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source: palm/trunk/SOURCE/init_grid.f90 @ 1845

Last change on this file since 1845 was 1845, checked in by raasch, 8 years ago
nzb_2d replaced by nzb_..._inner, Kessler precipitation stored on surface grid point
Property svn:keywords set to `Id`
File size: 69.1 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	! -----------------
[1845]	21	! nzb_2d removed
[1805]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: init_grid.f90 1845 2016-04-08 08:29:13Z raasch $
	26	!
[1805]	27	! 1804 2016-04-05 16:30:18Z maronga
	28	! Removed code for parameter file check (__check)
	29	!
[1780]	30	! 1779 2016-03-03 08:01:28Z raasch
	31	! coupling_char is trimmed at every place it occurs, because it can have
	32	! different length now
	33	!
[1763]	34	! 1762 2016-02-25 12:31:13Z hellstea
	35	! Introduction of nested domain feature
	36	!
[1744]	37	! 1743 2016-01-13 10:23:51Z raasch
	38	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	39	! total domain
	40	!
[1692]	41	! 1691 2015-10-26 16:17:44Z maronga
	42	! Renamed prandtl_layer to constant_flux_layer.
	43	!
[1683]	44	! 1682 2015-10-07 23:56:08Z knoop
	45	! Code annotations made doxygen readable
	46	!
[1678]	47	! 1677 2015-10-02 13:25:23Z boeske
	48	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	49	!
[1676]	50	! 1675 2015-10-02 08:28:59Z gronemeier
	51	! Bugfix: Definition of topography grid levels
	52	!
[1662]	53	! 1660 2015-09-21 08:15:16Z gronemeier
	54	! Bugfix: Definition of topography grid levels if vertical grid stretching
	55	! starts below the maximum topography height.
	56	!
[1581]	57	! 1580 2015-04-10 13:43:49Z suehring
	58	! Bugfix: setting flags for 5th order scheme near buildings
	59	!
[1576]	60	! 1575 2015-03-27 09:56:27Z raasch
	61	! adjustments for psolver-queries
	62	!
[1558]	63	! 1557 2015-03-05 16:43:04Z suehring
	64	! Adjustment for monotoinic limiter
	65	!
[1419]	66	! 1418 2014-06-06 13:05:08Z fricke
	67	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	68	! condition and a negative value for dz_stretch_level the condition
	69	! was always true for the whole model domain
	70	!
[1410]	71	! 1409 2014-05-23 12:11:32Z suehring
	72	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	73	! j <= nysv
	74	!
[1354]	75	! 1353 2014-04-08 15:21:23Z heinze
	76	! REAL constants provided with KIND-attribute
	77	!
[1323]	78	! 1322 2014-03-20 16:38:49Z raasch
	79	! REAL constants defined as wp-kind
	80	!
[1321]	81	! 1320 2014-03-20 08:40:49Z raasch
[1320]	82	! ONLY-attribute added to USE-statements,
	83	! kind-parameters added to all INTEGER and REAL declaration statements,
	84	! kinds are defined in new module kinds,
	85	! revision history before 2012 removed,
	86	! comment fields (!:) to be used for variable explanations added to
	87	! all variable declaration statements
[1321]	88	!
[1222]	89	! 1221 2013-09-10 08:59:13Z raasch
	90	! wall_flags_00 introduced to hold bits 32-63,
	91	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	92	! loops optimized for openACC (pres + flow_statistics)
	93	!
[1093]	94	! 1092 2013-02-02 11:24:22Z raasch
	95	! unused variables removed
	96	!
[1070]	97	! 1069 2012-11-28 16:18:43Z maronga
[1779]	98	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	99	! ocean model in case of coupled runs
[1070]	100	!
[1037]	101	! 1036 2012-10-22 13:43:42Z raasch
	102	! code put under GPL (PALM 3.9)
	103	!
[1017]	104	! 1015 2012-09-27 09:23:24Z raasch
	105	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	106	! nzb_w_inner+1
	107	!
[997]	108	! 996 2012-09-07 10:41:47Z raasch
	109	! little reformatting
	110	!
[979]	111	! 978 2012-08-09 08:28:32Z fricke
	112	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	113	! Bugfix: Set wall_flags_0 for inflow boundary
	114	!
[928]	115	! 927 2012-06-06 19:15:04Z raasch
	116	! Wall flags are not set for multigrid method in case of masking method
	117	!
[865]	118	! 864 2012-03-27 15:10:33Z gryschka
[927]	119	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	120	! were not correctly defined for k=1.
[865]	121	!
[863]	122	! 861 2012-03-26 14:18:34Z suehring
[861]	123	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	124	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	125	! model domain.!
[861]	126	! Initialization of nzb_s_inner and nzb_w_inner.
	127	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	128	! while setting wall_flags_0
	129	!
[844]	130	! 843 2012-02-29 15:16:21Z gryschka
	131	! In case of ocean and dirichlet bc for u and v at the bottom
	132	! the first u-level ist defined at same height as the first w-level
	133	!
[819]	134	! 818 2012-02-08 16:11:23Z maronga
	135	! Bugfix: topo_height is only required if topography is used. It is thus now
	136	! allocated in the topography branch
	137	!
[810]	138	! 809 2012-01-30 13:32:58Z maronga
	139	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	140	!
[808]	141	! 807 2012-01-25 11:53:51Z maronga
	142	! New cpp directive "__check" implemented which is used by check_namelist_files
	143	!
[1]	144	! Revision 1.1 1997/08/11 06:17:45 raasch
	145	! Initial revision (Testversion)
	146	!
	147	!
	148	! Description:
	149	! ------------
[1682]	150	!> Creating grid depending constants
[1]	151	!------------------------------------------------------------------------------!
[1682]	152	SUBROUTINE init_grid
	153
[1]	154
[1320]	155	USE arrays_3d, &
	156	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	157	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	158
[1353]	159	USE control_parameters, &
[1320]	160	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	161	building_length_y, building_wall_left, building_wall_south, &
	162	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	163	canyon_width_x, canyon_width_y, constant_flux_layer, &
	164	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	165	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	166	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	167	masking_method, maximum_grid_level, message_string, &
[1762]	168	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	169	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
	170	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	171	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	172	wall_adjustment_factor
[1320]	173
	174	USE grid_variables, &
	175	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	176	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	177	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	178
	179	USE indices, &
	180	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	181	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
[1845]	182	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
	183	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
	184	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
	185	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
[1320]	186	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	187	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	188	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	189	wall_flags_9
	190
	191	USE kinds
	192
[1]	193	USE pegrid
	194
	195	IMPLICIT NONE
	196
[1682]	197	INTEGER(iwp) :: bh !<
	198	INTEGER(iwp) :: blx !<
	199	INTEGER(iwp) :: bly !<
	200	INTEGER(iwp) :: bxl !<
	201	INTEGER(iwp) :: bxr !<
	202	INTEGER(iwp) :: byn !<
	203	INTEGER(iwp) :: bys !<
	204	INTEGER(iwp) :: ch !<
	205	INTEGER(iwp) :: cwx !<
	206	INTEGER(iwp) :: cwy !<
	207	INTEGER(iwp) :: cxl !<
	208	INTEGER(iwp) :: cxr !<
	209	INTEGER(iwp) :: cyn !<
	210	INTEGER(iwp) :: cys !<
	211	INTEGER(iwp) :: gls !<
	212	INTEGER(iwp) :: i !<
	213	INTEGER(iwp) :: ii !<
	214	INTEGER(iwp) :: inc !<
	215	INTEGER(iwp) :: j !<
	216	INTEGER(iwp) :: k !<
	217	INTEGER(iwp) :: l !<
	218	INTEGER(iwp) :: nxl_l !<
	219	INTEGER(iwp) :: nxr_l !<
	220	INTEGER(iwp) :: nyn_l !<
	221	INTEGER(iwp) :: nys_l !<
	222	INTEGER(iwp) :: nzb_si !<
	223	INTEGER(iwp) :: nzt_l !<
	224	INTEGER(iwp) :: vi !<
[1]	225
[1682]	226	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
[1]	227
[1682]	228	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
	229	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
	230	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
	231	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
	232	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
	233	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
	234	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
	235	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
	236	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
	237	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
[1]	238
[1682]	239	LOGICAL :: flag_set = .FALSE. !<
[861]	240
[1682]	241	REAL(wp) :: dx_l !<
	242	REAL(wp) :: dy_l !<
	243	REAL(wp) :: dz_stretched !<
[1]	244
[1682]	245	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
[1]	246
[667]	247
[1]	248	!
[709]	249	!-- Calculation of horizontal array bounds including ghost layers
[667]	250	nxlg = nxl - nbgp
	251	nxrg = nxr + nbgp
	252	nysg = nys - nbgp
	253	nyng = nyn + nbgp
[709]	254
[667]	255	!
[1]	256	!-- Allocate grid arrays
[1353]	257	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	258	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	259
	260	!
	261	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	262	IF ( dz == -1.0_wp ) THEN
[254]	263	message_string = 'missing dz'
	264	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	265	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	266	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	267	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	268	ENDIF
[94]	269
[1]	270	!
[94]	271	!-- Define the vertical grid levels
	272	IF ( .NOT. ocean ) THEN
	273	!
	274	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	275	!-- The second u-level (k=1) corresponds to the top of the
[94]	276	!-- Prandtl-layer.
[667]	277
	278	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	279	zu(0) = 0.0_wp
	280	! zu(0) = - dz * 0.5_wp
[667]	281	ELSE
[1353]	282	zu(0) = - dz * 0.5_wp
[667]	283	ENDIF
[1353]	284	zu(1) = dz * 0.5_wp
[1]	285
[94]	286	dz_stretch_level_index = nzt+1
	287	dz_stretched = dz
	288	DO k = 2, nzt+1
	289	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	290	dz_stretched = dz_stretched * dz_stretch_factor
	291	dz_stretched = MIN( dz_stretched, dz_max )
	292	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	293	ENDIF
	294	zu(k) = zu(k-1) + dz_stretched
	295	ENDDO
[1]	296
	297	!
[94]	298	!-- Compute the w-levels. They are always staggered half-way between the
[843]	299	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	300	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	301	!-- The top w-level is extrapolated linearly.
[1353]	302	zw(0) = 0.0_wp
[94]	303	DO k = 1, nzt
[1353]	304	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	305	ENDDO
[1353]	306	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	307
[94]	308	ELSE
[1]	309	!
[843]	310	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	311	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	312	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	313	!-- w-level are defined at same height, but staggered from the second level.
	314	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	315	zu(nzt+1) = dz * 0.5_wp
	316	zu(nzt) = - dz * 0.5_wp
[94]	317
	318	dz_stretch_level_index = 0
	319	dz_stretched = dz
	320	DO k = nzt-1, 0, -1
[1418]	321	!
	322	!-- The default value of dz_stretch_level is positive, thus the first
	323	!-- condition is always true. Hence, the second condition is necessary.
	324	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	325	.AND. dz_stretched < dz_max ) THEN
[94]	326	dz_stretched = dz_stretched * dz_stretch_factor
	327	dz_stretched = MIN( dz_stretched, dz_max )
	328	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	329	ENDIF
	330	zu(k) = zu(k+1) - dz_stretched
	331	ENDDO
	332
	333	!
	334	!-- Compute the w-levels. They are always staggered half-way between the
[843]	335	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	336	!-- at the ground. In this case the first u- and w-level are defined at
	337	!-- same height. The top w-level (nzt+1) is not used but set for
	338	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	339	zw(nzt+1) = dz
[1353]	340	zw(nzt) = 0.0_wp
[94]	341	DO k = 0, nzt
[1353]	342	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	343	ENDDO
	344
[843]	345	!
	346	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	347	!-- at same height.
	348	IF ( ibc_uv_b == 0 ) THEN
	349	zu(0) = zw(0)
	350	ENDIF
	351
[94]	352	ENDIF
	353
	354	!
[1]	355	!-- Compute grid lengths.
	356	DO k = 1, nzt+1
	357	dzu(k) = zu(k) - zu(k-1)
[1353]	358	ddzu(k) = 1.0_wp / dzu(k)
[1]	359	dzw(k) = zw(k) - zw(k-1)
[1353]	360	ddzw(k) = 1.0_wp / dzw(k)
[1]	361	ENDDO
	362
	363	DO k = 1, nzt
[1353]	364	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	365	ENDDO
[667]	366
	367	!
[709]	368	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	369	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	370	!-- is only dz/2, but should be dz. Therefore, an additional array
	371	!-- containing with appropriate grid information is created for these
	372	!-- solvers.
[1575]	373	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	374	ALLOCATE( ddzu_pres(1:nzt+1) )
	375	ddzu_pres = ddzu
[864]	376	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	377	ENDIF
[1]	378
	379	!
	380	!-- In case of multigrid method, compute grid lengths and grid factors for the
	381	!-- grid levels
[1575]	382	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	383
	384	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	385	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	386	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	387	f1_mg(nzb+1:nzt,maximum_grid_level), &
	388	f2_mg(nzb+1:nzt,maximum_grid_level), &
	389	f3_mg(nzb+1:nzt,maximum_grid_level) )
	390
	391	dzu_mg(:,maximum_grid_level) = dzu
[667]	392	!
[864]	393	!-- Next line to ensure an equally spaced grid.
	394	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	395
[1]	396	dzw_mg(:,maximum_grid_level) = dzw
	397	nzt_l = nzt
	398	DO l = maximum_grid_level-1, 1, -1
[1353]	399	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	400	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	401	nzt_l = nzt_l / 2
	402	DO k = 2, nzt_l+1
	403	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	404	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	405	ENDDO
	406	ENDDO
	407
	408	nzt_l = nzt
	409	dx_l = dx
	410	dy_l = dy
	411	DO l = maximum_grid_level, 1, -1
[1353]	412	ddx2_mg(l) = 1.0_wp / dx_l**2
	413	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	414	DO k = nzb+1, nzt_l
[1353]	415	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	416	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	417	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	418	f2_mg(k,l) + f3_mg(k,l)
	419	ENDDO
	420	nzt_l = nzt_l / 2
[1353]	421	dx_l = dx_l * 2.0_wp
	422	dy_l = dy_l * 2.0_wp
[1]	423	ENDDO
	424
	425	ENDIF
	426
	427	!
	428	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	429	ddx = 1.0_wp / dx
	430	ddy = 1.0_wp / dy
[1]	431	dx2 = dx * dx
	432	dy2 = dy * dy
[1353]	433	ddx2 = 1.0_wp / dx2
	434	ddy2 = 1.0_wp / dy2
[1]	435
	436	!
	437	!-- Compute the grid-dependent mixing length.
	438	DO k = 1, nzt
[1322]	439	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	440	ENDDO
	441
	442	!
	443	!-- Allocate outer and inner index arrays for topography and set
[114]	444	!-- defaults.
	445	!-- nzb_local has to contain additional layers of ghost points for calculating
	446	!-- the flag arrays needed for the multigrid method
	447	gls = 2**( maximum_grid_level )
[861]	448	IF ( gls < nbgp ) gls = nbgp
[667]	449
[114]	450	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	451	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	452	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	453	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	454	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	455	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	456	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	457	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	458	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	459	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	460	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	461	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	462	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	463	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	464	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	465	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	466	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	467	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	468	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	469	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	470	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	471	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
[1221]	472	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	473	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	474	wall_e_x(nysg:nyng,nxlg:nxrg), &
	475	wall_e_y(nysg:nyng,nxlg:nxrg), &
	476	wall_u(nysg:nyng,nxlg:nxrg), &
	477	wall_v(nysg:nyng,nxlg:nxrg), &
	478	wall_w_x(nysg:nyng,nxlg:nxrg), &
	479	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	480
	481
[667]	482
	483	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	484
[818]	485
[1]	486	nzb_s_inner = nzb; nzb_s_outer = nzb
	487	nzb_u_inner = nzb; nzb_u_outer = nzb
	488	nzb_v_inner = nzb; nzb_v_outer = nzb
	489	nzb_w_inner = nzb; nzb_w_outer = nzb
	490
[1353]	491	rflags_s_inner = 1.0_wp
	492	rflags_invers = 1.0_wp
[1221]	493
[1]	494	!
[19]	495	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	496	!-- form (which does not use surface fluxes) is applied
[1691]	497	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	498	nzb_diff = nzb + 2
	499	ELSE
	500	nzb_diff = nzb + 1
	501	ENDIF
[19]	502	IF ( use_top_fluxes ) THEN
	503	nzt_diff = nzt - 1
	504	ELSE
	505	nzt_diff = nzt
	506	ENDIF
[1]	507
	508	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	509	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	510
[1353]	511	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	512	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	513	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	514	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	515
	516	!
	517	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	518	!-- for the moment,
	519	!-- multiplication with wall_adjustment_factor near the end of this routine
	520	l_wall(nzb,:,:) = l_grid(1)
	521	DO k = nzb+1, nzt
	522	l_wall(k,:,:) = l_grid(k)
	523	ENDDO
	524	l_wall(nzt+1,:,:) = l_grid(nzt)
	525
	526	ALLOCATE ( vertical_influence(nzb:nzt) )
	527	DO k = 1, nzt
	528	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	529	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	530	ENDDO
	531
	532	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	533	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	534	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	535	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	536	'threshold given by only local', &
	537	' &horizontal reduction of near_wall ', &
	538	'mixing length l_wall', &
	539	' &starting from height level k = ', k, '.'
	540	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	541	EXIT
	542	ENDIF
	543	ENDDO
	544	vertical_influence(0) = vertical_influence(1)
	545
[667]	546	DO i = nxlg, nxrg
	547	DO j = nysg, nyng
[1]	548	DO k = nzb_s_inner(j,i) + 1, &
	549	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	550	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	551	ENDDO
	552	ENDDO
	553	ENDDO
	554
	555	!
	556	!-- Set outer and inner index arrays for non-flat topography.
	557	!-- Here consistency checks concerning domain size and periodicity are
	558	!-- necessary.
	559	!-- Within this SELECT CASE structure only nzb_local is initialized
	560	!-- individually depending on the chosen topography type, all other index
	561	!-- arrays are initialized further below.
	562	SELECT CASE ( TRIM( topography ) )
	563
	564	CASE ( 'flat' )
	565	!
[555]	566	!-- nzb_local is required for the multigrid solver
	567	nzb_local = 0
[1]	568
	569	CASE ( 'single_building' )
	570	!
	571	!-- Single rectangular building, by default centered in the middle of the
	572	!-- total domain
	573	blx = NINT( building_length_x / dx )
	574	bly = NINT( building_length_y / dy )
[1675]	575	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	576	IF ( ABS( zw(bh ) - building_height ) == &
	577	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	578
[1322]	579	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	580	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	581	ENDIF
	582	bxl = NINT( building_wall_left / dx )
	583	bxr = bxl + blx
	584
[1322]	585	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	586	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	587	ENDIF
	588	bys = NINT( building_wall_south / dy )
	589	byn = bys + bly
	590
	591	!
	592	!-- Building size has to meet some requirements
	593	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	594	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	595	WRITE( message_string, * ) 'inconsistent building parameters:', &
	596	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	597	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	598	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	599	ENDIF
	600
	601	!
[217]	602	!-- Define the building.
[1]	603	nzb_local = 0
[134]	604	nzb_local(bys:byn,bxl:bxr) = bh
[1]	605
[240]	606	CASE ( 'single_street_canyon' )
	607	!
	608	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	609	!-- The canyon is centered in the other direction by default.
[1322]	610	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	611	!
	612	!-- Street canyon in y direction
	613	cwx = NINT( canyon_width_x / dx )
[1322]	614	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	615	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	616	ENDIF
	617	cxl = NINT( canyon_wall_left / dx )
	618	cxr = cxl + cwx
	619
[1322]	620	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	621	!
	622	!-- Street canyon in x direction
	623	cwy = NINT( canyon_width_y / dy )
[1322]	624	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	625	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	626	ENDIF
	627	cys = NINT( canyon_wall_south / dy )
	628	cyn = cys + cwy
	629
	630	ELSE
[254]	631
	632	message_string = 'no street canyon width given'
	633	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	634
[240]	635	ENDIF
	636
[1675]	637	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	638	IF ( ABS( zw(ch ) - canyon_height ) == &
	639	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	640
[240]	641	dp_level_ind_b = ch
	642	!
	643	!-- Street canyon size has to meet some requirements
[1322]	644	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	645	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	646	( ch < 3 ) ) THEN
[1353]	647	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	648	'&cxl=', cxl, 'cxr=', cxr, &
	649	'cwx=', cwx, &
[254]	650	'ch=', ch, 'nx=', nx, 'ny=', ny
	651	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	652	ENDIF
[1322]	653	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	654	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	655	( ch < 3 ) ) THEN
[1353]	656	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	657	'&cys=', cys, 'cyn=', cyn, &
	658	'cwy=', cwy, &
[254]	659	'ch=', ch, 'nx=', nx, 'ny=', ny
	660	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	661	ENDIF
	662	ENDIF
[1353]	663	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	664	canyon_width_y /= 9999999.9_wp ) THEN
	665	message_string = 'inconsistent canyon parameters:' // &
	666	'&street canyon can only be oriented' // &
[254]	667	'&either in x- or in y-direction'
	668	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	669	ENDIF
	670
	671	nzb_local = ch
[1322]	672	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	673	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	674	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	675	nzb_local(cys+1:cyn-1,:) = 0
	676	ENDIF
	677
[1]	678	CASE ( 'read_from_file' )
[759]	679
[818]	680	ALLOCATE ( topo_height(0:ny,0:nx) )
	681
[759]	682	DO ii = 0, io_blocks-1
	683	IF ( ii == io_group ) THEN
	684
[1]	685	!
[759]	686	!-- Arbitrary irregular topography data in PALM format (exactly
	687	!-- matching the grid size and total domain size)
[1779]	688	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	689	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[759]	690	DO j = ny, 0, -1
	691	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	692	ENDDO
	693
	694	GOTO 12
	695
[1779]	696	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	697	' does not exist'
[759]	698	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	699
[1779]	700	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	701	TRIM( coupling_char )
[759]	702	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	703
	704	12 CLOSE( 90 )
	705
	706	ENDIF
[1804]	707	#if defined( __parallel )
[759]	708	CALL MPI_BARRIER( comm2d, ierr )
	709	#endif
[559]	710	ENDDO
[759]	711
[1]	712	!
	713	!-- Calculate the index height of the topography
	714	DO i = 0, nx
	715	DO j = 0, ny
[1675]	716	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	717	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	718	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	719	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	720	ENDDO
	721	ENDDO
[818]	722
	723	DEALLOCATE ( topo_height )
[114]	724	!
[759]	725	!-- Add cyclic boundaries (additional layers are for calculating
	726	!-- flag arrays needed for the multigrid sover)
[114]	727	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	728	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	729	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	730	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	731
[1]	732	CASE DEFAULT
	733	!
	734	!-- The DEFAULT case is reached either if the parameter topography
[217]	735	!-- contains a wrong character string or if the user has defined a special
[1]	736	!-- case in the user interface. There, the subroutine user_init_grid
	737	!-- checks which of these two conditions applies.
[114]	738	CALL user_init_grid( gls, nzb_local )
[1]	739
	740	END SELECT
	741	!
[861]	742	!-- Determine the maximum level of topography. Furthermore it is used for
	743	!-- steering the degradation of order of the applied advection scheme.
[978]	744	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	745	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	746	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	747	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	748	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	749	nest_domain ) &
	750	THEN
	751	nzb_max = nzt
[978]	752	ENDIF
	753
[861]	754	!
[1]	755	!-- Consistency checks and index array initialization are only required for
[217]	756	!-- non-flat topography, also the initialization of topography height arrays
[49]	757	!-- zu_s_inner and zw_w_inner
[1]	758	IF ( TRIM( topography ) /= 'flat' ) THEN
	759
	760	!
	761	!-- Consistency checks
	762	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	763	WRITE( message_string, * ) 'nzb_local values are outside the', &
	764	'model domain', &
	765	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	766	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	767	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	768	ENDIF
	769
[722]	770	IF ( bc_lr == 'cyclic' ) THEN
[1353]	771	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	772	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	773	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	774	' boundary condition in x-direction'
	775	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	776	ENDIF
	777	ENDIF
[722]	778	IF ( bc_ns == 'cyclic' ) THEN
[1353]	779	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	780	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	781	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	782	' boundary condition in y-direction'
	783	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	784	ENDIF
	785	ENDIF
	786
[217]	787	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	788	!
[217]	789	!-- The array nzb_local as defined using the 'cell_edge' convention
	790	!-- describes the actual total size of topography which is defined at the
	791	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	792	!-- on the topography walls in y-direction. However, PALM uses individual
	793	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	794	!-- Therefore, the extent of topography in nzb_local is now reduced by
	795	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	796	!-- to form the basis for nzb_s_inner.
	797	DO j = -gls, ny + gls
	798	DO i = -gls, nx
	799	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	800	ENDDO
[134]	801	ENDDO
[217]	802	!-- apply cyclic boundary conditions in x-direction
	803	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	804	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	805	DO i = -gls, nx + gls
	806	DO j = -gls, ny
	807	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	808	ENDDO
[134]	809	ENDDO
[217]	810	!-- apply cyclic boundary conditions in y-direction
	811	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	812	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	813	ENDIF
[134]	814
[1]	815	!
	816	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	817	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	818	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	819
	820	!
	821	!-- Initialize remaining index arrays:
	822	!-- first pre-initialize them with nzb_s_inner...
	823	nzb_u_inner = nzb_s_inner
	824	nzb_u_outer = nzb_s_inner
	825	nzb_v_inner = nzb_s_inner
	826	nzb_v_outer = nzb_s_inner
	827	nzb_w_outer = nzb_s_inner
	828	nzb_s_outer = nzb_s_inner
	829
	830	!
	831	!-- ...then extend pre-initialized arrays in their according directions
	832	!-- based on nzb_local using nzb_tmp as a temporary global index array
	833
	834	!
	835	!-- nzb_s_outer:
	836	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	837	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	838	DO j = -1, ny + 1
	839	DO i = 0, nx
[1353]	840	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	841	nzb_local(j,i+1) )
	842	ENDDO
	843	ENDDO
	844	DO i = nxl, nxr
	845	DO j = nys, nyn
[1353]	846	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	847	nzb_tmp(j+1,i) )
	848	ENDDO
	849	!
	850	!-- non-cyclic boundary conditions (overwritten by call of
	851	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	852	IF ( nys == 0 ) THEN
	853	j = -1
	854	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	855	ENDIF
[1743]	856	IF ( nyn == ny ) THEN
[1]	857	j = ny + 1
	858	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	859	ENDIF
	860	ENDDO
	861	!
	862	!-- nzb_w_outer:
	863	!-- identical to nzb_s_outer
	864	nzb_w_outer = nzb_s_outer
	865
	866	!
	867	!-- nzb_u_inner:
	868	!-- extend nzb_local rightwards only
[667]	869	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	870	DO j = -1, ny + 1
	871	DO i = 0, nx + 1
	872	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	873	ENDDO
	874	ENDDO
[667]	875	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	876
	877	!
	878	!-- nzb_u_outer:
	879	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	880	DO i = nxl, nxr
	881	DO j = nys, nyn
[1353]	882	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	883	nzb_tmp(j+1,i) )
	884	ENDDO
	885	!
	886	!-- non-cyclic boundary conditions (overwritten by call of
	887	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	888	IF ( nys == 0 ) THEN
	889	j = -1
	890	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	891	ENDIF
[1743]	892	IF ( nyn == ny ) THEN
[1]	893	j = ny + 1
	894	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	895	ENDIF
	896	ENDDO
	897
	898	!
	899	!-- nzb_v_inner:
	900	!-- extend nzb_local northwards only
[667]	901	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	902	DO i = -1, nx + 1
	903	DO j = 0, ny + 1
	904	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	905	ENDDO
	906	ENDDO
[667]	907	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	908
	909	!
	910	!-- nzb_v_outer:
	911	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	912	DO j = nys, nyn
	913	DO i = nxl, nxr
[1353]	914	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	915	nzb_tmp(j,i+1) )
	916	ENDDO
	917	!
	918	!-- non-cyclic boundary conditions (overwritten by call of
	919	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	920	IF ( nxl == 0 ) THEN
	921	i = -1
	922	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	923	ENDIF
	924	IF ( nxr == nx ) THEN
	925	i = nx + 1
	926	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	927	ENDIF
	928	ENDDO
[1804]	929
[1]	930	!
	931	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	932	!-- boundary conditions, if applicable.
	933	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	934	!-- they do not require exchange and are not included here.
	935	CALL exchange_horiz_2d_int( nzb_u_inner )
	936	CALL exchange_horiz_2d_int( nzb_u_outer )
	937	CALL exchange_horiz_2d_int( nzb_v_inner )
	938	CALL exchange_horiz_2d_int( nzb_v_outer )
	939	CALL exchange_horiz_2d_int( nzb_w_outer )
	940	CALL exchange_horiz_2d_int( nzb_s_outer )
	941
[49]	942	!
	943	!-- Allocate and set the arrays containing the topography height
	944	IF ( myid == 0 ) THEN
	945
	946	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	947
	948	DO i = 0, nx + 1
	949	DO j = 0, ny + 1
	950	zu_s_inner(i,j) = zu(nzb_local(j,i))
	951	zw_w_inner(i,j) = zw(nzb_local(j,i))
	952	ENDDO
	953	ENDDO
	954
	955	ENDIF
[1221]	956	!
	957	!-- Set flag arrays to be used for masking of grid points
	958	DO i = nxlg, nxrg
	959	DO j = nysg, nyng
	960	DO k = nzb, nzt+1
[1353]	961	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	962	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	963	ENDDO
	964	ENDDO
	965	ENDDO
[1804]	966
[1]	967	ENDIF
	968
	969	!
	970	!-- Set the individual index arrays which define the k index from which on
	971	!-- the usual finite difference form (which does not use surface fluxes) is
	972	!-- applied
[1691]	973	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	974	nzb_diff_u = nzb_u_inner + 2
	975	nzb_diff_v = nzb_v_inner + 2
	976	nzb_diff_s_inner = nzb_s_inner + 2
	977	nzb_diff_s_outer = nzb_s_outer + 2
	978	ELSE
	979	nzb_diff_u = nzb_u_inner + 1
	980	nzb_diff_v = nzb_v_inner + 1
	981	nzb_diff_s_inner = nzb_s_inner + 1
	982	nzb_diff_s_outer = nzb_s_outer + 1
	983	ENDIF
	984
	985	!
	986	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	987	!-- for limitation of near-wall mixing length l_wall further below
	988	corner_nl = 0
	989	corner_nr = 0
	990	corner_sl = 0
	991	corner_sr = 0
	992	wall_l = 0
	993	wall_n = 0
	994	wall_r = 0
	995	wall_s = 0
	996
	997	DO i = nxl, nxr
	998	DO j = nys, nyn
	999	!
	1000	!-- u-component
	1001	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1002	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1003	fym(j,i) = 0.0_wp
	1004	fyp(j,i) = 1.0_wp
[1]	1005	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1006	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1007	fym(j,i) = 1.0_wp
	1008	fyp(j,i) = 0.0_wp
[1]	1009	ENDIF
	1010	!
	1011	!-- v-component
	1012	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1013	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1014	fxm(j,i) = 0.0_wp
	1015	fxp(j,i) = 1.0_wp
[1]	1016	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1017	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1018	fxm(j,i) = 1.0_wp
	1019	fxp(j,i) = 0.0_wp
[1]	1020	ENDIF
	1021	!
	1022	!-- w-component, also used for scalars, separate arrays for shear
	1023	!-- production of tke
	1024	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1025	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1026	wall_w_y(j,i) = 1.0_wp
	1027	fwym(j,i) = 0.0_wp
	1028	fwyp(j,i) = 1.0_wp
[1]	1029	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1030	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1031	wall_w_y(j,i) = 1.0_wp
	1032	fwym(j,i) = 1.0_wp
	1033	fwyp(j,i) = 0.0_wp
[1]	1034	ENDIF
	1035	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1036	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1037	wall_w_x(j,i) = 1.0_wp
	1038	fwxm(j,i) = 0.0_wp
	1039	fwxp(j,i) = 1.0_wp
[1]	1040	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1041	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1042	wall_w_x(j,i) = 1.0_wp
	1043	fwxm(j,i) = 1.0_wp
	1044	fwxp(j,i) = 0.0_wp
[1]	1045	ENDIF
	1046	!
	1047	!-- Wall and corner locations inside buildings for limitation of
	1048	!-- near-wall mixing length l_wall
	1049	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1050
	1051	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1052
	1053	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1054	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1055	nzb_s_inner(j,i-1) ) + 1
	1056	ENDIF
	1057
	1058	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1059	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1060	nzb_s_inner(j,i+1) ) + 1
	1061	ENDIF
	1062
	1063	ENDIF
	1064
	1065	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1066
	1067	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1068	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1069	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1070	nzb_s_inner(j,i-1) ) + 1
	1071	ENDIF
	1072
	1073	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1074	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1075	nzb_s_inner(j,i+1) ) + 1
	1076	ENDIF
	1077
	1078	ENDIF
	1079
	1080	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1081	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1082	ENDIF
	1083
	1084	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1085	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1086	ENDIF
	1087
	1088	ENDDO
	1089	ENDDO
	1090
	1091	!
[114]	1092	!-- Calculate wall flag arrays for the multigrid method
[1575]	1093	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1094	!
	1095	!-- Gridpoint increment of the current level
	1096	inc = 1
	1097
	1098	DO l = maximum_grid_level, 1 , -1
	1099
	1100	nxl_l = nxl_mg(l)
	1101	nxr_l = nxr_mg(l)
	1102	nys_l = nys_mg(l)
	1103	nyn_l = nyn_mg(l)
	1104	nzt_l = nzt_mg(l)
	1105
	1106	!
	1107	!-- Assign the flag level to be calculated
	1108	SELECT CASE ( l )
	1109	CASE ( 1 )
	1110	flags => wall_flags_1
	1111	CASE ( 2 )
	1112	flags => wall_flags_2
	1113	CASE ( 3 )
	1114	flags => wall_flags_3
	1115	CASE ( 4 )
	1116	flags => wall_flags_4
	1117	CASE ( 5 )
	1118	flags => wall_flags_5
	1119	CASE ( 6 )
	1120	flags => wall_flags_6
	1121	CASE ( 7 )
	1122	flags => wall_flags_7
	1123	CASE ( 8 )
	1124	flags => wall_flags_8
	1125	CASE ( 9 )
	1126	flags => wall_flags_9
	1127	CASE ( 10 )
	1128	flags => wall_flags_10
	1129	END SELECT
	1130
	1131	!
	1132	!-- Depending on the grid level, set the respective bits in case of
	1133	!-- neighbouring walls
	1134	!-- Bit 0: wall to the bottom
	1135	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1136	!-- Bit 2: wall to the south
	1137	!-- Bit 3: wall to the north
	1138	!-- Bit 4: wall to the left
	1139	!-- Bit 5: wall to the right
[116]	1140	!-- Bit 6: inside building
[114]	1141
	1142	flags = 0
	1143
[927]	1144	!
	1145	!-- In case of masking method, flags are not set and multigrid method
	1146	!-- works like FFT-solver
	1147	IF ( .NOT. masking_method ) THEN
	1148
	1149	DO i = nxl_l-1, nxr_l+1
	1150	DO j = nys_l-1, nyn_l+1
	1151	DO k = nzb, nzt_l+1
[114]	1152
	1153	!
[927]	1154	!-- Inside/outside building (inside building does not need
	1155	!-- further tests for walls)
	1156	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1157
[927]	1158	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1159
[927]	1160	ELSE
[114]	1161	!
[927]	1162	!-- Bottom wall
	1163	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1164	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1165	ENDIF
[114]	1166	!
[927]	1167	!-- South wall
	1168	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1169	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1170	ENDIF
[114]	1171	!
[927]	1172	!-- North wall
	1173	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1174	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1175	ENDIF
[114]	1176	!
[927]	1177	!-- Left wall
	1178	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1179	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1180	ENDIF
[114]	1181	!
[927]	1182	!-- Right wall
	1183	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1184	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1185	ENDIF
	1186
[114]	1187	ENDIF
	1188
[927]	1189	ENDDO
[114]	1190	ENDDO
	1191	ENDDO
	1192
[927]	1193	ENDIF
	1194
[114]	1195	!
	1196	!-- Test output of flag arrays
[145]	1197	! i = nxl_l
	1198	! WRITE (9,*) ' '
	1199	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1200	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1201	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1202	! DO k = nzt_l+1, nzb, -1
	1203	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1204	! ENDDO
[114]	1205
	1206	inc = inc * 2
	1207
	1208	ENDDO
	1209
	1210	ENDIF
[861]	1211	!
	1212	!-- Allocate flags needed for masking walls.
[1677]	1213	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1214	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1215	wall_flags_0 = 0
	1216	wall_flags_00 = 0
[114]	1217
[1557]	1218	IF ( scalar_advec == 'ws-scheme' .OR. &
	1219	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1220	!
[861]	1221	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1222	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1223	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1224	!-- grid points.
	1225	DO i = nxl, nxr
	1226	DO j = nys, nyn
	1227	DO k = nzb_s_inner(j,i)+1, nzt
	1228	!
	1229	!-- scalar - x-direction
	1230	!-- WS1 (0), WS3 (1), WS5 (2)
[1762]	1231	IF ( k <= nzb_s_inner(j,i+1) .OR. &
	1232	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1233	.AND. i == nxl ) .OR. &
	1234	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1235	.AND. i == nxr ) ) &
	1236	THEN
[861]	1237	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1238	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[1762]	1239	.OR. &
	1240	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1241	.AND. i == nxr-1 ) .OR. &
	1242	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1243	.AND. i == nxlu ) ) &
	1244	THEN
[861]	1245	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1246	ELSE
	1247	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1248	ENDIF
	1249	!
	1250	!-- scalar - y-direction
	1251	!-- WS1 (3), WS3 (4), WS5 (5)
[1762]	1252	IF ( k <= nzb_s_inner(j+1,i) .OR. &
	1253	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1254	.AND. j == nys ) .OR. &
	1255	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1256	.AND. j == nyn ) ) &
	1257	THEN
[861]	1258	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
[1762]	1259	!
[861]	1260	!-- WS3
	1261	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[1762]	1262	.OR. &
	1263	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1264	.AND. j == nysv ) .OR. &
	1265	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1266	.AND. j == nyn-1 ) ) &
	1267	THEN
[861]	1268	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
[1762]	1269	!
[861]	1270	!-- WS5
	1271	ELSE
	1272	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1273	ENDIF
	1274	!
	1275	!-- scalar - z-direction
	1276	!-- WS1 (6), WS3 (7), WS5 (8)
	1277	flag_set = .FALSE.
	1278	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1279	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1280	flag_set = .TRUE.
	1281	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1282	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1283	flag_set = .TRUE.
	1284	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1285	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1286	ENDIF
	1287	ENDDO
	1288	ENDDO
	1289	ENDDO
	1290	ENDIF
	1291
	1292	IF ( momentum_advec == 'ws-scheme' ) THEN
	1293	!
	1294	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1295	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1296	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1297	!-- grid points.
	1298	DO i = nxl, nxr
	1299	DO j = nys, nyn
[1580]	1300	DO k = nzb+1, nzt
[861]	1301	!
[1580]	1302	!-- At first, set flags to WS1.
	1303	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1304	!-- in order to handle the left/south flux.
	1305	!-- near vertical walls.
	1306	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1307	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1308	!
[861]	1309	!-- u component - x-direction
	1310	!-- WS1 (9), WS3 (10), WS5 (11)
[1762]	1311	IF ( k <= nzb_u_inner(j,i+1) .OR. &
	1312	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1313	.AND. i <= nxlu ) .OR. &
	1314	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1315	.AND. i == nxr ) ) &
	1316	THEN
[1580]	1317	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[1762]	1318	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
	1319	.OR. &
	1320	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1321	.AND. i == nxr-1 ) .OR. &
	1322	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1323	.AND. i == nxlu+1) ) &
	1324	THEN
[861]	1325	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1326	!
	1327	!-- Clear flag for WS1
	1328	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1329	ELSE
	1330	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1331	!
	1332	!-- Clear flag for WS1
	1333	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1334	ENDIF
	1335	!
	1336	!-- u component - y-direction
	1337	!-- WS1 (12), WS3 (13), WS5 (14)
[1762]	1338	IF ( k <= nzb_u_inner(j+1,i) .OR. &
	1339	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1340	.AND. j == nys ) .OR. &
	1341	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1342	.AND. j == nyn ) ) &
	1343	THEN
	1344	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1345	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[1762]	1346	.OR. &
	1347	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1348	.AND. j == nysv ) .OR. &
	1349	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1350	.AND. j == nyn-1 ) ) &
	1351	THEN
[861]	1352	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1353	!
	1354	!-- Clear flag for WS1
	1355	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1356	ELSE
	1357	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1358	!
	1359	!-- Clear flag for WS1
	1360	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1361	ENDIF
	1362	!
	1363	!-- u component - z-direction
	1364	!-- WS1 (15), WS3 (16), WS5 (17)
	1365	flag_set = .FALSE.
	1366	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1367	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1368	flag_set = .TRUE.
	1369	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1370	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1371	flag_set = .TRUE.
	1372	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1373	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1374	ENDIF
	1375
	1376	ENDDO
	1377	ENDDO
	1378	ENDDO
	1379
	1380	DO i = nxl, nxr
	1381	DO j = nys, nyn
[1580]	1382	DO k = nzb+1, nzt
[861]	1383	!
[1580]	1384	!-- At first, set flags to WS1.
	1385	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1386	!-- in order to handle the left/south flux.
	1387	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1388	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1389	!
[861]	1390	!-- v component - x-direction
	1391	!-- WS1 (18), WS3 (19), WS5 (20)
[1762]	1392	IF ( k <= nzb_v_inner(j,i+1) .OR. &
	1393	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1394	.AND. i == nxl ) .OR. &
	1395	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1396	.AND. i == nxr ) ) &
	1397	THEN
	1398	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1399	!
[861]	1400	!-- WS3
	1401	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[1762]	1402	.OR. &
	1403	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1404	.AND. i == nxr-1 ) .OR. &
	1405	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1406	.AND. i == nxlu ) ) &
	1407	THEN
[861]	1408	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1409	!
	1410	!-- Clear flag for WS1
	1411	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1412	ELSE
	1413	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1414	!
	1415	!-- Clear flag for WS1
	1416	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1417	ENDIF
	1418	!
	1419	!-- v component - y-direction
	1420	!-- WS1 (21), WS3 (22), WS5 (23)
[1762]	1421	IF ( k <= nzb_v_inner(j+1,i) .OR. &
	1422	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1423	.AND. j <= nysv ) .OR. &
	1424	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1425	.AND. j == nyn ) ) &
	1426	THEN
	1427	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1428	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[1762]	1429	.OR. &
	1430	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1431	.AND. j == nysv+1) .OR. &
	1432	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1433	.AND. j == nyn-1 ) ) &
	1434	THEN
[861]	1435	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1436	!
	1437	!-- Clear flag for WS1
	1438	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1439	ELSE
	1440	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1441	!
	1442	!-- Clear flag for WS1
	1443	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1444	ENDIF
	1445	!
	1446	!-- v component - z-direction
	1447	!-- WS1 (24), WS3 (25), WS5 (26)
	1448	flag_set = .FALSE.
	1449	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1450	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1451	flag_set = .TRUE.
	1452	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1453	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1454	flag_set = .TRUE.
	1455	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1456	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1457	ENDIF
	1458
	1459	ENDDO
	1460	ENDDO
	1461	ENDDO
	1462	DO i = nxl, nxr
	1463	DO j = nys, nyn
[1580]	1464	DO k = nzb+1, nzt
[861]	1465	!
[1580]	1466	!-- At first, set flags to WS1.
	1467	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1468	!-- in order to handle the left/south flux.
	1469	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1470	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1471	!
[861]	1472	!-- w component - x-direction
	1473	!-- WS1 (27), WS3 (28), WS5 (29)
[1762]	1474	IF ( k <= nzb_w_inner(j,i+1) .OR. &
	1475	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1476	.AND. i == nxl ) .OR. &
	1477	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1478	.AND. i == nxr ) ) &
	1479	THEN
	1480	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1481	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[1762]	1482	.OR. &
	1483	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1484	.AND. i == nxr-1 ) .OR. &
	1485	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1486	.AND. i == nxlu ) ) &
	1487	THEN
[861]	1488	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1489	!
	1490	!-- Clear flag for WS1
	1491	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1492	ELSE
	1493	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1494	!
	1495	!-- Clear flag for WS1
	1496	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1497	ENDIF
	1498	!
	1499	!-- w component - y-direction
	1500	!-- WS1 (30), WS3 (31), WS5 (32)
[1762]	1501	IF ( k <= nzb_w_inner(j+1,i) .OR. &
	1502	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1503	.AND. j == nys ) .OR. &
	1504	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1505	.AND. j == nyn ) ) &
	1506	THEN
	1507	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1508	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[1762]	1509	.OR. &
	1510	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1511	.AND. j == nysv ) .OR. &
	1512	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1513	.AND. j == nyn-1 ) ) &
	1514	THEN
[861]	1515	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1516	!
	1517	!-- Clear flag for WS1
	1518	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1519	ELSE
[1221]	1520	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1521	!
	1522	!-- Clear flag for WS1
	1523	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1524	ENDIF
	1525	!
	1526	!-- w component - z-direction
[1679]	1527	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1528	flag_set = .FALSE.
	1529	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1530	.OR. k == nzt ) THEN
	1531	!
	1532	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1533	!-- set, although this is not a prognostic level. However,
	1534	!-- contrary to the advection of u,v and s this is necessary
	1535	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1536	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1537	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1538	flag_set = .TRUE.
	1539	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1540	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1541	flag_set = .TRUE.
	1542	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1543	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1544	ENDIF
	1545
	1546	ENDDO
	1547	ENDDO
	1548	ENDDO
	1549
	1550	ENDIF
	1551
	1552	!
[1677]	1553	!-- Exchange 3D integer wall_flags.
	1554	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1555	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1556	!
	1557	!-- Exchange ghost points for advection flags
	1558	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1559	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1560	!
	1561	!-- Set boundary flags at inflow and outflow boundary in case of
	1562	!-- non-cyclic boundary conditions.
[1762]	1563	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1677]	1564	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1565	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1566	ENDIF
	1567
[1762]	1568	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
[1677]	1569	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1570	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1571	ENDIF
	1572
[1762]	1573	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
[1677]	1574	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1575	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1576	ENDIF
	1577
[1762]	1578	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1677]	1579	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1580	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1581	ENDIF
	1582
	1583	ENDIF
	1584
	1585	!
[1]	1586	!-- In case of topography: limit near-wall mixing length l_wall further:
	1587	!-- Go through all points of the subdomain one by one and look for the closest
	1588	!-- surface
	1589	IF ( TRIM(topography) /= 'flat' ) THEN
	1590	DO i = nxl, nxr
	1591	DO j = nys, nyn
	1592
	1593	nzb_si = nzb_s_inner(j,i)
	1594	vi = vertical_influence(nzb_si)
	1595
	1596	IF ( wall_n(j,i) > 0 ) THEN
	1597	!
	1598	!-- North wall (y distance)
	1599	DO k = wall_n(j,i), nzb_si
[1353]	1600	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1601	ENDDO
	1602	!
	1603	!-- Above North wall (yz distance)
	1604	DO k = nzb_si + 1, nzb_si + vi
[1353]	1605	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1606	SQRT( 0.25_wp * dy**2 + &
[1]	1607	( zu(k) - zw(nzb_si) )**2 ) )
	1608	ENDDO
	1609	!
	1610	!-- Northleft corner (xy distance)
	1611	IF ( corner_nl(j,i) > 0 ) THEN
	1612	DO k = corner_nl(j,i), nzb_si
	1613	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1614	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1615	ENDDO
	1616	!
	1617	!-- Above Northleft corner (xyz distance)
	1618	DO k = nzb_si + 1, nzb_si + vi
[1353]	1619	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1620	SQRT( 0.25_wp * (dx2 + dy2) + &
	1621	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1622	ENDDO
	1623	ENDIF
	1624	!
	1625	!-- Northright corner (xy distance)
	1626	IF ( corner_nr(j,i) > 0 ) THEN
	1627	DO k = corner_nr(j,i), nzb_si
[1353]	1628	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1629	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1630	ENDDO
	1631	!
	1632	!-- Above northright corner (xyz distance)
	1633	DO k = nzb_si + 1, nzb_si + vi
[1353]	1634	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1635	SQRT( 0.25_wp * (dx2 + dy2) + &
	1636	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1637	ENDDO
	1638	ENDIF
	1639	ENDIF
	1640
	1641	IF ( wall_s(j,i) > 0 ) THEN
	1642	!
	1643	!-- South wall (y distance)
	1644	DO k = wall_s(j,i), nzb_si
[1353]	1645	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1646	ENDDO
	1647	!
	1648	!-- Above south wall (yz distance)
[1353]	1649	DO k = nzb_si + 1, nzb_si + vi
	1650	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1651	SQRT( 0.25_wp * dy**2 + &
[1]	1652	( zu(k) - zw(nzb_si) )**2 ) )
	1653	ENDDO
	1654	!
	1655	!-- Southleft corner (xy distance)
	1656	IF ( corner_sl(j,i) > 0 ) THEN
	1657	DO k = corner_sl(j,i), nzb_si
[1353]	1658	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1659	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1660	ENDDO
	1661	!
	1662	!-- Above southleft corner (xyz distance)
	1663	DO k = nzb_si + 1, nzb_si + vi
[1353]	1664	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1665	SQRT( 0.25_wp * (dx2 + dy2) + &
	1666	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1667	ENDDO
	1668	ENDIF
	1669	!
	1670	!-- Southright corner (xy distance)
	1671	IF ( corner_sr(j,i) > 0 ) THEN
	1672	DO k = corner_sr(j,i), nzb_si
[1353]	1673	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1674	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1675	ENDDO
	1676	!
	1677	!-- Above southright corner (xyz distance)
	1678	DO k = nzb_si + 1, nzb_si + vi
[1353]	1679	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1680	SQRT( 0.25_wp * (dx2 + dy2) + &
	1681	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1682	ENDDO
	1683	ENDIF
	1684
	1685	ENDIF
	1686
	1687	IF ( wall_l(j,i) > 0 ) THEN
	1688	!
	1689	!-- Left wall (x distance)
	1690	DO k = wall_l(j,i), nzb_si
[1353]	1691	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1692	ENDDO
	1693	!
	1694	!-- Above left wall (xz distance)
	1695	DO k = nzb_si + 1, nzb_si + vi
[1353]	1696	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1697	SQRT( 0.25_wp * dx**2 + &
	1698	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1699	ENDDO
	1700	ENDIF
	1701
	1702	IF ( wall_r(j,i) > 0 ) THEN
	1703	!
	1704	!-- Right wall (x distance)
	1705	DO k = wall_r(j,i), nzb_si
[1353]	1706	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1707	ENDDO
	1708	!
	1709	!-- Above right wall (xz distance)
	1710	DO k = nzb_si + 1, nzb_si + vi
[1353]	1711	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1712	SQRT( 0.25_wp * dx**2 + &
[1]	1713	( zu(k) - zw(nzb_si) )**2 ) )
	1714	ENDDO
	1715
	1716	ENDIF
	1717
	1718	ENDDO
	1719	ENDDO
	1720
	1721	ENDIF
	1722
	1723	!
	1724	!-- Multiplication with wall_adjustment_factor
	1725	l_wall = wall_adjustment_factor * l_wall
	1726
	1727	!
[709]	1728	!-- Set lateral boundary conditions for l_wall
[667]	1729	CALL exchange_horiz( l_wall, nbgp )
	1730
[1]	1731	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1732	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1733
	1734
	1735	END SUBROUTINE init_grid

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