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source: palm/trunk/SOURCE/init_grid.f90 @ 1743

Last change on this file since 1743 was 1743, checked in by raasch, 8 years ago
Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of total domain
Property svn:keywords set to `Id`
File size: 65.2 KB

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[1682]	1	!> @file init_grid.f90
[1743]	2	!-------------------------------------------------------------------------------!
[1036]	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
[1743]	17	!-------------------------------------------------------------------------------!
[1036]	18	!
[254]	19	! Current revisions:
[1]	20	! -----------------
[1743]	21	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	22	! total domain
[1581]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1743 2016-01-13 10:23:51Z raasch $
	27	!
[1692]	28	! 1691 2015-10-26 16:17:44Z maronga
	29	! Renamed prandtl_layer to constant_flux_layer.
	30	!
[1683]	31	! 1682 2015-10-07 23:56:08Z knoop
	32	! Code annotations made doxygen readable
	33	!
[1678]	34	! 1677 2015-10-02 13:25:23Z boeske
	35	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	36	!
[1676]	37	! 1675 2015-10-02 08:28:59Z gronemeier
	38	! Bugfix: Definition of topography grid levels
	39	!
[1662]	40	! 1660 2015-09-21 08:15:16Z gronemeier
	41	! Bugfix: Definition of topography grid levels if vertical grid stretching
	42	! starts below the maximum topography height.
	43	!
[1581]	44	! 1580 2015-04-10 13:43:49Z suehring
	45	! Bugfix: setting flags for 5th order scheme near buildings
	46	!
[1576]	47	! 1575 2015-03-27 09:56:27Z raasch
	48	! adjustments for psolver-queries
	49	!
[1558]	50	! 1557 2015-03-05 16:43:04Z suehring
	51	! Adjustment for monotoinic limiter
	52	!
[1419]	53	! 1418 2014-06-06 13:05:08Z fricke
	54	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	55	! condition and a negative value for dz_stretch_level the condition
	56	! was always true for the whole model domain
	57	!
[1410]	58	! 1409 2014-05-23 12:11:32Z suehring
	59	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	60	! j <= nysv
	61	!
[1354]	62	! 1353 2014-04-08 15:21:23Z heinze
	63	! REAL constants provided with KIND-attribute
	64	!
[1323]	65	! 1322 2014-03-20 16:38:49Z raasch
	66	! REAL constants defined as wp-kind
	67	!
[1321]	68	! 1320 2014-03-20 08:40:49Z raasch
[1320]	69	! ONLY-attribute added to USE-statements,
	70	! kind-parameters added to all INTEGER and REAL declaration statements,
	71	! kinds are defined in new module kinds,
	72	! revision history before 2012 removed,
	73	! comment fields (!:) to be used for variable explanations added to
	74	! all variable declaration statements
[1321]	75	!
[1222]	76	! 1221 2013-09-10 08:59:13Z raasch
	77	! wall_flags_00 introduced to hold bits 32-63,
	78	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	79	! loops optimized for openACC (pres + flow_statistics)
	80	!
[1093]	81	! 1092 2013-02-02 11:24:22Z raasch
	82	! unused variables removed
	83	!
[1070]	84	! 1069 2012-11-28 16:18:43Z maronga
	85	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	86	! model in case of coupled runs
	87	!
[1037]	88	! 1036 2012-10-22 13:43:42Z raasch
	89	! code put under GPL (PALM 3.9)
	90	!
[1017]	91	! 1015 2012-09-27 09:23:24Z raasch
	92	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	93	! nzb_w_inner+1
	94	!
[997]	95	! 996 2012-09-07 10:41:47Z raasch
	96	! little reformatting
	97	!
[979]	98	! 978 2012-08-09 08:28:32Z fricke
	99	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	100	! Bugfix: Set wall_flags_0 for inflow boundary
	101	!
[928]	102	! 927 2012-06-06 19:15:04Z raasch
	103	! Wall flags are not set for multigrid method in case of masking method
	104	!
[865]	105	! 864 2012-03-27 15:10:33Z gryschka
[927]	106	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	107	! were not correctly defined for k=1.
[865]	108	!
[863]	109	! 861 2012-03-26 14:18:34Z suehring
[861]	110	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	111	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	112	! model domain.!
[861]	113	! Initialization of nzb_s_inner and nzb_w_inner.
	114	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	115	! while setting wall_flags_0
	116	!
[844]	117	! 843 2012-02-29 15:16:21Z gryschka
	118	! In case of ocean and dirichlet bc for u and v at the bottom
	119	! the first u-level ist defined at same height as the first w-level
	120	!
[819]	121	! 818 2012-02-08 16:11:23Z maronga
	122	! Bugfix: topo_height is only required if topography is used. It is thus now
	123	! allocated in the topography branch
	124	!
[810]	125	! 809 2012-01-30 13:32:58Z maronga
	126	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	127	!
[808]	128	! 807 2012-01-25 11:53:51Z maronga
	129	! New cpp directive "__check" implemented which is used by check_namelist_files
	130	!
[1]	131	! Revision 1.1 1997/08/11 06:17:45 raasch
	132	! Initial revision (Testversion)
	133	!
	134	!
	135	! Description:
	136	! ------------
[1682]	137	!> Creating grid depending constants
[1]	138	!------------------------------------------------------------------------------!
[1682]	139	SUBROUTINE init_grid
	140
[1]	141
[1320]	142	USE arrays_3d, &
	143	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	144	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	145
[1353]	146	USE control_parameters, &
[1320]	147	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	148	building_length_y, building_wall_left, building_wall_south, &
	149	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	150	canyon_width_x, canyon_width_y, constant_flux_layer, &
	151	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	152	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	153	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	154	masking_method, maximum_grid_level, message_string, &
	155	momentum_advec, ocean, outflow_l, outflow_n, outflow_r, &
	156	outflow_s, psolver, scalar_advec, topography, &
	157	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	158	wall_adjustment_factor
[1320]	159
	160	USE grid_variables, &
	161	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	162	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	163	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	164
	165	USE indices, &
	166	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	167	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	168	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	169	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	170	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	171	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	172	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	173	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	174	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	175	wall_flags_9
	176
	177	USE kinds
	178
[1]	179	USE pegrid
	180
	181	IMPLICIT NONE
	182
[1682]	183	INTEGER(iwp) :: bh !<
	184	INTEGER(iwp) :: blx !<
	185	INTEGER(iwp) :: bly !<
	186	INTEGER(iwp) :: bxl !<
	187	INTEGER(iwp) :: bxr !<
	188	INTEGER(iwp) :: byn !<
	189	INTEGER(iwp) :: bys !<
	190	INTEGER(iwp) :: ch !<
	191	INTEGER(iwp) :: cwx !<
	192	INTEGER(iwp) :: cwy !<
	193	INTEGER(iwp) :: cxl !<
	194	INTEGER(iwp) :: cxr !<
	195	INTEGER(iwp) :: cyn !<
	196	INTEGER(iwp) :: cys !<
	197	INTEGER(iwp) :: gls !<
	198	INTEGER(iwp) :: i !<
	199	INTEGER(iwp) :: ii !<
	200	INTEGER(iwp) :: inc !<
	201	INTEGER(iwp) :: j !<
	202	INTEGER(iwp) :: k !<
	203	INTEGER(iwp) :: l !<
	204	INTEGER(iwp) :: nxl_l !<
	205	INTEGER(iwp) :: nxr_l !<
	206	INTEGER(iwp) :: nyn_l !<
	207	INTEGER(iwp) :: nys_l !<
	208	INTEGER(iwp) :: nzb_si !<
	209	INTEGER(iwp) :: nzt_l !<
	210	INTEGER(iwp) :: vi !<
[1]	211
[1682]	212	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
[1]	213
[1682]	214	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
	215	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
	216	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
	217	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
	218	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
	219	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
	220	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
	221	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
	222	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
	223	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
[1]	224
[1682]	225	LOGICAL :: flag_set = .FALSE. !<
[861]	226
[1682]	227	REAL(wp) :: dx_l !<
	228	REAL(wp) :: dy_l !<
	229	REAL(wp) :: dz_stretched !<
[1]	230
[1682]	231	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
[1]	232
[667]	233
[1]	234	!
[709]	235	!-- Calculation of horizontal array bounds including ghost layers
[667]	236	nxlg = nxl - nbgp
	237	nxrg = nxr + nbgp
	238	nysg = nys - nbgp
	239	nyng = nyn + nbgp
[709]	240
[667]	241	!
[1]	242	!-- Allocate grid arrays
[1353]	243	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	244	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	245
	246	!
	247	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	248	IF ( dz == -1.0_wp ) THEN
[254]	249	message_string = 'missing dz'
	250	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	251	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	252	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	253	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	254	ENDIF
[94]	255
[1]	256	!
[94]	257	!-- Define the vertical grid levels
	258	IF ( .NOT. ocean ) THEN
	259	!
	260	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	261	!-- The second u-level (k=1) corresponds to the top of the
[94]	262	!-- Prandtl-layer.
[667]	263
	264	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	265	zu(0) = 0.0_wp
	266	! zu(0) = - dz * 0.5_wp
[667]	267	ELSE
[1353]	268	zu(0) = - dz * 0.5_wp
[667]	269	ENDIF
[1353]	270	zu(1) = dz * 0.5_wp
[1]	271
[94]	272	dz_stretch_level_index = nzt+1
	273	dz_stretched = dz
	274	DO k = 2, nzt+1
	275	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	276	dz_stretched = dz_stretched * dz_stretch_factor
	277	dz_stretched = MIN( dz_stretched, dz_max )
	278	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	279	ENDIF
	280	zu(k) = zu(k-1) + dz_stretched
	281	ENDDO
[1]	282
	283	!
[94]	284	!-- Compute the w-levels. They are always staggered half-way between the
[843]	285	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	286	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	287	!-- The top w-level is extrapolated linearly.
[1353]	288	zw(0) = 0.0_wp
[94]	289	DO k = 1, nzt
[1353]	290	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	291	ENDDO
[1353]	292	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	293
[94]	294	ELSE
[1]	295	!
[843]	296	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	297	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	298	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	299	!-- w-level are defined at same height, but staggered from the second level.
	300	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	301	zu(nzt+1) = dz * 0.5_wp
	302	zu(nzt) = - dz * 0.5_wp
[94]	303
	304	dz_stretch_level_index = 0
	305	dz_stretched = dz
	306	DO k = nzt-1, 0, -1
[1418]	307	!
	308	!-- The default value of dz_stretch_level is positive, thus the first
	309	!-- condition is always true. Hence, the second condition is necessary.
	310	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	311	.AND. dz_stretched < dz_max ) THEN
[94]	312	dz_stretched = dz_stretched * dz_stretch_factor
	313	dz_stretched = MIN( dz_stretched, dz_max )
	314	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	315	ENDIF
	316	zu(k) = zu(k+1) - dz_stretched
	317	ENDDO
	318
	319	!
	320	!-- Compute the w-levels. They are always staggered half-way between the
[843]	321	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	322	!-- at the ground. In this case the first u- and w-level are defined at
	323	!-- same height. The top w-level (nzt+1) is not used but set for
	324	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	325	zw(nzt+1) = dz
[1353]	326	zw(nzt) = 0.0_wp
[94]	327	DO k = 0, nzt
[1353]	328	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	329	ENDDO
	330
[843]	331	!
	332	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	333	!-- at same height.
	334	IF ( ibc_uv_b == 0 ) THEN
	335	zu(0) = zw(0)
	336	ENDIF
	337
[94]	338	ENDIF
	339
	340	!
[1]	341	!-- Compute grid lengths.
	342	DO k = 1, nzt+1
	343	dzu(k) = zu(k) - zu(k-1)
[1353]	344	ddzu(k) = 1.0_wp / dzu(k)
[1]	345	dzw(k) = zw(k) - zw(k-1)
[1353]	346	ddzw(k) = 1.0_wp / dzw(k)
[1]	347	ENDDO
	348
	349	DO k = 1, nzt
[1353]	350	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	351	ENDDO
[667]	352
	353	!
[709]	354	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	355	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	356	!-- is only dz/2, but should be dz. Therefore, an additional array
	357	!-- containing with appropriate grid information is created for these
	358	!-- solvers.
[1575]	359	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	360	ALLOCATE( ddzu_pres(1:nzt+1) )
	361	ddzu_pres = ddzu
[864]	362	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	363	ENDIF
[1]	364
	365	!
	366	!-- In case of multigrid method, compute grid lengths and grid factors for the
	367	!-- grid levels
[1575]	368	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	369
	370	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	371	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	372	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	373	f1_mg(nzb+1:nzt,maximum_grid_level), &
	374	f2_mg(nzb+1:nzt,maximum_grid_level), &
	375	f3_mg(nzb+1:nzt,maximum_grid_level) )
	376
	377	dzu_mg(:,maximum_grid_level) = dzu
[667]	378	!
[864]	379	!-- Next line to ensure an equally spaced grid.
	380	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	381
[1]	382	dzw_mg(:,maximum_grid_level) = dzw
	383	nzt_l = nzt
	384	DO l = maximum_grid_level-1, 1, -1
[1353]	385	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	386	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	387	nzt_l = nzt_l / 2
	388	DO k = 2, nzt_l+1
	389	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	390	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	391	ENDDO
	392	ENDDO
	393
	394	nzt_l = nzt
	395	dx_l = dx
	396	dy_l = dy
	397	DO l = maximum_grid_level, 1, -1
[1353]	398	ddx2_mg(l) = 1.0_wp / dx_l**2
	399	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	400	DO k = nzb+1, nzt_l
[1353]	401	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	402	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	403	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	404	f2_mg(k,l) + f3_mg(k,l)
	405	ENDDO
	406	nzt_l = nzt_l / 2
[1353]	407	dx_l = dx_l * 2.0_wp
	408	dy_l = dy_l * 2.0_wp
[1]	409	ENDDO
	410
	411	ENDIF
	412
	413	!
	414	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	415	ddx = 1.0_wp / dx
	416	ddy = 1.0_wp / dy
[1]	417	dx2 = dx * dx
	418	dy2 = dy * dy
[1353]	419	ddx2 = 1.0_wp / dx2
	420	ddy2 = 1.0_wp / dy2
[1]	421
	422	!
	423	!-- Compute the grid-dependent mixing length.
	424	DO k = 1, nzt
[1322]	425	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	426	ENDDO
	427
	428	!
	429	!-- Allocate outer and inner index arrays for topography and set
[114]	430	!-- defaults.
	431	!-- nzb_local has to contain additional layers of ghost points for calculating
	432	!-- the flag arrays needed for the multigrid method
	433	gls = 2**( maximum_grid_level )
[861]	434	IF ( gls < nbgp ) gls = nbgp
[667]	435
[114]	436	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	437	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	438	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	439	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	440	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	441	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	442	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	443	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	444	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	445	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	446	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	447	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	448	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	449	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	450	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	451	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	452	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	453	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	454	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	455	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	456	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	457	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	458	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	459	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	460	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	461	wall_e_x(nysg:nyng,nxlg:nxrg), &
	462	wall_e_y(nysg:nyng,nxlg:nxrg), &
	463	wall_u(nysg:nyng,nxlg:nxrg), &
	464	wall_v(nysg:nyng,nxlg:nxrg), &
	465	wall_w_x(nysg:nyng,nxlg:nxrg), &
	466	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	467
	468
[667]	469
	470	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	471
[818]	472
[1]	473	nzb_s_inner = nzb; nzb_s_outer = nzb
	474	nzb_u_inner = nzb; nzb_u_outer = nzb
	475	nzb_v_inner = nzb; nzb_v_outer = nzb
	476	nzb_w_inner = nzb; nzb_w_outer = nzb
	477
[1353]	478	rflags_s_inner = 1.0_wp
	479	rflags_invers = 1.0_wp
[1221]	480
[1]	481	!
[19]	482	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	483	!-- form (which does not use surface fluxes) is applied
[1691]	484	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	485	nzb_diff = nzb + 2
	486	ELSE
	487	nzb_diff = nzb + 1
	488	ENDIF
[19]	489	IF ( use_top_fluxes ) THEN
	490	nzt_diff = nzt - 1
	491	ELSE
	492	nzt_diff = nzt
	493	ENDIF
[1]	494
	495	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	496	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	497
[1353]	498	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	499	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	500	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	501	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	502
	503	!
	504	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	505	!-- for the moment,
	506	!-- multiplication with wall_adjustment_factor near the end of this routine
	507	l_wall(nzb,:,:) = l_grid(1)
	508	DO k = nzb+1, nzt
	509	l_wall(k,:,:) = l_grid(k)
	510	ENDDO
	511	l_wall(nzt+1,:,:) = l_grid(nzt)
	512
	513	ALLOCATE ( vertical_influence(nzb:nzt) )
	514	DO k = 1, nzt
	515	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	516	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	517	ENDDO
	518
	519	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	520	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	521	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	522	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	523	'threshold given by only local', &
	524	' &horizontal reduction of near_wall ', &
	525	'mixing length l_wall', &
	526	' &starting from height level k = ', k, '.'
	527	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	528	EXIT
	529	ENDIF
	530	ENDDO
	531	vertical_influence(0) = vertical_influence(1)
	532
[667]	533	DO i = nxlg, nxrg
	534	DO j = nysg, nyng
[1]	535	DO k = nzb_s_inner(j,i) + 1, &
	536	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	537	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	538	ENDDO
	539	ENDDO
	540	ENDDO
	541
	542	!
	543	!-- Set outer and inner index arrays for non-flat topography.
	544	!-- Here consistency checks concerning domain size and periodicity are
	545	!-- necessary.
	546	!-- Within this SELECT CASE structure only nzb_local is initialized
	547	!-- individually depending on the chosen topography type, all other index
	548	!-- arrays are initialized further below.
	549	SELECT CASE ( TRIM( topography ) )
	550
	551	CASE ( 'flat' )
	552	!
[555]	553	!-- nzb_local is required for the multigrid solver
	554	nzb_local = 0
[1]	555
	556	CASE ( 'single_building' )
	557	!
	558	!-- Single rectangular building, by default centered in the middle of the
	559	!-- total domain
	560	blx = NINT( building_length_x / dx )
	561	bly = NINT( building_length_y / dy )
[1675]	562	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	563	IF ( ABS( zw(bh ) - building_height ) == &
	564	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	565
[1322]	566	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	567	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	568	ENDIF
	569	bxl = NINT( building_wall_left / dx )
	570	bxr = bxl + blx
	571
[1322]	572	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	573	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	574	ENDIF
	575	bys = NINT( building_wall_south / dy )
	576	byn = bys + bly
	577
	578	!
	579	!-- Building size has to meet some requirements
	580	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	581	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	582	WRITE( message_string, * ) 'inconsistent building parameters:', &
	583	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	584	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	585	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	586	ENDIF
	587
	588	!
[217]	589	!-- Define the building.
[1]	590	nzb_local = 0
[134]	591	nzb_local(bys:byn,bxl:bxr) = bh
[1]	592
[240]	593	CASE ( 'single_street_canyon' )
	594	!
	595	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	596	!-- The canyon is centered in the other direction by default.
[1322]	597	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	598	!
	599	!-- Street canyon in y direction
	600	cwx = NINT( canyon_width_x / dx )
[1322]	601	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	602	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	603	ENDIF
	604	cxl = NINT( canyon_wall_left / dx )
	605	cxr = cxl + cwx
	606
[1322]	607	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	608	!
	609	!-- Street canyon in x direction
	610	cwy = NINT( canyon_width_y / dy )
[1322]	611	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	612	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	613	ENDIF
	614	cys = NINT( canyon_wall_south / dy )
	615	cyn = cys + cwy
	616
	617	ELSE
[254]	618
	619	message_string = 'no street canyon width given'
	620	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	621
[240]	622	ENDIF
	623
[1675]	624	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	625	IF ( ABS( zw(ch ) - canyon_height ) == &
	626	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	627
[240]	628	dp_level_ind_b = ch
	629	!
	630	!-- Street canyon size has to meet some requirements
[1322]	631	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	632	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	633	( ch < 3 ) ) THEN
[1353]	634	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	635	'&cxl=', cxl, 'cxr=', cxr, &
	636	'cwx=', cwx, &
[254]	637	'ch=', ch, 'nx=', nx, 'ny=', ny
	638	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	639	ENDIF
[1322]	640	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	641	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	642	( ch < 3 ) ) THEN
[1353]	643	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	644	'&cys=', cys, 'cyn=', cyn, &
	645	'cwy=', cwy, &
[254]	646	'ch=', ch, 'nx=', nx, 'ny=', ny
	647	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	648	ENDIF
	649	ENDIF
[1353]	650	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	651	canyon_width_y /= 9999999.9_wp ) THEN
	652	message_string = 'inconsistent canyon parameters:' // &
	653	'&street canyon can only be oriented' // &
[254]	654	'&either in x- or in y-direction'
	655	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	656	ENDIF
	657
	658	nzb_local = ch
[1322]	659	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	660	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	661	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	662	nzb_local(cys+1:cyn-1,:) = 0
	663	ENDIF
	664
[1]	665	CASE ( 'read_from_file' )
[759]	666
[818]	667	ALLOCATE ( topo_height(0:ny,0:nx) )
	668
[759]	669	DO ii = 0, io_blocks-1
	670	IF ( ii == io_group ) THEN
	671
[1]	672	!
[759]	673	!-- Arbitrary irregular topography data in PALM format (exactly
	674	!-- matching the grid size and total domain size)
[1069]	675	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	676	FORM='FORMATTED', ERR=10 )
	677	DO j = ny, 0, -1
	678	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	679	ENDDO
	680
	681	GOTO 12
	682
[1069]	683	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	684	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	685
[1069]	686	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	687	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	688
	689	12 CLOSE( 90 )
	690
	691	ENDIF
[809]	692	#if defined( __parallel ) && ! defined ( __check )
[759]	693	CALL MPI_BARRIER( comm2d, ierr )
	694	#endif
[559]	695	ENDDO
[759]	696
[1]	697	!
	698	!-- Calculate the index height of the topography
	699	DO i = 0, nx
	700	DO j = 0, ny
[1675]	701	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	702	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	703	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	704	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	705	ENDDO
	706	ENDDO
[818]	707
	708	DEALLOCATE ( topo_height )
[114]	709	!
[759]	710	!-- Add cyclic boundaries (additional layers are for calculating
	711	!-- flag arrays needed for the multigrid sover)
[114]	712	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	713	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	714	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	715	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	716
[1]	717	CASE DEFAULT
	718	!
	719	!-- The DEFAULT case is reached either if the parameter topography
[217]	720	!-- contains a wrong character string or if the user has defined a special
[1]	721	!-- case in the user interface. There, the subroutine user_init_grid
	722	!-- checks which of these two conditions applies.
[114]	723	CALL user_init_grid( gls, nzb_local )
[1]	724
	725	END SELECT
	726	!
[861]	727	!-- Determine the maximum level of topography. Furthermore it is used for
	728	!-- steering the degradation of order of the applied advection scheme.
[978]	729	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	730	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	731	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	732	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[978]	733	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	734	nzb_max = nzt
	735	ENDIF
	736
[861]	737	!
[1]	738	!-- Consistency checks and index array initialization are only required for
[217]	739	!-- non-flat topography, also the initialization of topography height arrays
[49]	740	!-- zu_s_inner and zw_w_inner
[1]	741	IF ( TRIM( topography ) /= 'flat' ) THEN
	742
	743	!
	744	!-- Consistency checks
	745	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	746	WRITE( message_string, * ) 'nzb_local values are outside the', &
	747	'model domain', &
	748	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	749	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	750	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	751	ENDIF
	752
[722]	753	IF ( bc_lr == 'cyclic' ) THEN
[1353]	754	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	755	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	756	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	757	' boundary condition in x-direction'
	758	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	759	ENDIF
	760	ENDIF
[722]	761	IF ( bc_ns == 'cyclic' ) THEN
[1353]	762	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	763	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	764	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	765	' boundary condition in y-direction'
	766	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	767	ENDIF
	768	ENDIF
	769
[217]	770	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	771	!
[217]	772	!-- The array nzb_local as defined using the 'cell_edge' convention
	773	!-- describes the actual total size of topography which is defined at the
	774	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	775	!-- on the topography walls in y-direction. However, PALM uses individual
	776	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	777	!-- Therefore, the extent of topography in nzb_local is now reduced by
	778	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	779	!-- to form the basis for nzb_s_inner.
	780	DO j = -gls, ny + gls
	781	DO i = -gls, nx
	782	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	783	ENDDO
[134]	784	ENDDO
[217]	785	!-- apply cyclic boundary conditions in x-direction
	786	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	787	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	788	DO i = -gls, nx + gls
	789	DO j = -gls, ny
	790	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	791	ENDDO
[134]	792	ENDDO
[217]	793	!-- apply cyclic boundary conditions in y-direction
	794	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	795	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	796	ENDIF
[134]	797
[1]	798	!
	799	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	800	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	801	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	802
	803	!
	804	!-- Initialize remaining index arrays:
	805	!-- first pre-initialize them with nzb_s_inner...
	806	nzb_u_inner = nzb_s_inner
	807	nzb_u_outer = nzb_s_inner
	808	nzb_v_inner = nzb_s_inner
	809	nzb_v_outer = nzb_s_inner
	810	nzb_w_outer = nzb_s_inner
	811	nzb_s_outer = nzb_s_inner
	812
	813	!
	814	!-- ...then extend pre-initialized arrays in their according directions
	815	!-- based on nzb_local using nzb_tmp as a temporary global index array
	816
	817	!
	818	!-- nzb_s_outer:
	819	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	820	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	821	DO j = -1, ny + 1
	822	DO i = 0, nx
[1353]	823	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	824	nzb_local(j,i+1) )
	825	ENDDO
	826	ENDDO
	827	DO i = nxl, nxr
	828	DO j = nys, nyn
[1353]	829	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	830	nzb_tmp(j+1,i) )
	831	ENDDO
	832	!
	833	!-- non-cyclic boundary conditions (overwritten by call of
	834	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	835	IF ( nys == 0 ) THEN
	836	j = -1
	837	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	838	ENDIF
[1743]	839	IF ( nyn == ny ) THEN
[1]	840	j = ny + 1
	841	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	842	ENDIF
	843	ENDDO
	844	!
	845	!-- nzb_w_outer:
	846	!-- identical to nzb_s_outer
	847	nzb_w_outer = nzb_s_outer
	848
	849	!
	850	!-- nzb_u_inner:
	851	!-- extend nzb_local rightwards only
[667]	852	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	853	DO j = -1, ny + 1
	854	DO i = 0, nx + 1
	855	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	856	ENDDO
	857	ENDDO
[667]	858	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	859
	860	!
	861	!-- nzb_u_outer:
	862	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	863	DO i = nxl, nxr
	864	DO j = nys, nyn
[1353]	865	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	866	nzb_tmp(j+1,i) )
	867	ENDDO
	868	!
	869	!-- non-cyclic boundary conditions (overwritten by call of
	870	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	871	IF ( nys == 0 ) THEN
	872	j = -1
	873	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	874	ENDIF
[1743]	875	IF ( nyn == ny ) THEN
[1]	876	j = ny + 1
	877	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	878	ENDIF
	879	ENDDO
	880
	881	!
	882	!-- nzb_v_inner:
	883	!-- extend nzb_local northwards only
[667]	884	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	885	DO i = -1, nx + 1
	886	DO j = 0, ny + 1
	887	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	888	ENDDO
	889	ENDDO
[667]	890	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	891
	892	!
	893	!-- nzb_v_outer:
	894	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	895	DO j = nys, nyn
	896	DO i = nxl, nxr
[1353]	897	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	898	nzb_tmp(j,i+1) )
	899	ENDDO
	900	!
	901	!-- non-cyclic boundary conditions (overwritten by call of
	902	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	903	IF ( nxl == 0 ) THEN
	904	i = -1
	905	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	906	ENDIF
	907	IF ( nxr == nx ) THEN
	908	i = nx + 1
	909	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	910	ENDIF
	911	ENDDO
[809]	912	#if ! defined ( __check )
[1]	913	!
	914	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	915	!-- boundary conditions, if applicable.
	916	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	917	!-- they do not require exchange and are not included here.
	918	CALL exchange_horiz_2d_int( nzb_u_inner )
	919	CALL exchange_horiz_2d_int( nzb_u_outer )
	920	CALL exchange_horiz_2d_int( nzb_v_inner )
	921	CALL exchange_horiz_2d_int( nzb_v_outer )
	922	CALL exchange_horiz_2d_int( nzb_w_outer )
	923	CALL exchange_horiz_2d_int( nzb_s_outer )
	924
[49]	925	!
	926	!-- Allocate and set the arrays containing the topography height
	927	IF ( myid == 0 ) THEN
	928
	929	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	930
	931	DO i = 0, nx + 1
	932	DO j = 0, ny + 1
	933	zu_s_inner(i,j) = zu(nzb_local(j,i))
	934	zw_w_inner(i,j) = zw(nzb_local(j,i))
	935	ENDDO
	936	ENDDO
	937
	938	ENDIF
[1221]	939	!
	940	!-- Set flag arrays to be used for masking of grid points
	941	DO i = nxlg, nxrg
	942	DO j = nysg, nyng
	943	DO k = nzb, nzt+1
[1353]	944	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	945	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	946	ENDDO
	947	ENDDO
	948	ENDDO
[807]	949	#endif
[1]	950	ENDIF
	951
[809]	952	#if ! defined ( __check )
[1]	953	!
	954	!-- Preliminary: to be removed after completion of the topography code!
	955	!-- Set the former default k index arrays nzb_2d
	956	nzb_2d = nzb
	957
	958	!
	959	!-- Set the individual index arrays which define the k index from which on
	960	!-- the usual finite difference form (which does not use surface fluxes) is
	961	!-- applied
[1691]	962	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	963	nzb_diff_u = nzb_u_inner + 2
	964	nzb_diff_v = nzb_v_inner + 2
	965	nzb_diff_s_inner = nzb_s_inner + 2
	966	nzb_diff_s_outer = nzb_s_outer + 2
	967	ELSE
	968	nzb_diff_u = nzb_u_inner + 1
	969	nzb_diff_v = nzb_v_inner + 1
	970	nzb_diff_s_inner = nzb_s_inner + 1
	971	nzb_diff_s_outer = nzb_s_outer + 1
	972	ENDIF
	973
	974	!
	975	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	976	!-- for limitation of near-wall mixing length l_wall further below
	977	corner_nl = 0
	978	corner_nr = 0
	979	corner_sl = 0
	980	corner_sr = 0
	981	wall_l = 0
	982	wall_n = 0
	983	wall_r = 0
	984	wall_s = 0
	985
	986	DO i = nxl, nxr
	987	DO j = nys, nyn
	988	!
	989	!-- u-component
	990	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	991	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	992	fym(j,i) = 0.0_wp
	993	fyp(j,i) = 1.0_wp
[1]	994	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	995	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	996	fym(j,i) = 1.0_wp
	997	fyp(j,i) = 0.0_wp
[1]	998	ENDIF
	999	!
	1000	!-- v-component
	1001	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1002	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1003	fxm(j,i) = 0.0_wp
	1004	fxp(j,i) = 1.0_wp
[1]	1005	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1006	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1007	fxm(j,i) = 1.0_wp
	1008	fxp(j,i) = 0.0_wp
[1]	1009	ENDIF
	1010	!
	1011	!-- w-component, also used for scalars, separate arrays for shear
	1012	!-- production of tke
	1013	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1014	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1015	wall_w_y(j,i) = 1.0_wp
	1016	fwym(j,i) = 0.0_wp
	1017	fwyp(j,i) = 1.0_wp
[1]	1018	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1019	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1020	wall_w_y(j,i) = 1.0_wp
	1021	fwym(j,i) = 1.0_wp
	1022	fwyp(j,i) = 0.0_wp
[1]	1023	ENDIF
	1024	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1025	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1026	wall_w_x(j,i) = 1.0_wp
	1027	fwxm(j,i) = 0.0_wp
	1028	fwxp(j,i) = 1.0_wp
[1]	1029	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1030	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1031	wall_w_x(j,i) = 1.0_wp
	1032	fwxm(j,i) = 1.0_wp
	1033	fwxp(j,i) = 0.0_wp
[1]	1034	ENDIF
	1035	!
	1036	!-- Wall and corner locations inside buildings for limitation of
	1037	!-- near-wall mixing length l_wall
	1038	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1039
	1040	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1041
	1042	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1043	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1044	nzb_s_inner(j,i-1) ) + 1
	1045	ENDIF
	1046
	1047	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1048	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1049	nzb_s_inner(j,i+1) ) + 1
	1050	ENDIF
	1051
	1052	ENDIF
	1053
	1054	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1055
	1056	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1057	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1058	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1059	nzb_s_inner(j,i-1) ) + 1
	1060	ENDIF
	1061
	1062	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1063	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1064	nzb_s_inner(j,i+1) ) + 1
	1065	ENDIF
	1066
	1067	ENDIF
	1068
	1069	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1070	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1071	ENDIF
	1072
	1073	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1074	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1075	ENDIF
	1076
	1077	ENDDO
	1078	ENDDO
	1079
	1080	!
[114]	1081	!-- Calculate wall flag arrays for the multigrid method
[1575]	1082	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1083	!
	1084	!-- Gridpoint increment of the current level
	1085	inc = 1
	1086
	1087	DO l = maximum_grid_level, 1 , -1
	1088
	1089	nxl_l = nxl_mg(l)
	1090	nxr_l = nxr_mg(l)
	1091	nys_l = nys_mg(l)
	1092	nyn_l = nyn_mg(l)
	1093	nzt_l = nzt_mg(l)
	1094
	1095	!
	1096	!-- Assign the flag level to be calculated
	1097	SELECT CASE ( l )
	1098	CASE ( 1 )
	1099	flags => wall_flags_1
	1100	CASE ( 2 )
	1101	flags => wall_flags_2
	1102	CASE ( 3 )
	1103	flags => wall_flags_3
	1104	CASE ( 4 )
	1105	flags => wall_flags_4
	1106	CASE ( 5 )
	1107	flags => wall_flags_5
	1108	CASE ( 6 )
	1109	flags => wall_flags_6
	1110	CASE ( 7 )
	1111	flags => wall_flags_7
	1112	CASE ( 8 )
	1113	flags => wall_flags_8
	1114	CASE ( 9 )
	1115	flags => wall_flags_9
	1116	CASE ( 10 )
	1117	flags => wall_flags_10
	1118	END SELECT
	1119
	1120	!
	1121	!-- Depending on the grid level, set the respective bits in case of
	1122	!-- neighbouring walls
	1123	!-- Bit 0: wall to the bottom
	1124	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1125	!-- Bit 2: wall to the south
	1126	!-- Bit 3: wall to the north
	1127	!-- Bit 4: wall to the left
	1128	!-- Bit 5: wall to the right
[116]	1129	!-- Bit 6: inside building
[114]	1130
	1131	flags = 0
	1132
[927]	1133	!
	1134	!-- In case of masking method, flags are not set and multigrid method
	1135	!-- works like FFT-solver
	1136	IF ( .NOT. masking_method ) THEN
	1137
	1138	DO i = nxl_l-1, nxr_l+1
	1139	DO j = nys_l-1, nyn_l+1
	1140	DO k = nzb, nzt_l+1
[114]	1141
	1142	!
[927]	1143	!-- Inside/outside building (inside building does not need
	1144	!-- further tests for walls)
	1145	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1146
[927]	1147	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1148
[927]	1149	ELSE
[114]	1150	!
[927]	1151	!-- Bottom wall
	1152	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1153	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1154	ENDIF
[114]	1155	!
[927]	1156	!-- South wall
	1157	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1158	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1159	ENDIF
[114]	1160	!
[927]	1161	!-- North wall
	1162	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1163	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1164	ENDIF
[114]	1165	!
[927]	1166	!-- Left wall
	1167	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1168	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1169	ENDIF
[114]	1170	!
[927]	1171	!-- Right wall
	1172	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1173	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1174	ENDIF
	1175
[114]	1176	ENDIF
	1177
[927]	1178	ENDDO
[114]	1179	ENDDO
	1180	ENDDO
	1181
[927]	1182	ENDIF
	1183
[114]	1184	!
	1185	!-- Test output of flag arrays
[145]	1186	! i = nxl_l
	1187	! WRITE (9,*) ' '
	1188	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1189	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1190	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1191	! DO k = nzt_l+1, nzb, -1
	1192	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1193	! ENDDO
[114]	1194
	1195	inc = inc * 2
	1196
	1197	ENDDO
	1198
	1199	ENDIF
[861]	1200	!
	1201	!-- Allocate flags needed for masking walls.
[1677]	1202	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1203	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1204	wall_flags_0 = 0
	1205	wall_flags_00 = 0
[114]	1206
[1557]	1207	IF ( scalar_advec == 'ws-scheme' .OR. &
	1208	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1209	!
[861]	1210	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1211	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1212	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1213	!-- grid points.
	1214	DO i = nxl, nxr
	1215	DO j = nys, nyn
	1216	DO k = nzb_s_inner(j,i)+1, nzt
	1217	!
	1218	!-- scalar - x-direction
	1219	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1220	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1221	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1222	.AND. i == nxr ) ) THEN
[861]	1223	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1224	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1225	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1226	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1227	) THEN
[861]	1228	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1229	ELSE
	1230	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1231	ENDIF
	1232	!
	1233	!-- scalar - y-direction
	1234	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1235	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1236	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1237	.AND. j == nyn ) ) THEN
[861]	1238	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1239	!-- WS3
	1240	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1241	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1242	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1243	) THEN
[861]	1244	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1245	!-- WS5
	1246	ELSE
	1247	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1248	ENDIF
	1249	!
	1250	!-- scalar - z-direction
	1251	!-- WS1 (6), WS3 (7), WS5 (8)
	1252	flag_set = .FALSE.
	1253	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1254	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1255	flag_set = .TRUE.
	1256	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1257	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1258	flag_set = .TRUE.
	1259	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1260	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1261	ENDIF
	1262	ENDDO
	1263	ENDDO
	1264	ENDDO
	1265	ENDIF
	1266
	1267	IF ( momentum_advec == 'ws-scheme' ) THEN
	1268	!
	1269	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1270	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1271	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1272	!-- grid points.
	1273	DO i = nxl, nxr
	1274	DO j = nys, nyn
[1580]	1275	DO k = nzb+1, nzt
[861]	1276	!
[1580]	1277	!-- At first, set flags to WS1.
	1278	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1279	!-- in order to handle the left/south flux.
	1280	!-- near vertical walls.
	1281	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1282	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1283	!
[861]	1284	!-- u component - x-direction
	1285	!-- WS1 (9), WS3 (10), WS5 (11)
	1286	IF ( k <= nzb_u_inner(j,i+1) &
[1409]	1287	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
[978]	1288	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1289	) THEN
[1580]	1290	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[861]	1291	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1292	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1293	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1294	) THEN
[861]	1295	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1296	!
	1297	!-- Clear flag for WS1
	1298	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1299	ELSE
	1300	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1301	!
	1302	!-- Clear flag for WS1
	1303	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1304	ENDIF
	1305	!
	1306	!-- u component - y-direction
	1307	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1308	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1309	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1310	.AND. j == nyn ) ) THEN
[1580]	1311	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1312	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1313	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1314	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1315	) THEN
[861]	1316	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1317	!
	1318	!-- Clear flag for WS1
	1319	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1320	ELSE
	1321	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1322	!
	1323	!-- Clear flag for WS1
	1324	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1325	ENDIF
	1326	!
	1327	!-- u component - z-direction
	1328	!-- WS1 (15), WS3 (16), WS5 (17)
	1329	flag_set = .FALSE.
	1330	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1331	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1332	flag_set = .TRUE.
	1333	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1334	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1335	flag_set = .TRUE.
	1336	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1337	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1338	ENDIF
	1339
	1340	ENDDO
	1341	ENDDO
	1342	ENDDO
	1343
	1344	DO i = nxl, nxr
	1345	DO j = nys, nyn
[1580]	1346	DO k = nzb+1, nzt
[861]	1347	!
[1580]	1348	!-- At first, set flags to WS1.
	1349	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1350	!-- in order to handle the left/south flux.
	1351	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1352	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1353	!
[861]	1354	!-- v component - x-direction
	1355	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1356	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1357	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1358	.AND. i == nxr ) ) THEN
[1580]	1359	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
[861]	1360	!-- WS3
	1361	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1362	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1363	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1364	) THEN
[861]	1365	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1366	!
	1367	!-- Clear flag for WS1
	1368	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1369	ELSE
	1370	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1371	!
	1372	!-- Clear flag for WS1
	1373	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1374	ENDIF
	1375	!
	1376	!-- v component - y-direction
	1377	!-- WS1 (21), WS3 (22), WS5 (23)
	1378	IF ( k <= nzb_v_inner(j+1,i) &
[1409]	1379	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
[978]	1380	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1381	) THEN
[1580]	1382	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1383	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1384	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1385	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1386	) THEN
[861]	1387	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1388	!
	1389	!-- Clear flag for WS1
	1390	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1391	ELSE
	1392	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1393	!
	1394	!-- Clear flag for WS1
	1395	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1396	ENDIF
	1397	!
	1398	!-- v component - z-direction
	1399	!-- WS1 (24), WS3 (25), WS5 (26)
	1400	flag_set = .FALSE.
	1401	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1402	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1403	flag_set = .TRUE.
	1404	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1405	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1406	flag_set = .TRUE.
	1407	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1408	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1409	ENDIF
	1410
	1411	ENDDO
	1412	ENDDO
	1413	ENDDO
	1414	DO i = nxl, nxr
	1415	DO j = nys, nyn
[1580]	1416	DO k = nzb+1, nzt
[861]	1417	!
[1580]	1418	!-- At first, set flags to WS1.
	1419	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1420	!-- in order to handle the left/south flux.
	1421	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1422	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1423	!
[861]	1424	!-- w component - x-direction
	1425	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1426	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1427	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1428	.AND. i == nxr ) ) THEN
[1580]	1429	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1430	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1431	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1432	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1433	) THEN
[861]	1434	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1435	!
	1436	!-- Clear flag for WS1
	1437	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1438	ELSE
	1439	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1440	!
	1441	!-- Clear flag for WS1
	1442	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1443	ENDIF
	1444	!
	1445	!-- w component - y-direction
	1446	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1447	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1448	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1449	.AND. j == nyn ) ) THEN
[1580]	1450	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1451	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1452	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1453	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1454	) THEN
[861]	1455	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1456	!
	1457	!-- Clear flag for WS1
	1458	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1459	ELSE
[1221]	1460	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1461	!
	1462	!-- Clear flag for WS1
	1463	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1464	ENDIF
	1465	!
	1466	!-- w component - z-direction
[1679]	1467	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1468	flag_set = .FALSE.
	1469	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1470	.OR. k == nzt ) THEN
	1471	!
	1472	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1473	!-- set, although this is not a prognostic level. However,
	1474	!-- contrary to the advection of u,v and s this is necessary
	1475	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1476	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1477	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1478	flag_set = .TRUE.
	1479	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1480	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1481	flag_set = .TRUE.
	1482	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1483	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1484	ENDIF
	1485
	1486	ENDDO
	1487	ENDDO
	1488	ENDDO
	1489
	1490	ENDIF
	1491
	1492	!
[1677]	1493	!-- Exchange 3D integer wall_flags.
	1494	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1495	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1496	!
	1497	!-- Exchange ghost points for advection flags
	1498	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1499	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1500	!
	1501	!-- Set boundary flags at inflow and outflow boundary in case of
	1502	!-- non-cyclic boundary conditions.
	1503	IF ( inflow_l .OR. outflow_l ) THEN
	1504	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1505	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1506	ENDIF
	1507
	1508	IF ( inflow_r .OR. outflow_r ) THEN
	1509	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1510	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1511	ENDIF
	1512
	1513	IF ( inflow_n .OR. outflow_n ) THEN
	1514	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1515	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1516	ENDIF
	1517
	1518	IF ( inflow_s .OR. outflow_s ) THEN
	1519	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1520	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1521	ENDIF
	1522
	1523	ENDIF
	1524
	1525	!
[1]	1526	!-- In case of topography: limit near-wall mixing length l_wall further:
	1527	!-- Go through all points of the subdomain one by one and look for the closest
	1528	!-- surface
	1529	IF ( TRIM(topography) /= 'flat' ) THEN
	1530	DO i = nxl, nxr
	1531	DO j = nys, nyn
	1532
	1533	nzb_si = nzb_s_inner(j,i)
	1534	vi = vertical_influence(nzb_si)
	1535
	1536	IF ( wall_n(j,i) > 0 ) THEN
	1537	!
	1538	!-- North wall (y distance)
	1539	DO k = wall_n(j,i), nzb_si
[1353]	1540	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1541	ENDDO
	1542	!
	1543	!-- Above North wall (yz distance)
	1544	DO k = nzb_si + 1, nzb_si + vi
[1353]	1545	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1546	SQRT( 0.25_wp * dy**2 + &
[1]	1547	( zu(k) - zw(nzb_si) )**2 ) )
	1548	ENDDO
	1549	!
	1550	!-- Northleft corner (xy distance)
	1551	IF ( corner_nl(j,i) > 0 ) THEN
	1552	DO k = corner_nl(j,i), nzb_si
	1553	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1554	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1555	ENDDO
	1556	!
	1557	!-- Above Northleft corner (xyz distance)
	1558	DO k = nzb_si + 1, nzb_si + vi
[1353]	1559	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1560	SQRT( 0.25_wp * (dx2 + dy2) + &
	1561	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1562	ENDDO
	1563	ENDIF
	1564	!
	1565	!-- Northright corner (xy distance)
	1566	IF ( corner_nr(j,i) > 0 ) THEN
	1567	DO k = corner_nr(j,i), nzb_si
[1353]	1568	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1569	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1570	ENDDO
	1571	!
	1572	!-- Above northright corner (xyz distance)
	1573	DO k = nzb_si + 1, nzb_si + vi
[1353]	1574	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1575	SQRT( 0.25_wp * (dx2 + dy2) + &
	1576	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1577	ENDDO
	1578	ENDIF
	1579	ENDIF
	1580
	1581	IF ( wall_s(j,i) > 0 ) THEN
	1582	!
	1583	!-- South wall (y distance)
	1584	DO k = wall_s(j,i), nzb_si
[1353]	1585	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1586	ENDDO
	1587	!
	1588	!-- Above south wall (yz distance)
[1353]	1589	DO k = nzb_si + 1, nzb_si + vi
	1590	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1591	SQRT( 0.25_wp * dy**2 + &
[1]	1592	( zu(k) - zw(nzb_si) )**2 ) )
	1593	ENDDO
	1594	!
	1595	!-- Southleft corner (xy distance)
	1596	IF ( corner_sl(j,i) > 0 ) THEN
	1597	DO k = corner_sl(j,i), nzb_si
[1353]	1598	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1599	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1600	ENDDO
	1601	!
	1602	!-- Above southleft corner (xyz distance)
	1603	DO k = nzb_si + 1, nzb_si + vi
[1353]	1604	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1605	SQRT( 0.25_wp * (dx2 + dy2) + &
	1606	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1607	ENDDO
	1608	ENDIF
	1609	!
	1610	!-- Southright corner (xy distance)
	1611	IF ( corner_sr(j,i) > 0 ) THEN
	1612	DO k = corner_sr(j,i), nzb_si
[1353]	1613	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1614	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1615	ENDDO
	1616	!
	1617	!-- Above southright corner (xyz distance)
	1618	DO k = nzb_si + 1, nzb_si + vi
[1353]	1619	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1620	SQRT( 0.25_wp * (dx2 + dy2) + &
	1621	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1622	ENDDO
	1623	ENDIF
	1624
	1625	ENDIF
	1626
	1627	IF ( wall_l(j,i) > 0 ) THEN
	1628	!
	1629	!-- Left wall (x distance)
	1630	DO k = wall_l(j,i), nzb_si
[1353]	1631	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1632	ENDDO
	1633	!
	1634	!-- Above left wall (xz distance)
	1635	DO k = nzb_si + 1, nzb_si + vi
[1353]	1636	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1637	SQRT( 0.25_wp * dx**2 + &
	1638	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1639	ENDDO
	1640	ENDIF
	1641
	1642	IF ( wall_r(j,i) > 0 ) THEN
	1643	!
	1644	!-- Right wall (x distance)
	1645	DO k = wall_r(j,i), nzb_si
[1353]	1646	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1647	ENDDO
	1648	!
	1649	!-- Above right wall (xz distance)
	1650	DO k = nzb_si + 1, nzb_si + vi
[1353]	1651	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1652	SQRT( 0.25_wp * dx**2 + &
[1]	1653	( zu(k) - zw(nzb_si) )**2 ) )
	1654	ENDDO
	1655
	1656	ENDIF
	1657
	1658	ENDDO
	1659	ENDDO
	1660
	1661	ENDIF
	1662
	1663	!
	1664	!-- Multiplication with wall_adjustment_factor
	1665	l_wall = wall_adjustment_factor * l_wall
	1666
	1667	!
[709]	1668	!-- Set lateral boundary conditions for l_wall
[667]	1669	CALL exchange_horiz( l_wall, nbgp )
	1670
[1]	1671	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1672	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1673
[807]	1674	#endif
[1]	1675
	1676	END SUBROUTINE init_grid

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