Home

Context Navigation

source: palm/trunk/SOURCE/init_grid.f90 @ 1039

Last change on this file since 1039 was 1037, checked in by raasch, 12 years ago
last commit documented
Property svn:keywords set to `Id`
File size: 56.1 KB

Rev	Line
[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	!
[1017]	23	!
[863]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1037 2012-10-22 14:10:22Z raasch $
	27	!
[1037]	28	! 1036 2012-10-22 13:43:42Z raasch
	29	! code put under GPL (PALM 3.9)
	30	!
[1017]	31	! 1015 2012-09-27 09:23:24Z raasch
	32	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	33	! nzb_w_inner+1
	34	!
[997]	35	! 996 2012-09-07 10:41:47Z raasch
	36	! little reformatting
	37	!
[979]	38	! 978 2012-08-09 08:28:32Z fricke
	39	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	40	! Bugfix: Set wall_flags_0 for inflow boundary
	41	!
[928]	42	! 927 2012-06-06 19:15:04Z raasch
	43	! Wall flags are not set for multigrid method in case of masking method
	44	!
[865]	45	! 864 2012-03-27 15:10:33Z gryschka
[927]	46	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	47	! were not correctly defined for k=1.
[865]	48	!
[863]	49	! 861 2012-03-26 14:18:34Z suehring
[861]	50	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	51	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	52	! model domain.!
[861]	53	! Initialization of nzb_s_inner and nzb_w_inner.
	54	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	55	! while setting wall_flags_0
	56	!
[844]	57	! 843 2012-02-29 15:16:21Z gryschka
	58	! In case of ocean and dirichlet bc for u and v at the bottom
	59	! the first u-level ist defined at same height as the first w-level
	60	!
[819]	61	! 818 2012-02-08 16:11:23Z maronga
	62	! Bugfix: topo_height is only required if topography is used. It is thus now
	63	! allocated in the topography branch
	64	!
[810]	65	! 809 2012-01-30 13:32:58Z maronga
	66	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	67	!
[808]	68	! 807 2012-01-25 11:53:51Z maronga
	69	! New cpp directive "__check" implemented which is used by check_namelist_files
	70	!
[760]	71	! 759 2011-09-15 13:58:31Z raasch
	72	! Splitting of parallel I/O in blocks of PEs
	73	!
[723]	74	! 722 2011-04-11 06:21:09Z raasch
	75	! Bugfix: bc_lr/ns_cyc replaced by bc_lr/ns, because variables are not yet set
	76	! here
	77	!
[710]	78	! 709 2011-03-30 09:31:40Z raasch
	79	! formatting adjustments
	80	!
[708]	81	! 707 2011-03-29 11:39:40Z raasch
	82	! bc_lr/ns replaced by bc_lr/ns_cyc
	83	!
[668]	84	! 667 2010-12-23 12:06:00Z suehring/gryschka
[667]	85	! Definition of new array bounds nxlg, nxrg, nysg, nyng on each PE.
	86	! Furthermore the allocation of arrays and steering of loops is done with these
	87	! parameters. Call of exchange_horiz are modified.
	88	! In case of dirichlet bounday condition at the bottom zu(0)=0.0
	89	! dzu_mg has to be set explicitly for a equally spaced grid near bottom.
	90	! ddzu_pres added to use a equally spaced grid near bottom.
[139]	91	!
[556]	92	! 555 2010-09-07 07:32:53Z raasch
[818]	93	! Bugfix: default setting of nzb_local for flat topography
[556]	94	!
[392]	95	! 274 2009-03-26 15:11:21Z heinze
	96	! Output of messages replaced by message handling routine.
	97	! new topography case 'single_street_canyon'
	98	!
[226]	99	! 217 2008-12-09 18:00:48Z letzel
	100	! +topography_grid_convention
	101	!
[139]	102	! 134 2007-11-21 07:28:38Z letzel
[134]	103	! Redefine initial nzb_local as the actual total size of topography (later the
	104	! extent of topography in nzb_local is reduced by 1dx at the E topography walls
	105	! and by 1dy at the N topography walls to form the basis for nzb_s_inner);
	106	! for consistency redefine 'single_building' case.
[114]	107	! Calculation of wall flag arrays
[1]	108	!
[98]	109	! 94 2007-06-01 15:25:22Z raasch
	110	! Grid definition for ocean version
	111	!
[77]	112	! 75 2007-03-22 09:54:05Z raasch
	113	! storage of topography height arrays zu_s_inner and zw_s_inner,
	114	! 2nd+3rd argument removed from exchange horiz
	115	!
[39]	116	! 19 2007-02-23 04:53:48Z raasch
	117	! Setting of nzt_diff
	118	!
[3]	119	! RCS Log replace by Id keyword, revision history cleaned up
	120	!
[1]	121	! Revision 1.17 2006/08/22 14:00:05 raasch
	122	! +dz_max to limit vertical stretching,
	123	! bugfix in index array initialization for line- or point-like topography
	124	! structures
	125	!
	126	! Revision 1.1 1997/08/11 06:17:45 raasch
	127	! Initial revision (Testversion)
	128	!
	129	!
	130	! Description:
	131	! ------------
	132	! Creating grid depending constants
	133	!------------------------------------------------------------------------------!
	134
	135	USE arrays_3d
	136	USE control_parameters
	137	USE grid_variables
	138	USE indices
	139	USE pegrid
	140
	141	IMPLICIT NONE
	142
[240]	143	INTEGER :: bh, blx, bly, bxl, bxr, byn, bys, ch, cwx, cwy, cxl, cxr, cyn, &
[759]	144	cys, gls, i, ii, inc, i_center, j, j_center, k, l, nxl_l, &
	145	nxr_l, nyn_l, nys_l, nzb_si, nzt_l, vi
[1]	146
	147	INTEGER, DIMENSION(:), ALLOCATABLE :: vertical_influence
	148
	149	INTEGER, DIMENSION(:,:), ALLOCATABLE :: corner_nl, corner_nr, corner_sl, &
	150	corner_sr, wall_l, wall_n, wall_r,&
	151	wall_s, nzb_local, nzb_tmp
	152
[861]	153	LOGICAL :: flag_set = .FALSE.
	154
[1]	155	REAL :: dx_l, dy_l, dz_stretched
	156
[818]	157	REAL, DIMENSION(:,:), ALLOCATABLE :: topo_height
[1]	158
	159	REAL, DIMENSION(:,:,:), ALLOCATABLE :: distance
[667]	160
[1]	161	!
[709]	162	!-- Calculation of horizontal array bounds including ghost layers
[667]	163	nxlg = nxl - nbgp
	164	nxrg = nxr + nbgp
	165	nysg = nys - nbgp
	166	nyng = nyn + nbgp
[709]	167
[667]	168	!
[1]	169	!-- Allocate grid arrays
	170	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	171	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	172
	173	!
	174	!-- Compute height of u-levels from constant grid length and dz stretch factors
	175	IF ( dz == -1.0 ) THEN
[254]	176	message_string = 'missing dz'
	177	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1]	178	ELSEIF ( dz <= 0.0 ) THEN
[254]	179	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	180	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	181	ENDIF
[94]	182
[1]	183	!
[94]	184	!-- Define the vertical grid levels
	185	IF ( .NOT. ocean ) THEN
	186	!
	187	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	188	!-- The second u-level (k=1) corresponds to the top of the
[94]	189	!-- Prandtl-layer.
[667]	190
	191	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
	192	zu(0) = 0.0
	193	! zu(0) = - dz * 0.5
	194	ELSE
	195	zu(0) = - dz * 0.5
	196	ENDIF
[94]	197	zu(1) = dz * 0.5
[1]	198
[94]	199	dz_stretch_level_index = nzt+1
	200	dz_stretched = dz
	201	DO k = 2, nzt+1
	202	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	203	dz_stretched = dz_stretched * dz_stretch_factor
	204	dz_stretched = MIN( dz_stretched, dz_max )
	205	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	206	ENDIF
	207	zu(k) = zu(k-1) + dz_stretched
	208	ENDDO
[1]	209
	210	!
[94]	211	!-- Compute the w-levels. They are always staggered half-way between the
[843]	212	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	213	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	214	!-- The top w-level is extrapolated linearly.
[94]	215	zw(0) = 0.0
	216	DO k = 1, nzt
	217	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	218	ENDDO
	219	zw(nzt+1) = zw(nzt) + 2.0 * ( zu(nzt+1) - zw(nzt) )
[1]	220
[94]	221	ELSE
[1]	222	!
[843]	223	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	224	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	225	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	226	!-- w-level are defined at same height, but staggered from the second level.
	227	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[94]	228	zu(nzt+1) = dz * 0.5
	229	zu(nzt) = - dz * 0.5
	230
	231	dz_stretch_level_index = 0
	232	dz_stretched = dz
	233	DO k = nzt-1, 0, -1
	234	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
	235	dz_stretched < dz_max ) THEN
	236	dz_stretched = dz_stretched * dz_stretch_factor
	237	dz_stretched = MIN( dz_stretched, dz_max )
	238	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	239	ENDIF
	240	zu(k) = zu(k+1) - dz_stretched
	241	ENDDO
	242
	243	!
	244	!-- Compute the w-levels. They are always staggered half-way between the
[843]	245	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	246	!-- at the ground. In this case the first u- and w-level are defined at
	247	!-- same height. The top w-level (nzt+1) is not used but set for
	248	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	249	zw(nzt+1) = dz
	250	zw(nzt) = 0.0
	251	DO k = 0, nzt
	252	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	253	ENDDO
	254
[843]	255	!
	256	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	257	!-- at same height.
	258	IF ( ibc_uv_b == 0 ) THEN
	259	zu(0) = zw(0)
	260	ENDIF
	261
[94]	262	ENDIF
	263
	264	!
[1]	265	!-- Compute grid lengths.
	266	DO k = 1, nzt+1
	267	dzu(k) = zu(k) - zu(k-1)
	268	ddzu(k) = 1.0 / dzu(k)
	269	dzw(k) = zw(k) - zw(k-1)
	270	ddzw(k) = 1.0 / dzw(k)
	271	ENDDO
	272
	273	DO k = 1, nzt
	274	dd2zu(k) = 1.0 / ( dzu(k) + dzu(k+1) )
	275	ENDDO
[667]	276
	277	!
[709]	278	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	279	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	280	!-- is only dz/2, but should be dz. Therefore, an additional array
	281	!-- containing with appropriate grid information is created for these
	282	!-- solvers.
	283	IF ( psolver /= 'multigrid' ) THEN
[667]	284	ALLOCATE( ddzu_pres(1:nzt+1) )
	285	ddzu_pres = ddzu
[864]	286	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	287	ENDIF
[1]	288
	289	!
	290	!-- In case of multigrid method, compute grid lengths and grid factors for the
	291	!-- grid levels
	292	IF ( psolver == 'multigrid' ) THEN
	293
	294	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	295	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	296	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	297	f1_mg(nzb+1:nzt,maximum_grid_level), &
	298	f2_mg(nzb+1:nzt,maximum_grid_level), &
	299	f3_mg(nzb+1:nzt,maximum_grid_level) )
	300
	301	dzu_mg(:,maximum_grid_level) = dzu
[667]	302	!
[864]	303	!-- Next line to ensure an equally spaced grid.
	304	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	305
[1]	306	dzw_mg(:,maximum_grid_level) = dzw
	307	nzt_l = nzt
	308	DO l = maximum_grid_level-1, 1, -1
	309	dzu_mg(nzb+1,l) = 2.0 * dzu_mg(nzb+1,l+1)
	310	dzw_mg(nzb+1,l) = 2.0 * dzw_mg(nzb+1,l+1)
	311	nzt_l = nzt_l / 2
	312	DO k = 2, nzt_l+1
	313	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	314	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	315	ENDDO
	316	ENDDO
	317
	318	nzt_l = nzt
	319	dx_l = dx
	320	dy_l = dy
	321	DO l = maximum_grid_level, 1, -1
	322	ddx2_mg(l) = 1.0 / dx_l**2
	323	ddy2_mg(l) = 1.0 / dy_l**2
	324	DO k = nzb+1, nzt_l
	325	f2_mg(k,l) = 1.0 / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	326	f3_mg(k,l) = 1.0 / ( dzu_mg(k,l) * dzw_mg(k,l) )
	327	f1_mg(k,l) = 2.0 * ( ddx2_mg(l) + ddy2_mg(l) ) + &
	328	f2_mg(k,l) + f3_mg(k,l)
	329	ENDDO
	330	nzt_l = nzt_l / 2
	331	dx_l = dx_l * 2.0
	332	dy_l = dy_l * 2.0
	333	ENDDO
	334
	335	ENDIF
	336
	337	!
	338	!-- Compute the reciprocal values of the horizontal grid lengths.
	339	ddx = 1.0 / dx
	340	ddy = 1.0 / dy
	341	dx2 = dx * dx
	342	dy2 = dy * dy
	343	ddx2 = 1.0 / dx2
	344	ddy2 = 1.0 / dy2
	345
	346	!
	347	!-- Compute the grid-dependent mixing length.
	348	DO k = 1, nzt
	349	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333
	350	ENDDO
	351
	352	!
	353	!-- Allocate outer and inner index arrays for topography and set
[114]	354	!-- defaults.
	355	!-- nzb_local has to contain additional layers of ghost points for calculating
	356	!-- the flag arrays needed for the multigrid method
	357	gls = 2**( maximum_grid_level )
[861]	358	IF ( gls < nbgp ) gls = nbgp
[667]	359
[114]	360	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	361	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	362	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	363	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	364	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	365	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	366	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	367	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	368	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	369	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	370	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	371	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	372	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	373	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	374	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	375	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	376	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	377	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	378	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	379	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	380	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	381	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	382	nzb_2d(nysg:nyng,nxlg:nxrg), &
	383	wall_e_x(nysg:nyng,nxlg:nxrg), &
	384	wall_e_y(nysg:nyng,nxlg:nxrg), &
	385	wall_u(nysg:nyng,nxlg:nxrg), &
	386	wall_v(nysg:nyng,nxlg:nxrg), &
	387	wall_w_x(nysg:nyng,nxlg:nxrg), &
	388	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	389
	390
[667]	391
	392	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	393
[818]	394
[1]	395	nzb_s_inner = nzb; nzb_s_outer = nzb
	396	nzb_u_inner = nzb; nzb_u_outer = nzb
	397	nzb_v_inner = nzb; nzb_v_outer = nzb
	398	nzb_w_inner = nzb; nzb_w_outer = nzb
	399
	400	!
[19]	401	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	402	!-- form (which does not use surface fluxes) is applied
	403	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	404	nzb_diff = nzb + 2
	405	ELSE
	406	nzb_diff = nzb + 1
	407	ENDIF
[19]	408	IF ( use_top_fluxes ) THEN
	409	nzt_diff = nzt - 1
	410	ELSE
	411	nzt_diff = nzt
	412	ENDIF
[1]	413
	414	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	415	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	416
	417	wall_e_x = 0.0; wall_e_y = 0.0; wall_u = 0.0; wall_v = 0.0
	418	wall_w_x = 0.0; wall_w_y = 0.0
	419	fwxp = 1.0; fwxm = 1.0; fwyp = 1.0; fwym = 1.0
	420	fxp = 1.0; fxm = 1.0; fyp = 1.0; fym = 1.0
	421
	422	!
	423	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	424	!-- for the moment,
	425	!-- multiplication with wall_adjustment_factor near the end of this routine
	426	l_wall(nzb,:,:) = l_grid(1)
	427	DO k = nzb+1, nzt
	428	l_wall(k,:,:) = l_grid(k)
	429	ENDDO
	430	l_wall(nzt+1,:,:) = l_grid(nzt)
	431
	432	ALLOCATE ( vertical_influence(nzb:nzt) )
	433	DO k = 1, nzt
	434	vertical_influence(k) = MIN ( INT( l_grid(k) / &
	435	( wall_adjustment_factor * dzw(k) ) + 0.5 ), nzt - k )
	436	ENDDO
	437
	438	DO k = 1, MAXVAL( nzb_s_inner )
	439	IF ( l_grid(k) > 1.5 * dx * wall_adjustment_factor .OR. &
	440	l_grid(k) > 1.5 * dy * wall_adjustment_factor ) THEN
[254]	441	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	442	'threshold given by only local', &
	443	' &horizontal reduction of near_wall ', &
	444	'mixing length l_wall', &
	445	' &starting from height level k = ', k, '.'
	446	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	447	EXIT
	448	ENDIF
	449	ENDDO
	450	vertical_influence(0) = vertical_influence(1)
	451
[667]	452	DO i = nxlg, nxrg
	453	DO j = nysg, nyng
[1]	454	DO k = nzb_s_inner(j,i) + 1, &
	455	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	456	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	457	ENDDO
	458	ENDDO
	459	ENDDO
	460
	461	!
	462	!-- Set outer and inner index arrays for non-flat topography.
	463	!-- Here consistency checks concerning domain size and periodicity are
	464	!-- necessary.
	465	!-- Within this SELECT CASE structure only nzb_local is initialized
	466	!-- individually depending on the chosen topography type, all other index
	467	!-- arrays are initialized further below.
	468	SELECT CASE ( TRIM( topography ) )
	469
	470	CASE ( 'flat' )
	471	!
[555]	472	!-- nzb_local is required for the multigrid solver
	473	nzb_local = 0
[1]	474
	475	CASE ( 'single_building' )
	476	!
	477	!-- Single rectangular building, by default centered in the middle of the
	478	!-- total domain
	479	blx = NINT( building_length_x / dx )
	480	bly = NINT( building_length_y / dy )
	481	bh = NINT( building_height / dz )
	482
	483	IF ( building_wall_left == 9999999.9 ) THEN
	484	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	485	ENDIF
	486	bxl = NINT( building_wall_left / dx )
	487	bxr = bxl + blx
	488
	489	IF ( building_wall_south == 9999999.9 ) THEN
	490	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	491	ENDIF
	492	bys = NINT( building_wall_south / dy )
	493	byn = bys + bly
	494
	495	!
	496	!-- Building size has to meet some requirements
	497	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	498	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	499	WRITE( message_string, * ) 'inconsistent building parameters:', &
	500	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	501	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	502	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	503	ENDIF
	504
	505	!
[217]	506	!-- Define the building.
[1]	507	nzb_local = 0
[134]	508	nzb_local(bys:byn,bxl:bxr) = bh
[1]	509
[240]	510	CASE ( 'single_street_canyon' )
	511	!
	512	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	513	!-- The canyon is centered in the other direction by default.
	514	IF ( canyon_width_x /= 9999999.9 ) THEN
	515	!
	516	!-- Street canyon in y direction
	517	cwx = NINT( canyon_width_x / dx )
	518	IF ( canyon_wall_left == 9999999.9 ) THEN
	519	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	520	ENDIF
	521	cxl = NINT( canyon_wall_left / dx )
	522	cxr = cxl + cwx
	523
	524	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	525	!
	526	!-- Street canyon in x direction
	527	cwy = NINT( canyon_width_y / dy )
	528	IF ( canyon_wall_south == 9999999.9 ) THEN
	529	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	530	ENDIF
	531	cys = NINT( canyon_wall_south / dy )
	532	cyn = cys + cwy
	533
	534	ELSE
[254]	535
	536	message_string = 'no street canyon width given'
	537	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	538
[240]	539	ENDIF
	540
	541	ch = NINT( canyon_height / dz )
	542	dp_level_ind_b = ch
	543	!
	544	!-- Street canyon size has to meet some requirements
	545	IF ( canyon_width_x /= 9999999.9 ) THEN
	546	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
	547	( ch < 3 ) ) THEN
[254]	548	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	549	'&cxl=', cxl, 'cxr=', cxr, &
	550	'cwx=', cwx, &
[254]	551	'ch=', ch, 'nx=', nx, 'ny=', ny
	552	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	553	ENDIF
	554	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	555	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
	556	( ch < 3 ) ) THEN
[254]	557	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	558	'&cys=', cys, 'cyn=', cyn, &
	559	'cwy=', cwy, &
[254]	560	'ch=', ch, 'nx=', nx, 'ny=', ny
	561	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	562	ENDIF
	563	ENDIF
[274]	564	IF ( canyon_width_x /= 9999999.9 .AND. canyon_width_y /= 9999999.9 ) &
[240]	565	THEN
[274]	566	message_string = 'inconsistent canyon parameters:' // &
[254]	567	'&street canyon can only be oriented' // &
	568	'&either in x- or in y-direction'
	569	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	570	ENDIF
	571
	572	nzb_local = ch
	573	IF ( canyon_width_x /= 9999999.9 ) THEN
	574	nzb_local(:,cxl+1:cxr-1) = 0
	575	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	576	nzb_local(cys+1:cyn-1,:) = 0
	577	ENDIF
	578
[1]	579	CASE ( 'read_from_file' )
[759]	580
[818]	581	ALLOCATE ( topo_height(0:ny,0:nx) )
	582
[759]	583	DO ii = 0, io_blocks-1
	584	IF ( ii == io_group ) THEN
	585
[1]	586	!
[759]	587	!-- Arbitrary irregular topography data in PALM format (exactly
	588	!-- matching the grid size and total domain size)
	589	OPEN( 90, FILE='TOPOGRAPHY_DATA', STATUS='OLD', &
	590	FORM='FORMATTED', ERR=10 )
	591	DO j = ny, 0, -1
	592	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	593	ENDDO
	594
	595	GOTO 12
	596
	597	10 message_string = 'file TOPOGRAPHY_DATA does not exist'
	598	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	599
	600	11 message_string = 'errors in file TOPOGRAPHY_DATA'
	601	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	602
	603	12 CLOSE( 90 )
	604
	605	ENDIF
[809]	606	#if defined( __parallel ) && ! defined ( __check )
[759]	607	CALL MPI_BARRIER( comm2d, ierr )
	608	#endif
[559]	609	ENDDO
[759]	610
[1]	611	!
	612	!-- Calculate the index height of the topography
	613	DO i = 0, nx
	614	DO j = 0, ny
	615	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	616	ENDDO
	617	ENDDO
[818]	618
	619	DEALLOCATE ( topo_height )
[114]	620	!
[759]	621	!-- Add cyclic boundaries (additional layers are for calculating
	622	!-- flag arrays needed for the multigrid sover)
[114]	623	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	624	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	625	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	626	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	627
[1]	628	CASE DEFAULT
	629	!
	630	!-- The DEFAULT case is reached either if the parameter topography
[217]	631	!-- contains a wrong character string or if the user has defined a special
[1]	632	!-- case in the user interface. There, the subroutine user_init_grid
	633	!-- checks which of these two conditions applies.
[114]	634	CALL user_init_grid( gls, nzb_local )
[1]	635
	636	END SELECT
	637	!
[861]	638	!-- Determine the maximum level of topography. Furthermore it is used for
	639	!-- steering the degradation of order of the applied advection scheme.
[978]	640	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	641	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	642	nzb_max = MAXVAL( nzb_local )
[978]	643	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
	644	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	645	nzb_max = nzt
	646	ENDIF
	647
[861]	648	!
[1]	649	!-- Consistency checks and index array initialization are only required for
[217]	650	!-- non-flat topography, also the initialization of topography height arrays
[49]	651	!-- zu_s_inner and zw_w_inner
[1]	652	IF ( TRIM( topography ) /= 'flat' ) THEN
	653
	654	!
	655	!-- Consistency checks
	656	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[274]	657	WRITE( message_string, * ) 'nzb_local values are outside the', &
	658	'model domain', &
	659	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
	660	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	661	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	662	ENDIF
	663
[722]	664	IF ( bc_lr == 'cyclic' ) THEN
[1]	665	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
	666	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[254]	667	message_string = 'nzb_local does not fulfill cyclic' // &
	668	' boundary condition in x-direction'
	669	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	670	ENDIF
	671	ENDIF
[722]	672	IF ( bc_ns == 'cyclic' ) THEN
[1]	673	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
	674	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[254]	675	message_string = 'nzb_local does not fulfill cyclic' // &
	676	' boundary condition in y-direction'
	677	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	678	ENDIF
	679	ENDIF
	680
[217]	681	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	682	!
[217]	683	!-- The array nzb_local as defined using the 'cell_edge' convention
	684	!-- describes the actual total size of topography which is defined at the
	685	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	686	!-- on the topography walls in y-direction. However, PALM uses individual
	687	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	688	!-- Therefore, the extent of topography in nzb_local is now reduced by
	689	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	690	!-- to form the basis for nzb_s_inner.
	691	DO j = -gls, ny + gls
	692	DO i = -gls, nx
	693	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	694	ENDDO
[134]	695	ENDDO
[217]	696	!-- apply cyclic boundary conditions in x-direction
	697	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	698	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	699	DO i = -gls, nx + gls
	700	DO j = -gls, ny
	701	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	702	ENDDO
[134]	703	ENDDO
[217]	704	!-- apply cyclic boundary conditions in y-direction
	705	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	706	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	707	ENDIF
[134]	708
[1]	709	!
	710	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	711	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	712	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	713
	714	!
	715	!-- Initialize remaining index arrays:
	716	!-- first pre-initialize them with nzb_s_inner...
	717	nzb_u_inner = nzb_s_inner
	718	nzb_u_outer = nzb_s_inner
	719	nzb_v_inner = nzb_s_inner
	720	nzb_v_outer = nzb_s_inner
	721	nzb_w_outer = nzb_s_inner
	722	nzb_s_outer = nzb_s_inner
	723
	724	!
	725	!-- ...then extend pre-initialized arrays in their according directions
	726	!-- based on nzb_local using nzb_tmp as a temporary global index array
	727
	728	!
	729	!-- nzb_s_outer:
	730	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	731	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	732	DO j = -1, ny + 1
	733	DO i = 0, nx
	734	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
	735	nzb_local(j,i+1) )
	736	ENDDO
	737	ENDDO
	738	DO i = nxl, nxr
	739	DO j = nys, nyn
	740	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	741	nzb_tmp(j+1,i) )
	742	ENDDO
	743	!
	744	!-- non-cyclic boundary conditions (overwritten by call of
	745	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	746	IF ( nys == 0 ) THEN
	747	j = -1
	748	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	749	ENDIF
	750	IF ( nys == ny ) THEN
	751	j = ny + 1
	752	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	753	ENDIF
	754	ENDDO
	755	!
	756	!-- nzb_w_outer:
	757	!-- identical to nzb_s_outer
	758	nzb_w_outer = nzb_s_outer
	759
	760	!
	761	!-- nzb_u_inner:
	762	!-- extend nzb_local rightwards only
[667]	763	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	764	DO j = -1, ny + 1
	765	DO i = 0, nx + 1
	766	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	767	ENDDO
	768	ENDDO
[667]	769	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	770
	771	!
	772	!-- nzb_u_outer:
	773	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	774	DO i = nxl, nxr
	775	DO j = nys, nyn
	776	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	777	nzb_tmp(j+1,i) )
	778	ENDDO
	779	!
	780	!-- non-cyclic boundary conditions (overwritten by call of
	781	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	782	IF ( nys == 0 ) THEN
	783	j = -1
	784	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	785	ENDIF
	786	IF ( nys == ny ) THEN
	787	j = ny + 1
	788	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	789	ENDIF
	790	ENDDO
	791
	792	!
	793	!-- nzb_v_inner:
	794	!-- extend nzb_local northwards only
[667]	795	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	796	DO i = -1, nx + 1
	797	DO j = 0, ny + 1
	798	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	799	ENDDO
	800	ENDDO
[667]	801	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	802
	803	!
	804	!-- nzb_v_outer:
	805	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	806	DO j = nys, nyn
	807	DO i = nxl, nxr
	808	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
	809	nzb_tmp(j,i+1) )
	810	ENDDO
	811	!
	812	!-- non-cyclic boundary conditions (overwritten by call of
	813	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	814	IF ( nxl == 0 ) THEN
	815	i = -1
	816	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	817	ENDIF
	818	IF ( nxr == nx ) THEN
	819	i = nx + 1
	820	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	821	ENDIF
	822	ENDDO
[809]	823	#if ! defined ( __check )
[1]	824	!
	825	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	826	!-- boundary conditions, if applicable.
	827	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	828	!-- they do not require exchange and are not included here.
	829	CALL exchange_horiz_2d_int( nzb_u_inner )
	830	CALL exchange_horiz_2d_int( nzb_u_outer )
	831	CALL exchange_horiz_2d_int( nzb_v_inner )
	832	CALL exchange_horiz_2d_int( nzb_v_outer )
	833	CALL exchange_horiz_2d_int( nzb_w_outer )
	834	CALL exchange_horiz_2d_int( nzb_s_outer )
	835
[49]	836	!
	837	!-- Allocate and set the arrays containing the topography height
	838	IF ( myid == 0 ) THEN
	839
	840	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	841
	842	DO i = 0, nx + 1
	843	DO j = 0, ny + 1
	844	zu_s_inner(i,j) = zu(nzb_local(j,i))
	845	zw_w_inner(i,j) = zw(nzb_local(j,i))
	846	ENDDO
	847	ENDDO
	848
	849	ENDIF
[807]	850	#endif
[1]	851	ENDIF
	852
[809]	853	#if ! defined ( __check )
[1]	854	!
	855	!-- Preliminary: to be removed after completion of the topography code!
	856	!-- Set the former default k index arrays nzb_2d
	857	nzb_2d = nzb
	858
	859	!
	860	!-- Set the individual index arrays which define the k index from which on
	861	!-- the usual finite difference form (which does not use surface fluxes) is
	862	!-- applied
	863	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	864	nzb_diff_u = nzb_u_inner + 2
	865	nzb_diff_v = nzb_v_inner + 2
	866	nzb_diff_s_inner = nzb_s_inner + 2
	867	nzb_diff_s_outer = nzb_s_outer + 2
	868	ELSE
	869	nzb_diff_u = nzb_u_inner + 1
	870	nzb_diff_v = nzb_v_inner + 1
	871	nzb_diff_s_inner = nzb_s_inner + 1
	872	nzb_diff_s_outer = nzb_s_outer + 1
	873	ENDIF
	874
	875	!
	876	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	877	!-- for limitation of near-wall mixing length l_wall further below
	878	corner_nl = 0
	879	corner_nr = 0
	880	corner_sl = 0
	881	corner_sr = 0
	882	wall_l = 0
	883	wall_n = 0
	884	wall_r = 0
	885	wall_s = 0
	886
	887	DO i = nxl, nxr
	888	DO j = nys, nyn
	889	!
	890	!-- u-component
	891	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
	892	wall_u(j,i) = 1.0 ! north wall (location of adjacent fluid)
	893	fym(j,i) = 0.0
	894	fyp(j,i) = 1.0
	895	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
	896	wall_u(j,i) = 1.0 ! south wall (location of adjacent fluid)
	897	fym(j,i) = 1.0
	898	fyp(j,i) = 0.0
	899	ENDIF
	900	!
	901	!-- v-component
	902	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
	903	wall_v(j,i) = 1.0 ! rigth wall (location of adjacent fluid)
	904	fxm(j,i) = 0.0
	905	fxp(j,i) = 1.0
	906	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
	907	wall_v(j,i) = 1.0 ! left wall (location of adjacent fluid)
	908	fxm(j,i) = 1.0
	909	fxp(j,i) = 0.0
	910	ENDIF
	911	!
	912	!-- w-component, also used for scalars, separate arrays for shear
	913	!-- production of tke
	914	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
	915	wall_e_y(j,i) = 1.0 ! north wall (location of adjacent fluid)
	916	wall_w_y(j,i) = 1.0
	917	fwym(j,i) = 0.0
	918	fwyp(j,i) = 1.0
	919	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
	920	wall_e_y(j,i) = -1.0 ! south wall (location of adjacent fluid)
	921	wall_w_y(j,i) = 1.0
	922	fwym(j,i) = 1.0
	923	fwyp(j,i) = 0.0
	924	ENDIF
	925	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
	926	wall_e_x(j,i) = 1.0 ! right wall (location of adjacent fluid)
	927	wall_w_x(j,i) = 1.0
	928	fwxm(j,i) = 0.0
	929	fwxp(j,i) = 1.0
	930	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
	931	wall_e_x(j,i) = -1.0 ! left wall (location of adjacent fluid)
	932	wall_w_x(j,i) = 1.0
	933	fwxm(j,i) = 1.0
	934	fwxp(j,i) = 0.0
	935	ENDIF
	936	!
	937	!-- Wall and corner locations inside buildings for limitation of
	938	!-- near-wall mixing length l_wall
	939	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	940
	941	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	942
	943	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	944	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	945	nzb_s_inner(j,i-1) ) + 1
	946	ENDIF
	947
	948	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	949	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	950	nzb_s_inner(j,i+1) ) + 1
	951	ENDIF
	952
	953	ENDIF
	954
	955	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	956
	957	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	958	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	959	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	960	nzb_s_inner(j,i-1) ) + 1
	961	ENDIF
	962
	963	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	964	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	965	nzb_s_inner(j,i+1) ) + 1
	966	ENDIF
	967
	968	ENDIF
	969
	970	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	971	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	972	ENDIF
	973
	974	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	975	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	976	ENDIF
	977
	978	ENDDO
	979	ENDDO
	980
	981	!
[114]	982	!-- Calculate wall flag arrays for the multigrid method
	983	IF ( psolver == 'multigrid' ) THEN
	984	!
	985	!-- Gridpoint increment of the current level
	986	inc = 1
	987
	988	DO l = maximum_grid_level, 1 , -1
	989
	990	nxl_l = nxl_mg(l)
	991	nxr_l = nxr_mg(l)
	992	nys_l = nys_mg(l)
	993	nyn_l = nyn_mg(l)
	994	nzt_l = nzt_mg(l)
	995
	996	!
	997	!-- Assign the flag level to be calculated
	998	SELECT CASE ( l )
	999	CASE ( 1 )
	1000	flags => wall_flags_1
	1001	CASE ( 2 )
	1002	flags => wall_flags_2
	1003	CASE ( 3 )
	1004	flags => wall_flags_3
	1005	CASE ( 4 )
	1006	flags => wall_flags_4
	1007	CASE ( 5 )
	1008	flags => wall_flags_5
	1009	CASE ( 6 )
	1010	flags => wall_flags_6
	1011	CASE ( 7 )
	1012	flags => wall_flags_7
	1013	CASE ( 8 )
	1014	flags => wall_flags_8
	1015	CASE ( 9 )
	1016	flags => wall_flags_9
	1017	CASE ( 10 )
	1018	flags => wall_flags_10
	1019	END SELECT
	1020
	1021	!
	1022	!-- Depending on the grid level, set the respective bits in case of
	1023	!-- neighbouring walls
	1024	!-- Bit 0: wall to the bottom
	1025	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1026	!-- Bit 2: wall to the south
	1027	!-- Bit 3: wall to the north
	1028	!-- Bit 4: wall to the left
	1029	!-- Bit 5: wall to the right
[116]	1030	!-- Bit 6: inside building
[114]	1031
	1032	flags = 0
	1033
[927]	1034	!
	1035	!-- In case of masking method, flags are not set and multigrid method
	1036	!-- works like FFT-solver
	1037	IF ( .NOT. masking_method ) THEN
	1038
	1039	DO i = nxl_l-1, nxr_l+1
	1040	DO j = nys_l-1, nyn_l+1
	1041	DO k = nzb, nzt_l+1
[114]	1042
	1043	!
[927]	1044	!-- Inside/outside building (inside building does not need
	1045	!-- further tests for walls)
	1046	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1047
[927]	1048	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1049
[927]	1050	ELSE
[114]	1051	!
[927]	1052	!-- Bottom wall
	1053	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1054	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1055	ENDIF
[114]	1056	!
[927]	1057	!-- South wall
	1058	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1059	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1060	ENDIF
[114]	1061	!
[927]	1062	!-- North wall
	1063	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1064	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1065	ENDIF
[114]	1066	!
[927]	1067	!-- Left wall
	1068	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1069	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1070	ENDIF
[114]	1071	!
[927]	1072	!-- Right wall
	1073	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1074	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1075	ENDIF
	1076
[114]	1077	ENDIF
	1078
[927]	1079	ENDDO
[114]	1080	ENDDO
	1081	ENDDO
	1082
[927]	1083	ENDIF
	1084
[114]	1085	!
	1086	!-- Test output of flag arrays
[145]	1087	! i = nxl_l
	1088	! WRITE (9,*) ' '
	1089	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1090	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1091	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1092	! DO k = nzt_l+1, nzb, -1
	1093	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1094	! ENDDO
[114]	1095
	1096	inc = inc * 2
	1097
	1098	ENDDO
	1099
	1100	ENDIF
[861]	1101	!
	1102	!-- Allocate flags needed for masking walls.
	1103	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr) )
	1104	wall_flags_0 = 0
[114]	1105
[861]	1106	IF ( scalar_advec == 'ws-scheme' ) THEN
[114]	1107	!
[861]	1108	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1109	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1110	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1111	!-- grid points.
	1112	DO i = nxl, nxr
	1113	DO j = nys, nyn
	1114	DO k = nzb_s_inner(j,i)+1, nzt
	1115	!
	1116	!-- scalar - x-direction
	1117	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1118	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1119	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1120	.AND. i == nxr ) ) THEN
[861]	1121	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1122	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1123	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1124	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1125	) THEN
[861]	1126	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1127	ELSE
	1128	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1129	ENDIF
	1130	!
	1131	!-- scalar - y-direction
	1132	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1133	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1134	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1135	.AND. j == nyn ) ) THEN
[861]	1136	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1137	!-- WS3
	1138	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1139	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1140	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1141	) THEN
[861]	1142	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1143	!-- WS5
	1144	ELSE
	1145	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1146	ENDIF
	1147	!
	1148	!-- scalar - z-direction
	1149	!-- WS1 (6), WS3 (7), WS5 (8)
	1150	flag_set = .FALSE.
	1151	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1152	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1153	flag_set = .TRUE.
	1154	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1155	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1156	flag_set = .TRUE.
	1157	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1158	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1159	ENDIF
	1160	ENDDO
	1161	ENDDO
	1162	ENDDO
	1163	ENDIF
	1164
	1165	IF ( momentum_advec == 'ws-scheme' ) THEN
	1166	!
	1167	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1168	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1169	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1170	!-- grid points.
	1171	DO i = nxl, nxr
	1172	DO j = nys, nyn
	1173	DO k = nzb_u_inner(j,i)+1, nzt
	1174	!
	1175	!-- u component - x-direction
	1176	!-- WS1 (9), WS3 (10), WS5 (11)
	1177	IF ( k <= nzb_u_inner(j,i+1) &
[978]	1178	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1179	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1180	) THEN
[861]	1181	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1182	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1183	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1184	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1185	) THEN
[861]	1186	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
	1187	ELSE
	1188	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
	1189	ENDIF
[978]	1190
[861]	1191	!
	1192	!-- u component - y-direction
	1193	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1194	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1195	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1196	.AND. j == nyn ) ) THEN
[861]	1197	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1198	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1199	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1200	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1201	) THEN
[861]	1202	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
	1203	ELSE
	1204	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
	1205	ENDIF
	1206	!
	1207	!-- u component - z-direction
	1208	!-- WS1 (15), WS3 (16), WS5 (17)
	1209	flag_set = .FALSE.
	1210	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1211	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1212	flag_set = .TRUE.
	1213	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1214	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1215	flag_set = .TRUE.
	1216	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1217	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1218	ENDIF
	1219
	1220	ENDDO
	1221	ENDDO
	1222	ENDDO
	1223
	1224	DO i = nxl, nxr
	1225	DO j = nys, nyn
	1226	DO k = nzb_v_inner(j,i)+1, nzt
	1227	!
	1228	!-- v component - x-direction
	1229	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1230	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1231	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1232	.AND. i == nxr ) ) THEN
[861]	1233	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1234	!-- WS3
	1235	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1236	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1237	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1238	) THEN
[861]	1239	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
	1240	ELSE
	1241	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
	1242	ENDIF
	1243	!
	1244	!-- v component - y-direction
	1245	!-- WS1 (21), WS3 (22), WS5 (23)
	1246	IF ( k <= nzb_v_inner(j+1,i) &
[978]	1247	.OR. ( ( inflow_s .OR. outflow_s ) .AND. i == nysv ) &
	1248	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1249	) THEN
[861]	1250	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1251	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1252	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1253	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1254	) THEN
[861]	1255	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
	1256	ELSE
	1257	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
	1258	ENDIF
	1259	!
	1260	!-- v component - z-direction
	1261	!-- WS1 (24), WS3 (25), WS5 (26)
	1262	flag_set = .FALSE.
	1263	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1264	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1265	flag_set = .TRUE.
	1266	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1267	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1268	flag_set = .TRUE.
	1269	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1270	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1271	ENDIF
	1272
	1273	ENDDO
	1274	ENDDO
	1275	ENDDO
	1276	DO i = nxl, nxr
	1277	DO j = nys, nyn
[1015]	1278	DO k = nzb_w_inner(j,i), nzt
[861]	1279	!
	1280	!-- w component - x-direction
	1281	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1282	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1283	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1284	.AND. i == nxr ) ) THEN
[861]	1285	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1286	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1287	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1288	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1289	) THEN
[861]	1290	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
	1291	ELSE
	1292	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
	1293	ENDIF
	1294	!
	1295	!-- w component - y-direction
	1296	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1297	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1298	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1299	.AND. j == nyn ) ) THEN
[861]	1300	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1301	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1302	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1303	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1304	) THEN
[861]	1305	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
	1306	ELSE
	1307	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 32 )
	1308	ENDIF
	1309	!
	1310	!-- w component - z-direction
	1311	!-- WS1 (33), WS3 (34), WS5 (35)
	1312	flag_set = .FALSE.
	1313	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1314	.OR. k == nzt ) THEN
	1315	!
	1316	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1317	!-- set, although this is not a prognostic level. However,
	1318	!-- contrary to the advection of u,v and s this is necessary
	1319	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1320	!-- at k == nzb_w_inner(j,i)+1.
	1321	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 33 )
	1322	flag_set = .TRUE.
	1323	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1324	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 34 )
	1325	flag_set = .TRUE.
	1326	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
	1327	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 35 )
	1328	ENDIF
	1329
	1330	ENDDO
	1331	ENDDO
	1332	ENDDO
	1333
	1334	ENDIF
	1335
	1336	!
[1]	1337	!-- In case of topography: limit near-wall mixing length l_wall further:
	1338	!-- Go through all points of the subdomain one by one and look for the closest
	1339	!-- surface
	1340	IF ( TRIM(topography) /= 'flat' ) THEN
	1341	DO i = nxl, nxr
	1342	DO j = nys, nyn
	1343
	1344	nzb_si = nzb_s_inner(j,i)
	1345	vi = vertical_influence(nzb_si)
	1346
	1347	IF ( wall_n(j,i) > 0 ) THEN
	1348	!
	1349	!-- North wall (y distance)
	1350	DO k = wall_n(j,i), nzb_si
	1351	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5 * dy )
	1352	ENDDO
	1353	!
	1354	!-- Above North wall (yz distance)
	1355	DO k = nzb_si + 1, nzb_si + vi
	1356	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1357	SQRT( 0.25 * dy**2 + &
	1358	( zu(k) - zw(nzb_si) )**2 ) )
	1359	ENDDO
	1360	!
	1361	!-- Northleft corner (xy distance)
	1362	IF ( corner_nl(j,i) > 0 ) THEN
	1363	DO k = corner_nl(j,i), nzb_si
	1364	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1365	0.5 * SQRT( dx2 + dy2 ) )
	1366	ENDDO
	1367	!
	1368	!-- Above Northleft corner (xyz distance)
	1369	DO k = nzb_si + 1, nzb_si + vi
	1370	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1371	SQRT( 0.25 * (dx2 + dy2) + &
	1372	( zu(k) - zw(nzb_si) )**2 ) )
	1373	ENDDO
	1374	ENDIF
	1375	!
	1376	!-- Northright corner (xy distance)
	1377	IF ( corner_nr(j,i) > 0 ) THEN
	1378	DO k = corner_nr(j,i), nzb_si
	1379	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1380	0.5 * SQRT( dx2 + dy2 ) )
	1381	ENDDO
	1382	!
	1383	!-- Above northright corner (xyz distance)
	1384	DO k = nzb_si + 1, nzb_si + vi
	1385	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1386	SQRT( 0.25 * (dx2 + dy2) + &
	1387	( zu(k) - zw(nzb_si) )**2 ) )
	1388	ENDDO
	1389	ENDIF
	1390	ENDIF
	1391
	1392	IF ( wall_s(j,i) > 0 ) THEN
	1393	!
	1394	!-- South wall (y distance)
	1395	DO k = wall_s(j,i), nzb_si
	1396	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5 * dy )
	1397	ENDDO
	1398	!
	1399	!-- Above south wall (yz distance)
	1400	DO k = nzb_si + 1, &
	1401	nzb_si + vi
	1402	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1403	SQRT( 0.25 * dy**2 + &
	1404	( zu(k) - zw(nzb_si) )**2 ) )
	1405	ENDDO
	1406	!
	1407	!-- Southleft corner (xy distance)
	1408	IF ( corner_sl(j,i) > 0 ) THEN
	1409	DO k = corner_sl(j,i), nzb_si
	1410	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1411	0.5 * SQRT( dx2 + dy2 ) )
	1412	ENDDO
	1413	!
	1414	!-- Above southleft corner (xyz distance)
	1415	DO k = nzb_si + 1, nzb_si + vi
	1416	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1417	SQRT( 0.25 * (dx2 + dy2) + &
	1418	( zu(k) - zw(nzb_si) )**2 ) )
	1419	ENDDO
	1420	ENDIF
	1421	!
	1422	!-- Southright corner (xy distance)
	1423	IF ( corner_sr(j,i) > 0 ) THEN
	1424	DO k = corner_sr(j,i), nzb_si
	1425	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1426	0.5 * SQRT( dx2 + dy2 ) )
	1427	ENDDO
	1428	!
	1429	!-- Above southright corner (xyz distance)
	1430	DO k = nzb_si + 1, nzb_si + vi
	1431	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1432	SQRT( 0.25 * (dx2 + dy2) + &
	1433	( zu(k) - zw(nzb_si) )**2 ) )
	1434	ENDDO
	1435	ENDIF
	1436
	1437	ENDIF
	1438
	1439	IF ( wall_l(j,i) > 0 ) THEN
	1440	!
	1441	!-- Left wall (x distance)
	1442	DO k = wall_l(j,i), nzb_si
	1443	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5 * dx )
	1444	ENDDO
	1445	!
	1446	!-- Above left wall (xz distance)
	1447	DO k = nzb_si + 1, nzb_si + vi
	1448	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1449	SQRT( 0.25 * dx**2 + &
	1450	( zu(k) - zw(nzb_si) )**2 ) )
	1451	ENDDO
	1452	ENDIF
	1453
	1454	IF ( wall_r(j,i) > 0 ) THEN
	1455	!
	1456	!-- Right wall (x distance)
	1457	DO k = wall_r(j,i), nzb_si
	1458	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5 * dx )
	1459	ENDDO
	1460	!
	1461	!-- Above right wall (xz distance)
	1462	DO k = nzb_si + 1, nzb_si + vi
	1463	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1464	SQRT( 0.25 * dx**2 + &
	1465	( zu(k) - zw(nzb_si) )**2 ) )
	1466	ENDDO
	1467
	1468	ENDIF
	1469
	1470	ENDDO
	1471	ENDDO
	1472
	1473	ENDIF
	1474
	1475	!
	1476	!-- Multiplication with wall_adjustment_factor
	1477	l_wall = wall_adjustment_factor * l_wall
	1478
	1479	!
[709]	1480	!-- Set lateral boundary conditions for l_wall
[667]	1481	CALL exchange_horiz( l_wall, nbgp )
	1482
[1]	1483	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1484	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1485
[807]	1486	#endif
[1]	1487
	1488	END SUBROUTINE init_grid

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

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |