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source: palm/trunk/SOURCE/init_grid.f90 @ 1787

Last change on this file since 1787 was 1780, checked in by raasch, 9 years ago
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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	! -----------------
[1744]	21	!
[1780]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: init_grid.f90 1780 2016-03-03 08:39:40Z raasch $
	26	!
[1780]	27	! 1779 2016-03-03 08:01:28Z raasch
	28	! coupling_char is trimmed at every place it occurs, because it can have
	29	! different length now
	30	!
[1763]	31	! 1762 2016-02-25 12:31:13Z hellstea
	32	! Introduction of nested domain feature
	33	!
[1744]	34	! 1743 2016-01-13 10:23:51Z raasch
	35	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	36	! total domain
	37	!
[1692]	38	! 1691 2015-10-26 16:17:44Z maronga
	39	! Renamed prandtl_layer to constant_flux_layer.
	40	!
[1683]	41	! 1682 2015-10-07 23:56:08Z knoop
	42	! Code annotations made doxygen readable
	43	!
[1678]	44	! 1677 2015-10-02 13:25:23Z boeske
	45	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	46	!
[1676]	47	! 1675 2015-10-02 08:28:59Z gronemeier
	48	! Bugfix: Definition of topography grid levels
	49	!
[1662]	50	! 1660 2015-09-21 08:15:16Z gronemeier
	51	! Bugfix: Definition of topography grid levels if vertical grid stretching
	52	! starts below the maximum topography height.
	53	!
[1581]	54	! 1580 2015-04-10 13:43:49Z suehring
	55	! Bugfix: setting flags for 5th order scheme near buildings
	56	!
[1576]	57	! 1575 2015-03-27 09:56:27Z raasch
	58	! adjustments for psolver-queries
	59	!
[1558]	60	! 1557 2015-03-05 16:43:04Z suehring
	61	! Adjustment for monotoinic limiter
	62	!
[1419]	63	! 1418 2014-06-06 13:05:08Z fricke
	64	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	65	! condition and a negative value for dz_stretch_level the condition
	66	! was always true for the whole model domain
	67	!
[1410]	68	! 1409 2014-05-23 12:11:32Z suehring
	69	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	70	! j <= nysv
	71	!
[1354]	72	! 1353 2014-04-08 15:21:23Z heinze
	73	! REAL constants provided with KIND-attribute
	74	!
[1323]	75	! 1322 2014-03-20 16:38:49Z raasch
	76	! REAL constants defined as wp-kind
	77	!
[1321]	78	! 1320 2014-03-20 08:40:49Z raasch
[1320]	79	! ONLY-attribute added to USE-statements,
	80	! kind-parameters added to all INTEGER and REAL declaration statements,
	81	! kinds are defined in new module kinds,
	82	! revision history before 2012 removed,
	83	! comment fields (!:) to be used for variable explanations added to
	84	! all variable declaration statements
[1321]	85	!
[1222]	86	! 1221 2013-09-10 08:59:13Z raasch
	87	! wall_flags_00 introduced to hold bits 32-63,
	88	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	89	! loops optimized for openACC (pres + flow_statistics)
	90	!
[1093]	91	! 1092 2013-02-02 11:24:22Z raasch
	92	! unused variables removed
	93	!
[1070]	94	! 1069 2012-11-28 16:18:43Z maronga
[1779]	95	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	96	! ocean model in case of coupled runs
[1070]	97	!
[1037]	98	! 1036 2012-10-22 13:43:42Z raasch
	99	! code put under GPL (PALM 3.9)
	100	!
[1017]	101	! 1015 2012-09-27 09:23:24Z raasch
	102	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	103	! nzb_w_inner+1
	104	!
[997]	105	! 996 2012-09-07 10:41:47Z raasch
	106	! little reformatting
	107	!
[979]	108	! 978 2012-08-09 08:28:32Z fricke
	109	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	110	! Bugfix: Set wall_flags_0 for inflow boundary
	111	!
[928]	112	! 927 2012-06-06 19:15:04Z raasch
	113	! Wall flags are not set for multigrid method in case of masking method
	114	!
[865]	115	! 864 2012-03-27 15:10:33Z gryschka
[927]	116	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	117	! were not correctly defined for k=1.
[865]	118	!
[863]	119	! 861 2012-03-26 14:18:34Z suehring
[861]	120	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	121	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	122	! model domain.!
[861]	123	! Initialization of nzb_s_inner and nzb_w_inner.
	124	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	125	! while setting wall_flags_0
	126	!
[844]	127	! 843 2012-02-29 15:16:21Z gryschka
	128	! In case of ocean and dirichlet bc for u and v at the bottom
	129	! the first u-level ist defined at same height as the first w-level
	130	!
[819]	131	! 818 2012-02-08 16:11:23Z maronga
	132	! Bugfix: topo_height is only required if topography is used. It is thus now
	133	! allocated in the topography branch
	134	!
[810]	135	! 809 2012-01-30 13:32:58Z maronga
	136	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	137	!
[808]	138	! 807 2012-01-25 11:53:51Z maronga
	139	! New cpp directive "__check" implemented which is used by check_namelist_files
	140	!
[1]	141	! Revision 1.1 1997/08/11 06:17:45 raasch
	142	! Initial revision (Testversion)
	143	!
	144	!
	145	! Description:
	146	! ------------
[1682]	147	!> Creating grid depending constants
[1]	148	!------------------------------------------------------------------------------!
[1682]	149	SUBROUTINE init_grid
	150
[1]	151
[1320]	152	USE arrays_3d, &
	153	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	154	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	155
[1353]	156	USE control_parameters, &
[1320]	157	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	158	building_length_y, building_wall_left, building_wall_south, &
	159	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	160	canyon_width_x, canyon_width_y, constant_flux_layer, &
	161	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	162	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	163	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	164	masking_method, maximum_grid_level, message_string, &
[1762]	165	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	166	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
	167	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	168	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	169	wall_adjustment_factor
[1320]	170
	171	USE grid_variables, &
	172	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	173	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	174	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	175
	176	USE indices, &
	177	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	178	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	179	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	180	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	181	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	182	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	183	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	184	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	185	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	186	wall_flags_9
	187
	188	USE kinds
	189
[1]	190	USE pegrid
	191
	192	IMPLICIT NONE
	193
[1682]	194	INTEGER(iwp) :: bh !<
	195	INTEGER(iwp) :: blx !<
	196	INTEGER(iwp) :: bly !<
	197	INTEGER(iwp) :: bxl !<
	198	INTEGER(iwp) :: bxr !<
	199	INTEGER(iwp) :: byn !<
	200	INTEGER(iwp) :: bys !<
	201	INTEGER(iwp) :: ch !<
	202	INTEGER(iwp) :: cwx !<
	203	INTEGER(iwp) :: cwy !<
	204	INTEGER(iwp) :: cxl !<
	205	INTEGER(iwp) :: cxr !<
	206	INTEGER(iwp) :: cyn !<
	207	INTEGER(iwp) :: cys !<
	208	INTEGER(iwp) :: gls !<
	209	INTEGER(iwp) :: i !<
	210	INTEGER(iwp) :: ii !<
	211	INTEGER(iwp) :: inc !<
	212	INTEGER(iwp) :: j !<
	213	INTEGER(iwp) :: k !<
	214	INTEGER(iwp) :: l !<
	215	INTEGER(iwp) :: nxl_l !<
	216	INTEGER(iwp) :: nxr_l !<
	217	INTEGER(iwp) :: nyn_l !<
	218	INTEGER(iwp) :: nys_l !<
	219	INTEGER(iwp) :: nzb_si !<
	220	INTEGER(iwp) :: nzt_l !<
	221	INTEGER(iwp) :: vi !<
[1]	222
[1682]	223	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
[1]	224
[1682]	225	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
	226	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
	227	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
	228	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
	229	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
	230	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
	231	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
	232	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
	233	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
	234	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
[1]	235
[1682]	236	LOGICAL :: flag_set = .FALSE. !<
[861]	237
[1682]	238	REAL(wp) :: dx_l !<
	239	REAL(wp) :: dy_l !<
	240	REAL(wp) :: dz_stretched !<
[1]	241
[1682]	242	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
[1]	243
[667]	244
[1]	245	!
[709]	246	!-- Calculation of horizontal array bounds including ghost layers
[667]	247	nxlg = nxl - nbgp
	248	nxrg = nxr + nbgp
	249	nysg = nys - nbgp
	250	nyng = nyn + nbgp
[709]	251
[667]	252	!
[1]	253	!-- Allocate grid arrays
[1353]	254	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	255	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	256
	257	!
	258	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	259	IF ( dz == -1.0_wp ) THEN
[254]	260	message_string = 'missing dz'
	261	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	262	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	263	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	264	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	265	ENDIF
[94]	266
[1]	267	!
[94]	268	!-- Define the vertical grid levels
	269	IF ( .NOT. ocean ) THEN
	270	!
	271	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	272	!-- The second u-level (k=1) corresponds to the top of the
[94]	273	!-- Prandtl-layer.
[667]	274
	275	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	276	zu(0) = 0.0_wp
	277	! zu(0) = - dz * 0.5_wp
[667]	278	ELSE
[1353]	279	zu(0) = - dz * 0.5_wp
[667]	280	ENDIF
[1353]	281	zu(1) = dz * 0.5_wp
[1]	282
[94]	283	dz_stretch_level_index = nzt+1
	284	dz_stretched = dz
	285	DO k = 2, nzt+1
	286	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	287	dz_stretched = dz_stretched * dz_stretch_factor
	288	dz_stretched = MIN( dz_stretched, dz_max )
	289	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	290	ENDIF
	291	zu(k) = zu(k-1) + dz_stretched
	292	ENDDO
[1]	293
	294	!
[94]	295	!-- Compute the w-levels. They are always staggered half-way between the
[843]	296	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	297	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	298	!-- The top w-level is extrapolated linearly.
[1353]	299	zw(0) = 0.0_wp
[94]	300	DO k = 1, nzt
[1353]	301	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	302	ENDDO
[1353]	303	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	304
[94]	305	ELSE
[1]	306	!
[843]	307	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	308	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	309	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	310	!-- w-level are defined at same height, but staggered from the second level.
	311	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	312	zu(nzt+1) = dz * 0.5_wp
	313	zu(nzt) = - dz * 0.5_wp
[94]	314
	315	dz_stretch_level_index = 0
	316	dz_stretched = dz
	317	DO k = nzt-1, 0, -1
[1418]	318	!
	319	!-- The default value of dz_stretch_level is positive, thus the first
	320	!-- condition is always true. Hence, the second condition is necessary.
	321	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	322	.AND. dz_stretched < dz_max ) THEN
[94]	323	dz_stretched = dz_stretched * dz_stretch_factor
	324	dz_stretched = MIN( dz_stretched, dz_max )
	325	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	326	ENDIF
	327	zu(k) = zu(k+1) - dz_stretched
	328	ENDDO
	329
	330	!
	331	!-- Compute the w-levels. They are always staggered half-way between the
[843]	332	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	333	!-- at the ground. In this case the first u- and w-level are defined at
	334	!-- same height. The top w-level (nzt+1) is not used but set for
	335	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	336	zw(nzt+1) = dz
[1353]	337	zw(nzt) = 0.0_wp
[94]	338	DO k = 0, nzt
[1353]	339	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	340	ENDDO
	341
[843]	342	!
	343	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	344	!-- at same height.
	345	IF ( ibc_uv_b == 0 ) THEN
	346	zu(0) = zw(0)
	347	ENDIF
	348
[94]	349	ENDIF
	350
	351	!
[1]	352	!-- Compute grid lengths.
	353	DO k = 1, nzt+1
	354	dzu(k) = zu(k) - zu(k-1)
[1353]	355	ddzu(k) = 1.0_wp / dzu(k)
[1]	356	dzw(k) = zw(k) - zw(k-1)
[1353]	357	ddzw(k) = 1.0_wp / dzw(k)
[1]	358	ENDDO
	359
	360	DO k = 1, nzt
[1353]	361	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	362	ENDDO
[667]	363
	364	!
[709]	365	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	366	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	367	!-- is only dz/2, but should be dz. Therefore, an additional array
	368	!-- containing with appropriate grid information is created for these
	369	!-- solvers.
[1575]	370	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	371	ALLOCATE( ddzu_pres(1:nzt+1) )
	372	ddzu_pres = ddzu
[864]	373	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	374	ENDIF
[1]	375
	376	!
	377	!-- In case of multigrid method, compute grid lengths and grid factors for the
	378	!-- grid levels
[1575]	379	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	380
	381	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	382	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	383	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	384	f1_mg(nzb+1:nzt,maximum_grid_level), &
	385	f2_mg(nzb+1:nzt,maximum_grid_level), &
	386	f3_mg(nzb+1:nzt,maximum_grid_level) )
	387
	388	dzu_mg(:,maximum_grid_level) = dzu
[667]	389	!
[864]	390	!-- Next line to ensure an equally spaced grid.
	391	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	392
[1]	393	dzw_mg(:,maximum_grid_level) = dzw
	394	nzt_l = nzt
	395	DO l = maximum_grid_level-1, 1, -1
[1353]	396	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	397	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	398	nzt_l = nzt_l / 2
	399	DO k = 2, nzt_l+1
	400	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	401	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	402	ENDDO
	403	ENDDO
	404
	405	nzt_l = nzt
	406	dx_l = dx
	407	dy_l = dy
	408	DO l = maximum_grid_level, 1, -1
[1353]	409	ddx2_mg(l) = 1.0_wp / dx_l**2
	410	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	411	DO k = nzb+1, nzt_l
[1353]	412	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	413	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	414	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	415	f2_mg(k,l) + f3_mg(k,l)
	416	ENDDO
	417	nzt_l = nzt_l / 2
[1353]	418	dx_l = dx_l * 2.0_wp
	419	dy_l = dy_l * 2.0_wp
[1]	420	ENDDO
	421
	422	ENDIF
	423
	424	!
	425	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	426	ddx = 1.0_wp / dx
	427	ddy = 1.0_wp / dy
[1]	428	dx2 = dx * dx
	429	dy2 = dy * dy
[1353]	430	ddx2 = 1.0_wp / dx2
	431	ddy2 = 1.0_wp / dy2
[1]	432
	433	!
	434	!-- Compute the grid-dependent mixing length.
	435	DO k = 1, nzt
[1322]	436	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	437	ENDDO
	438
	439	!
	440	!-- Allocate outer and inner index arrays for topography and set
[114]	441	!-- defaults.
	442	!-- nzb_local has to contain additional layers of ghost points for calculating
	443	!-- the flag arrays needed for the multigrid method
	444	gls = 2**( maximum_grid_level )
[861]	445	IF ( gls < nbgp ) gls = nbgp
[667]	446
[114]	447	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	448	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	449	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	450	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	451	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	452	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	453	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	454	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	455	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	456	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	457	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	458	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	459	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	460	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	461	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	462	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	463	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	464	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	465	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	466	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	467	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	468	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	469	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	470	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	471	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	472	wall_e_x(nysg:nyng,nxlg:nxrg), &
	473	wall_e_y(nysg:nyng,nxlg:nxrg), &
	474	wall_u(nysg:nyng,nxlg:nxrg), &
	475	wall_v(nysg:nyng,nxlg:nxrg), &
	476	wall_w_x(nysg:nyng,nxlg:nxrg), &
	477	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	478
	479
[667]	480
	481	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	482
[818]	483
[1]	484	nzb_s_inner = nzb; nzb_s_outer = nzb
	485	nzb_u_inner = nzb; nzb_u_outer = nzb
	486	nzb_v_inner = nzb; nzb_v_outer = nzb
	487	nzb_w_inner = nzb; nzb_w_outer = nzb
	488
[1353]	489	rflags_s_inner = 1.0_wp
	490	rflags_invers = 1.0_wp
[1221]	491
[1]	492	!
[19]	493	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	494	!-- form (which does not use surface fluxes) is applied
[1691]	495	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	496	nzb_diff = nzb + 2
	497	ELSE
	498	nzb_diff = nzb + 1
	499	ENDIF
[19]	500	IF ( use_top_fluxes ) THEN
	501	nzt_diff = nzt - 1
	502	ELSE
	503	nzt_diff = nzt
	504	ENDIF
[1]	505
	506	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	507	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	508
[1353]	509	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	510	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	511	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	512	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	513
	514	!
	515	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	516	!-- for the moment,
	517	!-- multiplication with wall_adjustment_factor near the end of this routine
	518	l_wall(nzb,:,:) = l_grid(1)
	519	DO k = nzb+1, nzt
	520	l_wall(k,:,:) = l_grid(k)
	521	ENDDO
	522	l_wall(nzt+1,:,:) = l_grid(nzt)
	523
	524	ALLOCATE ( vertical_influence(nzb:nzt) )
	525	DO k = 1, nzt
	526	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	527	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	528	ENDDO
	529
	530	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	531	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	532	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	533	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	534	'threshold given by only local', &
	535	' &horizontal reduction of near_wall ', &
	536	'mixing length l_wall', &
	537	' &starting from height level k = ', k, '.'
	538	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	539	EXIT
	540	ENDIF
	541	ENDDO
	542	vertical_influence(0) = vertical_influence(1)
	543
[667]	544	DO i = nxlg, nxrg
	545	DO j = nysg, nyng
[1]	546	DO k = nzb_s_inner(j,i) + 1, &
	547	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	548	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	549	ENDDO
	550	ENDDO
	551	ENDDO
	552
	553	!
	554	!-- Set outer and inner index arrays for non-flat topography.
	555	!-- Here consistency checks concerning domain size and periodicity are
	556	!-- necessary.
	557	!-- Within this SELECT CASE structure only nzb_local is initialized
	558	!-- individually depending on the chosen topography type, all other index
	559	!-- arrays are initialized further below.
	560	SELECT CASE ( TRIM( topography ) )
	561
	562	CASE ( 'flat' )
	563	!
[555]	564	!-- nzb_local is required for the multigrid solver
	565	nzb_local = 0
[1]	566
	567	CASE ( 'single_building' )
	568	!
	569	!-- Single rectangular building, by default centered in the middle of the
	570	!-- total domain
	571	blx = NINT( building_length_x / dx )
	572	bly = NINT( building_length_y / dy )
[1675]	573	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	574	IF ( ABS( zw(bh ) - building_height ) == &
	575	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	576
[1322]	577	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	578	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	579	ENDIF
	580	bxl = NINT( building_wall_left / dx )
	581	bxr = bxl + blx
	582
[1322]	583	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	584	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	585	ENDIF
	586	bys = NINT( building_wall_south / dy )
	587	byn = bys + bly
	588
	589	!
	590	!-- Building size has to meet some requirements
	591	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	592	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	593	WRITE( message_string, * ) 'inconsistent building parameters:', &
	594	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	595	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	596	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	597	ENDIF
	598
	599	!
[217]	600	!-- Define the building.
[1]	601	nzb_local = 0
[134]	602	nzb_local(bys:byn,bxl:bxr) = bh
[1]	603
[240]	604	CASE ( 'single_street_canyon' )
	605	!
	606	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	607	!-- The canyon is centered in the other direction by default.
[1322]	608	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	609	!
	610	!-- Street canyon in y direction
	611	cwx = NINT( canyon_width_x / dx )
[1322]	612	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	613	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	614	ENDIF
	615	cxl = NINT( canyon_wall_left / dx )
	616	cxr = cxl + cwx
	617
[1322]	618	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	619	!
	620	!-- Street canyon in x direction
	621	cwy = NINT( canyon_width_y / dy )
[1322]	622	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	623	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	624	ENDIF
	625	cys = NINT( canyon_wall_south / dy )
	626	cyn = cys + cwy
	627
	628	ELSE
[254]	629
	630	message_string = 'no street canyon width given'
	631	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	632
[240]	633	ENDIF
	634
[1675]	635	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	636	IF ( ABS( zw(ch ) - canyon_height ) == &
	637	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	638
[240]	639	dp_level_ind_b = ch
	640	!
	641	!-- Street canyon size has to meet some requirements
[1322]	642	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	643	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	644	( ch < 3 ) ) THEN
[1353]	645	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	646	'&cxl=', cxl, 'cxr=', cxr, &
	647	'cwx=', cwx, &
[254]	648	'ch=', ch, 'nx=', nx, 'ny=', ny
	649	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	650	ENDIF
[1322]	651	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	652	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	653	( ch < 3 ) ) THEN
[1353]	654	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	655	'&cys=', cys, 'cyn=', cyn, &
	656	'cwy=', cwy, &
[254]	657	'ch=', ch, 'nx=', nx, 'ny=', ny
	658	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	659	ENDIF
	660	ENDIF
[1353]	661	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	662	canyon_width_y /= 9999999.9_wp ) THEN
	663	message_string = 'inconsistent canyon parameters:' // &
	664	'&street canyon can only be oriented' // &
[254]	665	'&either in x- or in y-direction'
	666	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	667	ENDIF
	668
	669	nzb_local = ch
[1322]	670	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	671	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	672	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	673	nzb_local(cys+1:cyn-1,:) = 0
	674	ENDIF
	675
[1]	676	CASE ( 'read_from_file' )
[759]	677
[818]	678	ALLOCATE ( topo_height(0:ny,0:nx) )
	679
[759]	680	DO ii = 0, io_blocks-1
	681	IF ( ii == io_group ) THEN
	682
[1]	683	!
[759]	684	!-- Arbitrary irregular topography data in PALM format (exactly
	685	!-- matching the grid size and total domain size)
[1779]	686	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	687	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[759]	688	DO j = ny, 0, -1
	689	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	690	ENDDO
	691
	692	GOTO 12
	693
[1779]	694	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	695	' does not exist'
[759]	696	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	697
[1779]	698	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	699	TRIM( coupling_char )
[759]	700	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	701
	702	12 CLOSE( 90 )
	703
	704	ENDIF
[809]	705	#if defined( __parallel ) && ! defined ( __check )
[759]	706	CALL MPI_BARRIER( comm2d, ierr )
	707	#endif
[559]	708	ENDDO
[759]	709
[1]	710	!
	711	!-- Calculate the index height of the topography
	712	DO i = 0, nx
	713	DO j = 0, ny
[1675]	714	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	715	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	716	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	717	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	718	ENDDO
	719	ENDDO
[818]	720
	721	DEALLOCATE ( topo_height )
[114]	722	!
[759]	723	!-- Add cyclic boundaries (additional layers are for calculating
	724	!-- flag arrays needed for the multigrid sover)
[114]	725	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	726	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	727	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	728	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	729
[1]	730	CASE DEFAULT
	731	!
	732	!-- The DEFAULT case is reached either if the parameter topography
[217]	733	!-- contains a wrong character string or if the user has defined a special
[1]	734	!-- case in the user interface. There, the subroutine user_init_grid
	735	!-- checks which of these two conditions applies.
[114]	736	CALL user_init_grid( gls, nzb_local )
[1]	737
	738	END SELECT
	739	!
[861]	740	!-- Determine the maximum level of topography. Furthermore it is used for
	741	!-- steering the degradation of order of the applied advection scheme.
[978]	742	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	743	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	744	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	745	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	746	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	747	nest_domain ) &
	748	THEN
	749	nzb_max = nzt
[978]	750	ENDIF
	751
[861]	752	!
[1]	753	!-- Consistency checks and index array initialization are only required for
[217]	754	!-- non-flat topography, also the initialization of topography height arrays
[49]	755	!-- zu_s_inner and zw_w_inner
[1]	756	IF ( TRIM( topography ) /= 'flat' ) THEN
	757
	758	!
	759	!-- Consistency checks
	760	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	761	WRITE( message_string, * ) 'nzb_local values are outside the', &
	762	'model domain', &
	763	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	764	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	765	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	766	ENDIF
	767
[722]	768	IF ( bc_lr == 'cyclic' ) THEN
[1353]	769	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	770	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	771	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	772	' boundary condition in x-direction'
	773	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	774	ENDIF
	775	ENDIF
[722]	776	IF ( bc_ns == 'cyclic' ) THEN
[1353]	777	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	778	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	779	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	780	' boundary condition in y-direction'
	781	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	782	ENDIF
	783	ENDIF
	784
[217]	785	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	786	!
[217]	787	!-- The array nzb_local as defined using the 'cell_edge' convention
	788	!-- describes the actual total size of topography which is defined at the
	789	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	790	!-- on the topography walls in y-direction. However, PALM uses individual
	791	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	792	!-- Therefore, the extent of topography in nzb_local is now reduced by
	793	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	794	!-- to form the basis for nzb_s_inner.
	795	DO j = -gls, ny + gls
	796	DO i = -gls, nx
	797	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	798	ENDDO
[134]	799	ENDDO
[217]	800	!-- apply cyclic boundary conditions in x-direction
	801	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	802	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	803	DO i = -gls, nx + gls
	804	DO j = -gls, ny
	805	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	806	ENDDO
[134]	807	ENDDO
[217]	808	!-- apply cyclic boundary conditions in y-direction
	809	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	810	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	811	ENDIF
[134]	812
[1]	813	!
	814	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	815	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	816	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	817
	818	!
	819	!-- Initialize remaining index arrays:
	820	!-- first pre-initialize them with nzb_s_inner...
	821	nzb_u_inner = nzb_s_inner
	822	nzb_u_outer = nzb_s_inner
	823	nzb_v_inner = nzb_s_inner
	824	nzb_v_outer = nzb_s_inner
	825	nzb_w_outer = nzb_s_inner
	826	nzb_s_outer = nzb_s_inner
	827
	828	!
	829	!-- ...then extend pre-initialized arrays in their according directions
	830	!-- based on nzb_local using nzb_tmp as a temporary global index array
	831
	832	!
	833	!-- nzb_s_outer:
	834	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	835	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	836	DO j = -1, ny + 1
	837	DO i = 0, nx
[1353]	838	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	839	nzb_local(j,i+1) )
	840	ENDDO
	841	ENDDO
	842	DO i = nxl, nxr
	843	DO j = nys, nyn
[1353]	844	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	845	nzb_tmp(j+1,i) )
	846	ENDDO
	847	!
	848	!-- non-cyclic boundary conditions (overwritten by call of
	849	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	850	IF ( nys == 0 ) THEN
	851	j = -1
	852	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	853	ENDIF
[1743]	854	IF ( nyn == ny ) THEN
[1]	855	j = ny + 1
	856	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	857	ENDIF
	858	ENDDO
	859	!
	860	!-- nzb_w_outer:
	861	!-- identical to nzb_s_outer
	862	nzb_w_outer = nzb_s_outer
	863
	864	!
	865	!-- nzb_u_inner:
	866	!-- extend nzb_local rightwards only
[667]	867	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	868	DO j = -1, ny + 1
	869	DO i = 0, nx + 1
	870	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	871	ENDDO
	872	ENDDO
[667]	873	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	874
	875	!
	876	!-- nzb_u_outer:
	877	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	878	DO i = nxl, nxr
	879	DO j = nys, nyn
[1353]	880	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	881	nzb_tmp(j+1,i) )
	882	ENDDO
	883	!
	884	!-- non-cyclic boundary conditions (overwritten by call of
	885	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	886	IF ( nys == 0 ) THEN
	887	j = -1
	888	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	889	ENDIF
[1743]	890	IF ( nyn == ny ) THEN
[1]	891	j = ny + 1
	892	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	893	ENDIF
	894	ENDDO
	895
	896	!
	897	!-- nzb_v_inner:
	898	!-- extend nzb_local northwards only
[667]	899	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	900	DO i = -1, nx + 1
	901	DO j = 0, ny + 1
	902	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	903	ENDDO
	904	ENDDO
[667]	905	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	906
	907	!
	908	!-- nzb_v_outer:
	909	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	910	DO j = nys, nyn
	911	DO i = nxl, nxr
[1353]	912	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	913	nzb_tmp(j,i+1) )
	914	ENDDO
	915	!
	916	!-- non-cyclic boundary conditions (overwritten by call of
	917	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	918	IF ( nxl == 0 ) THEN
	919	i = -1
	920	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	921	ENDIF
	922	IF ( nxr == nx ) THEN
	923	i = nx + 1
	924	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	925	ENDIF
	926	ENDDO
[809]	927	#if ! defined ( __check )
[1]	928	!
	929	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	930	!-- boundary conditions, if applicable.
	931	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	932	!-- they do not require exchange and are not included here.
	933	CALL exchange_horiz_2d_int( nzb_u_inner )
	934	CALL exchange_horiz_2d_int( nzb_u_outer )
	935	CALL exchange_horiz_2d_int( nzb_v_inner )
	936	CALL exchange_horiz_2d_int( nzb_v_outer )
	937	CALL exchange_horiz_2d_int( nzb_w_outer )
	938	CALL exchange_horiz_2d_int( nzb_s_outer )
	939
[49]	940	!
	941	!-- Allocate and set the arrays containing the topography height
	942	IF ( myid == 0 ) THEN
	943
	944	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	945
	946	DO i = 0, nx + 1
	947	DO j = 0, ny + 1
	948	zu_s_inner(i,j) = zu(nzb_local(j,i))
	949	zw_w_inner(i,j) = zw(nzb_local(j,i))
	950	ENDDO
	951	ENDDO
	952
	953	ENDIF
[1221]	954	!
	955	!-- Set flag arrays to be used for masking of grid points
	956	DO i = nxlg, nxrg
	957	DO j = nysg, nyng
	958	DO k = nzb, nzt+1
[1353]	959	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	960	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	961	ENDDO
	962	ENDDO
	963	ENDDO
[807]	964	#endif
[1]	965	ENDIF
	966
[809]	967	#if ! defined ( __check )
[1]	968	!
	969	!-- Preliminary: to be removed after completion of the topography code!
	970	!-- Set the former default k index arrays nzb_2d
	971	nzb_2d = nzb
	972
	973	!
	974	!-- Set the individual index arrays which define the k index from which on
	975	!-- the usual finite difference form (which does not use surface fluxes) is
	976	!-- applied
[1691]	977	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	978	nzb_diff_u = nzb_u_inner + 2
	979	nzb_diff_v = nzb_v_inner + 2
	980	nzb_diff_s_inner = nzb_s_inner + 2
	981	nzb_diff_s_outer = nzb_s_outer + 2
	982	ELSE
	983	nzb_diff_u = nzb_u_inner + 1
	984	nzb_diff_v = nzb_v_inner + 1
	985	nzb_diff_s_inner = nzb_s_inner + 1
	986	nzb_diff_s_outer = nzb_s_outer + 1
	987	ENDIF
	988
	989	!
	990	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	991	!-- for limitation of near-wall mixing length l_wall further below
	992	corner_nl = 0
	993	corner_nr = 0
	994	corner_sl = 0
	995	corner_sr = 0
	996	wall_l = 0
	997	wall_n = 0
	998	wall_r = 0
	999	wall_s = 0
	1000
	1001	DO i = nxl, nxr
	1002	DO j = nys, nyn
	1003	!
	1004	!-- u-component
	1005	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1006	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1007	fym(j,i) = 0.0_wp
	1008	fyp(j,i) = 1.0_wp
[1]	1009	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1010	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1011	fym(j,i) = 1.0_wp
	1012	fyp(j,i) = 0.0_wp
[1]	1013	ENDIF
	1014	!
	1015	!-- v-component
	1016	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1017	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1018	fxm(j,i) = 0.0_wp
	1019	fxp(j,i) = 1.0_wp
[1]	1020	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1021	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1022	fxm(j,i) = 1.0_wp
	1023	fxp(j,i) = 0.0_wp
[1]	1024	ENDIF
	1025	!
	1026	!-- w-component, also used for scalars, separate arrays for shear
	1027	!-- production of tke
	1028	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1029	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1030	wall_w_y(j,i) = 1.0_wp
	1031	fwym(j,i) = 0.0_wp
	1032	fwyp(j,i) = 1.0_wp
[1]	1033	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1034	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1035	wall_w_y(j,i) = 1.0_wp
	1036	fwym(j,i) = 1.0_wp
	1037	fwyp(j,i) = 0.0_wp
[1]	1038	ENDIF
	1039	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1040	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1041	wall_w_x(j,i) = 1.0_wp
	1042	fwxm(j,i) = 0.0_wp
	1043	fwxp(j,i) = 1.0_wp
[1]	1044	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1045	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1046	wall_w_x(j,i) = 1.0_wp
	1047	fwxm(j,i) = 1.0_wp
	1048	fwxp(j,i) = 0.0_wp
[1]	1049	ENDIF
	1050	!
	1051	!-- Wall and corner locations inside buildings for limitation of
	1052	!-- near-wall mixing length l_wall
	1053	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1054
	1055	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1056
	1057	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1058	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft 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_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright 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-1,i) ) THEN
	1070
	1071	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1072	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1073	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1074	nzb_s_inner(j,i-1) ) + 1
	1075	ENDIF
	1076
	1077	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1078	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1079	nzb_s_inner(j,i+1) ) + 1
	1080	ENDIF
	1081
	1082	ENDIF
	1083
	1084	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1085	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1086	ENDIF
	1087
	1088	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1089	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1090	ENDIF
	1091
	1092	ENDDO
	1093	ENDDO
	1094
	1095	!
[114]	1096	!-- Calculate wall flag arrays for the multigrid method
[1575]	1097	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1098	!
	1099	!-- Gridpoint increment of the current level
	1100	inc = 1
	1101
	1102	DO l = maximum_grid_level, 1 , -1
	1103
	1104	nxl_l = nxl_mg(l)
	1105	nxr_l = nxr_mg(l)
	1106	nys_l = nys_mg(l)
	1107	nyn_l = nyn_mg(l)
	1108	nzt_l = nzt_mg(l)
	1109
	1110	!
	1111	!-- Assign the flag level to be calculated
	1112	SELECT CASE ( l )
	1113	CASE ( 1 )
	1114	flags => wall_flags_1
	1115	CASE ( 2 )
	1116	flags => wall_flags_2
	1117	CASE ( 3 )
	1118	flags => wall_flags_3
	1119	CASE ( 4 )
	1120	flags => wall_flags_4
	1121	CASE ( 5 )
	1122	flags => wall_flags_5
	1123	CASE ( 6 )
	1124	flags => wall_flags_6
	1125	CASE ( 7 )
	1126	flags => wall_flags_7
	1127	CASE ( 8 )
	1128	flags => wall_flags_8
	1129	CASE ( 9 )
	1130	flags => wall_flags_9
	1131	CASE ( 10 )
	1132	flags => wall_flags_10
	1133	END SELECT
	1134
	1135	!
	1136	!-- Depending on the grid level, set the respective bits in case of
	1137	!-- neighbouring walls
	1138	!-- Bit 0: wall to the bottom
	1139	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1140	!-- Bit 2: wall to the south
	1141	!-- Bit 3: wall to the north
	1142	!-- Bit 4: wall to the left
	1143	!-- Bit 5: wall to the right
[116]	1144	!-- Bit 6: inside building
[114]	1145
	1146	flags = 0
	1147
[927]	1148	!
	1149	!-- In case of masking method, flags are not set and multigrid method
	1150	!-- works like FFT-solver
	1151	IF ( .NOT. masking_method ) THEN
	1152
	1153	DO i = nxl_l-1, nxr_l+1
	1154	DO j = nys_l-1, nyn_l+1
	1155	DO k = nzb, nzt_l+1
[114]	1156
	1157	!
[927]	1158	!-- Inside/outside building (inside building does not need
	1159	!-- further tests for walls)
	1160	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1161
[927]	1162	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1163
[927]	1164	ELSE
[114]	1165	!
[927]	1166	!-- Bottom wall
	1167	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1168	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1169	ENDIF
[114]	1170	!
[927]	1171	!-- South wall
	1172	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1173	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1174	ENDIF
[114]	1175	!
[927]	1176	!-- North wall
	1177	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1178	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1179	ENDIF
[114]	1180	!
[927]	1181	!-- Left wall
	1182	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1183	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1184	ENDIF
[114]	1185	!
[927]	1186	!-- Right wall
	1187	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1188	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1189	ENDIF
	1190
[114]	1191	ENDIF
	1192
[927]	1193	ENDDO
[114]	1194	ENDDO
	1195	ENDDO
	1196
[927]	1197	ENDIF
	1198
[114]	1199	!
	1200	!-- Test output of flag arrays
[145]	1201	! i = nxl_l
	1202	! WRITE (9,*) ' '
	1203	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1204	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1205	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1206	! DO k = nzt_l+1, nzb, -1
	1207	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1208	! ENDDO
[114]	1209
	1210	inc = inc * 2
	1211
	1212	ENDDO
	1213
	1214	ENDIF
[861]	1215	!
	1216	!-- Allocate flags needed for masking walls.
[1677]	1217	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1218	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1219	wall_flags_0 = 0
	1220	wall_flags_00 = 0
[114]	1221
[1557]	1222	IF ( scalar_advec == 'ws-scheme' .OR. &
	1223	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1224	!
[861]	1225	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1226	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1227	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1228	!-- grid points.
	1229	DO i = nxl, nxr
	1230	DO j = nys, nyn
	1231	DO k = nzb_s_inner(j,i)+1, nzt
	1232	!
	1233	!-- scalar - x-direction
	1234	!-- WS1 (0), WS3 (1), WS5 (2)
[1762]	1235	IF ( k <= nzb_s_inner(j,i+1) .OR. &
	1236	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1237	.AND. i == nxl ) .OR. &
	1238	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1239	.AND. i == nxr ) ) &
	1240	THEN
[861]	1241	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1242	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[1762]	1243	.OR. &
	1244	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1245	.AND. i == nxr-1 ) .OR. &
	1246	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1247	.AND. i == nxlu ) ) &
	1248	THEN
[861]	1249	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1250	ELSE
	1251	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1252	ENDIF
	1253	!
	1254	!-- scalar - y-direction
	1255	!-- WS1 (3), WS3 (4), WS5 (5)
[1762]	1256	IF ( k <= nzb_s_inner(j+1,i) .OR. &
	1257	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1258	.AND. j == nys ) .OR. &
	1259	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1260	.AND. j == nyn ) ) &
	1261	THEN
[861]	1262	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
[1762]	1263	!
[861]	1264	!-- WS3
	1265	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[1762]	1266	.OR. &
	1267	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1268	.AND. j == nysv ) .OR. &
	1269	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1270	.AND. j == nyn-1 ) ) &
	1271	THEN
[861]	1272	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
[1762]	1273	!
[861]	1274	!-- WS5
	1275	ELSE
	1276	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1277	ENDIF
	1278	!
	1279	!-- scalar - z-direction
	1280	!-- WS1 (6), WS3 (7), WS5 (8)
	1281	flag_set = .FALSE.
	1282	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1283	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1284	flag_set = .TRUE.
	1285	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1286	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1287	flag_set = .TRUE.
	1288	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1289	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1290	ENDIF
	1291	ENDDO
	1292	ENDDO
	1293	ENDDO
	1294	ENDIF
	1295
	1296	IF ( momentum_advec == 'ws-scheme' ) THEN
	1297	!
	1298	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1299	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1300	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1301	!-- grid points.
	1302	DO i = nxl, nxr
	1303	DO j = nys, nyn
[1580]	1304	DO k = nzb+1, nzt
[861]	1305	!
[1580]	1306	!-- At first, set flags to WS1.
	1307	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1308	!-- in order to handle the left/south flux.
	1309	!-- near vertical walls.
	1310	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1311	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1312	!
[861]	1313	!-- u component - x-direction
	1314	!-- WS1 (9), WS3 (10), WS5 (11)
[1762]	1315	IF ( k <= nzb_u_inner(j,i+1) .OR. &
	1316	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1317	.AND. i <= nxlu ) .OR. &
	1318	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1319	.AND. i == nxr ) ) &
	1320	THEN
[1580]	1321	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[1762]	1322	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
	1323	.OR. &
	1324	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1325	.AND. i == nxr-1 ) .OR. &
	1326	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1327	.AND. i == nxlu+1) ) &
	1328	THEN
[861]	1329	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1330	!
	1331	!-- Clear flag for WS1
	1332	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1333	ELSE
	1334	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1335	!
	1336	!-- Clear flag for WS1
	1337	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1338	ENDIF
	1339	!
	1340	!-- u component - y-direction
	1341	!-- WS1 (12), WS3 (13), WS5 (14)
[1762]	1342	IF ( k <= nzb_u_inner(j+1,i) .OR. &
	1343	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1344	.AND. j == nys ) .OR. &
	1345	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1346	.AND. j == nyn ) ) &
	1347	THEN
	1348	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1349	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[1762]	1350	.OR. &
	1351	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1352	.AND. j == nysv ) .OR. &
	1353	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1354	.AND. j == nyn-1 ) ) &
	1355	THEN
[861]	1356	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1357	!
	1358	!-- Clear flag for WS1
	1359	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1360	ELSE
	1361	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1362	!
	1363	!-- Clear flag for WS1
	1364	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1365	ENDIF
	1366	!
	1367	!-- u component - z-direction
	1368	!-- WS1 (15), WS3 (16), WS5 (17)
	1369	flag_set = .FALSE.
	1370	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1371	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1372	flag_set = .TRUE.
	1373	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1374	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1375	flag_set = .TRUE.
	1376	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1377	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1378	ENDIF
	1379
	1380	ENDDO
	1381	ENDDO
	1382	ENDDO
	1383
	1384	DO i = nxl, nxr
	1385	DO j = nys, nyn
[1580]	1386	DO k = nzb+1, nzt
[861]	1387	!
[1580]	1388	!-- At first, set flags to WS1.
	1389	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1390	!-- in order to handle the left/south flux.
	1391	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1392	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1393	!
[861]	1394	!-- v component - x-direction
	1395	!-- WS1 (18), WS3 (19), WS5 (20)
[1762]	1396	IF ( k <= nzb_v_inner(j,i+1) .OR. &
	1397	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1398	.AND. i == nxl ) .OR. &
	1399	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1400	.AND. i == nxr ) ) &
	1401	THEN
	1402	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1403	!
[861]	1404	!-- WS3
	1405	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[1762]	1406	.OR. &
	1407	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1408	.AND. i == nxr-1 ) .OR. &
	1409	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1410	.AND. i == nxlu ) ) &
	1411	THEN
[861]	1412	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1413	!
	1414	!-- Clear flag for WS1
	1415	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1416	ELSE
	1417	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1418	!
	1419	!-- Clear flag for WS1
	1420	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1421	ENDIF
	1422	!
	1423	!-- v component - y-direction
	1424	!-- WS1 (21), WS3 (22), WS5 (23)
[1762]	1425	IF ( k <= nzb_v_inner(j+1,i) .OR. &
	1426	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1427	.AND. j <= nysv ) .OR. &
	1428	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1429	.AND. j == nyn ) ) &
	1430	THEN
	1431	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1432	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[1762]	1433	.OR. &
	1434	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1435	.AND. j == nysv+1) .OR. &
	1436	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1437	.AND. j == nyn-1 ) ) &
	1438	THEN
[861]	1439	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1440	!
	1441	!-- Clear flag for WS1
	1442	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1443	ELSE
	1444	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1445	!
	1446	!-- Clear flag for WS1
	1447	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1448	ENDIF
	1449	!
	1450	!-- v component - z-direction
	1451	!-- WS1 (24), WS3 (25), WS5 (26)
	1452	flag_set = .FALSE.
	1453	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1454	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1455	flag_set = .TRUE.
	1456	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1457	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1458	flag_set = .TRUE.
	1459	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1460	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1461	ENDIF
	1462
	1463	ENDDO
	1464	ENDDO
	1465	ENDDO
	1466	DO i = nxl, nxr
	1467	DO j = nys, nyn
[1580]	1468	DO k = nzb+1, nzt
[861]	1469	!
[1580]	1470	!-- At first, set flags to WS1.
	1471	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1472	!-- in order to handle the left/south flux.
	1473	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1474	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1475	!
[861]	1476	!-- w component - x-direction
	1477	!-- WS1 (27), WS3 (28), WS5 (29)
[1762]	1478	IF ( k <= nzb_w_inner(j,i+1) .OR. &
	1479	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1480	.AND. i == nxl ) .OR. &
	1481	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1482	.AND. i == nxr ) ) &
	1483	THEN
	1484	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1485	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[1762]	1486	.OR. &
	1487	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1488	.AND. i == nxr-1 ) .OR. &
	1489	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1490	.AND. i == nxlu ) ) &
	1491	THEN
[861]	1492	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1493	!
	1494	!-- Clear flag for WS1
	1495	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1496	ELSE
	1497	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1498	!
	1499	!-- Clear flag for WS1
	1500	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1501	ENDIF
	1502	!
	1503	!-- w component - y-direction
	1504	!-- WS1 (30), WS3 (31), WS5 (32)
[1762]	1505	IF ( k <= nzb_w_inner(j+1,i) .OR. &
	1506	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1507	.AND. j == nys ) .OR. &
	1508	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1509	.AND. j == nyn ) ) &
	1510	THEN
	1511	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1512	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[1762]	1513	.OR. &
	1514	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1515	.AND. j == nysv ) .OR. &
	1516	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1517	.AND. j == nyn-1 ) ) &
	1518	THEN
[861]	1519	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1520	!
	1521	!-- Clear flag for WS1
	1522	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1523	ELSE
[1221]	1524	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1525	!
	1526	!-- Clear flag for WS1
	1527	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1528	ENDIF
	1529	!
	1530	!-- w component - z-direction
[1679]	1531	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1532	flag_set = .FALSE.
	1533	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1534	.OR. k == nzt ) THEN
	1535	!
	1536	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1537	!-- set, although this is not a prognostic level. However,
	1538	!-- contrary to the advection of u,v and s this is necessary
	1539	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1540	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1541	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1542	flag_set = .TRUE.
	1543	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1544	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1545	flag_set = .TRUE.
	1546	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1547	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1548	ENDIF
	1549
	1550	ENDDO
	1551	ENDDO
	1552	ENDDO
	1553
	1554	ENDIF
	1555
	1556	!
[1677]	1557	!-- Exchange 3D integer wall_flags.
	1558	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1559	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1560	!
	1561	!-- Exchange ghost points for advection flags
	1562	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1563	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1564	!
	1565	!-- Set boundary flags at inflow and outflow boundary in case of
	1566	!-- non-cyclic boundary conditions.
[1762]	1567	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1677]	1568	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1569	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1570	ENDIF
	1571
[1762]	1572	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
[1677]	1573	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1574	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1575	ENDIF
	1576
[1762]	1577	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
[1677]	1578	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1579	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1580	ENDIF
	1581
[1762]	1582	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1677]	1583	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1584	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1585	ENDIF
	1586
	1587	ENDIF
	1588
	1589	!
[1]	1590	!-- In case of topography: limit near-wall mixing length l_wall further:
	1591	!-- Go through all points of the subdomain one by one and look for the closest
	1592	!-- surface
	1593	IF ( TRIM(topography) /= 'flat' ) THEN
	1594	DO i = nxl, nxr
	1595	DO j = nys, nyn
	1596
	1597	nzb_si = nzb_s_inner(j,i)
	1598	vi = vertical_influence(nzb_si)
	1599
	1600	IF ( wall_n(j,i) > 0 ) THEN
	1601	!
	1602	!-- North wall (y distance)
	1603	DO k = wall_n(j,i), nzb_si
[1353]	1604	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1605	ENDDO
	1606	!
	1607	!-- Above North wall (yz distance)
	1608	DO k = nzb_si + 1, nzb_si + vi
[1353]	1609	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1610	SQRT( 0.25_wp * dy**2 + &
[1]	1611	( zu(k) - zw(nzb_si) )**2 ) )
	1612	ENDDO
	1613	!
	1614	!-- Northleft corner (xy distance)
	1615	IF ( corner_nl(j,i) > 0 ) THEN
	1616	DO k = corner_nl(j,i), nzb_si
	1617	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1618	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1619	ENDDO
	1620	!
	1621	!-- Above Northleft corner (xyz distance)
	1622	DO k = nzb_si + 1, nzb_si + vi
[1353]	1623	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1624	SQRT( 0.25_wp * (dx2 + dy2) + &
	1625	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1626	ENDDO
	1627	ENDIF
	1628	!
	1629	!-- Northright corner (xy distance)
	1630	IF ( corner_nr(j,i) > 0 ) THEN
	1631	DO k = corner_nr(j,i), nzb_si
[1353]	1632	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1633	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1634	ENDDO
	1635	!
	1636	!-- Above northright corner (xyz distance)
	1637	DO k = nzb_si + 1, nzb_si + vi
[1353]	1638	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1639	SQRT( 0.25_wp * (dx2 + dy2) + &
	1640	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1641	ENDDO
	1642	ENDIF
	1643	ENDIF
	1644
	1645	IF ( wall_s(j,i) > 0 ) THEN
	1646	!
	1647	!-- South wall (y distance)
	1648	DO k = wall_s(j,i), nzb_si
[1353]	1649	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1650	ENDDO
	1651	!
	1652	!-- Above south wall (yz distance)
[1353]	1653	DO k = nzb_si + 1, nzb_si + vi
	1654	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1655	SQRT( 0.25_wp * dy**2 + &
[1]	1656	( zu(k) - zw(nzb_si) )**2 ) )
	1657	ENDDO
	1658	!
	1659	!-- Southleft corner (xy distance)
	1660	IF ( corner_sl(j,i) > 0 ) THEN
	1661	DO k = corner_sl(j,i), nzb_si
[1353]	1662	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1663	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1664	ENDDO
	1665	!
	1666	!-- Above southleft corner (xyz distance)
	1667	DO k = nzb_si + 1, nzb_si + vi
[1353]	1668	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1669	SQRT( 0.25_wp * (dx2 + dy2) + &
	1670	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1671	ENDDO
	1672	ENDIF
	1673	!
	1674	!-- Southright corner (xy distance)
	1675	IF ( corner_sr(j,i) > 0 ) THEN
	1676	DO k = corner_sr(j,i), nzb_si
[1353]	1677	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1678	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1679	ENDDO
	1680	!
	1681	!-- Above southright corner (xyz distance)
	1682	DO k = nzb_si + 1, nzb_si + vi
[1353]	1683	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1684	SQRT( 0.25_wp * (dx2 + dy2) + &
	1685	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1686	ENDDO
	1687	ENDIF
	1688
	1689	ENDIF
	1690
	1691	IF ( wall_l(j,i) > 0 ) THEN
	1692	!
	1693	!-- Left wall (x distance)
	1694	DO k = wall_l(j,i), nzb_si
[1353]	1695	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1696	ENDDO
	1697	!
	1698	!-- Above left wall (xz distance)
	1699	DO k = nzb_si + 1, nzb_si + vi
[1353]	1700	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1701	SQRT( 0.25_wp * dx**2 + &
	1702	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1703	ENDDO
	1704	ENDIF
	1705
	1706	IF ( wall_r(j,i) > 0 ) THEN
	1707	!
	1708	!-- Right wall (x distance)
	1709	DO k = wall_r(j,i), nzb_si
[1353]	1710	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1711	ENDDO
	1712	!
	1713	!-- Above right wall (xz distance)
	1714	DO k = nzb_si + 1, nzb_si + vi
[1353]	1715	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1716	SQRT( 0.25_wp * dx**2 + &
[1]	1717	( zu(k) - zw(nzb_si) )**2 ) )
	1718	ENDDO
	1719
	1720	ENDIF
	1721
	1722	ENDDO
	1723	ENDDO
	1724
	1725	ENDIF
	1726
	1727	!
	1728	!-- Multiplication with wall_adjustment_factor
	1729	l_wall = wall_adjustment_factor * l_wall
	1730
	1731	!
[709]	1732	!-- Set lateral boundary conditions for l_wall
[667]	1733	CALL exchange_horiz( l_wall, nbgp )
	1734
[1]	1735	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1736	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1737
[807]	1738	#endif
[1]	1739
	1740	END SUBROUTINE init_grid

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