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source: palm/trunk/SOURCE/init_grid.f90 @ 2088

Last change on this file since 2088 was 2088, checked in by suehring, 7 years ago
Bugfixes in initial salinity profile and generic topography definition in case of ocean simulations
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File size: 61.1 KB

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[1682]	1	!> @file init_grid.f90
[2000]	2	!------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
[2000]	5	! PALM is free software: you can redistribute it and/or modify it under the
	6	! terms of the GNU General Public License as published by the Free Software
	7	! Foundation, either version 3 of the License, or (at your option) any later
	8	! version.
[1036]	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	!
[1818]	17	! Copyright 1997-2016 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[2088]	22	! Bugfix in generic topography in case of ocean simulations
[1969]	23	!
	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 2088 2016-12-19 16:30:25Z suehring $
	27	!
[2038]	28	! 2037 2016-10-26 11:15:40Z knoop
	29	! Anelastic approximation implemented
	30	!
[2022]	31	! 2021 2016-10-07 14:08:57Z suehring
	32	! Bugfix: setting Neumann boundary conditions for topography required for
	33	! topography flags in multigrid_noopt solver
	34	!
[2001]	35	! 2000 2016-08-20 18:09:15Z knoop
	36	! Forced header and separation lines into 80 columns
	37	!
[1995]	38	! 1994 2016-08-15 09:52:21Z suehring
	39	! Bugfix in definition of generic topography
	40	!
[1983]	41	! 1982 2016-08-01 11:04:48Z suehring
	42	! Bugfix concering consistency check for topography
	43	!
[1969]	44	! 1968 2016-07-18 12:01:49Z suehring
[1968]	45	! Changed: PE-wise reading of topography file in order to avoid global definition
	46	! of arrays nzb_local and nzb_tmp. Thereby, topography definition for single
	47	! buildings and street canyons has changed, as well as flag setting for
	48	! multigrid scheme.
	49	!
	50	! Bugfix in checking l_grid anisotropy.
	51	! Simplify initial computation of lwall and vertical_influence, i.e. remove
	52	! nzb_s_inner as it is still zero at this point.
[1932]	53	!
[1943]	54	! 1942 2016-06-14 12:18:18Z suehring
	55	! Topography filter implemented to fill holes resolved by only one grid point.
	56	! Initialization of flags for ws-scheme moved to advec_ws.
	57	!
[1932]	58	! 1931 2016-06-10 12:06:59Z suehring
	59	! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid
	60	!
[1911]	61	! 1910 2016-05-26 06:49:46Z raasch
	62	! Bugfix: if topography is read from file, Neumann conditions are used for the
	63	! nzb_local array (instead of cyclic conditions) in case that non-cyclic
	64	! boundary conditions are switched on for the run
	65	!
[1903]	66	! 1902 2016-05-09 11:18:56Z suehring
[1910]	67	! Set topography flags for multigrid solver only (not for multigrid_fast)
[1903]	68	!
[1887]	69	! 1886 2016-04-21 11:20:47Z suehring
	70	! Bugfix: setting advection flags near walls
	71	! reformulated index values for nzb_v_inner
	72	! variable discriptions added in declaration block
	73	!
[1846]	74	! 1845 2016-04-08 08:29:13Z raasch
	75	! nzb_2d removed
	76	!
[1805]	77	! 1804 2016-04-05 16:30:18Z maronga
	78	! Removed code for parameter file check (__check)
	79	!
[1780]	80	! 1779 2016-03-03 08:01:28Z raasch
	81	! coupling_char is trimmed at every place it occurs, because it can have
	82	! different length now
	83	!
[1763]	84	! 1762 2016-02-25 12:31:13Z hellstea
	85	! Introduction of nested domain feature
	86	!
[1744]	87	! 1743 2016-01-13 10:23:51Z raasch
	88	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	89	! total domain
	90	!
[1692]	91	! 1691 2015-10-26 16:17:44Z maronga
	92	! Renamed prandtl_layer to constant_flux_layer.
	93	!
[1683]	94	! 1682 2015-10-07 23:56:08Z knoop
	95	! Code annotations made doxygen readable
	96	!
[1678]	97	! 1677 2015-10-02 13:25:23Z boeske
	98	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	99	!
[1676]	100	! 1675 2015-10-02 08:28:59Z gronemeier
	101	! Bugfix: Definition of topography grid levels
	102	!
[1662]	103	! 1660 2015-09-21 08:15:16Z gronemeier
	104	! Bugfix: Definition of topography grid levels if vertical grid stretching
	105	! starts below the maximum topography height.
	106	!
[1581]	107	! 1580 2015-04-10 13:43:49Z suehring
	108	! Bugfix: setting flags for 5th order scheme near buildings
	109	!
[1576]	110	! 1575 2015-03-27 09:56:27Z raasch
	111	! adjustments for psolver-queries
	112	!
[1558]	113	! 1557 2015-03-05 16:43:04Z suehring
	114	! Adjustment for monotoinic limiter
	115	!
[1419]	116	! 1418 2014-06-06 13:05:08Z fricke
	117	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	118	! condition and a negative value for dz_stretch_level the condition
	119	! was always true for the whole model domain
	120	!
[1410]	121	! 1409 2014-05-23 12:11:32Z suehring
	122	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	123	! j <= nysv
	124	!
[1354]	125	! 1353 2014-04-08 15:21:23Z heinze
	126	! REAL constants provided with KIND-attribute
	127	!
[1323]	128	! 1322 2014-03-20 16:38:49Z raasch
	129	! REAL constants defined as wp-kind
	130	!
[1321]	131	! 1320 2014-03-20 08:40:49Z raasch
[1320]	132	! ONLY-attribute added to USE-statements,
	133	! kind-parameters added to all INTEGER and REAL declaration statements,
	134	! kinds are defined in new module kinds,
	135	! revision history before 2012 removed,
	136	! comment fields (!:) to be used for variable explanations added to
	137	! all variable declaration statements
[1321]	138	!
[1222]	139	! 1221 2013-09-10 08:59:13Z raasch
	140	! wall_flags_00 introduced to hold bits 32-63,
	141	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	142	! loops optimized for openACC (pres + flow_statistics)
	143	!
[1093]	144	! 1092 2013-02-02 11:24:22Z raasch
	145	! unused variables removed
	146	!
[1070]	147	! 1069 2012-11-28 16:18:43Z maronga
[1779]	148	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	149	! ocean model in case of coupled runs
[1070]	150	!
[1037]	151	! 1036 2012-10-22 13:43:42Z raasch
	152	! code put under GPL (PALM 3.9)
	153	!
[1017]	154	! 1015 2012-09-27 09:23:24Z raasch
	155	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	156	! nzb_w_inner+1
	157	!
[997]	158	! 996 2012-09-07 10:41:47Z raasch
	159	! little reformatting
	160	!
[979]	161	! 978 2012-08-09 08:28:32Z fricke
	162	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	163	! Bugfix: Set wall_flags_0 for inflow boundary
	164	!
[928]	165	! 927 2012-06-06 19:15:04Z raasch
	166	! Wall flags are not set for multigrid method in case of masking method
	167	!
[865]	168	! 864 2012-03-27 15:10:33Z gryschka
[927]	169	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	170	! were not correctly defined for k=1.
[865]	171	!
[863]	172	! 861 2012-03-26 14:18:34Z suehring
[861]	173	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	174	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	175	! model domain.!
[861]	176	! Initialization of nzb_s_inner and nzb_w_inner.
	177	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	178	! while setting wall_flags_0
	179	!
[844]	180	! 843 2012-02-29 15:16:21Z gryschka
	181	! In case of ocean and dirichlet bc for u and v at the bottom
	182	! the first u-level ist defined at same height as the first w-level
	183	!
[819]	184	! 818 2012-02-08 16:11:23Z maronga
	185	! Bugfix: topo_height is only required if topography is used. It is thus now
	186	! allocated in the topography branch
	187	!
[810]	188	! 809 2012-01-30 13:32:58Z maronga
	189	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	190	!
[808]	191	! 807 2012-01-25 11:53:51Z maronga
	192	! New cpp directive "__check" implemented which is used by check_namelist_files
	193	!
[1]	194	! Revision 1.1 1997/08/11 06:17:45 raasch
	195	! Initial revision (Testversion)
	196	!
	197	!
	198	! Description:
	199	! ------------
[1682]	200	!> Creating grid depending constants
[1]	201	!------------------------------------------------------------------------------!
[1682]	202	SUBROUTINE init_grid
	203
[1942]	204	USE advec_ws, &
	205	ONLY: ws_init_flags
[1]	206
[1320]	207	USE arrays_3d, &
	208	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	209	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	210
[1353]	211	USE control_parameters, &
[1910]	212	ONLY: bc_lr_cyc, bc_ns_cyc, building_height, building_length_x, &
[1320]	213	building_length_y, building_wall_left, building_wall_south, &
	214	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	215	canyon_width_x, canyon_width_y, constant_flux_layer, &
	216	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
[1968]	217	dz_stretch_level, dz_stretch_level_index, grid_level, ibc_uv_b, &
	218	io_blocks, io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
[1691]	219	masking_method, maximum_grid_level, message_string, &
[2021]	220	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	221	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
[1762]	222	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	223	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
[2021]	224	wall_adjustment_factor
	225
[1320]	226	USE grid_variables, &
[2037]	227	ONLY: ddx, ddx2, ddy, ddy2, dx, dx2, dy, dy2, fwxm, &
[1320]	228	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	229	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	230
	231	USE indices, &
[1942]	232	ONLY: flags, nbgp, nx, nxl, nxlg, nxl_mg, nxr, nxrg, nxr_mg, &
	233	ny, nyn, nyng, nyn_mg, nys, nys_mg, nysg, nz, nzb, &
[1845]	234	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
	235	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
	236	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
	237	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
[1320]	238	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	239	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	240	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	241	wall_flags_9
	242
	243	USE kinds
	244
[1]	245	USE pegrid
	246
	247	IMPLICIT NONE
	248
[1968]	249	INTEGER(iwp) :: bh !< temporary vertical index of building height
	250	INTEGER(iwp) :: blx !< grid point number of building size along x
	251	INTEGER(iwp) :: bly !< grid point number of building size along y
	252	INTEGER(iwp) :: bxl !< index for left building wall
	253	INTEGER(iwp) :: bxr !< index for right building wall
	254	INTEGER(iwp) :: byn !< index for north building wall
	255	INTEGER(iwp) :: bys !< index for south building wall
	256	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
	257	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
	258	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
	259	INTEGER(iwp) :: cxl !< index for left canyon wall
	260	INTEGER(iwp) :: cxr !< index for right canyon wall
	261	INTEGER(iwp) :: cyn !< index for north canyon wall
	262	INTEGER(iwp) :: cys !< index for south canyon wall
	263	INTEGER(iwp) :: i !< index variable along x
	264	INTEGER(iwp) :: ii !< loop variable for reading topography file
	265	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
	266	INTEGER(iwp) :: j !< index variable along y
	267	INTEGER(iwp) :: k !< index variable along z
	268	INTEGER(iwp) :: l !< loop variable
	269	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
	270	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
	271	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
	272	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
	273	INTEGER(iwp) :: nzb_local_max !< vertical grid index of maximum topography height
	274	INTEGER(iwp) :: nzb_local_min !< vertical grid index of minimum topography height
	275	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
	276	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
	277	INTEGER(iwp) :: num_hole !< number of holes (in topography) resolved by only one grid point
	278	INTEGER(iwp) :: num_hole_l !< number of holes (in topography) resolved by only one grid point on local PE
	279	INTEGER(iwp) :: num_wall !< number of surrounding vertical walls for a single grid point
	280	INTEGER(iwp) :: skip_n_rows !< counting variable to skip rows while reading topography file
	281	INTEGER(iwp) :: vi !< dummy for vertical influence
[1]	282
[1886]	283	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
[1931]	284	vertical_influence !< number of vertical grid points above obstacle where adjustment of near-wall mixing length is required
[1886]	285
[1968]	286	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of north-left corner location to limit near-wall mixing length
	287	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
	288	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
	289	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
	290	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography top at cell-center
	291	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate topography indices on u- and v-grid
	292	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to adjacent left-facing wall
	293	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
	294	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
	295	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
[1]	296
[1968]	297	REAL(wp) :: dum !< dummy variable to skip columns while reading topography file
[1886]	298	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
[861]	299
[1968]	300	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for topography height
	301	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zu_s_inner_l !< dummy array on global scale to write topography output array
	302	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zw_w_inner_l !< dummy array on global scale to write topography output array
[1]	303
[667]	304
[1]	305	!
[709]	306	!-- Calculation of horizontal array bounds including ghost layers
[667]	307	nxlg = nxl - nbgp
	308	nxrg = nxr + nbgp
	309	nysg = nys - nbgp
	310	nyng = nyn + nbgp
[709]	311
[667]	312	!
[1]	313	!-- Allocate grid arrays
[1353]	314	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	315	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	316
	317	!
	318	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	319	IF ( dz == -1.0_wp ) THEN
[254]	320	message_string = 'missing dz'
	321	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	322	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	323	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	324	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	325	ENDIF
[94]	326
[1]	327	!
[94]	328	!-- Define the vertical grid levels
	329	IF ( .NOT. ocean ) THEN
	330	!
	331	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	332	!-- The second u-level (k=1) corresponds to the top of the
[94]	333	!-- Prandtl-layer.
[667]	334
	335	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	336	zu(0) = 0.0_wp
	337	! zu(0) = - dz * 0.5_wp
[667]	338	ELSE
[1353]	339	zu(0) = - dz * 0.5_wp
[667]	340	ENDIF
[1353]	341	zu(1) = dz * 0.5_wp
[1]	342
[94]	343	dz_stretch_level_index = nzt+1
	344	dz_stretched = dz
	345	DO k = 2, nzt+1
	346	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	347	dz_stretched = dz_stretched * dz_stretch_factor
	348	dz_stretched = MIN( dz_stretched, dz_max )
	349	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	350	ENDIF
	351	zu(k) = zu(k-1) + dz_stretched
	352	ENDDO
[1]	353
	354	!
[94]	355	!-- Compute the w-levels. They are always staggered half-way between the
[843]	356	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	357	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	358	!-- The top w-level is extrapolated linearly.
[1353]	359	zw(0) = 0.0_wp
[94]	360	DO k = 1, nzt
[1353]	361	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	362	ENDDO
[1353]	363	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	364
[94]	365	ELSE
[1]	366	!
[843]	367	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	368	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	369	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	370	!-- w-level are defined at same height, but staggered from the second level.
	371	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	372	zu(nzt+1) = dz * 0.5_wp
	373	zu(nzt) = - dz * 0.5_wp
[94]	374
	375	dz_stretch_level_index = 0
	376	dz_stretched = dz
	377	DO k = nzt-1, 0, -1
[1418]	378	!
	379	!-- The default value of dz_stretch_level is positive, thus the first
	380	!-- condition is always true. Hence, the second condition is necessary.
	381	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	382	.AND. dz_stretched < dz_max ) THEN
[94]	383	dz_stretched = dz_stretched * dz_stretch_factor
	384	dz_stretched = MIN( dz_stretched, dz_max )
	385	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	386	ENDIF
	387	zu(k) = zu(k+1) - dz_stretched
	388	ENDDO
	389
	390	!
	391	!-- Compute the w-levels. They are always staggered half-way between the
[843]	392	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	393	!-- at the ground. In this case the first u- and w-level are defined at
	394	!-- same height. The top w-level (nzt+1) is not used but set for
	395	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	396	zw(nzt+1) = dz
[1353]	397	zw(nzt) = 0.0_wp
[94]	398	DO k = 0, nzt
[1353]	399	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	400	ENDDO
	401
[843]	402	!
	403	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	404	!-- at same height.
	405	IF ( ibc_uv_b == 0 ) THEN
	406	zu(0) = zw(0)
	407	ENDIF
	408
[94]	409	ENDIF
	410
	411	!
[1]	412	!-- Compute grid lengths.
	413	DO k = 1, nzt+1
	414	dzu(k) = zu(k) - zu(k-1)
[1353]	415	ddzu(k) = 1.0_wp / dzu(k)
[1]	416	dzw(k) = zw(k) - zw(k-1)
[1353]	417	ddzw(k) = 1.0_wp / dzw(k)
[1]	418	ENDDO
	419
	420	DO k = 1, nzt
[1353]	421	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	422	ENDDO
[667]	423
	424	!
[709]	425	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	426	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	427	!-- is only dz/2, but should be dz. Therefore, an additional array
	428	!-- containing with appropriate grid information is created for these
	429	!-- solvers.
[1575]	430	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	431	ALLOCATE( ddzu_pres(1:nzt+1) )
	432	ddzu_pres = ddzu
[864]	433	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[1]	434	ENDIF
	435
	436	!
	437	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	438	ddx = 1.0_wp / dx
	439	ddy = 1.0_wp / dy
[1]	440	dx2 = dx * dx
	441	dy2 = dy * dy
[1353]	442	ddx2 = 1.0_wp / dx2
	443	ddy2 = 1.0_wp / dy2
[1]	444
	445	!
	446	!-- Compute the grid-dependent mixing length.
	447	DO k = 1, nzt
[1322]	448	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	449	ENDDO
	450
	451	!
	452	!-- Allocate outer and inner index arrays for topography and set
[114]	453	!-- defaults.
[667]	454
[114]	455	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	456	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
	457	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1968]	458	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
	459
[667]	460	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	461	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	462	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	463	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	464	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	465	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	466	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	467	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	468	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	469	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	470	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	471	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	472	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	473	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	474	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	475	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
[1968]	476	nzb_local(nysg:nyng,nxlg:nxrg), &
	477	nzb_tmp(nysg:nyng,nxlg:nxrg), &
[1221]	478	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	479	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	480	wall_e_x(nysg:nyng,nxlg:nxrg), &
	481	wall_e_y(nysg:nyng,nxlg:nxrg), &
	482	wall_u(nysg:nyng,nxlg:nxrg), &
	483	wall_v(nysg:nyng,nxlg:nxrg), &
	484	wall_w_x(nysg:nyng,nxlg:nxrg), &
	485	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	486
	487
[667]	488
	489	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	490
[818]	491
[1]	492	nzb_s_inner = nzb; nzb_s_outer = nzb
	493	nzb_u_inner = nzb; nzb_u_outer = nzb
	494	nzb_v_inner = nzb; nzb_v_outer = nzb
	495	nzb_w_inner = nzb; nzb_w_outer = nzb
	496
[1353]	497	rflags_s_inner = 1.0_wp
	498	rflags_invers = 1.0_wp
[1221]	499
[1]	500	!
[19]	501	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	502	!-- form (which does not use surface fluxes) is applied
[1691]	503	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	504	nzb_diff = nzb + 2
	505	ELSE
	506	nzb_diff = nzb + 1
	507	ENDIF
[19]	508	IF ( use_top_fluxes ) THEN
	509	nzt_diff = nzt - 1
	510	ELSE
	511	nzt_diff = nzt
	512	ENDIF
[1]	513
	514	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	515	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	516
[1353]	517	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	518	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	519	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	520	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	521
	522	!
	523	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	524	!-- for the moment,
	525	!-- multiplication with wall_adjustment_factor near the end of this routine
	526	l_wall(nzb,:,:) = l_grid(1)
	527	DO k = nzb+1, nzt
	528	l_wall(k,:,:) = l_grid(k)
	529	ENDDO
	530	l_wall(nzt+1,:,:) = l_grid(nzt)
	531
	532	ALLOCATE ( vertical_influence(nzb:nzt) )
	533	DO k = 1, nzt
	534	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	535	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	536	ENDDO
	537
[1968]	538	DO k = 1, nzt
[1353]	539	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	540	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	541	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	542	'threshold given by only local', &
	543	' &horizontal reduction of near_wall ', &
	544	'mixing length l_wall', &
	545	' &starting from height level k = ', k, '.'
	546	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	547	EXIT
	548	ENDIF
	549	ENDDO
	550	vertical_influence(0) = vertical_influence(1)
	551
[1968]	552	DO k = nzb + 1, nzb + vertical_influence(nzb)
	553	l_wall(k,:,:) = zu(k) - zw(nzb)
[1]	554	ENDDO
	555
	556	!
	557	!-- Set outer and inner index arrays for non-flat topography.
	558	!-- Here consistency checks concerning domain size and periodicity are
	559	!-- necessary.
	560	!-- Within this SELECT CASE structure only nzb_local is initialized
	561	!-- individually depending on the chosen topography type, all other index
	562	!-- arrays are initialized further below.
	563	SELECT CASE ( TRIM( topography ) )
	564
	565	CASE ( 'flat' )
	566	!
[555]	567	!-- nzb_local is required for the multigrid solver
	568	nzb_local = 0
[1]	569
	570	CASE ( 'single_building' )
	571	!
	572	!-- Single rectangular building, by default centered in the middle of the
	573	!-- total domain
	574	blx = NINT( building_length_x / dx )
	575	bly = NINT( building_length_y / dy )
[2088]	576	IF ( .NOT. ocean ) THEN
	577	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	578	ELSE
	579	bh = MINLOC( ABS( zw - zw(0) - building_height ), 1 ) - 1
	580	ENDIF
	581
[1675]	582	IF ( ABS( zw(bh ) - building_height ) == &
	583	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	584
[1322]	585	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	586	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	587	ENDIF
	588	bxl = NINT( building_wall_left / dx )
	589	bxr = bxl + blx
	590
[1322]	591	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	592	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	593	ENDIF
	594	bys = NINT( building_wall_south / dy )
	595	byn = bys + bly
	596
	597	!
	598	!-- Building size has to meet some requirements
	599	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	600	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	601	WRITE( message_string, * ) 'inconsistent building parameters:', &
	602	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	603	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	604	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	605	ENDIF
	606
	607	!
[1968]	608	!-- Define the building.
[1]	609	nzb_local = 0
[1968]	610	IF ( bxl <= nxr .AND. bxr >= nxl .AND. &
	611	bys <= nyn .AND. byn >= nys ) &
	612	nzb_local(MAX(nys,bys):MIN(nyn,byn),MAX(nxl,bxl):MIN(nxr,bxr)) = bh
[1]	613
[1994]	614	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	615
[240]	616	CASE ( 'single_street_canyon' )
	617	!
	618	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	619	!-- The canyon is centered in the other direction by default.
[1322]	620	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	621	!
	622	!-- Street canyon in y direction
	623	cwx = NINT( canyon_width_x / dx )
[1322]	624	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	625	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	626	ENDIF
	627	cxl = NINT( canyon_wall_left / dx )
	628	cxr = cxl + cwx
	629
[1322]	630	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	631	!
	632	!-- Street canyon in x direction
	633	cwy = NINT( canyon_width_y / dy )
[1322]	634	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	635	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	636	ENDIF
	637	cys = NINT( canyon_wall_south / dy )
	638	cyn = cys + cwy
	639
	640	ELSE
[254]	641
	642	message_string = 'no street canyon width given'
	643	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	644
[240]	645	ENDIF
	646
[2088]	647	IF ( .NOT. ocean ) THEN
	648	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	649	ELSE
	650	ch = MINLOC( ABS( zw - zw(0) - canyon_height ), 1 ) - 1
	651	ENDIF
	652
[1675]	653	IF ( ABS( zw(ch ) - canyon_height ) == &
	654	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	655
[240]	656	dp_level_ind_b = ch
	657	!
	658	!-- Street canyon size has to meet some requirements
[1322]	659	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	660	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	661	( ch < 3 ) ) THEN
[1353]	662	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	663	'&cxl=', cxl, 'cxr=', cxr, &
	664	'cwx=', cwx, &
[254]	665	'ch=', ch, 'nx=', nx, 'ny=', ny
	666	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	667	ENDIF
[1322]	668	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	669	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	670	( ch < 3 ) ) THEN
[1353]	671	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	672	'&cys=', cys, 'cyn=', cyn, &
	673	'cwy=', cwy, &
[254]	674	'ch=', ch, 'nx=', nx, 'ny=', ny
	675	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	676	ENDIF
	677	ENDIF
[1353]	678	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	679	canyon_width_y /= 9999999.9_wp ) THEN
	680	message_string = 'inconsistent canyon parameters:' // &
	681	'&street canyon can only be oriented' // &
[254]	682	'&either in x- or in y-direction'
	683	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	684	ENDIF
	685
	686	nzb_local = ch
[1322]	687	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1968]	688	IF ( cxl <= nxr .AND. cxr >= nxl ) &
	689	nzb_local(:,MAX(nxl,cxl+1):MIN(nxr,cxr-1)) = 0
[1322]	690	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1968]	691	IF ( cys <= nyn .AND. cyn >= nys ) &
	692	nzb_local(MAX(nys,cys+1):MIN(nyn,cyn-1),:) = 0
[240]	693	ENDIF
	694
[1994]	695	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	696
[1]	697	CASE ( 'read_from_file' )
[759]	698
[1968]	699	ALLOCATE ( topo_height(nys:nyn,nxl:nxr) )
[818]	700
[759]	701	DO ii = 0, io_blocks-1
	702	IF ( ii == io_group ) THEN
	703
[1]	704	!
[759]	705	!-- Arbitrary irregular topography data in PALM format (exactly
	706	!-- matching the grid size and total domain size)
[1779]	707	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	708	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[1968]	709	!
	710	!-- Read topography PE-wise. Rows are read from nyn to nys, columns
	711	!-- are read from nxl to nxr. At first, ny-nyn rows need to be skipped.
	712	skip_n_rows = 0
	713	DO WHILE ( skip_n_rows < ny - nyn )
	714	READ( 90, * )
	715	skip_n_rows = skip_n_rows + 1
[759]	716	ENDDO
[1968]	717	!
	718	!-- Read data from nyn to nys and nxl to nxr. Therefore, skip
	719	!-- column until nxl-1 is reached
	720	DO j = nyn, nys, -1
	721	READ( 90, *, ERR=11, END=11 ) &
	722	( dum, i = 0, nxl-1 ), &
	723	( topo_height(j,i), i = nxl, nxr )
	724	ENDDO
[759]	725
	726	GOTO 12
	727
[1779]	728	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	729	' does not exist'
[759]	730	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	731
[1779]	732	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	733	TRIM( coupling_char )
[759]	734	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	735
	736	12 CLOSE( 90 )
	737
	738	ENDIF
[1804]	739	#if defined( __parallel )
[759]	740	CALL MPI_BARRIER( comm2d, ierr )
	741	#endif
[559]	742	ENDDO
[759]	743
[1]	744	!
	745	!-- Calculate the index height of the topography
[1968]	746	nzb_local = 0
	747	DO i = nxl, nxr
	748	DO j = nys, nyn
[1675]	749	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	750	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	751	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	752	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	753	ENDDO
	754	ENDDO
[818]	755
	756	DEALLOCATE ( topo_height )
[1942]	757	!
	758	!-- Filter topography, i.e. fill holes resolved by only one grid point.
	759	!-- Such holes are suspected to lead to velocity blow-ups as continuity
	760	!-- equation on discrete grid cannot be fulfilled in such case.
	761	!-- For now, check only for holes and fill them to the lowest height level
	762	!-- of the directly adjoining grid points along x- and y- direction.
	763	!-- Before checking for holes, set lateral boundary conditions for
	764	!-- topography. After hole-filling, boundary conditions must be set again!
[1968]	765	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	766
	767	IF ( .NOT. bc_ns_cyc ) THEN
	768	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
	769	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
[1942]	770	ENDIF
[1910]	771
[1968]	772	IF ( .NOT. bc_lr_cyc ) THEN
	773	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
	774	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
[1942]	775	ENDIF
	776
[1968]	777	num_hole_l = 0
	778	DO i = nxl, nxr
	779	DO j = nys, nyn
[1942]	780
	781	num_wall = 0
	782
	783	IF ( nzb_local(j-1,i) > nzb_local(j,i) ) &
	784	num_wall = num_wall + 1
	785	IF ( nzb_local(j+1,i) > nzb_local(j,i) ) &
	786	num_wall = num_wall + 1
	787	IF ( nzb_local(j,i-1) > nzb_local(j,i) ) &
	788	num_wall = num_wall + 1
	789	IF ( nzb_local(j,i+1) > nzb_local(j,i) ) &
	790	num_wall = num_wall + 1
	791
	792	IF ( num_wall == 4 ) THEN
	793	nzb_local(j,i) = MIN( nzb_local(j-1,i), nzb_local(j+1,i), &
	794	nzb_local(j,i-1), nzb_local(j,i+1) )
[1968]	795	num_hole_l = num_hole_l + 1
[1942]	796	ENDIF
	797	ENDDO
	798	ENDDO
[114]	799	!
[1968]	800	!-- Count the total number of holes, required for informative message.
	801	#if defined( __parallel )
	802	CALL MPI_ALLREDUCE( num_hole_l, num_hole, 1, MPI_INTEGER, MPI_SUM, &
	803	comm2d, ierr )
	804	#else
	805	num_hole = num_hole_l
	806	#endif
	807	!
[1942]	808	!-- Create an informative message if any hole was removed.
[1968]	809	IF ( num_hole > 0 ) THEN
[1942]	810	WRITE( message_string, * ) num_hole, 'hole(s) resolved by only '//&
	811	'one grid point were filled'
	812	CALL message( 'init_grid', 'PA0430', 0, 0, 0, 6, 0 )
	813	ENDIF
	814	!
[1968]	815	!-- Exchange ghost-points, as well as add cyclic or Neumann boundary
	816	!-- conditions.
	817	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	818
	819	IF ( .NOT. bc_ns_cyc ) THEN
	820	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
	821	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
[1910]	822	ENDIF
[667]	823
[1968]	824	IF ( .NOT. bc_lr_cyc ) THEN
	825	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
	826	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
[1910]	827	ENDIF
	828
[1]	829	CASE DEFAULT
	830	!
	831	!-- The DEFAULT case is reached either if the parameter topography
[217]	832	!-- contains a wrong character string or if the user has defined a special
[1]	833	!-- case in the user interface. There, the subroutine user_init_grid
	834	!-- checks which of these two conditions applies.
[1968]	835	CALL user_init_grid( nzb_local )
[1]	836
	837	END SELECT
	838	!
[861]	839	!-- Determine the maximum level of topography. Furthermore it is used for
	840	!-- steering the degradation of order of the applied advection scheme.
[978]	841	!-- In case of non-cyclic lateral boundaries, the order of the advection
[1968]	842	!-- scheme has to be reduced up to nzt (required at the lateral boundaries).
	843	#if defined( __parallel )
	844	CALL MPI_ALLREDUCE( MAXVAL( nzb_local ) + 1, nzb_max, 1, MPI_INTEGER, &
	845	MPI_MAX, comm2d, ierr )
	846	#else
[1677]	847	nzb_max = MAXVAL( nzb_local ) + 1
[1968]	848	#endif
[1353]	849	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	850	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	851	nest_domain ) &
	852	THEN
	853	nzb_max = nzt
[978]	854	ENDIF
	855
[861]	856	!
[1]	857	!-- Consistency checks and index array initialization are only required for
[217]	858	!-- non-flat topography, also the initialization of topography height arrays
[49]	859	!-- zu_s_inner and zw_w_inner
[1]	860	IF ( TRIM( topography ) /= 'flat' ) THEN
[1968]	861	#if defined( __parallel )
	862	CALL MPI_ALLREDUCE( MAXVAL( nzb_local ), nzb_local_max, 1, MPI_INTEGER, &
	863	MPI_MAX, comm2d, ierr )
[1982]	864	CALL MPI_ALLREDUCE( MINVAL( nzb_local ), nzb_local_min, 1, MPI_INTEGER, &
[1968]	865	MPI_MIN, comm2d, ierr )
	866	#else
	867	nzb_local_max = MAXVAL( nzb_local )
	868	nzb_local_min = MINVAL( nzb_local )
	869	#endif
[1982]	870
[1]	871	!
	872	!-- Consistency checks
[1968]	873	IF ( nzb_local_min < 0 .OR. nzb_local_max > nz + 1 ) THEN
[1353]	874	WRITE( message_string, * ) 'nzb_local values are outside the', &
	875	'model domain', &
[1968]	876	'&MINVAL( nzb_local ) = ', nzb_local_min, &
	877	'&MAXVAL( nzb_local ) = ', nzb_local_max
[254]	878	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	879	ENDIF
	880
[217]	881	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	882	!
[217]	883	!-- The array nzb_local as defined using the 'cell_edge' convention
	884	!-- describes the actual total size of topography which is defined at the
	885	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	886	!-- on the topography walls in y-direction. However, PALM uses individual
	887	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	888	!-- Therefore, the extent of topography in nzb_local is now reduced by
	889	!-- 1dx at the E topography walls and by 1dy at the N topography walls
[1968]	890	!-- to form the basis for nzb_s_inner.
	891	!-- Note, the reverse memory access (i-j instead of j-i) is absolutely
	892	!-- required at this point.
	893	DO j = nys+1, nyn+1
	894	DO i = nxl-1, nxr
[217]	895	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	896	ENDDO
[134]	897	ENDDO
[1968]	898	!
	899	!-- Exchange ghost points
	900	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	901
	902	DO i = nxl, nxr+1
	903	DO j = nys-1, nyn
[217]	904	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	905	ENDDO
[134]	906	ENDDO
[1968]	907	!
	908	!-- Exchange ghost points
	909	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
[217]	910	ENDIF
[1]	911	!
	912	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[1968]	913	nzb_s_inner = nzb_local
	914	nzb_w_inner = nzb_local
[1]	915
	916	!
	917	!-- Initialize remaining index arrays:
	918	!-- first pre-initialize them with nzb_s_inner...
	919	nzb_u_inner = nzb_s_inner
	920	nzb_u_outer = nzb_s_inner
	921	nzb_v_inner = nzb_s_inner
	922	nzb_v_outer = nzb_s_inner
	923	nzb_w_outer = nzb_s_inner
	924	nzb_s_outer = nzb_s_inner
	925
	926	!
	927	!-- ...then extend pre-initialized arrays in their according directions
	928	!-- based on nzb_local using nzb_tmp as a temporary global index array
	929
	930	!
	931	!-- nzb_s_outer:
	932	!-- extend nzb_local east-/westwards first, then north-/southwards
[1968]	933	nzb_tmp = nzb_local
	934	DO j = nys, nyn
	935	DO i = nxl, nxr
[1353]	936	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	937	nzb_local(j,i+1) )
	938	ENDDO
	939	ENDDO
[1968]	940
	941	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	942
[1]	943	DO i = nxl, nxr
	944	DO j = nys, nyn
[1353]	945	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	946	nzb_tmp(j+1,i) )
	947	ENDDO
	948	!
	949	!-- non-cyclic boundary conditions (overwritten by call of
	950	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	951	IF ( nys == 0 ) THEN
	952	j = -1
	953	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	954	ENDIF
[1743]	955	IF ( nyn == ny ) THEN
[1]	956	j = ny + 1
	957	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	958	ENDIF
	959	ENDDO
	960	!
	961	!-- nzb_w_outer:
	962	!-- identical to nzb_s_outer
	963	nzb_w_outer = nzb_s_outer
	964
	965	!
	966	!-- nzb_u_inner:
	967	!-- extend nzb_local rightwards only
[1968]	968	nzb_tmp = nzb_local
	969	DO j = nys, nyn
	970	DO i = nxl, nxr
[1]	971	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	972	ENDDO
	973	ENDDO
[1968]	974
	975	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	976
	977	nzb_u_inner = nzb_tmp
[1]	978	!
	979	!-- nzb_u_outer:
	980	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	981	DO i = nxl, nxr
	982	DO j = nys, nyn
[1353]	983	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	984	nzb_tmp(j+1,i) )
	985	ENDDO
	986	!
	987	!-- non-cyclic boundary conditions (overwritten by call of
	988	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	989	IF ( nys == 0 ) THEN
	990	j = -1
	991	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	992	ENDIF
[1743]	993	IF ( nyn == ny ) THEN
[1]	994	j = ny + 1
	995	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	996	ENDIF
	997	ENDDO
	998
	999	!
	1000	!-- nzb_v_inner:
	1001	!-- extend nzb_local northwards only
[1968]	1002	nzb_tmp = nzb_local
	1003	DO i = nxl, nxr
	1004	DO j = nys, nyn
[1]	1005	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	1006	ENDDO
	1007	ENDDO
[1968]	1008
	1009	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	1010	nzb_v_inner = nzb_tmp
[1]	1011
	1012	!
	1013	!-- nzb_v_outer:
	1014	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	1015	DO j = nys, nyn
	1016	DO i = nxl, nxr
[1353]	1017	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	1018	nzb_tmp(j,i+1) )
	1019	ENDDO
	1020	!
	1021	!-- non-cyclic boundary conditions (overwritten by call of
	1022	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1023	IF ( nxl == 0 ) THEN
	1024	i = -1
	1025	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	1026	ENDIF
	1027	IF ( nxr == nx ) THEN
	1028	i = nx + 1
	1029	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	1030	ENDIF
	1031	ENDDO
[1804]	1032
[1]	1033	!
	1034	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	1035	!-- boundary conditions, if applicable.
	1036	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	1037	!-- they do not require exchange and are not included here.
[1968]	1038	CALL exchange_horiz_2d_int( nzb_u_inner, nys, nyn, nxl, nxr, nbgp )
	1039	CALL exchange_horiz_2d_int( nzb_u_outer, nys, nyn, nxl, nxr, nbgp )
	1040	CALL exchange_horiz_2d_int( nzb_v_inner, nys, nyn, nxl, nxr, nbgp )
	1041	CALL exchange_horiz_2d_int( nzb_v_outer, nys, nyn, nxl, nxr, nbgp )
	1042	CALL exchange_horiz_2d_int( nzb_w_outer, nys, nyn, nxl, nxr, nbgp )
	1043	CALL exchange_horiz_2d_int( nzb_s_outer, nys, nyn, nxl, nxr, nbgp )
[1]	1044
[49]	1045	!
	1046	!-- Allocate and set the arrays containing the topography height
[1968]	1047	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1), &
	1048	zu_s_inner_l(0:nx+1,0:ny+1), zw_w_inner_l(0:nx+1,0:ny+1) )
	1049
	1050	zu_s_inner = 0.0_wp
	1051	zw_w_inner = 0.0_wp
	1052	zu_s_inner_l = 0.0_wp
	1053	zw_w_inner_l = 0.0_wp
	1054
	1055	DO i = nxl, nxr
	1056	DO j = nys, nyn
	1057	zu_s_inner_l(i,j) = zu(nzb_local(j,i))
	1058	zw_w_inner_l(i,j) = zw(nzb_local(j,i))
	1059	ENDDO
	1060	ENDDO
	1061
	1062	#if defined( __parallel )
	1063	CALL MPI_REDUCE( zu_s_inner_l, zu_s_inner, (nx+2)*(ny+2), &
	1064	MPI_REAL, MPI_SUM, 0, comm2d, ierr )
	1065	CALL MPI_REDUCE( zw_w_inner_l, zw_w_inner, (nx+2)*(ny+2), &
	1066	MPI_REAL, MPI_SUM, 0, comm2d, ierr )
	1067	#else
	1068	zu_s_inner = zu_s_inner_l
	1069	zw_w_inner = zw_w_inner_l
	1070	#endif
[49]	1071
[1968]	1072	DEALLOCATE( zu_s_inner_l, zw_w_inner_l )
	1073	IF ( myid /= 0 ) DEALLOCATE( zu_s_inner, zw_w_inner )
[1221]	1074	!
[1968]	1075	!-- Set south and left ghost points, required for netcdf output
	1076	IF ( myid == 0 ) THEN
	1077	IF( bc_lr_cyc ) THEN
	1078	zu_s_inner(nx+1,:) = zu_s_inner(0,:)
	1079	zw_w_inner(nx+1,:) = zw_w_inner(0,:)
	1080	ELSE
	1081	zu_s_inner(nx+1,:) = zu_s_inner(nx,:)
	1082	zw_w_inner(nx+1,:) = zw_w_inner(nx,:)
	1083	ENDIF
	1084	IF( bc_ns_cyc ) THEN
	1085	zu_s_inner(:,ny+1) = zu_s_inner(:,0)
	1086	zw_w_inner(:,ny+1) = zw_w_inner(:,0)
	1087	ELSE
	1088	zu_s_inner(:,ny+1) = zu_s_inner(:,ny)
	1089	zw_w_inner(:,ny+1) = zw_w_inner(:,ny)
	1090	ENDIF
	1091	ENDIF
	1092	!
[1221]	1093	!-- Set flag arrays to be used for masking of grid points
	1094	DO i = nxlg, nxrg
	1095	DO j = nysg, nyng
	1096	DO k = nzb, nzt+1
[1353]	1097	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	1098	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	1099	ENDDO
	1100	ENDDO
	1101	ENDDO
[1804]	1102
[1]	1103	ENDIF
[1968]	1104	!
	1105	!-- Deallocate temporary array, as it might be reused for different
	1106	!-- grid-levels further below.
	1107	DEALLOCATE( nzb_tmp )
[1]	1108
	1109	!
	1110	!-- Set the individual index arrays which define the k index from which on
	1111	!-- the usual finite difference form (which does not use surface fluxes) is
	1112	!-- applied
[1691]	1113	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	1114	nzb_diff_u = nzb_u_inner + 2
	1115	nzb_diff_v = nzb_v_inner + 2
	1116	nzb_diff_s_inner = nzb_s_inner + 2
	1117	nzb_diff_s_outer = nzb_s_outer + 2
	1118	ELSE
	1119	nzb_diff_u = nzb_u_inner + 1
	1120	nzb_diff_v = nzb_v_inner + 1
	1121	nzb_diff_s_inner = nzb_s_inner + 1
	1122	nzb_diff_s_outer = nzb_s_outer + 1
	1123	ENDIF
	1124
	1125	!
	1126	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	1127	!-- for limitation of near-wall mixing length l_wall further below
	1128	corner_nl = 0
	1129	corner_nr = 0
	1130	corner_sl = 0
	1131	corner_sr = 0
	1132	wall_l = 0
	1133	wall_n = 0
	1134	wall_r = 0
	1135	wall_s = 0
	1136
	1137	DO i = nxl, nxr
	1138	DO j = nys, nyn
	1139	!
	1140	!-- u-component
	1141	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1142	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1143	fym(j,i) = 0.0_wp
	1144	fyp(j,i) = 1.0_wp
[1]	1145	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1146	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1147	fym(j,i) = 1.0_wp
	1148	fyp(j,i) = 0.0_wp
[1]	1149	ENDIF
	1150	!
	1151	!-- v-component
	1152	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1153	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1154	fxm(j,i) = 0.0_wp
	1155	fxp(j,i) = 1.0_wp
[1]	1156	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1157	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1158	fxm(j,i) = 1.0_wp
	1159	fxp(j,i) = 0.0_wp
[1]	1160	ENDIF
	1161	!
	1162	!-- w-component, also used for scalars, separate arrays for shear
	1163	!-- production of tke
	1164	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1165	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1166	wall_w_y(j,i) = 1.0_wp
	1167	fwym(j,i) = 0.0_wp
	1168	fwyp(j,i) = 1.0_wp
[1]	1169	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1170	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1171	wall_w_y(j,i) = 1.0_wp
	1172	fwym(j,i) = 1.0_wp
	1173	fwyp(j,i) = 0.0_wp
[1]	1174	ENDIF
	1175	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1176	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1177	wall_w_x(j,i) = 1.0_wp
	1178	fwxm(j,i) = 0.0_wp
	1179	fwxp(j,i) = 1.0_wp
[1]	1180	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1181	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1182	wall_w_x(j,i) = 1.0_wp
	1183	fwxm(j,i) = 1.0_wp
	1184	fwxp(j,i) = 0.0_wp
[1]	1185	ENDIF
	1186	!
	1187	!-- Wall and corner locations inside buildings for limitation of
	1188	!-- near-wall mixing length l_wall
	1189	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1190
	1191	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1192
	1193	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1194	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1195	nzb_s_inner(j,i-1) ) + 1
	1196	ENDIF
	1197
	1198	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1199	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1200	nzb_s_inner(j,i+1) ) + 1
	1201	ENDIF
	1202
	1203	ENDIF
	1204
	1205	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1206
	1207	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1208	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1209	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1210	nzb_s_inner(j,i-1) ) + 1
	1211	ENDIF
	1212
	1213	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1214	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1215	nzb_s_inner(j,i+1) ) + 1
	1216	ENDIF
	1217
	1218	ENDIF
	1219
	1220	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1221	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1222	ENDIF
	1223
	1224	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1225	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1226	ENDIF
	1227
	1228	ENDDO
	1229	ENDDO
	1230	!
[1931]	1231	!-- Calculate wall flag arrays for the multigrid method.
	1232	!-- Please note, wall flags are only applied in the not cache-optimized
	1233	!-- version.
	1234	IF ( psolver == 'multigrid_noopt' ) THEN
[1968]	1235
[114]	1236	!
[1968]	1237	!-- Gridpoint increment of the current level.
[114]	1238	inc = 1
	1239	DO l = maximum_grid_level, 1 , -1
[1968]	1240	!
	1241	!-- Set grid_level as it is required for exchange_horiz_2d_int
	1242	grid_level = l
[114]	1243
	1244	nxl_l = nxl_mg(l)
	1245	nxr_l = nxr_mg(l)
	1246	nys_l = nys_mg(l)
	1247	nyn_l = nyn_mg(l)
	1248	nzt_l = nzt_mg(l)
	1249	!
	1250	!-- Assign the flag level to be calculated
	1251	SELECT CASE ( l )
	1252	CASE ( 1 )
	1253	flags => wall_flags_1
	1254	CASE ( 2 )
	1255	flags => wall_flags_2
	1256	CASE ( 3 )
	1257	flags => wall_flags_3
	1258	CASE ( 4 )
	1259	flags => wall_flags_4
	1260	CASE ( 5 )
	1261	flags => wall_flags_5
	1262	CASE ( 6 )
	1263	flags => wall_flags_6
	1264	CASE ( 7 )
	1265	flags => wall_flags_7
	1266	CASE ( 8 )
	1267	flags => wall_flags_8
	1268	CASE ( 9 )
	1269	flags => wall_flags_9
	1270	CASE ( 10 )
	1271	flags => wall_flags_10
	1272	END SELECT
	1273
	1274	!
	1275	!-- Depending on the grid level, set the respective bits in case of
	1276	!-- neighbouring walls
	1277	!-- Bit 0: wall to the bottom
	1278	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1279	!-- Bit 2: wall to the south
	1280	!-- Bit 3: wall to the north
	1281	!-- Bit 4: wall to the left
	1282	!-- Bit 5: wall to the right
[116]	1283	!-- Bit 6: inside building
[114]	1284
	1285	flags = 0
	1286
[927]	1287	!
	1288	!-- In case of masking method, flags are not set and multigrid method
	1289	!-- works like FFT-solver
[1931]	1290	IF ( .NOT. masking_method ) THEN
[927]	1291
[1968]	1292	!
	1293	!-- Allocate temporary array for topography heights on coarser grid
	1294	!-- level. Please note, 2 ghoist points are required, in order to
	1295	!-- calculate flags() on the interior ghost point.
	1296	ALLOCATE( nzb_tmp(nys_l-2:nyn_l+2,nxl_l-2:nxr_l+2) )
	1297	nzb_tmp = 0
	1298
	1299	DO i = nxl_l, nxr_l
	1300	DO j = nys_l, nyn_l
	1301	nzb_tmp(j,i) = nzb_local(jinc,iinc)
	1302	ENDDO
	1303	ENDDO
	1304	!
	1305	!-- Exchange ghost points on respective multigrid level. 2 ghost points
	1306	!-- are required, in order to calculate flags on
	1307	!-- nys_l-1 / nyn_l+1 / nxl_l-1 / nxr_l+1. The alternative would be to
	1308	!-- exchange 3D-INTEGER array flags on the respective multigrid level.
	1309	CALL exchange_horiz_2d_int( nzb_tmp, nys_l, nyn_l, nxl_l, nxr_l, 2 )
	1310	!
	1311	!-- Set non-cyclic boundary conditions on respective multigrid level
	1312	IF ( .NOT. bc_ns_cyc ) THEN
[2021]	1313	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1968]	1314	nzb_tmp(-2,:) = nzb_tmp(0,:)
	1315	nzb_tmp(-1,:) = nzb_tmp(0,:)
	1316	ENDIF
[2021]	1317	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
	1318	nzb_tmp(nyn_l+2,:) = nzb_tmp(nyn_l,:)
	1319	nzb_tmp(nyn_l+1,:) = nzb_tmp(nyn_l,:)
[1968]	1320	ENDIF
	1321	ENDIF
	1322	IF ( .NOT. bc_lr_cyc ) THEN
[2021]	1323	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1968]	1324	nzb_tmp(:,-2) = nzb_tmp(:,0)
	1325	nzb_tmp(:,-1) = nzb_tmp(:,0)
	1326	ENDIF
[2021]	1327	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
	1328	nzb_tmp(:,nxr_l+1) = nzb_tmp(:,nxr_l)
	1329	nzb_tmp(:,nxr_l+2) = nzb_tmp(:,nxr_l)
[1968]	1330	ENDIF
	1331	ENDIF
	1332
[927]	1333	DO i = nxl_l-1, nxr_l+1
	1334	DO j = nys_l-1, nyn_l+1
[1968]	1335	DO k = nzb, nzt_l+1
[114]	1336	!
[927]	1337	!-- Inside/outside building (inside building does not need
	1338	!-- further tests for walls)
[1968]	1339	IF ( k*inc <= nzb_tmp(j,i) ) THEN
[114]	1340
[927]	1341	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1342
[927]	1343	ELSE
[114]	1344	!
[927]	1345	!-- Bottom wall
[1968]	1346	IF ( (k-1)*inc <= nzb_tmp(j,i) ) THEN
[927]	1347	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1348	ENDIF
[114]	1349	!
[927]	1350	!-- South wall
[1968]	1351	IF ( k*inc <= nzb_tmp(j-1,i) ) THEN
[927]	1352	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1353	ENDIF
[114]	1354	!
[927]	1355	!-- North wall
[1968]	1356	IF ( k*inc <= nzb_tmp(j+1,i) ) THEN
[927]	1357	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1358	ENDIF
[114]	1359	!
[927]	1360	!-- Left wall
[1968]	1361	IF ( k*inc <= nzb_tmp(j,i-1) ) THEN
[927]	1362	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1363	ENDIF
[114]	1364	!
[927]	1365	!-- Right wall
[1968]	1366	IF ( k*inc <= nzb_tmp(j,i+1) ) THEN
[927]	1367	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1368	ENDIF
	1369
[114]	1370	ENDIF
	1371
[927]	1372	ENDDO
[114]	1373	ENDDO
	1374	ENDDO
	1375
[1968]	1376	DEALLOCATE( nzb_tmp )
	1377
[927]	1378	ENDIF
	1379
[114]	1380	inc = inc * 2
	1381
	1382	ENDDO
[1968]	1383	!
	1384	!-- Reset grid_level to "normal" grid
	1385	grid_level = 0
	1386
[114]	1387	ENDIF
[861]	1388	!
[1942]	1389	!-- Allocate flags needed for masking walls. Even though these flags are only
[2021]	1390	!-- required in the ws-scheme, the arrays need to be allocated here as they are
[1942]	1391	!-- used in OpenACC directives.
[1677]	1392	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1393	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1394	wall_flags_0 = 0
	1395	wall_flags_00 = 0
[114]	1396	!
[2021]	1397	!-- Init flags for ws-scheme to degrade order of the numerics near walls, i.e.
	1398	!-- to decrease the numerical stencil appropriately.
[1942]	1399	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' .OR.&
	1400	scalar_advec == 'ws-scheme-mono' ) THEN
	1401	CALL ws_init_flags
[861]	1402	ENDIF
	1403
	1404	!
[1]	1405	!-- In case of topography: limit near-wall mixing length l_wall further:
	1406	!-- Go through all points of the subdomain one by one and look for the closest
	1407	!-- surface
	1408	IF ( TRIM(topography) /= 'flat' ) THEN
	1409	DO i = nxl, nxr
	1410	DO j = nys, nyn
	1411
	1412	nzb_si = nzb_s_inner(j,i)
	1413	vi = vertical_influence(nzb_si)
	1414
	1415	IF ( wall_n(j,i) > 0 ) THEN
	1416	!
	1417	!-- North wall (y distance)
	1418	DO k = wall_n(j,i), nzb_si
[1353]	1419	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1420	ENDDO
	1421	!
	1422	!-- Above North wall (yz distance)
	1423	DO k = nzb_si + 1, nzb_si + vi
[1353]	1424	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1425	SQRT( 0.25_wp * dy**2 + &
[1]	1426	( zu(k) - zw(nzb_si) )**2 ) )
	1427	ENDDO
	1428	!
	1429	!-- Northleft corner (xy distance)
	1430	IF ( corner_nl(j,i) > 0 ) THEN
	1431	DO k = corner_nl(j,i), nzb_si
	1432	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1433	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1434	ENDDO
	1435	!
	1436	!-- Above Northleft corner (xyz distance)
	1437	DO k = nzb_si + 1, nzb_si + vi
[1353]	1438	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1439	SQRT( 0.25_wp * (dx2 + dy2) + &
	1440	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1441	ENDDO
	1442	ENDIF
	1443	!
	1444	!-- Northright corner (xy distance)
	1445	IF ( corner_nr(j,i) > 0 ) THEN
	1446	DO k = corner_nr(j,i), nzb_si
[1353]	1447	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1448	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1449	ENDDO
	1450	!
	1451	!-- Above northright corner (xyz distance)
	1452	DO k = nzb_si + 1, nzb_si + vi
[1353]	1453	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1454	SQRT( 0.25_wp * (dx2 + dy2) + &
	1455	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1456	ENDDO
	1457	ENDIF
	1458	ENDIF
	1459
	1460	IF ( wall_s(j,i) > 0 ) THEN
	1461	!
	1462	!-- South wall (y distance)
	1463	DO k = wall_s(j,i), nzb_si
[1353]	1464	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1465	ENDDO
	1466	!
	1467	!-- Above south wall (yz distance)
[1353]	1468	DO k = nzb_si + 1, nzb_si + vi
	1469	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1470	SQRT( 0.25_wp * dy**2 + &
[1]	1471	( zu(k) - zw(nzb_si) )**2 ) )
	1472	ENDDO
	1473	!
	1474	!-- Southleft corner (xy distance)
	1475	IF ( corner_sl(j,i) > 0 ) THEN
	1476	DO k = corner_sl(j,i), nzb_si
[1353]	1477	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1478	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1479	ENDDO
	1480	!
	1481	!-- Above southleft corner (xyz distance)
	1482	DO k = nzb_si + 1, nzb_si + vi
[1353]	1483	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1484	SQRT( 0.25_wp * (dx2 + dy2) + &
	1485	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1486	ENDDO
	1487	ENDIF
	1488	!
	1489	!-- Southright corner (xy distance)
	1490	IF ( corner_sr(j,i) > 0 ) THEN
	1491	DO k = corner_sr(j,i), nzb_si
[1353]	1492	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1493	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1494	ENDDO
	1495	!
	1496	!-- Above southright corner (xyz distance)
	1497	DO k = nzb_si + 1, nzb_si + vi
[1353]	1498	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1499	SQRT( 0.25_wp * (dx2 + dy2) + &
	1500	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1501	ENDDO
	1502	ENDIF
	1503
	1504	ENDIF
	1505
	1506	IF ( wall_l(j,i) > 0 ) THEN
	1507	!
	1508	!-- Left wall (x distance)
	1509	DO k = wall_l(j,i), nzb_si
[1353]	1510	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1511	ENDDO
	1512	!
	1513	!-- Above left wall (xz distance)
	1514	DO k = nzb_si + 1, nzb_si + vi
[1353]	1515	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1516	SQRT( 0.25_wp * dx**2 + &
	1517	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1518	ENDDO
	1519	ENDIF
	1520
	1521	IF ( wall_r(j,i) > 0 ) THEN
	1522	!
	1523	!-- Right wall (x distance)
	1524	DO k = wall_r(j,i), nzb_si
[1353]	1525	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1526	ENDDO
	1527	!
	1528	!-- Above right wall (xz distance)
	1529	DO k = nzb_si + 1, nzb_si + vi
[1353]	1530	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1531	SQRT( 0.25_wp * dx**2 + &
[1]	1532	( zu(k) - zw(nzb_si) )**2 ) )
	1533	ENDDO
	1534
	1535	ENDIF
	1536
	1537	ENDDO
	1538	ENDDO
	1539
	1540	ENDIF
	1541
	1542	!
	1543	!-- Multiplication with wall_adjustment_factor
	1544	l_wall = wall_adjustment_factor * l_wall
	1545
	1546	!
[709]	1547	!-- Set lateral boundary conditions for l_wall
[667]	1548	CALL exchange_horiz( l_wall, nbgp )
	1549
[1]	1550	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
[1968]	1551	vertical_influence, wall_l, wall_n, wall_r, wall_s )
[1]	1552
	1553
	1554	END SUBROUTINE init_grid

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