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source: palm/trunk/SOURCE/init_grid.f90 @ 1683

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

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