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source: palm/trunk/SOURCE/init_grid.f90 @ 1886

Last change on this file since 1886 was 1886, checked in by suehring, 8 years ago
Fixed bugs concerning advection flags, variable descriptions added in declaration block
Property svn:keywords set to `Id`
File size: 75.2 KB

Rev	Line
[1682]	1	!> @file init_grid.f90
[1743]	2	!-------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1818]	16	! Copyright 1997-2016 Leibniz Universitaet Hannover
[1743]	17	!-------------------------------------------------------------------------------!
[1036]	18	!
[254]	19	! Current revisions:
[1]	20	! -----------------
[1886]	21	! Bugfix: setting advection flags near walls
	22	! reformulated index values for nzb_v_inner
	23	! variable discriptions added in declaration block
[1805]	24	!
[1321]	25	! Former revisions:
	26	! -----------------
	27	! $Id: init_grid.f90 1886 2016-04-21 11:20:47Z suehring $
	28	!
[1846]	29	! 1845 2016-04-08 08:29:13Z raasch
	30	! nzb_2d removed
	31	!
[1805]	32	! 1804 2016-04-05 16:30:18Z maronga
	33	! Removed code for parameter file check (__check)
	34	!
[1780]	35	! 1779 2016-03-03 08:01:28Z raasch
	36	! coupling_char is trimmed at every place it occurs, because it can have
	37	! different length now
	38	!
[1763]	39	! 1762 2016-02-25 12:31:13Z hellstea
	40	! Introduction of nested domain feature
	41	!
[1744]	42	! 1743 2016-01-13 10:23:51Z raasch
	43	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	44	! total domain
	45	!
[1692]	46	! 1691 2015-10-26 16:17:44Z maronga
	47	! Renamed prandtl_layer to constant_flux_layer.
	48	!
[1683]	49	! 1682 2015-10-07 23:56:08Z knoop
	50	! Code annotations made doxygen readable
	51	!
[1678]	52	! 1677 2015-10-02 13:25:23Z boeske
	53	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	54	!
[1676]	55	! 1675 2015-10-02 08:28:59Z gronemeier
	56	! Bugfix: Definition of topography grid levels
	57	!
[1662]	58	! 1660 2015-09-21 08:15:16Z gronemeier
	59	! Bugfix: Definition of topography grid levels if vertical grid stretching
	60	! starts below the maximum topography height.
	61	!
[1581]	62	! 1580 2015-04-10 13:43:49Z suehring
	63	! Bugfix: setting flags for 5th order scheme near buildings
	64	!
[1576]	65	! 1575 2015-03-27 09:56:27Z raasch
	66	! adjustments for psolver-queries
	67	!
[1558]	68	! 1557 2015-03-05 16:43:04Z suehring
	69	! Adjustment for monotoinic limiter
	70	!
[1419]	71	! 1418 2014-06-06 13:05:08Z fricke
	72	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	73	! condition and a negative value for dz_stretch_level the condition
	74	! was always true for the whole model domain
	75	!
[1410]	76	! 1409 2014-05-23 12:11:32Z suehring
	77	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	78	! j <= nysv
	79	!
[1354]	80	! 1353 2014-04-08 15:21:23Z heinze
	81	! REAL constants provided with KIND-attribute
	82	!
[1323]	83	! 1322 2014-03-20 16:38:49Z raasch
	84	! REAL constants defined as wp-kind
	85	!
[1321]	86	! 1320 2014-03-20 08:40:49Z raasch
[1320]	87	! ONLY-attribute added to USE-statements,
	88	! kind-parameters added to all INTEGER and REAL declaration statements,
	89	! kinds are defined in new module kinds,
	90	! revision history before 2012 removed,
	91	! comment fields (!:) to be used for variable explanations added to
	92	! all variable declaration statements
[1321]	93	!
[1222]	94	! 1221 2013-09-10 08:59:13Z raasch
	95	! wall_flags_00 introduced to hold bits 32-63,
	96	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	97	! loops optimized for openACC (pres + flow_statistics)
	98	!
[1093]	99	! 1092 2013-02-02 11:24:22Z raasch
	100	! unused variables removed
	101	!
[1070]	102	! 1069 2012-11-28 16:18:43Z maronga
[1779]	103	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	104	! ocean model in case of coupled runs
[1070]	105	!
[1037]	106	! 1036 2012-10-22 13:43:42Z raasch
	107	! code put under GPL (PALM 3.9)
	108	!
[1017]	109	! 1015 2012-09-27 09:23:24Z raasch
	110	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	111	! nzb_w_inner+1
	112	!
[997]	113	! 996 2012-09-07 10:41:47Z raasch
	114	! little reformatting
	115	!
[979]	116	! 978 2012-08-09 08:28:32Z fricke
	117	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	118	! Bugfix: Set wall_flags_0 for inflow boundary
	119	!
[928]	120	! 927 2012-06-06 19:15:04Z raasch
	121	! Wall flags are not set for multigrid method in case of masking method
	122	!
[865]	123	! 864 2012-03-27 15:10:33Z gryschka
[927]	124	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	125	! were not correctly defined for k=1.
[865]	126	!
[863]	127	! 861 2012-03-26 14:18:34Z suehring
[861]	128	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	129	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	130	! model domain.!
[861]	131	! Initialization of nzb_s_inner and nzb_w_inner.
	132	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	133	! while setting wall_flags_0
	134	!
[844]	135	! 843 2012-02-29 15:16:21Z gryschka
	136	! In case of ocean and dirichlet bc for u and v at the bottom
	137	! the first u-level ist defined at same height as the first w-level
	138	!
[819]	139	! 818 2012-02-08 16:11:23Z maronga
	140	! Bugfix: topo_height is only required if topography is used. It is thus now
	141	! allocated in the topography branch
	142	!
[810]	143	! 809 2012-01-30 13:32:58Z maronga
	144	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	145	!
[808]	146	! 807 2012-01-25 11:53:51Z maronga
	147	! New cpp directive "__check" implemented which is used by check_namelist_files
	148	!
[1]	149	! Revision 1.1 1997/08/11 06:17:45 raasch
	150	! Initial revision (Testversion)
	151	!
	152	!
	153	! Description:
	154	! ------------
[1682]	155	!> Creating grid depending constants
[1]	156	!------------------------------------------------------------------------------!
[1682]	157	SUBROUTINE init_grid
	158
[1]	159
[1320]	160	USE arrays_3d, &
	161	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	162	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	163
[1353]	164	USE control_parameters, &
[1320]	165	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	166	building_length_y, building_wall_left, building_wall_south, &
	167	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	168	canyon_width_x, canyon_width_y, constant_flux_layer, &
	169	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	170	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	171	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	172	masking_method, maximum_grid_level, message_string, &
[1762]	173	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	174	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
	175	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	176	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	177	wall_adjustment_factor
[1320]	178
	179	USE grid_variables, &
	180	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	181	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	182	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	183
	184	USE indices, &
	185	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	186	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
[1845]	187	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
	188	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
	189	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
	190	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
[1320]	191	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	192	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	193	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	194	wall_flags_9
	195
	196	USE kinds
	197
[1]	198	USE pegrid
	199
	200	IMPLICIT NONE
	201
[1886]	202	INTEGER(iwp) :: bh !< temporary vertical index of building height
	203	INTEGER(iwp) :: blx !< grid point number of building size along x
	204	INTEGER(iwp) :: bly !< grid point number of building size along y
	205	INTEGER(iwp) :: bxl !< index for left building wall
	206	INTEGER(iwp) :: bxr !< index for right building wall
	207	INTEGER(iwp) :: byn !< index for north building wall
	208	INTEGER(iwp) :: bys !< index for south building wall
	209	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
	210	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
	211	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
	212	INTEGER(iwp) :: cxl !< index for left canyon wall
	213	INTEGER(iwp) :: cxr !< index for right canyon wall
	214	INTEGER(iwp) :: cyn !< index for north canyon wall
	215	INTEGER(iwp) :: cys !< index for south canyon wall
	216	INTEGER(iwp) :: gls !< number of lateral ghost points at total model
	217	!< domain boundaries required for multigrid solver
	218	INTEGER(iwp) :: i !< index variable along x
	219	INTEGER(iwp) :: ii !< loop variable for reading topography file
	220	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
	221	INTEGER(iwp) :: j !< index variable along y
	222	INTEGER(iwp) :: k !< index variable along z
	223	INTEGER(iwp) :: l !< loop variable
	224	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
	225	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
	226	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
	227	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
	228	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
	229	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
	230	INTEGER(iwp) :: vi !< dummy for vertical influence
[1]	231
[1886]	232	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
	233	vertical_influence !< number of vertical grid points above
	234	!< obstacle where adjustment of near-
	235	!< wall mixing length is required
	236
	237	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of
	238	!< north-left corner location to limit
	239	!< near-wall mixing length
	240	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
	241	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
	242	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
	243	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to
	244	!< adjacent left-facing
	245	!< wall
	246	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
	247	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
	248	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
	249	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography
	250	!< top at cell-center
	251	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate
	252	!< topography indices
	253	!< on u- and v-grid
[1]	254
[1886]	255	LOGICAL :: flag_set = .FALSE. !< steering variable for advection flags
[1]	256
[1886]	257	REAL(wp) :: dx_l !< grid spacing along x on different multigrid level
	258	REAL(wp) :: dy_l !< grid spacing along y on different multigrid level
	259	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
[861]	260
[1886]	261	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for
	262	!< topography height
[1]	263
[667]	264
[1]	265	!
[709]	266	!-- Calculation of horizontal array bounds including ghost layers
[667]	267	nxlg = nxl - nbgp
	268	nxrg = nxr + nbgp
	269	nysg = nys - nbgp
	270	nyng = nyn + nbgp
[709]	271
[667]	272	!
[1]	273	!-- Allocate grid arrays
[1353]	274	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	275	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	276
	277	!
	278	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	279	IF ( dz == -1.0_wp ) THEN
[254]	280	message_string = 'missing dz'
	281	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	282	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	283	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	284	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	285	ENDIF
[94]	286
[1]	287	!
[94]	288	!-- Define the vertical grid levels
	289	IF ( .NOT. ocean ) THEN
	290	!
	291	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	292	!-- The second u-level (k=1) corresponds to the top of the
[94]	293	!-- Prandtl-layer.
[667]	294
	295	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	296	zu(0) = 0.0_wp
	297	! zu(0) = - dz * 0.5_wp
[667]	298	ELSE
[1353]	299	zu(0) = - dz * 0.5_wp
[667]	300	ENDIF
[1353]	301	zu(1) = dz * 0.5_wp
[1]	302
[94]	303	dz_stretch_level_index = nzt+1
	304	dz_stretched = dz
	305	DO k = 2, nzt+1
	306	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	307	dz_stretched = dz_stretched * dz_stretch_factor
	308	dz_stretched = MIN( dz_stretched, dz_max )
	309	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	310	ENDIF
	311	zu(k) = zu(k-1) + dz_stretched
	312	ENDDO
[1]	313
	314	!
[94]	315	!-- Compute the w-levels. They are always staggered half-way between the
[843]	316	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	317	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	318	!-- The top w-level is extrapolated linearly.
[1353]	319	zw(0) = 0.0_wp
[94]	320	DO k = 1, nzt
[1353]	321	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	322	ENDDO
[1353]	323	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	324
[94]	325	ELSE
[1]	326	!
[843]	327	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	328	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	329	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	330	!-- w-level are defined at same height, but staggered from the second level.
	331	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	332	zu(nzt+1) = dz * 0.5_wp
	333	zu(nzt) = - dz * 0.5_wp
[94]	334
	335	dz_stretch_level_index = 0
	336	dz_stretched = dz
	337	DO k = nzt-1, 0, -1
[1418]	338	!
	339	!-- The default value of dz_stretch_level is positive, thus the first
	340	!-- condition is always true. Hence, the second condition is necessary.
	341	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	342	.AND. dz_stretched < dz_max ) THEN
[94]	343	dz_stretched = dz_stretched * dz_stretch_factor
	344	dz_stretched = MIN( dz_stretched, dz_max )
	345	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	346	ENDIF
	347	zu(k) = zu(k+1) - dz_stretched
	348	ENDDO
	349
	350	!
	351	!-- Compute the w-levels. They are always staggered half-way between the
[843]	352	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	353	!-- at the ground. In this case the first u- and w-level are defined at
	354	!-- same height. The top w-level (nzt+1) is not used but set for
	355	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	356	zw(nzt+1) = dz
[1353]	357	zw(nzt) = 0.0_wp
[94]	358	DO k = 0, nzt
[1353]	359	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	360	ENDDO
	361
[843]	362	!
	363	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	364	!-- at same height.
	365	IF ( ibc_uv_b == 0 ) THEN
	366	zu(0) = zw(0)
	367	ENDIF
	368
[94]	369	ENDIF
	370
	371	!
[1]	372	!-- Compute grid lengths.
	373	DO k = 1, nzt+1
	374	dzu(k) = zu(k) - zu(k-1)
[1353]	375	ddzu(k) = 1.0_wp / dzu(k)
[1]	376	dzw(k) = zw(k) - zw(k-1)
[1353]	377	ddzw(k) = 1.0_wp / dzw(k)
[1]	378	ENDDO
	379
	380	DO k = 1, nzt
[1353]	381	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	382	ENDDO
[667]	383
	384	!
[709]	385	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	386	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	387	!-- is only dz/2, but should be dz. Therefore, an additional array
	388	!-- containing with appropriate grid information is created for these
	389	!-- solvers.
[1575]	390	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	391	ALLOCATE( ddzu_pres(1:nzt+1) )
	392	ddzu_pres = ddzu
[864]	393	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	394	ENDIF
[1]	395
	396	!
	397	!-- In case of multigrid method, compute grid lengths and grid factors for the
	398	!-- grid levels
[1575]	399	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	400
	401	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	402	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	403	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	404	f1_mg(nzb+1:nzt,maximum_grid_level), &
	405	f2_mg(nzb+1:nzt,maximum_grid_level), &
	406	f3_mg(nzb+1:nzt,maximum_grid_level) )
	407
	408	dzu_mg(:,maximum_grid_level) = dzu
[667]	409	!
[864]	410	!-- Next line to ensure an equally spaced grid.
	411	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	412
[1]	413	dzw_mg(:,maximum_grid_level) = dzw
	414	nzt_l = nzt
	415	DO l = maximum_grid_level-1, 1, -1
[1353]	416	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	417	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	418	nzt_l = nzt_l / 2
	419	DO k = 2, nzt_l+1
	420	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	421	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	422	ENDDO
	423	ENDDO
	424
	425	nzt_l = nzt
	426	dx_l = dx
	427	dy_l = dy
	428	DO l = maximum_grid_level, 1, -1
[1353]	429	ddx2_mg(l) = 1.0_wp / dx_l**2
	430	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	431	DO k = nzb+1, nzt_l
[1353]	432	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	433	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	434	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	435	f2_mg(k,l) + f3_mg(k,l)
	436	ENDDO
	437	nzt_l = nzt_l / 2
[1353]	438	dx_l = dx_l * 2.0_wp
	439	dy_l = dy_l * 2.0_wp
[1]	440	ENDDO
	441
	442	ENDIF
	443
	444	!
	445	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	446	ddx = 1.0_wp / dx
	447	ddy = 1.0_wp / dy
[1]	448	dx2 = dx * dx
	449	dy2 = dy * dy
[1353]	450	ddx2 = 1.0_wp / dx2
	451	ddy2 = 1.0_wp / dy2
[1]	452
	453	!
	454	!-- Compute the grid-dependent mixing length.
	455	DO k = 1, nzt
[1322]	456	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	457	ENDDO
	458
	459	!
	460	!-- Allocate outer and inner index arrays for topography and set
[114]	461	!-- defaults.
	462	!-- nzb_local has to contain additional layers of ghost points for calculating
	463	!-- the flag arrays needed for the multigrid method
	464	gls = 2**( maximum_grid_level )
[861]	465	IF ( gls < nbgp ) gls = nbgp
[667]	466
[114]	467	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	468	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	469	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	470	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	471	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	472	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	473	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	474	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	475	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	476	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	477	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	478	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	479	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	480	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	481	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	482	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	483	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	484	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	485	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	486	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	487	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	488	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
[1221]	489	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	490	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	491	wall_e_x(nysg:nyng,nxlg:nxrg), &
	492	wall_e_y(nysg:nyng,nxlg:nxrg), &
	493	wall_u(nysg:nyng,nxlg:nxrg), &
	494	wall_v(nysg:nyng,nxlg:nxrg), &
	495	wall_w_x(nysg:nyng,nxlg:nxrg), &
	496	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	497
	498
[667]	499
	500	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	501
[818]	502
[1]	503	nzb_s_inner = nzb; nzb_s_outer = nzb
	504	nzb_u_inner = nzb; nzb_u_outer = nzb
	505	nzb_v_inner = nzb; nzb_v_outer = nzb
	506	nzb_w_inner = nzb; nzb_w_outer = nzb
	507
[1353]	508	rflags_s_inner = 1.0_wp
	509	rflags_invers = 1.0_wp
[1221]	510
[1]	511	!
[19]	512	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	513	!-- form (which does not use surface fluxes) is applied
[1691]	514	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	515	nzb_diff = nzb + 2
	516	ELSE
	517	nzb_diff = nzb + 1
	518	ENDIF
[19]	519	IF ( use_top_fluxes ) THEN
	520	nzt_diff = nzt - 1
	521	ELSE
	522	nzt_diff = nzt
	523	ENDIF
[1]	524
	525	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	526	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	527
[1353]	528	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	529	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	530	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	531	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	532
	533	!
	534	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	535	!-- for the moment,
	536	!-- multiplication with wall_adjustment_factor near the end of this routine
	537	l_wall(nzb,:,:) = l_grid(1)
	538	DO k = nzb+1, nzt
	539	l_wall(k,:,:) = l_grid(k)
	540	ENDDO
	541	l_wall(nzt+1,:,:) = l_grid(nzt)
	542
	543	ALLOCATE ( vertical_influence(nzb:nzt) )
	544	DO k = 1, nzt
	545	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	546	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	547	ENDDO
	548
	549	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	550	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	551	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	552	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	553	'threshold given by only local', &
	554	' &horizontal reduction of near_wall ', &
	555	'mixing length l_wall', &
	556	' &starting from height level k = ', k, '.'
	557	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	558	EXIT
	559	ENDIF
	560	ENDDO
	561	vertical_influence(0) = vertical_influence(1)
	562
[667]	563	DO i = nxlg, nxrg
	564	DO j = nysg, nyng
[1]	565	DO k = nzb_s_inner(j,i) + 1, &
	566	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	567	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	568	ENDDO
	569	ENDDO
	570	ENDDO
	571
	572	!
	573	!-- Set outer and inner index arrays for non-flat topography.
	574	!-- Here consistency checks concerning domain size and periodicity are
	575	!-- necessary.
	576	!-- Within this SELECT CASE structure only nzb_local is initialized
	577	!-- individually depending on the chosen topography type, all other index
	578	!-- arrays are initialized further below.
	579	SELECT CASE ( TRIM( topography ) )
	580
	581	CASE ( 'flat' )
	582	!
[555]	583	!-- nzb_local is required for the multigrid solver
	584	nzb_local = 0
[1]	585
	586	CASE ( 'single_building' )
	587	!
	588	!-- Single rectangular building, by default centered in the middle of the
	589	!-- total domain
	590	blx = NINT( building_length_x / dx )
	591	bly = NINT( building_length_y / dy )
[1675]	592	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	593	IF ( ABS( zw(bh ) - building_height ) == &
	594	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	595
[1322]	596	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	597	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	598	ENDIF
	599	bxl = NINT( building_wall_left / dx )
	600	bxr = bxl + blx
	601
[1322]	602	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	603	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	604	ENDIF
	605	bys = NINT( building_wall_south / dy )
	606	byn = bys + bly
	607
	608	!
	609	!-- Building size has to meet some requirements
	610	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	611	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	612	WRITE( message_string, * ) 'inconsistent building parameters:', &
	613	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	614	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	615	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	616	ENDIF
	617
	618	!
[217]	619	!-- Define the building.
[1]	620	nzb_local = 0
[134]	621	nzb_local(bys:byn,bxl:bxr) = bh
[1]	622
[240]	623	CASE ( 'single_street_canyon' )
	624	!
	625	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	626	!-- The canyon is centered in the other direction by default.
[1322]	627	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	628	!
	629	!-- Street canyon in y direction
	630	cwx = NINT( canyon_width_x / dx )
[1322]	631	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	632	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	633	ENDIF
	634	cxl = NINT( canyon_wall_left / dx )
	635	cxr = cxl + cwx
	636
[1322]	637	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	638	!
	639	!-- Street canyon in x direction
	640	cwy = NINT( canyon_width_y / dy )
[1322]	641	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	642	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	643	ENDIF
	644	cys = NINT( canyon_wall_south / dy )
	645	cyn = cys + cwy
	646
	647	ELSE
[254]	648
	649	message_string = 'no street canyon width given'
	650	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	651
[240]	652	ENDIF
	653
[1675]	654	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	655	IF ( ABS( zw(ch ) - canyon_height ) == &
	656	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	657
[240]	658	dp_level_ind_b = ch
	659	!
	660	!-- Street canyon size has to meet some requirements
[1322]	661	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	662	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	663	( ch < 3 ) ) THEN
[1353]	664	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	665	'&cxl=', cxl, 'cxr=', cxr, &
	666	'cwx=', cwx, &
[254]	667	'ch=', ch, 'nx=', nx, 'ny=', ny
	668	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	669	ENDIF
[1322]	670	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	671	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	672	( ch < 3 ) ) THEN
[1353]	673	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	674	'&cys=', cys, 'cyn=', cyn, &
	675	'cwy=', cwy, &
[254]	676	'ch=', ch, 'nx=', nx, 'ny=', ny
	677	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	678	ENDIF
	679	ENDIF
[1353]	680	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	681	canyon_width_y /= 9999999.9_wp ) THEN
	682	message_string = 'inconsistent canyon parameters:' // &
	683	'&street canyon can only be oriented' // &
[254]	684	'&either in x- or in y-direction'
	685	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	686	ENDIF
	687
	688	nzb_local = ch
[1322]	689	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	690	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	691	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	692	nzb_local(cys+1:cyn-1,:) = 0
	693	ENDIF
	694
[1]	695	CASE ( 'read_from_file' )
[759]	696
[818]	697	ALLOCATE ( topo_height(0:ny,0:nx) )
	698
[759]	699	DO ii = 0, io_blocks-1
	700	IF ( ii == io_group ) THEN
	701
[1]	702	!
[759]	703	!-- Arbitrary irregular topography data in PALM format (exactly
	704	!-- matching the grid size and total domain size)
[1779]	705	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	706	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[759]	707	DO j = ny, 0, -1
	708	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	709	ENDDO
	710
	711	GOTO 12
	712
[1779]	713	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	714	' does not exist'
[759]	715	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	716
[1779]	717	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	718	TRIM( coupling_char )
[759]	719	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	720
	721	12 CLOSE( 90 )
	722
	723	ENDIF
[1804]	724	#if defined( __parallel )
[759]	725	CALL MPI_BARRIER( comm2d, ierr )
	726	#endif
[559]	727	ENDDO
[759]	728
[1]	729	!
	730	!-- Calculate the index height of the topography
	731	DO i = 0, nx
	732	DO j = 0, ny
[1675]	733	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	734	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	735	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	736	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	737	ENDDO
	738	ENDDO
[818]	739
	740	DEALLOCATE ( topo_height )
[114]	741	!
[759]	742	!-- Add cyclic boundaries (additional layers are for calculating
	743	!-- flag arrays needed for the multigrid sover)
[114]	744	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	745	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	746	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	747	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	748
[1]	749	CASE DEFAULT
	750	!
	751	!-- The DEFAULT case is reached either if the parameter topography
[217]	752	!-- contains a wrong character string or if the user has defined a special
[1]	753	!-- case in the user interface. There, the subroutine user_init_grid
	754	!-- checks which of these two conditions applies.
[114]	755	CALL user_init_grid( gls, nzb_local )
[1]	756
	757	END SELECT
	758	!
[861]	759	!-- Determine the maximum level of topography. Furthermore it is used for
	760	!-- steering the degradation of order of the applied advection scheme.
[978]	761	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	762	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	763	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	764	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	765	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	766	nest_domain ) &
	767	THEN
	768	nzb_max = nzt
[978]	769	ENDIF
	770
[861]	771	!
[1]	772	!-- Consistency checks and index array initialization are only required for
[217]	773	!-- non-flat topography, also the initialization of topography height arrays
[49]	774	!-- zu_s_inner and zw_w_inner
[1]	775	IF ( TRIM( topography ) /= 'flat' ) THEN
	776
	777	!
	778	!-- Consistency checks
	779	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	780	WRITE( message_string, * ) 'nzb_local values are outside the', &
	781	'model domain', &
	782	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	783	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	784	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	785	ENDIF
	786
[722]	787	IF ( bc_lr == 'cyclic' ) THEN
[1353]	788	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	789	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	790	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	791	' boundary condition in x-direction'
	792	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	793	ENDIF
	794	ENDIF
[722]	795	IF ( bc_ns == 'cyclic' ) THEN
[1353]	796	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	797	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	798	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	799	' boundary condition in y-direction'
	800	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	801	ENDIF
	802	ENDIF
	803
[217]	804	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	805	!
[217]	806	!-- The array nzb_local as defined using the 'cell_edge' convention
	807	!-- describes the actual total size of topography which is defined at the
	808	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	809	!-- on the topography walls in y-direction. However, PALM uses individual
	810	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	811	!-- Therefore, the extent of topography in nzb_local is now reduced by
	812	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	813	!-- to form the basis for nzb_s_inner.
	814	DO j = -gls, ny + gls
	815	DO i = -gls, nx
	816	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	817	ENDDO
[134]	818	ENDDO
[217]	819	!-- apply cyclic boundary conditions in x-direction
	820	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	821	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	822	DO i = -gls, nx + gls
	823	DO j = -gls, ny
	824	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	825	ENDDO
[134]	826	ENDDO
[217]	827	!-- apply cyclic boundary conditions in y-direction
	828	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	829	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	830	ENDIF
[134]	831
[1]	832	!
	833	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	834	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	835	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	836
	837	!
	838	!-- Initialize remaining index arrays:
	839	!-- first pre-initialize them with nzb_s_inner...
	840	nzb_u_inner = nzb_s_inner
	841	nzb_u_outer = nzb_s_inner
	842	nzb_v_inner = nzb_s_inner
	843	nzb_v_outer = nzb_s_inner
	844	nzb_w_outer = nzb_s_inner
	845	nzb_s_outer = nzb_s_inner
	846
	847	!
	848	!-- ...then extend pre-initialized arrays in their according directions
	849	!-- based on nzb_local using nzb_tmp as a temporary global index array
	850
	851	!
	852	!-- nzb_s_outer:
	853	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	854	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	855	DO j = -1, ny + 1
	856	DO i = 0, nx
[1353]	857	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	858	nzb_local(j,i+1) )
	859	ENDDO
	860	ENDDO
	861	DO i = nxl, nxr
	862	DO j = nys, nyn
[1353]	863	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	864	nzb_tmp(j+1,i) )
	865	ENDDO
	866	!
	867	!-- non-cyclic boundary conditions (overwritten by call of
	868	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	869	IF ( nys == 0 ) THEN
	870	j = -1
	871	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	872	ENDIF
[1743]	873	IF ( nyn == ny ) THEN
[1]	874	j = ny + 1
	875	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	876	ENDIF
	877	ENDDO
	878	!
	879	!-- nzb_w_outer:
	880	!-- identical to nzb_s_outer
	881	nzb_w_outer = nzb_s_outer
	882
	883	!
	884	!-- nzb_u_inner:
	885	!-- extend nzb_local rightwards only
[667]	886	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	887	DO j = -1, ny + 1
	888	DO i = 0, nx + 1
	889	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	890	ENDDO
	891	ENDDO
[667]	892	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	893
	894	!
	895	!-- nzb_u_outer:
	896	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	897	DO i = nxl, nxr
	898	DO j = nys, nyn
[1353]	899	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	900	nzb_tmp(j+1,i) )
	901	ENDDO
	902	!
	903	!-- non-cyclic boundary conditions (overwritten by call of
	904	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	905	IF ( nys == 0 ) THEN
	906	j = -1
	907	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	908	ENDIF
[1743]	909	IF ( nyn == ny ) THEN
[1]	910	j = ny + 1
	911	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	912	ENDIF
	913	ENDDO
	914
	915	!
	916	!-- nzb_v_inner:
	917	!-- extend nzb_local northwards only
[667]	918	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	919	DO i = -1, nx + 1
	920	DO j = 0, ny + 1
	921	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	922	ENDDO
	923	ENDDO
[1886]	924	nzb_v_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	925
	926	!
	927	!-- nzb_v_outer:
	928	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	929	DO j = nys, nyn
	930	DO i = nxl, nxr
[1353]	931	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	932	nzb_tmp(j,i+1) )
	933	ENDDO
	934	!
	935	!-- non-cyclic boundary conditions (overwritten by call of
	936	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	937	IF ( nxl == 0 ) THEN
	938	i = -1
	939	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	940	ENDIF
	941	IF ( nxr == nx ) THEN
	942	i = nx + 1
	943	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	944	ENDIF
	945	ENDDO
[1804]	946
[1]	947	!
	948	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	949	!-- boundary conditions, if applicable.
	950	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	951	!-- they do not require exchange and are not included here.
	952	CALL exchange_horiz_2d_int( nzb_u_inner )
	953	CALL exchange_horiz_2d_int( nzb_u_outer )
	954	CALL exchange_horiz_2d_int( nzb_v_inner )
	955	CALL exchange_horiz_2d_int( nzb_v_outer )
	956	CALL exchange_horiz_2d_int( nzb_w_outer )
	957	CALL exchange_horiz_2d_int( nzb_s_outer )
	958
[49]	959	!
	960	!-- Allocate and set the arrays containing the topography height
	961	IF ( myid == 0 ) THEN
	962
	963	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	964
	965	DO i = 0, nx + 1
	966	DO j = 0, ny + 1
	967	zu_s_inner(i,j) = zu(nzb_local(j,i))
	968	zw_w_inner(i,j) = zw(nzb_local(j,i))
	969	ENDDO
	970	ENDDO
	971
	972	ENDIF
[1221]	973	!
	974	!-- Set flag arrays to be used for masking of grid points
	975	DO i = nxlg, nxrg
	976	DO j = nysg, nyng
	977	DO k = nzb, nzt+1
[1353]	978	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	979	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	980	ENDDO
	981	ENDDO
	982	ENDDO
[1804]	983
[1]	984	ENDIF
	985
	986	!
	987	!-- Set the individual index arrays which define the k index from which on
	988	!-- the usual finite difference form (which does not use surface fluxes) is
	989	!-- applied
[1691]	990	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	991	nzb_diff_u = nzb_u_inner + 2
	992	nzb_diff_v = nzb_v_inner + 2
	993	nzb_diff_s_inner = nzb_s_inner + 2
	994	nzb_diff_s_outer = nzb_s_outer + 2
	995	ELSE
	996	nzb_diff_u = nzb_u_inner + 1
	997	nzb_diff_v = nzb_v_inner + 1
	998	nzb_diff_s_inner = nzb_s_inner + 1
	999	nzb_diff_s_outer = nzb_s_outer + 1
	1000	ENDIF
	1001
	1002	!
	1003	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	1004	!-- for limitation of near-wall mixing length l_wall further below
	1005	corner_nl = 0
	1006	corner_nr = 0
	1007	corner_sl = 0
	1008	corner_sr = 0
	1009	wall_l = 0
	1010	wall_n = 0
	1011	wall_r = 0
	1012	wall_s = 0
	1013
	1014	DO i = nxl, nxr
	1015	DO j = nys, nyn
	1016	!
	1017	!-- u-component
	1018	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1019	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1020	fym(j,i) = 0.0_wp
	1021	fyp(j,i) = 1.0_wp
[1]	1022	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1023	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1024	fym(j,i) = 1.0_wp
	1025	fyp(j,i) = 0.0_wp
[1]	1026	ENDIF
	1027	!
	1028	!-- v-component
	1029	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1030	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1031	fxm(j,i) = 0.0_wp
	1032	fxp(j,i) = 1.0_wp
[1]	1033	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1034	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1035	fxm(j,i) = 1.0_wp
	1036	fxp(j,i) = 0.0_wp
[1]	1037	ENDIF
	1038	!
	1039	!-- w-component, also used for scalars, separate arrays for shear
	1040	!-- production of tke
	1041	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1042	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1043	wall_w_y(j,i) = 1.0_wp
	1044	fwym(j,i) = 0.0_wp
	1045	fwyp(j,i) = 1.0_wp
[1]	1046	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1047	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1048	wall_w_y(j,i) = 1.0_wp
	1049	fwym(j,i) = 1.0_wp
	1050	fwyp(j,i) = 0.0_wp
[1]	1051	ENDIF
	1052	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1053	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1054	wall_w_x(j,i) = 1.0_wp
	1055	fwxm(j,i) = 0.0_wp
	1056	fwxp(j,i) = 1.0_wp
[1]	1057	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1058	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1059	wall_w_x(j,i) = 1.0_wp
	1060	fwxm(j,i) = 1.0_wp
	1061	fwxp(j,i) = 0.0_wp
[1]	1062	ENDIF
	1063	!
	1064	!-- Wall and corner locations inside buildings for limitation of
	1065	!-- near-wall mixing length l_wall
	1066	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1067
	1068	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1069
	1070	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1071	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1072	nzb_s_inner(j,i-1) ) + 1
	1073	ENDIF
	1074
	1075	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1076	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1077	nzb_s_inner(j,i+1) ) + 1
	1078	ENDIF
	1079
	1080	ENDIF
	1081
	1082	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1083
	1084	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1085	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1086	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1087	nzb_s_inner(j,i-1) ) + 1
	1088	ENDIF
	1089
	1090	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1091	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1092	nzb_s_inner(j,i+1) ) + 1
	1093	ENDIF
	1094
	1095	ENDIF
	1096
	1097	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1098	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1099	ENDIF
	1100
	1101	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1102	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1103	ENDIF
	1104
	1105	ENDDO
	1106	ENDDO
	1107
	1108	!
[114]	1109	!-- Calculate wall flag arrays for the multigrid method
[1575]	1110	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1111	!
	1112	!-- Gridpoint increment of the current level
	1113	inc = 1
	1114
	1115	DO l = maximum_grid_level, 1 , -1
	1116
	1117	nxl_l = nxl_mg(l)
	1118	nxr_l = nxr_mg(l)
	1119	nys_l = nys_mg(l)
	1120	nyn_l = nyn_mg(l)
	1121	nzt_l = nzt_mg(l)
	1122
	1123	!
	1124	!-- Assign the flag level to be calculated
	1125	SELECT CASE ( l )
	1126	CASE ( 1 )
	1127	flags => wall_flags_1
	1128	CASE ( 2 )
	1129	flags => wall_flags_2
	1130	CASE ( 3 )
	1131	flags => wall_flags_3
	1132	CASE ( 4 )
	1133	flags => wall_flags_4
	1134	CASE ( 5 )
	1135	flags => wall_flags_5
	1136	CASE ( 6 )
	1137	flags => wall_flags_6
	1138	CASE ( 7 )
	1139	flags => wall_flags_7
	1140	CASE ( 8 )
	1141	flags => wall_flags_8
	1142	CASE ( 9 )
	1143	flags => wall_flags_9
	1144	CASE ( 10 )
	1145	flags => wall_flags_10
	1146	END SELECT
	1147
	1148	!
	1149	!-- Depending on the grid level, set the respective bits in case of
	1150	!-- neighbouring walls
	1151	!-- Bit 0: wall to the bottom
	1152	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1153	!-- Bit 2: wall to the south
	1154	!-- Bit 3: wall to the north
	1155	!-- Bit 4: wall to the left
	1156	!-- Bit 5: wall to the right
[116]	1157	!-- Bit 6: inside building
[114]	1158
	1159	flags = 0
	1160
[927]	1161	!
	1162	!-- In case of masking method, flags are not set and multigrid method
	1163	!-- works like FFT-solver
	1164	IF ( .NOT. masking_method ) THEN
	1165
	1166	DO i = nxl_l-1, nxr_l+1
	1167	DO j = nys_l-1, nyn_l+1
	1168	DO k = nzb, nzt_l+1
[114]	1169
	1170	!
[927]	1171	!-- Inside/outside building (inside building does not need
	1172	!-- further tests for walls)
	1173	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1174
[927]	1175	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1176
[927]	1177	ELSE
[114]	1178	!
[927]	1179	!-- Bottom wall
	1180	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1181	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1182	ENDIF
[114]	1183	!
[927]	1184	!-- South wall
	1185	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1186	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1187	ENDIF
[114]	1188	!
[927]	1189	!-- North wall
	1190	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1191	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1192	ENDIF
[114]	1193	!
[927]	1194	!-- Left wall
	1195	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1196	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1197	ENDIF
[114]	1198	!
[927]	1199	!-- Right wall
	1200	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1201	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1202	ENDIF
	1203
[114]	1204	ENDIF
	1205
[927]	1206	ENDDO
[114]	1207	ENDDO
	1208	ENDDO
	1209
[927]	1210	ENDIF
	1211
[114]	1212	!
	1213	!-- Test output of flag arrays
[145]	1214	! i = nxl_l
	1215	! WRITE (9,*) ' '
	1216	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1217	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1218	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1219	! DO k = nzt_l+1, nzb, -1
	1220	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1221	! ENDDO
[114]	1222
	1223	inc = inc * 2
	1224
	1225	ENDDO
	1226
	1227	ENDIF
[861]	1228	!
	1229	!-- Allocate flags needed for masking walls.
[1677]	1230	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1231	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1232	wall_flags_0 = 0
	1233	wall_flags_00 = 0
[114]	1234
[1886]	1235	IF ( scalar_advec == 'ws-scheme' .OR. &
[1557]	1236	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1237	!
[861]	1238	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1239	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1240	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1241	!-- grid points.
	1242	DO i = nxl, nxr
	1243	DO j = nys, nyn
	1244	DO k = nzb_s_inner(j,i)+1, nzt
	1245	!
	1246	!-- scalar - x-direction
	1247	!-- WS1 (0), WS3 (1), WS5 (2)
[1886]	1248	IF ( ( k <= nzb_s_inner(j,i+1) .OR. k <= nzb_s_inner(j,i+2) &
	1249	.OR. k <= nzb_s_inner(j,i-1) ) &
	1250	.OR. ( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
[1762]	1251	.AND. i == nxl ) .OR. &
	1252	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1253	.AND. i == nxr ) ) &
	1254	THEN
[861]	1255	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
[1886]	1256	ELSEIF ( ( k <= nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i+1)&
	1257	.AND. k > nzb_s_inner(j,i+2)&
	1258	.AND. k > nzb_s_inner(j,i-1)&
	1259	) .OR. &
	1260	( k <= nzb_s_inner(j,i-2) .AND. k > nzb_s_inner(j,i+1)&
	1261	.AND. k > nzb_s_inner(j,i+2)&
	1262	.AND. k > nzb_s_inner(j,i-1)&
	1263	) &
[1762]	1264	.OR. &
	1265	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1266	.AND. i == nxr-1 ) .OR. &
	1267	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1268	.AND. i == nxlu ) ) &
	1269	THEN
[861]	1270	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
[1886]	1271	ELSEIF ( k > nzb_s_inner(j,i+1) .AND. k > nzb_s_inner(j,i+2) &
	1272	.AND. k > nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i-1) &
	1273	.AND. k > nzb_s_inner(j,i-2) ) &
	1274	THEN
[861]	1275	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1276	ENDIF
	1277	!
	1278	!-- scalar - y-direction
	1279	!-- WS1 (3), WS3 (4), WS5 (5)
[1886]	1280	IF ( ( k <= nzb_s_inner(j+1,i) .OR. k <= nzb_s_inner(j+2,i) &
	1281	.OR. k <= nzb_s_inner(j-1,i) ) &
	1282	.OR. &
[1762]	1283	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1284	.AND. j == nys ) .OR. &
	1285	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1286	.AND. j == nyn ) ) &
	1287	THEN
[861]	1288	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
[1762]	1289	!
[861]	1290	!-- WS3
[1886]	1291	ELSEIF ( ( k <= nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j+1,i)&
	1292	.AND. k > nzb_s_inner(j+2,i)&
	1293	.AND. k > nzb_s_inner(j-1,i)&
	1294	) .OR. &
	1295	( k <= nzb_s_inner(j-2,i) .AND. k > nzb_s_inner(j+1,i)&
	1296	.AND. k > nzb_s_inner(j+2,i)&
	1297	.AND. k > nzb_s_inner(j-1,i)&
	1298	) &
	1299	.OR. &
[1762]	1300	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1301	.AND. j == nysv ) .OR. &
	1302	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1303	.AND. j == nyn-1 ) ) &
	1304	THEN
[861]	1305	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
[1762]	1306	!
[861]	1307	!-- WS5
[1886]	1308	ELSEIF ( k > nzb_s_inner(j+1,i) .AND. k > nzb_s_inner(j+2,i) &
	1309	.AND. k > nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j-1,i) &
	1310	.AND. k > nzb_s_inner(j-2,i) ) &
	1311	THEN
[861]	1312	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1313	ENDIF
	1314	!
	1315	!-- scalar - z-direction
	1316	!-- WS1 (6), WS3 (7), WS5 (8)
	1317	flag_set = .FALSE.
	1318	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1319	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1320	flag_set = .TRUE.
	1321	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1322	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1323	flag_set = .TRUE.
	1324	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1325	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1326	ENDIF
[1886]	1327
[861]	1328	ENDDO
	1329	ENDDO
	1330	ENDDO
	1331	ENDIF
	1332
	1333	IF ( momentum_advec == 'ws-scheme' ) THEN
	1334	!
	1335	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1336	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1337	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1338	!-- grid points.
	1339	DO i = nxl, nxr
	1340	DO j = nys, nyn
[1580]	1341	DO k = nzb+1, nzt
[861]	1342	!
[1580]	1343	!-- At first, set flags to WS1.
	1344	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1345	!-- in order to handle the left/south flux.
	1346	!-- near vertical walls.
	1347	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1348	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1349	!
[861]	1350	!-- u component - x-direction
	1351	!-- WS1 (9), WS3 (10), WS5 (11)
[1886]	1352	IF ( k <= nzb_u_inner(j,i+1) .OR. &
[1762]	1353	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1354	.AND. i <= nxlu ) .OR. &
	1355	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1356	.AND. i == nxr ) ) &
	1357	THEN
[1580]	1358	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[1886]	1359	ELSEIF ( ( k <= nzb_u_inner(j,i+2) .AND. &
	1360	k > nzb_u_inner(j,i+1) ) .OR. &
	1361	k <= nzb_u_inner(j,i-1) &
	1362	.OR. &
[1762]	1363	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1364	.AND. i == nxr-1 ) .OR. &
	1365	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1366	.AND. i == nxlu+1) ) &
	1367	THEN
[861]	1368	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1369	!
	1370	!-- Clear flag for WS1
	1371	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[1886]	1372	ELSEIF ( k > nzb_u_inner(j,i+1) .AND. k > nzb_u_inner(j,i+2) &
	1373	.AND. k > nzb_u_inner(j,i-1) ) &
	1374	THEN
[861]	1375	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1376	!
	1377	!-- Clear flag for WS1
	1378	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1379	ENDIF
	1380	!
	1381	!-- u component - y-direction
	1382	!-- WS1 (12), WS3 (13), WS5 (14)
[1762]	1383	IF ( k <= nzb_u_inner(j+1,i) .OR. &
	1384	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1385	.AND. j == nys ) .OR. &
	1386	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1387	.AND. j == nyn ) ) &
	1388	THEN
	1389	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[1886]	1390	ELSEIF ( ( k <= nzb_u_inner(j+2,i) .AND. &
	1391	k > nzb_u_inner(j+1,i) ) .OR. &
	1392	k <= nzb_u_inner(j-1,i) &
	1393	.OR. &
[1762]	1394	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1395	.AND. j == nysv ) .OR. &
	1396	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1397	.AND. j == nyn-1 ) ) &
	1398	THEN
[861]	1399	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1400	!
	1401	!-- Clear flag for WS1
	1402	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[1886]	1403	ELSEIF ( k > nzb_u_inner(j+1,i) .AND. k > nzb_u_inner(j+2,i) &
	1404	.AND. k > nzb_u_inner(j-1,i) ) &
	1405	THEN
[861]	1406	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1407	!
	1408	!-- Clear flag for WS1
	1409	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1410	ENDIF
	1411	!
	1412	!-- u component - z-direction
	1413	!-- WS1 (15), WS3 (16), WS5 (17)
	1414	flag_set = .FALSE.
	1415	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1416	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1417	flag_set = .TRUE.
	1418	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1419	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1420	flag_set = .TRUE.
	1421	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1422	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1423	ENDIF
	1424
	1425	ENDDO
	1426	ENDDO
	1427	ENDDO
	1428
	1429	DO i = nxl, nxr
	1430	DO j = nys, nyn
[1580]	1431	DO k = nzb+1, nzt
[861]	1432	!
[1580]	1433	!-- At first, set flags to WS1.
	1434	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1435	!-- in order to handle the left/south flux.
	1436	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1437	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1438	!
[861]	1439	!-- v component - x-direction
	1440	!-- WS1 (18), WS3 (19), WS5 (20)
[1762]	1441	IF ( k <= nzb_v_inner(j,i+1) .OR. &
	1442	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1443	.AND. i == nxl ) .OR. &
	1444	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1445	.AND. i == nxr ) ) &
	1446	THEN
	1447	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1448	!
[861]	1449	!-- WS3
[1886]	1450	ELSEIF ( ( k <= nzb_v_inner(j,i+2) .AND. &
	1451	k > nzb_v_inner(j,i+1) ) .OR. &
	1452	k <= nzb_v_inner(j,i-1) &
[1762]	1453	.OR. &
	1454	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1455	.AND. i == nxr-1 ) .OR. &
	1456	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1457	.AND. i == nxlu ) ) &
	1458	THEN
[861]	1459	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1460	!
	1461	!-- Clear flag for WS1
	1462	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[1886]	1463	ELSEIF ( k > nzb_v_inner(j,i+1) .AND. k > nzb_v_inner(j,i+2) &
	1464	.AND. k > nzb_v_inner(j,i-1) ) &
	1465	THEN
[861]	1466	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1467	!
	1468	!-- Clear flag for WS1
	1469	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1470	ENDIF
	1471	!
	1472	!-- v component - y-direction
	1473	!-- WS1 (21), WS3 (22), WS5 (23)
[1762]	1474	IF ( k <= nzb_v_inner(j+1,i) .OR. &
	1475	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1476	.AND. j <= nysv ) .OR. &
	1477	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1478	.AND. j == nyn ) ) &
	1479	THEN
	1480	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[1886]	1481	ELSEIF ( ( k <= nzb_v_inner(j+2,i) .AND. &
	1482	k > nzb_v_inner(j+1,i) ) .OR. &
	1483	k <= nzb_v_inner(j-1,i) &
	1484	.OR. &
[1762]	1485	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1486	.AND. j == nysv+1) .OR. &
	1487	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1488	.AND. j == nyn-1 ) ) &
	1489	THEN
[861]	1490	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1491	!
	1492	!-- Clear flag for WS1
	1493	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[1886]	1494	ELSEIF ( k > nzb_v_inner(j+1,i) .AND. k > nzb_v_inner(j+2,i) &
	1495	.AND. k > nzb_v_inner(j-1,i) ) &
	1496	THEN
[861]	1497	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1498	!
	1499	!-- Clear flag for WS1
	1500	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1501	ENDIF
	1502	!
	1503	!-- v component - z-direction
	1504	!-- WS1 (24), WS3 (25), WS5 (26)
	1505	flag_set = .FALSE.
	1506	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1507	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1508	flag_set = .TRUE.
	1509	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1510	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1511	flag_set = .TRUE.
	1512	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1513	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1514	ENDIF
	1515
	1516	ENDDO
	1517	ENDDO
	1518	ENDDO
	1519	DO i = nxl, nxr
	1520	DO j = nys, nyn
[1580]	1521	DO k = nzb+1, nzt
[861]	1522	!
[1580]	1523	!-- At first, set flags to WS1.
	1524	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1525	!-- in order to handle the left/south flux.
	1526	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1527	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1528	!
[861]	1529	!-- w component - x-direction
	1530	!-- WS1 (27), WS3 (28), WS5 (29)
[1762]	1531	IF ( k <= nzb_w_inner(j,i+1) .OR. &
	1532	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1533	.AND. i == nxl ) .OR. &
	1534	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1535	.AND. i == nxr ) ) &
	1536	THEN
	1537	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[1886]	1538	ELSEIF ( ( k <= nzb_w_inner(j,i+2) .AND. &
	1539	k > nzb_w_inner(j,i+1) ) .OR. &
	1540	k <= nzb_w_inner(j,i-1) &
	1541	.OR. &
[1762]	1542	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1543	.AND. i == nxr-1 ) .OR. &
	1544	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1545	.AND. i == nxlu ) ) &
	1546	THEN
[861]	1547	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1548	!
	1549	!-- Clear flag for WS1
	1550	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[1886]	1551	ELSEIF ( k > nzb_w_inner(j,i+1) .AND. k > nzb_w_inner(j,i+2) &
	1552	.AND. k > nzb_w_inner(j,i-1) ) &
	1553	THEN
[861]	1554	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1555	!
	1556	!-- Clear flag for WS1
	1557	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1558	ENDIF
	1559	!
	1560	!-- w component - y-direction
	1561	!-- WS1 (30), WS3 (31), WS5 (32)
[1762]	1562	IF ( k <= nzb_w_inner(j+1,i) .OR. &
	1563	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1564	.AND. j == nys ) .OR. &
	1565	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1566	.AND. j == nyn ) ) &
	1567	THEN
	1568	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[1886]	1569	ELSEIF ( ( k <= nzb_w_inner(j+2,i) .AND. &
	1570	k > nzb_w_inner(j+1,i) ) .OR. &
	1571	k <= nzb_w_inner(j-1,i) &
	1572	.OR. &
[1762]	1573	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1574	.AND. j == nysv ) .OR. &
	1575	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1576	.AND. j == nyn-1 ) ) &
	1577	THEN
[861]	1578	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1579	!
	1580	!-- Clear flag for WS1
	1581	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[1886]	1582	ELSEIF ( k > nzb_w_inner(j+1,i) .AND. k > nzb_w_inner(j+2,i) &
	1583	.AND. k > nzb_w_inner(j-1,i) ) &
	1584	THEN
[1221]	1585	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1586	!
	1587	!-- Clear flag for WS1
	1588	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1589	ENDIF
	1590	!
	1591	!-- w component - z-direction
[1679]	1592	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1593	flag_set = .FALSE.
	1594	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1595	.OR. k == nzt ) THEN
	1596	!
	1597	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1598	!-- set, although this is not a prognostic level. However,
	1599	!-- contrary to the advection of u,v and s this is necessary
	1600	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1601	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1602	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1603	flag_set = .TRUE.
	1604	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1605	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1606	flag_set = .TRUE.
	1607	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1608	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1609	ENDIF
	1610
	1611	ENDDO
	1612	ENDDO
	1613	ENDDO
	1614
	1615	ENDIF
	1616
	1617	!
[1677]	1618	!-- Exchange 3D integer wall_flags.
	1619	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1620	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1621	!
	1622	!-- Exchange ghost points for advection flags
	1623	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1624	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1625	!
	1626	!-- Set boundary flags at inflow and outflow boundary in case of
	1627	!-- non-cyclic boundary conditions.
[1762]	1628	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1677]	1629	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1630	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1631	ENDIF
	1632
[1762]	1633	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
[1677]	1634	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1635	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1636	ENDIF
	1637
[1762]	1638	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
[1677]	1639	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1640	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1641	ENDIF
	1642
[1762]	1643	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1677]	1644	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1645	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1646	ENDIF
	1647
	1648	ENDIF
	1649
	1650	!
[1]	1651	!-- In case of topography: limit near-wall mixing length l_wall further:
	1652	!-- Go through all points of the subdomain one by one and look for the closest
	1653	!-- surface
	1654	IF ( TRIM(topography) /= 'flat' ) THEN
	1655	DO i = nxl, nxr
	1656	DO j = nys, nyn
	1657
	1658	nzb_si = nzb_s_inner(j,i)
	1659	vi = vertical_influence(nzb_si)
	1660
	1661	IF ( wall_n(j,i) > 0 ) THEN
	1662	!
	1663	!-- North wall (y distance)
	1664	DO k = wall_n(j,i), nzb_si
[1353]	1665	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1666	ENDDO
	1667	!
	1668	!-- Above North wall (yz distance)
	1669	DO k = nzb_si + 1, nzb_si + vi
[1353]	1670	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1671	SQRT( 0.25_wp * dy**2 + &
[1]	1672	( zu(k) - zw(nzb_si) )**2 ) )
	1673	ENDDO
	1674	!
	1675	!-- Northleft corner (xy distance)
	1676	IF ( corner_nl(j,i) > 0 ) THEN
	1677	DO k = corner_nl(j,i), nzb_si
	1678	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1679	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1680	ENDDO
	1681	!
	1682	!-- Above Northleft corner (xyz distance)
	1683	DO k = nzb_si + 1, nzb_si + vi
[1353]	1684	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1685	SQRT( 0.25_wp * (dx2 + dy2) + &
	1686	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1687	ENDDO
	1688	ENDIF
	1689	!
	1690	!-- Northright corner (xy distance)
	1691	IF ( corner_nr(j,i) > 0 ) THEN
	1692	DO k = corner_nr(j,i), nzb_si
[1353]	1693	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1694	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1695	ENDDO
	1696	!
	1697	!-- Above northright corner (xyz distance)
	1698	DO k = nzb_si + 1, nzb_si + vi
[1353]	1699	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1700	SQRT( 0.25_wp * (dx2 + dy2) + &
	1701	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1702	ENDDO
	1703	ENDIF
	1704	ENDIF
	1705
	1706	IF ( wall_s(j,i) > 0 ) THEN
	1707	!
	1708	!-- South wall (y distance)
	1709	DO k = wall_s(j,i), nzb_si
[1353]	1710	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1711	ENDDO
	1712	!
	1713	!-- Above south wall (yz distance)
[1353]	1714	DO k = nzb_si + 1, nzb_si + vi
	1715	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1716	SQRT( 0.25_wp * dy**2 + &
[1]	1717	( zu(k) - zw(nzb_si) )**2 ) )
	1718	ENDDO
	1719	!
	1720	!-- Southleft corner (xy distance)
	1721	IF ( corner_sl(j,i) > 0 ) THEN
	1722	DO k = corner_sl(j,i), nzb_si
[1353]	1723	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1724	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1725	ENDDO
	1726	!
	1727	!-- Above southleft corner (xyz distance)
	1728	DO k = nzb_si + 1, nzb_si + vi
[1353]	1729	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1730	SQRT( 0.25_wp * (dx2 + dy2) + &
	1731	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1732	ENDDO
	1733	ENDIF
	1734	!
	1735	!-- Southright corner (xy distance)
	1736	IF ( corner_sr(j,i) > 0 ) THEN
	1737	DO k = corner_sr(j,i), nzb_si
[1353]	1738	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1739	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1740	ENDDO
	1741	!
	1742	!-- Above southright corner (xyz distance)
	1743	DO k = nzb_si + 1, nzb_si + vi
[1353]	1744	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1745	SQRT( 0.25_wp * (dx2 + dy2) + &
	1746	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1747	ENDDO
	1748	ENDIF
	1749
	1750	ENDIF
	1751
	1752	IF ( wall_l(j,i) > 0 ) THEN
	1753	!
	1754	!-- Left wall (x distance)
	1755	DO k = wall_l(j,i), nzb_si
[1353]	1756	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1757	ENDDO
	1758	!
	1759	!-- Above left wall (xz distance)
	1760	DO k = nzb_si + 1, nzb_si + vi
[1353]	1761	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1762	SQRT( 0.25_wp * dx**2 + &
	1763	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1764	ENDDO
	1765	ENDIF
	1766
	1767	IF ( wall_r(j,i) > 0 ) THEN
	1768	!
	1769	!-- Right wall (x distance)
	1770	DO k = wall_r(j,i), nzb_si
[1353]	1771	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1772	ENDDO
	1773	!
	1774	!-- Above right wall (xz distance)
	1775	DO k = nzb_si + 1, nzb_si + vi
[1353]	1776	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1777	SQRT( 0.25_wp * dx**2 + &
[1]	1778	( zu(k) - zw(nzb_si) )**2 ) )
	1779	ENDDO
	1780
	1781	ENDIF
	1782
	1783	ENDDO
	1784	ENDDO
	1785
	1786	ENDIF
	1787
	1788	!
	1789	!-- Multiplication with wall_adjustment_factor
	1790	l_wall = wall_adjustment_factor * l_wall
	1791
	1792	!
[709]	1793	!-- Set lateral boundary conditions for l_wall
[667]	1794	CALL exchange_horiz( l_wall, nbgp )
	1795
[1]	1796	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1797	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1798
	1799
	1800	END SUBROUTINE init_grid

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