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source: palm/trunk/SOURCE/init_grid.f90 @ 1661

Last change on this file since 1661 was 1660, checked in by gronemeier, 9 years ago
Bugfix: Definition of topography height in case of grid stretching
Property svn:keywords set to `Id`
File size: 63.4 KB

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

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