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source: palm/trunk/SOURCE/init_grid.f90 @ 1634

Last change on this file since 1634 was 1581, checked in by suehring, 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	! -----------------
[1581]	22	!
[1576]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1581 2015-04-10 13:45:59Z hoffmann $
	27	!
[1581]	28	! 1580 2015-04-10 13:43:49Z suehring
	29	! Bugfix: setting flags for 5th order scheme near buildings
	30	!
[1576]	31	! 1575 2015-03-27 09:56:27Z raasch
	32	! adjustments for psolver-queries
	33	!
[1558]	34	! 1557 2015-03-05 16:43:04Z suehring
	35	! Adjustment for monotoinic limiter
	36	!
[1419]	37	! 1418 2014-06-06 13:05:08Z fricke
	38	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	39	! condition and a negative value for dz_stretch_level the condition
	40	! was always true for the whole model domain
	41	!
[1410]	42	! 1409 2014-05-23 12:11:32Z suehring
	43	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	44	! j <= nysv
	45	!
[1354]	46	! 1353 2014-04-08 15:21:23Z heinze
	47	! REAL constants provided with KIND-attribute
	48	!
[1323]	49	! 1322 2014-03-20 16:38:49Z raasch
	50	! REAL constants defined as wp-kind
	51	!
[1321]	52	! 1320 2014-03-20 08:40:49Z raasch
[1320]	53	! ONLY-attribute added to USE-statements,
	54	! kind-parameters added to all INTEGER and REAL declaration statements,
	55	! kinds are defined in new module kinds,
	56	! revision history before 2012 removed,
	57	! comment fields (!:) to be used for variable explanations added to
	58	! all variable declaration statements
[1321]	59	!
[1222]	60	! 1221 2013-09-10 08:59:13Z raasch
	61	! wall_flags_00 introduced to hold bits 32-63,
	62	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	63	! loops optimized for openACC (pres + flow_statistics)
	64	!
[1093]	65	! 1092 2013-02-02 11:24:22Z raasch
	66	! unused variables removed
	67	!
[1070]	68	! 1069 2012-11-28 16:18:43Z maronga
	69	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	70	! model in case of coupled runs
	71	!
[1037]	72	! 1036 2012-10-22 13:43:42Z raasch
	73	! code put under GPL (PALM 3.9)
	74	!
[1017]	75	! 1015 2012-09-27 09:23:24Z raasch
	76	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	77	! nzb_w_inner+1
	78	!
[997]	79	! 996 2012-09-07 10:41:47Z raasch
	80	! little reformatting
	81	!
[979]	82	! 978 2012-08-09 08:28:32Z fricke
	83	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	84	! Bugfix: Set wall_flags_0 for inflow boundary
	85	!
[928]	86	! 927 2012-06-06 19:15:04Z raasch
	87	! Wall flags are not set for multigrid method in case of masking method
	88	!
[865]	89	! 864 2012-03-27 15:10:33Z gryschka
[927]	90	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	91	! were not correctly defined for k=1.
[865]	92	!
[863]	93	! 861 2012-03-26 14:18:34Z suehring
[861]	94	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	95	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	96	! model domain.!
[861]	97	! Initialization of nzb_s_inner and nzb_w_inner.
	98	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	99	! while setting wall_flags_0
	100	!
[844]	101	! 843 2012-02-29 15:16:21Z gryschka
	102	! In case of ocean and dirichlet bc for u and v at the bottom
	103	! the first u-level ist defined at same height as the first w-level
	104	!
[819]	105	! 818 2012-02-08 16:11:23Z maronga
	106	! Bugfix: topo_height is only required if topography is used. It is thus now
	107	! allocated in the topography branch
	108	!
[810]	109	! 809 2012-01-30 13:32:58Z maronga
	110	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	111	!
[808]	112	! 807 2012-01-25 11:53:51Z maronga
	113	! New cpp directive "__check" implemented which is used by check_namelist_files
	114	!
[1]	115	! Revision 1.1 1997/08/11 06:17:45 raasch
	116	! Initial revision (Testversion)
	117	!
	118	!
	119	! Description:
	120	! ------------
	121	! Creating grid depending constants
	122	!------------------------------------------------------------------------------!
	123
[1320]	124	USE arrays_3d, &
	125	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	126	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	127
[1353]	128	USE control_parameters, &
[1320]	129	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	130	building_length_y, building_wall_left, building_wall_south, &
	131	canyon_height, canyon_wall_left, canyon_wall_south, &
	132	canyon_width_x, canyon_width_y, coupling_char, dp_level_ind_b, &
	133	dz, dz_max, dz_stretch_factor, dz_stretch_level, &
	134	dz_stretch_level_index, ibc_uv_b, io_blocks, io_group, &
	135	inflow_l, inflow_n, inflow_r, inflow_s, masking_method, &
	136	maximum_grid_level, message_string, momentum_advec, ocean, &
	137	outflow_l, outflow_n, outflow_r, outflow_s, prandtl_layer, &
	138	psolver, scalar_advec, topography, topography_grid_convention, &
	139	use_surface_fluxes, use_top_fluxes, wall_adjustment_factor
	140
	141	USE grid_variables, &
	142	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	143	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	144	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	145
	146	USE indices, &
	147	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	148	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	149	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	150	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	151	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	152	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	153	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	154	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	155	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	156	wall_flags_9
	157
	158	USE kinds
	159
[1]	160	USE pegrid
	161
	162	IMPLICIT NONE
	163
[1320]	164	INTEGER(iwp) :: bh !:
	165	INTEGER(iwp) :: blx !:
	166	INTEGER(iwp) :: bly !:
	167	INTEGER(iwp) :: bxl !:
	168	INTEGER(iwp) :: bxr !:
	169	INTEGER(iwp) :: byn !:
	170	INTEGER(iwp) :: bys !:
	171	INTEGER(iwp) :: ch !:
	172	INTEGER(iwp) :: cwx !:
	173	INTEGER(iwp) :: cwy !:
	174	INTEGER(iwp) :: cxl !:
	175	INTEGER(iwp) :: cxr !:
	176	INTEGER(iwp) :: cyn !:
	177	INTEGER(iwp) :: cys !:
	178	INTEGER(iwp) :: gls !:
	179	INTEGER(iwp) :: i !:
	180	INTEGER(iwp) :: ii !:
	181	INTEGER(iwp) :: inc !:
	182	INTEGER(iwp) :: j !:
	183	INTEGER(iwp) :: k !:
	184	INTEGER(iwp) :: l !:
	185	INTEGER(iwp) :: nxl_l !:
	186	INTEGER(iwp) :: nxr_l !:
	187	INTEGER(iwp) :: nyn_l !:
	188	INTEGER(iwp) :: nys_l !:
	189	INTEGER(iwp) :: nzb_si !:
	190	INTEGER(iwp) :: nzt_l !:
	191	INTEGER(iwp) :: vi !:
[1]	192
[1320]	193	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !:
[1]	194
[1320]	195	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !:
	196	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !:
	197	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !:
	198	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !:
	199	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !:
	200	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !:
	201	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !:
	202	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !:
	203	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !:
	204	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !:
[1]	205
[1320]	206	LOGICAL :: flag_set = .FALSE. !:
[861]	207
[1320]	208	REAL(wp) :: dx_l !:
	209	REAL(wp) :: dy_l !:
	210	REAL(wp) :: dz_stretched !:
[1]	211
[1320]	212	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !:
[1]	213
[667]	214
[1]	215	!
[709]	216	!-- Calculation of horizontal array bounds including ghost layers
[667]	217	nxlg = nxl - nbgp
	218	nxrg = nxr + nbgp
	219	nysg = nys - nbgp
	220	nyng = nyn + nbgp
[709]	221
[667]	222	!
[1]	223	!-- Allocate grid arrays
[1353]	224	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	225	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	226
	227	!
	228	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	229	IF ( dz == -1.0_wp ) THEN
[254]	230	message_string = 'missing dz'
	231	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	232	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	233	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	234	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	235	ENDIF
[94]	236
[1]	237	!
[94]	238	!-- Define the vertical grid levels
	239	IF ( .NOT. ocean ) THEN
	240	!
	241	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	242	!-- The second u-level (k=1) corresponds to the top of the
[94]	243	!-- Prandtl-layer.
[667]	244
	245	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	246	zu(0) = 0.0_wp
	247	! zu(0) = - dz * 0.5_wp
[667]	248	ELSE
[1353]	249	zu(0) = - dz * 0.5_wp
[667]	250	ENDIF
[1353]	251	zu(1) = dz * 0.5_wp
[1]	252
[94]	253	dz_stretch_level_index = nzt+1
	254	dz_stretched = dz
	255	DO k = 2, nzt+1
	256	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	257	dz_stretched = dz_stretched * dz_stretch_factor
	258	dz_stretched = MIN( dz_stretched, dz_max )
	259	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	260	ENDIF
	261	zu(k) = zu(k-1) + dz_stretched
	262	ENDDO
[1]	263
	264	!
[94]	265	!-- Compute the w-levels. They are always staggered half-way between the
[843]	266	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	267	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	268	!-- The top w-level is extrapolated linearly.
[1353]	269	zw(0) = 0.0_wp
[94]	270	DO k = 1, nzt
[1353]	271	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	272	ENDDO
[1353]	273	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	274
[94]	275	ELSE
[1]	276	!
[843]	277	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	278	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	279	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	280	!-- w-level are defined at same height, but staggered from the second level.
	281	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	282	zu(nzt+1) = dz * 0.5_wp
	283	zu(nzt) = - dz * 0.5_wp
[94]	284
	285	dz_stretch_level_index = 0
	286	dz_stretched = dz
	287	DO k = nzt-1, 0, -1
[1418]	288	!
	289	!-- The default value of dz_stretch_level is positive, thus the first
	290	!-- condition is always true. Hence, the second condition is necessary.
	291	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	292	.AND. dz_stretched < dz_max ) THEN
[94]	293	dz_stretched = dz_stretched * dz_stretch_factor
	294	dz_stretched = MIN( dz_stretched, dz_max )
	295	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	296	ENDIF
	297	zu(k) = zu(k+1) - dz_stretched
	298	ENDDO
	299
	300	!
	301	!-- Compute the w-levels. They are always staggered half-way between the
[843]	302	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	303	!-- at the ground. In this case the first u- and w-level are defined at
	304	!-- same height. The top w-level (nzt+1) is not used but set for
	305	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	306	zw(nzt+1) = dz
[1353]	307	zw(nzt) = 0.0_wp
[94]	308	DO k = 0, nzt
[1353]	309	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	310	ENDDO
	311
[843]	312	!
	313	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	314	!-- at same height.
	315	IF ( ibc_uv_b == 0 ) THEN
	316	zu(0) = zw(0)
	317	ENDIF
	318
[94]	319	ENDIF
	320
	321	!
[1]	322	!-- Compute grid lengths.
	323	DO k = 1, nzt+1
	324	dzu(k) = zu(k) - zu(k-1)
[1353]	325	ddzu(k) = 1.0_wp / dzu(k)
[1]	326	dzw(k) = zw(k) - zw(k-1)
[1353]	327	ddzw(k) = 1.0_wp / dzw(k)
[1]	328	ENDDO
	329
	330	DO k = 1, nzt
[1353]	331	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	332	ENDDO
[667]	333
	334	!
[709]	335	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	336	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	337	!-- is only dz/2, but should be dz. Therefore, an additional array
	338	!-- containing with appropriate grid information is created for these
	339	!-- solvers.
[1575]	340	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	341	ALLOCATE( ddzu_pres(1:nzt+1) )
	342	ddzu_pres = ddzu
[864]	343	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	344	ENDIF
[1]	345
	346	!
	347	!-- In case of multigrid method, compute grid lengths and grid factors for the
	348	!-- grid levels
[1575]	349	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	350
	351	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	352	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	353	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	354	f1_mg(nzb+1:nzt,maximum_grid_level), &
	355	f2_mg(nzb+1:nzt,maximum_grid_level), &
	356	f3_mg(nzb+1:nzt,maximum_grid_level) )
	357
	358	dzu_mg(:,maximum_grid_level) = dzu
[667]	359	!
[864]	360	!-- Next line to ensure an equally spaced grid.
	361	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	362
[1]	363	dzw_mg(:,maximum_grid_level) = dzw
	364	nzt_l = nzt
	365	DO l = maximum_grid_level-1, 1, -1
[1353]	366	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	367	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	368	nzt_l = nzt_l / 2
	369	DO k = 2, nzt_l+1
	370	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	371	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	372	ENDDO
	373	ENDDO
	374
	375	nzt_l = nzt
	376	dx_l = dx
	377	dy_l = dy
	378	DO l = maximum_grid_level, 1, -1
[1353]	379	ddx2_mg(l) = 1.0_wp / dx_l**2
	380	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	381	DO k = nzb+1, nzt_l
[1353]	382	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	383	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	384	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	385	f2_mg(k,l) + f3_mg(k,l)
	386	ENDDO
	387	nzt_l = nzt_l / 2
[1353]	388	dx_l = dx_l * 2.0_wp
	389	dy_l = dy_l * 2.0_wp
[1]	390	ENDDO
	391
	392	ENDIF
	393
	394	!
	395	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	396	ddx = 1.0_wp / dx
	397	ddy = 1.0_wp / dy
[1]	398	dx2 = dx * dx
	399	dy2 = dy * dy
[1353]	400	ddx2 = 1.0_wp / dx2
	401	ddy2 = 1.0_wp / dy2
[1]	402
	403	!
	404	!-- Compute the grid-dependent mixing length.
	405	DO k = 1, nzt
[1322]	406	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	407	ENDDO
	408
	409	!
	410	!-- Allocate outer and inner index arrays for topography and set
[114]	411	!-- defaults.
	412	!-- nzb_local has to contain additional layers of ghost points for calculating
	413	!-- the flag arrays needed for the multigrid method
	414	gls = 2**( maximum_grid_level )
[861]	415	IF ( gls < nbgp ) gls = nbgp
[667]	416
[114]	417	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	418	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	419	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	420	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	421	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	422	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	423	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	424	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	425	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	426	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	427	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	428	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	429	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	430	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	431	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	432	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	433	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	434	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	435	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	436	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	437	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	438	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	439	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	440	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	441	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	442	wall_e_x(nysg:nyng,nxlg:nxrg), &
	443	wall_e_y(nysg:nyng,nxlg:nxrg), &
	444	wall_u(nysg:nyng,nxlg:nxrg), &
	445	wall_v(nysg:nyng,nxlg:nxrg), &
	446	wall_w_x(nysg:nyng,nxlg:nxrg), &
	447	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	448
	449
[667]	450
	451	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	452
[818]	453
[1]	454	nzb_s_inner = nzb; nzb_s_outer = nzb
	455	nzb_u_inner = nzb; nzb_u_outer = nzb
	456	nzb_v_inner = nzb; nzb_v_outer = nzb
	457	nzb_w_inner = nzb; nzb_w_outer = nzb
	458
[1353]	459	rflags_s_inner = 1.0_wp
	460	rflags_invers = 1.0_wp
[1221]	461
[1]	462	!
[19]	463	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	464	!-- form (which does not use surface fluxes) is applied
	465	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	466	nzb_diff = nzb + 2
	467	ELSE
	468	nzb_diff = nzb + 1
	469	ENDIF
[19]	470	IF ( use_top_fluxes ) THEN
	471	nzt_diff = nzt - 1
	472	ELSE
	473	nzt_diff = nzt
	474	ENDIF
[1]	475
	476	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	477	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	478
[1353]	479	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	480	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	481	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	482	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	483
	484	!
	485	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	486	!-- for the moment,
	487	!-- multiplication with wall_adjustment_factor near the end of this routine
	488	l_wall(nzb,:,:) = l_grid(1)
	489	DO k = nzb+1, nzt
	490	l_wall(k,:,:) = l_grid(k)
	491	ENDDO
	492	l_wall(nzt+1,:,:) = l_grid(nzt)
	493
	494	ALLOCATE ( vertical_influence(nzb:nzt) )
	495	DO k = 1, nzt
	496	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	497	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	498	ENDDO
	499
	500	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	501	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	502	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	503	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	504	'threshold given by only local', &
	505	' &horizontal reduction of near_wall ', &
	506	'mixing length l_wall', &
	507	' &starting from height level k = ', k, '.'
	508	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	509	EXIT
	510	ENDIF
	511	ENDDO
	512	vertical_influence(0) = vertical_influence(1)
	513
[667]	514	DO i = nxlg, nxrg
	515	DO j = nysg, nyng
[1]	516	DO k = nzb_s_inner(j,i) + 1, &
	517	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	518	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	519	ENDDO
	520	ENDDO
	521	ENDDO
	522
	523	!
	524	!-- Set outer and inner index arrays for non-flat topography.
	525	!-- Here consistency checks concerning domain size and periodicity are
	526	!-- necessary.
	527	!-- Within this SELECT CASE structure only nzb_local is initialized
	528	!-- individually depending on the chosen topography type, all other index
	529	!-- arrays are initialized further below.
	530	SELECT CASE ( TRIM( topography ) )
	531
	532	CASE ( 'flat' )
	533	!
[555]	534	!-- nzb_local is required for the multigrid solver
	535	nzb_local = 0
[1]	536
	537	CASE ( 'single_building' )
	538	!
	539	!-- Single rectangular building, by default centered in the middle of the
	540	!-- total domain
	541	blx = NINT( building_length_x / dx )
	542	bly = NINT( building_length_y / dy )
	543	bh = NINT( building_height / dz )
	544
[1322]	545	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	546	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	547	ENDIF
	548	bxl = NINT( building_wall_left / dx )
	549	bxr = bxl + blx
	550
[1322]	551	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	552	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	553	ENDIF
	554	bys = NINT( building_wall_south / dy )
	555	byn = bys + bly
	556
	557	!
	558	!-- Building size has to meet some requirements
	559	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	560	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	561	WRITE( message_string, * ) 'inconsistent building parameters:', &
	562	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	563	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	564	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	565	ENDIF
	566
	567	!
[217]	568	!-- Define the building.
[1]	569	nzb_local = 0
[134]	570	nzb_local(bys:byn,bxl:bxr) = bh
[1]	571
[240]	572	CASE ( 'single_street_canyon' )
	573	!
	574	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	575	!-- The canyon is centered in the other direction by default.
[1322]	576	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	577	!
	578	!-- Street canyon in y direction
	579	cwx = NINT( canyon_width_x / dx )
[1322]	580	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	581	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	582	ENDIF
	583	cxl = NINT( canyon_wall_left / dx )
	584	cxr = cxl + cwx
	585
[1322]	586	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	587	!
	588	!-- Street canyon in x direction
	589	cwy = NINT( canyon_width_y / dy )
[1322]	590	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	591	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	592	ENDIF
	593	cys = NINT( canyon_wall_south / dy )
	594	cyn = cys + cwy
	595
	596	ELSE
[254]	597
	598	message_string = 'no street canyon width given'
	599	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	600
[240]	601	ENDIF
	602
	603	ch = NINT( canyon_height / dz )
	604	dp_level_ind_b = ch
	605	!
	606	!-- Street canyon size has to meet some requirements
[1322]	607	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	608	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	609	( ch < 3 ) ) THEN
[1353]	610	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	611	'&cxl=', cxl, 'cxr=', cxr, &
	612	'cwx=', cwx, &
[254]	613	'ch=', ch, 'nx=', nx, 'ny=', ny
	614	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	615	ENDIF
[1322]	616	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	617	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	618	( ch < 3 ) ) THEN
[1353]	619	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	620	'&cys=', cys, 'cyn=', cyn, &
	621	'cwy=', cwy, &
[254]	622	'ch=', ch, 'nx=', nx, 'ny=', ny
	623	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	624	ENDIF
	625	ENDIF
[1353]	626	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	627	canyon_width_y /= 9999999.9_wp ) THEN
	628	message_string = 'inconsistent canyon parameters:' // &
	629	'&street canyon can only be oriented' // &
[254]	630	'&either in x- or in y-direction'
	631	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	632	ENDIF
	633
	634	nzb_local = ch
[1322]	635	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	636	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	637	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	638	nzb_local(cys+1:cyn-1,:) = 0
	639	ENDIF
	640
[1]	641	CASE ( 'read_from_file' )
[759]	642
[818]	643	ALLOCATE ( topo_height(0:ny,0:nx) )
	644
[759]	645	DO ii = 0, io_blocks-1
	646	IF ( ii == io_group ) THEN
	647
[1]	648	!
[759]	649	!-- Arbitrary irregular topography data in PALM format (exactly
	650	!-- matching the grid size and total domain size)
[1069]	651	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	652	FORM='FORMATTED', ERR=10 )
	653	DO j = ny, 0, -1
	654	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	655	ENDDO
	656
	657	GOTO 12
	658
[1069]	659	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	660	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	661
[1069]	662	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	663	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	664
	665	12 CLOSE( 90 )
	666
	667	ENDIF
[809]	668	#if defined( __parallel ) && ! defined ( __check )
[759]	669	CALL MPI_BARRIER( comm2d, ierr )
	670	#endif
[559]	671	ENDDO
[759]	672
[1]	673	!
	674	!-- Calculate the index height of the topography
	675	DO i = 0, nx
	676	DO j = 0, ny
	677	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	678	ENDDO
	679	ENDDO
[818]	680
	681	DEALLOCATE ( topo_height )
[114]	682	!
[759]	683	!-- Add cyclic boundaries (additional layers are for calculating
	684	!-- flag arrays needed for the multigrid sover)
[114]	685	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	686	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	687	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	688	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	689
[1]	690	CASE DEFAULT
	691	!
	692	!-- The DEFAULT case is reached either if the parameter topography
[217]	693	!-- contains a wrong character string or if the user has defined a special
[1]	694	!-- case in the user interface. There, the subroutine user_init_grid
	695	!-- checks which of these two conditions applies.
[114]	696	CALL user_init_grid( gls, nzb_local )
[1]	697
	698	END SELECT
	699	!
[861]	700	!-- Determine the maximum level of topography. Furthermore it is used for
	701	!-- steering the degradation of order of the applied advection scheme.
[978]	702	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	703	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	704	nzb_max = MAXVAL( nzb_local )
[1353]	705	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[978]	706	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	707	nzb_max = nzt
	708	ENDIF
	709
[861]	710	!
[1]	711	!-- Consistency checks and index array initialization are only required for
[217]	712	!-- non-flat topography, also the initialization of topography height arrays
[49]	713	!-- zu_s_inner and zw_w_inner
[1]	714	IF ( TRIM( topography ) /= 'flat' ) THEN
	715
	716	!
	717	!-- Consistency checks
	718	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	719	WRITE( message_string, * ) 'nzb_local values are outside the', &
	720	'model domain', &
	721	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	722	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	723	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	724	ENDIF
	725
[722]	726	IF ( bc_lr == 'cyclic' ) THEN
[1353]	727	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	728	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	729	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	730	' boundary condition in x-direction'
	731	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	732	ENDIF
	733	ENDIF
[722]	734	IF ( bc_ns == 'cyclic' ) THEN
[1353]	735	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	736	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	737	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	738	' boundary condition in y-direction'
	739	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	740	ENDIF
	741	ENDIF
	742
[217]	743	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	744	!
[217]	745	!-- The array nzb_local as defined using the 'cell_edge' convention
	746	!-- describes the actual total size of topography which is defined at the
	747	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	748	!-- on the topography walls in y-direction. However, PALM uses individual
	749	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	750	!-- Therefore, the extent of topography in nzb_local is now reduced by
	751	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	752	!-- to form the basis for nzb_s_inner.
	753	DO j = -gls, ny + gls
	754	DO i = -gls, nx
	755	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	756	ENDDO
[134]	757	ENDDO
[217]	758	!-- apply cyclic boundary conditions in x-direction
	759	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	760	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	761	DO i = -gls, nx + gls
	762	DO j = -gls, ny
	763	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	764	ENDDO
[134]	765	ENDDO
[217]	766	!-- apply cyclic boundary conditions in y-direction
	767	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	768	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	769	ENDIF
[134]	770
[1]	771	!
	772	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	773	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	774	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	775
	776	!
	777	!-- Initialize remaining index arrays:
	778	!-- first pre-initialize them with nzb_s_inner...
	779	nzb_u_inner = nzb_s_inner
	780	nzb_u_outer = nzb_s_inner
	781	nzb_v_inner = nzb_s_inner
	782	nzb_v_outer = nzb_s_inner
	783	nzb_w_outer = nzb_s_inner
	784	nzb_s_outer = nzb_s_inner
	785
	786	!
	787	!-- ...then extend pre-initialized arrays in their according directions
	788	!-- based on nzb_local using nzb_tmp as a temporary global index array
	789
	790	!
	791	!-- nzb_s_outer:
	792	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	793	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	794	DO j = -1, ny + 1
	795	DO i = 0, nx
[1353]	796	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	797	nzb_local(j,i+1) )
	798	ENDDO
	799	ENDDO
	800	DO i = nxl, nxr
	801	DO j = nys, nyn
[1353]	802	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	803	nzb_tmp(j+1,i) )
	804	ENDDO
	805	!
	806	!-- non-cyclic boundary conditions (overwritten by call of
	807	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	808	IF ( nys == 0 ) THEN
	809	j = -1
	810	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	811	ENDIF
	812	IF ( nys == ny ) THEN
	813	j = ny + 1
	814	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	815	ENDIF
	816	ENDDO
	817	!
	818	!-- nzb_w_outer:
	819	!-- identical to nzb_s_outer
	820	nzb_w_outer = nzb_s_outer
	821
	822	!
	823	!-- nzb_u_inner:
	824	!-- extend nzb_local rightwards only
[667]	825	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	826	DO j = -1, ny + 1
	827	DO i = 0, nx + 1
	828	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	829	ENDDO
	830	ENDDO
[667]	831	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	832
	833	!
	834	!-- nzb_u_outer:
	835	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	836	DO i = nxl, nxr
	837	DO j = nys, nyn
[1353]	838	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	839	nzb_tmp(j+1,i) )
	840	ENDDO
	841	!
	842	!-- non-cyclic boundary conditions (overwritten by call of
	843	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	844	IF ( nys == 0 ) THEN
	845	j = -1
	846	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	847	ENDIF
	848	IF ( nys == ny ) THEN
	849	j = ny + 1
	850	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	851	ENDIF
	852	ENDDO
	853
	854	!
	855	!-- nzb_v_inner:
	856	!-- extend nzb_local northwards only
[667]	857	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	858	DO i = -1, nx + 1
	859	DO j = 0, ny + 1
	860	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	861	ENDDO
	862	ENDDO
[667]	863	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	864
	865	!
	866	!-- nzb_v_outer:
	867	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	868	DO j = nys, nyn
	869	DO i = nxl, nxr
[1353]	870	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	871	nzb_tmp(j,i+1) )
	872	ENDDO
	873	!
	874	!-- non-cyclic boundary conditions (overwritten by call of
	875	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	876	IF ( nxl == 0 ) THEN
	877	i = -1
	878	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	879	ENDIF
	880	IF ( nxr == nx ) THEN
	881	i = nx + 1
	882	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	883	ENDIF
	884	ENDDO
[809]	885	#if ! defined ( __check )
[1]	886	!
	887	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	888	!-- boundary conditions, if applicable.
	889	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	890	!-- they do not require exchange and are not included here.
	891	CALL exchange_horiz_2d_int( nzb_u_inner )
	892	CALL exchange_horiz_2d_int( nzb_u_outer )
	893	CALL exchange_horiz_2d_int( nzb_v_inner )
	894	CALL exchange_horiz_2d_int( nzb_v_outer )
	895	CALL exchange_horiz_2d_int( nzb_w_outer )
	896	CALL exchange_horiz_2d_int( nzb_s_outer )
	897
[49]	898	!
	899	!-- Allocate and set the arrays containing the topography height
	900	IF ( myid == 0 ) THEN
	901
	902	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	903
	904	DO i = 0, nx + 1
	905	DO j = 0, ny + 1
	906	zu_s_inner(i,j) = zu(nzb_local(j,i))
	907	zw_w_inner(i,j) = zw(nzb_local(j,i))
	908	ENDDO
	909	ENDDO
	910
	911	ENDIF
[1221]	912	!
	913	!-- Set flag arrays to be used for masking of grid points
	914	DO i = nxlg, nxrg
	915	DO j = nysg, nyng
	916	DO k = nzb, nzt+1
[1353]	917	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	918	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	919	ENDDO
	920	ENDDO
	921	ENDDO
[807]	922	#endif
[1]	923	ENDIF
	924
[809]	925	#if ! defined ( __check )
[1]	926	!
	927	!-- Preliminary: to be removed after completion of the topography code!
	928	!-- Set the former default k index arrays nzb_2d
	929	nzb_2d = nzb
	930
	931	!
	932	!-- Set the individual index arrays which define the k index from which on
	933	!-- the usual finite difference form (which does not use surface fluxes) is
	934	!-- applied
	935	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	936	nzb_diff_u = nzb_u_inner + 2
	937	nzb_diff_v = nzb_v_inner + 2
	938	nzb_diff_s_inner = nzb_s_inner + 2
	939	nzb_diff_s_outer = nzb_s_outer + 2
	940	ELSE
	941	nzb_diff_u = nzb_u_inner + 1
	942	nzb_diff_v = nzb_v_inner + 1
	943	nzb_diff_s_inner = nzb_s_inner + 1
	944	nzb_diff_s_outer = nzb_s_outer + 1
	945	ENDIF
	946
	947	!
	948	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	949	!-- for limitation of near-wall mixing length l_wall further below
	950	corner_nl = 0
	951	corner_nr = 0
	952	corner_sl = 0
	953	corner_sr = 0
	954	wall_l = 0
	955	wall_n = 0
	956	wall_r = 0
	957	wall_s = 0
	958
	959	DO i = nxl, nxr
	960	DO j = nys, nyn
	961	!
	962	!-- u-component
	963	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	964	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	965	fym(j,i) = 0.0_wp
	966	fyp(j,i) = 1.0_wp
[1]	967	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	968	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	969	fym(j,i) = 1.0_wp
	970	fyp(j,i) = 0.0_wp
[1]	971	ENDIF
	972	!
	973	!-- v-component
	974	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	975	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	976	fxm(j,i) = 0.0_wp
	977	fxp(j,i) = 1.0_wp
[1]	978	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	979	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	980	fxm(j,i) = 1.0_wp
	981	fxp(j,i) = 0.0_wp
[1]	982	ENDIF
	983	!
	984	!-- w-component, also used for scalars, separate arrays for shear
	985	!-- production of tke
	986	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	987	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	988	wall_w_y(j,i) = 1.0_wp
	989	fwym(j,i) = 0.0_wp
	990	fwyp(j,i) = 1.0_wp
[1]	991	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	992	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	993	wall_w_y(j,i) = 1.0_wp
	994	fwym(j,i) = 1.0_wp
	995	fwyp(j,i) = 0.0_wp
[1]	996	ENDIF
	997	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	998	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	999	wall_w_x(j,i) = 1.0_wp
	1000	fwxm(j,i) = 0.0_wp
	1001	fwxp(j,i) = 1.0_wp
[1]	1002	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1003	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1004	wall_w_x(j,i) = 1.0_wp
	1005	fwxm(j,i) = 1.0_wp
	1006	fwxp(j,i) = 0.0_wp
[1]	1007	ENDIF
	1008	!
	1009	!-- Wall and corner locations inside buildings for limitation of
	1010	!-- near-wall mixing length l_wall
	1011	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1012
	1013	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1014
	1015	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1016	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1017	nzb_s_inner(j,i-1) ) + 1
	1018	ENDIF
	1019
	1020	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1021	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1022	nzb_s_inner(j,i+1) ) + 1
	1023	ENDIF
	1024
	1025	ENDIF
	1026
	1027	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1028
	1029	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1030	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1031	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1032	nzb_s_inner(j,i-1) ) + 1
	1033	ENDIF
	1034
	1035	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1036	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1037	nzb_s_inner(j,i+1) ) + 1
	1038	ENDIF
	1039
	1040	ENDIF
	1041
	1042	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1043	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1044	ENDIF
	1045
	1046	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1047	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1048	ENDIF
	1049
	1050	ENDDO
	1051	ENDDO
	1052
	1053	!
[114]	1054	!-- Calculate wall flag arrays for the multigrid method
[1575]	1055	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1056	!
	1057	!-- Gridpoint increment of the current level
	1058	inc = 1
	1059
	1060	DO l = maximum_grid_level, 1 , -1
	1061
	1062	nxl_l = nxl_mg(l)
	1063	nxr_l = nxr_mg(l)
	1064	nys_l = nys_mg(l)
	1065	nyn_l = nyn_mg(l)
	1066	nzt_l = nzt_mg(l)
	1067
	1068	!
	1069	!-- Assign the flag level to be calculated
	1070	SELECT CASE ( l )
	1071	CASE ( 1 )
	1072	flags => wall_flags_1
	1073	CASE ( 2 )
	1074	flags => wall_flags_2
	1075	CASE ( 3 )
	1076	flags => wall_flags_3
	1077	CASE ( 4 )
	1078	flags => wall_flags_4
	1079	CASE ( 5 )
	1080	flags => wall_flags_5
	1081	CASE ( 6 )
	1082	flags => wall_flags_6
	1083	CASE ( 7 )
	1084	flags => wall_flags_7
	1085	CASE ( 8 )
	1086	flags => wall_flags_8
	1087	CASE ( 9 )
	1088	flags => wall_flags_9
	1089	CASE ( 10 )
	1090	flags => wall_flags_10
	1091	END SELECT
	1092
	1093	!
	1094	!-- Depending on the grid level, set the respective bits in case of
	1095	!-- neighbouring walls
	1096	!-- Bit 0: wall to the bottom
	1097	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1098	!-- Bit 2: wall to the south
	1099	!-- Bit 3: wall to the north
	1100	!-- Bit 4: wall to the left
	1101	!-- Bit 5: wall to the right
[116]	1102	!-- Bit 6: inside building
[114]	1103
	1104	flags = 0
	1105
[927]	1106	!
	1107	!-- In case of masking method, flags are not set and multigrid method
	1108	!-- works like FFT-solver
	1109	IF ( .NOT. masking_method ) THEN
	1110
	1111	DO i = nxl_l-1, nxr_l+1
	1112	DO j = nys_l-1, nyn_l+1
	1113	DO k = nzb, nzt_l+1
[114]	1114
	1115	!
[927]	1116	!-- Inside/outside building (inside building does not need
	1117	!-- further tests for walls)
	1118	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1119
[927]	1120	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1121
[927]	1122	ELSE
[114]	1123	!
[927]	1124	!-- Bottom wall
	1125	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1126	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1127	ENDIF
[114]	1128	!
[927]	1129	!-- South wall
	1130	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1131	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1132	ENDIF
[114]	1133	!
[927]	1134	!-- North wall
	1135	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1136	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1137	ENDIF
[114]	1138	!
[927]	1139	!-- Left wall
	1140	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1141	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1142	ENDIF
[114]	1143	!
[927]	1144	!-- Right wall
	1145	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1146	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1147	ENDIF
	1148
[114]	1149	ENDIF
	1150
[927]	1151	ENDDO
[114]	1152	ENDDO
	1153	ENDDO
	1154
[927]	1155	ENDIF
	1156
[114]	1157	!
	1158	!-- Test output of flag arrays
[145]	1159	! i = nxl_l
	1160	! WRITE (9,*) ' '
	1161	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1162	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1163	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1164	! DO k = nzt_l+1, nzb, -1
	1165	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1166	! ENDDO
[114]	1167
	1168	inc = inc * 2
	1169
	1170	ENDDO
	1171
	1172	ENDIF
[861]	1173	!
	1174	!-- Allocate flags needed for masking walls.
[1221]	1175	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr), &
	1176	wall_flags_00(nzb:nzt,nys:nyn,nxl:nxr) )
	1177	wall_flags_0 = 0
	1178	wall_flags_00 = 0
[114]	1179
[1557]	1180	IF ( scalar_advec == 'ws-scheme' .OR. &
	1181	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1182	!
[861]	1183	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1184	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1185	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1186	!-- grid points.
	1187	DO i = nxl, nxr
	1188	DO j = nys, nyn
	1189	DO k = nzb_s_inner(j,i)+1, nzt
	1190	!
	1191	!-- scalar - x-direction
	1192	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1193	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1194	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1195	.AND. i == nxr ) ) THEN
[861]	1196	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1197	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1198	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1199	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1200	) THEN
[861]	1201	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1202	ELSE
	1203	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1204	ENDIF
	1205	!
	1206	!-- scalar - y-direction
	1207	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1208	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1209	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1210	.AND. j == nyn ) ) THEN
[861]	1211	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1212	!-- WS3
	1213	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1214	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1215	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1216	) THEN
[861]	1217	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1218	!-- WS5
	1219	ELSE
	1220	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1221	ENDIF
	1222	!
	1223	!-- scalar - z-direction
	1224	!-- WS1 (6), WS3 (7), WS5 (8)
	1225	flag_set = .FALSE.
	1226	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1227	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1228	flag_set = .TRUE.
	1229	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1230	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1231	flag_set = .TRUE.
	1232	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1233	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1234	ENDIF
	1235	ENDDO
	1236	ENDDO
	1237	ENDDO
	1238	ENDIF
	1239
	1240	IF ( momentum_advec == 'ws-scheme' ) THEN
	1241	!
	1242	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1243	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1244	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1245	!-- grid points.
	1246	DO i = nxl, nxr
	1247	DO j = nys, nyn
[1580]	1248	DO k = nzb+1, nzt
[861]	1249	!
[1580]	1250	!-- At first, set flags to WS1.
	1251	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1252	!-- in order to handle the left/south flux.
	1253	!-- near vertical walls.
	1254	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1255	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1256	!
[861]	1257	!-- u component - x-direction
	1258	!-- WS1 (9), WS3 (10), WS5 (11)
	1259	IF ( k <= nzb_u_inner(j,i+1) &
[1409]	1260	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
[978]	1261	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1262	) THEN
[1580]	1263	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[861]	1264	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1265	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1266	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1267	) THEN
[861]	1268	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1269	!
	1270	!-- Clear flag for WS1
	1271	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1272	ELSE
	1273	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1274	!
	1275	!-- Clear flag for WS1
	1276	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1277	ENDIF
	1278	!
	1279	!-- u component - y-direction
	1280	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1281	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1282	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1283	.AND. j == nyn ) ) THEN
[1580]	1284	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1285	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1286	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1287	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1288	) THEN
[861]	1289	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1290	!
	1291	!-- Clear flag for WS1
	1292	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1293	ELSE
	1294	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1295	!
	1296	!-- Clear flag for WS1
	1297	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1298	ENDIF
	1299	!
	1300	!-- u component - z-direction
	1301	!-- WS1 (15), WS3 (16), WS5 (17)
	1302	flag_set = .FALSE.
	1303	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1304	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1305	flag_set = .TRUE.
	1306	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1307	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1308	flag_set = .TRUE.
	1309	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1310	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1311	ENDIF
	1312
	1313	ENDDO
	1314	ENDDO
	1315	ENDDO
	1316
	1317	DO i = nxl, nxr
	1318	DO j = nys, nyn
[1580]	1319	DO k = nzb+1, nzt
[861]	1320	!
[1580]	1321	!-- At first, set flags to WS1.
	1322	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1323	!-- in order to handle the left/south flux.
	1324	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1325	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1326	!
[861]	1327	!-- v component - x-direction
	1328	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1329	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1330	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1331	.AND. i == nxr ) ) THEN
[1580]	1332	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
[861]	1333	!-- WS3
	1334	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1335	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1336	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1337	) THEN
[861]	1338	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1339	!
	1340	!-- Clear flag for WS1
	1341	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1342	ELSE
	1343	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1344	!
	1345	!-- Clear flag for WS1
	1346	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1347	ENDIF
	1348	!
	1349	!-- v component - y-direction
	1350	!-- WS1 (21), WS3 (22), WS5 (23)
	1351	IF ( k <= nzb_v_inner(j+1,i) &
[1409]	1352	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
[978]	1353	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1354	) THEN
[1580]	1355	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1356	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1357	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1358	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1359	) THEN
[861]	1360	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1361	!
	1362	!-- Clear flag for WS1
	1363	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1364	ELSE
	1365	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1366	!
	1367	!-- Clear flag for WS1
	1368	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1369	ENDIF
	1370	!
	1371	!-- v component - z-direction
	1372	!-- WS1 (24), WS3 (25), WS5 (26)
	1373	flag_set = .FALSE.
	1374	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1375	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1376	flag_set = .TRUE.
	1377	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1378	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1379	flag_set = .TRUE.
	1380	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1381	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1382	ENDIF
	1383
	1384	ENDDO
	1385	ENDDO
	1386	ENDDO
	1387	DO i = nxl, nxr
	1388	DO j = nys, nyn
[1580]	1389	DO k = nzb+1, nzt
[861]	1390	!
[1580]	1391	!-- At first, set flags to WS1.
	1392	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1393	!-- in order to handle the left/south flux.
	1394	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1395	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1396	!
[861]	1397	!-- w component - x-direction
	1398	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1399	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1400	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1401	.AND. i == nxr ) ) THEN
[1580]	1402	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1403	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1404	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1405	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1406	) THEN
[861]	1407	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1408	!
	1409	!-- Clear flag for WS1
	1410	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1411	ELSE
	1412	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1413	!
	1414	!-- Clear flag for WS1
	1415	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1416	ENDIF
	1417	!
	1418	!-- w component - y-direction
	1419	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1420	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1421	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1422	.AND. j == nyn ) ) THEN
[1580]	1423	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1424	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1425	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1426	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1427	) THEN
[861]	1428	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1429	!
	1430	!-- Clear flag for WS1
	1431	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1432	ELSE
[1221]	1433	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1434	!
	1435	!-- Clear flag for WS1
	1436	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1437	ENDIF
	1438	!
	1439	!-- w component - z-direction
	1440	!-- WS1 (33), WS3 (34), WS5 (35)
	1441	flag_set = .FALSE.
	1442	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1443	.OR. k == nzt ) THEN
	1444	!
	1445	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1446	!-- set, although this is not a prognostic level. However,
	1447	!-- contrary to the advection of u,v and s this is necessary
	1448	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1449	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1450	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1451	flag_set = .TRUE.
	1452	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1453	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1454	flag_set = .TRUE.
	1455	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1456	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1457	ENDIF
	1458
	1459	ENDDO
	1460	ENDDO
	1461	ENDDO
	1462
	1463	ENDIF
	1464
	1465	!
[1]	1466	!-- In case of topography: limit near-wall mixing length l_wall further:
	1467	!-- Go through all points of the subdomain one by one and look for the closest
	1468	!-- surface
	1469	IF ( TRIM(topography) /= 'flat' ) THEN
	1470	DO i = nxl, nxr
	1471	DO j = nys, nyn
	1472
	1473	nzb_si = nzb_s_inner(j,i)
	1474	vi = vertical_influence(nzb_si)
	1475
	1476	IF ( wall_n(j,i) > 0 ) THEN
	1477	!
	1478	!-- North wall (y distance)
	1479	DO k = wall_n(j,i), nzb_si
[1353]	1480	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1481	ENDDO
	1482	!
	1483	!-- Above North wall (yz distance)
	1484	DO k = nzb_si + 1, nzb_si + vi
[1353]	1485	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1486	SQRT( 0.25_wp * dy**2 + &
[1]	1487	( zu(k) - zw(nzb_si) )**2 ) )
	1488	ENDDO
	1489	!
	1490	!-- Northleft corner (xy distance)
	1491	IF ( corner_nl(j,i) > 0 ) THEN
	1492	DO k = corner_nl(j,i), nzb_si
	1493	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1494	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1495	ENDDO
	1496	!
	1497	!-- Above Northleft corner (xyz distance)
	1498	DO k = nzb_si + 1, nzb_si + vi
[1353]	1499	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1500	SQRT( 0.25_wp * (dx2 + dy2) + &
	1501	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1502	ENDDO
	1503	ENDIF
	1504	!
	1505	!-- Northright corner (xy distance)
	1506	IF ( corner_nr(j,i) > 0 ) THEN
	1507	DO k = corner_nr(j,i), nzb_si
[1353]	1508	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1509	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1510	ENDDO
	1511	!
	1512	!-- Above northright corner (xyz distance)
	1513	DO k = nzb_si + 1, nzb_si + vi
[1353]	1514	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1515	SQRT( 0.25_wp * (dx2 + dy2) + &
	1516	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1517	ENDDO
	1518	ENDIF
	1519	ENDIF
	1520
	1521	IF ( wall_s(j,i) > 0 ) THEN
	1522	!
	1523	!-- South wall (y distance)
	1524	DO k = wall_s(j,i), nzb_si
[1353]	1525	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1526	ENDDO
	1527	!
	1528	!-- Above south wall (yz distance)
[1353]	1529	DO k = nzb_si + 1, nzb_si + vi
	1530	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1531	SQRT( 0.25_wp * dy**2 + &
[1]	1532	( zu(k) - zw(nzb_si) )**2 ) )
	1533	ENDDO
	1534	!
	1535	!-- Southleft corner (xy distance)
	1536	IF ( corner_sl(j,i) > 0 ) THEN
	1537	DO k = corner_sl(j,i), nzb_si
[1353]	1538	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1539	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1540	ENDDO
	1541	!
	1542	!-- Above southleft corner (xyz distance)
	1543	DO k = nzb_si + 1, nzb_si + vi
[1353]	1544	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1545	SQRT( 0.25_wp * (dx2 + dy2) + &
	1546	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1547	ENDDO
	1548	ENDIF
	1549	!
	1550	!-- Southright corner (xy distance)
	1551	IF ( corner_sr(j,i) > 0 ) THEN
	1552	DO k = corner_sr(j,i), nzb_si
[1353]	1553	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1554	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1555	ENDDO
	1556	!
	1557	!-- Above southright corner (xyz distance)
	1558	DO k = nzb_si + 1, nzb_si + vi
[1353]	1559	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1560	SQRT( 0.25_wp * (dx2 + dy2) + &
	1561	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1562	ENDDO
	1563	ENDIF
	1564
	1565	ENDIF
	1566
	1567	IF ( wall_l(j,i) > 0 ) THEN
	1568	!
	1569	!-- Left wall (x distance)
	1570	DO k = wall_l(j,i), nzb_si
[1353]	1571	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1572	ENDDO
	1573	!
	1574	!-- Above left wall (xz distance)
	1575	DO k = nzb_si + 1, nzb_si + vi
[1353]	1576	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1577	SQRT( 0.25_wp * dx**2 + &
	1578	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1579	ENDDO
	1580	ENDIF
	1581
	1582	IF ( wall_r(j,i) > 0 ) THEN
	1583	!
	1584	!-- Right wall (x distance)
	1585	DO k = wall_r(j,i), nzb_si
[1353]	1586	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1587	ENDDO
	1588	!
	1589	!-- Above right wall (xz distance)
	1590	DO k = nzb_si + 1, nzb_si + vi
[1353]	1591	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1592	SQRT( 0.25_wp * dx**2 + &
[1]	1593	( zu(k) - zw(nzb_si) )**2 ) )
	1594	ENDDO
	1595
	1596	ENDIF
	1597
	1598	ENDDO
	1599	ENDDO
	1600
	1601	ENDIF
	1602
	1603	!
	1604	!-- Multiplication with wall_adjustment_factor
	1605	l_wall = wall_adjustment_factor * l_wall
	1606
	1607	!
[709]	1608	!-- Set lateral boundary conditions for l_wall
[667]	1609	CALL exchange_horiz( l_wall, nbgp )
	1610
[1]	1611	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1612	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1613
[807]	1614	#endif
[1]	1615
	1616	END SUBROUTINE init_grid

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