Home

Context Navigation

source: palm/trunk/SOURCE/init_grid.f90 @ 1942

Last change on this file since 1942 was 1942, checked in by suehring, 8 years ago
filter topography by filling holes resolved by only one grid point ;initialization of wall_flags_0 and wall_flags_00 moved to advec_ws
Property svn:keywords set to `Id`
File size: 56.9 KB

Rev	Line
[1682]	1	!> @file init_grid.f90
[1743]	2	!-------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1818]	16	! Copyright 1997-2016 Leibniz Universitaet Hannover
[1743]	17	!-------------------------------------------------------------------------------!
[1036]	18	!
[254]	19	! Current revisions:
[1]	20	! -----------------
[1942]	21	! Topography filter implemented to fill holes resolved by only one grid point.
	22	! Initialization of flags for ws-scheme moved to advec_ws.
[1932]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1942 2016-06-14 12:18:18Z suehring $
	27	!
[1932]	28	! 1931 2016-06-10 12:06:59Z suehring
	29	! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid
	30	!
[1911]	31	! 1910 2016-05-26 06:49:46Z raasch
	32	! Bugfix: if topography is read from file, Neumann conditions are used for the
	33	! nzb_local array (instead of cyclic conditions) in case that non-cyclic
	34	! boundary conditions are switched on for the run
	35	!
[1903]	36	! 1902 2016-05-09 11:18:56Z suehring
[1910]	37	! Set topography flags for multigrid solver only (not for multigrid_fast)
[1903]	38	!
[1887]	39	! 1886 2016-04-21 11:20:47Z suehring
	40	! Bugfix: setting advection flags near walls
	41	! reformulated index values for nzb_v_inner
	42	! variable discriptions added in declaration block
	43	!
[1846]	44	! 1845 2016-04-08 08:29:13Z raasch
	45	! nzb_2d removed
	46	!
[1805]	47	! 1804 2016-04-05 16:30:18Z maronga
	48	! Removed code for parameter file check (__check)
	49	!
[1780]	50	! 1779 2016-03-03 08:01:28Z raasch
	51	! coupling_char is trimmed at every place it occurs, because it can have
	52	! different length now
	53	!
[1763]	54	! 1762 2016-02-25 12:31:13Z hellstea
	55	! Introduction of nested domain feature
	56	!
[1744]	57	! 1743 2016-01-13 10:23:51Z raasch
	58	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	59	! total domain
	60	!
[1692]	61	! 1691 2015-10-26 16:17:44Z maronga
	62	! Renamed prandtl_layer to constant_flux_layer.
	63	!
[1683]	64	! 1682 2015-10-07 23:56:08Z knoop
	65	! Code annotations made doxygen readable
	66	!
[1678]	67	! 1677 2015-10-02 13:25:23Z boeske
	68	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	69	!
[1676]	70	! 1675 2015-10-02 08:28:59Z gronemeier
	71	! Bugfix: Definition of topography grid levels
	72	!
[1662]	73	! 1660 2015-09-21 08:15:16Z gronemeier
	74	! Bugfix: Definition of topography grid levels if vertical grid stretching
	75	! starts below the maximum topography height.
	76	!
[1581]	77	! 1580 2015-04-10 13:43:49Z suehring
	78	! Bugfix: setting flags for 5th order scheme near buildings
	79	!
[1576]	80	! 1575 2015-03-27 09:56:27Z raasch
	81	! adjustments for psolver-queries
	82	!
[1558]	83	! 1557 2015-03-05 16:43:04Z suehring
	84	! Adjustment for monotoinic limiter
	85	!
[1419]	86	! 1418 2014-06-06 13:05:08Z fricke
	87	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	88	! condition and a negative value for dz_stretch_level the condition
	89	! was always true for the whole model domain
	90	!
[1410]	91	! 1409 2014-05-23 12:11:32Z suehring
	92	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	93	! j <= nysv
	94	!
[1354]	95	! 1353 2014-04-08 15:21:23Z heinze
	96	! REAL constants provided with KIND-attribute
	97	!
[1323]	98	! 1322 2014-03-20 16:38:49Z raasch
	99	! REAL constants defined as wp-kind
	100	!
[1321]	101	! 1320 2014-03-20 08:40:49Z raasch
[1320]	102	! ONLY-attribute added to USE-statements,
	103	! kind-parameters added to all INTEGER and REAL declaration statements,
	104	! kinds are defined in new module kinds,
	105	! revision history before 2012 removed,
	106	! comment fields (!:) to be used for variable explanations added to
	107	! all variable declaration statements
[1321]	108	!
[1222]	109	! 1221 2013-09-10 08:59:13Z raasch
	110	! wall_flags_00 introduced to hold bits 32-63,
	111	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	112	! loops optimized for openACC (pres + flow_statistics)
	113	!
[1093]	114	! 1092 2013-02-02 11:24:22Z raasch
	115	! unused variables removed
	116	!
[1070]	117	! 1069 2012-11-28 16:18:43Z maronga
[1779]	118	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	119	! ocean model in case of coupled runs
[1070]	120	!
[1037]	121	! 1036 2012-10-22 13:43:42Z raasch
	122	! code put under GPL (PALM 3.9)
	123	!
[1017]	124	! 1015 2012-09-27 09:23:24Z raasch
	125	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	126	! nzb_w_inner+1
	127	!
[997]	128	! 996 2012-09-07 10:41:47Z raasch
	129	! little reformatting
	130	!
[979]	131	! 978 2012-08-09 08:28:32Z fricke
	132	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	133	! Bugfix: Set wall_flags_0 for inflow boundary
	134	!
[928]	135	! 927 2012-06-06 19:15:04Z raasch
	136	! Wall flags are not set for multigrid method in case of masking method
	137	!
[865]	138	! 864 2012-03-27 15:10:33Z gryschka
[927]	139	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	140	! were not correctly defined for k=1.
[865]	141	!
[863]	142	! 861 2012-03-26 14:18:34Z suehring
[861]	143	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	144	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	145	! model domain.!
[861]	146	! Initialization of nzb_s_inner and nzb_w_inner.
	147	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	148	! while setting wall_flags_0
	149	!
[844]	150	! 843 2012-02-29 15:16:21Z gryschka
	151	! In case of ocean and dirichlet bc for u and v at the bottom
	152	! the first u-level ist defined at same height as the first w-level
	153	!
[819]	154	! 818 2012-02-08 16:11:23Z maronga
	155	! Bugfix: topo_height is only required if topography is used. It is thus now
	156	! allocated in the topography branch
	157	!
[810]	158	! 809 2012-01-30 13:32:58Z maronga
	159	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	160	!
[808]	161	! 807 2012-01-25 11:53:51Z maronga
	162	! New cpp directive "__check" implemented which is used by check_namelist_files
	163	!
[1]	164	! Revision 1.1 1997/08/11 06:17:45 raasch
	165	! Initial revision (Testversion)
	166	!
	167	!
	168	! Description:
	169	! ------------
[1682]	170	!> Creating grid depending constants
[1]	171	!------------------------------------------------------------------------------!
[1682]	172	SUBROUTINE init_grid
	173
[1942]	174	USE advec_ws, &
	175	ONLY: ws_init_flags
[1]	176
[1320]	177	USE arrays_3d, &
	178	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	179	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	180
[1353]	181	USE control_parameters, &
[1910]	182	ONLY: bc_lr_cyc, bc_ns_cyc, building_height, building_length_x, &
[1320]	183	building_length_y, building_wall_left, building_wall_south, &
	184	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	185	canyon_width_x, canyon_width_y, constant_flux_layer, &
	186	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	187	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	188	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	189	masking_method, maximum_grid_level, message_string, &
[1942]	190	momentum_advec, nest_domain, ocean, outflow_l, outflow_n, &
[1762]	191	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	192	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	193	wall_adjustment_factor
[1320]	194
	195	USE grid_variables, &
	196	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	197	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	198	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	199
	200	USE indices, &
[1942]	201	ONLY: flags, nbgp, nx, nxl, nxlg, nxl_mg, nxr, nxrg, nxr_mg, &
	202	ny, nyn, nyng, nyn_mg, nys, nys_mg, nysg, nz, nzb, &
[1845]	203	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
	204	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
	205	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
	206	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
[1320]	207	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	208	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	209	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	210	wall_flags_9
	211
	212	USE kinds
	213
[1]	214	USE pegrid
	215
	216	IMPLICIT NONE
	217
[1942]	218	INTEGER(iwp) :: bh !< temporary vertical index of building height
	219	INTEGER(iwp) :: blx !< grid point number of building size along x
	220	INTEGER(iwp) :: bly !< grid point number of building size along y
	221	INTEGER(iwp) :: bxl !< index for left building wall
	222	INTEGER(iwp) :: bxr !< index for right building wall
	223	INTEGER(iwp) :: byn !< index for north building wall
	224	INTEGER(iwp) :: bys !< index for south building wall
	225	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
	226	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
	227	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
	228	INTEGER(iwp) :: cxl !< index for left canyon wall
	229	INTEGER(iwp) :: cxr !< index for right canyon wall
	230	INTEGER(iwp) :: cyn !< index for north canyon wall
	231	INTEGER(iwp) :: cys !< index for south canyon wall
	232	INTEGER(iwp) :: gls !< number of lateral ghost points at total model domain boundaries required for multigrid solver
	233	INTEGER(iwp) :: i !< index variable along x
	234	INTEGER(iwp) :: ii !< loop variable for reading topography file
	235	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
	236	INTEGER(iwp) :: j !< index variable along y
	237	INTEGER(iwp) :: k !< index variable along z
	238	INTEGER(iwp) :: l !< loop variable
	239	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
	240	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
	241	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
	242	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
	243	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
	244	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
	245	INTEGER(iwp) :: num_hole !< number of holes (in topography) resolved by only one grid point
	246	INTEGER(iwp) :: num_wall !< number of surrounding vertical walls for a single grid point
	247	INTEGER(iwp) :: vi !< dummy for vertical influence
[1]	248
[1886]	249	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
[1931]	250	vertical_influence !< number of vertical grid points above obstacle where adjustment of near-wall mixing length is required
[1886]	251
[1931]	252	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of north-left corner location to limit near-wall mixing length
[1886]	253	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
	254	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
	255	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
[1931]	256	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to adjacent left-facing
[1886]	257	!< wall
	258	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
	259	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
	260	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
	261	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography
	262	!< top at cell-center
[1931]	263	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate topography indices on u- and v-grid
[1]	264
[1942]	265	LOGICAL :: hole = .FALSE. !< flag to check if any holes resolved by only 1 grid point were filled
[1]	266
[1886]	267	REAL(wp) :: dx_l !< grid spacing along x on different multigrid level
	268	REAL(wp) :: dy_l !< grid spacing along y on different multigrid level
	269	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
[861]	270
[1931]	271	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for topography height
[1]	272
[667]	273
[1]	274	!
[709]	275	!-- Calculation of horizontal array bounds including ghost layers
[667]	276	nxlg = nxl - nbgp
	277	nxrg = nxr + nbgp
	278	nysg = nys - nbgp
	279	nyng = nyn + nbgp
[709]	280
[667]	281	!
[1]	282	!-- Allocate grid arrays
[1353]	283	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	284	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	285
	286	!
	287	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	288	IF ( dz == -1.0_wp ) THEN
[254]	289	message_string = 'missing dz'
	290	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	291	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	292	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	293	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	294	ENDIF
[94]	295
[1]	296	!
[94]	297	!-- Define the vertical grid levels
	298	IF ( .NOT. ocean ) THEN
	299	!
	300	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	301	!-- The second u-level (k=1) corresponds to the top of the
[94]	302	!-- Prandtl-layer.
[667]	303
	304	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	305	zu(0) = 0.0_wp
	306	! zu(0) = - dz * 0.5_wp
[667]	307	ELSE
[1353]	308	zu(0) = - dz * 0.5_wp
[667]	309	ENDIF
[1353]	310	zu(1) = dz * 0.5_wp
[1]	311
[94]	312	dz_stretch_level_index = nzt+1
	313	dz_stretched = dz
	314	DO k = 2, nzt+1
	315	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	316	dz_stretched = dz_stretched * dz_stretch_factor
	317	dz_stretched = MIN( dz_stretched, dz_max )
	318	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	319	ENDIF
	320	zu(k) = zu(k-1) + dz_stretched
	321	ENDDO
[1]	322
	323	!
[94]	324	!-- Compute the w-levels. They are always staggered half-way between the
[843]	325	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	326	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	327	!-- The top w-level is extrapolated linearly.
[1353]	328	zw(0) = 0.0_wp
[94]	329	DO k = 1, nzt
[1353]	330	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	331	ENDDO
[1353]	332	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	333
[94]	334	ELSE
[1]	335	!
[843]	336	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	337	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	338	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	339	!-- w-level are defined at same height, but staggered from the second level.
	340	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	341	zu(nzt+1) = dz * 0.5_wp
	342	zu(nzt) = - dz * 0.5_wp
[94]	343
	344	dz_stretch_level_index = 0
	345	dz_stretched = dz
	346	DO k = nzt-1, 0, -1
[1418]	347	!
	348	!-- The default value of dz_stretch_level is positive, thus the first
	349	!-- condition is always true. Hence, the second condition is necessary.
	350	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	351	.AND. dz_stretched < dz_max ) THEN
[94]	352	dz_stretched = dz_stretched * dz_stretch_factor
	353	dz_stretched = MIN( dz_stretched, dz_max )
	354	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	355	ENDIF
	356	zu(k) = zu(k+1) - dz_stretched
	357	ENDDO
	358
	359	!
	360	!-- Compute the w-levels. They are always staggered half-way between the
[843]	361	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	362	!-- at the ground. In this case the first u- and w-level are defined at
	363	!-- same height. The top w-level (nzt+1) is not used but set for
	364	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	365	zw(nzt+1) = dz
[1353]	366	zw(nzt) = 0.0_wp
[94]	367	DO k = 0, nzt
[1353]	368	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	369	ENDDO
	370
[843]	371	!
	372	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	373	!-- at same height.
	374	IF ( ibc_uv_b == 0 ) THEN
	375	zu(0) = zw(0)
	376	ENDIF
	377
[94]	378	ENDIF
	379
	380	!
[1]	381	!-- Compute grid lengths.
	382	DO k = 1, nzt+1
	383	dzu(k) = zu(k) - zu(k-1)
[1353]	384	ddzu(k) = 1.0_wp / dzu(k)
[1]	385	dzw(k) = zw(k) - zw(k-1)
[1353]	386	ddzw(k) = 1.0_wp / dzw(k)
[1]	387	ENDDO
	388
	389	DO k = 1, nzt
[1353]	390	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	391	ENDDO
[667]	392
	393	!
[709]	394	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	395	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	396	!-- is only dz/2, but should be dz. Therefore, an additional array
	397	!-- containing with appropriate grid information is created for these
	398	!-- solvers.
[1575]	399	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	400	ALLOCATE( ddzu_pres(1:nzt+1) )
	401	ddzu_pres = ddzu
[864]	402	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	403	ENDIF
[1]	404
	405	!
	406	!-- In case of multigrid method, compute grid lengths and grid factors for the
	407	!-- grid levels
[1575]	408	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	409
	410	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	411	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	412	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	413	f1_mg(nzb+1:nzt,maximum_grid_level), &
	414	f2_mg(nzb+1:nzt,maximum_grid_level), &
	415	f3_mg(nzb+1:nzt,maximum_grid_level) )
	416
	417	dzu_mg(:,maximum_grid_level) = dzu
[667]	418	!
[864]	419	!-- Next line to ensure an equally spaced grid.
	420	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	421
[1]	422	dzw_mg(:,maximum_grid_level) = dzw
	423	nzt_l = nzt
	424	DO l = maximum_grid_level-1, 1, -1
[1353]	425	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	426	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	427	nzt_l = nzt_l / 2
	428	DO k = 2, nzt_l+1
	429	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	430	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	431	ENDDO
	432	ENDDO
	433
	434	nzt_l = nzt
	435	dx_l = dx
	436	dy_l = dy
	437	DO l = maximum_grid_level, 1, -1
[1353]	438	ddx2_mg(l) = 1.0_wp / dx_l**2
	439	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	440	DO k = nzb+1, nzt_l
[1353]	441	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	442	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	443	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	444	f2_mg(k,l) + f3_mg(k,l)
	445	ENDDO
	446	nzt_l = nzt_l / 2
[1353]	447	dx_l = dx_l * 2.0_wp
	448	dy_l = dy_l * 2.0_wp
[1]	449	ENDDO
	450
	451	ENDIF
	452
	453	!
	454	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	455	ddx = 1.0_wp / dx
	456	ddy = 1.0_wp / dy
[1]	457	dx2 = dx * dx
	458	dy2 = dy * dy
[1353]	459	ddx2 = 1.0_wp / dx2
	460	ddy2 = 1.0_wp / dy2
[1]	461
	462	!
	463	!-- Compute the grid-dependent mixing length.
	464	DO k = 1, nzt
[1322]	465	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	466	ENDDO
	467
	468	!
	469	!-- Allocate outer and inner index arrays for topography and set
[114]	470	!-- defaults.
	471	!-- nzb_local has to contain additional layers of ghost points for calculating
	472	!-- the flag arrays needed for the multigrid method
	473	gls = 2**( maximum_grid_level )
[861]	474	IF ( gls < nbgp ) gls = nbgp
[667]	475
[114]	476	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	477	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	478	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	479	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	480	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	481	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	482	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	483	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	484	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	485	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	486	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	487	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	488	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	489	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	490	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	491	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	492	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	493	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	494	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	495	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	496	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	497	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
[1221]	498	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	499	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	500	wall_e_x(nysg:nyng,nxlg:nxrg), &
	501	wall_e_y(nysg:nyng,nxlg:nxrg), &
	502	wall_u(nysg:nyng,nxlg:nxrg), &
	503	wall_v(nysg:nyng,nxlg:nxrg), &
	504	wall_w_x(nysg:nyng,nxlg:nxrg), &
	505	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	506
	507
[667]	508
	509	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	510
[818]	511
[1]	512	nzb_s_inner = nzb; nzb_s_outer = nzb
	513	nzb_u_inner = nzb; nzb_u_outer = nzb
	514	nzb_v_inner = nzb; nzb_v_outer = nzb
	515	nzb_w_inner = nzb; nzb_w_outer = nzb
	516
[1353]	517	rflags_s_inner = 1.0_wp
	518	rflags_invers = 1.0_wp
[1221]	519
[1]	520	!
[19]	521	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	522	!-- form (which does not use surface fluxes) is applied
[1691]	523	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	524	nzb_diff = nzb + 2
	525	ELSE
	526	nzb_diff = nzb + 1
	527	ENDIF
[19]	528	IF ( use_top_fluxes ) THEN
	529	nzt_diff = nzt - 1
	530	ELSE
	531	nzt_diff = nzt
	532	ENDIF
[1]	533
	534	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	535	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	536
[1353]	537	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	538	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	539	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	540	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	541
	542	!
	543	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	544	!-- for the moment,
	545	!-- multiplication with wall_adjustment_factor near the end of this routine
	546	l_wall(nzb,:,:) = l_grid(1)
	547	DO k = nzb+1, nzt
	548	l_wall(k,:,:) = l_grid(k)
	549	ENDDO
	550	l_wall(nzt+1,:,:) = l_grid(nzt)
	551
	552	ALLOCATE ( vertical_influence(nzb:nzt) )
	553	DO k = 1, nzt
	554	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	555	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	556	ENDDO
	557
	558	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	559	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	560	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	561	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	562	'threshold given by only local', &
	563	' &horizontal reduction of near_wall ', &
	564	'mixing length l_wall', &
	565	' &starting from height level k = ', k, '.'
	566	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	567	EXIT
	568	ENDIF
	569	ENDDO
	570	vertical_influence(0) = vertical_influence(1)
	571
[667]	572	DO i = nxlg, nxrg
	573	DO j = nysg, nyng
[1]	574	DO k = nzb_s_inner(j,i) + 1, &
	575	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	576	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	577	ENDDO
	578	ENDDO
	579	ENDDO
	580
	581	!
	582	!-- Set outer and inner index arrays for non-flat topography.
	583	!-- Here consistency checks concerning domain size and periodicity are
	584	!-- necessary.
	585	!-- Within this SELECT CASE structure only nzb_local is initialized
	586	!-- individually depending on the chosen topography type, all other index
	587	!-- arrays are initialized further below.
	588	SELECT CASE ( TRIM( topography ) )
	589
	590	CASE ( 'flat' )
	591	!
[555]	592	!-- nzb_local is required for the multigrid solver
	593	nzb_local = 0
[1]	594
	595	CASE ( 'single_building' )
	596	!
	597	!-- Single rectangular building, by default centered in the middle of the
	598	!-- total domain
	599	blx = NINT( building_length_x / dx )
	600	bly = NINT( building_length_y / dy )
[1675]	601	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	602	IF ( ABS( zw(bh ) - building_height ) == &
	603	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	604
[1322]	605	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	606	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	607	ENDIF
	608	bxl = NINT( building_wall_left / dx )
	609	bxr = bxl + blx
	610
[1322]	611	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	612	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	613	ENDIF
	614	bys = NINT( building_wall_south / dy )
	615	byn = bys + bly
	616
	617	!
	618	!-- Building size has to meet some requirements
	619	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	620	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	621	WRITE( message_string, * ) 'inconsistent building parameters:', &
	622	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	623	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	624	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	625	ENDIF
	626
	627	!
[217]	628	!-- Define the building.
[1]	629	nzb_local = 0
[134]	630	nzb_local(bys:byn,bxl:bxr) = bh
[1]	631
[240]	632	CASE ( 'single_street_canyon' )
	633	!
	634	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	635	!-- The canyon is centered in the other direction by default.
[1322]	636	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	637	!
	638	!-- Street canyon in y direction
	639	cwx = NINT( canyon_width_x / dx )
[1322]	640	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	641	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	642	ENDIF
	643	cxl = NINT( canyon_wall_left / dx )
	644	cxr = cxl + cwx
	645
[1322]	646	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	647	!
	648	!-- Street canyon in x direction
	649	cwy = NINT( canyon_width_y / dy )
[1322]	650	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	651	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	652	ENDIF
	653	cys = NINT( canyon_wall_south / dy )
	654	cyn = cys + cwy
	655
	656	ELSE
[254]	657
	658	message_string = 'no street canyon width given'
	659	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	660
[240]	661	ENDIF
	662
[1675]	663	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	664	IF ( ABS( zw(ch ) - canyon_height ) == &
	665	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	666
[240]	667	dp_level_ind_b = ch
	668	!
	669	!-- Street canyon size has to meet some requirements
[1322]	670	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	671	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	672	( ch < 3 ) ) THEN
[1353]	673	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	674	'&cxl=', cxl, 'cxr=', cxr, &
	675	'cwx=', cwx, &
[254]	676	'ch=', ch, 'nx=', nx, 'ny=', ny
	677	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	678	ENDIF
[1322]	679	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	680	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	681	( ch < 3 ) ) THEN
[1353]	682	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	683	'&cys=', cys, 'cyn=', cyn, &
	684	'cwy=', cwy, &
[254]	685	'ch=', ch, 'nx=', nx, 'ny=', ny
	686	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	687	ENDIF
	688	ENDIF
[1353]	689	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	690	canyon_width_y /= 9999999.9_wp ) THEN
	691	message_string = 'inconsistent canyon parameters:' // &
	692	'&street canyon can only be oriented' // &
[254]	693	'&either in x- or in y-direction'
	694	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	695	ENDIF
	696
	697	nzb_local = ch
[1322]	698	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	699	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	700	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	701	nzb_local(cys+1:cyn-1,:) = 0
	702	ENDIF
	703
[1]	704	CASE ( 'read_from_file' )
[759]	705
[818]	706	ALLOCATE ( topo_height(0:ny,0:nx) )
	707
[759]	708	DO ii = 0, io_blocks-1
	709	IF ( ii == io_group ) THEN
	710
[1]	711	!
[759]	712	!-- Arbitrary irregular topography data in PALM format (exactly
	713	!-- matching the grid size and total domain size)
[1779]	714	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	715	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[759]	716	DO j = ny, 0, -1
	717	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	718	ENDDO
	719
	720	GOTO 12
	721
[1779]	722	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	723	' does not exist'
[759]	724	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	725
[1779]	726	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	727	TRIM( coupling_char )
[759]	728	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	729
	730	12 CLOSE( 90 )
	731
	732	ENDIF
[1804]	733	#if defined( __parallel )
[759]	734	CALL MPI_BARRIER( comm2d, ierr )
	735	#endif
[559]	736	ENDDO
[759]	737
[1]	738	!
	739	!-- Calculate the index height of the topography
	740	DO i = 0, nx
	741	DO j = 0, ny
[1675]	742	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	743	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	744	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	745	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	746	ENDDO
	747	ENDDO
[818]	748
	749	DEALLOCATE ( topo_height )
[1942]	750	!
	751	!-- Filter topography, i.e. fill holes resolved by only one grid point.
	752	!-- Such holes are suspected to lead to velocity blow-ups as continuity
	753	!-- equation on discrete grid cannot be fulfilled in such case.
	754	!-- For now, check only for holes and fill them to the lowest height level
	755	!-- of the directly adjoining grid points along x- and y- direction.
	756	!-- Before checking for holes, set lateral boundary conditions for
	757	!-- topography. After hole-filling, boundary conditions must be set again!
	758	IF ( bc_ns_cyc ) THEN
	759	nzb_local(-1,:) = nzb_local(ny,:)
	760	nzb_local(ny+1,:) = nzb_local(0,:)
	761	ELSE
	762	nzb_local(-1,:) = nzb_local(0,:)
	763	nzb_local(ny+1,:) = nzb_local(ny,:)
	764	ENDIF
[1910]	765
[1942]	766	IF ( bc_lr_cyc ) THEN
	767	nzb_local(:,-1) = nzb_local(:,nx)
	768	nzb_local(:,nx+1) = nzb_local(:,0)
	769	ELSE
	770	nzb_local(:,-1) = nzb_local(:,0)
	771	nzb_local(:,nx+1) = nzb_local(:,nx)
	772	ENDIF
	773
	774	num_hole = 0
	775	DO i = 0, nx
	776	DO j = 0, ny
	777
	778	num_wall = 0
	779
	780	IF ( nzb_local(j-1,i) > nzb_local(j,i) ) &
	781	num_wall = num_wall + 1
	782	IF ( nzb_local(j+1,i) > nzb_local(j,i) ) &
	783	num_wall = num_wall + 1
	784	IF ( nzb_local(j,i-1) > nzb_local(j,i) ) &
	785	num_wall = num_wall + 1
	786	IF ( nzb_local(j,i+1) > nzb_local(j,i) ) &
	787	num_wall = num_wall + 1
	788
	789	IF ( num_wall == 4 ) THEN
	790	hole = .TRUE.
	791	nzb_local(j,i) = MIN( nzb_local(j-1,i), nzb_local(j+1,i), &
	792	nzb_local(j,i-1), nzb_local(j,i+1) )
	793	num_hole = num_hole + 1
	794	ENDIF
	795	ENDDO
	796	ENDDO
[114]	797	!
[1942]	798	!-- Create an informative message if any hole was removed.
	799	IF ( hole ) THEN
	800	WRITE( message_string, * ) num_hole, 'hole(s) resolved by only '//&
	801	'one grid point were filled'
	802	CALL message( 'init_grid', 'PA0430', 0, 0, 0, 6, 0 )
	803	ENDIF
	804	!
[1910]	805	!-- Add cyclic or Neumann boundary conditions (additional layers are for
	806	!-- calculating flag arrays needed for the multigrid sover)
	807	IF ( bc_ns_cyc ) THEN
	808	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	809	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	810	ELSE
	811	DO j = -gls, -1
	812	nzb_local(j,0:nx) = nzb_local(0,0:nx)
	813	ENDDO
	814	DO j = ny+1, ny+gls
	815	nzb_local(j,0:nx) = nzb_local(ny,0:nx)
	816	ENDDO
	817	ENDIF
[667]	818
[1910]	819	IF ( bc_lr_cyc ) THEN
	820	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	821	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	822	ELSE
	823	DO i = -gls, -1
	824	nzb_local(:,i) = nzb_local(:,0)
	825	ENDDO
	826	DO i = nx+1, nx+gls
	827	nzb_local(:,i) = nzb_local(:,nx)
	828	ENDDO
	829	ENDIF
	830
[1]	831	CASE DEFAULT
	832	!
	833	!-- The DEFAULT case is reached either if the parameter topography
[217]	834	!-- contains a wrong character string or if the user has defined a special
[1]	835	!-- case in the user interface. There, the subroutine user_init_grid
	836	!-- checks which of these two conditions applies.
[114]	837	CALL user_init_grid( gls, nzb_local )
[1]	838
	839	END SELECT
	840	!
[861]	841	!-- Determine the maximum level of topography. Furthermore it is used for
	842	!-- steering the degradation of order of the applied advection scheme.
[978]	843	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	844	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	845	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	846	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	847	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	848	nest_domain ) &
	849	THEN
	850	nzb_max = nzt
[978]	851	ENDIF
	852
[861]	853	!
[1]	854	!-- Consistency checks and index array initialization are only required for
[217]	855	!-- non-flat topography, also the initialization of topography height arrays
[49]	856	!-- zu_s_inner and zw_w_inner
[1]	857	IF ( TRIM( topography ) /= 'flat' ) THEN
	858
	859	!
	860	!-- Consistency checks
	861	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	862	WRITE( message_string, * ) 'nzb_local values are outside the', &
	863	'model domain', &
	864	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	865	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	866	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	867	ENDIF
	868
[1910]	869	IF ( bc_lr_cyc ) THEN
[1353]	870	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	871	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	872	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	873	' boundary condition in x-direction'
	874	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	875	ENDIF
	876	ENDIF
[1910]	877	IF ( bc_ns_cyc ) THEN
[1353]	878	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	879	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	880	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	881	' boundary condition in y-direction'
	882	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	883	ENDIF
	884	ENDIF
	885
[217]	886	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	887	!
[217]	888	!-- The array nzb_local as defined using the 'cell_edge' convention
	889	!-- describes the actual total size of topography which is defined at the
	890	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	891	!-- on the topography walls in y-direction. However, PALM uses individual
	892	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	893	!-- Therefore, the extent of topography in nzb_local is now reduced by
	894	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	895	!-- to form the basis for nzb_s_inner.
	896	DO j = -gls, ny + gls
	897	DO i = -gls, nx
	898	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	899	ENDDO
[134]	900	ENDDO
[217]	901	!-- apply cyclic boundary conditions in x-direction
	902	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	903	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	904	DO i = -gls, nx + gls
	905	DO j = -gls, ny
	906	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	907	ENDDO
[134]	908	ENDDO
[217]	909	!-- apply cyclic boundary conditions in y-direction
	910	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	911	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	912	ENDIF
[134]	913
[1]	914	!
	915	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	916	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	917	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	918
	919	!
	920	!-- Initialize remaining index arrays:
	921	!-- first pre-initialize them with nzb_s_inner...
	922	nzb_u_inner = nzb_s_inner
	923	nzb_u_outer = nzb_s_inner
	924	nzb_v_inner = nzb_s_inner
	925	nzb_v_outer = nzb_s_inner
	926	nzb_w_outer = nzb_s_inner
	927	nzb_s_outer = nzb_s_inner
	928
	929	!
	930	!-- ...then extend pre-initialized arrays in their according directions
	931	!-- based on nzb_local using nzb_tmp as a temporary global index array
	932
	933	!
	934	!-- nzb_s_outer:
	935	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	936	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	937	DO j = -1, ny + 1
	938	DO i = 0, nx
[1353]	939	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	940	nzb_local(j,i+1) )
	941	ENDDO
	942	ENDDO
	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
[667]	968	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	969	DO j = -1, ny + 1
	970	DO i = 0, nx + 1
	971	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	972	ENDDO
	973	ENDDO
[667]	974	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	975
	976	!
	977	!-- nzb_u_outer:
	978	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	979	DO i = nxl, nxr
	980	DO j = nys, nyn
[1353]	981	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	982	nzb_tmp(j+1,i) )
	983	ENDDO
	984	!
	985	!-- non-cyclic boundary conditions (overwritten by call of
	986	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	987	IF ( nys == 0 ) THEN
	988	j = -1
	989	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	990	ENDIF
[1743]	991	IF ( nyn == ny ) THEN
[1]	992	j = ny + 1
	993	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	994	ENDIF
	995	ENDDO
	996
	997	!
	998	!-- nzb_v_inner:
	999	!-- extend nzb_local northwards only
[667]	1000	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	1001	DO i = -1, nx + 1
	1002	DO j = 0, ny + 1
	1003	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	1004	ENDDO
	1005	ENDDO
[1886]	1006	nzb_v_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	1007
	1008	!
	1009	!-- nzb_v_outer:
	1010	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	1011	DO j = nys, nyn
	1012	DO i = nxl, nxr
[1353]	1013	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	1014	nzb_tmp(j,i+1) )
	1015	ENDDO
	1016	!
	1017	!-- non-cyclic boundary conditions (overwritten by call of
	1018	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1019	IF ( nxl == 0 ) THEN
	1020	i = -1
	1021	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	1022	ENDIF
	1023	IF ( nxr == nx ) THEN
	1024	i = nx + 1
	1025	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	1026	ENDIF
	1027	ENDDO
[1804]	1028
[1]	1029	!
	1030	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	1031	!-- boundary conditions, if applicable.
	1032	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	1033	!-- they do not require exchange and are not included here.
	1034	CALL exchange_horiz_2d_int( nzb_u_inner )
	1035	CALL exchange_horiz_2d_int( nzb_u_outer )
	1036	CALL exchange_horiz_2d_int( nzb_v_inner )
	1037	CALL exchange_horiz_2d_int( nzb_v_outer )
	1038	CALL exchange_horiz_2d_int( nzb_w_outer )
	1039	CALL exchange_horiz_2d_int( nzb_s_outer )
	1040
[49]	1041	!
	1042	!-- Allocate and set the arrays containing the topography height
	1043	IF ( myid == 0 ) THEN
	1044
	1045	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	1046
	1047	DO i = 0, nx + 1
	1048	DO j = 0, ny + 1
	1049	zu_s_inner(i,j) = zu(nzb_local(j,i))
	1050	zw_w_inner(i,j) = zw(nzb_local(j,i))
	1051	ENDDO
	1052	ENDDO
	1053
	1054	ENDIF
[1221]	1055	!
	1056	!-- Set flag arrays to be used for masking of grid points
	1057	DO i = nxlg, nxrg
	1058	DO j = nysg, nyng
	1059	DO k = nzb, nzt+1
[1353]	1060	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	1061	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	1062	ENDDO
	1063	ENDDO
	1064	ENDDO
[1804]	1065
[1]	1066	ENDIF
	1067
	1068	!
	1069	!-- Set the individual index arrays which define the k index from which on
	1070	!-- the usual finite difference form (which does not use surface fluxes) is
	1071	!-- applied
[1691]	1072	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	1073	nzb_diff_u = nzb_u_inner + 2
	1074	nzb_diff_v = nzb_v_inner + 2
	1075	nzb_diff_s_inner = nzb_s_inner + 2
	1076	nzb_diff_s_outer = nzb_s_outer + 2
	1077	ELSE
	1078	nzb_diff_u = nzb_u_inner + 1
	1079	nzb_diff_v = nzb_v_inner + 1
	1080	nzb_diff_s_inner = nzb_s_inner + 1
	1081	nzb_diff_s_outer = nzb_s_outer + 1
	1082	ENDIF
	1083
	1084	!
	1085	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	1086	!-- for limitation of near-wall mixing length l_wall further below
	1087	corner_nl = 0
	1088	corner_nr = 0
	1089	corner_sl = 0
	1090	corner_sr = 0
	1091	wall_l = 0
	1092	wall_n = 0
	1093	wall_r = 0
	1094	wall_s = 0
	1095
	1096	DO i = nxl, nxr
	1097	DO j = nys, nyn
	1098	!
	1099	!-- u-component
	1100	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1101	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1102	fym(j,i) = 0.0_wp
	1103	fyp(j,i) = 1.0_wp
[1]	1104	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1105	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1106	fym(j,i) = 1.0_wp
	1107	fyp(j,i) = 0.0_wp
[1]	1108	ENDIF
	1109	!
	1110	!-- v-component
	1111	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1112	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1113	fxm(j,i) = 0.0_wp
	1114	fxp(j,i) = 1.0_wp
[1]	1115	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1116	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1117	fxm(j,i) = 1.0_wp
	1118	fxp(j,i) = 0.0_wp
[1]	1119	ENDIF
	1120	!
	1121	!-- w-component, also used for scalars, separate arrays for shear
	1122	!-- production of tke
	1123	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1124	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1125	wall_w_y(j,i) = 1.0_wp
	1126	fwym(j,i) = 0.0_wp
	1127	fwyp(j,i) = 1.0_wp
[1]	1128	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1129	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1130	wall_w_y(j,i) = 1.0_wp
	1131	fwym(j,i) = 1.0_wp
	1132	fwyp(j,i) = 0.0_wp
[1]	1133	ENDIF
	1134	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1135	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1136	wall_w_x(j,i) = 1.0_wp
	1137	fwxm(j,i) = 0.0_wp
	1138	fwxp(j,i) = 1.0_wp
[1]	1139	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1140	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1141	wall_w_x(j,i) = 1.0_wp
	1142	fwxm(j,i) = 1.0_wp
	1143	fwxp(j,i) = 0.0_wp
[1]	1144	ENDIF
	1145	!
	1146	!-- Wall and corner locations inside buildings for limitation of
	1147	!-- near-wall mixing length l_wall
	1148	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1149
	1150	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1151
	1152	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1153	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1154	nzb_s_inner(j,i-1) ) + 1
	1155	ENDIF
	1156
	1157	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1158	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1159	nzb_s_inner(j,i+1) ) + 1
	1160	ENDIF
	1161
	1162	ENDIF
	1163
	1164	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1165
	1166	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1167	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1168	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1169	nzb_s_inner(j,i-1) ) + 1
	1170	ENDIF
	1171
	1172	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1173	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1174	nzb_s_inner(j,i+1) ) + 1
	1175	ENDIF
	1176
	1177	ENDIF
	1178
	1179	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1180	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1181	ENDIF
	1182
	1183	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1184	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1185	ENDIF
	1186
	1187	ENDDO
	1188	ENDDO
	1189
	1190	!
[1931]	1191	!-- Calculate wall flag arrays for the multigrid method.
	1192	!-- Please note, wall flags are only applied in the not cache-optimized
	1193	!-- version.
	1194	IF ( psolver == 'multigrid_noopt' ) THEN
[114]	1195	!
	1196	!-- Gridpoint increment of the current level
	1197	inc = 1
	1198
	1199	DO l = maximum_grid_level, 1 , -1
	1200
	1201	nxl_l = nxl_mg(l)
	1202	nxr_l = nxr_mg(l)
	1203	nys_l = nys_mg(l)
	1204	nyn_l = nyn_mg(l)
	1205	nzt_l = nzt_mg(l)
	1206
	1207	!
	1208	!-- Assign the flag level to be calculated
	1209	SELECT CASE ( l )
	1210	CASE ( 1 )
	1211	flags => wall_flags_1
	1212	CASE ( 2 )
	1213	flags => wall_flags_2
	1214	CASE ( 3 )
	1215	flags => wall_flags_3
	1216	CASE ( 4 )
	1217	flags => wall_flags_4
	1218	CASE ( 5 )
	1219	flags => wall_flags_5
	1220	CASE ( 6 )
	1221	flags => wall_flags_6
	1222	CASE ( 7 )
	1223	flags => wall_flags_7
	1224	CASE ( 8 )
	1225	flags => wall_flags_8
	1226	CASE ( 9 )
	1227	flags => wall_flags_9
	1228	CASE ( 10 )
	1229	flags => wall_flags_10
	1230	END SELECT
	1231
	1232	!
	1233	!-- Depending on the grid level, set the respective bits in case of
	1234	!-- neighbouring walls
	1235	!-- Bit 0: wall to the bottom
	1236	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1237	!-- Bit 2: wall to the south
	1238	!-- Bit 3: wall to the north
	1239	!-- Bit 4: wall to the left
	1240	!-- Bit 5: wall to the right
[116]	1241	!-- Bit 6: inside building
[114]	1242
	1243	flags = 0
	1244
[927]	1245	!
	1246	!-- In case of masking method, flags are not set and multigrid method
	1247	!-- works like FFT-solver
[1931]	1248	IF ( .NOT. masking_method ) THEN
[927]	1249
	1250	DO i = nxl_l-1, nxr_l+1
	1251	DO j = nys_l-1, nyn_l+1
	1252	DO k = nzb, nzt_l+1
[114]	1253
	1254	!
[927]	1255	!-- Inside/outside building (inside building does not need
	1256	!-- further tests for walls)
	1257	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1258
[927]	1259	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1260
[927]	1261	ELSE
[114]	1262	!
[927]	1263	!-- Bottom wall
	1264	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1265	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1266	ENDIF
[114]	1267	!
[927]	1268	!-- South wall
	1269	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1270	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1271	ENDIF
[114]	1272	!
[927]	1273	!-- North wall
	1274	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1275	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1276	ENDIF
[114]	1277	!
[927]	1278	!-- Left wall
	1279	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1280	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1281	ENDIF
[114]	1282	!
[927]	1283	!-- Right wall
	1284	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1285	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1286	ENDIF
	1287
[114]	1288	ENDIF
	1289
[927]	1290	ENDDO
[114]	1291	ENDDO
	1292	ENDDO
	1293
[927]	1294	ENDIF
	1295
[114]	1296	inc = inc * 2
	1297
	1298	ENDDO
	1299
	1300	ENDIF
[861]	1301	!
[1942]	1302	!-- Allocate flags needed for masking walls. Even though these flags are only
	1303	!-- required in the ws-scheme, the arrays need to be allocated as they are
	1304	!-- used in OpenACC directives.
[1677]	1305	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1306	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1307	wall_flags_0 = 0
	1308	wall_flags_00 = 0
[114]	1309	!
[1942]	1310	!-- Init flags for ws-scheme to degrade order near walls
	1311	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' .OR.&
	1312	scalar_advec == 'ws-scheme-mono' ) THEN
	1313	CALL ws_init_flags
[861]	1314	ENDIF
	1315
	1316	!
[1]	1317	!-- In case of topography: limit near-wall mixing length l_wall further:
	1318	!-- Go through all points of the subdomain one by one and look for the closest
	1319	!-- surface
	1320	IF ( TRIM(topography) /= 'flat' ) THEN
	1321	DO i = nxl, nxr
	1322	DO j = nys, nyn
	1323
	1324	nzb_si = nzb_s_inner(j,i)
	1325	vi = vertical_influence(nzb_si)
	1326
	1327	IF ( wall_n(j,i) > 0 ) THEN
	1328	!
	1329	!-- North wall (y distance)
	1330	DO k = wall_n(j,i), nzb_si
[1353]	1331	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1332	ENDDO
	1333	!
	1334	!-- Above North wall (yz distance)
	1335	DO k = nzb_si + 1, nzb_si + vi
[1353]	1336	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1337	SQRT( 0.25_wp * dy**2 + &
[1]	1338	( zu(k) - zw(nzb_si) )**2 ) )
	1339	ENDDO
	1340	!
	1341	!-- Northleft corner (xy distance)
	1342	IF ( corner_nl(j,i) > 0 ) THEN
	1343	DO k = corner_nl(j,i), nzb_si
	1344	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1345	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1346	ENDDO
	1347	!
	1348	!-- Above Northleft corner (xyz distance)
	1349	DO k = nzb_si + 1, nzb_si + vi
[1353]	1350	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1351	SQRT( 0.25_wp * (dx2 + dy2) + &
	1352	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1353	ENDDO
	1354	ENDIF
	1355	!
	1356	!-- Northright corner (xy distance)
	1357	IF ( corner_nr(j,i) > 0 ) THEN
	1358	DO k = corner_nr(j,i), nzb_si
[1353]	1359	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1360	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1361	ENDDO
	1362	!
	1363	!-- Above northright corner (xyz distance)
	1364	DO k = nzb_si + 1, nzb_si + vi
[1353]	1365	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1366	SQRT( 0.25_wp * (dx2 + dy2) + &
	1367	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1368	ENDDO
	1369	ENDIF
	1370	ENDIF
	1371
	1372	IF ( wall_s(j,i) > 0 ) THEN
	1373	!
	1374	!-- South wall (y distance)
	1375	DO k = wall_s(j,i), nzb_si
[1353]	1376	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1377	ENDDO
	1378	!
	1379	!-- Above south wall (yz distance)
[1353]	1380	DO k = nzb_si + 1, nzb_si + vi
	1381	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1382	SQRT( 0.25_wp * dy**2 + &
[1]	1383	( zu(k) - zw(nzb_si) )**2 ) )
	1384	ENDDO
	1385	!
	1386	!-- Southleft corner (xy distance)
	1387	IF ( corner_sl(j,i) > 0 ) THEN
	1388	DO k = corner_sl(j,i), nzb_si
[1353]	1389	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1390	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1391	ENDDO
	1392	!
	1393	!-- Above southleft corner (xyz distance)
	1394	DO k = nzb_si + 1, nzb_si + vi
[1353]	1395	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1396	SQRT( 0.25_wp * (dx2 + dy2) + &
	1397	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1398	ENDDO
	1399	ENDIF
	1400	!
	1401	!-- Southright corner (xy distance)
	1402	IF ( corner_sr(j,i) > 0 ) THEN
	1403	DO k = corner_sr(j,i), nzb_si
[1353]	1404	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1405	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1406	ENDDO
	1407	!
	1408	!-- Above southright corner (xyz distance)
	1409	DO k = nzb_si + 1, nzb_si + vi
[1353]	1410	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1411	SQRT( 0.25_wp * (dx2 + dy2) + &
	1412	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1413	ENDDO
	1414	ENDIF
	1415
	1416	ENDIF
	1417
	1418	IF ( wall_l(j,i) > 0 ) THEN
	1419	!
	1420	!-- Left wall (x distance)
	1421	DO k = wall_l(j,i), nzb_si
[1353]	1422	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1423	ENDDO
	1424	!
	1425	!-- Above left wall (xz distance)
	1426	DO k = nzb_si + 1, nzb_si + vi
[1353]	1427	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1428	SQRT( 0.25_wp * dx**2 + &
	1429	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1430	ENDDO
	1431	ENDIF
	1432
	1433	IF ( wall_r(j,i) > 0 ) THEN
	1434	!
	1435	!-- Right wall (x distance)
	1436	DO k = wall_r(j,i), nzb_si
[1353]	1437	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1438	ENDDO
	1439	!
	1440	!-- Above right wall (xz distance)
	1441	DO k = nzb_si + 1, nzb_si + vi
[1353]	1442	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1443	SQRT( 0.25_wp * dx**2 + &
[1]	1444	( zu(k) - zw(nzb_si) )**2 ) )
	1445	ENDDO
	1446
	1447	ENDIF
	1448
	1449	ENDDO
	1450	ENDDO
	1451
	1452	ENDIF
	1453
	1454	!
	1455	!-- Multiplication with wall_adjustment_factor
	1456	l_wall = wall_adjustment_factor * l_wall
	1457
	1458	!
[709]	1459	!-- Set lateral boundary conditions for l_wall
[667]	1460	CALL exchange_horiz( l_wall, nbgp )
	1461
[1]	1462	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1463	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1464
	1465
	1466	END SUBROUTINE init_grid

Note: See TracBrowser for help on using the repository browser.

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |