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source: palm/trunk/SOURCE/init_grid.f90 @ 1673

Last change on this file since 1673 was 1662, checked in by gronemeier, 9 years ago
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[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	! -----------------
[1581]	22	!
[1662]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1662 2015-09-21 08:19:00Z raasch $
	27	!
[1662]	28	! 1660 2015-09-21 08:15:16Z gronemeier
	29	! Bugfix: Definition of topography grid levels if vertical grid stretching
	30	! starts below the maximum topography height.
	31	!
[1581]	32	! 1580 2015-04-10 13:43:49Z suehring
	33	! Bugfix: setting flags for 5th order scheme near buildings
	34	!
[1576]	35	! 1575 2015-03-27 09:56:27Z raasch
	36	! adjustments for psolver-queries
	37	!
[1558]	38	! 1557 2015-03-05 16:43:04Z suehring
	39	! Adjustment for monotoinic limiter
	40	!
[1419]	41	! 1418 2014-06-06 13:05:08Z fricke
	42	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	43	! condition and a negative value for dz_stretch_level the condition
	44	! was always true for the whole model domain
	45	!
[1410]	46	! 1409 2014-05-23 12:11:32Z suehring
	47	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	48	! j <= nysv
	49	!
[1354]	50	! 1353 2014-04-08 15:21:23Z heinze
	51	! REAL constants provided with KIND-attribute
	52	!
[1323]	53	! 1322 2014-03-20 16:38:49Z raasch
	54	! REAL constants defined as wp-kind
	55	!
[1321]	56	! 1320 2014-03-20 08:40:49Z raasch
[1320]	57	! ONLY-attribute added to USE-statements,
	58	! kind-parameters added to all INTEGER and REAL declaration statements,
	59	! kinds are defined in new module kinds,
	60	! revision history before 2012 removed,
	61	! comment fields (!:) to be used for variable explanations added to
	62	! all variable declaration statements
[1321]	63	!
[1222]	64	! 1221 2013-09-10 08:59:13Z raasch
	65	! wall_flags_00 introduced to hold bits 32-63,
	66	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	67	! loops optimized for openACC (pres + flow_statistics)
	68	!
[1093]	69	! 1092 2013-02-02 11:24:22Z raasch
	70	! unused variables removed
	71	!
[1070]	72	! 1069 2012-11-28 16:18:43Z maronga
	73	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	74	! model in case of coupled runs
	75	!
[1037]	76	! 1036 2012-10-22 13:43:42Z raasch
	77	! code put under GPL (PALM 3.9)
	78	!
[1017]	79	! 1015 2012-09-27 09:23:24Z raasch
	80	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	81	! nzb_w_inner+1
	82	!
[997]	83	! 996 2012-09-07 10:41:47Z raasch
	84	! little reformatting
	85	!
[979]	86	! 978 2012-08-09 08:28:32Z fricke
	87	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	88	! Bugfix: Set wall_flags_0 for inflow boundary
	89	!
[928]	90	! 927 2012-06-06 19:15:04Z raasch
	91	! Wall flags are not set for multigrid method in case of masking method
	92	!
[865]	93	! 864 2012-03-27 15:10:33Z gryschka
[927]	94	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	95	! were not correctly defined for k=1.
[865]	96	!
[863]	97	! 861 2012-03-26 14:18:34Z suehring
[861]	98	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	99	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	100	! model domain.!
[861]	101	! Initialization of nzb_s_inner and nzb_w_inner.
	102	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	103	! while setting wall_flags_0
	104	!
[844]	105	! 843 2012-02-29 15:16:21Z gryschka
	106	! In case of ocean and dirichlet bc for u and v at the bottom
	107	! the first u-level ist defined at same height as the first w-level
	108	!
[819]	109	! 818 2012-02-08 16:11:23Z maronga
	110	! Bugfix: topo_height is only required if topography is used. It is thus now
	111	! allocated in the topography branch
	112	!
[810]	113	! 809 2012-01-30 13:32:58Z maronga
	114	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	115	!
[808]	116	! 807 2012-01-25 11:53:51Z maronga
	117	! New cpp directive "__check" implemented which is used by check_namelist_files
	118	!
[1]	119	! Revision 1.1 1997/08/11 06:17:45 raasch
	120	! Initial revision (Testversion)
	121	!
	122	!
	123	! Description:
	124	! ------------
	125	! Creating grid depending constants
	126	!------------------------------------------------------------------------------!
	127
[1320]	128	USE arrays_3d, &
	129	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	130	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	131
[1353]	132	USE control_parameters, &
[1320]	133	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	134	building_length_y, building_wall_left, building_wall_south, &
	135	canyon_height, canyon_wall_left, canyon_wall_south, &
	136	canyon_width_x, canyon_width_y, coupling_char, dp_level_ind_b, &
	137	dz, dz_max, dz_stretch_factor, dz_stretch_level, &
	138	dz_stretch_level_index, ibc_uv_b, io_blocks, io_group, &
	139	inflow_l, inflow_n, inflow_r, inflow_s, masking_method, &
	140	maximum_grid_level, message_string, momentum_advec, ocean, &
	141	outflow_l, outflow_n, outflow_r, outflow_s, prandtl_layer, &
	142	psolver, scalar_advec, topography, topography_grid_convention, &
	143	use_surface_fluxes, use_top_fluxes, wall_adjustment_factor
	144
	145	USE grid_variables, &
	146	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	147	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	148	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	149
	150	USE indices, &
	151	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	152	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	153	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	154	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	155	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	156	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	157	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	158	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	159	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	160	wall_flags_9
	161
	162	USE kinds
	163
[1]	164	USE pegrid
	165
	166	IMPLICIT NONE
	167
[1320]	168	INTEGER(iwp) :: bh !:
	169	INTEGER(iwp) :: blx !:
	170	INTEGER(iwp) :: bly !:
	171	INTEGER(iwp) :: bxl !:
	172	INTEGER(iwp) :: bxr !:
	173	INTEGER(iwp) :: byn !:
	174	INTEGER(iwp) :: bys !:
	175	INTEGER(iwp) :: ch !:
	176	INTEGER(iwp) :: cwx !:
	177	INTEGER(iwp) :: cwy !:
	178	INTEGER(iwp) :: cxl !:
	179	INTEGER(iwp) :: cxr !:
	180	INTEGER(iwp) :: cyn !:
	181	INTEGER(iwp) :: cys !:
	182	INTEGER(iwp) :: gls !:
	183	INTEGER(iwp) :: i !:
	184	INTEGER(iwp) :: ii !:
	185	INTEGER(iwp) :: inc !:
	186	INTEGER(iwp) :: j !:
	187	INTEGER(iwp) :: k !:
	188	INTEGER(iwp) :: l !:
	189	INTEGER(iwp) :: nxl_l !:
	190	INTEGER(iwp) :: nxr_l !:
	191	INTEGER(iwp) :: nyn_l !:
	192	INTEGER(iwp) :: nys_l !:
	193	INTEGER(iwp) :: nzb_si !:
	194	INTEGER(iwp) :: nzt_l !:
	195	INTEGER(iwp) :: vi !:
[1]	196
[1320]	197	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !:
[1]	198
[1320]	199	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !:
	200	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !:
	201	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !:
	202	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !:
	203	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !:
	204	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !:
	205	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !:
	206	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !:
	207	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !:
	208	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !:
[1]	209
[1320]	210	LOGICAL :: flag_set = .FALSE. !:
[861]	211
[1320]	212	REAL(wp) :: dx_l !:
	213	REAL(wp) :: dy_l !:
	214	REAL(wp) :: dz_stretched !:
[1]	215
[1320]	216	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !:
[1]	217
[667]	218
[1]	219	!
[709]	220	!-- Calculation of horizontal array bounds including ghost layers
[667]	221	nxlg = nxl - nbgp
	222	nxrg = nxr + nbgp
	223	nysg = nys - nbgp
	224	nyng = nyn + nbgp
[709]	225
[667]	226	!
[1]	227	!-- Allocate grid arrays
[1353]	228	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	229	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	230
	231	!
	232	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	233	IF ( dz == -1.0_wp ) THEN
[254]	234	message_string = 'missing dz'
	235	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	236	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	237	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	238	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	239	ENDIF
[94]	240
[1]	241	!
[94]	242	!-- Define the vertical grid levels
	243	IF ( .NOT. ocean ) THEN
	244	!
	245	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	246	!-- The second u-level (k=1) corresponds to the top of the
[94]	247	!-- Prandtl-layer.
[667]	248
	249	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	250	zu(0) = 0.0_wp
	251	! zu(0) = - dz * 0.5_wp
[667]	252	ELSE
[1353]	253	zu(0) = - dz * 0.5_wp
[667]	254	ENDIF
[1353]	255	zu(1) = dz * 0.5_wp
[1]	256
[94]	257	dz_stretch_level_index = nzt+1
	258	dz_stretched = dz
	259	DO k = 2, nzt+1
	260	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	261	dz_stretched = dz_stretched * dz_stretch_factor
	262	dz_stretched = MIN( dz_stretched, dz_max )
	263	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	264	ENDIF
	265	zu(k) = zu(k-1) + dz_stretched
	266	ENDDO
[1]	267
	268	!
[94]	269	!-- Compute the w-levels. They are always staggered half-way between the
[843]	270	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	271	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	272	!-- The top w-level is extrapolated linearly.
[1353]	273	zw(0) = 0.0_wp
[94]	274	DO k = 1, nzt
[1353]	275	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	276	ENDDO
[1353]	277	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	278
[94]	279	ELSE
[1]	280	!
[843]	281	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	282	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	283	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	284	!-- w-level are defined at same height, but staggered from the second level.
	285	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	286	zu(nzt+1) = dz * 0.5_wp
	287	zu(nzt) = - dz * 0.5_wp
[94]	288
	289	dz_stretch_level_index = 0
	290	dz_stretched = dz
	291	DO k = nzt-1, 0, -1
[1418]	292	!
	293	!-- The default value of dz_stretch_level is positive, thus the first
	294	!-- condition is always true. Hence, the second condition is necessary.
	295	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	296	.AND. dz_stretched < dz_max ) THEN
[94]	297	dz_stretched = dz_stretched * dz_stretch_factor
	298	dz_stretched = MIN( dz_stretched, dz_max )
	299	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	300	ENDIF
	301	zu(k) = zu(k+1) - dz_stretched
	302	ENDDO
	303
	304	!
	305	!-- Compute the w-levels. They are always staggered half-way between the
[843]	306	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	307	!-- at the ground. In this case the first u- and w-level are defined at
	308	!-- same height. The top w-level (nzt+1) is not used but set for
	309	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	310	zw(nzt+1) = dz
[1353]	311	zw(nzt) = 0.0_wp
[94]	312	DO k = 0, nzt
[1353]	313	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	314	ENDDO
	315
[843]	316	!
	317	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	318	!-- at same height.
	319	IF ( ibc_uv_b == 0 ) THEN
	320	zu(0) = zw(0)
	321	ENDIF
	322
[94]	323	ENDIF
	324
	325	!
[1]	326	!-- Compute grid lengths.
	327	DO k = 1, nzt+1
	328	dzu(k) = zu(k) - zu(k-1)
[1353]	329	ddzu(k) = 1.0_wp / dzu(k)
[1]	330	dzw(k) = zw(k) - zw(k-1)
[1353]	331	ddzw(k) = 1.0_wp / dzw(k)
[1]	332	ENDDO
	333
	334	DO k = 1, nzt
[1353]	335	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	336	ENDDO
[667]	337
	338	!
[709]	339	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	340	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	341	!-- is only dz/2, but should be dz. Therefore, an additional array
	342	!-- containing with appropriate grid information is created for these
	343	!-- solvers.
[1575]	344	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	345	ALLOCATE( ddzu_pres(1:nzt+1) )
	346	ddzu_pres = ddzu
[864]	347	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	348	ENDIF
[1]	349
	350	!
	351	!-- In case of multigrid method, compute grid lengths and grid factors for the
	352	!-- grid levels
[1575]	353	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	354
	355	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	356	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	357	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	358	f1_mg(nzb+1:nzt,maximum_grid_level), &
	359	f2_mg(nzb+1:nzt,maximum_grid_level), &
	360	f3_mg(nzb+1:nzt,maximum_grid_level) )
	361
	362	dzu_mg(:,maximum_grid_level) = dzu
[667]	363	!
[864]	364	!-- Next line to ensure an equally spaced grid.
	365	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	366
[1]	367	dzw_mg(:,maximum_grid_level) = dzw
	368	nzt_l = nzt
	369	DO l = maximum_grid_level-1, 1, -1
[1353]	370	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	371	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	372	nzt_l = nzt_l / 2
	373	DO k = 2, nzt_l+1
	374	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	375	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	376	ENDDO
	377	ENDDO
	378
	379	nzt_l = nzt
	380	dx_l = dx
	381	dy_l = dy
	382	DO l = maximum_grid_level, 1, -1
[1353]	383	ddx2_mg(l) = 1.0_wp / dx_l**2
	384	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	385	DO k = nzb+1, nzt_l
[1353]	386	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	387	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	388	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	389	f2_mg(k,l) + f3_mg(k,l)
	390	ENDDO
	391	nzt_l = nzt_l / 2
[1353]	392	dx_l = dx_l * 2.0_wp
	393	dy_l = dy_l * 2.0_wp
[1]	394	ENDDO
	395
	396	ENDIF
	397
	398	!
	399	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	400	ddx = 1.0_wp / dx
	401	ddy = 1.0_wp / dy
[1]	402	dx2 = dx * dx
	403	dy2 = dy * dy
[1353]	404	ddx2 = 1.0_wp / dx2
	405	ddy2 = 1.0_wp / dy2
[1]	406
	407	!
	408	!-- Compute the grid-dependent mixing length.
	409	DO k = 1, nzt
[1322]	410	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	411	ENDDO
	412
	413	!
	414	!-- Allocate outer and inner index arrays for topography and set
[114]	415	!-- defaults.
	416	!-- nzb_local has to contain additional layers of ghost points for calculating
	417	!-- the flag arrays needed for the multigrid method
	418	gls = 2**( maximum_grid_level )
[861]	419	IF ( gls < nbgp ) gls = nbgp
[667]	420
[114]	421	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	422	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	423	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	424	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	425	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	426	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	427	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	428	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	429	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	430	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	431	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	432	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	433	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	434	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	435	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	436	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	437	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	438	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	439	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	440	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	441	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	442	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	443	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	444	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	445	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	446	wall_e_x(nysg:nyng,nxlg:nxrg), &
	447	wall_e_y(nysg:nyng,nxlg:nxrg), &
	448	wall_u(nysg:nyng,nxlg:nxrg), &
	449	wall_v(nysg:nyng,nxlg:nxrg), &
	450	wall_w_x(nysg:nyng,nxlg:nxrg), &
	451	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	452
	453
[667]	454
	455	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	456
[818]	457
[1]	458	nzb_s_inner = nzb; nzb_s_outer = nzb
	459	nzb_u_inner = nzb; nzb_u_outer = nzb
	460	nzb_v_inner = nzb; nzb_v_outer = nzb
	461	nzb_w_inner = nzb; nzb_w_outer = nzb
	462
[1353]	463	rflags_s_inner = 1.0_wp
	464	rflags_invers = 1.0_wp
[1221]	465
[1]	466	!
[19]	467	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	468	!-- form (which does not use surface fluxes) is applied
	469	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	470	nzb_diff = nzb + 2
	471	ELSE
	472	nzb_diff = nzb + 1
	473	ENDIF
[19]	474	IF ( use_top_fluxes ) THEN
	475	nzt_diff = nzt - 1
	476	ELSE
	477	nzt_diff = nzt
	478	ENDIF
[1]	479
	480	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	481	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	482
[1353]	483	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	484	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	485	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	486	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	487
	488	!
	489	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	490	!-- for the moment,
	491	!-- multiplication with wall_adjustment_factor near the end of this routine
	492	l_wall(nzb,:,:) = l_grid(1)
	493	DO k = nzb+1, nzt
	494	l_wall(k,:,:) = l_grid(k)
	495	ENDDO
	496	l_wall(nzt+1,:,:) = l_grid(nzt)
	497
	498	ALLOCATE ( vertical_influence(nzb:nzt) )
	499	DO k = 1, nzt
	500	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	501	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	502	ENDDO
	503
	504	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	505	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	506	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	507	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	508	'threshold given by only local', &
	509	' &horizontal reduction of near_wall ', &
	510	'mixing length l_wall', &
	511	' &starting from height level k = ', k, '.'
	512	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	513	EXIT
	514	ENDIF
	515	ENDDO
	516	vertical_influence(0) = vertical_influence(1)
	517
[667]	518	DO i = nxlg, nxrg
	519	DO j = nysg, nyng
[1]	520	DO k = nzb_s_inner(j,i) + 1, &
	521	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	522	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	523	ENDDO
	524	ENDDO
	525	ENDDO
	526
	527	!
	528	!-- Set outer and inner index arrays for non-flat topography.
	529	!-- Here consistency checks concerning domain size and periodicity are
	530	!-- necessary.
	531	!-- Within this SELECT CASE structure only nzb_local is initialized
	532	!-- individually depending on the chosen topography type, all other index
	533	!-- arrays are initialized further below.
	534	SELECT CASE ( TRIM( topography ) )
	535
	536	CASE ( 'flat' )
	537	!
[555]	538	!-- nzb_local is required for the multigrid solver
	539	nzb_local = 0
[1]	540
	541	CASE ( 'single_building' )
	542	!
	543	!-- Single rectangular building, by default centered in the middle of the
	544	!-- total domain
	545	blx = NINT( building_length_x / dx )
	546	bly = NINT( building_length_y / dy )
[1660]	547	bh = 0
	548	DO k = 0, nzt
	549	IF ( building_height .GT. zw(k) ) THEN
	550	bh = k+1
	551	ENDIF
	552	ENDDO
[1]	553
[1322]	554	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	555	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	556	ENDIF
	557	bxl = NINT( building_wall_left / dx )
	558	bxr = bxl + blx
	559
[1322]	560	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	561	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	562	ENDIF
	563	bys = NINT( building_wall_south / dy )
	564	byn = bys + bly
	565
	566	!
	567	!-- Building size has to meet some requirements
	568	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	569	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	570	WRITE( message_string, * ) 'inconsistent building parameters:', &
	571	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	572	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	573	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	574	ENDIF
	575
	576	!
[217]	577	!-- Define the building.
[1]	578	nzb_local = 0
[134]	579	nzb_local(bys:byn,bxl:bxr) = bh
[1]	580
[240]	581	CASE ( 'single_street_canyon' )
	582	!
	583	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	584	!-- The canyon is centered in the other direction by default.
[1322]	585	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	586	!
	587	!-- Street canyon in y direction
	588	cwx = NINT( canyon_width_x / dx )
[1322]	589	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	590	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	591	ENDIF
	592	cxl = NINT( canyon_wall_left / dx )
	593	cxr = cxl + cwx
	594
[1322]	595	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	596	!
	597	!-- Street canyon in x direction
	598	cwy = NINT( canyon_width_y / dy )
[1322]	599	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	600	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	601	ENDIF
	602	cys = NINT( canyon_wall_south / dy )
	603	cyn = cys + cwy
	604
	605	ELSE
[254]	606
	607	message_string = 'no street canyon width given'
	608	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	609
[240]	610	ENDIF
	611
[1660]	612	ch = 0
	613	DO k = 0, nzt
	614	IF ( canyon_height .GT. zw(k) ) THEN
	615	ch = k+1
	616	ENDIF
	617	ENDDO
[240]	618	dp_level_ind_b = ch
	619	!
	620	!-- Street canyon size has to meet some requirements
[1322]	621	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	622	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	623	( ch < 3 ) ) THEN
[1353]	624	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	625	'&cxl=', cxl, 'cxr=', cxr, &
	626	'cwx=', cwx, &
[254]	627	'ch=', ch, 'nx=', nx, 'ny=', ny
	628	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	629	ENDIF
[1322]	630	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	631	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	632	( ch < 3 ) ) THEN
[1353]	633	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	634	'&cys=', cys, 'cyn=', cyn, &
	635	'cwy=', cwy, &
[254]	636	'ch=', ch, 'nx=', nx, 'ny=', ny
	637	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	638	ENDIF
	639	ENDIF
[1353]	640	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	641	canyon_width_y /= 9999999.9_wp ) THEN
	642	message_string = 'inconsistent canyon parameters:' // &
	643	'&street canyon can only be oriented' // &
[254]	644	'&either in x- or in y-direction'
	645	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	646	ENDIF
	647
	648	nzb_local = ch
[1322]	649	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	650	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	651	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	652	nzb_local(cys+1:cyn-1,:) = 0
	653	ENDIF
	654
[1]	655	CASE ( 'read_from_file' )
[759]	656
[818]	657	ALLOCATE ( topo_height(0:ny,0:nx) )
	658
[759]	659	DO ii = 0, io_blocks-1
	660	IF ( ii == io_group ) THEN
	661
[1]	662	!
[759]	663	!-- Arbitrary irregular topography data in PALM format (exactly
	664	!-- matching the grid size and total domain size)
[1069]	665	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	666	FORM='FORMATTED', ERR=10 )
	667	DO j = ny, 0, -1
	668	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	669	ENDDO
	670
	671	GOTO 12
	672
[1069]	673	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	674	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	675
[1069]	676	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	677	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	678
	679	12 CLOSE( 90 )
	680
	681	ENDIF
[809]	682	#if defined( __parallel ) && ! defined ( __check )
[759]	683	CALL MPI_BARRIER( comm2d, ierr )
	684	#endif
[559]	685	ENDDO
[759]	686
[1]	687	!
	688	!-- Calculate the index height of the topography
	689	DO i = 0, nx
	690	DO j = 0, ny
[1660]	691	nzb_local(j,i) = 0
	692	DO k = 0, nzt
	693	IF ( topo_height(j,i) .GT. zw(k) ) THEN
	694	nzb_local(j,i) = k+1
	695	ENDIF
	696	ENDDO
[1]	697	ENDDO
	698	ENDDO
[818]	699
	700	DEALLOCATE ( topo_height )
[114]	701	!
[759]	702	!-- Add cyclic boundaries (additional layers are for calculating
	703	!-- flag arrays needed for the multigrid sover)
[114]	704	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	705	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	706	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	707	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	708
[1]	709	CASE DEFAULT
	710	!
	711	!-- The DEFAULT case is reached either if the parameter topography
[217]	712	!-- contains a wrong character string or if the user has defined a special
[1]	713	!-- case in the user interface. There, the subroutine user_init_grid
	714	!-- checks which of these two conditions applies.
[114]	715	CALL user_init_grid( gls, nzb_local )
[1]	716
	717	END SELECT
	718	!
[861]	719	!-- Determine the maximum level of topography. Furthermore it is used for
	720	!-- steering the degradation of order of the applied advection scheme.
[978]	721	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	722	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	723	nzb_max = MAXVAL( nzb_local )
[1353]	724	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[978]	725	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	726	nzb_max = nzt
	727	ENDIF
	728
[861]	729	!
[1]	730	!-- Consistency checks and index array initialization are only required for
[217]	731	!-- non-flat topography, also the initialization of topography height arrays
[49]	732	!-- zu_s_inner and zw_w_inner
[1]	733	IF ( TRIM( topography ) /= 'flat' ) THEN
	734
	735	!
	736	!-- Consistency checks
	737	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	738	WRITE( message_string, * ) 'nzb_local values are outside the', &
	739	'model domain', &
	740	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	741	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	742	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	743	ENDIF
	744
[722]	745	IF ( bc_lr == 'cyclic' ) THEN
[1353]	746	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	747	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	748	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	749	' boundary condition in x-direction'
	750	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	751	ENDIF
	752	ENDIF
[722]	753	IF ( bc_ns == 'cyclic' ) THEN
[1353]	754	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	755	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	756	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	757	' boundary condition in y-direction'
	758	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	759	ENDIF
	760	ENDIF
	761
[217]	762	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	763	!
[217]	764	!-- The array nzb_local as defined using the 'cell_edge' convention
	765	!-- describes the actual total size of topography which is defined at the
	766	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	767	!-- on the topography walls in y-direction. However, PALM uses individual
	768	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	769	!-- Therefore, the extent of topography in nzb_local is now reduced by
	770	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	771	!-- to form the basis for nzb_s_inner.
	772	DO j = -gls, ny + gls
	773	DO i = -gls, nx
	774	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	775	ENDDO
[134]	776	ENDDO
[217]	777	!-- apply cyclic boundary conditions in x-direction
	778	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	779	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	780	DO i = -gls, nx + gls
	781	DO j = -gls, ny
	782	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	783	ENDDO
[134]	784	ENDDO
[217]	785	!-- apply cyclic boundary conditions in y-direction
	786	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	787	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	788	ENDIF
[134]	789
[1]	790	!
	791	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	792	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	793	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	794
	795	!
	796	!-- Initialize remaining index arrays:
	797	!-- first pre-initialize them with nzb_s_inner...
	798	nzb_u_inner = nzb_s_inner
	799	nzb_u_outer = nzb_s_inner
	800	nzb_v_inner = nzb_s_inner
	801	nzb_v_outer = nzb_s_inner
	802	nzb_w_outer = nzb_s_inner
	803	nzb_s_outer = nzb_s_inner
	804
	805	!
	806	!-- ...then extend pre-initialized arrays in their according directions
	807	!-- based on nzb_local using nzb_tmp as a temporary global index array
	808
	809	!
	810	!-- nzb_s_outer:
	811	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	812	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	813	DO j = -1, ny + 1
	814	DO i = 0, nx
[1353]	815	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	816	nzb_local(j,i+1) )
	817	ENDDO
	818	ENDDO
	819	DO i = nxl, nxr
	820	DO j = nys, nyn
[1353]	821	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	822	nzb_tmp(j+1,i) )
	823	ENDDO
	824	!
	825	!-- non-cyclic boundary conditions (overwritten by call of
	826	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	827	IF ( nys == 0 ) THEN
	828	j = -1
	829	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	830	ENDIF
	831	IF ( nys == ny ) THEN
	832	j = ny + 1
	833	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	834	ENDIF
	835	ENDDO
	836	!
	837	!-- nzb_w_outer:
	838	!-- identical to nzb_s_outer
	839	nzb_w_outer = nzb_s_outer
	840
	841	!
	842	!-- nzb_u_inner:
	843	!-- extend nzb_local rightwards only
[667]	844	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	845	DO j = -1, ny + 1
	846	DO i = 0, nx + 1
	847	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	848	ENDDO
	849	ENDDO
[667]	850	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	851
	852	!
	853	!-- nzb_u_outer:
	854	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	855	DO i = nxl, nxr
	856	DO j = nys, nyn
[1353]	857	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	858	nzb_tmp(j+1,i) )
	859	ENDDO
	860	!
	861	!-- non-cyclic boundary conditions (overwritten by call of
	862	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	863	IF ( nys == 0 ) THEN
	864	j = -1
	865	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	866	ENDIF
	867	IF ( nys == ny ) THEN
	868	j = ny + 1
	869	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	870	ENDIF
	871	ENDDO
	872
	873	!
	874	!-- nzb_v_inner:
	875	!-- extend nzb_local northwards only
[667]	876	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	877	DO i = -1, nx + 1
	878	DO j = 0, ny + 1
	879	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	880	ENDDO
	881	ENDDO
[667]	882	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	883
	884	!
	885	!-- nzb_v_outer:
	886	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	887	DO j = nys, nyn
	888	DO i = nxl, nxr
[1353]	889	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	890	nzb_tmp(j,i+1) )
	891	ENDDO
	892	!
	893	!-- non-cyclic boundary conditions (overwritten by call of
	894	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	895	IF ( nxl == 0 ) THEN
	896	i = -1
	897	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	898	ENDIF
	899	IF ( nxr == nx ) THEN
	900	i = nx + 1
	901	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	902	ENDIF
	903	ENDDO
[809]	904	#if ! defined ( __check )
[1]	905	!
	906	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	907	!-- boundary conditions, if applicable.
	908	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	909	!-- they do not require exchange and are not included here.
	910	CALL exchange_horiz_2d_int( nzb_u_inner )
	911	CALL exchange_horiz_2d_int( nzb_u_outer )
	912	CALL exchange_horiz_2d_int( nzb_v_inner )
	913	CALL exchange_horiz_2d_int( nzb_v_outer )
	914	CALL exchange_horiz_2d_int( nzb_w_outer )
	915	CALL exchange_horiz_2d_int( nzb_s_outer )
	916
[49]	917	!
	918	!-- Allocate and set the arrays containing the topography height
	919	IF ( myid == 0 ) THEN
	920
	921	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	922
	923	DO i = 0, nx + 1
	924	DO j = 0, ny + 1
	925	zu_s_inner(i,j) = zu(nzb_local(j,i))
	926	zw_w_inner(i,j) = zw(nzb_local(j,i))
	927	ENDDO
	928	ENDDO
	929
	930	ENDIF
[1221]	931	!
	932	!-- Set flag arrays to be used for masking of grid points
	933	DO i = nxlg, nxrg
	934	DO j = nysg, nyng
	935	DO k = nzb, nzt+1
[1353]	936	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	937	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	938	ENDDO
	939	ENDDO
	940	ENDDO
[807]	941	#endif
[1]	942	ENDIF
	943
[809]	944	#if ! defined ( __check )
[1]	945	!
	946	!-- Preliminary: to be removed after completion of the topography code!
	947	!-- Set the former default k index arrays nzb_2d
	948	nzb_2d = nzb
	949
	950	!
	951	!-- Set the individual index arrays which define the k index from which on
	952	!-- the usual finite difference form (which does not use surface fluxes) is
	953	!-- applied
	954	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	955	nzb_diff_u = nzb_u_inner + 2
	956	nzb_diff_v = nzb_v_inner + 2
	957	nzb_diff_s_inner = nzb_s_inner + 2
	958	nzb_diff_s_outer = nzb_s_outer + 2
	959	ELSE
	960	nzb_diff_u = nzb_u_inner + 1
	961	nzb_diff_v = nzb_v_inner + 1
	962	nzb_diff_s_inner = nzb_s_inner + 1
	963	nzb_diff_s_outer = nzb_s_outer + 1
	964	ENDIF
	965
	966	!
	967	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	968	!-- for limitation of near-wall mixing length l_wall further below
	969	corner_nl = 0
	970	corner_nr = 0
	971	corner_sl = 0
	972	corner_sr = 0
	973	wall_l = 0
	974	wall_n = 0
	975	wall_r = 0
	976	wall_s = 0
	977
	978	DO i = nxl, nxr
	979	DO j = nys, nyn
	980	!
	981	!-- u-component
	982	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	983	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	984	fym(j,i) = 0.0_wp
	985	fyp(j,i) = 1.0_wp
[1]	986	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	987	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	988	fym(j,i) = 1.0_wp
	989	fyp(j,i) = 0.0_wp
[1]	990	ENDIF
	991	!
	992	!-- v-component
	993	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	994	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	995	fxm(j,i) = 0.0_wp
	996	fxp(j,i) = 1.0_wp
[1]	997	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	998	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	999	fxm(j,i) = 1.0_wp
	1000	fxp(j,i) = 0.0_wp
[1]	1001	ENDIF
	1002	!
	1003	!-- w-component, also used for scalars, separate arrays for shear
	1004	!-- production of tke
	1005	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1006	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1007	wall_w_y(j,i) = 1.0_wp
	1008	fwym(j,i) = 0.0_wp
	1009	fwyp(j,i) = 1.0_wp
[1]	1010	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1011	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1012	wall_w_y(j,i) = 1.0_wp
	1013	fwym(j,i) = 1.0_wp
	1014	fwyp(j,i) = 0.0_wp
[1]	1015	ENDIF
	1016	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1017	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1018	wall_w_x(j,i) = 1.0_wp
	1019	fwxm(j,i) = 0.0_wp
	1020	fwxp(j,i) = 1.0_wp
[1]	1021	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1022	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1023	wall_w_x(j,i) = 1.0_wp
	1024	fwxm(j,i) = 1.0_wp
	1025	fwxp(j,i) = 0.0_wp
[1]	1026	ENDIF
	1027	!
	1028	!-- Wall and corner locations inside buildings for limitation of
	1029	!-- near-wall mixing length l_wall
	1030	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1031
	1032	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1033
	1034	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1035	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1036	nzb_s_inner(j,i-1) ) + 1
	1037	ENDIF
	1038
	1039	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1040	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1041	nzb_s_inner(j,i+1) ) + 1
	1042	ENDIF
	1043
	1044	ENDIF
	1045
	1046	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1047
	1048	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1049	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1050	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1051	nzb_s_inner(j,i-1) ) + 1
	1052	ENDIF
	1053
	1054	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1055	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1056	nzb_s_inner(j,i+1) ) + 1
	1057	ENDIF
	1058
	1059	ENDIF
	1060
	1061	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1062	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1063	ENDIF
	1064
	1065	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1066	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1067	ENDIF
	1068
	1069	ENDDO
	1070	ENDDO
	1071
	1072	!
[114]	1073	!-- Calculate wall flag arrays for the multigrid method
[1575]	1074	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1075	!
	1076	!-- Gridpoint increment of the current level
	1077	inc = 1
	1078
	1079	DO l = maximum_grid_level, 1 , -1
	1080
	1081	nxl_l = nxl_mg(l)
	1082	nxr_l = nxr_mg(l)
	1083	nys_l = nys_mg(l)
	1084	nyn_l = nyn_mg(l)
	1085	nzt_l = nzt_mg(l)
	1086
	1087	!
	1088	!-- Assign the flag level to be calculated
	1089	SELECT CASE ( l )
	1090	CASE ( 1 )
	1091	flags => wall_flags_1
	1092	CASE ( 2 )
	1093	flags => wall_flags_2
	1094	CASE ( 3 )
	1095	flags => wall_flags_3
	1096	CASE ( 4 )
	1097	flags => wall_flags_4
	1098	CASE ( 5 )
	1099	flags => wall_flags_5
	1100	CASE ( 6 )
	1101	flags => wall_flags_6
	1102	CASE ( 7 )
	1103	flags => wall_flags_7
	1104	CASE ( 8 )
	1105	flags => wall_flags_8
	1106	CASE ( 9 )
	1107	flags => wall_flags_9
	1108	CASE ( 10 )
	1109	flags => wall_flags_10
	1110	END SELECT
	1111
	1112	!
	1113	!-- Depending on the grid level, set the respective bits in case of
	1114	!-- neighbouring walls
	1115	!-- Bit 0: wall to the bottom
	1116	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1117	!-- Bit 2: wall to the south
	1118	!-- Bit 3: wall to the north
	1119	!-- Bit 4: wall to the left
	1120	!-- Bit 5: wall to the right
[116]	1121	!-- Bit 6: inside building
[114]	1122
	1123	flags = 0
	1124
[927]	1125	!
	1126	!-- In case of masking method, flags are not set and multigrid method
	1127	!-- works like FFT-solver
	1128	IF ( .NOT. masking_method ) THEN
	1129
	1130	DO i = nxl_l-1, nxr_l+1
	1131	DO j = nys_l-1, nyn_l+1
	1132	DO k = nzb, nzt_l+1
[114]	1133
	1134	!
[927]	1135	!-- Inside/outside building (inside building does not need
	1136	!-- further tests for walls)
	1137	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1138
[927]	1139	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1140
[927]	1141	ELSE
[114]	1142	!
[927]	1143	!-- Bottom wall
	1144	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1145	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1146	ENDIF
[114]	1147	!
[927]	1148	!-- South wall
	1149	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1150	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1151	ENDIF
[114]	1152	!
[927]	1153	!-- North wall
	1154	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1155	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1156	ENDIF
[114]	1157	!
[927]	1158	!-- Left wall
	1159	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1160	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1161	ENDIF
[114]	1162	!
[927]	1163	!-- Right wall
	1164	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1165	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1166	ENDIF
	1167
[114]	1168	ENDIF
	1169
[927]	1170	ENDDO
[114]	1171	ENDDO
	1172	ENDDO
	1173
[927]	1174	ENDIF
	1175
[114]	1176	!
	1177	!-- Test output of flag arrays
[145]	1178	! i = nxl_l
	1179	! WRITE (9,*) ' '
	1180	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1181	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1182	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1183	! DO k = nzt_l+1, nzb, -1
	1184	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1185	! ENDDO
[114]	1186
	1187	inc = inc * 2
	1188
	1189	ENDDO
	1190
	1191	ENDIF
[861]	1192	!
	1193	!-- Allocate flags needed for masking walls.
[1221]	1194	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr), &
	1195	wall_flags_00(nzb:nzt,nys:nyn,nxl:nxr) )
	1196	wall_flags_0 = 0
	1197	wall_flags_00 = 0
[114]	1198
[1557]	1199	IF ( scalar_advec == 'ws-scheme' .OR. &
	1200	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1201	!
[861]	1202	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1203	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1204	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1205	!-- grid points.
	1206	DO i = nxl, nxr
	1207	DO j = nys, nyn
	1208	DO k = nzb_s_inner(j,i)+1, nzt
	1209	!
	1210	!-- scalar - x-direction
	1211	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1212	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1213	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1214	.AND. i == nxr ) ) THEN
[861]	1215	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1216	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1217	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1218	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1219	) THEN
[861]	1220	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1221	ELSE
	1222	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1223	ENDIF
	1224	!
	1225	!-- scalar - y-direction
	1226	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1227	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1228	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1229	.AND. j == nyn ) ) THEN
[861]	1230	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1231	!-- WS3
	1232	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1233	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1234	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1235	) THEN
[861]	1236	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1237	!-- WS5
	1238	ELSE
	1239	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1240	ENDIF
	1241	!
	1242	!-- scalar - z-direction
	1243	!-- WS1 (6), WS3 (7), WS5 (8)
	1244	flag_set = .FALSE.
	1245	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1246	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1247	flag_set = .TRUE.
	1248	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1249	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1250	flag_set = .TRUE.
	1251	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1252	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1253	ENDIF
	1254	ENDDO
	1255	ENDDO
	1256	ENDDO
	1257	ENDIF
	1258
	1259	IF ( momentum_advec == 'ws-scheme' ) THEN
	1260	!
	1261	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1262	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1263	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1264	!-- grid points.
	1265	DO i = nxl, nxr
	1266	DO j = nys, nyn
[1580]	1267	DO k = nzb+1, nzt
[861]	1268	!
[1580]	1269	!-- At first, set flags to WS1.
	1270	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1271	!-- in order to handle the left/south flux.
	1272	!-- near vertical walls.
	1273	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1274	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1275	!
[861]	1276	!-- u component - x-direction
	1277	!-- WS1 (9), WS3 (10), WS5 (11)
	1278	IF ( k <= nzb_u_inner(j,i+1) &
[1409]	1279	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
[978]	1280	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1281	) THEN
[1580]	1282	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[861]	1283	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1284	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1285	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1286	) THEN
[861]	1287	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1288	!
	1289	!-- Clear flag for WS1
	1290	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1291	ELSE
	1292	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1293	!
	1294	!-- Clear flag for WS1
	1295	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1296	ENDIF
	1297	!
	1298	!-- u component - y-direction
	1299	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1300	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1301	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1302	.AND. j == nyn ) ) THEN
[1580]	1303	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1304	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1305	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1306	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1307	) THEN
[861]	1308	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1309	!
	1310	!-- Clear flag for WS1
	1311	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1312	ELSE
	1313	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1314	!
	1315	!-- Clear flag for WS1
	1316	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1317	ENDIF
	1318	!
	1319	!-- u component - z-direction
	1320	!-- WS1 (15), WS3 (16), WS5 (17)
	1321	flag_set = .FALSE.
	1322	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1323	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1324	flag_set = .TRUE.
	1325	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1326	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1327	flag_set = .TRUE.
	1328	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1329	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1330	ENDIF
	1331
	1332	ENDDO
	1333	ENDDO
	1334	ENDDO
	1335
	1336	DO i = nxl, nxr
	1337	DO j = nys, nyn
[1580]	1338	DO k = nzb+1, nzt
[861]	1339	!
[1580]	1340	!-- At first, set flags to WS1.
	1341	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1342	!-- in order to handle the left/south flux.
	1343	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1344	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1345	!
[861]	1346	!-- v component - x-direction
	1347	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1348	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1349	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1350	.AND. i == nxr ) ) THEN
[1580]	1351	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
[861]	1352	!-- WS3
	1353	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1354	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1355	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1356	) THEN
[861]	1357	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1358	!
	1359	!-- Clear flag for WS1
	1360	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1361	ELSE
	1362	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1363	!
	1364	!-- Clear flag for WS1
	1365	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1366	ENDIF
	1367	!
	1368	!-- v component - y-direction
	1369	!-- WS1 (21), WS3 (22), WS5 (23)
	1370	IF ( k <= nzb_v_inner(j+1,i) &
[1409]	1371	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
[978]	1372	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1373	) THEN
[1580]	1374	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1375	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1376	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1377	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1378	) THEN
[861]	1379	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1380	!
	1381	!-- Clear flag for WS1
	1382	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1383	ELSE
	1384	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1385	!
	1386	!-- Clear flag for WS1
	1387	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1388	ENDIF
	1389	!
	1390	!-- v component - z-direction
	1391	!-- WS1 (24), WS3 (25), WS5 (26)
	1392	flag_set = .FALSE.
	1393	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1394	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1395	flag_set = .TRUE.
	1396	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1397	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1398	flag_set = .TRUE.
	1399	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1400	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1401	ENDIF
	1402
	1403	ENDDO
	1404	ENDDO
	1405	ENDDO
	1406	DO i = nxl, nxr
	1407	DO j = nys, nyn
[1580]	1408	DO k = nzb+1, nzt
[861]	1409	!
[1580]	1410	!-- At first, set flags to WS1.
	1411	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1412	!-- in order to handle the left/south flux.
	1413	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1414	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1415	!
[861]	1416	!-- w component - x-direction
	1417	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1418	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1419	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1420	.AND. i == nxr ) ) THEN
[1580]	1421	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1422	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1423	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1424	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1425	) THEN
[861]	1426	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1427	!
	1428	!-- Clear flag for WS1
	1429	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1430	ELSE
	1431	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1432	!
	1433	!-- Clear flag for WS1
	1434	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1435	ENDIF
	1436	!
	1437	!-- w component - y-direction
	1438	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1439	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1440	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1441	.AND. j == nyn ) ) THEN
[1580]	1442	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1443	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1444	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1445	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1446	) THEN
[861]	1447	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1448	!
	1449	!-- Clear flag for WS1
	1450	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1451	ELSE
[1221]	1452	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1453	!
	1454	!-- Clear flag for WS1
	1455	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1456	ENDIF
	1457	!
	1458	!-- w component - z-direction
	1459	!-- WS1 (33), WS3 (34), WS5 (35)
	1460	flag_set = .FALSE.
	1461	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1462	.OR. k == nzt ) THEN
	1463	!
	1464	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1465	!-- set, although this is not a prognostic level. However,
	1466	!-- contrary to the advection of u,v and s this is necessary
	1467	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1468	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1469	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1470	flag_set = .TRUE.
	1471	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1472	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1473	flag_set = .TRUE.
	1474	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1475	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1476	ENDIF
	1477
	1478	ENDDO
	1479	ENDDO
	1480	ENDDO
	1481
	1482	ENDIF
	1483
	1484	!
[1]	1485	!-- In case of topography: limit near-wall mixing length l_wall further:
	1486	!-- Go through all points of the subdomain one by one and look for the closest
	1487	!-- surface
	1488	IF ( TRIM(topography) /= 'flat' ) THEN
	1489	DO i = nxl, nxr
	1490	DO j = nys, nyn
	1491
	1492	nzb_si = nzb_s_inner(j,i)
	1493	vi = vertical_influence(nzb_si)
	1494
	1495	IF ( wall_n(j,i) > 0 ) THEN
	1496	!
	1497	!-- North wall (y distance)
	1498	DO k = wall_n(j,i), nzb_si
[1353]	1499	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1500	ENDDO
	1501	!
	1502	!-- Above North wall (yz distance)
	1503	DO k = nzb_si + 1, nzb_si + vi
[1353]	1504	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1505	SQRT( 0.25_wp * dy**2 + &
[1]	1506	( zu(k) - zw(nzb_si) )**2 ) )
	1507	ENDDO
	1508	!
	1509	!-- Northleft corner (xy distance)
	1510	IF ( corner_nl(j,i) > 0 ) THEN
	1511	DO k = corner_nl(j,i), nzb_si
	1512	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1513	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1514	ENDDO
	1515	!
	1516	!-- Above Northleft corner (xyz distance)
	1517	DO k = nzb_si + 1, nzb_si + vi
[1353]	1518	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1519	SQRT( 0.25_wp * (dx2 + dy2) + &
	1520	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1521	ENDDO
	1522	ENDIF
	1523	!
	1524	!-- Northright corner (xy distance)
	1525	IF ( corner_nr(j,i) > 0 ) THEN
	1526	DO k = corner_nr(j,i), nzb_si
[1353]	1527	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1528	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1529	ENDDO
	1530	!
	1531	!-- Above northright corner (xyz distance)
	1532	DO k = nzb_si + 1, nzb_si + vi
[1353]	1533	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1534	SQRT( 0.25_wp * (dx2 + dy2) + &
	1535	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1536	ENDDO
	1537	ENDIF
	1538	ENDIF
	1539
	1540	IF ( wall_s(j,i) > 0 ) THEN
	1541	!
	1542	!-- South wall (y distance)
	1543	DO k = wall_s(j,i), nzb_si
[1353]	1544	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1545	ENDDO
	1546	!
	1547	!-- Above south wall (yz distance)
[1353]	1548	DO k = nzb_si + 1, nzb_si + vi
	1549	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1550	SQRT( 0.25_wp * dy**2 + &
[1]	1551	( zu(k) - zw(nzb_si) )**2 ) )
	1552	ENDDO
	1553	!
	1554	!-- Southleft corner (xy distance)
	1555	IF ( corner_sl(j,i) > 0 ) THEN
	1556	DO k = corner_sl(j,i), nzb_si
[1353]	1557	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1558	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1559	ENDDO
	1560	!
	1561	!-- Above southleft corner (xyz distance)
	1562	DO k = nzb_si + 1, nzb_si + vi
[1353]	1563	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1564	SQRT( 0.25_wp * (dx2 + dy2) + &
	1565	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1566	ENDDO
	1567	ENDIF
	1568	!
	1569	!-- Southright corner (xy distance)
	1570	IF ( corner_sr(j,i) > 0 ) THEN
	1571	DO k = corner_sr(j,i), nzb_si
[1353]	1572	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1573	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1574	ENDDO
	1575	!
	1576	!-- Above southright corner (xyz distance)
	1577	DO k = nzb_si + 1, nzb_si + vi
[1353]	1578	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1579	SQRT( 0.25_wp * (dx2 + dy2) + &
	1580	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1581	ENDDO
	1582	ENDIF
	1583
	1584	ENDIF
	1585
	1586	IF ( wall_l(j,i) > 0 ) THEN
	1587	!
	1588	!-- Left wall (x distance)
	1589	DO k = wall_l(j,i), nzb_si
[1353]	1590	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1591	ENDDO
	1592	!
	1593	!-- Above left wall (xz distance)
	1594	DO k = nzb_si + 1, nzb_si + vi
[1353]	1595	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1596	SQRT( 0.25_wp * dx**2 + &
	1597	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1598	ENDDO
	1599	ENDIF
	1600
	1601	IF ( wall_r(j,i) > 0 ) THEN
	1602	!
	1603	!-- Right wall (x distance)
	1604	DO k = wall_r(j,i), nzb_si
[1353]	1605	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1606	ENDDO
	1607	!
	1608	!-- Above right wall (xz distance)
	1609	DO k = nzb_si + 1, nzb_si + vi
[1353]	1610	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1611	SQRT( 0.25_wp * dx**2 + &
[1]	1612	( zu(k) - zw(nzb_si) )**2 ) )
	1613	ENDDO
	1614
	1615	ENDIF
	1616
	1617	ENDDO
	1618	ENDDO
	1619
	1620	ENDIF
	1621
	1622	!
	1623	!-- Multiplication with wall_adjustment_factor
	1624	l_wall = wall_adjustment_factor * l_wall
	1625
	1626	!
[709]	1627	!-- Set lateral boundary conditions for l_wall
[667]	1628	CALL exchange_horiz( l_wall, nbgp )
	1629
[1]	1630	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1631	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1632
[807]	1633	#endif
[1]	1634
	1635	END SUBROUTINE init_grid

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