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source: palm/trunk/SOURCE/init_grid.f90 @ 1450

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

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