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source: palm/trunk/SOURCE/init_grid.f90 @ 1679

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

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