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source: palm/trunk/SOURCE/init_grid.f90 @ 1692

Last change on this file since 1692 was 1692, checked in by maronga, 8 years ago
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[1682]	1	!> @file init_grid.f90
[1036]	2	!--------------------------------------------------------------------------------!
	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1691]	16	! Copyright 1997-2015 Leibniz Universitaet Hannover
[1036]	17	!--------------------------------------------------------------------------------!
	18	!
[254]	19	! Current revisions:
[1]	20	! -----------------
[1581]	21	!
[1692]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: init_grid.f90 1692 2015-10-26 16:29:17Z maronga $
	26	!
[1692]	27	! 1691 2015-10-26 16:17:44Z maronga
	28	! Renamed prandtl_layer to constant_flux_layer.
	29	!
[1683]	30	! 1682 2015-10-07 23:56:08Z knoop
	31	! Code annotations made doxygen readable
	32	!
[1678]	33	! 1677 2015-10-02 13:25:23Z boeske
	34	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	35	!
[1676]	36	! 1675 2015-10-02 08:28:59Z gronemeier
	37	! Bugfix: Definition of topography grid levels
	38	!
[1662]	39	! 1660 2015-09-21 08:15:16Z gronemeier
	40	! Bugfix: Definition of topography grid levels if vertical grid stretching
	41	! starts below the maximum topography height.
	42	!
[1581]	43	! 1580 2015-04-10 13:43:49Z suehring
	44	! Bugfix: setting flags for 5th order scheme near buildings
	45	!
[1576]	46	! 1575 2015-03-27 09:56:27Z raasch
	47	! adjustments for psolver-queries
	48	!
[1558]	49	! 1557 2015-03-05 16:43:04Z suehring
	50	! Adjustment for monotoinic limiter
	51	!
[1419]	52	! 1418 2014-06-06 13:05:08Z fricke
	53	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	54	! condition and a negative value for dz_stretch_level the condition
	55	! was always true for the whole model domain
	56	!
[1410]	57	! 1409 2014-05-23 12:11:32Z suehring
	58	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	59	! j <= nysv
	60	!
[1354]	61	! 1353 2014-04-08 15:21:23Z heinze
	62	! REAL constants provided with KIND-attribute
	63	!
[1323]	64	! 1322 2014-03-20 16:38:49Z raasch
	65	! REAL constants defined as wp-kind
	66	!
[1321]	67	! 1320 2014-03-20 08:40:49Z raasch
[1320]	68	! ONLY-attribute added to USE-statements,
	69	! kind-parameters added to all INTEGER and REAL declaration statements,
	70	! kinds are defined in new module kinds,
	71	! revision history before 2012 removed,
	72	! comment fields (!:) to be used for variable explanations added to
	73	! all variable declaration statements
[1321]	74	!
[1222]	75	! 1221 2013-09-10 08:59:13Z raasch
	76	! wall_flags_00 introduced to hold bits 32-63,
	77	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	78	! loops optimized for openACC (pres + flow_statistics)
	79	!
[1093]	80	! 1092 2013-02-02 11:24:22Z raasch
	81	! unused variables removed
	82	!
[1070]	83	! 1069 2012-11-28 16:18:43Z maronga
	84	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	85	! model in case of coupled runs
	86	!
[1037]	87	! 1036 2012-10-22 13:43:42Z raasch
	88	! code put under GPL (PALM 3.9)
	89	!
[1017]	90	! 1015 2012-09-27 09:23:24Z raasch
	91	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	92	! nzb_w_inner+1
	93	!
[997]	94	! 996 2012-09-07 10:41:47Z raasch
	95	! little reformatting
	96	!
[979]	97	! 978 2012-08-09 08:28:32Z fricke
	98	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	99	! Bugfix: Set wall_flags_0 for inflow boundary
	100	!
[928]	101	! 927 2012-06-06 19:15:04Z raasch
	102	! Wall flags are not set for multigrid method in case of masking method
	103	!
[865]	104	! 864 2012-03-27 15:10:33Z gryschka
[927]	105	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	106	! were not correctly defined for k=1.
[865]	107	!
[863]	108	! 861 2012-03-26 14:18:34Z suehring
[861]	109	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	110	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	111	! model domain.!
[861]	112	! Initialization of nzb_s_inner and nzb_w_inner.
	113	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	114	! while setting wall_flags_0
	115	!
[844]	116	! 843 2012-02-29 15:16:21Z gryschka
	117	! In case of ocean and dirichlet bc for u and v at the bottom
	118	! the first u-level ist defined at same height as the first w-level
	119	!
[819]	120	! 818 2012-02-08 16:11:23Z maronga
	121	! Bugfix: topo_height is only required if topography is used. It is thus now
	122	! allocated in the topography branch
	123	!
[810]	124	! 809 2012-01-30 13:32:58Z maronga
	125	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	126	!
[808]	127	! 807 2012-01-25 11:53:51Z maronga
	128	! New cpp directive "__check" implemented which is used by check_namelist_files
	129	!
[1]	130	! Revision 1.1 1997/08/11 06:17:45 raasch
	131	! Initial revision (Testversion)
	132	!
	133	!
	134	! Description:
	135	! ------------
[1682]	136	!> Creating grid depending constants
[1]	137	!------------------------------------------------------------------------------!
[1682]	138	SUBROUTINE init_grid
	139
[1]	140
[1320]	141	USE arrays_3d, &
	142	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	143	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	144
[1353]	145	USE control_parameters, &
[1320]	146	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	147	building_length_y, building_wall_left, building_wall_south, &
	148	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	149	canyon_width_x, canyon_width_y, constant_flux_layer, &
	150	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	151	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	152	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	153	masking_method, maximum_grid_level, message_string, &
	154	momentum_advec, ocean, outflow_l, outflow_n, outflow_r, &
	155	outflow_s, psolver, scalar_advec, topography, &
	156	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	157	wall_adjustment_factor
[1320]	158
	159	USE grid_variables, &
	160	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	161	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	162	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	163
	164	USE indices, &
	165	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	166	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	167	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	168	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	169	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	170	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	171	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	172	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	173	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	174	wall_flags_9
	175
	176	USE kinds
	177
[1]	178	USE pegrid
	179
	180	IMPLICIT NONE
	181
[1682]	182	INTEGER(iwp) :: bh !<
	183	INTEGER(iwp) :: blx !<
	184	INTEGER(iwp) :: bly !<
	185	INTEGER(iwp) :: bxl !<
	186	INTEGER(iwp) :: bxr !<
	187	INTEGER(iwp) :: byn !<
	188	INTEGER(iwp) :: bys !<
	189	INTEGER(iwp) :: ch !<
	190	INTEGER(iwp) :: cwx !<
	191	INTEGER(iwp) :: cwy !<
	192	INTEGER(iwp) :: cxl !<
	193	INTEGER(iwp) :: cxr !<
	194	INTEGER(iwp) :: cyn !<
	195	INTEGER(iwp) :: cys !<
	196	INTEGER(iwp) :: gls !<
	197	INTEGER(iwp) :: i !<
	198	INTEGER(iwp) :: ii !<
	199	INTEGER(iwp) :: inc !<
	200	INTEGER(iwp) :: j !<
	201	INTEGER(iwp) :: k !<
	202	INTEGER(iwp) :: l !<
	203	INTEGER(iwp) :: nxl_l !<
	204	INTEGER(iwp) :: nxr_l !<
	205	INTEGER(iwp) :: nyn_l !<
	206	INTEGER(iwp) :: nys_l !<
	207	INTEGER(iwp) :: nzb_si !<
	208	INTEGER(iwp) :: nzt_l !<
	209	INTEGER(iwp) :: vi !<
[1]	210
[1682]	211	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
[1]	212
[1682]	213	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
	214	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
	215	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
	216	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
	217	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
	218	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
	219	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
	220	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
	221	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
	222	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
[1]	223
[1682]	224	LOGICAL :: flag_set = .FALSE. !<
[861]	225
[1682]	226	REAL(wp) :: dx_l !<
	227	REAL(wp) :: dy_l !<
	228	REAL(wp) :: dz_stretched !<
[1]	229
[1682]	230	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
[1]	231
[667]	232
[1]	233	!
[709]	234	!-- Calculation of horizontal array bounds including ghost layers
[667]	235	nxlg = nxl - nbgp
	236	nxrg = nxr + nbgp
	237	nysg = nys - nbgp
	238	nyng = nyn + nbgp
[709]	239
[667]	240	!
[1]	241	!-- Allocate grid arrays
[1353]	242	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	243	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	244
	245	!
	246	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	247	IF ( dz == -1.0_wp ) THEN
[254]	248	message_string = 'missing dz'
	249	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	250	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	251	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	252	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	253	ENDIF
[94]	254
[1]	255	!
[94]	256	!-- Define the vertical grid levels
	257	IF ( .NOT. ocean ) THEN
	258	!
	259	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	260	!-- The second u-level (k=1) corresponds to the top of the
[94]	261	!-- Prandtl-layer.
[667]	262
	263	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	264	zu(0) = 0.0_wp
	265	! zu(0) = - dz * 0.5_wp
[667]	266	ELSE
[1353]	267	zu(0) = - dz * 0.5_wp
[667]	268	ENDIF
[1353]	269	zu(1) = dz * 0.5_wp
[1]	270
[94]	271	dz_stretch_level_index = nzt+1
	272	dz_stretched = dz
	273	DO k = 2, nzt+1
	274	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	275	dz_stretched = dz_stretched * dz_stretch_factor
	276	dz_stretched = MIN( dz_stretched, dz_max )
	277	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	278	ENDIF
	279	zu(k) = zu(k-1) + dz_stretched
	280	ENDDO
[1]	281
	282	!
[94]	283	!-- Compute the w-levels. They are always staggered half-way between the
[843]	284	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	285	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	286	!-- The top w-level is extrapolated linearly.
[1353]	287	zw(0) = 0.0_wp
[94]	288	DO k = 1, nzt
[1353]	289	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	290	ENDDO
[1353]	291	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	292
[94]	293	ELSE
[1]	294	!
[843]	295	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	296	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	297	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	298	!-- w-level are defined at same height, but staggered from the second level.
	299	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	300	zu(nzt+1) = dz * 0.5_wp
	301	zu(nzt) = - dz * 0.5_wp
[94]	302
	303	dz_stretch_level_index = 0
	304	dz_stretched = dz
	305	DO k = nzt-1, 0, -1
[1418]	306	!
	307	!-- The default value of dz_stretch_level is positive, thus the first
	308	!-- condition is always true. Hence, the second condition is necessary.
	309	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	310	.AND. dz_stretched < dz_max ) THEN
[94]	311	dz_stretched = dz_stretched * dz_stretch_factor
	312	dz_stretched = MIN( dz_stretched, dz_max )
	313	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	314	ENDIF
	315	zu(k) = zu(k+1) - dz_stretched
	316	ENDDO
	317
	318	!
	319	!-- Compute the w-levels. They are always staggered half-way between the
[843]	320	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	321	!-- at the ground. In this case the first u- and w-level are defined at
	322	!-- same height. The top w-level (nzt+1) is not used but set for
	323	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	324	zw(nzt+1) = dz
[1353]	325	zw(nzt) = 0.0_wp
[94]	326	DO k = 0, nzt
[1353]	327	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	328	ENDDO
	329
[843]	330	!
	331	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	332	!-- at same height.
	333	IF ( ibc_uv_b == 0 ) THEN
	334	zu(0) = zw(0)
	335	ENDIF
	336
[94]	337	ENDIF
	338
	339	!
[1]	340	!-- Compute grid lengths.
	341	DO k = 1, nzt+1
	342	dzu(k) = zu(k) - zu(k-1)
[1353]	343	ddzu(k) = 1.0_wp / dzu(k)
[1]	344	dzw(k) = zw(k) - zw(k-1)
[1353]	345	ddzw(k) = 1.0_wp / dzw(k)
[1]	346	ENDDO
	347
	348	DO k = 1, nzt
[1353]	349	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	350	ENDDO
[667]	351
	352	!
[709]	353	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	354	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	355	!-- is only dz/2, but should be dz. Therefore, an additional array
	356	!-- containing with appropriate grid information is created for these
	357	!-- solvers.
[1575]	358	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	359	ALLOCATE( ddzu_pres(1:nzt+1) )
	360	ddzu_pres = ddzu
[864]	361	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	362	ENDIF
[1]	363
	364	!
	365	!-- In case of multigrid method, compute grid lengths and grid factors for the
	366	!-- grid levels
[1575]	367	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	368
	369	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	370	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	371	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	372	f1_mg(nzb+1:nzt,maximum_grid_level), &
	373	f2_mg(nzb+1:nzt,maximum_grid_level), &
	374	f3_mg(nzb+1:nzt,maximum_grid_level) )
	375
	376	dzu_mg(:,maximum_grid_level) = dzu
[667]	377	!
[864]	378	!-- Next line to ensure an equally spaced grid.
	379	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	380
[1]	381	dzw_mg(:,maximum_grid_level) = dzw
	382	nzt_l = nzt
	383	DO l = maximum_grid_level-1, 1, -1
[1353]	384	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	385	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	386	nzt_l = nzt_l / 2
	387	DO k = 2, nzt_l+1
	388	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	389	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	390	ENDDO
	391	ENDDO
	392
	393	nzt_l = nzt
	394	dx_l = dx
	395	dy_l = dy
	396	DO l = maximum_grid_level, 1, -1
[1353]	397	ddx2_mg(l) = 1.0_wp / dx_l**2
	398	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	399	DO k = nzb+1, nzt_l
[1353]	400	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	401	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	402	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	403	f2_mg(k,l) + f3_mg(k,l)
	404	ENDDO
	405	nzt_l = nzt_l / 2
[1353]	406	dx_l = dx_l * 2.0_wp
	407	dy_l = dy_l * 2.0_wp
[1]	408	ENDDO
	409
	410	ENDIF
	411
	412	!
	413	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	414	ddx = 1.0_wp / dx
	415	ddy = 1.0_wp / dy
[1]	416	dx2 = dx * dx
	417	dy2 = dy * dy
[1353]	418	ddx2 = 1.0_wp / dx2
	419	ddy2 = 1.0_wp / dy2
[1]	420
	421	!
	422	!-- Compute the grid-dependent mixing length.
	423	DO k = 1, nzt
[1322]	424	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	425	ENDDO
	426
	427	!
	428	!-- Allocate outer and inner index arrays for topography and set
[114]	429	!-- defaults.
	430	!-- nzb_local has to contain additional layers of ghost points for calculating
	431	!-- the flag arrays needed for the multigrid method
	432	gls = 2**( maximum_grid_level )
[861]	433	IF ( gls < nbgp ) gls = nbgp
[667]	434
[114]	435	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	436	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	437	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	438	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	439	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	440	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	441	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	442	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	443	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	444	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	445	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	446	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	447	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	448	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	449	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	450	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	451	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	452	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	453	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	454	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	455	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	456	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	457	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	458	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	459	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	460	wall_e_x(nysg:nyng,nxlg:nxrg), &
	461	wall_e_y(nysg:nyng,nxlg:nxrg), &
	462	wall_u(nysg:nyng,nxlg:nxrg), &
	463	wall_v(nysg:nyng,nxlg:nxrg), &
	464	wall_w_x(nysg:nyng,nxlg:nxrg), &
	465	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	466
	467
[667]	468
	469	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	470
[818]	471
[1]	472	nzb_s_inner = nzb; nzb_s_outer = nzb
	473	nzb_u_inner = nzb; nzb_u_outer = nzb
	474	nzb_v_inner = nzb; nzb_v_outer = nzb
	475	nzb_w_inner = nzb; nzb_w_outer = nzb
	476
[1353]	477	rflags_s_inner = 1.0_wp
	478	rflags_invers = 1.0_wp
[1221]	479
[1]	480	!
[19]	481	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	482	!-- form (which does not use surface fluxes) is applied
[1691]	483	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	484	nzb_diff = nzb + 2
	485	ELSE
	486	nzb_diff = nzb + 1
	487	ENDIF
[19]	488	IF ( use_top_fluxes ) THEN
	489	nzt_diff = nzt - 1
	490	ELSE
	491	nzt_diff = nzt
	492	ENDIF
[1]	493
	494	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	495	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	496
[1353]	497	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	498	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	499	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	500	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	501
	502	!
	503	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	504	!-- for the moment,
	505	!-- multiplication with wall_adjustment_factor near the end of this routine
	506	l_wall(nzb,:,:) = l_grid(1)
	507	DO k = nzb+1, nzt
	508	l_wall(k,:,:) = l_grid(k)
	509	ENDDO
	510	l_wall(nzt+1,:,:) = l_grid(nzt)
	511
	512	ALLOCATE ( vertical_influence(nzb:nzt) )
	513	DO k = 1, nzt
	514	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	515	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	516	ENDDO
	517
	518	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	519	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	520	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	521	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	522	'threshold given by only local', &
	523	' &horizontal reduction of near_wall ', &
	524	'mixing length l_wall', &
	525	' &starting from height level k = ', k, '.'
	526	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	527	EXIT
	528	ENDIF
	529	ENDDO
	530	vertical_influence(0) = vertical_influence(1)
	531
[667]	532	DO i = nxlg, nxrg
	533	DO j = nysg, nyng
[1]	534	DO k = nzb_s_inner(j,i) + 1, &
	535	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	536	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	537	ENDDO
	538	ENDDO
	539	ENDDO
	540
	541	!
	542	!-- Set outer and inner index arrays for non-flat topography.
	543	!-- Here consistency checks concerning domain size and periodicity are
	544	!-- necessary.
	545	!-- Within this SELECT CASE structure only nzb_local is initialized
	546	!-- individually depending on the chosen topography type, all other index
	547	!-- arrays are initialized further below.
	548	SELECT CASE ( TRIM( topography ) )
	549
	550	CASE ( 'flat' )
	551	!
[555]	552	!-- nzb_local is required for the multigrid solver
	553	nzb_local = 0
[1]	554
	555	CASE ( 'single_building' )
	556	!
	557	!-- Single rectangular building, by default centered in the middle of the
	558	!-- total domain
	559	blx = NINT( building_length_x / dx )
	560	bly = NINT( building_length_y / dy )
[1675]	561	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	562	IF ( ABS( zw(bh ) - building_height ) == &
	563	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	564
[1322]	565	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	566	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	567	ENDIF
	568	bxl = NINT( building_wall_left / dx )
	569	bxr = bxl + blx
	570
[1322]	571	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	572	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	573	ENDIF
	574	bys = NINT( building_wall_south / dy )
	575	byn = bys + bly
	576
	577	!
	578	!-- Building size has to meet some requirements
	579	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	580	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	581	WRITE( message_string, * ) 'inconsistent building parameters:', &
	582	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	583	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	584	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	585	ENDIF
	586
	587	!
[217]	588	!-- Define the building.
[1]	589	nzb_local = 0
[134]	590	nzb_local(bys:byn,bxl:bxr) = bh
[1]	591
[240]	592	CASE ( 'single_street_canyon' )
	593	!
	594	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	595	!-- The canyon is centered in the other direction by default.
[1322]	596	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	597	!
	598	!-- Street canyon in y direction
	599	cwx = NINT( canyon_width_x / dx )
[1322]	600	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	601	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	602	ENDIF
	603	cxl = NINT( canyon_wall_left / dx )
	604	cxr = cxl + cwx
	605
[1322]	606	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	607	!
	608	!-- Street canyon in x direction
	609	cwy = NINT( canyon_width_y / dy )
[1322]	610	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	611	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	612	ENDIF
	613	cys = NINT( canyon_wall_south / dy )
	614	cyn = cys + cwy
	615
	616	ELSE
[254]	617
	618	message_string = 'no street canyon width given'
	619	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	620
[240]	621	ENDIF
	622
[1675]	623	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	624	IF ( ABS( zw(ch ) - canyon_height ) == &
	625	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	626
[240]	627	dp_level_ind_b = ch
	628	!
	629	!-- Street canyon size has to meet some requirements
[1322]	630	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	631	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	632	( ch < 3 ) ) THEN
[1353]	633	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	634	'&cxl=', cxl, 'cxr=', cxr, &
	635	'cwx=', cwx, &
[254]	636	'ch=', ch, 'nx=', nx, 'ny=', ny
	637	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	638	ENDIF
[1322]	639	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	640	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	641	( ch < 3 ) ) THEN
[1353]	642	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	643	'&cys=', cys, 'cyn=', cyn, &
	644	'cwy=', cwy, &
[254]	645	'ch=', ch, 'nx=', nx, 'ny=', ny
	646	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	647	ENDIF
	648	ENDIF
[1353]	649	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	650	canyon_width_y /= 9999999.9_wp ) THEN
	651	message_string = 'inconsistent canyon parameters:' // &
	652	'&street canyon can only be oriented' // &
[254]	653	'&either in x- or in y-direction'
	654	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	655	ENDIF
	656
	657	nzb_local = ch
[1322]	658	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	659	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	660	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	661	nzb_local(cys+1:cyn-1,:) = 0
	662	ENDIF
	663
[1]	664	CASE ( 'read_from_file' )
[759]	665
[818]	666	ALLOCATE ( topo_height(0:ny,0:nx) )
	667
[759]	668	DO ii = 0, io_blocks-1
	669	IF ( ii == io_group ) THEN
	670
[1]	671	!
[759]	672	!-- Arbitrary irregular topography data in PALM format (exactly
	673	!-- matching the grid size and total domain size)
[1069]	674	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	675	FORM='FORMATTED', ERR=10 )
	676	DO j = ny, 0, -1
	677	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	678	ENDDO
	679
	680	GOTO 12
	681
[1069]	682	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	683	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	684
[1069]	685	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	686	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	687
	688	12 CLOSE( 90 )
	689
	690	ENDIF
[809]	691	#if defined( __parallel ) && ! defined ( __check )
[759]	692	CALL MPI_BARRIER( comm2d, ierr )
	693	#endif
[559]	694	ENDDO
[759]	695
[1]	696	!
	697	!-- Calculate the index height of the topography
	698	DO i = 0, nx
	699	DO j = 0, ny
[1675]	700	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	701	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	702	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	703	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	704	ENDDO
	705	ENDDO
[818]	706
	707	DEALLOCATE ( topo_height )
[114]	708	!
[759]	709	!-- Add cyclic boundaries (additional layers are for calculating
	710	!-- flag arrays needed for the multigrid sover)
[114]	711	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	712	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	713	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	714	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	715
[1]	716	CASE DEFAULT
	717	!
	718	!-- The DEFAULT case is reached either if the parameter topography
[217]	719	!-- contains a wrong character string or if the user has defined a special
[1]	720	!-- case in the user interface. There, the subroutine user_init_grid
	721	!-- checks which of these two conditions applies.
[114]	722	CALL user_init_grid( gls, nzb_local )
[1]	723
	724	END SELECT
	725	!
[861]	726	!-- Determine the maximum level of topography. Furthermore it is used for
	727	!-- steering the degradation of order of the applied advection scheme.
[978]	728	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	729	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	730	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	731	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[978]	732	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	733	nzb_max = nzt
	734	ENDIF
	735
[861]	736	!
[1]	737	!-- Consistency checks and index array initialization are only required for
[217]	738	!-- non-flat topography, also the initialization of topography height arrays
[49]	739	!-- zu_s_inner and zw_w_inner
[1]	740	IF ( TRIM( topography ) /= 'flat' ) THEN
	741
	742	!
	743	!-- Consistency checks
	744	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	745	WRITE( message_string, * ) 'nzb_local values are outside the', &
	746	'model domain', &
	747	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	748	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	749	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	750	ENDIF
	751
[722]	752	IF ( bc_lr == 'cyclic' ) THEN
[1353]	753	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	754	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	755	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	756	' boundary condition in x-direction'
	757	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	758	ENDIF
	759	ENDIF
[722]	760	IF ( bc_ns == 'cyclic' ) THEN
[1353]	761	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	762	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	763	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	764	' boundary condition in y-direction'
	765	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	766	ENDIF
	767	ENDIF
	768
[217]	769	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	770	!
[217]	771	!-- The array nzb_local as defined using the 'cell_edge' convention
	772	!-- describes the actual total size of topography which is defined at the
	773	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	774	!-- on the topography walls in y-direction. However, PALM uses individual
	775	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	776	!-- Therefore, the extent of topography in nzb_local is now reduced by
	777	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	778	!-- to form the basis for nzb_s_inner.
	779	DO j = -gls, ny + gls
	780	DO i = -gls, nx
	781	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	782	ENDDO
[134]	783	ENDDO
[217]	784	!-- apply cyclic boundary conditions in x-direction
	785	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	786	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	787	DO i = -gls, nx + gls
	788	DO j = -gls, ny
	789	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	790	ENDDO
[134]	791	ENDDO
[217]	792	!-- apply cyclic boundary conditions in y-direction
	793	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	794	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	795	ENDIF
[134]	796
[1]	797	!
	798	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	799	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	800	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	801
	802	!
	803	!-- Initialize remaining index arrays:
	804	!-- first pre-initialize them with nzb_s_inner...
	805	nzb_u_inner = nzb_s_inner
	806	nzb_u_outer = nzb_s_inner
	807	nzb_v_inner = nzb_s_inner
	808	nzb_v_outer = nzb_s_inner
	809	nzb_w_outer = nzb_s_inner
	810	nzb_s_outer = nzb_s_inner
	811
	812	!
	813	!-- ...then extend pre-initialized arrays in their according directions
	814	!-- based on nzb_local using nzb_tmp as a temporary global index array
	815
	816	!
	817	!-- nzb_s_outer:
	818	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	819	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	820	DO j = -1, ny + 1
	821	DO i = 0, nx
[1353]	822	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	823	nzb_local(j,i+1) )
	824	ENDDO
	825	ENDDO
	826	DO i = nxl, nxr
	827	DO j = nys, nyn
[1353]	828	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	829	nzb_tmp(j+1,i) )
	830	ENDDO
	831	!
	832	!-- non-cyclic boundary conditions (overwritten by call of
	833	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	834	IF ( nys == 0 ) THEN
	835	j = -1
	836	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	837	ENDIF
	838	IF ( nys == ny ) THEN
	839	j = ny + 1
	840	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	841	ENDIF
	842	ENDDO
	843	!
	844	!-- nzb_w_outer:
	845	!-- identical to nzb_s_outer
	846	nzb_w_outer = nzb_s_outer
	847
	848	!
	849	!-- nzb_u_inner:
	850	!-- extend nzb_local rightwards only
[667]	851	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	852	DO j = -1, ny + 1
	853	DO i = 0, nx + 1
	854	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	855	ENDDO
	856	ENDDO
[667]	857	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	858
	859	!
	860	!-- nzb_u_outer:
	861	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	862	DO i = nxl, nxr
	863	DO j = nys, nyn
[1353]	864	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	865	nzb_tmp(j+1,i) )
	866	ENDDO
	867	!
	868	!-- non-cyclic boundary conditions (overwritten by call of
	869	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	870	IF ( nys == 0 ) THEN
	871	j = -1
	872	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	873	ENDIF
	874	IF ( nys == ny ) THEN
	875	j = ny + 1
	876	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	877	ENDIF
	878	ENDDO
	879
	880	!
	881	!-- nzb_v_inner:
	882	!-- extend nzb_local northwards only
[667]	883	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	884	DO i = -1, nx + 1
	885	DO j = 0, ny + 1
	886	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	887	ENDDO
	888	ENDDO
[667]	889	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	890
	891	!
	892	!-- nzb_v_outer:
	893	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	894	DO j = nys, nyn
	895	DO i = nxl, nxr
[1353]	896	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	897	nzb_tmp(j,i+1) )
	898	ENDDO
	899	!
	900	!-- non-cyclic boundary conditions (overwritten by call of
	901	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	902	IF ( nxl == 0 ) THEN
	903	i = -1
	904	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	905	ENDIF
	906	IF ( nxr == nx ) THEN
	907	i = nx + 1
	908	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	909	ENDIF
	910	ENDDO
[809]	911	#if ! defined ( __check )
[1]	912	!
	913	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	914	!-- boundary conditions, if applicable.
	915	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	916	!-- they do not require exchange and are not included here.
	917	CALL exchange_horiz_2d_int( nzb_u_inner )
	918	CALL exchange_horiz_2d_int( nzb_u_outer )
	919	CALL exchange_horiz_2d_int( nzb_v_inner )
	920	CALL exchange_horiz_2d_int( nzb_v_outer )
	921	CALL exchange_horiz_2d_int( nzb_w_outer )
	922	CALL exchange_horiz_2d_int( nzb_s_outer )
	923
[49]	924	!
	925	!-- Allocate and set the arrays containing the topography height
	926	IF ( myid == 0 ) THEN
	927
	928	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	929
	930	DO i = 0, nx + 1
	931	DO j = 0, ny + 1
	932	zu_s_inner(i,j) = zu(nzb_local(j,i))
	933	zw_w_inner(i,j) = zw(nzb_local(j,i))
	934	ENDDO
	935	ENDDO
	936
	937	ENDIF
[1221]	938	!
	939	!-- Set flag arrays to be used for masking of grid points
	940	DO i = nxlg, nxrg
	941	DO j = nysg, nyng
	942	DO k = nzb, nzt+1
[1353]	943	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	944	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	945	ENDDO
	946	ENDDO
	947	ENDDO
[807]	948	#endif
[1]	949	ENDIF
	950
[809]	951	#if ! defined ( __check )
[1]	952	!
	953	!-- Preliminary: to be removed after completion of the topography code!
	954	!-- Set the former default k index arrays nzb_2d
	955	nzb_2d = nzb
	956
	957	!
	958	!-- Set the individual index arrays which define the k index from which on
	959	!-- the usual finite difference form (which does not use surface fluxes) is
	960	!-- applied
[1691]	961	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	962	nzb_diff_u = nzb_u_inner + 2
	963	nzb_diff_v = nzb_v_inner + 2
	964	nzb_diff_s_inner = nzb_s_inner + 2
	965	nzb_diff_s_outer = nzb_s_outer + 2
	966	ELSE
	967	nzb_diff_u = nzb_u_inner + 1
	968	nzb_diff_v = nzb_v_inner + 1
	969	nzb_diff_s_inner = nzb_s_inner + 1
	970	nzb_diff_s_outer = nzb_s_outer + 1
	971	ENDIF
	972
	973	!
	974	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	975	!-- for limitation of near-wall mixing length l_wall further below
	976	corner_nl = 0
	977	corner_nr = 0
	978	corner_sl = 0
	979	corner_sr = 0
	980	wall_l = 0
	981	wall_n = 0
	982	wall_r = 0
	983	wall_s = 0
	984
	985	DO i = nxl, nxr
	986	DO j = nys, nyn
	987	!
	988	!-- u-component
	989	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	990	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	991	fym(j,i) = 0.0_wp
	992	fyp(j,i) = 1.0_wp
[1]	993	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	994	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	995	fym(j,i) = 1.0_wp
	996	fyp(j,i) = 0.0_wp
[1]	997	ENDIF
	998	!
	999	!-- v-component
	1000	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1001	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1002	fxm(j,i) = 0.0_wp
	1003	fxp(j,i) = 1.0_wp
[1]	1004	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1005	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1006	fxm(j,i) = 1.0_wp
	1007	fxp(j,i) = 0.0_wp
[1]	1008	ENDIF
	1009	!
	1010	!-- w-component, also used for scalars, separate arrays for shear
	1011	!-- production of tke
	1012	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1013	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1014	wall_w_y(j,i) = 1.0_wp
	1015	fwym(j,i) = 0.0_wp
	1016	fwyp(j,i) = 1.0_wp
[1]	1017	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1018	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1019	wall_w_y(j,i) = 1.0_wp
	1020	fwym(j,i) = 1.0_wp
	1021	fwyp(j,i) = 0.0_wp
[1]	1022	ENDIF
	1023	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1024	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1025	wall_w_x(j,i) = 1.0_wp
	1026	fwxm(j,i) = 0.0_wp
	1027	fwxp(j,i) = 1.0_wp
[1]	1028	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1029	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1030	wall_w_x(j,i) = 1.0_wp
	1031	fwxm(j,i) = 1.0_wp
	1032	fwxp(j,i) = 0.0_wp
[1]	1033	ENDIF
	1034	!
	1035	!-- Wall and corner locations inside buildings for limitation of
	1036	!-- near-wall mixing length l_wall
	1037	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1038
	1039	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1040
	1041	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1042	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1043	nzb_s_inner(j,i-1) ) + 1
	1044	ENDIF
	1045
	1046	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1047	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1048	nzb_s_inner(j,i+1) ) + 1
	1049	ENDIF
	1050
	1051	ENDIF
	1052
	1053	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1054
	1055	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1056	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1057	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1058	nzb_s_inner(j,i-1) ) + 1
	1059	ENDIF
	1060
	1061	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1062	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1063	nzb_s_inner(j,i+1) ) + 1
	1064	ENDIF
	1065
	1066	ENDIF
	1067
	1068	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1069	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1070	ENDIF
	1071
	1072	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1073	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1074	ENDIF
	1075
	1076	ENDDO
	1077	ENDDO
	1078
	1079	!
[114]	1080	!-- Calculate wall flag arrays for the multigrid method
[1575]	1081	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1082	!
	1083	!-- Gridpoint increment of the current level
	1084	inc = 1
	1085
	1086	DO l = maximum_grid_level, 1 , -1
	1087
	1088	nxl_l = nxl_mg(l)
	1089	nxr_l = nxr_mg(l)
	1090	nys_l = nys_mg(l)
	1091	nyn_l = nyn_mg(l)
	1092	nzt_l = nzt_mg(l)
	1093
	1094	!
	1095	!-- Assign the flag level to be calculated
	1096	SELECT CASE ( l )
	1097	CASE ( 1 )
	1098	flags => wall_flags_1
	1099	CASE ( 2 )
	1100	flags => wall_flags_2
	1101	CASE ( 3 )
	1102	flags => wall_flags_3
	1103	CASE ( 4 )
	1104	flags => wall_flags_4
	1105	CASE ( 5 )
	1106	flags => wall_flags_5
	1107	CASE ( 6 )
	1108	flags => wall_flags_6
	1109	CASE ( 7 )
	1110	flags => wall_flags_7
	1111	CASE ( 8 )
	1112	flags => wall_flags_8
	1113	CASE ( 9 )
	1114	flags => wall_flags_9
	1115	CASE ( 10 )
	1116	flags => wall_flags_10
	1117	END SELECT
	1118
	1119	!
	1120	!-- Depending on the grid level, set the respective bits in case of
	1121	!-- neighbouring walls
	1122	!-- Bit 0: wall to the bottom
	1123	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1124	!-- Bit 2: wall to the south
	1125	!-- Bit 3: wall to the north
	1126	!-- Bit 4: wall to the left
	1127	!-- Bit 5: wall to the right
[116]	1128	!-- Bit 6: inside building
[114]	1129
	1130	flags = 0
	1131
[927]	1132	!
	1133	!-- In case of masking method, flags are not set and multigrid method
	1134	!-- works like FFT-solver
	1135	IF ( .NOT. masking_method ) THEN
	1136
	1137	DO i = nxl_l-1, nxr_l+1
	1138	DO j = nys_l-1, nyn_l+1
	1139	DO k = nzb, nzt_l+1
[114]	1140
	1141	!
[927]	1142	!-- Inside/outside building (inside building does not need
	1143	!-- further tests for walls)
	1144	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1145
[927]	1146	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1147
[927]	1148	ELSE
[114]	1149	!
[927]	1150	!-- Bottom wall
	1151	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1152	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1153	ENDIF
[114]	1154	!
[927]	1155	!-- South wall
	1156	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1157	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1158	ENDIF
[114]	1159	!
[927]	1160	!-- North wall
	1161	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1162	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1163	ENDIF
[114]	1164	!
[927]	1165	!-- Left wall
	1166	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1167	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1168	ENDIF
[114]	1169	!
[927]	1170	!-- Right wall
	1171	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1172	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1173	ENDIF
	1174
[114]	1175	ENDIF
	1176
[927]	1177	ENDDO
[114]	1178	ENDDO
	1179	ENDDO
	1180
[927]	1181	ENDIF
	1182
[114]	1183	!
	1184	!-- Test output of flag arrays
[145]	1185	! i = nxl_l
	1186	! WRITE (9,*) ' '
	1187	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1188	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1189	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1190	! DO k = nzt_l+1, nzb, -1
	1191	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1192	! ENDDO
[114]	1193
	1194	inc = inc * 2
	1195
	1196	ENDDO
	1197
	1198	ENDIF
[861]	1199	!
	1200	!-- Allocate flags needed for masking walls.
[1677]	1201	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1202	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1203	wall_flags_0 = 0
	1204	wall_flags_00 = 0
[114]	1205
[1557]	1206	IF ( scalar_advec == 'ws-scheme' .OR. &
	1207	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1208	!
[861]	1209	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1210	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1211	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1212	!-- grid points.
	1213	DO i = nxl, nxr
	1214	DO j = nys, nyn
	1215	DO k = nzb_s_inner(j,i)+1, nzt
	1216	!
	1217	!-- scalar - x-direction
	1218	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1219	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1220	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1221	.AND. i == nxr ) ) THEN
[861]	1222	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1223	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1224	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1225	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1226	) THEN
[861]	1227	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1228	ELSE
	1229	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1230	ENDIF
	1231	!
	1232	!-- scalar - y-direction
	1233	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1234	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1235	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1236	.AND. j == nyn ) ) THEN
[861]	1237	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1238	!-- WS3
	1239	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1240	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1241	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1242	) THEN
[861]	1243	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1244	!-- WS5
	1245	ELSE
	1246	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1247	ENDIF
	1248	!
	1249	!-- scalar - z-direction
	1250	!-- WS1 (6), WS3 (7), WS5 (8)
	1251	flag_set = .FALSE.
	1252	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1253	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1254	flag_set = .TRUE.
	1255	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1256	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1257	flag_set = .TRUE.
	1258	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1259	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1260	ENDIF
	1261	ENDDO
	1262	ENDDO
	1263	ENDDO
	1264	ENDIF
	1265
	1266	IF ( momentum_advec == 'ws-scheme' ) THEN
	1267	!
	1268	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1269	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1270	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1271	!-- grid points.
	1272	DO i = nxl, nxr
	1273	DO j = nys, nyn
[1580]	1274	DO k = nzb+1, nzt
[861]	1275	!
[1580]	1276	!-- At first, set flags to WS1.
	1277	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1278	!-- in order to handle the left/south flux.
	1279	!-- near vertical walls.
	1280	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1281	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1282	!
[861]	1283	!-- u component - x-direction
	1284	!-- WS1 (9), WS3 (10), WS5 (11)
	1285	IF ( k <= nzb_u_inner(j,i+1) &
[1409]	1286	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
[978]	1287	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1288	) THEN
[1580]	1289	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[861]	1290	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1291	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1292	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1293	) THEN
[861]	1294	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1295	!
	1296	!-- Clear flag for WS1
	1297	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1298	ELSE
	1299	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1300	!
	1301	!-- Clear flag for WS1
	1302	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1303	ENDIF
	1304	!
	1305	!-- u component - y-direction
	1306	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1307	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1308	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1309	.AND. j == nyn ) ) THEN
[1580]	1310	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1311	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1312	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1313	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1314	) THEN
[861]	1315	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1316	!
	1317	!-- Clear flag for WS1
	1318	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1319	ELSE
	1320	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1321	!
	1322	!-- Clear flag for WS1
	1323	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1324	ENDIF
	1325	!
	1326	!-- u component - z-direction
	1327	!-- WS1 (15), WS3 (16), WS5 (17)
	1328	flag_set = .FALSE.
	1329	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1330	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1331	flag_set = .TRUE.
	1332	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1333	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1334	flag_set = .TRUE.
	1335	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1336	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1337	ENDIF
	1338
	1339	ENDDO
	1340	ENDDO
	1341	ENDDO
	1342
	1343	DO i = nxl, nxr
	1344	DO j = nys, nyn
[1580]	1345	DO k = nzb+1, nzt
[861]	1346	!
[1580]	1347	!-- At first, set flags to WS1.
	1348	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1349	!-- in order to handle the left/south flux.
	1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1351	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1352	!
[861]	1353	!-- v component - x-direction
	1354	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1355	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1356	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1357	.AND. i == nxr ) ) THEN
[1580]	1358	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
[861]	1359	!-- WS3
	1360	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1361	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1362	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1363	) THEN
[861]	1364	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1365	!
	1366	!-- Clear flag for WS1
	1367	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1368	ELSE
	1369	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1370	!
	1371	!-- Clear flag for WS1
	1372	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1373	ENDIF
	1374	!
	1375	!-- v component - y-direction
	1376	!-- WS1 (21), WS3 (22), WS5 (23)
	1377	IF ( k <= nzb_v_inner(j+1,i) &
[1409]	1378	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
[978]	1379	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1380	) THEN
[1580]	1381	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1382	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1383	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1384	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1385	) THEN
[861]	1386	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1387	!
	1388	!-- Clear flag for WS1
	1389	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1390	ELSE
	1391	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1392	!
	1393	!-- Clear flag for WS1
	1394	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1395	ENDIF
	1396	!
	1397	!-- v component - z-direction
	1398	!-- WS1 (24), WS3 (25), WS5 (26)
	1399	flag_set = .FALSE.
	1400	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1401	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1402	flag_set = .TRUE.
	1403	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1404	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1405	flag_set = .TRUE.
	1406	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1407	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1408	ENDIF
	1409
	1410	ENDDO
	1411	ENDDO
	1412	ENDDO
	1413	DO i = nxl, nxr
	1414	DO j = nys, nyn
[1580]	1415	DO k = nzb+1, nzt
[861]	1416	!
[1580]	1417	!-- At first, set flags to WS1.
	1418	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1419	!-- in order to handle the left/south flux.
	1420	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1421	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1422	!
[861]	1423	!-- w component - x-direction
	1424	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1425	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1426	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1427	.AND. i == nxr ) ) THEN
[1580]	1428	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1429	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1430	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1431	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1432	) THEN
[861]	1433	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1434	!
	1435	!-- Clear flag for WS1
	1436	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1437	ELSE
	1438	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1439	!
	1440	!-- Clear flag for WS1
	1441	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1442	ENDIF
	1443	!
	1444	!-- w component - y-direction
	1445	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1446	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1447	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1448	.AND. j == nyn ) ) THEN
[1580]	1449	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1450	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1451	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1452	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1453	) THEN
[861]	1454	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1455	!
	1456	!-- Clear flag for WS1
	1457	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1458	ELSE
[1221]	1459	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1460	!
	1461	!-- Clear flag for WS1
	1462	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1463	ENDIF
	1464	!
	1465	!-- w component - z-direction
[1679]	1466	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1467	flag_set = .FALSE.
	1468	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1469	.OR. k == nzt ) THEN
	1470	!
	1471	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1472	!-- set, although this is not a prognostic level. However,
	1473	!-- contrary to the advection of u,v and s this is necessary
	1474	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1475	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1476	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1477	flag_set = .TRUE.
	1478	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1479	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1480	flag_set = .TRUE.
	1481	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1482	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1483	ENDIF
	1484
	1485	ENDDO
	1486	ENDDO
	1487	ENDDO
	1488
	1489	ENDIF
	1490
	1491	!
[1677]	1492	!-- Exchange 3D integer wall_flags.
	1493	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1494	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1495	!
	1496	!-- Exchange ghost points for advection flags
	1497	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1498	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1499	!
	1500	!-- Set boundary flags at inflow and outflow boundary in case of
	1501	!-- non-cyclic boundary conditions.
	1502	IF ( inflow_l .OR. outflow_l ) THEN
	1503	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1504	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1505	ENDIF
	1506
	1507	IF ( inflow_r .OR. outflow_r ) THEN
	1508	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1509	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1510	ENDIF
	1511
	1512	IF ( inflow_n .OR. outflow_n ) THEN
	1513	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1514	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1515	ENDIF
	1516
	1517	IF ( inflow_s .OR. outflow_s ) THEN
	1518	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1519	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1520	ENDIF
	1521
	1522	ENDIF
	1523
	1524	!
[1]	1525	!-- In case of topography: limit near-wall mixing length l_wall further:
	1526	!-- Go through all points of the subdomain one by one and look for the closest
	1527	!-- surface
	1528	IF ( TRIM(topography) /= 'flat' ) THEN
	1529	DO i = nxl, nxr
	1530	DO j = nys, nyn
	1531
	1532	nzb_si = nzb_s_inner(j,i)
	1533	vi = vertical_influence(nzb_si)
	1534
	1535	IF ( wall_n(j,i) > 0 ) THEN
	1536	!
	1537	!-- North wall (y distance)
	1538	DO k = wall_n(j,i), nzb_si
[1353]	1539	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1540	ENDDO
	1541	!
	1542	!-- Above North wall (yz distance)
	1543	DO k = nzb_si + 1, nzb_si + vi
[1353]	1544	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1545	SQRT( 0.25_wp * dy**2 + &
[1]	1546	( zu(k) - zw(nzb_si) )**2 ) )
	1547	ENDDO
	1548	!
	1549	!-- Northleft corner (xy distance)
	1550	IF ( corner_nl(j,i) > 0 ) THEN
	1551	DO k = corner_nl(j,i), nzb_si
	1552	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1553	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1554	ENDDO
	1555	!
	1556	!-- Above Northleft corner (xyz distance)
	1557	DO k = nzb_si + 1, nzb_si + vi
[1353]	1558	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1559	SQRT( 0.25_wp * (dx2 + dy2) + &
	1560	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1561	ENDDO
	1562	ENDIF
	1563	!
	1564	!-- Northright corner (xy distance)
	1565	IF ( corner_nr(j,i) > 0 ) THEN
	1566	DO k = corner_nr(j,i), nzb_si
[1353]	1567	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1568	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1569	ENDDO
	1570	!
	1571	!-- Above northright corner (xyz distance)
	1572	DO k = nzb_si + 1, nzb_si + vi
[1353]	1573	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1574	SQRT( 0.25_wp * (dx2 + dy2) + &
	1575	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1576	ENDDO
	1577	ENDIF
	1578	ENDIF
	1579
	1580	IF ( wall_s(j,i) > 0 ) THEN
	1581	!
	1582	!-- South wall (y distance)
	1583	DO k = wall_s(j,i), nzb_si
[1353]	1584	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1585	ENDDO
	1586	!
	1587	!-- Above south wall (yz distance)
[1353]	1588	DO k = nzb_si + 1, nzb_si + vi
	1589	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1590	SQRT( 0.25_wp * dy**2 + &
[1]	1591	( zu(k) - zw(nzb_si) )**2 ) )
	1592	ENDDO
	1593	!
	1594	!-- Southleft corner (xy distance)
	1595	IF ( corner_sl(j,i) > 0 ) THEN
	1596	DO k = corner_sl(j,i), nzb_si
[1353]	1597	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1598	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1599	ENDDO
	1600	!
	1601	!-- Above southleft corner (xyz distance)
	1602	DO k = nzb_si + 1, nzb_si + vi
[1353]	1603	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1604	SQRT( 0.25_wp * (dx2 + dy2) + &
	1605	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1606	ENDDO
	1607	ENDIF
	1608	!
	1609	!-- Southright corner (xy distance)
	1610	IF ( corner_sr(j,i) > 0 ) THEN
	1611	DO k = corner_sr(j,i), nzb_si
[1353]	1612	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1613	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1614	ENDDO
	1615	!
	1616	!-- Above southright corner (xyz distance)
	1617	DO k = nzb_si + 1, nzb_si + vi
[1353]	1618	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1619	SQRT( 0.25_wp * (dx2 + dy2) + &
	1620	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1621	ENDDO
	1622	ENDIF
	1623
	1624	ENDIF
	1625
	1626	IF ( wall_l(j,i) > 0 ) THEN
	1627	!
	1628	!-- Left wall (x distance)
	1629	DO k = wall_l(j,i), nzb_si
[1353]	1630	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1631	ENDDO
	1632	!
	1633	!-- Above left wall (xz distance)
	1634	DO k = nzb_si + 1, nzb_si + vi
[1353]	1635	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1636	SQRT( 0.25_wp * dx**2 + &
	1637	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1638	ENDDO
	1639	ENDIF
	1640
	1641	IF ( wall_r(j,i) > 0 ) THEN
	1642	!
	1643	!-- Right wall (x distance)
	1644	DO k = wall_r(j,i), nzb_si
[1353]	1645	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1646	ENDDO
	1647	!
	1648	!-- Above right wall (xz distance)
	1649	DO k = nzb_si + 1, nzb_si + vi
[1353]	1650	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1651	SQRT( 0.25_wp * dx**2 + &
[1]	1652	( zu(k) - zw(nzb_si) )**2 ) )
	1653	ENDDO
	1654
	1655	ENDIF
	1656
	1657	ENDDO
	1658	ENDDO
	1659
	1660	ENDIF
	1661
	1662	!
	1663	!-- Multiplication with wall_adjustment_factor
	1664	l_wall = wall_adjustment_factor * l_wall
	1665
	1666	!
[709]	1667	!-- Set lateral boundary conditions for l_wall
[667]	1668	CALL exchange_horiz( l_wall, nbgp )
	1669
[1]	1670	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1671	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1672
[807]	1673	#endif
[1]	1674
	1675	END SUBROUTINE init_grid

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