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source: palm/trunk/SOURCE/init_grid.f90 @ 1580

Last change on this file since 1580 was 1580, checked in by suehring, 9 years ago
Bugfix: setting flags for 5th-order advection scheme, and stastical evaluation of scalar fluxes in 5th-order scheme in case of monotonic limiter.
Property svn:keywords set to `Id`
File size: 62.9 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	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[1580]	22	! Bugfix: setting flags for 5th order scheme near buildings.
[1576]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1580 2015-04-10 13:43:49Z suehring $
	27	!
[1576]	28	! 1575 2015-03-27 09:56:27Z raasch
	29	! adjustments for psolver-queries
	30	!
[1558]	31	! 1557 2015-03-05 16:43:04Z suehring
	32	! Adjustment for monotoinic limiter
	33	!
[1419]	34	! 1418 2014-06-06 13:05:08Z fricke
	35	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	36	! condition and a negative value for dz_stretch_level the condition
	37	! was always true for the whole model domain
	38	!
[1410]	39	! 1409 2014-05-23 12:11:32Z suehring
	40	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	41	! j <= nysv
	42	!
[1354]	43	! 1353 2014-04-08 15:21:23Z heinze
	44	! REAL constants provided with KIND-attribute
	45	!
[1323]	46	! 1322 2014-03-20 16:38:49Z raasch
	47	! REAL constants defined as wp-kind
	48	!
[1321]	49	! 1320 2014-03-20 08:40:49Z raasch
[1320]	50	! ONLY-attribute added to USE-statements,
	51	! kind-parameters added to all INTEGER and REAL declaration statements,
	52	! kinds are defined in new module kinds,
	53	! revision history before 2012 removed,
	54	! comment fields (!:) to be used for variable explanations added to
	55	! all variable declaration statements
[1321]	56	!
[1222]	57	! 1221 2013-09-10 08:59:13Z raasch
	58	! wall_flags_00 introduced to hold bits 32-63,
	59	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	60	! loops optimized for openACC (pres + flow_statistics)
	61	!
[1093]	62	! 1092 2013-02-02 11:24:22Z raasch
	63	! unused variables removed
	64	!
[1070]	65	! 1069 2012-11-28 16:18:43Z maronga
	66	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	67	! model in case of coupled runs
	68	!
[1037]	69	! 1036 2012-10-22 13:43:42Z raasch
	70	! code put under GPL (PALM 3.9)
	71	!
[1017]	72	! 1015 2012-09-27 09:23:24Z raasch
	73	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	74	! nzb_w_inner+1
	75	!
[997]	76	! 996 2012-09-07 10:41:47Z raasch
	77	! little reformatting
	78	!
[979]	79	! 978 2012-08-09 08:28:32Z fricke
	80	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	81	! Bugfix: Set wall_flags_0 for inflow boundary
	82	!
[928]	83	! 927 2012-06-06 19:15:04Z raasch
	84	! Wall flags are not set for multigrid method in case of masking method
	85	!
[865]	86	! 864 2012-03-27 15:10:33Z gryschka
[927]	87	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	88	! were not correctly defined for k=1.
[865]	89	!
[863]	90	! 861 2012-03-26 14:18:34Z suehring
[861]	91	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	92	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	93	! model domain.!
[861]	94	! Initialization of nzb_s_inner and nzb_w_inner.
	95	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	96	! while setting wall_flags_0
	97	!
[844]	98	! 843 2012-02-29 15:16:21Z gryschka
	99	! In case of ocean and dirichlet bc for u and v at the bottom
	100	! the first u-level ist defined at same height as the first w-level
	101	!
[819]	102	! 818 2012-02-08 16:11:23Z maronga
	103	! Bugfix: topo_height is only required if topography is used. It is thus now
	104	! allocated in the topography branch
	105	!
[810]	106	! 809 2012-01-30 13:32:58Z maronga
	107	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	108	!
[808]	109	! 807 2012-01-25 11:53:51Z maronga
	110	! New cpp directive "__check" implemented which is used by check_namelist_files
	111	!
[1]	112	! Revision 1.1 1997/08/11 06:17:45 raasch
	113	! Initial revision (Testversion)
	114	!
	115	!
	116	! Description:
	117	! ------------
	118	! Creating grid depending constants
	119	!------------------------------------------------------------------------------!
	120
[1320]	121	USE arrays_3d, &
	122	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	123	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	124
[1353]	125	USE control_parameters, &
[1320]	126	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	127	building_length_y, building_wall_left, building_wall_south, &
	128	canyon_height, canyon_wall_left, canyon_wall_south, &
	129	canyon_width_x, canyon_width_y, coupling_char, dp_level_ind_b, &
	130	dz, dz_max, dz_stretch_factor, dz_stretch_level, &
	131	dz_stretch_level_index, ibc_uv_b, io_blocks, io_group, &
	132	inflow_l, inflow_n, inflow_r, inflow_s, masking_method, &
	133	maximum_grid_level, message_string, momentum_advec, ocean, &
	134	outflow_l, outflow_n, outflow_r, outflow_s, prandtl_layer, &
	135	psolver, scalar_advec, topography, topography_grid_convention, &
	136	use_surface_fluxes, use_top_fluxes, wall_adjustment_factor
	137
	138	USE grid_variables, &
	139	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	140	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	141	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	142
	143	USE indices, &
	144	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	145	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	146	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	147	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	148	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	149	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	150	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	151	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	152	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	153	wall_flags_9
	154
	155	USE kinds
	156
[1]	157	USE pegrid
	158
	159	IMPLICIT NONE
	160
[1320]	161	INTEGER(iwp) :: bh !:
	162	INTEGER(iwp) :: blx !:
	163	INTEGER(iwp) :: bly !:
	164	INTEGER(iwp) :: bxl !:
	165	INTEGER(iwp) :: bxr !:
	166	INTEGER(iwp) :: byn !:
	167	INTEGER(iwp) :: bys !:
	168	INTEGER(iwp) :: ch !:
	169	INTEGER(iwp) :: cwx !:
	170	INTEGER(iwp) :: cwy !:
	171	INTEGER(iwp) :: cxl !:
	172	INTEGER(iwp) :: cxr !:
	173	INTEGER(iwp) :: cyn !:
	174	INTEGER(iwp) :: cys !:
	175	INTEGER(iwp) :: gls !:
	176	INTEGER(iwp) :: i !:
	177	INTEGER(iwp) :: ii !:
	178	INTEGER(iwp) :: inc !:
	179	INTEGER(iwp) :: j !:
	180	INTEGER(iwp) :: k !:
	181	INTEGER(iwp) :: l !:
	182	INTEGER(iwp) :: nxl_l !:
	183	INTEGER(iwp) :: nxr_l !:
	184	INTEGER(iwp) :: nyn_l !:
	185	INTEGER(iwp) :: nys_l !:
	186	INTEGER(iwp) :: nzb_si !:
	187	INTEGER(iwp) :: nzt_l !:
	188	INTEGER(iwp) :: vi !:
[1]	189
[1320]	190	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !:
[1]	191
[1320]	192	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !:
	193	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !:
	194	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !:
	195	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !:
	196	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !:
	197	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !:
	198	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !:
	199	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !:
	200	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !:
	201	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !:
[1]	202
[1320]	203	LOGICAL :: flag_set = .FALSE. !:
[861]	204
[1320]	205	REAL(wp) :: dx_l !:
	206	REAL(wp) :: dy_l !:
	207	REAL(wp) :: dz_stretched !:
[1]	208
[1320]	209	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !:
[1]	210
[667]	211
[1]	212	!
[709]	213	!-- Calculation of horizontal array bounds including ghost layers
[667]	214	nxlg = nxl - nbgp
	215	nxrg = nxr + nbgp
	216	nysg = nys - nbgp
	217	nyng = nyn + nbgp
[709]	218
[667]	219	!
[1]	220	!-- Allocate grid arrays
[1353]	221	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	222	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	223
	224	!
	225	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	226	IF ( dz == -1.0_wp ) THEN
[254]	227	message_string = 'missing dz'
	228	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	229	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	230	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	231	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	232	ENDIF
[94]	233
[1]	234	!
[94]	235	!-- Define the vertical grid levels
	236	IF ( .NOT. ocean ) THEN
	237	!
	238	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	239	!-- The second u-level (k=1) corresponds to the top of the
[94]	240	!-- Prandtl-layer.
[667]	241
	242	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	243	zu(0) = 0.0_wp
	244	! zu(0) = - dz * 0.5_wp
[667]	245	ELSE
[1353]	246	zu(0) = - dz * 0.5_wp
[667]	247	ENDIF
[1353]	248	zu(1) = dz * 0.5_wp
[1]	249
[94]	250	dz_stretch_level_index = nzt+1
	251	dz_stretched = dz
	252	DO k = 2, nzt+1
	253	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	254	dz_stretched = dz_stretched * dz_stretch_factor
	255	dz_stretched = MIN( dz_stretched, dz_max )
	256	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	257	ENDIF
	258	zu(k) = zu(k-1) + dz_stretched
	259	ENDDO
[1]	260
	261	!
[94]	262	!-- Compute the w-levels. They are always staggered half-way between the
[843]	263	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	264	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	265	!-- The top w-level is extrapolated linearly.
[1353]	266	zw(0) = 0.0_wp
[94]	267	DO k = 1, nzt
[1353]	268	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	269	ENDDO
[1353]	270	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	271
[94]	272	ELSE
[1]	273	!
[843]	274	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	275	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	276	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	277	!-- w-level are defined at same height, but staggered from the second level.
	278	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	279	zu(nzt+1) = dz * 0.5_wp
	280	zu(nzt) = - dz * 0.5_wp
[94]	281
	282	dz_stretch_level_index = 0
	283	dz_stretched = dz
	284	DO k = nzt-1, 0, -1
[1418]	285	!
	286	!-- The default value of dz_stretch_level is positive, thus the first
	287	!-- condition is always true. Hence, the second condition is necessary.
	288	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	289	.AND. dz_stretched < dz_max ) THEN
[94]	290	dz_stretched = dz_stretched * dz_stretch_factor
	291	dz_stretched = MIN( dz_stretched, dz_max )
	292	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	293	ENDIF
	294	zu(k) = zu(k+1) - dz_stretched
	295	ENDDO
	296
	297	!
	298	!-- Compute the w-levels. They are always staggered half-way between the
[843]	299	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	300	!-- at the ground. In this case the first u- and w-level are defined at
	301	!-- same height. The top w-level (nzt+1) is not used but set for
	302	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	303	zw(nzt+1) = dz
[1353]	304	zw(nzt) = 0.0_wp
[94]	305	DO k = 0, nzt
[1353]	306	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	307	ENDDO
	308
[843]	309	!
	310	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	311	!-- at same height.
	312	IF ( ibc_uv_b == 0 ) THEN
	313	zu(0) = zw(0)
	314	ENDIF
	315
[94]	316	ENDIF
	317
	318	!
[1]	319	!-- Compute grid lengths.
	320	DO k = 1, nzt+1
	321	dzu(k) = zu(k) - zu(k-1)
[1353]	322	ddzu(k) = 1.0_wp / dzu(k)
[1]	323	dzw(k) = zw(k) - zw(k-1)
[1353]	324	ddzw(k) = 1.0_wp / dzw(k)
[1]	325	ENDDO
	326
	327	DO k = 1, nzt
[1353]	328	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	329	ENDDO
[667]	330
	331	!
[709]	332	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	333	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	334	!-- is only dz/2, but should be dz. Therefore, an additional array
	335	!-- containing with appropriate grid information is created for these
	336	!-- solvers.
[1575]	337	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	338	ALLOCATE( ddzu_pres(1:nzt+1) )
	339	ddzu_pres = ddzu
[864]	340	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	341	ENDIF
[1]	342
	343	!
	344	!-- In case of multigrid method, compute grid lengths and grid factors for the
	345	!-- grid levels
[1575]	346	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	347
	348	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	349	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	350	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	351	f1_mg(nzb+1:nzt,maximum_grid_level), &
	352	f2_mg(nzb+1:nzt,maximum_grid_level), &
	353	f3_mg(nzb+1:nzt,maximum_grid_level) )
	354
	355	dzu_mg(:,maximum_grid_level) = dzu
[667]	356	!
[864]	357	!-- Next line to ensure an equally spaced grid.
	358	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	359
[1]	360	dzw_mg(:,maximum_grid_level) = dzw
	361	nzt_l = nzt
	362	DO l = maximum_grid_level-1, 1, -1
[1353]	363	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	364	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	365	nzt_l = nzt_l / 2
	366	DO k = 2, nzt_l+1
	367	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	368	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	369	ENDDO
	370	ENDDO
	371
	372	nzt_l = nzt
	373	dx_l = dx
	374	dy_l = dy
	375	DO l = maximum_grid_level, 1, -1
[1353]	376	ddx2_mg(l) = 1.0_wp / dx_l**2
	377	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	378	DO k = nzb+1, nzt_l
[1353]	379	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	380	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	381	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	382	f2_mg(k,l) + f3_mg(k,l)
	383	ENDDO
	384	nzt_l = nzt_l / 2
[1353]	385	dx_l = dx_l * 2.0_wp
	386	dy_l = dy_l * 2.0_wp
[1]	387	ENDDO
	388
	389	ENDIF
	390
	391	!
	392	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	393	ddx = 1.0_wp / dx
	394	ddy = 1.0_wp / dy
[1]	395	dx2 = dx * dx
	396	dy2 = dy * dy
[1353]	397	ddx2 = 1.0_wp / dx2
	398	ddy2 = 1.0_wp / dy2
[1]	399
	400	!
	401	!-- Compute the grid-dependent mixing length.
	402	DO k = 1, nzt
[1322]	403	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	404	ENDDO
	405
	406	!
	407	!-- Allocate outer and inner index arrays for topography and set
[114]	408	!-- defaults.
	409	!-- nzb_local has to contain additional layers of ghost points for calculating
	410	!-- the flag arrays needed for the multigrid method
	411	gls = 2**( maximum_grid_level )
[861]	412	IF ( gls < nbgp ) gls = nbgp
[667]	413
[114]	414	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	415	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	416	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	417	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	418	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	419	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	420	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	421	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	422	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	423	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	424	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	425	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	426	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	427	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	428	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	429	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	430	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	431	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	432	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	433	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	434	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	435	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	436	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	437	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	438	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	439	wall_e_x(nysg:nyng,nxlg:nxrg), &
	440	wall_e_y(nysg:nyng,nxlg:nxrg), &
	441	wall_u(nysg:nyng,nxlg:nxrg), &
	442	wall_v(nysg:nyng,nxlg:nxrg), &
	443	wall_w_x(nysg:nyng,nxlg:nxrg), &
	444	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	445
	446
[667]	447
	448	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	449
[818]	450
[1]	451	nzb_s_inner = nzb; nzb_s_outer = nzb
	452	nzb_u_inner = nzb; nzb_u_outer = nzb
	453	nzb_v_inner = nzb; nzb_v_outer = nzb
	454	nzb_w_inner = nzb; nzb_w_outer = nzb
	455
[1353]	456	rflags_s_inner = 1.0_wp
	457	rflags_invers = 1.0_wp
[1221]	458
[1]	459	!
[19]	460	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	461	!-- form (which does not use surface fluxes) is applied
	462	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	463	nzb_diff = nzb + 2
	464	ELSE
	465	nzb_diff = nzb + 1
	466	ENDIF
[19]	467	IF ( use_top_fluxes ) THEN
	468	nzt_diff = nzt - 1
	469	ELSE
	470	nzt_diff = nzt
	471	ENDIF
[1]	472
	473	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	474	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	475
[1353]	476	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	477	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	478	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	479	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	480
	481	!
	482	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	483	!-- for the moment,
	484	!-- multiplication with wall_adjustment_factor near the end of this routine
	485	l_wall(nzb,:,:) = l_grid(1)
	486	DO k = nzb+1, nzt
	487	l_wall(k,:,:) = l_grid(k)
	488	ENDDO
	489	l_wall(nzt+1,:,:) = l_grid(nzt)
	490
	491	ALLOCATE ( vertical_influence(nzb:nzt) )
	492	DO k = 1, nzt
	493	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	494	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	495	ENDDO
	496
	497	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	498	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	499	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	500	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	501	'threshold given by only local', &
	502	' &horizontal reduction of near_wall ', &
	503	'mixing length l_wall', &
	504	' &starting from height level k = ', k, '.'
	505	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	506	EXIT
	507	ENDIF
	508	ENDDO
	509	vertical_influence(0) = vertical_influence(1)
	510
[667]	511	DO i = nxlg, nxrg
	512	DO j = nysg, nyng
[1]	513	DO k = nzb_s_inner(j,i) + 1, &
	514	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	515	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	516	ENDDO
	517	ENDDO
	518	ENDDO
	519
	520	!
	521	!-- Set outer and inner index arrays for non-flat topography.
	522	!-- Here consistency checks concerning domain size and periodicity are
	523	!-- necessary.
	524	!-- Within this SELECT CASE structure only nzb_local is initialized
	525	!-- individually depending on the chosen topography type, all other index
	526	!-- arrays are initialized further below.
	527	SELECT CASE ( TRIM( topography ) )
	528
	529	CASE ( 'flat' )
	530	!
[555]	531	!-- nzb_local is required for the multigrid solver
	532	nzb_local = 0
[1]	533
	534	CASE ( 'single_building' )
	535	!
	536	!-- Single rectangular building, by default centered in the middle of the
	537	!-- total domain
	538	blx = NINT( building_length_x / dx )
	539	bly = NINT( building_length_y / dy )
	540	bh = NINT( building_height / dz )
	541
[1322]	542	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	543	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	544	ENDIF
	545	bxl = NINT( building_wall_left / dx )
	546	bxr = bxl + blx
	547
[1322]	548	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	549	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	550	ENDIF
	551	bys = NINT( building_wall_south / dy )
	552	byn = bys + bly
	553
	554	!
	555	!-- Building size has to meet some requirements
	556	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	557	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	558	WRITE( message_string, * ) 'inconsistent building parameters:', &
	559	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	560	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	561	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	562	ENDIF
	563
	564	!
[217]	565	!-- Define the building.
[1]	566	nzb_local = 0
[134]	567	nzb_local(bys:byn,bxl:bxr) = bh
[1]	568
[240]	569	CASE ( 'single_street_canyon' )
	570	!
	571	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	572	!-- The canyon is centered in the other direction by default.
[1322]	573	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	574	!
	575	!-- Street canyon in y direction
	576	cwx = NINT( canyon_width_x / dx )
[1322]	577	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	578	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	579	ENDIF
	580	cxl = NINT( canyon_wall_left / dx )
	581	cxr = cxl + cwx
	582
[1322]	583	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	584	!
	585	!-- Street canyon in x direction
	586	cwy = NINT( canyon_width_y / dy )
[1322]	587	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	588	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	589	ENDIF
	590	cys = NINT( canyon_wall_south / dy )
	591	cyn = cys + cwy
	592
	593	ELSE
[254]	594
	595	message_string = 'no street canyon width given'
	596	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	597
[240]	598	ENDIF
	599
	600	ch = NINT( canyon_height / dz )
	601	dp_level_ind_b = ch
	602	!
	603	!-- Street canyon size has to meet some requirements
[1322]	604	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	605	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	606	( ch < 3 ) ) THEN
[1353]	607	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	608	'&cxl=', cxl, 'cxr=', cxr, &
	609	'cwx=', cwx, &
[254]	610	'ch=', ch, 'nx=', nx, 'ny=', ny
	611	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	612	ENDIF
[1322]	613	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	614	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	615	( ch < 3 ) ) THEN
[1353]	616	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	617	'&cys=', cys, 'cyn=', cyn, &
	618	'cwy=', cwy, &
[254]	619	'ch=', ch, 'nx=', nx, 'ny=', ny
	620	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	621	ENDIF
	622	ENDIF
[1353]	623	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	624	canyon_width_y /= 9999999.9_wp ) THEN
	625	message_string = 'inconsistent canyon parameters:' // &
	626	'&street canyon can only be oriented' // &
[254]	627	'&either in x- or in y-direction'
	628	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	629	ENDIF
	630
	631	nzb_local = ch
[1322]	632	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	633	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	634	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	635	nzb_local(cys+1:cyn-1,:) = 0
	636	ENDIF
	637
[1]	638	CASE ( 'read_from_file' )
[759]	639
[818]	640	ALLOCATE ( topo_height(0:ny,0:nx) )
	641
[759]	642	DO ii = 0, io_blocks-1
	643	IF ( ii == io_group ) THEN
	644
[1]	645	!
[759]	646	!-- Arbitrary irregular topography data in PALM format (exactly
	647	!-- matching the grid size and total domain size)
[1069]	648	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	649	FORM='FORMATTED', ERR=10 )
	650	DO j = ny, 0, -1
	651	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	652	ENDDO
	653
	654	GOTO 12
	655
[1069]	656	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	657	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	658
[1069]	659	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	660	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	661
	662	12 CLOSE( 90 )
	663
	664	ENDIF
[809]	665	#if defined( __parallel ) && ! defined ( __check )
[759]	666	CALL MPI_BARRIER( comm2d, ierr )
	667	#endif
[559]	668	ENDDO
[759]	669
[1]	670	!
	671	!-- Calculate the index height of the topography
	672	DO i = 0, nx
	673	DO j = 0, ny
	674	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	675	ENDDO
	676	ENDDO
[818]	677
	678	DEALLOCATE ( topo_height )
[114]	679	!
[759]	680	!-- Add cyclic boundaries (additional layers are for calculating
	681	!-- flag arrays needed for the multigrid sover)
[114]	682	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	683	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	684	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	685	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	686
[1]	687	CASE DEFAULT
	688	!
	689	!-- The DEFAULT case is reached either if the parameter topography
[217]	690	!-- contains a wrong character string or if the user has defined a special
[1]	691	!-- case in the user interface. There, the subroutine user_init_grid
	692	!-- checks which of these two conditions applies.
[114]	693	CALL user_init_grid( gls, nzb_local )
[1]	694
	695	END SELECT
	696	!
[861]	697	!-- Determine the maximum level of topography. Furthermore it is used for
	698	!-- steering the degradation of order of the applied advection scheme.
[978]	699	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	700	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	701	nzb_max = MAXVAL( nzb_local )
[1353]	702	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[978]	703	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	704	nzb_max = nzt
	705	ENDIF
	706
[861]	707	!
[1]	708	!-- Consistency checks and index array initialization are only required for
[217]	709	!-- non-flat topography, also the initialization of topography height arrays
[49]	710	!-- zu_s_inner and zw_w_inner
[1]	711	IF ( TRIM( topography ) /= 'flat' ) THEN
	712
	713	!
	714	!-- Consistency checks
	715	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	716	WRITE( message_string, * ) 'nzb_local values are outside the', &
	717	'model domain', &
	718	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	719	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	720	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	721	ENDIF
	722
[722]	723	IF ( bc_lr == 'cyclic' ) THEN
[1353]	724	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	725	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	726	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	727	' boundary condition in x-direction'
	728	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	729	ENDIF
	730	ENDIF
[722]	731	IF ( bc_ns == 'cyclic' ) THEN
[1353]	732	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	733	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	734	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	735	' boundary condition in y-direction'
	736	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	737	ENDIF
	738	ENDIF
	739
[217]	740	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	741	!
[217]	742	!-- The array nzb_local as defined using the 'cell_edge' convention
	743	!-- describes the actual total size of topography which is defined at the
	744	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	745	!-- on the topography walls in y-direction. However, PALM uses individual
	746	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	747	!-- Therefore, the extent of topography in nzb_local is now reduced by
	748	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	749	!-- to form the basis for nzb_s_inner.
	750	DO j = -gls, ny + gls
	751	DO i = -gls, nx
	752	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	753	ENDDO
[134]	754	ENDDO
[217]	755	!-- apply cyclic boundary conditions in x-direction
	756	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	757	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	758	DO i = -gls, nx + gls
	759	DO j = -gls, ny
	760	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	761	ENDDO
[134]	762	ENDDO
[217]	763	!-- apply cyclic boundary conditions in y-direction
	764	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	765	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	766	ENDIF
[134]	767
[1]	768	!
	769	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	770	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	771	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	772
	773	!
	774	!-- Initialize remaining index arrays:
	775	!-- first pre-initialize them with nzb_s_inner...
	776	nzb_u_inner = nzb_s_inner
	777	nzb_u_outer = nzb_s_inner
	778	nzb_v_inner = nzb_s_inner
	779	nzb_v_outer = nzb_s_inner
	780	nzb_w_outer = nzb_s_inner
	781	nzb_s_outer = nzb_s_inner
	782
	783	!
	784	!-- ...then extend pre-initialized arrays in their according directions
	785	!-- based on nzb_local using nzb_tmp as a temporary global index array
	786
	787	!
	788	!-- nzb_s_outer:
	789	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	790	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	791	DO j = -1, ny + 1
	792	DO i = 0, nx
[1353]	793	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	794	nzb_local(j,i+1) )
	795	ENDDO
	796	ENDDO
	797	DO i = nxl, nxr
	798	DO j = nys, nyn
[1353]	799	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	800	nzb_tmp(j+1,i) )
	801	ENDDO
	802	!
	803	!-- non-cyclic boundary conditions (overwritten by call of
	804	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	805	IF ( nys == 0 ) THEN
	806	j = -1
	807	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	808	ENDIF
	809	IF ( nys == ny ) THEN
	810	j = ny + 1
	811	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	812	ENDIF
	813	ENDDO
	814	!
	815	!-- nzb_w_outer:
	816	!-- identical to nzb_s_outer
	817	nzb_w_outer = nzb_s_outer
	818
	819	!
	820	!-- nzb_u_inner:
	821	!-- extend nzb_local rightwards only
[667]	822	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	823	DO j = -1, ny + 1
	824	DO i = 0, nx + 1
	825	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	826	ENDDO
	827	ENDDO
[667]	828	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	829
	830	!
	831	!-- nzb_u_outer:
	832	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	833	DO i = nxl, nxr
	834	DO j = nys, nyn
[1353]	835	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	836	nzb_tmp(j+1,i) )
	837	ENDDO
	838	!
	839	!-- non-cyclic boundary conditions (overwritten by call of
	840	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	841	IF ( nys == 0 ) THEN
	842	j = -1
	843	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	844	ENDIF
	845	IF ( nys == ny ) THEN
	846	j = ny + 1
	847	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	848	ENDIF
	849	ENDDO
	850
	851	!
	852	!-- nzb_v_inner:
	853	!-- extend nzb_local northwards only
[667]	854	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	855	DO i = -1, nx + 1
	856	DO j = 0, ny + 1
	857	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	858	ENDDO
	859	ENDDO
[667]	860	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	861
	862	!
	863	!-- nzb_v_outer:
	864	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	865	DO j = nys, nyn
	866	DO i = nxl, nxr
[1353]	867	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	868	nzb_tmp(j,i+1) )
	869	ENDDO
	870	!
	871	!-- non-cyclic boundary conditions (overwritten by call of
	872	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	873	IF ( nxl == 0 ) THEN
	874	i = -1
	875	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	876	ENDIF
	877	IF ( nxr == nx ) THEN
	878	i = nx + 1
	879	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	880	ENDIF
	881	ENDDO
[809]	882	#if ! defined ( __check )
[1]	883	!
	884	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	885	!-- boundary conditions, if applicable.
	886	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	887	!-- they do not require exchange and are not included here.
	888	CALL exchange_horiz_2d_int( nzb_u_inner )
	889	CALL exchange_horiz_2d_int( nzb_u_outer )
	890	CALL exchange_horiz_2d_int( nzb_v_inner )
	891	CALL exchange_horiz_2d_int( nzb_v_outer )
	892	CALL exchange_horiz_2d_int( nzb_w_outer )
	893	CALL exchange_horiz_2d_int( nzb_s_outer )
	894
[49]	895	!
	896	!-- Allocate and set the arrays containing the topography height
	897	IF ( myid == 0 ) THEN
	898
	899	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	900
	901	DO i = 0, nx + 1
	902	DO j = 0, ny + 1
	903	zu_s_inner(i,j) = zu(nzb_local(j,i))
	904	zw_w_inner(i,j) = zw(nzb_local(j,i))
	905	ENDDO
	906	ENDDO
	907
	908	ENDIF
[1221]	909	!
	910	!-- Set flag arrays to be used for masking of grid points
	911	DO i = nxlg, nxrg
	912	DO j = nysg, nyng
	913	DO k = nzb, nzt+1
[1353]	914	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	915	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	916	ENDDO
	917	ENDDO
	918	ENDDO
[807]	919	#endif
[1]	920	ENDIF
	921
[809]	922	#if ! defined ( __check )
[1]	923	!
	924	!-- Preliminary: to be removed after completion of the topography code!
	925	!-- Set the former default k index arrays nzb_2d
	926	nzb_2d = nzb
	927
	928	!
	929	!-- Set the individual index arrays which define the k index from which on
	930	!-- the usual finite difference form (which does not use surface fluxes) is
	931	!-- applied
	932	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	933	nzb_diff_u = nzb_u_inner + 2
	934	nzb_diff_v = nzb_v_inner + 2
	935	nzb_diff_s_inner = nzb_s_inner + 2
	936	nzb_diff_s_outer = nzb_s_outer + 2
	937	ELSE
	938	nzb_diff_u = nzb_u_inner + 1
	939	nzb_diff_v = nzb_v_inner + 1
	940	nzb_diff_s_inner = nzb_s_inner + 1
	941	nzb_diff_s_outer = nzb_s_outer + 1
	942	ENDIF
	943
	944	!
	945	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	946	!-- for limitation of near-wall mixing length l_wall further below
	947	corner_nl = 0
	948	corner_nr = 0
	949	corner_sl = 0
	950	corner_sr = 0
	951	wall_l = 0
	952	wall_n = 0
	953	wall_r = 0
	954	wall_s = 0
	955
	956	DO i = nxl, nxr
	957	DO j = nys, nyn
	958	!
	959	!-- u-component
	960	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	961	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	962	fym(j,i) = 0.0_wp
	963	fyp(j,i) = 1.0_wp
[1]	964	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	965	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	966	fym(j,i) = 1.0_wp
	967	fyp(j,i) = 0.0_wp
[1]	968	ENDIF
	969	!
	970	!-- v-component
	971	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	972	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	973	fxm(j,i) = 0.0_wp
	974	fxp(j,i) = 1.0_wp
[1]	975	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	976	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	977	fxm(j,i) = 1.0_wp
	978	fxp(j,i) = 0.0_wp
[1]	979	ENDIF
	980	!
	981	!-- w-component, also used for scalars, separate arrays for shear
	982	!-- production of tke
	983	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	984	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	985	wall_w_y(j,i) = 1.0_wp
	986	fwym(j,i) = 0.0_wp
	987	fwyp(j,i) = 1.0_wp
[1]	988	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	989	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	990	wall_w_y(j,i) = 1.0_wp
	991	fwym(j,i) = 1.0_wp
	992	fwyp(j,i) = 0.0_wp
[1]	993	ENDIF
	994	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	995	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	996	wall_w_x(j,i) = 1.0_wp
	997	fwxm(j,i) = 0.0_wp
	998	fwxp(j,i) = 1.0_wp
[1]	999	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1000	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1001	wall_w_x(j,i) = 1.0_wp
	1002	fwxm(j,i) = 1.0_wp
	1003	fwxp(j,i) = 0.0_wp
[1]	1004	ENDIF
	1005	!
	1006	!-- Wall and corner locations inside buildings for limitation of
	1007	!-- near-wall mixing length l_wall
	1008	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1009
	1010	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1011
	1012	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1013	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1014	nzb_s_inner(j,i-1) ) + 1
	1015	ENDIF
	1016
	1017	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1018	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1019	nzb_s_inner(j,i+1) ) + 1
	1020	ENDIF
	1021
	1022	ENDIF
	1023
	1024	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1025
	1026	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1027	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1028	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1029	nzb_s_inner(j,i-1) ) + 1
	1030	ENDIF
	1031
	1032	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1033	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1034	nzb_s_inner(j,i+1) ) + 1
	1035	ENDIF
	1036
	1037	ENDIF
	1038
	1039	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1040	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1041	ENDIF
	1042
	1043	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1044	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1045	ENDIF
	1046
	1047	ENDDO
	1048	ENDDO
	1049
	1050	!
[114]	1051	!-- Calculate wall flag arrays for the multigrid method
[1575]	1052	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1053	!
	1054	!-- Gridpoint increment of the current level
	1055	inc = 1
	1056
	1057	DO l = maximum_grid_level, 1 , -1
	1058
	1059	nxl_l = nxl_mg(l)
	1060	nxr_l = nxr_mg(l)
	1061	nys_l = nys_mg(l)
	1062	nyn_l = nyn_mg(l)
	1063	nzt_l = nzt_mg(l)
	1064
	1065	!
	1066	!-- Assign the flag level to be calculated
	1067	SELECT CASE ( l )
	1068	CASE ( 1 )
	1069	flags => wall_flags_1
	1070	CASE ( 2 )
	1071	flags => wall_flags_2
	1072	CASE ( 3 )
	1073	flags => wall_flags_3
	1074	CASE ( 4 )
	1075	flags => wall_flags_4
	1076	CASE ( 5 )
	1077	flags => wall_flags_5
	1078	CASE ( 6 )
	1079	flags => wall_flags_6
	1080	CASE ( 7 )
	1081	flags => wall_flags_7
	1082	CASE ( 8 )
	1083	flags => wall_flags_8
	1084	CASE ( 9 )
	1085	flags => wall_flags_9
	1086	CASE ( 10 )
	1087	flags => wall_flags_10
	1088	END SELECT
	1089
	1090	!
	1091	!-- Depending on the grid level, set the respective bits in case of
	1092	!-- neighbouring walls
	1093	!-- Bit 0: wall to the bottom
	1094	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1095	!-- Bit 2: wall to the south
	1096	!-- Bit 3: wall to the north
	1097	!-- Bit 4: wall to the left
	1098	!-- Bit 5: wall to the right
[116]	1099	!-- Bit 6: inside building
[114]	1100
	1101	flags = 0
	1102
[927]	1103	!
	1104	!-- In case of masking method, flags are not set and multigrid method
	1105	!-- works like FFT-solver
	1106	IF ( .NOT. masking_method ) THEN
	1107
	1108	DO i = nxl_l-1, nxr_l+1
	1109	DO j = nys_l-1, nyn_l+1
	1110	DO k = nzb, nzt_l+1
[114]	1111
	1112	!
[927]	1113	!-- Inside/outside building (inside building does not need
	1114	!-- further tests for walls)
	1115	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1116
[927]	1117	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1118
[927]	1119	ELSE
[114]	1120	!
[927]	1121	!-- Bottom wall
	1122	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1123	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1124	ENDIF
[114]	1125	!
[927]	1126	!-- South wall
	1127	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1128	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1129	ENDIF
[114]	1130	!
[927]	1131	!-- North wall
	1132	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1133	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1134	ENDIF
[114]	1135	!
[927]	1136	!-- Left wall
	1137	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1138	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1139	ENDIF
[114]	1140	!
[927]	1141	!-- Right wall
	1142	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1143	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1144	ENDIF
	1145
[114]	1146	ENDIF
	1147
[927]	1148	ENDDO
[114]	1149	ENDDO
	1150	ENDDO
	1151
[927]	1152	ENDIF
	1153
[114]	1154	!
	1155	!-- Test output of flag arrays
[145]	1156	! i = nxl_l
	1157	! WRITE (9,*) ' '
	1158	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1159	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1160	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1161	! DO k = nzt_l+1, nzb, -1
	1162	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1163	! ENDDO
[114]	1164
	1165	inc = inc * 2
	1166
	1167	ENDDO
	1168
	1169	ENDIF
[861]	1170	!
	1171	!-- Allocate flags needed for masking walls.
[1221]	1172	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr), &
	1173	wall_flags_00(nzb:nzt,nys:nyn,nxl:nxr) )
	1174	wall_flags_0 = 0
	1175	wall_flags_00 = 0
[114]	1176
[1557]	1177	IF ( scalar_advec == 'ws-scheme' .OR. &
	1178	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1179	!
[861]	1180	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1181	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1182	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1183	!-- grid points.
	1184	DO i = nxl, nxr
	1185	DO j = nys, nyn
	1186	DO k = nzb_s_inner(j,i)+1, nzt
	1187	!
	1188	!-- scalar - x-direction
	1189	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1190	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1191	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1192	.AND. i == nxr ) ) THEN
[861]	1193	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1194	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1195	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1196	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1197	) THEN
[861]	1198	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1199	ELSE
	1200	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1201	ENDIF
	1202	!
	1203	!-- scalar - y-direction
	1204	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1205	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1206	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1207	.AND. j == nyn ) ) THEN
[861]	1208	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1209	!-- WS3
	1210	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1211	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1212	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1213	) THEN
[861]	1214	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1215	!-- WS5
	1216	ELSE
	1217	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1218	ENDIF
	1219	!
	1220	!-- scalar - z-direction
	1221	!-- WS1 (6), WS3 (7), WS5 (8)
	1222	flag_set = .FALSE.
	1223	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1224	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1225	flag_set = .TRUE.
	1226	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1227	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1228	flag_set = .TRUE.
	1229	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1230	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1231	ENDIF
	1232	ENDDO
	1233	ENDDO
	1234	ENDDO
	1235	ENDIF
	1236
	1237	IF ( momentum_advec == 'ws-scheme' ) THEN
	1238	!
	1239	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1240	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1241	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1242	!-- grid points.
	1243	DO i = nxl, nxr
	1244	DO j = nys, nyn
[1580]	1245	DO k = nzb+1, nzt
[861]	1246	!
[1580]	1247	!-- At first, set flags to WS1.
	1248	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1249	!-- in order to handle the left/south flux.
	1250	!-- near vertical walls.
	1251	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1252	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1253	!
[861]	1254	!-- u component - x-direction
	1255	!-- WS1 (9), WS3 (10), WS5 (11)
	1256	IF ( k <= nzb_u_inner(j,i+1) &
[1409]	1257	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
[978]	1258	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1259	) THEN
[1580]	1260	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[861]	1261	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1262	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1263	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1264	) THEN
[861]	1265	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1266	!
	1267	!-- Clear flag for WS1
	1268	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1269	ELSE
	1270	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1271	!
	1272	!-- Clear flag for WS1
	1273	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1274	ENDIF
	1275	!
	1276	!-- u component - y-direction
	1277	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1278	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1279	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1280	.AND. j == nyn ) ) THEN
[1580]	1281	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1282	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1283	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1284	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1285	) THEN
[861]	1286	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1287	!
	1288	!-- Clear flag for WS1
	1289	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1290	ELSE
	1291	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1292	!
	1293	!-- Clear flag for WS1
	1294	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1295	ENDIF
	1296	!
	1297	!-- u component - z-direction
	1298	!-- WS1 (15), WS3 (16), WS5 (17)
	1299	flag_set = .FALSE.
	1300	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1301	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1302	flag_set = .TRUE.
	1303	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1304	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1305	flag_set = .TRUE.
	1306	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1307	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1308	ENDIF
	1309
	1310	ENDDO
	1311	ENDDO
	1312	ENDDO
	1313
	1314	DO i = nxl, nxr
	1315	DO j = nys, nyn
[1580]	1316	DO k = nzb+1, nzt
[861]	1317	!
[1580]	1318	!-- At first, set flags to WS1.
	1319	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1320	!-- in order to handle the left/south flux.
	1321	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1322	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1323	!
[861]	1324	!-- v component - x-direction
	1325	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1326	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1327	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1328	.AND. i == nxr ) ) THEN
[1580]	1329	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
[861]	1330	!-- WS3
	1331	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1332	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1333	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1334	) THEN
[861]	1335	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1336	!
	1337	!-- Clear flag for WS1
	1338	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1339	ELSE
	1340	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1341	!
	1342	!-- Clear flag for WS1
	1343	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1344	ENDIF
	1345	!
	1346	!-- v component - y-direction
	1347	!-- WS1 (21), WS3 (22), WS5 (23)
	1348	IF ( k <= nzb_v_inner(j+1,i) &
[1409]	1349	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
[978]	1350	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1351	) THEN
[1580]	1352	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1353	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1354	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1355	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1356	) THEN
[861]	1357	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1358	!
	1359	!-- Clear flag for WS1
	1360	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1361	ELSE
	1362	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1363	!
	1364	!-- Clear flag for WS1
	1365	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1366	ENDIF
	1367	!
	1368	!-- v component - z-direction
	1369	!-- WS1 (24), WS3 (25), WS5 (26)
	1370	flag_set = .FALSE.
	1371	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1372	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1373	flag_set = .TRUE.
	1374	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1375	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1376	flag_set = .TRUE.
	1377	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1378	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1379	ENDIF
	1380
	1381	ENDDO
	1382	ENDDO
	1383	ENDDO
	1384	DO i = nxl, nxr
	1385	DO j = nys, nyn
[1580]	1386	DO k = nzb+1, nzt
[861]	1387	!
[1580]	1388	!-- At first, set flags to WS1.
	1389	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1390	!-- in order to handle the left/south flux.
	1391	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1392	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1393	!
[861]	1394	!-- w component - x-direction
	1395	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1396	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1397	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1398	.AND. i == nxr ) ) THEN
[1580]	1399	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1400	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1401	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1402	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1403	) THEN
[861]	1404	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1405	!
	1406	!-- Clear flag for WS1
	1407	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1408	ELSE
	1409	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1410	!
	1411	!-- Clear flag for WS1
	1412	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1413	ENDIF
	1414	!
	1415	!-- w component - y-direction
	1416	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1417	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1418	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1419	.AND. j == nyn ) ) THEN
[1580]	1420	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1421	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1422	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1423	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1424	) THEN
[861]	1425	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1426	!
	1427	!-- Clear flag for WS1
	1428	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1429	ELSE
[1221]	1430	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1431	!
	1432	!-- Clear flag for WS1
	1433	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1434	ENDIF
	1435	!
	1436	!-- w component - z-direction
	1437	!-- WS1 (33), WS3 (34), WS5 (35)
	1438	flag_set = .FALSE.
	1439	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1440	.OR. k == nzt ) THEN
	1441	!
	1442	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1443	!-- set, although this is not a prognostic level. However,
	1444	!-- contrary to the advection of u,v and s this is necessary
	1445	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1446	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1447	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1448	flag_set = .TRUE.
	1449	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1450	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1451	flag_set = .TRUE.
	1452	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1453	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1454	ENDIF
	1455
	1456	ENDDO
	1457	ENDDO
	1458	ENDDO
	1459
	1460	ENDIF
	1461
	1462	!
[1]	1463	!-- In case of topography: limit near-wall mixing length l_wall further:
	1464	!-- Go through all points of the subdomain one by one and look for the closest
	1465	!-- surface
	1466	IF ( TRIM(topography) /= 'flat' ) THEN
	1467	DO i = nxl, nxr
	1468	DO j = nys, nyn
	1469
	1470	nzb_si = nzb_s_inner(j,i)
	1471	vi = vertical_influence(nzb_si)
	1472
	1473	IF ( wall_n(j,i) > 0 ) THEN
	1474	!
	1475	!-- North wall (y distance)
	1476	DO k = wall_n(j,i), nzb_si
[1353]	1477	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1478	ENDDO
	1479	!
	1480	!-- Above North wall (yz distance)
	1481	DO k = nzb_si + 1, nzb_si + vi
[1353]	1482	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1483	SQRT( 0.25_wp * dy**2 + &
[1]	1484	( zu(k) - zw(nzb_si) )**2 ) )
	1485	ENDDO
	1486	!
	1487	!-- Northleft corner (xy distance)
	1488	IF ( corner_nl(j,i) > 0 ) THEN
	1489	DO k = corner_nl(j,i), nzb_si
	1490	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1491	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1492	ENDDO
	1493	!
	1494	!-- Above Northleft corner (xyz distance)
	1495	DO k = nzb_si + 1, nzb_si + vi
[1353]	1496	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1497	SQRT( 0.25_wp * (dx2 + dy2) + &
	1498	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1499	ENDDO
	1500	ENDIF
	1501	!
	1502	!-- Northright corner (xy distance)
	1503	IF ( corner_nr(j,i) > 0 ) THEN
	1504	DO k = corner_nr(j,i), nzb_si
[1353]	1505	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1506	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1507	ENDDO
	1508	!
	1509	!-- Above northright corner (xyz distance)
	1510	DO k = nzb_si + 1, nzb_si + vi
[1353]	1511	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1512	SQRT( 0.25_wp * (dx2 + dy2) + &
	1513	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1514	ENDDO
	1515	ENDIF
	1516	ENDIF
	1517
	1518	IF ( wall_s(j,i) > 0 ) THEN
	1519	!
	1520	!-- South wall (y distance)
	1521	DO k = wall_s(j,i), nzb_si
[1353]	1522	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1523	ENDDO
	1524	!
	1525	!-- Above south wall (yz distance)
[1353]	1526	DO k = nzb_si + 1, nzb_si + vi
	1527	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1528	SQRT( 0.25_wp * dy**2 + &
[1]	1529	( zu(k) - zw(nzb_si) )**2 ) )
	1530	ENDDO
	1531	!
	1532	!-- Southleft corner (xy distance)
	1533	IF ( corner_sl(j,i) > 0 ) THEN
	1534	DO k = corner_sl(j,i), nzb_si
[1353]	1535	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1536	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1537	ENDDO
	1538	!
	1539	!-- Above southleft corner (xyz distance)
	1540	DO k = nzb_si + 1, nzb_si + vi
[1353]	1541	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1542	SQRT( 0.25_wp * (dx2 + dy2) + &
	1543	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1544	ENDDO
	1545	ENDIF
	1546	!
	1547	!-- Southright corner (xy distance)
	1548	IF ( corner_sr(j,i) > 0 ) THEN
	1549	DO k = corner_sr(j,i), nzb_si
[1353]	1550	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1551	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1552	ENDDO
	1553	!
	1554	!-- Above southright corner (xyz distance)
	1555	DO k = nzb_si + 1, nzb_si + vi
[1353]	1556	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1557	SQRT( 0.25_wp * (dx2 + dy2) + &
	1558	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1559	ENDDO
	1560	ENDIF
	1561
	1562	ENDIF
	1563
	1564	IF ( wall_l(j,i) > 0 ) THEN
	1565	!
	1566	!-- Left wall (x distance)
	1567	DO k = wall_l(j,i), nzb_si
[1353]	1568	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1569	ENDDO
	1570	!
	1571	!-- Above left wall (xz distance)
	1572	DO k = nzb_si + 1, nzb_si + vi
[1353]	1573	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1574	SQRT( 0.25_wp * dx**2 + &
	1575	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1576	ENDDO
	1577	ENDIF
	1578
	1579	IF ( wall_r(j,i) > 0 ) THEN
	1580	!
	1581	!-- Right wall (x distance)
	1582	DO k = wall_r(j,i), nzb_si
[1353]	1583	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1584	ENDDO
	1585	!
	1586	!-- Above right wall (xz distance)
	1587	DO k = nzb_si + 1, nzb_si + vi
[1353]	1588	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1589	SQRT( 0.25_wp * dx**2 + &
[1]	1590	( zu(k) - zw(nzb_si) )**2 ) )
	1591	ENDDO
	1592
	1593	ENDIF
	1594
	1595	ENDDO
	1596	ENDDO
	1597
	1598	ENDIF
	1599
	1600	!
	1601	!-- Multiplication with wall_adjustment_factor
	1602	l_wall = wall_adjustment_factor * l_wall
	1603
	1604	!
[709]	1605	!-- Set lateral boundary conditions for l_wall
[667]	1606	CALL exchange_horiz( l_wall, nbgp )
	1607
[1]	1608	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1609	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1610
[807]	1611	#endif
[1]	1612
	1613	END SUBROUTINE init_grid

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