupled runs
	39	!
[1037]	40	! 1036 2012-10-22 13:43:42Z raasch
	41	! code put under GPL (PALM 3.9)
	42	!
[1017]	43	! 1015 2012-09-27 09:23:24Z raasch
	44	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	45	! nzb_w_inner+1
	46	!
[997]	47	! 996 2012-09-07 10:41:47Z raasch
	48	! little reformatting
	49	!
[979]	50	! 978 2012-08-09 08:28:32Z fricke
	51	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	52	! Bugfix: Set wall_flags_0 for inflow boundary
	53	!
[928]	54	! 927 2012-06-06 19:15:04Z raasch
	55	! Wall flags are not set for multigrid method in case of masking method
	56	!
[865]	57	! 864 2012-03-27 15:10:33Z gryschka
[927]	58	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	59	! were not correctly defined for k=1.
[865]	60	!
[863]	61	! 861 2012-03-26 14:18:34Z suehring
[861]	62	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	63	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	64	! model domain.!
[861]	65	! Initialization of nzb_s_inner and nzb_w_inner.
	66	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	67	! while setting wall_flags_0
	68	!
[844]	69	! 843 2012-02-29 15:16:21Z gryschka
	70	! In case of ocean and dirichlet bc for u and v at the bottom
	71	! the first u-level ist defined at same height as the first w-level
	72	!
[819]	73	! 818 2012-02-08 16:11:23Z maronga
	74	! Bugfix: topo_height is only required if topography is used. It is thus now
	75	! allocated in the topography branch
	76	!
[810]	77	! 809 2012-01-30 13:32:58Z maronga
	78	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	79	!
[808]	80	! 807 2012-01-25 11:53:51Z maronga
	81	! New cpp directive "__check" implemented which is used by check_namelist_files
	82	!
[760]	83	! 759 2011-09-15 13:58:31Z raasch
	84	! Splitting of parallel I/O in blocks of PEs
	85	!
[723]	86	! 722 2011-04-11 06:21:09Z raasch
	87	! Bugfix: bc_lr/ns_cyc replaced by bc_lr/ns, because variables are not yet set
	88	! here
	89	!
[710]	90	! 709 2011-03-30 09:31:40Z raasch
	91	! formatting adjustments
	92	!
[708]	93	! 707 2011-03-29 11:39:40Z raasch
	94	! bc_lr/ns replaced by bc_lr/ns_cyc
	95	!
[668]	96	! 667 2010-12-23 12:06:00Z suehring/gryschka
[667]	97	! Definition of new array bounds nxlg, nxrg, nysg, nyng on each PE.
	98	! Furthermore the allocation of arrays and steering of loops is done with these
	99	! parameters. Call of exchange_horiz are modified.
	100	! In case of dirichlet bounday condition at the bottom zu(0)=0.0
	101	! dzu_mg has to be set explicitly for a equally spaced grid near bottom.
	102	! ddzu_pres added to use a equally spaced grid near bottom.
[139]	103	!
[556]	104	! 555 2010-09-07 07:32:53Z raasch
[818]	105	! Bugfix: default setting of nzb_local for flat topography
[556]	106	!
[392]	107	! 274 2009-03-26 15:11:21Z heinze
	108	! Output of messages replaced by message handling routine.
	109	! new topography case 'single_street_canyon'
	110	!
[226]	111	! 217 2008-12-09 18:00:48Z letzel
	112	! +topography_grid_convention
	113	!
[139]	114	! 134 2007-11-21 07:28:38Z letzel
[134]	115	! Redefine initial nzb_local as the actual total size of topography (later the
	116	! extent of topography in nzb_local is reduced by 1dx at the E topography walls
	117	! and by 1dy at the N topography walls to form the basis for nzb_s_inner);
	118	! for consistency redefine 'single_building' case.
[114]	119	! Calculation of wall flag arrays
[1]	120	!
[98]	121	! 94 2007-06-01 15:25:22Z raasch
	122	! Grid definition for ocean version
	123	!
[77]	124	! 75 2007-03-22 09:54:05Z raasch
	125	! storage of topography height arrays zu_s_inner and zw_s_inner,
	126	! 2nd+3rd argument removed from exchange horiz
	127	!
[39]	128	! 19 2007-02-23 04:53:48Z raasch
	129	! Setting of nzt_diff
	130	!
[3]	131	! RCS Log replace by Id keyword, revision history cleaned up
	132	!
[1]	133	! Revision 1.17 2006/08/22 14:00:05 raasch
	134	! +dz_max to limit vertical stretching,
	135	! bugfix in index array initialization for line- or point-like topography
	136	! structures
	137	!
	138	! Revision 1.1 1997/08/11 06:17:45 raasch
	139	! Initial revision (Testversion)
	140	!
	141	!
	142	! Description:
	143	! ------------
	144	! Creating grid depending constants
	145	!------------------------------------------------------------------------------!
	146
	147	USE arrays_3d
	148	USE control_parameters
	149	USE grid_variables
	150	USE indices
	151	USE pegrid
	152
	153	IMPLICIT NONE
	154
[240]	155	INTEGER :: bh, blx, bly, bxl, bxr, byn, bys, ch, cwx, cwy, cxl, cxr, cyn, &
[1092]	156	cys, gls, i, ii, inc, j, k, l, nxl_l, nxr_l, nyn_l, nys_l, &
	157	nzb_si, nzt_l, vi
[1]	158
	159	INTEGER, DIMENSION(:), ALLOCATABLE :: vertical_influence
	160
	161	INTEGER, DIMENSION(:,:), ALLOCATABLE :: corner_nl, corner_nr, corner_sl, &
	162	corner_sr, wall_l, wall_n, wall_r,&
	163	wall_s, nzb_local, nzb_tmp
	164
[861]	165	LOGICAL :: flag_set = .FALSE.
	166
[1]	167	REAL :: dx_l, dy_l, dz_stretched
	168
[818]	169	REAL, DIMENSION(:,:), ALLOCATABLE :: topo_height
[1]	170
[667]	171
[1]	172	!
[709]	173	!-- Calculation of horizontal array bounds including ghost layers
[667]	174	nxlg = nxl - nbgp
	175	nxrg = nxr + nbgp
	176	nysg = nys - nbgp
	177	nyng = nyn + nbgp
[709]	178
[667]	179	!
[1]	180	!-- Allocate grid arrays
	181	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	182	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	183
	184	!
	185	!-- Compute height of u-levels from constant grid length and dz stretch factors
	186	IF ( dz == -1.0 ) THEN
[254]	187	message_string = 'missing dz'
	188	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1]	189	ELSEIF ( dz <= 0.0 ) THEN
[254]	190	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	191	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	192	ENDIF
[94]	193
[1]	194	!
[94]	195	!-- Define the vertical grid levels
	196	IF ( .NOT. ocean ) THEN
	197	!
	198	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	199	!-- The second u-level (k=1) corresponds to the top of the
[94]	200	!-- Prandtl-layer.
[667]	201
	202	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
	203	zu(0) = 0.0
	204	! zu(0) = - dz * 0.5
	205	ELSE
	206	zu(0) = - dz * 0.5
	207	ENDIF
[94]	208	zu(1) = dz * 0.5
[1]	209
[94]	210	dz_stretch_level_index = nzt+1
	211	dz_stretched = dz
	212	DO k = 2, nzt+1
	213	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	214	dz_stretched = dz_stretched * dz_stretch_factor
	215	dz_stretched = MIN( dz_stretched, dz_max )
	216	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	217	ENDIF
	218	zu(k) = zu(k-1) + dz_stretched
	219	ENDDO
[1]	220
	221	!
[94]	222	!-- Compute the w-levels. They are always staggered half-way between the
[843]	223	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	224	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	225	!-- The top w-level is extrapolated linearly.
[94]	226	zw(0) = 0.0
	227	DO k = 1, nzt
	228	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	229	ENDDO
	230	zw(nzt+1) = zw(nzt) + 2.0 * ( zu(nzt+1) - zw(nzt) )
[1]	231
[94]	232	ELSE
[1]	233	!
[843]	234	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	235	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	236	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	237	!-- w-level are defined at same height, but staggered from the second level.
	238	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[94]	239	zu(nzt+1) = dz * 0.5
	240	zu(nzt) = - dz * 0.5
	241
	242	dz_stretch_level_index = 0
	243	dz_stretched = dz
	244	DO k = nzt-1, 0, -1
	245	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
	246	dz_stretched < dz_max ) THEN
	247	dz_stretched = dz_stretched * dz_stretch_factor
	248	dz_stretched = MIN( dz_stretched, dz_max )
	249	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	250	ENDIF
	251	zu(k) = zu(k+1) - dz_stretched
	252	ENDDO
	253
	254	!
	255	!-- Compute the w-levels. They are always staggered half-way between the
[843]	256	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	257	!-- at the ground. In this case the first u- and w-level are defined at
	258	!-- same height. The top w-level (nzt+1) is not used but set for
	259	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	260	zw(nzt+1) = dz
	261	zw(nzt) = 0.0
	262	DO k = 0, nzt
	263	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	264	ENDDO
	265
[843]	266	!
	267	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	268	!-- at same height.
	269	IF ( ibc_uv_b == 0 ) THEN
	270	zu(0) = zw(0)
	271	ENDIF
	272
[94]	273	ENDIF
	274
	275	!
[1]	276	!-- Compute grid lengths.
	277	DO k = 1, nzt+1
	278	dzu(k) = zu(k) - zu(k-1)
	279	ddzu(k) = 1.0 / dzu(k)
	280	dzw(k) = zw(k) - zw(k-1)
	281	ddzw(k) = 1.0 / dzw(k)
	282	ENDDO
	283
	284	DO k = 1, nzt
	285	dd2zu(k) = 1.0 / ( dzu(k) + dzu(k+1) )
	286	ENDDO
[667]	287
	288	!
[709]	289	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	290	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	291	!-- is only dz/2, but should be dz. Therefore, an additional array
	292	!-- containing with appropriate grid information is created for these
	293	!-- solvers.
	294	IF ( psolver /= 'multigrid' ) THEN
[667]	295	ALLOCATE( ddzu_pres(1:nzt+1) )
	296	ddzu_pres = ddzu
[864]	297	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	298	ENDIF
[1]	299
	300	!
	301	!-- In case of multigrid method, compute grid lengths and grid factors for the
	302	!-- grid levels
	303	IF ( psolver == 'multigrid' ) THEN
	304
	305	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	306	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	307	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	308	f1_mg(nzb+1:nzt,maximum_grid_level), &
	309	f2_mg(nzb+1:nzt,maximum_grid_level), &
	310	f3_mg(nzb+1:nzt,maximum_grid_level) )
	311
	312	dzu_mg(:,maximum_grid_level) = dzu
[667]	313	!
[864]	314	!-- Next line to ensure an equally spaced grid.
	315	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	316
[1]	317	dzw_mg(:,maximum_grid_level) = dzw
	318	nzt_l = nzt
	319	DO l = maximum_grid_level-1, 1, -1
	320	dzu_mg(nzb+1,l) = 2.0 * dzu_mg(nzb+1,l+1)
	321	dzw_mg(nzb+1,l) = 2.0 * dzw_mg(nzb+1,l+1)
	322	nzt_l = nzt_l / 2
	323	DO k = 2, nzt_l+1
	324	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	325	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	326	ENDDO
	327	ENDDO
	328
	329	nzt_l = nzt
	330	dx_l = dx
	331	dy_l = dy
	332	DO l = maximum_grid_level, 1, -1
	333	ddx2_mg(l) = 1.0 / dx_l**2
	334	ddy2_mg(l) = 1.0 / dy_l**2
	335	DO k = nzb+1, nzt_l
	336	f2_mg(k,l) = 1.0 / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	337	f3_mg(k,l) = 1.0 / ( dzu_mg(k,l) * dzw_mg(k,l) )
	338	f1_mg(k,l) = 2.0 * ( ddx2_mg(l) + ddy2_mg(l) ) + &
	339	f2_mg(k,l) + f3_mg(k,l)
	340	ENDDO
	341	nzt_l = nzt_l / 2
	342	dx_l = dx_l * 2.0
	343	dy_l = dy_l * 2.0
	344	ENDDO
	345
	346	ENDIF
	347
	348	!
	349	!-- Compute the reciprocal values of the horizontal grid lengths.
	350	ddx = 1.0 / dx
	351	ddy = 1.0 / dy
	352	dx2 = dx * dx
	353	dy2 = dy * dy
	354	ddx2 = 1.0 / dx2
	355	ddy2 = 1.0 / dy2
	356
	357	!
	358	!-- Compute the grid-dependent mixing length.
	359	DO k = 1, nzt
	360	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333
	361	ENDDO
	362
	363	!
	364	!-- Allocate outer and inner index arrays for topography and set
[114]	365	!-- defaults.
	366	!-- nzb_local has to contain additional layers of ghost points for calculating
	367	!-- the flag arrays needed for the multigrid method
	368	gls = 2**( maximum_grid_level )
[861]	369	IF ( gls < nbgp ) gls = nbgp
[667]	370
[114]	371	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	372	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	373	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	374	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	375	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	376	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	377	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	378	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	379	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	380	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	381	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	382	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	383	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	384	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	385	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	386	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	387	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	388	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	389	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	390	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	391	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	392	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	393	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	394	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	395	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	396	wall_e_x(nysg:nyng,nxlg:nxrg), &
	397	wall_e_y(nysg:nyng,nxlg:nxrg), &
	398	wall_u(nysg:nyng,nxlg:nxrg), &
	399	wall_v(nysg:nyng,nxlg:nxrg), &
	400	wall_w_x(nysg:nyng,nxlg:nxrg), &
	401	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	402
	403
[667]	404
	405	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	406
[818]	407
[1]	408	nzb_s_inner = nzb; nzb_s_outer = nzb
	409	nzb_u_inner = nzb; nzb_u_outer = nzb
	410	nzb_v_inner = nzb; nzb_v_outer = nzb
	411	nzb_w_inner = nzb; nzb_w_outer = nzb
	412
[1221]	413	rflags_s_inner = 1.0
	414	rflags_invers = 1.0
	415
[1]	416	!
[19]	417	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	418	!-- form (which does not use surface fluxes) is applied
	419	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	420	nzb_diff = nzb + 2
	421	ELSE
	422	nzb_diff = nzb + 1
	423	ENDIF
[19]	424	IF ( use_top_fluxes ) THEN
	425	nzt_diff = nzt - 1
	426	ELSE
	427	nzt_diff = nzt
	428	ENDIF
[1]	429
	430	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	431	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	432
	433	wall_e_x = 0.0; wall_e_y = 0.0; wall_u = 0.0; wall_v = 0.0
	434	wall_w_x = 0.0; wall_w_y = 0.0
	435	fwxp = 1.0; fwxm = 1.0; fwyp = 1.0; fwym = 1.0
	436	fxp = 1.0; fxm = 1.0; fyp = 1.0; fym = 1.0
	437
	438	!
	439	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	440	!-- for the moment,
	441	!-- multiplication with wall_adjustment_factor near the end of this routine
	442	l_wall(nzb,:,:) = l_grid(1)
	443	DO k = nzb+1, nzt
	444	l_wall(k,:,:) = l_grid(k)
	445	ENDDO
	446	l_wall(nzt+1,:,:) = l_grid(nzt)
	447
	448	ALLOCATE ( vertical_influence(nzb:nzt) )
	449	DO k = 1, nzt
	450	vertical_influence(k) = MIN ( INT( l_grid(k) / &
	451	( wall_adjustment_factor * dzw(k) ) + 0.5 ), nzt - k )
	452	ENDDO
	453
	454	DO k = 1, MAXVAL( nzb_s_inner )
	455	IF ( l_grid(k) > 1.5 * dx * wall_adjustment_factor .OR. &
	456	l_grid(k) > 1.5 * dy * wall_adjustment_factor ) THEN
[254]	457	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	458	'threshold given by only local', &
	459	' &horizontal reduction of near_wall ', &
	460	'mixing length l_wall', &
	461	' &starting from height level k = ', k, '.'
	462	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	463	EXIT
	464	ENDIF
	465	ENDDO
	466	vertical_influence(0) = vertical_influence(1)
	467
[667]	468	DO i = nxlg, nxrg
	469	DO j = nysg, nyng
[1]	470	DO k = nzb_s_inner(j,i) + 1, &
	471	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	472	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	473	ENDDO
	474	ENDDO
	475	ENDDO
	476
	477	!
	478	!-- Set outer and inner index arrays for non-flat topography.
	479	!-- Here consistency checks concerning domain size and periodicity are
	480	!-- necessary.
	481	!-- Within this SELECT CASE structure only nzb_local is initialized
	482	!-- individually depending on the chosen topography type, all other index
	483	!-- arrays are initialized further below.
	484	SELECT CASE ( TRIM( topography ) )
	485
	486	CASE ( 'flat' )
	487	!
[555]	488	!-- nzb_local is required for the multigrid solver
	489	nzb_local = 0
[1]	490
	491	CASE ( 'single_building' )
	492	!
	493	!-- Single rectangular building, by default centered in the middle of the
	494	!-- total domain
	495	blx = NINT( building_length_x / dx )
	496	bly = NINT( building_length_y / dy )
	497	bh = NINT( building_height / dz )
	498
	499	IF ( building_wall_left == 9999999.9 ) THEN
	500	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	501	ENDIF
	502	bxl = NINT( building_wall_left / dx )
	503	bxr = bxl + blx
	504
	505	IF ( building_wall_south == 9999999.9 ) THEN
	506	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	507	ENDIF
	508	bys = NINT( building_wall_south / dy )
	509	byn = bys + bly
	510
	511	!
	512	!-- Building size has to meet some requirements
	513	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	514	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	515	WRITE( message_string, * ) 'inconsistent building parameters:', &
	516	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	517	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	518	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	519	ENDIF
	520
	521	!
[217]	522	!-- Define the building.
[1]	523	nzb_local = 0
[134]	524	nzb_local(bys:byn,bxl:bxr) = bh
[1]	525
[240]	526	CASE ( 'single_street_canyon' )
	527	!
	528	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	529	!-- The canyon is centered in the other direction by default.
	530	IF ( canyon_width_x /= 9999999.9 ) THEN
	531	!
	532	!-- Street canyon in y direction
	533	cwx = NINT( canyon_width_x / dx )
	534	IF ( canyon_wall_left == 9999999.9 ) THEN
	535	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	536	ENDIF
	537	cxl = NINT( canyon_wall_left / dx )
	538	cxr = cxl + cwx
	539
	540	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	541	!
	542	!-- Street canyon in x direction
	543	cwy = NINT( canyon_width_y / dy )
	544	IF ( canyon_wall_south == 9999999.9 ) THEN
	545	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	546	ENDIF
	547	cys = NINT( canyon_wall_south / dy )
	548	cyn = cys + cwy
	549
	550	ELSE
[254]	551
	552	message_string = 'no street canyon width given'
	553	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	554
[240]	555	ENDIF
	556
	557	ch = NINT( canyon_height / dz )
	558	dp_level_ind_b = ch
	559	!
	560	!-- Street canyon size has to meet some requirements
	561	IF ( canyon_width_x /= 9999999.9 ) THEN
	562	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
	563	( ch < 3 ) ) THEN
[254]	564	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	565	'&cxl=', cxl, 'cxr=', cxr, &
	566	'cwx=', cwx, &
[254]	567	'ch=', ch, 'nx=', nx, 'ny=', ny
	568	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	569	ENDIF
	570	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	571	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
	572	( ch < 3 ) ) THEN
[254]	573	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	574	'&cys=', cys, 'cyn=', cyn, &
	575	'cwy=', cwy, &
[254]	576	'ch=', ch, 'nx=', nx, 'ny=', ny
	577	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	578	ENDIF
	579	ENDIF
[274]	580	IF ( canyon_width_x /= 9999999.9 .AND. canyon_width_y /= 9999999.9 ) &
[240]	581	THEN
[274]	582	message_string = 'inconsistent canyon parameters:' // &
[254]	583	'&street canyon can only be oriented' // &
	584	'&either in x- or in y-direction'
	585	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	586	ENDIF
	587
	588	nzb_local = ch
	589	IF ( canyon_width_x /= 9999999.9 ) THEN
	590	nzb_local(:,cxl+1:cxr-1) = 0
	591	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	592	nzb_local(cys+1:cyn-1,:) = 0
	593	ENDIF
	594
[1]	595	CASE ( 'read_from_file' )
[759]	596
[818]	597	ALLOCATE ( topo_height(0:ny,0:nx) )
	598
[759]	599	DO ii = 0, io_blocks-1
	600	IF ( ii == io_group ) THEN
	601
[1]	602	!
[759]	603	!-- Arbitrary irregular topography data in PALM format (exactly
	604	!-- matching the grid size and total domain size)
[1069]	605	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	606	FORM='FORMATTED', ERR=10 )
	607	DO j = ny, 0, -1
	608	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	609	ENDDO
	610
	611	GOTO 12
	612
[1069]	613	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	614	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	615
[1069]	616	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	617	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	618
	619	12 CLOSE( 90 )
	620
	621	ENDIF
[809]	622	#if defined( __parallel ) && ! defined ( __check )
[759]	623	CALL MPI_BARRIER( comm2d, ierr )
	624	#endif
[559]	625	ENDDO
[759]	626
[1]	627	!
	628	!-- Calculate the index height of the topography
	629	DO i = 0, nx
	630	DO j = 0, ny
	631	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	632	ENDDO
	633	ENDDO
[818]	634
	635	DEALLOCATE ( topo_height )
[114]	636	!
[759]	637	!-- Add cyclic boundaries (additional layers are for calculating
	638	!-- flag arrays needed for the multigrid sover)
[114]	639	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	640	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	641	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	642	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	643
[1]	644	CASE DEFAULT
	645	!
	646	!-- The DEFAULT case is reached either if the parameter topography
[217]	647	!-- contains a wrong character string or if the user has defined a special
[1]	648	!-- case in the user interface. There, the subroutine user_init_grid
	649	!-- checks which of these two conditions applies.
[114]	650	CALL user_init_grid( gls, nzb_local )
[1]	651
	652	END SELECT
	653	!
[861]	654	!-- Determine the maximum level of topography. Furthermore it is used for
	655	!-- steering the degradation of order of the applied advection scheme.
[978]	656	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	657	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	658	nzb_max = MAXVAL( nzb_local )
[978]	659	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
	660	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	661	nzb_max = nzt
	662	ENDIF
	663
[861]	664	!
[1]	665	!-- Consistency checks and index array initialization are only required for
[217]	666	!-- non-flat topography, also the initialization of topography height arrays
[49]	667	!-- zu_s_inner and zw_w_inner
[1]	668	IF ( TRIM( topography ) /= 'flat' ) THEN
	669
	670	!
	671	!-- Consistency checks
	672	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[274]	673	WRITE( message_string, * ) 'nzb_local values are outside the', &
	674	'model domain', &
	675	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
	676	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	677	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	678	ENDIF
	679
[722]	680	IF ( bc_lr == 'cyclic' ) THEN
[1]	681	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
	682	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[254]	683	message_string = 'nzb_local does not fulfill cyclic' // &
	684	' boundary condition in x-direction'
	685	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	686	ENDIF
	687	ENDIF
[722]	688	IF ( bc_ns == 'cyclic' ) THEN
[1]	689	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
	690	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[254]	691	message_string = 'nzb_local does not fulfill cyclic' // &
	692	' boundary condition in y-direction'
	693	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	694	ENDIF
	695	ENDIF
	696
[217]	697	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	698	!
[217]	699	!-- The array nzb_local as defined using the 'cell_edge' convention
	700	!-- describes the actual total size of topography which is defined at the
	701	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	702	!-- on the topography walls in y-direction. However, PALM uses individual
	703	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	704	!-- Therefore, the extent of topography in nzb_local is now reduced by
	705	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	706	!-- to form the basis for nzb_s_inner.
	707	DO j = -gls, ny + gls
	708	DO i = -gls, nx
	709	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	710	ENDDO
[134]	711	ENDDO
[217]	712	!-- apply cyclic boundary conditions in x-direction
	713	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	714	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	715	DO i = -gls, nx + gls
	716	DO j = -gls, ny
	717	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	718	ENDDO
[134]	719	ENDDO
[217]	720	!-- apply cyclic boundary conditions in y-direction
	721	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	722	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	723	ENDIF
[134]	724
[1]	725	!
	726	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	727	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	728	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	729
	730	!
	731	!-- Initialize remaining index arrays:
	732	!-- first pre-initialize them with nzb_s_inner...
	733	nzb_u_inner = nzb_s_inner
	734	nzb_u_outer = nzb_s_inner
	735	nzb_v_inner = nzb_s_inner
	736	nzb_v_outer = nzb_s_inner
	737	nzb_w_outer = nzb_s_inner
	738	nzb_s_outer = nzb_s_inner
	739
	740	!
	741	!-- ...then extend pre-initialized arrays in their according directions
	742	!-- based on nzb_local using nzb_tmp as a temporary global index array
	743
	744	!
	745	!-- nzb_s_outer:
	746	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	747	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	748	DO j = -1, ny + 1
	749	DO i = 0, nx
	750	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
	751	nzb_local(j,i+1) )
	752	ENDDO
	753	ENDDO
	754	DO i = nxl, nxr
	755	DO j = nys, nyn
	756	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	757	nzb_tmp(j+1,i) )
	758	ENDDO
	759	!
	760	!-- non-cyclic boundary conditions (overwritten by call of
	761	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	762	IF ( nys == 0 ) THEN
	763	j = -1
	764	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	765	ENDIF
	766	IF ( nys == ny ) THEN
	767	j = ny + 1
	768	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	769	ENDIF
	770	ENDDO
	771	!
	772	!-- nzb_w_outer:
	773	!-- identical to nzb_s_outer
	774	nzb_w_outer = nzb_s_outer
	775
	776	!
	777	!-- nzb_u_inner:
	778	!-- extend nzb_local rightwards only
[667]	779	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	780	DO j = -1, ny + 1
	781	DO i = 0, nx + 1
	782	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	783	ENDDO
	784	ENDDO
[667]	785	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	786
	787	!
	788	!-- nzb_u_outer:
	789	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	790	DO i = nxl, nxr
	791	DO j = nys, nyn
	792	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	793	nzb_tmp(j+1,i) )
	794	ENDDO
	795	!
	796	!-- non-cyclic boundary conditions (overwritten by call of
	797	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	798	IF ( nys == 0 ) THEN
	799	j = -1
	800	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	801	ENDIF
	802	IF ( nys == ny ) THEN
	803	j = ny + 1
	804	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	805	ENDIF
	806	ENDDO
	807
	808	!
	809	!-- nzb_v_inner:
	810	!-- extend nzb_local northwards only
[667]	811	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	812	DO i = -1, nx + 1
	813	DO j = 0, ny + 1
	814	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	815	ENDDO
	816	ENDDO
[667]	817	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	818
	819	!
	820	!-- nzb_v_outer:
	821	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	822	DO j = nys, nyn
	823	DO i = nxl, nxr
	824	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
	825	nzb_tmp(j,i+1) )
	826	ENDDO
	827	!
	828	!-- non-cyclic boundary conditions (overwritten by call of
	829	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	830	IF ( nxl == 0 ) THEN
	831	i = -1
	832	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	833	ENDIF
	834	IF ( nxr == nx ) THEN
	835	i = nx + 1
	836	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	837	ENDIF
	838	ENDDO
[809]	839	#if ! defined ( __check )
[1]	840	!
	841	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	842	!-- boundary conditions, if applicable.
	843	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	844	!-- they do not require exchange and are not included here.
	845	CALL exchange_horiz_2d_int( nzb_u_inner )
	846	CALL exchange_horiz_2d_int( nzb_u_outer )
	847	CALL exchange_horiz_2d_int( nzb_v_inner )
	848	CALL exchange_horiz_2d_int( nzb_v_outer )
	849	CALL exchange_horiz_2d_int( nzb_w_outer )
	850	CALL exchange_horiz_2d_int( nzb_s_outer )
	851
[49]	852	!
	853	!-- Allocate and set the arrays containing the topography height
	854	IF ( myid == 0 ) THEN
	855
	856	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	857
	858	DO i = 0, nx + 1
	859	DO j = 0, ny + 1
	860	zu_s_inner(i,j) = zu(nzb_local(j,i))
	861	zw_w_inner(i,j) = zw(nzb_local(j,i))
	862	ENDDO
	863	ENDDO
	864
	865	ENDIF
[1221]	866	!
	867	!-- Set flag arrays to be used for masking of grid points
	868	DO i = nxlg, nxrg
	869	DO j = nysg, nyng
	870	DO k = nzb, nzt+1
	871	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0
	872	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0
	873	ENDDO
	874	ENDDO
	875	ENDDO
[807]	876	#endif
[1]	877	ENDIF
	878
[809]	879	#if ! defined ( __check )
[1]	880	!
	881	!-- Preliminary: to be removed after completion of the topography code!
	882	!-- Set the former default k index arrays nzb_2d
	883	nzb_2d = nzb
	884
	885	!
	886	!-- Set the individual index arrays which define the k index from which on
	887	!-- the usual finite difference form (which does not use surface fluxes) is
	888	!-- applied
	889	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	890	nzb_diff_u = nzb_u_inner + 2
	891	nzb_diff_v = nzb_v_inner + 2
	892	nzb_diff_s_inner = nzb_s_inner + 2
	893	nzb_diff_s_outer = nzb_s_outer + 2
	894	ELSE
	895	nzb_diff_u = nzb_u_inner + 1
	896	nzb_diff_v = nzb_v_inner + 1
	897	nzb_diff_s_inner = nzb_s_inner + 1
	898	nzb_diff_s_outer = nzb_s_outer + 1
	899	ENDIF
	900
	901	!
	902	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	903	!-- for limitation of near-wall mixing length l_wall further below
	904	corner_nl = 0
	905	corner_nr = 0
	906	corner_sl = 0
	907	corner_sr = 0
	908	wall_l = 0
	909	wall_n = 0
	910	wall_r = 0
	911	wall_s = 0
	912
	913	DO i = nxl, nxr
	914	DO j = nys, nyn
	915	!
	916	!-- u-component
	917	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
	918	wall_u(j,i) = 1.0 ! north wall (location of adjacent fluid)
	919	fym(j,i) = 0.0
	920	fyp(j,i) = 1.0
	921	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
	922	wall_u(j,i) = 1.0 ! south wall (location of adjacent fluid)
	923	fym(j,i) = 1.0
	924	fyp(j,i) = 0.0
	925	ENDIF
	926	!
	927	!-- v-component
	928	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
	929	wall_v(j,i) = 1.0 ! rigth wall (location of adjacent fluid)
	930	fxm(j,i) = 0.0
	931	fxp(j,i) = 1.0
	932	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
	933	wall_v(j,i) = 1.0 ! left wall (location of adjacent fluid)
	934	fxm(j,i) = 1.0
	935	fxp(j,i) = 0.0
	936	ENDIF
	937	!
	938	!-- w-component, also used for scalars, separate arrays for shear
	939	!-- production of tke
	940	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
	941	wall_e_y(j,i) = 1.0 ! north wall (location of adjacent fluid)
	942	wall_w_y(j,i) = 1.0
	943	fwym(j,i) = 0.0
	944	fwyp(j,i) = 1.0
	945	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
	946	wall_e_y(j,i) = -1.0 ! south wall (location of adjacent fluid)
	947	wall_w_y(j,i) = 1.0
	948	fwym(j,i) = 1.0
	949	fwyp(j,i) = 0.0
	950	ENDIF
	951	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
	952	wall_e_x(j,i) = 1.0 ! right wall (location of adjacent fluid)
	953	wall_w_x(j,i) = 1.0
	954	fwxm(j,i) = 0.0
	955	fwxp(j,i) = 1.0
	956	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
	957	wall_e_x(j,i) = -1.0 ! left wall (location of adjacent fluid)
	958	wall_w_x(j,i) = 1.0
	959	fwxm(j,i) = 1.0
	960	fwxp(j,i) = 0.0
	961	ENDIF
	962	!
	963	!-- Wall and corner locations inside buildings for limitation of
	964	!-- near-wall mixing length l_wall
	965	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	966
	967	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	968
	969	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	970	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	971	nzb_s_inner(j,i-1) ) + 1
	972	ENDIF
	973
	974	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	975	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	976	nzb_s_inner(j,i+1) ) + 1
	977	ENDIF
	978
	979	ENDIF
	980
	981	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	982
	983	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	984	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	985	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	986	nzb_s_inner(j,i-1) ) + 1
	987	ENDIF
	988
	989	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	990	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	991	nzb_s_inner(j,i+1) ) + 1
	992	ENDIF
	993
	994	ENDIF
	995
	996	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	997	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	998	ENDIF
	999
	1000	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1001	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1002	ENDIF
	1003
	1004	ENDDO
	1005	ENDDO
	1006
	1007	!
[114]	1008	!-- Calculate wall flag arrays for the multigrid method
	1009	IF ( psolver == 'multigrid' ) THEN
	1010	!
	1011	!-- Gridpoint increment of the current level
	1012	inc = 1
	1013
	1014	DO l = maximum_grid_level, 1 , -1
	1015
	1016	nxl_l = nxl_mg(l)
	1017	nxr_l = nxr_mg(l)
	1018	nys_l = nys_mg(l)
	1019	nyn_l = nyn_mg(l)
	1020	nzt_l = nzt_mg(l)
	1021
	1022	!
	1023	!-- Assign the flag level to be calculated
	1024	SELECT CASE ( l )
	1025	CASE ( 1 )
	1026	flags => wall_flags_1
	1027	CASE ( 2 )
	1028	flags => wall_flags_2
	1029	CASE ( 3 )
	1030	flags => wall_flags_3
	1031	CASE ( 4 )
	1032	flags => wall_flags_4
	1033	CASE ( 5 )
	1034	flags => wall_flags_5
	1035	CASE ( 6 )
	1036	flags => wall_flags_6
	1037	CASE ( 7 )
	1038	flags => wall_flags_7
	1039	CASE ( 8 )
	1040	flags => wall_flags_8
	1041	CASE ( 9 )
	1042	flags => wall_flags_9
	1043	CASE ( 10 )
	1044	flags => wall_flags_10
	1045	END SELECT
	1046
	1047	!
	1048	!-- Depending on the grid level, set the respective bits in case of
	1049	!-- neighbouring walls
	1050	!-- Bit 0: wall to the bottom
	1051	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1052	!-- Bit 2: wall to the south
	1053	!-- Bit 3: wall to the north
	1054	!-- Bit 4: wall to the left
	1055	!-- Bit 5: wall to the right
[116]	1056	!-- Bit 6: inside building
[114]	1057
	1058	flags = 0
	1059
[927]	1060	!
	1061	!-- In case of masking method, flags are not set and multigrid method
	1062	!-- works like FFT-solver
	1063	IF ( .NOT. masking_method ) THEN
	1064
	1065	DO i = nxl_l-1, nxr_l+1
	1066	DO j = nys_l-1, nyn_l+1
	1067	DO k = nzb, nzt_l+1
[114]	1068
	1069	!
[927]	1070	!-- Inside/outside building (inside building does not need
	1071	!-- further tests for walls)
	1072	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1073
[927]	1074	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1075
[927]	1076	ELSE
[114]	1077	!
[927]	1078	!-- Bottom wall
	1079	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1080	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1081	ENDIF
[114]	1082	!
[927]	1083	!-- South wall
	1084	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1085	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1086	ENDIF
[114]	1087	!
[927]	1088	!-- North wall
	1089	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1090	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1091	ENDIF
[114]	1092	!
[927]	1093	!-- Left wall
	1094	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1095	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1096	ENDIF
[114]	1097	!
[927]	1098	!-- Right wall
	1099	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1100	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1101	ENDIF
	1102
[114]	1103	ENDIF
	1104
[927]	1105	ENDDO
[114]	1106	ENDDO
	1107	ENDDO
	1108
[927]	1109	ENDIF
	1110
[114]	1111	!
	1112	!-- Test output of flag arrays
[145]	1113	! i = nxl_l
	1114	! WRITE (9,*) ' '
	1115	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1116	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1117	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1118	! DO k = nzt_l+1, nzb, -1
	1119	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1120	! ENDDO
[114]	1121
	1122	inc = inc * 2
	1123
	1124	ENDDO
	1125
	1126	ENDIF
[861]	1127	!
	1128	!-- Allocate flags needed for masking walls.
[1221]	1129	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr), &
	1130	wall_flags_00(nzb:nzt,nys:nyn,nxl:nxr) )
	1131	wall_flags_0 = 0
	1132	wall_flags_00 = 0
[114]	1133
[861]	1134	IF ( scalar_advec == 'ws-scheme' ) THEN
[114]	1135	!
[861]	1136	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1137	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1138	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1139	!-- grid points.
	1140	DO i = nxl, nxr
	1141	DO j = nys, nyn
	1142	DO k = nzb_s_inner(j,i)+1, nzt
	1143	!
	1144	!-- scalar - x-direction
	1145	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1146	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1147	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1148	.AND. i == nxr ) ) THEN
[861]	1149	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1150	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1151	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1152	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1153	) THEN
[861]	1154	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1155	ELSE
	1156	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1157	ENDIF
	1158	!
	1159	!-- scalar - y-direction
	1160	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1161	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1162	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1163	.AND. j == nyn ) ) THEN
[861]	1164	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1165	!-- WS3
	1166	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1167	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1168	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1169	) THEN
[861]	1170	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1171	!-- WS5
	1172	ELSE
	1173	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1174	ENDIF
	1175	!
	1176	!-- scalar - z-direction
	1177	!-- WS1 (6), WS3 (7), WS5 (8)
	1178	flag_set = .FALSE.
	1179	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1180	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1181	flag_set = .TRUE.
	1182	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1183	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1184	flag_set = .TRUE.
	1185	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1186	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1187	ENDIF
	1188	ENDDO
	1189	ENDDO
	1190	ENDDO
	1191	ENDIF
	1192
	1193	IF ( momentum_advec == 'ws-scheme' ) THEN
	1194	!
	1195	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1196	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1197	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1198	!-- grid points.
	1199	DO i = nxl, nxr
	1200	DO j = nys, nyn
	1201	DO k = nzb_u_inner(j,i)+1, nzt
	1202	!
	1203	!-- u component - x-direction
	1204	!-- WS1 (9), WS3 (10), WS5 (11)
	1205	IF ( k <= nzb_u_inner(j,i+1) &
[978]	1206	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1207	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1208	) THEN
[861]	1209	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1210	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1211	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1212	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1213	) THEN
[861]	1214	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
	1215	ELSE
	1216	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
	1217	ENDIF
[978]	1218
[861]	1219	!
	1220	!-- u component - y-direction
	1221	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1222	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1223	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1224	.AND. j == nyn ) ) THEN
[861]	1225	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1226	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1227	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1228	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1229	) THEN
[861]	1230	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
	1231	ELSE
	1232	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
	1233	ENDIF
	1234	!
	1235	!-- u component - z-direction
	1236	!-- WS1 (15), WS3 (16), WS5 (17)
	1237	flag_set = .FALSE.
	1238	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1239	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1240	flag_set = .TRUE.
	1241	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1242	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1243	flag_set = .TRUE.
	1244	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1245	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1246	ENDIF
	1247
	1248	ENDDO
	1249	ENDDO
	1250	ENDDO
	1251
	1252	DO i = nxl, nxr
	1253	DO j = nys, nyn
	1254	DO k = nzb_v_inner(j,i)+1, nzt
	1255	!
	1256	!-- v component - x-direction
	1257	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1258	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1259	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1260	.AND. i == nxr ) ) THEN
[861]	1261	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1262	!-- WS3
	1263	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1264	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1265	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1266	) THEN
[861]	1267	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
	1268	ELSE
	1269	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
	1270	ENDIF
	1271	!
	1272	!-- v component - y-direction
	1273	!-- WS1 (21), WS3 (22), WS5 (23)
	1274	IF ( k <= nzb_v_inner(j+1,i) &
[978]	1275	.OR. ( ( inflow_s .OR. outflow_s ) .AND. i == nysv ) &
	1276	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1277	) THEN
[861]	1278	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1279	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1280	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1281	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1282	) THEN
[861]	1283	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
	1284	ELSE
	1285	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
	1286	ENDIF
	1287	!
	1288	!-- v component - z-direction
	1289	!-- WS1 (24), WS3 (25), WS5 (26)
	1290	flag_set = .FALSE.
	1291	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1292	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1293	flag_set = .TRUE.
	1294	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1295	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1296	flag_set = .TRUE.
	1297	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1298	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1299	ENDIF
	1300
	1301	ENDDO
	1302	ENDDO
	1303	ENDDO
	1304	DO i = nxl, nxr
	1305	DO j = nys, nyn
[1015]	1306	DO k = nzb_w_inner(j,i), nzt
[861]	1307	!
	1308	!-- w component - x-direction
	1309	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1310	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1311	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1312	.AND. i == nxr ) ) THEN
[861]	1313	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1314	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1315	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1316	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1317	) THEN
[861]	1318	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
	1319	ELSE
	1320	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
	1321	ENDIF
	1322	!
	1323	!-- w component - y-direction
	1324	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1325	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1326	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1327	.AND. j == nyn ) ) THEN
[861]	1328	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1329	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1330	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1331	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1332	) THEN
[861]	1333	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
	1334	ELSE
[1221]	1335	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[861]	1336	ENDIF
	1337	!
	1338	!-- w component - z-direction
	1339	!-- WS1 (33), WS3 (34), WS5 (35)
	1340	flag_set = .FALSE.
	1341	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1342	.OR. k == nzt ) THEN
	1343	!
	1344	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1345	!-- set, although this is not a prognostic level. However,
	1346	!-- contrary to the advection of u,v and s this is necessary
	1347	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1348	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1349	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1350	flag_set = .TRUE.
	1351	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1352	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1353	flag_set = .TRUE.
	1354	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1355	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1356	ENDIF
	1357
	1358	ENDDO
	1359	ENDDO
	1360	ENDDO
	1361
	1362	ENDIF
	1363
	1364	!
[1]	1365	!-- In case of topography: limit near-wall mixing length l_wall further:
	1366	!-- Go through all points of the subdomain one by one and look for the closest
	1367	!-- surface
	1368	IF ( TRIM(topography) /= 'flat' ) THEN
	1369	DO i = nxl, nxr
	1370	DO j = nys, nyn
	1371
	1372	nzb_si = nzb_s_inner(j,i)
	1373	vi = vertical_influence(nzb_si)
	1374
	1375	IF ( wall_n(j,i) > 0 ) THEN
	1376	!
	1377	!-- North wall (y distance)
	1378	DO k = wall_n(j,i), nzb_si
	1379	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5 * dy )
	1380	ENDDO
	1381	!
	1382	!-- Above North wall (yz distance)
	1383	DO k = nzb_si + 1, nzb_si + vi
	1384	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1385	SQRT( 0.25 * dy**2 + &
	1386	( zu(k) - zw(nzb_si) )**2 ) )
	1387	ENDDO
	1388	!
	1389	!-- Northleft corner (xy distance)
	1390	IF ( corner_nl(j,i) > 0 ) THEN
	1391	DO k = corner_nl(j,i), nzb_si
	1392	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1393	0.5 * SQRT( dx2 + dy2 ) )
	1394	ENDDO
	1395	!
	1396	!-- Above Northleft corner (xyz distance)
	1397	DO k = nzb_si + 1, nzb_si + vi
	1398	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1399	SQRT( 0.25 * (dx2 + dy2) + &
	1400	( zu(k) - zw(nzb_si) )**2 ) )
	1401	ENDDO
	1402	ENDIF
	1403	!
	1404	!-- Northright corner (xy distance)
	1405	IF ( corner_nr(j,i) > 0 ) THEN
	1406	DO k = corner_nr(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 northright 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	ENDIF
	1419
	1420	IF ( wall_s(j,i) > 0 ) THEN
	1421	!
	1422	!-- South wall (y distance)
	1423	DO k = wall_s(j,i), nzb_si
	1424	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5 * dy )
	1425	ENDDO
	1426	!
	1427	!-- Above south wall (yz distance)
	1428	DO k = nzb_si + 1, &
	1429	nzb_si + vi
	1430	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1431	SQRT( 0.25 * dy**2 + &
	1432	( zu(k) - zw(nzb_si) )**2 ) )
	1433	ENDDO
	1434	!
	1435	!-- Southleft corner (xy distance)
	1436	IF ( corner_sl(j,i) > 0 ) THEN
	1437	DO k = corner_sl(j,i), nzb_si
	1438	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1439	0.5 * SQRT( dx2 + dy2 ) )
	1440	ENDDO
	1441	!
	1442	!-- Above southleft corner (xyz distance)
	1443	DO k = nzb_si + 1, nzb_si + vi
	1444	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1445	SQRT( 0.25 * (dx2 + dy2) + &
	1446	( zu(k) - zw(nzb_si) )**2 ) )
	1447	ENDDO
	1448	ENDIF
	1449	!
	1450	!-- Southright corner (xy distance)
	1451	IF ( corner_sr(j,i) > 0 ) THEN
	1452	DO k = corner_sr(j,i), nzb_si
	1453	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1454	0.5 * SQRT( dx2 + dy2 ) )
	1455	ENDDO
	1456	!
	1457	!-- Above southright corner (xyz distance)
	1458	DO k = nzb_si + 1, nzb_si + vi
	1459	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1460	SQRT( 0.25 * (dx2 + dy2) + &
	1461	( zu(k) - zw(nzb_si) )**2 ) )
	1462	ENDDO
	1463	ENDIF
	1464
	1465	ENDIF
	1466
	1467	IF ( wall_l(j,i) > 0 ) THEN
	1468	!
	1469	!-- Left wall (x distance)
	1470	DO k = wall_l(j,i), nzb_si
	1471	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5 * dx )
	1472	ENDDO
	1473	!
	1474	!-- Above left wall (xz distance)
	1475	DO k = nzb_si + 1, nzb_si + vi
	1476	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1477	SQRT( 0.25 * dx**2 + &
	1478	( zu(k) - zw(nzb_si) )**2 ) )
	1479	ENDDO
	1480	ENDIF
	1481
	1482	IF ( wall_r(j,i) > 0 ) THEN
	1483	!
	1484	!-- Right wall (x distance)
	1485	DO k = wall_r(j,i), nzb_si
	1486	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5 * dx )
	1487	ENDDO
	1488	!
	1489	!-- Above right wall (xz distance)
	1490	DO k = nzb_si + 1, nzb_si + vi
	1491	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1492	SQRT( 0.25 * dx**2 + &
	1493	( zu(k) - zw(nzb_si) )**2 ) )
	1494	ENDDO
	1495
	1496	ENDIF
	1497
	1498	ENDDO
	1499	ENDDO
	1500
	1501	ENDIF
	1502
	1503	!
	1504	!-- Multiplication with wall_adjustment_factor
	1505	l_wall = wall_adjustment_factor * l_wall
	1506
	1507	!
[709]	1508	!-- Set lateral boundary conditions for l_wall
[667]	1509	CALL exchange_horiz( l_wall, nbgp )
	1510
[1]	1511	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1512	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1513
[807]	1514	#endif
[1]	1515
	1516	END SUBROUTINE init_grid

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