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source: palm/trunk/SOURCE/init_grid.f90 @ 1875

Last change on this file since 1875 was 1846, checked in by raasch, 9 years ago
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[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	! -----------------
[1805]	21	!
[1846]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: init_grid.f90 1846 2016-04-08 08:30:46Z raasch $
	26	!
[1846]	27	! 1845 2016-04-08 08:29:13Z raasch
	28	! nzb_2d removed
	29	!
[1805]	30	! 1804 2016-04-05 16:30:18Z maronga
	31	! Removed code for parameter file check (__check)
	32	!
[1780]	33	! 1779 2016-03-03 08:01:28Z raasch
	34	! coupling_char is trimmed at every place it occurs, because it can have
	35	! different length now
	36	!
[1763]	37	! 1762 2016-02-25 12:31:13Z hellstea
	38	! Introduction of nested domain feature
	39	!
[1744]	40	! 1743 2016-01-13 10:23:51Z raasch
	41	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	42	! total domain
	43	!
[1692]	44	! 1691 2015-10-26 16:17:44Z maronga
	45	! Renamed prandtl_layer to constant_flux_layer.
	46	!
[1683]	47	! 1682 2015-10-07 23:56:08Z knoop
	48	! Code annotations made doxygen readable
	49	!
[1678]	50	! 1677 2015-10-02 13:25:23Z boeske
	51	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	52	!
[1676]	53	! 1675 2015-10-02 08:28:59Z gronemeier
	54	! Bugfix: Definition of topography grid levels
	55	!
[1662]	56	! 1660 2015-09-21 08:15:16Z gronemeier
	57	! Bugfix: Definition of topography grid levels if vertical grid stretching
	58	! starts below the maximum topography height.
	59	!
[1581]	60	! 1580 2015-04-10 13:43:49Z suehring
	61	! Bugfix: setting flags for 5th order scheme near buildings
	62	!
[1576]	63	! 1575 2015-03-27 09:56:27Z raasch
	64	! adjustments for psolver-queries
	65	!
[1558]	66	! 1557 2015-03-05 16:43:04Z suehring
	67	! Adjustment for monotoinic limiter
	68	!
[1419]	69	! 1418 2014-06-06 13:05:08Z fricke
	70	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	71	! condition and a negative value for dz_stretch_level the condition
	72	! was always true for the whole model domain
	73	!
[1410]	74	! 1409 2014-05-23 12:11:32Z suehring
	75	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	76	! j <= nysv
	77	!
[1354]	78	! 1353 2014-04-08 15:21:23Z heinze
	79	! REAL constants provided with KIND-attribute
	80	!
[1323]	81	! 1322 2014-03-20 16:38:49Z raasch
	82	! REAL constants defined as wp-kind
	83	!
[1321]	84	! 1320 2014-03-20 08:40:49Z raasch
[1320]	85	! ONLY-attribute added to USE-statements,
	86	! kind-parameters added to all INTEGER and REAL declaration statements,
	87	! kinds are defined in new module kinds,
	88	! revision history before 2012 removed,
	89	! comment fields (!:) to be used for variable explanations added to
	90	! all variable declaration statements
[1321]	91	!
[1222]	92	! 1221 2013-09-10 08:59:13Z raasch
	93	! wall_flags_00 introduced to hold bits 32-63,
	94	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	95	! loops optimized for openACC (pres + flow_statistics)
	96	!
[1093]	97	! 1092 2013-02-02 11:24:22Z raasch
	98	! unused variables removed
	99	!
[1070]	100	! 1069 2012-11-28 16:18:43Z maronga
[1779]	101	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	102	! ocean model in case of coupled runs
[1070]	103	!
[1037]	104	! 1036 2012-10-22 13:43:42Z raasch
	105	! code put under GPL (PALM 3.9)
	106	!
[1017]	107	! 1015 2012-09-27 09:23:24Z raasch
	108	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	109	! nzb_w_inner+1
	110	!
[997]	111	! 996 2012-09-07 10:41:47Z raasch
	112	! little reformatting
	113	!
[979]	114	! 978 2012-08-09 08:28:32Z fricke
	115	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	116	! Bugfix: Set wall_flags_0 for inflow boundary
	117	!
[928]	118	! 927 2012-06-06 19:15:04Z raasch
	119	! Wall flags are not set for multigrid method in case of masking method
	120	!
[865]	121	! 864 2012-03-27 15:10:33Z gryschka
[927]	122	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	123	! were not correctly defined for k=1.
[865]	124	!
[863]	125	! 861 2012-03-26 14:18:34Z suehring
[861]	126	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	127	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	128	! model domain.!
[861]	129	! Initialization of nzb_s_inner and nzb_w_inner.
	130	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	131	! while setting wall_flags_0
	132	!
[844]	133	! 843 2012-02-29 15:16:21Z gryschka
	134	! In case of ocean and dirichlet bc for u and v at the bottom
	135	! the first u-level ist defined at same height as the first w-level
	136	!
[819]	137	! 818 2012-02-08 16:11:23Z maronga
	138	! Bugfix: topo_height is only required if topography is used. It is thus now
	139	! allocated in the topography branch
	140	!
[810]	141	! 809 2012-01-30 13:32:58Z maronga
	142	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	143	!
[808]	144	! 807 2012-01-25 11:53:51Z maronga
	145	! New cpp directive "__check" implemented which is used by check_namelist_files
	146	!
[1]	147	! Revision 1.1 1997/08/11 06:17:45 raasch
	148	! Initial revision (Testversion)
	149	!
	150	!
	151	! Description:
	152	! ------------
[1682]	153	!> Creating grid depending constants
[1]	154	!------------------------------------------------------------------------------!
[1682]	155	SUBROUTINE init_grid
	156
[1]	157
[1320]	158	USE arrays_3d, &
	159	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	160	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	161
[1353]	162	USE control_parameters, &
[1320]	163	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	164	building_length_y, building_wall_left, building_wall_south, &
	165	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	166	canyon_width_x, canyon_width_y, constant_flux_layer, &
	167	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	168	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	169	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	170	masking_method, maximum_grid_level, message_string, &
[1762]	171	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	172	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
	173	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	174	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	175	wall_adjustment_factor
[1320]	176
	177	USE grid_variables, &
	178	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	179	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	180	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	181
	182	USE indices, &
	183	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	184	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
[1845]	185	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
	186	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
	187	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
	188	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
[1320]	189	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	190	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	191	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	192	wall_flags_9
	193
	194	USE kinds
	195
[1]	196	USE pegrid
	197
	198	IMPLICIT NONE
	199
[1682]	200	INTEGER(iwp) :: bh !<
	201	INTEGER(iwp) :: blx !<
	202	INTEGER(iwp) :: bly !<
	203	INTEGER(iwp) :: bxl !<
	204	INTEGER(iwp) :: bxr !<
	205	INTEGER(iwp) :: byn !<
	206	INTEGER(iwp) :: bys !<
	207	INTEGER(iwp) :: ch !<
	208	INTEGER(iwp) :: cwx !<
	209	INTEGER(iwp) :: cwy !<
	210	INTEGER(iwp) :: cxl !<
	211	INTEGER(iwp) :: cxr !<
	212	INTEGER(iwp) :: cyn !<
	213	INTEGER(iwp) :: cys !<
	214	INTEGER(iwp) :: gls !<
	215	INTEGER(iwp) :: i !<
	216	INTEGER(iwp) :: ii !<
	217	INTEGER(iwp) :: inc !<
	218	INTEGER(iwp) :: j !<
	219	INTEGER(iwp) :: k !<
	220	INTEGER(iwp) :: l !<
	221	INTEGER(iwp) :: nxl_l !<
	222	INTEGER(iwp) :: nxr_l !<
	223	INTEGER(iwp) :: nyn_l !<
	224	INTEGER(iwp) :: nys_l !<
	225	INTEGER(iwp) :: nzb_si !<
	226	INTEGER(iwp) :: nzt_l !<
	227	INTEGER(iwp) :: vi !<
[1]	228
[1682]	229	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
[1]	230
[1682]	231	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
	232	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
	233	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
	234	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
	235	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
	236	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
	237	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
	238	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
	239	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
	240	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
[1]	241
[1682]	242	LOGICAL :: flag_set = .FALSE. !<
[861]	243
[1682]	244	REAL(wp) :: dx_l !<
	245	REAL(wp) :: dy_l !<
	246	REAL(wp) :: dz_stretched !<
[1]	247
[1682]	248	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
[1]	249
[667]	250
[1]	251	!
[709]	252	!-- Calculation of horizontal array bounds including ghost layers
[667]	253	nxlg = nxl - nbgp
	254	nxrg = nxr + nbgp
	255	nysg = nys - nbgp
	256	nyng = nyn + nbgp
[709]	257
[667]	258	!
[1]	259	!-- Allocate grid arrays
[1353]	260	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	261	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	262
	263	!
	264	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	265	IF ( dz == -1.0_wp ) THEN
[254]	266	message_string = 'missing dz'
	267	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	268	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	269	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	270	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	271	ENDIF
[94]	272
[1]	273	!
[94]	274	!-- Define the vertical grid levels
	275	IF ( .NOT. ocean ) THEN
	276	!
	277	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	278	!-- The second u-level (k=1) corresponds to the top of the
[94]	279	!-- Prandtl-layer.
[667]	280
	281	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	282	zu(0) = 0.0_wp
	283	! zu(0) = - dz * 0.5_wp
[667]	284	ELSE
[1353]	285	zu(0) = - dz * 0.5_wp
[667]	286	ENDIF
[1353]	287	zu(1) = dz * 0.5_wp
[1]	288
[94]	289	dz_stretch_level_index = nzt+1
	290	dz_stretched = dz
	291	DO k = 2, nzt+1
	292	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	293	dz_stretched = dz_stretched * dz_stretch_factor
	294	dz_stretched = MIN( dz_stretched, dz_max )
	295	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	296	ENDIF
	297	zu(k) = zu(k-1) + dz_stretched
	298	ENDDO
[1]	299
	300	!
[94]	301	!-- Compute the w-levels. They are always staggered half-way between the
[843]	302	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	303	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	304	!-- The top w-level is extrapolated linearly.
[1353]	305	zw(0) = 0.0_wp
[94]	306	DO k = 1, nzt
[1353]	307	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	308	ENDDO
[1353]	309	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	310
[94]	311	ELSE
[1]	312	!
[843]	313	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	314	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	315	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	316	!-- w-level are defined at same height, but staggered from the second level.
	317	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	318	zu(nzt+1) = dz * 0.5_wp
	319	zu(nzt) = - dz * 0.5_wp
[94]	320
	321	dz_stretch_level_index = 0
	322	dz_stretched = dz
	323	DO k = nzt-1, 0, -1
[1418]	324	!
	325	!-- The default value of dz_stretch_level is positive, thus the first
	326	!-- condition is always true. Hence, the second condition is necessary.
	327	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	328	.AND. dz_stretched < dz_max ) THEN
[94]	329	dz_stretched = dz_stretched * dz_stretch_factor
	330	dz_stretched = MIN( dz_stretched, dz_max )
	331	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	332	ENDIF
	333	zu(k) = zu(k+1) - dz_stretched
	334	ENDDO
	335
	336	!
	337	!-- Compute the w-levels. They are always staggered half-way between the
[843]	338	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	339	!-- at the ground. In this case the first u- and w-level are defined at
	340	!-- same height. The top w-level (nzt+1) is not used but set for
	341	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	342	zw(nzt+1) = dz
[1353]	343	zw(nzt) = 0.0_wp
[94]	344	DO k = 0, nzt
[1353]	345	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	346	ENDDO
	347
[843]	348	!
	349	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	350	!-- at same height.
	351	IF ( ibc_uv_b == 0 ) THEN
	352	zu(0) = zw(0)
	353	ENDIF
	354
[94]	355	ENDIF
	356
	357	!
[1]	358	!-- Compute grid lengths.
	359	DO k = 1, nzt+1
	360	dzu(k) = zu(k) - zu(k-1)
[1353]	361	ddzu(k) = 1.0_wp / dzu(k)
[1]	362	dzw(k) = zw(k) - zw(k-1)
[1353]	363	ddzw(k) = 1.0_wp / dzw(k)
[1]	364	ENDDO
	365
	366	DO k = 1, nzt
[1353]	367	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	368	ENDDO
[667]	369
	370	!
[709]	371	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	372	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	373	!-- is only dz/2, but should be dz. Therefore, an additional array
	374	!-- containing with appropriate grid information is created for these
	375	!-- solvers.
[1575]	376	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	377	ALLOCATE( ddzu_pres(1:nzt+1) )
	378	ddzu_pres = ddzu
[864]	379	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	380	ENDIF
[1]	381
	382	!
	383	!-- In case of multigrid method, compute grid lengths and grid factors for the
	384	!-- grid levels
[1575]	385	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	386
	387	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	388	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	389	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	390	f1_mg(nzb+1:nzt,maximum_grid_level), &
	391	f2_mg(nzb+1:nzt,maximum_grid_level), &
	392	f3_mg(nzb+1:nzt,maximum_grid_level) )
	393
	394	dzu_mg(:,maximum_grid_level) = dzu
[667]	395	!
[864]	396	!-- Next line to ensure an equally spaced grid.
	397	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	398
[1]	399	dzw_mg(:,maximum_grid_level) = dzw
	400	nzt_l = nzt
	401	DO l = maximum_grid_level-1, 1, -1
[1353]	402	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	403	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	404	nzt_l = nzt_l / 2
	405	DO k = 2, nzt_l+1
	406	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	407	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	408	ENDDO
	409	ENDDO
	410
	411	nzt_l = nzt
	412	dx_l = dx
	413	dy_l = dy
	414	DO l = maximum_grid_level, 1, -1
[1353]	415	ddx2_mg(l) = 1.0_wp / dx_l**2
	416	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	417	DO k = nzb+1, nzt_l
[1353]	418	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	419	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	420	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	421	f2_mg(k,l) + f3_mg(k,l)
	422	ENDDO
	423	nzt_l = nzt_l / 2
[1353]	424	dx_l = dx_l * 2.0_wp
	425	dy_l = dy_l * 2.0_wp
[1]	426	ENDDO
	427
	428	ENDIF
	429
	430	!
	431	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	432	ddx = 1.0_wp / dx
	433	ddy = 1.0_wp / dy
[1]	434	dx2 = dx * dx
	435	dy2 = dy * dy
[1353]	436	ddx2 = 1.0_wp / dx2
	437	ddy2 = 1.0_wp / dy2
[1]	438
	439	!
	440	!-- Compute the grid-dependent mixing length.
	441	DO k = 1, nzt
[1322]	442	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	443	ENDDO
	444
	445	!
	446	!-- Allocate outer and inner index arrays for topography and set
[114]	447	!-- defaults.
	448	!-- nzb_local has to contain additional layers of ghost points for calculating
	449	!-- the flag arrays needed for the multigrid method
	450	gls = 2**( maximum_grid_level )
[861]	451	IF ( gls < nbgp ) gls = nbgp
[667]	452
[114]	453	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	454	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	455	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	456	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	457	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	458	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	459	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	460	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	461	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	462	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	463	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	464	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	465	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	466	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	467	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	468	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	469	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	470	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	471	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	472	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	473	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	474	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
[1221]	475	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	476	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	477	wall_e_x(nysg:nyng,nxlg:nxrg), &
	478	wall_e_y(nysg:nyng,nxlg:nxrg), &
	479	wall_u(nysg:nyng,nxlg:nxrg), &
	480	wall_v(nysg:nyng,nxlg:nxrg), &
	481	wall_w_x(nysg:nyng,nxlg:nxrg), &
	482	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	483
	484
[667]	485
	486	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	487
[818]	488
[1]	489	nzb_s_inner = nzb; nzb_s_outer = nzb
	490	nzb_u_inner = nzb; nzb_u_outer = nzb
	491	nzb_v_inner = nzb; nzb_v_outer = nzb
	492	nzb_w_inner = nzb; nzb_w_outer = nzb
	493
[1353]	494	rflags_s_inner = 1.0_wp
	495	rflags_invers = 1.0_wp
[1221]	496
[1]	497	!
[19]	498	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	499	!-- form (which does not use surface fluxes) is applied
[1691]	500	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	501	nzb_diff = nzb + 2
	502	ELSE
	503	nzb_diff = nzb + 1
	504	ENDIF
[19]	505	IF ( use_top_fluxes ) THEN
	506	nzt_diff = nzt - 1
	507	ELSE
	508	nzt_diff = nzt
	509	ENDIF
[1]	510
	511	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	512	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	513
[1353]	514	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	515	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	516	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	517	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	518
	519	!
	520	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	521	!-- for the moment,
	522	!-- multiplication with wall_adjustment_factor near the end of this routine
	523	l_wall(nzb,:,:) = l_grid(1)
	524	DO k = nzb+1, nzt
	525	l_wall(k,:,:) = l_grid(k)
	526	ENDDO
	527	l_wall(nzt+1,:,:) = l_grid(nzt)
	528
	529	ALLOCATE ( vertical_influence(nzb:nzt) )
	530	DO k = 1, nzt
	531	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	532	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	533	ENDDO
	534
	535	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	536	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	537	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	538	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	539	'threshold given by only local', &
	540	' &horizontal reduction of near_wall ', &
	541	'mixing length l_wall', &
	542	' &starting from height level k = ', k, '.'
	543	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	544	EXIT
	545	ENDIF
	546	ENDDO
	547	vertical_influence(0) = vertical_influence(1)
	548
[667]	549	DO i = nxlg, nxrg
	550	DO j = nysg, nyng
[1]	551	DO k = nzb_s_inner(j,i) + 1, &
	552	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	553	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	554	ENDDO
	555	ENDDO
	556	ENDDO
	557
	558	!
	559	!-- Set outer and inner index arrays for non-flat topography.
	560	!-- Here consistency checks concerning domain size and periodicity are
	561	!-- necessary.
	562	!-- Within this SELECT CASE structure only nzb_local is initialized
	563	!-- individually depending on the chosen topography type, all other index
	564	!-- arrays are initialized further below.
	565	SELECT CASE ( TRIM( topography ) )
	566
	567	CASE ( 'flat' )
	568	!
[555]	569	!-- nzb_local is required for the multigrid solver
	570	nzb_local = 0
[1]	571
	572	CASE ( 'single_building' )
	573	!
	574	!-- Single rectangular building, by default centered in the middle of the
	575	!-- total domain
	576	blx = NINT( building_length_x / dx )
	577	bly = NINT( building_length_y / dy )
[1675]	578	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	579	IF ( ABS( zw(bh ) - building_height ) == &
	580	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	581
[1322]	582	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	583	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	584	ENDIF
	585	bxl = NINT( building_wall_left / dx )
	586	bxr = bxl + blx
	587
[1322]	588	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	589	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	590	ENDIF
	591	bys = NINT( building_wall_south / dy )
	592	byn = bys + bly
	593
	594	!
	595	!-- Building size has to meet some requirements
	596	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	597	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	598	WRITE( message_string, * ) 'inconsistent building parameters:', &
	599	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	600	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	601	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	602	ENDIF
	603
	604	!
[217]	605	!-- Define the building.
[1]	606	nzb_local = 0
[134]	607	nzb_local(bys:byn,bxl:bxr) = bh
[1]	608
[240]	609	CASE ( 'single_street_canyon' )
	610	!
	611	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	612	!-- The canyon is centered in the other direction by default.
[1322]	613	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	614	!
	615	!-- Street canyon in y direction
	616	cwx = NINT( canyon_width_x / dx )
[1322]	617	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	618	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	619	ENDIF
	620	cxl = NINT( canyon_wall_left / dx )
	621	cxr = cxl + cwx
	622
[1322]	623	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	624	!
	625	!-- Street canyon in x direction
	626	cwy = NINT( canyon_width_y / dy )
[1322]	627	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	628	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	629	ENDIF
	630	cys = NINT( canyon_wall_south / dy )
	631	cyn = cys + cwy
	632
	633	ELSE
[254]	634
	635	message_string = 'no street canyon width given'
	636	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	637
[240]	638	ENDIF
	639
[1675]	640	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	641	IF ( ABS( zw(ch ) - canyon_height ) == &
	642	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	643
[240]	644	dp_level_ind_b = ch
	645	!
	646	!-- Street canyon size has to meet some requirements
[1322]	647	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	648	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	649	( ch < 3 ) ) THEN
[1353]	650	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	651	'&cxl=', cxl, 'cxr=', cxr, &
	652	'cwx=', cwx, &
[254]	653	'ch=', ch, 'nx=', nx, 'ny=', ny
	654	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	655	ENDIF
[1322]	656	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	657	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	658	( ch < 3 ) ) THEN
[1353]	659	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	660	'&cys=', cys, 'cyn=', cyn, &
	661	'cwy=', cwy, &
[254]	662	'ch=', ch, 'nx=', nx, 'ny=', ny
	663	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	664	ENDIF
	665	ENDIF
[1353]	666	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	667	canyon_width_y /= 9999999.9_wp ) THEN
	668	message_string = 'inconsistent canyon parameters:' // &
	669	'&street canyon can only be oriented' // &
[254]	670	'&either in x- or in y-direction'
	671	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	672	ENDIF
	673
	674	nzb_local = ch
[1322]	675	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	676	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	677	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	678	nzb_local(cys+1:cyn-1,:) = 0
	679	ENDIF
	680
[1]	681	CASE ( 'read_from_file' )
[759]	682
[818]	683	ALLOCATE ( topo_height(0:ny,0:nx) )
	684
[759]	685	DO ii = 0, io_blocks-1
	686	IF ( ii == io_group ) THEN
	687
[1]	688	!
[759]	689	!-- Arbitrary irregular topography data in PALM format (exactly
	690	!-- matching the grid size and total domain size)
[1779]	691	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	692	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[759]	693	DO j = ny, 0, -1
	694	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	695	ENDDO
	696
	697	GOTO 12
	698
[1779]	699	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	700	' does not exist'
[759]	701	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	702
[1779]	703	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	704	TRIM( coupling_char )
[759]	705	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	706
	707	12 CLOSE( 90 )
	708
	709	ENDIF
[1804]	710	#if defined( __parallel )
[759]	711	CALL MPI_BARRIER( comm2d, ierr )
	712	#endif
[559]	713	ENDDO
[759]	714
[1]	715	!
	716	!-- Calculate the index height of the topography
	717	DO i = 0, nx
	718	DO j = 0, ny
[1675]	719	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	720	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	721	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	722	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	723	ENDDO
	724	ENDDO
[818]	725
	726	DEALLOCATE ( topo_height )
[114]	727	!
[759]	728	!-- Add cyclic boundaries (additional layers are for calculating
	729	!-- flag arrays needed for the multigrid sover)
[114]	730	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	731	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	732	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	733	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	734
[1]	735	CASE DEFAULT
	736	!
	737	!-- The DEFAULT case is reached either if the parameter topography
[217]	738	!-- contains a wrong character string or if the user has defined a special
[1]	739	!-- case in the user interface. There, the subroutine user_init_grid
	740	!-- checks which of these two conditions applies.
[114]	741	CALL user_init_grid( gls, nzb_local )
[1]	742
	743	END SELECT
	744	!
[861]	745	!-- Determine the maximum level of topography. Furthermore it is used for
	746	!-- steering the degradation of order of the applied advection scheme.
[978]	747	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	748	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	749	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	750	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	751	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	752	nest_domain ) &
	753	THEN
	754	nzb_max = nzt
[978]	755	ENDIF
	756
[861]	757	!
[1]	758	!-- Consistency checks and index array initialization are only required for
[217]	759	!-- non-flat topography, also the initialization of topography height arrays
[49]	760	!-- zu_s_inner and zw_w_inner
[1]	761	IF ( TRIM( topography ) /= 'flat' ) THEN
	762
	763	!
	764	!-- Consistency checks
	765	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	766	WRITE( message_string, * ) 'nzb_local values are outside the', &
	767	'model domain', &
	768	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	769	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	770	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	771	ENDIF
	772
[722]	773	IF ( bc_lr == 'cyclic' ) THEN
[1353]	774	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	775	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	776	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	777	' boundary condition in x-direction'
	778	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	779	ENDIF
	780	ENDIF
[722]	781	IF ( bc_ns == 'cyclic' ) THEN
[1353]	782	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	783	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	784	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	785	' boundary condition in y-direction'
	786	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	787	ENDIF
	788	ENDIF
	789
[217]	790	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	791	!
[217]	792	!-- The array nzb_local as defined using the 'cell_edge' convention
	793	!-- describes the actual total size of topography which is defined at the
	794	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	795	!-- on the topography walls in y-direction. However, PALM uses individual
	796	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	797	!-- Therefore, the extent of topography in nzb_local is now reduced by
	798	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	799	!-- to form the basis for nzb_s_inner.
	800	DO j = -gls, ny + gls
	801	DO i = -gls, nx
	802	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	803	ENDDO
[134]	804	ENDDO
[217]	805	!-- apply cyclic boundary conditions in x-direction
	806	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	807	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	808	DO i = -gls, nx + gls
	809	DO j = -gls, ny
	810	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	811	ENDDO
[134]	812	ENDDO
[217]	813	!-- apply cyclic boundary conditions in y-direction
	814	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	815	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	816	ENDIF
[134]	817
[1]	818	!
	819	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	820	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	821	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	822
	823	!
	824	!-- Initialize remaining index arrays:
	825	!-- first pre-initialize them with nzb_s_inner...
	826	nzb_u_inner = nzb_s_inner
	827	nzb_u_outer = nzb_s_inner
	828	nzb_v_inner = nzb_s_inner
	829	nzb_v_outer = nzb_s_inner
	830	nzb_w_outer = nzb_s_inner
	831	nzb_s_outer = nzb_s_inner
	832
	833	!
	834	!-- ...then extend pre-initialized arrays in their according directions
	835	!-- based on nzb_local using nzb_tmp as a temporary global index array
	836
	837	!
	838	!-- nzb_s_outer:
	839	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	840	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	841	DO j = -1, ny + 1
	842	DO i = 0, nx
[1353]	843	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	844	nzb_local(j,i+1) )
	845	ENDDO
	846	ENDDO
	847	DO i = nxl, nxr
	848	DO j = nys, nyn
[1353]	849	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	850	nzb_tmp(j+1,i) )
	851	ENDDO
	852	!
	853	!-- non-cyclic boundary conditions (overwritten by call of
	854	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	855	IF ( nys == 0 ) THEN
	856	j = -1
	857	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	858	ENDIF
[1743]	859	IF ( nyn == ny ) THEN
[1]	860	j = ny + 1
	861	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	862	ENDIF
	863	ENDDO
	864	!
	865	!-- nzb_w_outer:
	866	!-- identical to nzb_s_outer
	867	nzb_w_outer = nzb_s_outer
	868
	869	!
	870	!-- nzb_u_inner:
	871	!-- extend nzb_local rightwards only
[667]	872	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	873	DO j = -1, ny + 1
	874	DO i = 0, nx + 1
	875	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	876	ENDDO
	877	ENDDO
[667]	878	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	879
	880	!
	881	!-- nzb_u_outer:
	882	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	883	DO i = nxl, nxr
	884	DO j = nys, nyn
[1353]	885	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	886	nzb_tmp(j+1,i) )
	887	ENDDO
	888	!
	889	!-- non-cyclic boundary conditions (overwritten by call of
	890	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	891	IF ( nys == 0 ) THEN
	892	j = -1
	893	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	894	ENDIF
[1743]	895	IF ( nyn == ny ) THEN
[1]	896	j = ny + 1
	897	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	898	ENDIF
	899	ENDDO
	900
	901	!
	902	!-- nzb_v_inner:
	903	!-- extend nzb_local northwards only
[667]	904	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	905	DO i = -1, nx + 1
	906	DO j = 0, ny + 1
	907	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	908	ENDDO
	909	ENDDO
[667]	910	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	911
	912	!
	913	!-- nzb_v_outer:
	914	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	915	DO j = nys, nyn
	916	DO i = nxl, nxr
[1353]	917	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	918	nzb_tmp(j,i+1) )
	919	ENDDO
	920	!
	921	!-- non-cyclic boundary conditions (overwritten by call of
	922	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	923	IF ( nxl == 0 ) THEN
	924	i = -1
	925	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	926	ENDIF
	927	IF ( nxr == nx ) THEN
	928	i = nx + 1
	929	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	930	ENDIF
	931	ENDDO
[1804]	932
[1]	933	!
	934	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	935	!-- boundary conditions, if applicable.
	936	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	937	!-- they do not require exchange and are not included here.
	938	CALL exchange_horiz_2d_int( nzb_u_inner )
	939	CALL exchange_horiz_2d_int( nzb_u_outer )
	940	CALL exchange_horiz_2d_int( nzb_v_inner )
	941	CALL exchange_horiz_2d_int( nzb_v_outer )
	942	CALL exchange_horiz_2d_int( nzb_w_outer )
	943	CALL exchange_horiz_2d_int( nzb_s_outer )
	944
[49]	945	!
	946	!-- Allocate and set the arrays containing the topography height
	947	IF ( myid == 0 ) THEN
	948
	949	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	950
	951	DO i = 0, nx + 1
	952	DO j = 0, ny + 1
	953	zu_s_inner(i,j) = zu(nzb_local(j,i))
	954	zw_w_inner(i,j) = zw(nzb_local(j,i))
	955	ENDDO
	956	ENDDO
	957
	958	ENDIF
[1221]	959	!
	960	!-- Set flag arrays to be used for masking of grid points
	961	DO i = nxlg, nxrg
	962	DO j = nysg, nyng
	963	DO k = nzb, nzt+1
[1353]	964	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	965	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	966	ENDDO
	967	ENDDO
	968	ENDDO
[1804]	969
[1]	970	ENDIF
	971
	972	!
	973	!-- Set the individual index arrays which define the k index from which on
	974	!-- the usual finite difference form (which does not use surface fluxes) is
	975	!-- applied
[1691]	976	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	977	nzb_diff_u = nzb_u_inner + 2
	978	nzb_diff_v = nzb_v_inner + 2
	979	nzb_diff_s_inner = nzb_s_inner + 2
	980	nzb_diff_s_outer = nzb_s_outer + 2
	981	ELSE
	982	nzb_diff_u = nzb_u_inner + 1
	983	nzb_diff_v = nzb_v_inner + 1
	984	nzb_diff_s_inner = nzb_s_inner + 1
	985	nzb_diff_s_outer = nzb_s_outer + 1
	986	ENDIF
	987
	988	!
	989	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	990	!-- for limitation of near-wall mixing length l_wall further below
	991	corner_nl = 0
	992	corner_nr = 0
	993	corner_sl = 0
	994	corner_sr = 0
	995	wall_l = 0
	996	wall_n = 0
	997	wall_r = 0
	998	wall_s = 0
	999
	1000	DO i = nxl, nxr
	1001	DO j = nys, nyn
	1002	!
	1003	!-- u-component
	1004	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1005	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1006	fym(j,i) = 0.0_wp
	1007	fyp(j,i) = 1.0_wp
[1]	1008	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1009	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1010	fym(j,i) = 1.0_wp
	1011	fyp(j,i) = 0.0_wp
[1]	1012	ENDIF
	1013	!
	1014	!-- v-component
	1015	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1016	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1017	fxm(j,i) = 0.0_wp
	1018	fxp(j,i) = 1.0_wp
[1]	1019	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1020	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1021	fxm(j,i) = 1.0_wp
	1022	fxp(j,i) = 0.0_wp
[1]	1023	ENDIF
	1024	!
	1025	!-- w-component, also used for scalars, separate arrays for shear
	1026	!-- production of tke
	1027	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1028	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1029	wall_w_y(j,i) = 1.0_wp
	1030	fwym(j,i) = 0.0_wp
	1031	fwyp(j,i) = 1.0_wp
[1]	1032	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1033	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1034	wall_w_y(j,i) = 1.0_wp
	1035	fwym(j,i) = 1.0_wp
	1036	fwyp(j,i) = 0.0_wp
[1]	1037	ENDIF
	1038	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1039	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1040	wall_w_x(j,i) = 1.0_wp
	1041	fwxm(j,i) = 0.0_wp
	1042	fwxp(j,i) = 1.0_wp
[1]	1043	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1044	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1045	wall_w_x(j,i) = 1.0_wp
	1046	fwxm(j,i) = 1.0_wp
	1047	fwxp(j,i) = 0.0_wp
[1]	1048	ENDIF
	1049	!
	1050	!-- Wall and corner locations inside buildings for limitation of
	1051	!-- near-wall mixing length l_wall
	1052	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1053
	1054	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1055
	1056	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1057	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1058	nzb_s_inner(j,i-1) ) + 1
	1059	ENDIF
	1060
	1061	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1062	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1063	nzb_s_inner(j,i+1) ) + 1
	1064	ENDIF
	1065
	1066	ENDIF
	1067
	1068	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1069
	1070	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1071	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1072	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1073	nzb_s_inner(j,i-1) ) + 1
	1074	ENDIF
	1075
	1076	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1077	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1078	nzb_s_inner(j,i+1) ) + 1
	1079	ENDIF
	1080
	1081	ENDIF
	1082
	1083	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1084	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1085	ENDIF
	1086
	1087	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1088	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1089	ENDIF
	1090
	1091	ENDDO
	1092	ENDDO
	1093
	1094	!
[114]	1095	!-- Calculate wall flag arrays for the multigrid method
[1575]	1096	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1097	!
	1098	!-- Gridpoint increment of the current level
	1099	inc = 1
	1100
	1101	DO l = maximum_grid_level, 1 , -1
	1102
	1103	nxl_l = nxl_mg(l)
	1104	nxr_l = nxr_mg(l)
	1105	nys_l = nys_mg(l)
	1106	nyn_l = nyn_mg(l)
	1107	nzt_l = nzt_mg(l)
	1108
	1109	!
	1110	!-- Assign the flag level to be calculated
	1111	SELECT CASE ( l )
	1112	CASE ( 1 )
	1113	flags => wall_flags_1
	1114	CASE ( 2 )
	1115	flags => wall_flags_2
	1116	CASE ( 3 )
	1117	flags => wall_flags_3
	1118	CASE ( 4 )
	1119	flags => wall_flags_4
	1120	CASE ( 5 )
	1121	flags => wall_flags_5
	1122	CASE ( 6 )
	1123	flags => wall_flags_6
	1124	CASE ( 7 )
	1125	flags => wall_flags_7
	1126	CASE ( 8 )
	1127	flags => wall_flags_8
	1128	CASE ( 9 )
	1129	flags => wall_flags_9
	1130	CASE ( 10 )
	1131	flags => wall_flags_10
	1132	END SELECT
	1133
	1134	!
	1135	!-- Depending on the grid level, set the respective bits in case of
	1136	!-- neighbouring walls
	1137	!-- Bit 0: wall to the bottom
	1138	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1139	!-- Bit 2: wall to the south
	1140	!-- Bit 3: wall to the north
	1141	!-- Bit 4: wall to the left
	1142	!-- Bit 5: wall to the right
[116]	1143	!-- Bit 6: inside building
[114]	1144
	1145	flags = 0
	1146
[927]	1147	!
	1148	!-- In case of masking method, flags are not set and multigrid method
	1149	!-- works like FFT-solver
	1150	IF ( .NOT. masking_method ) THEN
	1151
	1152	DO i = nxl_l-1, nxr_l+1
	1153	DO j = nys_l-1, nyn_l+1
	1154	DO k = nzb, nzt_l+1
[114]	1155
	1156	!
[927]	1157	!-- Inside/outside building (inside building does not need
	1158	!-- further tests for walls)
	1159	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1160
[927]	1161	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1162
[927]	1163	ELSE
[114]	1164	!
[927]	1165	!-- Bottom wall
	1166	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1167	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1168	ENDIF
[114]	1169	!
[927]	1170	!-- South wall
	1171	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1172	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1173	ENDIF
[114]	1174	!
[927]	1175	!-- North wall
	1176	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1177	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1178	ENDIF
[114]	1179	!
[927]	1180	!-- Left wall
	1181	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1182	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1183	ENDIF
[114]	1184	!
[927]	1185	!-- Right wall
	1186	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1187	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1188	ENDIF
	1189
[114]	1190	ENDIF
	1191
[927]	1192	ENDDO
[114]	1193	ENDDO
	1194	ENDDO
	1195
[927]	1196	ENDIF
	1197
[114]	1198	!
	1199	!-- Test output of flag arrays
[145]	1200	! i = nxl_l
	1201	! WRITE (9,*) ' '
	1202	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1203	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1204	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1205	! DO k = nzt_l+1, nzb, -1
	1206	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1207	! ENDDO
[114]	1208
	1209	inc = inc * 2
	1210
	1211	ENDDO
	1212
	1213	ENDIF
[861]	1214	!
	1215	!-- Allocate flags needed for masking walls.
[1677]	1216	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1217	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1218	wall_flags_0 = 0
	1219	wall_flags_00 = 0
[114]	1220
[1557]	1221	IF ( scalar_advec == 'ws-scheme' .OR. &
	1222	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1223	!
[861]	1224	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1225	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1226	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1227	!-- grid points.
	1228	DO i = nxl, nxr
	1229	DO j = nys, nyn
	1230	DO k = nzb_s_inner(j,i)+1, nzt
	1231	!
	1232	!-- scalar - x-direction
	1233	!-- WS1 (0), WS3 (1), WS5 (2)
[1762]	1234	IF ( k <= nzb_s_inner(j,i+1) .OR. &
	1235	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1236	.AND. i == nxl ) .OR. &
	1237	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1238	.AND. i == nxr ) ) &
	1239	THEN
[861]	1240	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1241	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[1762]	1242	.OR. &
	1243	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1244	.AND. i == nxr-1 ) .OR. &
	1245	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1246	.AND. i == nxlu ) ) &
	1247	THEN
[861]	1248	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1249	ELSE
	1250	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1251	ENDIF
	1252	!
	1253	!-- scalar - y-direction
	1254	!-- WS1 (3), WS3 (4), WS5 (5)
[1762]	1255	IF ( k <= nzb_s_inner(j+1,i) .OR. &
	1256	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1257	.AND. j == nys ) .OR. &
	1258	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1259	.AND. j == nyn ) ) &
	1260	THEN
[861]	1261	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
[1762]	1262	!
[861]	1263	!-- WS3
	1264	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[1762]	1265	.OR. &
	1266	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1267	.AND. j == nysv ) .OR. &
	1268	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1269	.AND. j == nyn-1 ) ) &
	1270	THEN
[861]	1271	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
[1762]	1272	!
[861]	1273	!-- WS5
	1274	ELSE
	1275	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1276	ENDIF
	1277	!
	1278	!-- scalar - z-direction
	1279	!-- WS1 (6), WS3 (7), WS5 (8)
	1280	flag_set = .FALSE.
	1281	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1282	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1283	flag_set = .TRUE.
	1284	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1285	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1286	flag_set = .TRUE.
	1287	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1288	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1289	ENDIF
	1290	ENDDO
	1291	ENDDO
	1292	ENDDO
	1293	ENDIF
	1294
	1295	IF ( momentum_advec == 'ws-scheme' ) THEN
	1296	!
	1297	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1298	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1299	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1300	!-- grid points.
	1301	DO i = nxl, nxr
	1302	DO j = nys, nyn
[1580]	1303	DO k = nzb+1, nzt
[861]	1304	!
[1580]	1305	!-- At first, set flags to WS1.
	1306	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1307	!-- in order to handle the left/south flux.
	1308	!-- near vertical walls.
	1309	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1310	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1311	!
[861]	1312	!-- u component - x-direction
	1313	!-- WS1 (9), WS3 (10), WS5 (11)
[1762]	1314	IF ( k <= nzb_u_inner(j,i+1) .OR. &
	1315	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1316	.AND. i <= nxlu ) .OR. &
	1317	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1318	.AND. i == nxr ) ) &
	1319	THEN
[1580]	1320	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[1762]	1321	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
	1322	.OR. &
	1323	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1324	.AND. i == nxr-1 ) .OR. &
	1325	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1326	.AND. i == nxlu+1) ) &
	1327	THEN
[861]	1328	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1329	!
	1330	!-- Clear flag for WS1
	1331	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1332	ELSE
	1333	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1334	!
	1335	!-- Clear flag for WS1
	1336	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1337	ENDIF
	1338	!
	1339	!-- u component - y-direction
	1340	!-- WS1 (12), WS3 (13), WS5 (14)
[1762]	1341	IF ( k <= nzb_u_inner(j+1,i) .OR. &
	1342	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1343	.AND. j == nys ) .OR. &
	1344	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1345	.AND. j == nyn ) ) &
	1346	THEN
	1347	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1348	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[1762]	1349	.OR. &
	1350	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1351	.AND. j == nysv ) .OR. &
	1352	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1353	.AND. j == nyn-1 ) ) &
	1354	THEN
[861]	1355	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1356	!
	1357	!-- Clear flag for WS1
	1358	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1359	ELSE
	1360	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1361	!
	1362	!-- Clear flag for WS1
	1363	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1364	ENDIF
	1365	!
	1366	!-- u component - z-direction
	1367	!-- WS1 (15), WS3 (16), WS5 (17)
	1368	flag_set = .FALSE.
	1369	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1370	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1371	flag_set = .TRUE.
	1372	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1373	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1374	flag_set = .TRUE.
	1375	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1376	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1377	ENDIF
	1378
	1379	ENDDO
	1380	ENDDO
	1381	ENDDO
	1382
	1383	DO i = nxl, nxr
	1384	DO j = nys, nyn
[1580]	1385	DO k = nzb+1, nzt
[861]	1386	!
[1580]	1387	!-- At first, set flags to WS1.
	1388	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1389	!-- in order to handle the left/south flux.
	1390	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1391	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1392	!
[861]	1393	!-- v component - x-direction
	1394	!-- WS1 (18), WS3 (19), WS5 (20)
[1762]	1395	IF ( k <= nzb_v_inner(j,i+1) .OR. &
	1396	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1397	.AND. i == nxl ) .OR. &
	1398	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1399	.AND. i == nxr ) ) &
	1400	THEN
	1401	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1402	!
[861]	1403	!-- WS3
	1404	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[1762]	1405	.OR. &
	1406	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1407	.AND. i == nxr-1 ) .OR. &
	1408	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1409	.AND. i == nxlu ) ) &
	1410	THEN
[861]	1411	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1412	!
	1413	!-- Clear flag for WS1
	1414	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1415	ELSE
	1416	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1417	!
	1418	!-- Clear flag for WS1
	1419	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1420	ENDIF
	1421	!
	1422	!-- v component - y-direction
	1423	!-- WS1 (21), WS3 (22), WS5 (23)
[1762]	1424	IF ( k <= nzb_v_inner(j+1,i) .OR. &
	1425	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1426	.AND. j <= nysv ) .OR. &
	1427	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1428	.AND. j == nyn ) ) &
	1429	THEN
	1430	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1431	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[1762]	1432	.OR. &
	1433	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1434	.AND. j == nysv+1) .OR. &
	1435	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1436	.AND. j == nyn-1 ) ) &
	1437	THEN
[861]	1438	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1439	!
	1440	!-- Clear flag for WS1
	1441	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1442	ELSE
	1443	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1444	!
	1445	!-- Clear flag for WS1
	1446	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1447	ENDIF
	1448	!
	1449	!-- v component - z-direction
	1450	!-- WS1 (24), WS3 (25), WS5 (26)
	1451	flag_set = .FALSE.
	1452	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1453	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1454	flag_set = .TRUE.
	1455	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1456	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1457	flag_set = .TRUE.
	1458	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1459	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1460	ENDIF
	1461
	1462	ENDDO
	1463	ENDDO
	1464	ENDDO
	1465	DO i = nxl, nxr
	1466	DO j = nys, nyn
[1580]	1467	DO k = nzb+1, nzt
[861]	1468	!
[1580]	1469	!-- At first, set flags to WS1.
	1470	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1471	!-- in order to handle the left/south flux.
	1472	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1473	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1474	!
[861]	1475	!-- w component - x-direction
	1476	!-- WS1 (27), WS3 (28), WS5 (29)
[1762]	1477	IF ( k <= nzb_w_inner(j,i+1) .OR. &
	1478	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1479	.AND. i == nxl ) .OR. &
	1480	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1481	.AND. i == nxr ) ) &
	1482	THEN
	1483	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1484	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[1762]	1485	.OR. &
	1486	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1487	.AND. i == nxr-1 ) .OR. &
	1488	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1489	.AND. i == nxlu ) ) &
	1490	THEN
[861]	1491	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1492	!
	1493	!-- Clear flag for WS1
	1494	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1495	ELSE
	1496	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1497	!
	1498	!-- Clear flag for WS1
	1499	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1500	ENDIF
	1501	!
	1502	!-- w component - y-direction
	1503	!-- WS1 (30), WS3 (31), WS5 (32)
[1762]	1504	IF ( k <= nzb_w_inner(j+1,i) .OR. &
	1505	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1506	.AND. j == nys ) .OR. &
	1507	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1508	.AND. j == nyn ) ) &
	1509	THEN
	1510	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1511	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[1762]	1512	.OR. &
	1513	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1514	.AND. j == nysv ) .OR. &
	1515	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1516	.AND. j == nyn-1 ) ) &
	1517	THEN
[861]	1518	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1519	!
	1520	!-- Clear flag for WS1
	1521	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1522	ELSE
[1221]	1523	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1524	!
	1525	!-- Clear flag for WS1
	1526	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1527	ENDIF
	1528	!
	1529	!-- w component - z-direction
[1679]	1530	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1531	flag_set = .FALSE.
	1532	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1533	.OR. k == nzt ) THEN
	1534	!
	1535	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1536	!-- set, although this is not a prognostic level. However,
	1537	!-- contrary to the advection of u,v and s this is necessary
	1538	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1539	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1540	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1541	flag_set = .TRUE.
	1542	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1543	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1544	flag_set = .TRUE.
	1545	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1546	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1547	ENDIF
	1548
	1549	ENDDO
	1550	ENDDO
	1551	ENDDO
	1552
	1553	ENDIF
	1554
	1555	!
[1677]	1556	!-- Exchange 3D integer wall_flags.
	1557	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1558	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1559	!
	1560	!-- Exchange ghost points for advection flags
	1561	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1562	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1563	!
	1564	!-- Set boundary flags at inflow and outflow boundary in case of
	1565	!-- non-cyclic boundary conditions.
[1762]	1566	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1677]	1567	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1568	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1569	ENDIF
	1570
[1762]	1571	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
[1677]	1572	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1573	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1574	ENDIF
	1575
[1762]	1576	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
[1677]	1577	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1578	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1579	ENDIF
	1580
[1762]	1581	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1677]	1582	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1583	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1584	ENDIF
	1585
	1586	ENDIF
	1587
	1588	!
[1]	1589	!-- In case of topography: limit near-wall mixing length l_wall further:
	1590	!-- Go through all points of the subdomain one by one and look for the closest
	1591	!-- surface
	1592	IF ( TRIM(topography) /= 'flat' ) THEN
	1593	DO i = nxl, nxr
	1594	DO j = nys, nyn
	1595
	1596	nzb_si = nzb_s_inner(j,i)
	1597	vi = vertical_influence(nzb_si)
	1598
	1599	IF ( wall_n(j,i) > 0 ) THEN
	1600	!
	1601	!-- North wall (y distance)
	1602	DO k = wall_n(j,i), nzb_si
[1353]	1603	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1604	ENDDO
	1605	!
	1606	!-- Above North wall (yz distance)
	1607	DO k = nzb_si + 1, nzb_si + vi
[1353]	1608	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1609	SQRT( 0.25_wp * dy**2 + &
[1]	1610	( zu(k) - zw(nzb_si) )**2 ) )
	1611	ENDDO
	1612	!
	1613	!-- Northleft corner (xy distance)
	1614	IF ( corner_nl(j,i) > 0 ) THEN
	1615	DO k = corner_nl(j,i), nzb_si
	1616	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1617	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1618	ENDDO
	1619	!
	1620	!-- Above Northleft corner (xyz distance)
	1621	DO k = nzb_si + 1, nzb_si + vi
[1353]	1622	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1623	SQRT( 0.25_wp * (dx2 + dy2) + &
	1624	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1625	ENDDO
	1626	ENDIF
	1627	!
	1628	!-- Northright corner (xy distance)
	1629	IF ( corner_nr(j,i) > 0 ) THEN
	1630	DO k = corner_nr(j,i), nzb_si
[1353]	1631	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1632	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1633	ENDDO
	1634	!
	1635	!-- Above northright corner (xyz distance)
	1636	DO k = nzb_si + 1, nzb_si + vi
[1353]	1637	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1638	SQRT( 0.25_wp * (dx2 + dy2) + &
	1639	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1640	ENDDO
	1641	ENDIF
	1642	ENDIF
	1643
	1644	IF ( wall_s(j,i) > 0 ) THEN
	1645	!
	1646	!-- South wall (y distance)
	1647	DO k = wall_s(j,i), nzb_si
[1353]	1648	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1649	ENDDO
	1650	!
	1651	!-- Above south wall (yz distance)
[1353]	1652	DO k = nzb_si + 1, nzb_si + vi
	1653	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1654	SQRT( 0.25_wp * dy**2 + &
[1]	1655	( zu(k) - zw(nzb_si) )**2 ) )
	1656	ENDDO
	1657	!
	1658	!-- Southleft corner (xy distance)
	1659	IF ( corner_sl(j,i) > 0 ) THEN
	1660	DO k = corner_sl(j,i), nzb_si
[1353]	1661	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1662	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1663	ENDDO
	1664	!
	1665	!-- Above southleft corner (xyz distance)
	1666	DO k = nzb_si + 1, nzb_si + vi
[1353]	1667	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1668	SQRT( 0.25_wp * (dx2 + dy2) + &
	1669	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1670	ENDDO
	1671	ENDIF
	1672	!
	1673	!-- Southright corner (xy distance)
	1674	IF ( corner_sr(j,i) > 0 ) THEN
	1675	DO k = corner_sr(j,i), nzb_si
[1353]	1676	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1677	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1678	ENDDO
	1679	!
	1680	!-- Above southright corner (xyz distance)
	1681	DO k = nzb_si + 1, nzb_si + vi
[1353]	1682	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1683	SQRT( 0.25_wp * (dx2 + dy2) + &
	1684	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1685	ENDDO
	1686	ENDIF
	1687
	1688	ENDIF
	1689
	1690	IF ( wall_l(j,i) > 0 ) THEN
	1691	!
	1692	!-- Left wall (x distance)
	1693	DO k = wall_l(j,i), nzb_si
[1353]	1694	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1695	ENDDO
	1696	!
	1697	!-- Above left wall (xz distance)
	1698	DO k = nzb_si + 1, nzb_si + vi
[1353]	1699	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1700	SQRT( 0.25_wp * dx**2 + &
	1701	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1702	ENDDO
	1703	ENDIF
	1704
	1705	IF ( wall_r(j,i) > 0 ) THEN
	1706	!
	1707	!-- Right wall (x distance)
	1708	DO k = wall_r(j,i), nzb_si
[1353]	1709	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1710	ENDDO
	1711	!
	1712	!-- Above right wall (xz distance)
	1713	DO k = nzb_si + 1, nzb_si + vi
[1353]	1714	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1715	SQRT( 0.25_wp * dx**2 + &
[1]	1716	( zu(k) - zw(nzb_si) )**2 ) )
	1717	ENDDO
	1718
	1719	ENDIF
	1720
	1721	ENDDO
	1722	ENDDO
	1723
	1724	ENDIF
	1725
	1726	!
	1727	!-- Multiplication with wall_adjustment_factor
	1728	l_wall = wall_adjustment_factor * l_wall
	1729
	1730	!
[709]	1731	!-- Set lateral boundary conditions for l_wall
[667]	1732	CALL exchange_horiz( l_wall, nbgp )
	1733
[1]	1734	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1735	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1736
	1737
	1738	END SUBROUTINE init_grid

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