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source: palm/trunk/SOURCE/init_grid.f90 @ 2185

Last change on this file since 2185 was 2170, checked in by suehring, 8 years ago
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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	!
[2101]	17	! Copyright 1997-2017 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[1969]	22	!
[2170]	23	!
[1969]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 2170 2017-03-06 18:17:40Z raasch $
	27	!
[2170]	28	! 2169 2017-03-06 18:16:35Z suehring
	29	! Bugfix, move setting for topography grid convention to init_grid, else, if no
	30	! value is set, the simulation may abort in case of restarts
	31	!
[2129]	32	! 2128 2017-01-23 15:00:03Z suehring
	33	! Bugfix in setting topography from file in case of ocean simulations
	34	!
[2089]	35	! 2088 2016-12-19 16:30:25Z suehring
	36	! Bugfix in generic topography in case of ocean simulations
	37	!
[2038]	38	! 2037 2016-10-26 11:15:40Z knoop
	39	! Anelastic approximation implemented
	40	!
[2022]	41	! 2021 2016-10-07 14:08:57Z suehring
	42	! Bugfix: setting Neumann boundary conditions for topography required for
	43	! topography flags in multigrid_noopt solver
	44	!
[2001]	45	! 2000 2016-08-20 18:09:15Z knoop
	46	! Forced header and separation lines into 80 columns
	47	!
[1995]	48	! 1994 2016-08-15 09:52:21Z suehring
	49	! Bugfix in definition of generic topography
	50	!
[1983]	51	! 1982 2016-08-01 11:04:48Z suehring
	52	! Bugfix concering consistency check for topography
	53	!
[1969]	54	! 1968 2016-07-18 12:01:49Z suehring
[1968]	55	! Changed: PE-wise reading of topography file in order to avoid global definition
	56	! of arrays nzb_local and nzb_tmp. Thereby, topography definition for single
	57	! buildings and street canyons has changed, as well as flag setting for
	58	! multigrid scheme.
	59	!
	60	! Bugfix in checking l_grid anisotropy.
	61	! Simplify initial computation of lwall and vertical_influence, i.e. remove
	62	! nzb_s_inner as it is still zero at this point.
[1932]	63	!
[1943]	64	! 1942 2016-06-14 12:18:18Z suehring
	65	! Topography filter implemented to fill holes resolved by only one grid point.
	66	! Initialization of flags for ws-scheme moved to advec_ws.
	67	!
[1932]	68	! 1931 2016-06-10 12:06:59Z suehring
	69	! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid
	70	!
[1911]	71	! 1910 2016-05-26 06:49:46Z raasch
	72	! Bugfix: if topography is read from file, Neumann conditions are used for the
	73	! nzb_local array (instead of cyclic conditions) in case that non-cyclic
	74	! boundary conditions are switched on for the run
	75	!
[1903]	76	! 1902 2016-05-09 11:18:56Z suehring
[1910]	77	! Set topography flags for multigrid solver only (not for multigrid_fast)
[1903]	78	!
[1887]	79	! 1886 2016-04-21 11:20:47Z suehring
	80	! Bugfix: setting advection flags near walls
	81	! reformulated index values for nzb_v_inner
	82	! variable discriptions added in declaration block
	83	!
[1846]	84	! 1845 2016-04-08 08:29:13Z raasch
	85	! nzb_2d removed
	86	!
[1805]	87	! 1804 2016-04-05 16:30:18Z maronga
	88	! Removed code for parameter file check (__check)
	89	!
[1780]	90	! 1779 2016-03-03 08:01:28Z raasch
	91	! coupling_char is trimmed at every place it occurs, because it can have
	92	! different length now
	93	!
[1763]	94	! 1762 2016-02-25 12:31:13Z hellstea
	95	! Introduction of nested domain feature
	96	!
[1744]	97	! 1743 2016-01-13 10:23:51Z raasch
	98	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	99	! total domain
	100	!
[1692]	101	! 1691 2015-10-26 16:17:44Z maronga
	102	! Renamed prandtl_layer to constant_flux_layer.
	103	!
[1683]	104	! 1682 2015-10-07 23:56:08Z knoop
	105	! Code annotations made doxygen readable
	106	!
[1678]	107	! 1677 2015-10-02 13:25:23Z boeske
	108	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	109	!
[1676]	110	! 1675 2015-10-02 08:28:59Z gronemeier
	111	! Bugfix: Definition of topography grid levels
	112	!
[1662]	113	! 1660 2015-09-21 08:15:16Z gronemeier
	114	! Bugfix: Definition of topography grid levels if vertical grid stretching
	115	! starts below the maximum topography height.
	116	!
[1581]	117	! 1580 2015-04-10 13:43:49Z suehring
	118	! Bugfix: setting flags for 5th order scheme near buildings
	119	!
[1576]	120	! 1575 2015-03-27 09:56:27Z raasch
	121	! adjustments for psolver-queries
	122	!
[1558]	123	! 1557 2015-03-05 16:43:04Z suehring
	124	! Adjustment for monotoinic limiter
	125	!
[1419]	126	! 1418 2014-06-06 13:05:08Z fricke
	127	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	128	! condition and a negative value for dz_stretch_level the condition
	129	! was always true for the whole model domain
	130	!
[1410]	131	! 1409 2014-05-23 12:11:32Z suehring
	132	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	133	! j <= nysv
	134	!
[1354]	135	! 1353 2014-04-08 15:21:23Z heinze
	136	! REAL constants provided with KIND-attribute
	137	!
[1323]	138	! 1322 2014-03-20 16:38:49Z raasch
	139	! REAL constants defined as wp-kind
	140	!
[1321]	141	! 1320 2014-03-20 08:40:49Z raasch
[1320]	142	! ONLY-attribute added to USE-statements,
	143	! kind-parameters added to all INTEGER and REAL declaration statements,
	144	! kinds are defined in new module kinds,
	145	! revision history before 2012 removed,
	146	! comment fields (!:) to be used for variable explanations added to
	147	! all variable declaration statements
[1321]	148	!
[1222]	149	! 1221 2013-09-10 08:59:13Z raasch
	150	! wall_flags_00 introduced to hold bits 32-63,
	151	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	152	! loops optimized for openACC (pres + flow_statistics)
	153	!
[1093]	154	! 1092 2013-02-02 11:24:22Z raasch
	155	! unused variables removed
	156	!
[1070]	157	! 1069 2012-11-28 16:18:43Z maronga
[1779]	158	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	159	! ocean model in case of coupled runs
[1070]	160	!
[1037]	161	! 1036 2012-10-22 13:43:42Z raasch
	162	! code put under GPL (PALM 3.9)
	163	!
[1017]	164	! 1015 2012-09-27 09:23:24Z raasch
	165	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	166	! nzb_w_inner+1
	167	!
[997]	168	! 996 2012-09-07 10:41:47Z raasch
	169	! little reformatting
	170	!
[979]	171	! 978 2012-08-09 08:28:32Z fricke
	172	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	173	! Bugfix: Set wall_flags_0 for inflow boundary
	174	!
[928]	175	! 927 2012-06-06 19:15:04Z raasch
	176	! Wall flags are not set for multigrid method in case of masking method
	177	!
[865]	178	! 864 2012-03-27 15:10:33Z gryschka
[927]	179	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	180	! were not correctly defined for k=1.
[865]	181	!
[863]	182	! 861 2012-03-26 14:18:34Z suehring
[861]	183	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	184	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	185	! model domain.!
[861]	186	! Initialization of nzb_s_inner and nzb_w_inner.
	187	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	188	! while setting wall_flags_0
	189	!
[844]	190	! 843 2012-02-29 15:16:21Z gryschka
	191	! In case of ocean and dirichlet bc for u and v at the bottom
	192	! the first u-level ist defined at same height as the first w-level
	193	!
[819]	194	! 818 2012-02-08 16:11:23Z maronga
	195	! Bugfix: topo_height is only required if topography is used. It is thus now
	196	! allocated in the topography branch
	197	!
[810]	198	! 809 2012-01-30 13:32:58Z maronga
	199	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	200	!
[808]	201	! 807 2012-01-25 11:53:51Z maronga
	202	! New cpp directive "__check" implemented which is used by check_namelist_files
	203	!
[1]	204	! Revision 1.1 1997/08/11 06:17:45 raasch
	205	! Initial revision (Testversion)
	206	!
	207	!
	208	! Description:
	209	! ------------
[1682]	210	!> Creating grid depending constants
[1]	211	!------------------------------------------------------------------------------!
[1682]	212	SUBROUTINE init_grid
	213
[1942]	214	USE advec_ws, &
	215	ONLY: ws_init_flags
[1]	216
[1320]	217	USE arrays_3d, &
	218	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	219	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	220
[1353]	221	USE control_parameters, &
[1910]	222	ONLY: bc_lr_cyc, bc_ns_cyc, building_height, building_length_x, &
[1320]	223	building_length_y, building_wall_left, building_wall_south, &
	224	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	225	canyon_width_x, canyon_width_y, constant_flux_layer, &
	226	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
[1968]	227	dz_stretch_level, dz_stretch_level_index, grid_level, ibc_uv_b, &
	228	io_blocks, io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
[1691]	229	masking_method, maximum_grid_level, message_string, &
[2021]	230	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	231	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
[1762]	232	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	233	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
[2021]	234	wall_adjustment_factor
	235
[1320]	236	USE grid_variables, &
[2037]	237	ONLY: ddx, ddx2, ddy, ddy2, dx, dx2, dy, dy2, fwxm, &
[1320]	238	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	239	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	240
	241	USE indices, &
[1942]	242	ONLY: flags, nbgp, nx, nxl, nxlg, nxl_mg, nxr, nxrg, nxr_mg, &
	243	ny, nyn, nyng, nyn_mg, nys, nys_mg, nysg, nz, nzb, &
[1845]	244	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
	245	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
	246	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
	247	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
[1320]	248	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	249	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	250	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	251	wall_flags_9
	252
	253	USE kinds
	254
[1]	255	USE pegrid
	256
	257	IMPLICIT NONE
	258
[1968]	259	INTEGER(iwp) :: bh !< temporary vertical index of building height
	260	INTEGER(iwp) :: blx !< grid point number of building size along x
	261	INTEGER(iwp) :: bly !< grid point number of building size along y
	262	INTEGER(iwp) :: bxl !< index for left building wall
	263	INTEGER(iwp) :: bxr !< index for right building wall
	264	INTEGER(iwp) :: byn !< index for north building wall
	265	INTEGER(iwp) :: bys !< index for south building wall
	266	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
	267	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
	268	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
	269	INTEGER(iwp) :: cxl !< index for left canyon wall
	270	INTEGER(iwp) :: cxr !< index for right canyon wall
	271	INTEGER(iwp) :: cyn !< index for north canyon wall
	272	INTEGER(iwp) :: cys !< index for south canyon wall
	273	INTEGER(iwp) :: i !< index variable along x
	274	INTEGER(iwp) :: ii !< loop variable for reading topography file
	275	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
	276	INTEGER(iwp) :: j !< index variable along y
	277	INTEGER(iwp) :: k !< index variable along z
	278	INTEGER(iwp) :: l !< loop variable
	279	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
	280	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
	281	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
	282	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
	283	INTEGER(iwp) :: nzb_local_max !< vertical grid index of maximum topography height
	284	INTEGER(iwp) :: nzb_local_min !< vertical grid index of minimum topography height
	285	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
	286	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
	287	INTEGER(iwp) :: num_hole !< number of holes (in topography) resolved by only one grid point
	288	INTEGER(iwp) :: num_hole_l !< number of holes (in topography) resolved by only one grid point on local PE
	289	INTEGER(iwp) :: num_wall !< number of surrounding vertical walls for a single grid point
	290	INTEGER(iwp) :: skip_n_rows !< counting variable to skip rows while reading topography file
	291	INTEGER(iwp) :: vi !< dummy for vertical influence
[1]	292
[1886]	293	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
[1931]	294	vertical_influence !< number of vertical grid points above obstacle where adjustment of near-wall mixing length is required
[1886]	295
[1968]	296	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of north-left corner location to limit near-wall mixing length
	297	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
	298	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
	299	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
	300	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography top at cell-center
	301	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate topography indices on u- and v-grid
	302	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to adjacent left-facing wall
	303	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
	304	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
	305	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
[1]	306
[1968]	307	REAL(wp) :: dum !< dummy variable to skip columns while reading topography file
[1886]	308	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
[861]	309
[1968]	310	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for topography height
	311	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zu_s_inner_l !< dummy array on global scale to write topography output array
	312	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zw_w_inner_l !< dummy array on global scale to write topography output array
[1]	313
[667]	314
[1]	315	!
[709]	316	!-- Calculation of horizontal array bounds including ghost layers
[667]	317	nxlg = nxl - nbgp
	318	nxrg = nxr + nbgp
	319	nysg = nys - nbgp
	320	nyng = nyn + nbgp
[709]	321
[667]	322	!
[1]	323	!-- Allocate grid arrays
[1353]	324	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	325	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	326
	327	!
	328	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	329	IF ( dz == -1.0_wp ) THEN
[254]	330	message_string = 'missing dz'
	331	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	332	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	333	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	334	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	335	ENDIF
[94]	336
[1]	337	!
[94]	338	!-- Define the vertical grid levels
	339	IF ( .NOT. ocean ) THEN
	340	!
	341	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	342	!-- The second u-level (k=1) corresponds to the top of the
[94]	343	!-- Prandtl-layer.
[667]	344
	345	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	346	zu(0) = 0.0_wp
	347	! zu(0) = - dz * 0.5_wp
[667]	348	ELSE
[1353]	349	zu(0) = - dz * 0.5_wp
[667]	350	ENDIF
[1353]	351	zu(1) = dz * 0.5_wp
[1]	352
[94]	353	dz_stretch_level_index = nzt+1
	354	dz_stretched = dz
	355	DO k = 2, nzt+1
	356	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	357	dz_stretched = dz_stretched * dz_stretch_factor
	358	dz_stretched = MIN( dz_stretched, dz_max )
	359	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	360	ENDIF
	361	zu(k) = zu(k-1) + dz_stretched
	362	ENDDO
[1]	363
	364	!
[94]	365	!-- Compute the w-levels. They are always staggered half-way between the
[843]	366	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	367	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	368	!-- The top w-level is extrapolated linearly.
[1353]	369	zw(0) = 0.0_wp
[94]	370	DO k = 1, nzt
[1353]	371	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	372	ENDDO
[1353]	373	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	374
[94]	375	ELSE
[1]	376	!
[843]	377	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	378	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	379	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	380	!-- w-level are defined at same height, but staggered from the second level.
	381	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	382	zu(nzt+1) = dz * 0.5_wp
	383	zu(nzt) = - dz * 0.5_wp
[94]	384
	385	dz_stretch_level_index = 0
	386	dz_stretched = dz
	387	DO k = nzt-1, 0, -1
[1418]	388	!
	389	!-- The default value of dz_stretch_level is positive, thus the first
	390	!-- condition is always true. Hence, the second condition is necessary.
	391	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	392	.AND. dz_stretched < dz_max ) THEN
[94]	393	dz_stretched = dz_stretched * dz_stretch_factor
	394	dz_stretched = MIN( dz_stretched, dz_max )
	395	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	396	ENDIF
	397	zu(k) = zu(k+1) - dz_stretched
	398	ENDDO
	399
	400	!
	401	!-- Compute the w-levels. They are always staggered half-way between the
[843]	402	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	403	!-- at the ground. In this case the first u- and w-level are defined at
	404	!-- same height. The top w-level (nzt+1) is not used but set for
	405	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	406	zw(nzt+1) = dz
[1353]	407	zw(nzt) = 0.0_wp
[94]	408	DO k = 0, nzt
[1353]	409	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	410	ENDDO
	411
[843]	412	!
	413	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	414	!-- at same height.
	415	IF ( ibc_uv_b == 0 ) THEN
	416	zu(0) = zw(0)
	417	ENDIF
	418
[94]	419	ENDIF
	420
	421	!
[1]	422	!-- Compute grid lengths.
	423	DO k = 1, nzt+1
	424	dzu(k) = zu(k) - zu(k-1)
[1353]	425	ddzu(k) = 1.0_wp / dzu(k)
[1]	426	dzw(k) = zw(k) - zw(k-1)
[1353]	427	ddzw(k) = 1.0_wp / dzw(k)
[1]	428	ENDDO
	429
	430	DO k = 1, nzt
[1353]	431	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	432	ENDDO
[667]	433
	434	!
[709]	435	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	436	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	437	!-- is only dz/2, but should be dz. Therefore, an additional array
	438	!-- containing with appropriate grid information is created for these
	439	!-- solvers.
[1575]	440	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	441	ALLOCATE( ddzu_pres(1:nzt+1) )
	442	ddzu_pres = ddzu
[864]	443	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[1]	444	ENDIF
	445
	446	!
	447	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	448	ddx = 1.0_wp / dx
	449	ddy = 1.0_wp / dy
[1]	450	dx2 = dx * dx
	451	dy2 = dy * dy
[1353]	452	ddx2 = 1.0_wp / dx2
	453	ddy2 = 1.0_wp / dy2
[1]	454
	455	!
	456	!-- Compute the grid-dependent mixing length.
	457	DO k = 1, nzt
[1322]	458	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	459	ENDDO
	460
	461	!
	462	!-- Allocate outer and inner index arrays for topography and set
[114]	463	!-- defaults.
[667]	464
[114]	465	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	466	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
	467	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1968]	468	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
	469
[667]	470	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	471	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	472	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	473	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	474	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	475	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	476	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	477	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	478	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	479	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	480	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	481	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	482	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	483	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	484	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	485	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
[1968]	486	nzb_local(nysg:nyng,nxlg:nxrg), &
	487	nzb_tmp(nysg:nyng,nxlg:nxrg), &
[1221]	488	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	489	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	490	wall_e_x(nysg:nyng,nxlg:nxrg), &
	491	wall_e_y(nysg:nyng,nxlg:nxrg), &
	492	wall_u(nysg:nyng,nxlg:nxrg), &
	493	wall_v(nysg:nyng,nxlg:nxrg), &
	494	wall_w_x(nysg:nyng,nxlg:nxrg), &
	495	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	496
	497
[667]	498
	499	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	500
[818]	501
[1]	502	nzb_s_inner = nzb; nzb_s_outer = nzb
	503	nzb_u_inner = nzb; nzb_u_outer = nzb
	504	nzb_v_inner = nzb; nzb_v_outer = nzb
	505	nzb_w_inner = nzb; nzb_w_outer = nzb
	506
[1353]	507	rflags_s_inner = 1.0_wp
	508	rflags_invers = 1.0_wp
[1221]	509
[1]	510	!
[19]	511	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	512	!-- form (which does not use surface fluxes) is applied
[1691]	513	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	514	nzb_diff = nzb + 2
	515	ELSE
	516	nzb_diff = nzb + 1
	517	ENDIF
[19]	518	IF ( use_top_fluxes ) THEN
	519	nzt_diff = nzt - 1
	520	ELSE
	521	nzt_diff = nzt
	522	ENDIF
[1]	523
	524	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	525	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	526
[1353]	527	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	528	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	529	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	530	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	531
	532	!
	533	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	534	!-- for the moment,
	535	!-- multiplication with wall_adjustment_factor near the end of this routine
	536	l_wall(nzb,:,:) = l_grid(1)
	537	DO k = nzb+1, nzt
	538	l_wall(k,:,:) = l_grid(k)
	539	ENDDO
	540	l_wall(nzt+1,:,:) = l_grid(nzt)
	541
	542	ALLOCATE ( vertical_influence(nzb:nzt) )
	543	DO k = 1, nzt
	544	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	545	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	546	ENDDO
	547
[1968]	548	DO k = 1, nzt
[1353]	549	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	550	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	551	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	552	'threshold given by only local', &
	553	' &horizontal reduction of near_wall ', &
	554	'mixing length l_wall', &
	555	' &starting from height level k = ', k, '.'
	556	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	557	EXIT
	558	ENDIF
	559	ENDDO
	560	vertical_influence(0) = vertical_influence(1)
	561
[1968]	562	DO k = nzb + 1, nzb + vertical_influence(nzb)
	563	l_wall(k,:,:) = zu(k) - zw(nzb)
[1]	564	ENDDO
	565
	566	!
	567	!-- Set outer and inner index arrays for non-flat topography.
	568	!-- Here consistency checks concerning domain size and periodicity are
	569	!-- necessary.
	570	!-- Within this SELECT CASE structure only nzb_local is initialized
	571	!-- individually depending on the chosen topography type, all other index
	572	!-- arrays are initialized further below.
	573	SELECT CASE ( TRIM( topography ) )
	574
	575	CASE ( 'flat' )
	576	!
[555]	577	!-- nzb_local is required for the multigrid solver
	578	nzb_local = 0
[1]	579
	580	CASE ( 'single_building' )
	581	!
	582	!-- Single rectangular building, by default centered in the middle of the
	583	!-- total domain
	584	blx = NINT( building_length_x / dx )
	585	bly = NINT( building_length_y / dy )
[2088]	586	IF ( .NOT. ocean ) THEN
	587	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	588	ELSE
	589	bh = MINLOC( ABS( zw - zw(0) - building_height ), 1 ) - 1
	590	ENDIF
	591
[1675]	592	IF ( ABS( zw(bh ) - building_height ) == &
	593	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	594
[1322]	595	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	596	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	597	ENDIF
	598	bxl = NINT( building_wall_left / dx )
	599	bxr = bxl + blx
	600
[1322]	601	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	602	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	603	ENDIF
	604	bys = NINT( building_wall_south / dy )
	605	byn = bys + bly
	606
	607	!
	608	!-- Building size has to meet some requirements
	609	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	610	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	611	WRITE( message_string, * ) 'inconsistent building parameters:', &
	612	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	613	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	614	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	615	ENDIF
	616
	617	!
[1968]	618	!-- Define the building.
[1]	619	nzb_local = 0
[1968]	620	IF ( bxl <= nxr .AND. bxr >= nxl .AND. &
	621	bys <= nyn .AND. byn >= nys ) &
	622	nzb_local(MAX(nys,bys):MIN(nyn,byn),MAX(nxl,bxl):MIN(nxr,bxr)) = bh
[1]	623
[1994]	624	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	625
[240]	626	CASE ( 'single_street_canyon' )
	627	!
	628	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	629	!-- The canyon is centered in the other direction by default.
[1322]	630	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	631	!
	632	!-- Street canyon in y direction
	633	cwx = NINT( canyon_width_x / dx )
[1322]	634	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	635	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	636	ENDIF
	637	cxl = NINT( canyon_wall_left / dx )
	638	cxr = cxl + cwx
	639
[1322]	640	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	641	!
	642	!-- Street canyon in x direction
	643	cwy = NINT( canyon_width_y / dy )
[1322]	644	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	645	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	646	ENDIF
	647	cys = NINT( canyon_wall_south / dy )
	648	cyn = cys + cwy
	649
	650	ELSE
[254]	651
	652	message_string = 'no street canyon width given'
	653	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	654
[240]	655	ENDIF
	656
[2088]	657	IF ( .NOT. ocean ) THEN
	658	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	659	ELSE
	660	ch = MINLOC( ABS( zw - zw(0) - canyon_height ), 1 ) - 1
	661	ENDIF
	662
[1675]	663	IF ( ABS( zw(ch ) - canyon_height ) == &
	664	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	665
[240]	666	dp_level_ind_b = ch
	667	!
	668	!-- Street canyon size has to meet some requirements
[1322]	669	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	670	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	671	( ch < 3 ) ) THEN
[1353]	672	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	673	'&cxl=', cxl, 'cxr=', cxr, &
	674	'cwx=', cwx, &
[254]	675	'ch=', ch, 'nx=', nx, 'ny=', ny
	676	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	677	ENDIF
[1322]	678	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	679	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	680	( ch < 3 ) ) THEN
[1353]	681	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	682	'&cys=', cys, 'cyn=', cyn, &
	683	'cwy=', cwy, &
[254]	684	'ch=', ch, 'nx=', nx, 'ny=', ny
	685	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	686	ENDIF
	687	ENDIF
[1353]	688	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	689	canyon_width_y /= 9999999.9_wp ) THEN
	690	message_string = 'inconsistent canyon parameters:' // &
	691	'&street canyon can only be oriented' // &
[254]	692	'&either in x- or in y-direction'
	693	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	694	ENDIF
	695
	696	nzb_local = ch
[1322]	697	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1968]	698	IF ( cxl <= nxr .AND. cxr >= nxl ) &
	699	nzb_local(:,MAX(nxl,cxl+1):MIN(nxr,cxr-1)) = 0
[1322]	700	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1968]	701	IF ( cys <= nyn .AND. cyn >= nys ) &
	702	nzb_local(MAX(nys,cys+1):MIN(nyn,cyn-1),:) = 0
[240]	703	ENDIF
	704
[1994]	705	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	706
[1]	707	CASE ( 'read_from_file' )
[759]	708
[1968]	709	ALLOCATE ( topo_height(nys:nyn,nxl:nxr) )
[818]	710
[759]	711	DO ii = 0, io_blocks-1
	712	IF ( ii == io_group ) THEN
	713
[1]	714	!
[759]	715	!-- Arbitrary irregular topography data in PALM format (exactly
	716	!-- matching the grid size and total domain size)
[1779]	717	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	718	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[1968]	719	!
	720	!-- Read topography PE-wise. Rows are read from nyn to nys, columns
	721	!-- are read from nxl to nxr. At first, ny-nyn rows need to be skipped.
	722	skip_n_rows = 0
	723	DO WHILE ( skip_n_rows < ny - nyn )
	724	READ( 90, * )
	725	skip_n_rows = skip_n_rows + 1
[759]	726	ENDDO
[1968]	727	!
	728	!-- Read data from nyn to nys and nxl to nxr. Therefore, skip
	729	!-- column until nxl-1 is reached
	730	DO j = nyn, nys, -1
	731	READ( 90, *, ERR=11, END=11 ) &
	732	( dum, i = 0, nxl-1 ), &
	733	( topo_height(j,i), i = nxl, nxr )
	734	ENDDO
[759]	735
	736	GOTO 12
	737
[1779]	738	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	739	' does not exist'
[759]	740	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	741
[1779]	742	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	743	TRIM( coupling_char )
[759]	744	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	745
	746	12 CLOSE( 90 )
	747
	748	ENDIF
[1804]	749	#if defined( __parallel )
[759]	750	CALL MPI_BARRIER( comm2d, ierr )
	751	#endif
[559]	752	ENDDO
[759]	753
[1]	754	!
	755	!-- Calculate the index height of the topography
[1968]	756	nzb_local = 0
	757	DO i = nxl, nxr
	758	DO j = nys, nyn
[2128]	759	IF ( .NOT. ocean ) THEN
	760	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	761	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	762	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	763	nzb_local(j,i) = nzb_local(j,i) + 1
	764	ELSE
	765	nzb_local(j,i) = MINLOC( ABS( zw - zw(0) &
	766	- topo_height(j,i) ), 1 ) - 1
	767	IF ( ABS( zw(nzb_local(j,i) ) - zw(0) &
	768	- topo_height(j,i) ) == &
	769	ABS( zw(nzb_local(j,i)+1) - zw(0) &
	770	- topo_height(j,i) ) ) &
	771	nzb_local(j,i) = nzb_local(j,i) + 1
	772	ENDIF
	773
[1]	774	ENDDO
	775	ENDDO
[818]	776
	777	DEALLOCATE ( topo_height )
[1942]	778	!
	779	!-- Filter topography, i.e. fill holes resolved by only one grid point.
	780	!-- Such holes are suspected to lead to velocity blow-ups as continuity
	781	!-- equation on discrete grid cannot be fulfilled in such case.
	782	!-- For now, check only for holes and fill them to the lowest height level
	783	!-- of the directly adjoining grid points along x- and y- direction.
	784	!-- Before checking for holes, set lateral boundary conditions for
	785	!-- topography. After hole-filling, boundary conditions must be set again!
[1968]	786	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	787
	788	IF ( .NOT. bc_ns_cyc ) THEN
	789	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
	790	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
[1942]	791	ENDIF
[1910]	792
[1968]	793	IF ( .NOT. bc_lr_cyc ) THEN
	794	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
	795	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
[1942]	796	ENDIF
	797
[1968]	798	num_hole_l = 0
	799	DO i = nxl, nxr
	800	DO j = nys, nyn
[1942]	801
	802	num_wall = 0
	803
	804	IF ( nzb_local(j-1,i) > nzb_local(j,i) ) &
	805	num_wall = num_wall + 1
	806	IF ( nzb_local(j+1,i) > nzb_local(j,i) ) &
	807	num_wall = num_wall + 1
	808	IF ( nzb_local(j,i-1) > nzb_local(j,i) ) &
	809	num_wall = num_wall + 1
	810	IF ( nzb_local(j,i+1) > nzb_local(j,i) ) &
	811	num_wall = num_wall + 1
	812
	813	IF ( num_wall == 4 ) THEN
	814	nzb_local(j,i) = MIN( nzb_local(j-1,i), nzb_local(j+1,i), &
	815	nzb_local(j,i-1), nzb_local(j,i+1) )
[1968]	816	num_hole_l = num_hole_l + 1
[1942]	817	ENDIF
	818	ENDDO
	819	ENDDO
[114]	820	!
[1968]	821	!-- Count the total number of holes, required for informative message.
	822	#if defined( __parallel )
	823	CALL MPI_ALLREDUCE( num_hole_l, num_hole, 1, MPI_INTEGER, MPI_SUM, &
	824	comm2d, ierr )
	825	#else
	826	num_hole = num_hole_l
	827	#endif
	828	!
[1942]	829	!-- Create an informative message if any hole was removed.
[1968]	830	IF ( num_hole > 0 ) THEN
[1942]	831	WRITE( message_string, * ) num_hole, 'hole(s) resolved by only '//&
	832	'one grid point were filled'
	833	CALL message( 'init_grid', 'PA0430', 0, 0, 0, 6, 0 )
	834	ENDIF
	835	!
[1968]	836	!-- Exchange ghost-points, as well as add cyclic or Neumann boundary
	837	!-- conditions.
	838	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	839
	840	IF ( .NOT. bc_ns_cyc ) THEN
	841	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
	842	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
[1910]	843	ENDIF
[667]	844
[1968]	845	IF ( .NOT. bc_lr_cyc ) THEN
	846	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
	847	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
[1910]	848	ENDIF
	849
[1]	850	CASE DEFAULT
	851	!
	852	!-- The DEFAULT case is reached either if the parameter topography
[217]	853	!-- contains a wrong character string or if the user has defined a special
[1]	854	!-- case in the user interface. There, the subroutine user_init_grid
	855	!-- checks which of these two conditions applies.
[1968]	856	CALL user_init_grid( nzb_local )
[1]	857
	858	END SELECT
	859	!
[861]	860	!-- Determine the maximum level of topography. Furthermore it is used for
	861	!-- steering the degradation of order of the applied advection scheme.
[978]	862	!-- In case of non-cyclic lateral boundaries, the order of the advection
[1968]	863	!-- scheme has to be reduced up to nzt (required at the lateral boundaries).
	864	#if defined( __parallel )
	865	CALL MPI_ALLREDUCE( MAXVAL( nzb_local ) + 1, nzb_max, 1, MPI_INTEGER, &
	866	MPI_MAX, comm2d, ierr )
	867	#else
[1677]	868	nzb_max = MAXVAL( nzb_local ) + 1
[1968]	869	#endif
[1353]	870	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	871	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	872	nest_domain ) &
	873	THEN
	874	nzb_max = nzt
[978]	875	ENDIF
	876
[861]	877	!
[1]	878	!-- Consistency checks and index array initialization are only required for
[217]	879	!-- non-flat topography, also the initialization of topography height arrays
[49]	880	!-- zu_s_inner and zw_w_inner
[1]	881	IF ( TRIM( topography ) /= 'flat' ) THEN
[1968]	882	#if defined( __parallel )
	883	CALL MPI_ALLREDUCE( MAXVAL( nzb_local ), nzb_local_max, 1, MPI_INTEGER, &
	884	MPI_MAX, comm2d, ierr )
[1982]	885	CALL MPI_ALLREDUCE( MINVAL( nzb_local ), nzb_local_min, 1, MPI_INTEGER, &
[1968]	886	MPI_MIN, comm2d, ierr )
	887	#else
	888	nzb_local_max = MAXVAL( nzb_local )
	889	nzb_local_min = MINVAL( nzb_local )
	890	#endif
[1982]	891
[1]	892	!
	893	!-- Consistency checks
[1968]	894	IF ( nzb_local_min < 0 .OR. nzb_local_max > nz + 1 ) THEN
[1353]	895	WRITE( message_string, * ) 'nzb_local values are outside the', &
	896	'model domain', &
[1968]	897	'&MINVAL( nzb_local ) = ', nzb_local_min, &
	898	'&MAXVAL( nzb_local ) = ', nzb_local_max
[254]	899	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	900	ENDIF
	901
[2169]	902	!
	903	!-- In case of non-flat topography, check whether the convention how to
	904	!-- define the topography grid has been set correctly, or whether the default
	905	!-- is applicable. If this is not possible, abort.
	906	IF ( TRIM( topography_grid_convention ) == ' ' ) THEN
	907	IF ( TRIM( topography ) /= 'single_building' .AND. &
	908	TRIM( topography ) /= 'single_street_canyon' .AND. &
	909	TRIM( topography ) /= 'read_from_file' ) THEN
	910	!-- The default value is not applicable here, because it is only valid
	911	!-- for the two standard cases 'single_building' and 'read_from_file'
	912	!-- defined in init_grid.
	913	WRITE( message_string, * ) &
	914	'The value for "topography_grid_convention" ', &
	915	'is not set. Its default value is & only valid for ', &
	916	'"topography" = ''single_building'', ', &
	917	'''single_street_canyon'' & or ''read_from_file''.', &
	918	' & Choose ''cell_edge'' or ''cell_center''.'
	919	CALL message( 'init_grid', 'PA0239', 1, 2, 0, 6, 0 )
	920	ELSE
	921	!-- The default value is applicable here.
	922	!-- Set convention according to topography.
	923	IF ( TRIM( topography ) == 'single_building' .OR. &
	924	TRIM( topography ) == 'single_street_canyon' ) THEN
	925	topography_grid_convention = 'cell_edge'
	926	ELSEIF ( TRIM( topography ) == 'read_from_file' ) THEN
	927	topography_grid_convention = 'cell_center'
	928	ENDIF
	929	ENDIF
	930	ELSEIF ( TRIM( topography_grid_convention ) /= 'cell_edge' .AND. &
	931	TRIM( topography_grid_convention ) /= 'cell_center' ) THEN
	932	WRITE( message_string, * ) &
	933	'The value for "topography_grid_convention" is ', &
	934	'not recognized. & Choose ''cell_edge'' or ''cell_center''.'
	935	CALL message( 'init_grid', 'PA0240', 1, 2, 0, 6, 0 )
	936	ENDIF
	937
[217]	938	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	939	!
[217]	940	!-- The array nzb_local as defined using the 'cell_edge' convention
	941	!-- describes the actual total size of topography which is defined at the
	942	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	943	!-- on the topography walls in y-direction. However, PALM uses individual
	944	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	945	!-- Therefore, the extent of topography in nzb_local is now reduced by
	946	!-- 1dx at the E topography walls and by 1dy at the N topography walls
[1968]	947	!-- to form the basis for nzb_s_inner.
	948	!-- Note, the reverse memory access (i-j instead of j-i) is absolutely
	949	!-- required at this point.
	950	DO j = nys+1, nyn+1
	951	DO i = nxl-1, nxr
[217]	952	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	953	ENDDO
[134]	954	ENDDO
[1968]	955	!
	956	!-- Exchange ghost points
	957	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	958
	959	DO i = nxl, nxr+1
	960	DO j = nys-1, nyn
[217]	961	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	962	ENDDO
[134]	963	ENDDO
[1968]	964	!
	965	!-- Exchange ghost points
	966	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
[217]	967	ENDIF
[1]	968	!
	969	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[1968]	970	nzb_s_inner = nzb_local
	971	nzb_w_inner = nzb_local
[1]	972
	973	!
	974	!-- Initialize remaining index arrays:
	975	!-- first pre-initialize them with nzb_s_inner...
	976	nzb_u_inner = nzb_s_inner
	977	nzb_u_outer = nzb_s_inner
	978	nzb_v_inner = nzb_s_inner
	979	nzb_v_outer = nzb_s_inner
	980	nzb_w_outer = nzb_s_inner
	981	nzb_s_outer = nzb_s_inner
	982
	983	!
	984	!-- ...then extend pre-initialized arrays in their according directions
	985	!-- based on nzb_local using nzb_tmp as a temporary global index array
	986
	987	!
	988	!-- nzb_s_outer:
	989	!-- extend nzb_local east-/westwards first, then north-/southwards
[1968]	990	nzb_tmp = nzb_local
	991	DO j = nys, nyn
	992	DO i = nxl, nxr
[1353]	993	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	994	nzb_local(j,i+1) )
	995	ENDDO
	996	ENDDO
[1968]	997
	998	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	999
[1]	1000	DO i = nxl, nxr
	1001	DO j = nys, nyn
[1353]	1002	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	1003	nzb_tmp(j+1,i) )
	1004	ENDDO
	1005	!
	1006	!-- non-cyclic boundary conditions (overwritten by call of
	1007	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1008	IF ( nys == 0 ) THEN
	1009	j = -1
	1010	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	1011	ENDIF
[1743]	1012	IF ( nyn == ny ) THEN
[1]	1013	j = ny + 1
	1014	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	1015	ENDIF
	1016	ENDDO
	1017	!
	1018	!-- nzb_w_outer:
	1019	!-- identical to nzb_s_outer
	1020	nzb_w_outer = nzb_s_outer
	1021
	1022	!
	1023	!-- nzb_u_inner:
	1024	!-- extend nzb_local rightwards only
[1968]	1025	nzb_tmp = nzb_local
	1026	DO j = nys, nyn
	1027	DO i = nxl, nxr
[1]	1028	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	1029	ENDDO
	1030	ENDDO
[1968]	1031
	1032	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	1033
	1034	nzb_u_inner = nzb_tmp
[1]	1035	!
	1036	!-- nzb_u_outer:
	1037	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	1038	DO i = nxl, nxr
	1039	DO j = nys, nyn
[1353]	1040	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	1041	nzb_tmp(j+1,i) )
	1042	ENDDO
	1043	!
	1044	!-- non-cyclic boundary conditions (overwritten by call of
	1045	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1046	IF ( nys == 0 ) THEN
	1047	j = -1
	1048	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	1049	ENDIF
[1743]	1050	IF ( nyn == ny ) THEN
[1]	1051	j = ny + 1
	1052	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	1053	ENDIF
	1054	ENDDO
	1055
	1056	!
	1057	!-- nzb_v_inner:
	1058	!-- extend nzb_local northwards only
[1968]	1059	nzb_tmp = nzb_local
	1060	DO i = nxl, nxr
	1061	DO j = nys, nyn
[1]	1062	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	1063	ENDDO
	1064	ENDDO
[1968]	1065
	1066	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	1067	nzb_v_inner = nzb_tmp
[1]	1068
	1069	!
	1070	!-- nzb_v_outer:
	1071	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	1072	DO j = nys, nyn
	1073	DO i = nxl, nxr
[1353]	1074	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	1075	nzb_tmp(j,i+1) )
	1076	ENDDO
	1077	!
	1078	!-- non-cyclic boundary conditions (overwritten by call of
	1079	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1080	IF ( nxl == 0 ) THEN
	1081	i = -1
	1082	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	1083	ENDIF
	1084	IF ( nxr == nx ) THEN
	1085	i = nx + 1
	1086	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	1087	ENDIF
	1088	ENDDO
[1804]	1089
[1]	1090	!
	1091	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	1092	!-- boundary conditions, if applicable.
	1093	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	1094	!-- they do not require exchange and are not included here.
[1968]	1095	CALL exchange_horiz_2d_int( nzb_u_inner, nys, nyn, nxl, nxr, nbgp )
	1096	CALL exchange_horiz_2d_int( nzb_u_outer, nys, nyn, nxl, nxr, nbgp )
	1097	CALL exchange_horiz_2d_int( nzb_v_inner, nys, nyn, nxl, nxr, nbgp )
	1098	CALL exchange_horiz_2d_int( nzb_v_outer, nys, nyn, nxl, nxr, nbgp )
	1099	CALL exchange_horiz_2d_int( nzb_w_outer, nys, nyn, nxl, nxr, nbgp )
	1100	CALL exchange_horiz_2d_int( nzb_s_outer, nys, nyn, nxl, nxr, nbgp )
[1]	1101
[49]	1102	!
	1103	!-- Allocate and set the arrays containing the topography height
[1968]	1104	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1), &
	1105	zu_s_inner_l(0:nx+1,0:ny+1), zw_w_inner_l(0:nx+1,0:ny+1) )
	1106
	1107	zu_s_inner = 0.0_wp
	1108	zw_w_inner = 0.0_wp
	1109	zu_s_inner_l = 0.0_wp
	1110	zw_w_inner_l = 0.0_wp
	1111
	1112	DO i = nxl, nxr
	1113	DO j = nys, nyn
	1114	zu_s_inner_l(i,j) = zu(nzb_local(j,i))
	1115	zw_w_inner_l(i,j) = zw(nzb_local(j,i))
	1116	ENDDO
	1117	ENDDO
	1118
	1119	#if defined( __parallel )
	1120	CALL MPI_REDUCE( zu_s_inner_l, zu_s_inner, (nx+2)*(ny+2), &
	1121	MPI_REAL, MPI_SUM, 0, comm2d, ierr )
	1122	CALL MPI_REDUCE( zw_w_inner_l, zw_w_inner, (nx+2)*(ny+2), &
	1123	MPI_REAL, MPI_SUM, 0, comm2d, ierr )
	1124	#else
	1125	zu_s_inner = zu_s_inner_l
	1126	zw_w_inner = zw_w_inner_l
	1127	#endif
[49]	1128
[1968]	1129	DEALLOCATE( zu_s_inner_l, zw_w_inner_l )
	1130	IF ( myid /= 0 ) DEALLOCATE( zu_s_inner, zw_w_inner )
[1221]	1131	!
[1968]	1132	!-- Set south and left ghost points, required for netcdf output
	1133	IF ( myid == 0 ) THEN
	1134	IF( bc_lr_cyc ) THEN
	1135	zu_s_inner(nx+1,:) = zu_s_inner(0,:)
	1136	zw_w_inner(nx+1,:) = zw_w_inner(0,:)
	1137	ELSE
	1138	zu_s_inner(nx+1,:) = zu_s_inner(nx,:)
	1139	zw_w_inner(nx+1,:) = zw_w_inner(nx,:)
	1140	ENDIF
	1141	IF( bc_ns_cyc ) THEN
	1142	zu_s_inner(:,ny+1) = zu_s_inner(:,0)
	1143	zw_w_inner(:,ny+1) = zw_w_inner(:,0)
	1144	ELSE
	1145	zu_s_inner(:,ny+1) = zu_s_inner(:,ny)
	1146	zw_w_inner(:,ny+1) = zw_w_inner(:,ny)
	1147	ENDIF
	1148	ENDIF
	1149	!
[1221]	1150	!-- Set flag arrays to be used for masking of grid points
	1151	DO i = nxlg, nxrg
	1152	DO j = nysg, nyng
	1153	DO k = nzb, nzt+1
[1353]	1154	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	1155	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	1156	ENDDO
	1157	ENDDO
	1158	ENDDO
[1804]	1159
[1]	1160	ENDIF
[1968]	1161	!
	1162	!-- Deallocate temporary array, as it might be reused for different
	1163	!-- grid-levels further below.
	1164	DEALLOCATE( nzb_tmp )
[1]	1165
	1166	!
	1167	!-- Set the individual index arrays which define the k index from which on
	1168	!-- the usual finite difference form (which does not use surface fluxes) is
	1169	!-- applied
[1691]	1170	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	1171	nzb_diff_u = nzb_u_inner + 2
	1172	nzb_diff_v = nzb_v_inner + 2
	1173	nzb_diff_s_inner = nzb_s_inner + 2
	1174	nzb_diff_s_outer = nzb_s_outer + 2
	1175	ELSE
	1176	nzb_diff_u = nzb_u_inner + 1
	1177	nzb_diff_v = nzb_v_inner + 1
	1178	nzb_diff_s_inner = nzb_s_inner + 1
	1179	nzb_diff_s_outer = nzb_s_outer + 1
	1180	ENDIF
	1181
	1182	!
	1183	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	1184	!-- for limitation of near-wall mixing length l_wall further below
	1185	corner_nl = 0
	1186	corner_nr = 0
	1187	corner_sl = 0
	1188	corner_sr = 0
	1189	wall_l = 0
	1190	wall_n = 0
	1191	wall_r = 0
	1192	wall_s = 0
	1193
	1194	DO i = nxl, nxr
	1195	DO j = nys, nyn
	1196	!
	1197	!-- u-component
	1198	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1199	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1200	fym(j,i) = 0.0_wp
	1201	fyp(j,i) = 1.0_wp
[1]	1202	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1203	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1204	fym(j,i) = 1.0_wp
	1205	fyp(j,i) = 0.0_wp
[1]	1206	ENDIF
	1207	!
	1208	!-- v-component
	1209	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1210	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1211	fxm(j,i) = 0.0_wp
	1212	fxp(j,i) = 1.0_wp
[1]	1213	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1214	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1215	fxm(j,i) = 1.0_wp
	1216	fxp(j,i) = 0.0_wp
[1]	1217	ENDIF
	1218	!
	1219	!-- w-component, also used for scalars, separate arrays for shear
	1220	!-- production of tke
	1221	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1222	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1223	wall_w_y(j,i) = 1.0_wp
	1224	fwym(j,i) = 0.0_wp
	1225	fwyp(j,i) = 1.0_wp
[1]	1226	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1227	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1228	wall_w_y(j,i) = 1.0_wp
	1229	fwym(j,i) = 1.0_wp
	1230	fwyp(j,i) = 0.0_wp
[1]	1231	ENDIF
	1232	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1233	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1234	wall_w_x(j,i) = 1.0_wp
	1235	fwxm(j,i) = 0.0_wp
	1236	fwxp(j,i) = 1.0_wp
[1]	1237	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1238	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1239	wall_w_x(j,i) = 1.0_wp
	1240	fwxm(j,i) = 1.0_wp
	1241	fwxp(j,i) = 0.0_wp
[1]	1242	ENDIF
	1243	!
	1244	!-- Wall and corner locations inside buildings for limitation of
	1245	!-- near-wall mixing length l_wall
	1246	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1247
	1248	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1249
	1250	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1251	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1252	nzb_s_inner(j,i-1) ) + 1
	1253	ENDIF
	1254
	1255	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1256	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1257	nzb_s_inner(j,i+1) ) + 1
	1258	ENDIF
	1259
	1260	ENDIF
	1261
	1262	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1263
	1264	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1265	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1266	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1267	nzb_s_inner(j,i-1) ) + 1
	1268	ENDIF
	1269
	1270	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1271	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1272	nzb_s_inner(j,i+1) ) + 1
	1273	ENDIF
	1274
	1275	ENDIF
	1276
	1277	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1278	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1279	ENDIF
	1280
	1281	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1282	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1283	ENDIF
	1284
	1285	ENDDO
	1286	ENDDO
	1287	!
[1931]	1288	!-- Calculate wall flag arrays for the multigrid method.
	1289	!-- Please note, wall flags are only applied in the not cache-optimized
	1290	!-- version.
	1291	IF ( psolver == 'multigrid_noopt' ) THEN
[1968]	1292
[114]	1293	!
[1968]	1294	!-- Gridpoint increment of the current level.
[114]	1295	inc = 1
	1296	DO l = maximum_grid_level, 1 , -1
[1968]	1297	!
	1298	!-- Set grid_level as it is required for exchange_horiz_2d_int
	1299	grid_level = l
[114]	1300
	1301	nxl_l = nxl_mg(l)
	1302	nxr_l = nxr_mg(l)
	1303	nys_l = nys_mg(l)
	1304	nyn_l = nyn_mg(l)
	1305	nzt_l = nzt_mg(l)
	1306	!
	1307	!-- Assign the flag level to be calculated
	1308	SELECT CASE ( l )
	1309	CASE ( 1 )
	1310	flags => wall_flags_1
	1311	CASE ( 2 )
	1312	flags => wall_flags_2
	1313	CASE ( 3 )
	1314	flags => wall_flags_3
	1315	CASE ( 4 )
	1316	flags => wall_flags_4
	1317	CASE ( 5 )
	1318	flags => wall_flags_5
	1319	CASE ( 6 )
	1320	flags => wall_flags_6
	1321	CASE ( 7 )
	1322	flags => wall_flags_7
	1323	CASE ( 8 )
	1324	flags => wall_flags_8
	1325	CASE ( 9 )
	1326	flags => wall_flags_9
	1327	CASE ( 10 )
	1328	flags => wall_flags_10
	1329	END SELECT
	1330
	1331	!
	1332	!-- Depending on the grid level, set the respective bits in case of
	1333	!-- neighbouring walls
	1334	!-- Bit 0: wall to the bottom
	1335	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1336	!-- Bit 2: wall to the south
	1337	!-- Bit 3: wall to the north
	1338	!-- Bit 4: wall to the left
	1339	!-- Bit 5: wall to the right
[116]	1340	!-- Bit 6: inside building
[114]	1341
	1342	flags = 0
	1343
[927]	1344	!
	1345	!-- In case of masking method, flags are not set and multigrid method
	1346	!-- works like FFT-solver
[1931]	1347	IF ( .NOT. masking_method ) THEN
[927]	1348
[1968]	1349	!
	1350	!-- Allocate temporary array for topography heights on coarser grid
	1351	!-- level. Please note, 2 ghoist points are required, in order to
	1352	!-- calculate flags() on the interior ghost point.
	1353	ALLOCATE( nzb_tmp(nys_l-2:nyn_l+2,nxl_l-2:nxr_l+2) )
	1354	nzb_tmp = 0
	1355
	1356	DO i = nxl_l, nxr_l
	1357	DO j = nys_l, nyn_l
	1358	nzb_tmp(j,i) = nzb_local(jinc,iinc)
	1359	ENDDO
	1360	ENDDO
	1361	!
	1362	!-- Exchange ghost points on respective multigrid level. 2 ghost points
	1363	!-- are required, in order to calculate flags on
	1364	!-- nys_l-1 / nyn_l+1 / nxl_l-1 / nxr_l+1. The alternative would be to
	1365	!-- exchange 3D-INTEGER array flags on the respective multigrid level.
	1366	CALL exchange_horiz_2d_int( nzb_tmp, nys_l, nyn_l, nxl_l, nxr_l, 2 )
	1367	!
	1368	!-- Set non-cyclic boundary conditions on respective multigrid level
	1369	IF ( .NOT. bc_ns_cyc ) THEN
[2021]	1370	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1968]	1371	nzb_tmp(-2,:) = nzb_tmp(0,:)
	1372	nzb_tmp(-1,:) = nzb_tmp(0,:)
	1373	ENDIF
[2021]	1374	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
	1375	nzb_tmp(nyn_l+2,:) = nzb_tmp(nyn_l,:)
	1376	nzb_tmp(nyn_l+1,:) = nzb_tmp(nyn_l,:)
[1968]	1377	ENDIF
	1378	ENDIF
	1379	IF ( .NOT. bc_lr_cyc ) THEN
[2021]	1380	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1968]	1381	nzb_tmp(:,-2) = nzb_tmp(:,0)
	1382	nzb_tmp(:,-1) = nzb_tmp(:,0)
	1383	ENDIF
[2021]	1384	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
	1385	nzb_tmp(:,nxr_l+1) = nzb_tmp(:,nxr_l)
	1386	nzb_tmp(:,nxr_l+2) = nzb_tmp(:,nxr_l)
[1968]	1387	ENDIF
	1388	ENDIF
	1389
[927]	1390	DO i = nxl_l-1, nxr_l+1
	1391	DO j = nys_l-1, nyn_l+1
[1968]	1392	DO k = nzb, nzt_l+1
[114]	1393	!
[927]	1394	!-- Inside/outside building (inside building does not need
	1395	!-- further tests for walls)
[1968]	1396	IF ( k*inc <= nzb_tmp(j,i) ) THEN
[114]	1397
[927]	1398	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1399
[927]	1400	ELSE
[114]	1401	!
[927]	1402	!-- Bottom wall
[1968]	1403	IF ( (k-1)*inc <= nzb_tmp(j,i) ) THEN
[927]	1404	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1405	ENDIF
[114]	1406	!
[927]	1407	!-- South wall
[1968]	1408	IF ( k*inc <= nzb_tmp(j-1,i) ) THEN
[927]	1409	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1410	ENDIF
[114]	1411	!
[927]	1412	!-- North wall
[1968]	1413	IF ( k*inc <= nzb_tmp(j+1,i) ) THEN
[927]	1414	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1415	ENDIF
[114]	1416	!
[927]	1417	!-- Left wall
[1968]	1418	IF ( k*inc <= nzb_tmp(j,i-1) ) THEN
[927]	1419	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1420	ENDIF
[114]	1421	!
[927]	1422	!-- Right wall
[1968]	1423	IF ( k*inc <= nzb_tmp(j,i+1) ) THEN
[927]	1424	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1425	ENDIF
	1426
[114]	1427	ENDIF
	1428
[927]	1429	ENDDO
[114]	1430	ENDDO
	1431	ENDDO
	1432
[1968]	1433	DEALLOCATE( nzb_tmp )
	1434
[927]	1435	ENDIF
	1436
[114]	1437	inc = inc * 2
	1438
	1439	ENDDO
[1968]	1440	!
	1441	!-- Reset grid_level to "normal" grid
	1442	grid_level = 0
	1443
[114]	1444	ENDIF
[861]	1445	!
[1942]	1446	!-- Allocate flags needed for masking walls. Even though these flags are only
[2021]	1447	!-- required in the ws-scheme, the arrays need to be allocated here as they are
[1942]	1448	!-- used in OpenACC directives.
[1677]	1449	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1450	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1451	wall_flags_0 = 0
	1452	wall_flags_00 = 0
[114]	1453	!
[2021]	1454	!-- Init flags for ws-scheme to degrade order of the numerics near walls, i.e.
	1455	!-- to decrease the numerical stencil appropriately.
[1942]	1456	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' .OR.&
	1457	scalar_advec == 'ws-scheme-mono' ) THEN
	1458	CALL ws_init_flags
[861]	1459	ENDIF
	1460
	1461	!
[1]	1462	!-- In case of topography: limit near-wall mixing length l_wall further:
	1463	!-- Go through all points of the subdomain one by one and look for the closest
	1464	!-- surface
	1465	IF ( TRIM(topography) /= 'flat' ) THEN
	1466	DO i = nxl, nxr
	1467	DO j = nys, nyn
	1468
	1469	nzb_si = nzb_s_inner(j,i)
	1470	vi = vertical_influence(nzb_si)
	1471
	1472	IF ( wall_n(j,i) > 0 ) THEN
	1473	!
	1474	!-- North wall (y distance)
	1475	DO k = wall_n(j,i), nzb_si
[1353]	1476	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1477	ENDDO
	1478	!
	1479	!-- Above North wall (yz distance)
	1480	DO k = nzb_si + 1, nzb_si + vi
[1353]	1481	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1482	SQRT( 0.25_wp * dy**2 + &
[1]	1483	( zu(k) - zw(nzb_si) )**2 ) )
	1484	ENDDO
	1485	!
	1486	!-- Northleft corner (xy distance)
	1487	IF ( corner_nl(j,i) > 0 ) THEN
	1488	DO k = corner_nl(j,i), nzb_si
	1489	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1490	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1491	ENDDO
	1492	!
	1493	!-- Above Northleft corner (xyz distance)
	1494	DO k = nzb_si + 1, nzb_si + vi
[1353]	1495	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1496	SQRT( 0.25_wp * (dx2 + dy2) + &
	1497	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1498	ENDDO
	1499	ENDIF
	1500	!
	1501	!-- Northright corner (xy distance)
	1502	IF ( corner_nr(j,i) > 0 ) THEN
	1503	DO k = corner_nr(j,i), nzb_si
[1353]	1504	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1505	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1506	ENDDO
	1507	!
	1508	!-- Above northright corner (xyz distance)
	1509	DO k = nzb_si + 1, nzb_si + vi
[1353]	1510	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1511	SQRT( 0.25_wp * (dx2 + dy2) + &
	1512	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1513	ENDDO
	1514	ENDIF
	1515	ENDIF
	1516
	1517	IF ( wall_s(j,i) > 0 ) THEN
	1518	!
	1519	!-- South wall (y distance)
	1520	DO k = wall_s(j,i), nzb_si
[1353]	1521	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1522	ENDDO
	1523	!
	1524	!-- Above south wall (yz distance)
[1353]	1525	DO k = nzb_si + 1, nzb_si + vi
	1526	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1527	SQRT( 0.25_wp * dy**2 + &
[1]	1528	( zu(k) - zw(nzb_si) )**2 ) )
	1529	ENDDO
	1530	!
	1531	!-- Southleft corner (xy distance)
	1532	IF ( corner_sl(j,i) > 0 ) THEN
	1533	DO k = corner_sl(j,i), nzb_si
[1353]	1534	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1535	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1536	ENDDO
	1537	!
	1538	!-- Above southleft corner (xyz distance)
	1539	DO k = nzb_si + 1, nzb_si + vi
[1353]	1540	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1541	SQRT( 0.25_wp * (dx2 + dy2) + &
	1542	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1543	ENDDO
	1544	ENDIF
	1545	!
	1546	!-- Southright corner (xy distance)
	1547	IF ( corner_sr(j,i) > 0 ) THEN
	1548	DO k = corner_sr(j,i), nzb_si
[1353]	1549	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1550	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1551	ENDDO
	1552	!
	1553	!-- Above southright corner (xyz distance)
	1554	DO k = nzb_si + 1, nzb_si + vi
[1353]	1555	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1556	SQRT( 0.25_wp * (dx2 + dy2) + &
	1557	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1558	ENDDO
	1559	ENDIF
	1560
	1561	ENDIF
	1562
	1563	IF ( wall_l(j,i) > 0 ) THEN
	1564	!
	1565	!-- Left wall (x distance)
	1566	DO k = wall_l(j,i), nzb_si
[1353]	1567	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1568	ENDDO
	1569	!
	1570	!-- Above left wall (xz distance)
	1571	DO k = nzb_si + 1, nzb_si + vi
[1353]	1572	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1573	SQRT( 0.25_wp * dx**2 + &
	1574	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1575	ENDDO
	1576	ENDIF
	1577
	1578	IF ( wall_r(j,i) > 0 ) THEN
	1579	!
	1580	!-- Right wall (x distance)
	1581	DO k = wall_r(j,i), nzb_si
[1353]	1582	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1583	ENDDO
	1584	!
	1585	!-- Above right wall (xz distance)
	1586	DO k = nzb_si + 1, nzb_si + vi
[1353]	1587	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1588	SQRT( 0.25_wp * dx**2 + &
[1]	1589	( zu(k) - zw(nzb_si) )**2 ) )
	1590	ENDDO
	1591
	1592	ENDIF
	1593
	1594	ENDDO
	1595	ENDDO
	1596
	1597	ENDIF
	1598
	1599	!
	1600	!-- Multiplication with wall_adjustment_factor
	1601	l_wall = wall_adjustment_factor * l_wall
	1602
	1603	!
[709]	1604	!-- Set lateral boundary conditions for l_wall
[667]	1605	CALL exchange_horiz( l_wall, nbgp )
	1606
[1]	1607	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
[1968]	1608	vertical_influence, wall_l, wall_n, wall_r, wall_s )
[1]	1609
	1610
	1611	END SUBROUTINE init_grid

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