Home

Context Navigation

source: palm/trunk/SOURCE/init_grid.f90 @ 1812

Last change on this file since 1812 was 1805, checked in by maronga, 9 years ago
last commit documented
Property svn:keywords set to `Id`
File size: 69.3 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	!
[1691]	16	! Copyright 1997-2015 Leibniz Universitaet Hannover
[1743]	17	!-------------------------------------------------------------------------------!
[1036]	18	!
[254]	19	! Current revisions:
[1]	20	! -----------------
[1805]	21	!
	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: init_grid.f90 1805 2016-04-05 16:32:34Z knoop $
	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, &
	182	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	183	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	184	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	185	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	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), &
	472	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	473	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	474	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	475	wall_e_x(nysg:nyng,nxlg:nxrg), &
	476	wall_e_y(nysg:nyng,nxlg:nxrg), &
	477	wall_u(nysg:nyng,nxlg:nxrg), &
	478	wall_v(nysg:nyng,nxlg:nxrg), &
	479	wall_w_x(nysg:nyng,nxlg:nxrg), &
	480	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	481
	482
[667]	483
	484	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	485
[818]	486
[1]	487	nzb_s_inner = nzb; nzb_s_outer = nzb
	488	nzb_u_inner = nzb; nzb_u_outer = nzb
	489	nzb_v_inner = nzb; nzb_v_outer = nzb
	490	nzb_w_inner = nzb; nzb_w_outer = nzb
	491
[1353]	492	rflags_s_inner = 1.0_wp
	493	rflags_invers = 1.0_wp
[1221]	494
[1]	495	!
[19]	496	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	497	!-- form (which does not use surface fluxes) is applied
[1691]	498	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	499	nzb_diff = nzb + 2
	500	ELSE
	501	nzb_diff = nzb + 1
	502	ENDIF
[19]	503	IF ( use_top_fluxes ) THEN
	504	nzt_diff = nzt - 1
	505	ELSE
	506	nzt_diff = nzt
	507	ENDIF
[1]	508
	509	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	510	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	511
[1353]	512	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	513	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	514	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	515	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	516
	517	!
	518	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	519	!-- for the moment,
	520	!-- multiplication with wall_adjustment_factor near the end of this routine
	521	l_wall(nzb,:,:) = l_grid(1)
	522	DO k = nzb+1, nzt
	523	l_wall(k,:,:) = l_grid(k)
	524	ENDDO
	525	l_wall(nzt+1,:,:) = l_grid(nzt)
	526
	527	ALLOCATE ( vertical_influence(nzb:nzt) )
	528	DO k = 1, nzt
	529	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	530	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	531	ENDDO
	532
	533	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	534	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	535	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	536	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	537	'threshold given by only local', &
	538	' &horizontal reduction of near_wall ', &
	539	'mixing length l_wall', &
	540	' &starting from height level k = ', k, '.'
	541	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	542	EXIT
	543	ENDIF
	544	ENDDO
	545	vertical_influence(0) = vertical_influence(1)
	546
[667]	547	DO i = nxlg, nxrg
	548	DO j = nysg, nyng
[1]	549	DO k = nzb_s_inner(j,i) + 1, &
	550	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	551	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	552	ENDDO
	553	ENDDO
	554	ENDDO
	555
	556	!
	557	!-- Set outer and inner index arrays for non-flat topography.
	558	!-- Here consistency checks concerning domain size and periodicity are
	559	!-- necessary.
	560	!-- Within this SELECT CASE structure only nzb_local is initialized
	561	!-- individually depending on the chosen topography type, all other index
	562	!-- arrays are initialized further below.
	563	SELECT CASE ( TRIM( topography ) )
	564
	565	CASE ( 'flat' )
	566	!
[555]	567	!-- nzb_local is required for the multigrid solver
	568	nzb_local = 0
[1]	569
	570	CASE ( 'single_building' )
	571	!
	572	!-- Single rectangular building, by default centered in the middle of the
	573	!-- total domain
	574	blx = NINT( building_length_x / dx )
	575	bly = NINT( building_length_y / dy )
[1675]	576	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	577	IF ( ABS( zw(bh ) - building_height ) == &
	578	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	579
[1322]	580	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	581	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	582	ENDIF
	583	bxl = NINT( building_wall_left / dx )
	584	bxr = bxl + blx
	585
[1322]	586	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	587	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	588	ENDIF
	589	bys = NINT( building_wall_south / dy )
	590	byn = bys + bly
	591
	592	!
	593	!-- Building size has to meet some requirements
	594	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	595	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	596	WRITE( message_string, * ) 'inconsistent building parameters:', &
	597	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	598	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	599	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	600	ENDIF
	601
	602	!
[217]	603	!-- Define the building.
[1]	604	nzb_local = 0
[134]	605	nzb_local(bys:byn,bxl:bxr) = bh
[1]	606
[240]	607	CASE ( 'single_street_canyon' )
	608	!
	609	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	610	!-- The canyon is centered in the other direction by default.
[1322]	611	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	612	!
	613	!-- Street canyon in y direction
	614	cwx = NINT( canyon_width_x / dx )
[1322]	615	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	616	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	617	ENDIF
	618	cxl = NINT( canyon_wall_left / dx )
	619	cxr = cxl + cwx
	620
[1322]	621	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	622	!
	623	!-- Street canyon in x direction
	624	cwy = NINT( canyon_width_y / dy )
[1322]	625	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	626	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	627	ENDIF
	628	cys = NINT( canyon_wall_south / dy )
	629	cyn = cys + cwy
	630
	631	ELSE
[254]	632
	633	message_string = 'no street canyon width given'
	634	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	635
[240]	636	ENDIF
	637
[1675]	638	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	639	IF ( ABS( zw(ch ) - canyon_height ) == &
	640	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	641
[240]	642	dp_level_ind_b = ch
	643	!
	644	!-- Street canyon size has to meet some requirements
[1322]	645	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	646	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	647	( ch < 3 ) ) THEN
[1353]	648	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	649	'&cxl=', cxl, 'cxr=', cxr, &
	650	'cwx=', cwx, &
[254]	651	'ch=', ch, 'nx=', nx, 'ny=', ny
	652	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	653	ENDIF
[1322]	654	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	655	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	656	( ch < 3 ) ) THEN
[1353]	657	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	658	'&cys=', cys, 'cyn=', cyn, &
	659	'cwy=', cwy, &
[254]	660	'ch=', ch, 'nx=', nx, 'ny=', ny
	661	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	662	ENDIF
	663	ENDIF
[1353]	664	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	665	canyon_width_y /= 9999999.9_wp ) THEN
	666	message_string = 'inconsistent canyon parameters:' // &
	667	'&street canyon can only be oriented' // &
[254]	668	'&either in x- or in y-direction'
	669	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	670	ENDIF
	671
	672	nzb_local = ch
[1322]	673	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	674	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	675	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	676	nzb_local(cys+1:cyn-1,:) = 0
	677	ENDIF
	678
[1]	679	CASE ( 'read_from_file' )
[759]	680
[818]	681	ALLOCATE ( topo_height(0:ny,0:nx) )
	682
[759]	683	DO ii = 0, io_blocks-1
	684	IF ( ii == io_group ) THEN
	685
[1]	686	!
[759]	687	!-- Arbitrary irregular topography data in PALM format (exactly
	688	!-- matching the grid size and total domain size)
[1779]	689	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	690	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[759]	691	DO j = ny, 0, -1
	692	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	693	ENDDO
	694
	695	GOTO 12
	696
[1779]	697	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	698	' does not exist'
[759]	699	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	700
[1779]	701	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	702	TRIM( coupling_char )
[759]	703	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	704
	705	12 CLOSE( 90 )
	706
	707	ENDIF
[1804]	708	#if defined( __parallel )
[759]	709	CALL MPI_BARRIER( comm2d, ierr )
	710	#endif
[559]	711	ENDDO
[759]	712
[1]	713	!
	714	!-- Calculate the index height of the topography
	715	DO i = 0, nx
	716	DO j = 0, ny
[1675]	717	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	718	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	719	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	720	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	721	ENDDO
	722	ENDDO
[818]	723
	724	DEALLOCATE ( topo_height )
[114]	725	!
[759]	726	!-- Add cyclic boundaries (additional layers are for calculating
	727	!-- flag arrays needed for the multigrid sover)
[114]	728	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	729	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	730	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	731	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	732
[1]	733	CASE DEFAULT
	734	!
	735	!-- The DEFAULT case is reached either if the parameter topography
[217]	736	!-- contains a wrong character string or if the user has defined a special
[1]	737	!-- case in the user interface. There, the subroutine user_init_grid
	738	!-- checks which of these two conditions applies.
[114]	739	CALL user_init_grid( gls, nzb_local )
[1]	740
	741	END SELECT
	742	!
[861]	743	!-- Determine the maximum level of topography. Furthermore it is used for
	744	!-- steering the degradation of order of the applied advection scheme.
[978]	745	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	746	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	747	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	748	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	749	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	750	nest_domain ) &
	751	THEN
	752	nzb_max = nzt
[978]	753	ENDIF
	754
[861]	755	!
[1]	756	!-- Consistency checks and index array initialization are only required for
[217]	757	!-- non-flat topography, also the initialization of topography height arrays
[49]	758	!-- zu_s_inner and zw_w_inner
[1]	759	IF ( TRIM( topography ) /= 'flat' ) THEN
	760
	761	!
	762	!-- Consistency checks
	763	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	764	WRITE( message_string, * ) 'nzb_local values are outside the', &
	765	'model domain', &
	766	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	767	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	768	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	769	ENDIF
	770
[722]	771	IF ( bc_lr == 'cyclic' ) THEN
[1353]	772	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	773	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	774	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	775	' boundary condition in x-direction'
	776	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	777	ENDIF
	778	ENDIF
[722]	779	IF ( bc_ns == 'cyclic' ) THEN
[1353]	780	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	781	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	782	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	783	' boundary condition in y-direction'
	784	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	785	ENDIF
	786	ENDIF
	787
[217]	788	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	789	!
[217]	790	!-- The array nzb_local as defined using the 'cell_edge' convention
	791	!-- describes the actual total size of topography which is defined at the
	792	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	793	!-- on the topography walls in y-direction. However, PALM uses individual
	794	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	795	!-- Therefore, the extent of topography in nzb_local is now reduced by
	796	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	797	!-- to form the basis for nzb_s_inner.
	798	DO j = -gls, ny + gls
	799	DO i = -gls, nx
	800	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	801	ENDDO
[134]	802	ENDDO
[217]	803	!-- apply cyclic boundary conditions in x-direction
	804	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	805	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	806	DO i = -gls, nx + gls
	807	DO j = -gls, ny
	808	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	809	ENDDO
[134]	810	ENDDO
[217]	811	!-- apply cyclic boundary conditions in y-direction
	812	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	813	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	814	ENDIF
[134]	815
[1]	816	!
	817	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	818	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	819	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	820
	821	!
	822	!-- Initialize remaining index arrays:
	823	!-- first pre-initialize them with nzb_s_inner...
	824	nzb_u_inner = nzb_s_inner
	825	nzb_u_outer = nzb_s_inner
	826	nzb_v_inner = nzb_s_inner
	827	nzb_v_outer = nzb_s_inner
	828	nzb_w_outer = nzb_s_inner
	829	nzb_s_outer = nzb_s_inner
	830
	831	!
	832	!-- ...then extend pre-initialized arrays in their according directions
	833	!-- based on nzb_local using nzb_tmp as a temporary global index array
	834
	835	!
	836	!-- nzb_s_outer:
	837	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	838	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	839	DO j = -1, ny + 1
	840	DO i = 0, nx
[1353]	841	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	842	nzb_local(j,i+1) )
	843	ENDDO
	844	ENDDO
	845	DO i = nxl, nxr
	846	DO j = nys, nyn
[1353]	847	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	848	nzb_tmp(j+1,i) )
	849	ENDDO
	850	!
	851	!-- non-cyclic boundary conditions (overwritten by call of
	852	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	853	IF ( nys == 0 ) THEN
	854	j = -1
	855	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	856	ENDIF
[1743]	857	IF ( nyn == ny ) THEN
[1]	858	j = ny + 1
	859	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	860	ENDIF
	861	ENDDO
	862	!
	863	!-- nzb_w_outer:
	864	!-- identical to nzb_s_outer
	865	nzb_w_outer = nzb_s_outer
	866
	867	!
	868	!-- nzb_u_inner:
	869	!-- extend nzb_local rightwards only
[667]	870	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	871	DO j = -1, ny + 1
	872	DO i = 0, nx + 1
	873	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	874	ENDDO
	875	ENDDO
[667]	876	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	877
	878	!
	879	!-- nzb_u_outer:
	880	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	881	DO i = nxl, nxr
	882	DO j = nys, nyn
[1353]	883	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	884	nzb_tmp(j+1,i) )
	885	ENDDO
	886	!
	887	!-- non-cyclic boundary conditions (overwritten by call of
	888	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	889	IF ( nys == 0 ) THEN
	890	j = -1
	891	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	892	ENDIF
[1743]	893	IF ( nyn == ny ) THEN
[1]	894	j = ny + 1
	895	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	896	ENDIF
	897	ENDDO
	898
	899	!
	900	!-- nzb_v_inner:
	901	!-- extend nzb_local northwards only
[667]	902	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	903	DO i = -1, nx + 1
	904	DO j = 0, ny + 1
	905	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	906	ENDDO
	907	ENDDO
[667]	908	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	909
	910	!
	911	!-- nzb_v_outer:
	912	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	913	DO j = nys, nyn
	914	DO i = nxl, nxr
[1353]	915	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	916	nzb_tmp(j,i+1) )
	917	ENDDO
	918	!
	919	!-- non-cyclic boundary conditions (overwritten by call of
	920	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	921	IF ( nxl == 0 ) THEN
	922	i = -1
	923	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	924	ENDIF
	925	IF ( nxr == nx ) THEN
	926	i = nx + 1
	927	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	928	ENDIF
	929	ENDDO
[1804]	930
[1]	931	!
	932	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	933	!-- boundary conditions, if applicable.
	934	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	935	!-- they do not require exchange and are not included here.
	936	CALL exchange_horiz_2d_int( nzb_u_inner )
	937	CALL exchange_horiz_2d_int( nzb_u_outer )
	938	CALL exchange_horiz_2d_int( nzb_v_inner )
	939	CALL exchange_horiz_2d_int( nzb_v_outer )
	940	CALL exchange_horiz_2d_int( nzb_w_outer )
	941	CALL exchange_horiz_2d_int( nzb_s_outer )
	942
[49]	943	!
	944	!-- Allocate and set the arrays containing the topography height
	945	IF ( myid == 0 ) THEN
	946
	947	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	948
	949	DO i = 0, nx + 1
	950	DO j = 0, ny + 1
	951	zu_s_inner(i,j) = zu(nzb_local(j,i))
	952	zw_w_inner(i,j) = zw(nzb_local(j,i))
	953	ENDDO
	954	ENDDO
	955
	956	ENDIF
[1221]	957	!
	958	!-- Set flag arrays to be used for masking of grid points
	959	DO i = nxlg, nxrg
	960	DO j = nysg, nyng
	961	DO k = nzb, nzt+1
[1353]	962	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	963	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	964	ENDDO
	965	ENDDO
	966	ENDDO
[1804]	967
[1]	968	ENDIF
	969
	970	!
	971	!-- Preliminary: to be removed after completion of the topography code!
	972	!-- Set the former default k index arrays nzb_2d
	973	nzb_2d = nzb
	974
	975	!
	976	!-- Set the individual index arrays which define the k index from which on
	977	!-- the usual finite difference form (which does not use surface fluxes) is
	978	!-- applied
[1691]	979	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	980	nzb_diff_u = nzb_u_inner + 2
	981	nzb_diff_v = nzb_v_inner + 2
	982	nzb_diff_s_inner = nzb_s_inner + 2
	983	nzb_diff_s_outer = nzb_s_outer + 2
	984	ELSE
	985	nzb_diff_u = nzb_u_inner + 1
	986	nzb_diff_v = nzb_v_inner + 1
	987	nzb_diff_s_inner = nzb_s_inner + 1
	988	nzb_diff_s_outer = nzb_s_outer + 1
	989	ENDIF
	990
	991	!
	992	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	993	!-- for limitation of near-wall mixing length l_wall further below
	994	corner_nl = 0
	995	corner_nr = 0
	996	corner_sl = 0
	997	corner_sr = 0
	998	wall_l = 0
	999	wall_n = 0
	1000	wall_r = 0
	1001	wall_s = 0
	1002
	1003	DO i = nxl, nxr
	1004	DO j = nys, nyn
	1005	!
	1006	!-- u-component
	1007	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1008	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1009	fym(j,i) = 0.0_wp
	1010	fyp(j,i) = 1.0_wp
[1]	1011	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1012	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1013	fym(j,i) = 1.0_wp
	1014	fyp(j,i) = 0.0_wp
[1]	1015	ENDIF
	1016	!
	1017	!-- v-component
	1018	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1019	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1020	fxm(j,i) = 0.0_wp
	1021	fxp(j,i) = 1.0_wp
[1]	1022	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1023	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1024	fxm(j,i) = 1.0_wp
	1025	fxp(j,i) = 0.0_wp
[1]	1026	ENDIF
	1027	!
	1028	!-- w-component, also used for scalars, separate arrays for shear
	1029	!-- production of tke
	1030	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1031	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1032	wall_w_y(j,i) = 1.0_wp
	1033	fwym(j,i) = 0.0_wp
	1034	fwyp(j,i) = 1.0_wp
[1]	1035	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1036	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1037	wall_w_y(j,i) = 1.0_wp
	1038	fwym(j,i) = 1.0_wp
	1039	fwyp(j,i) = 0.0_wp
[1]	1040	ENDIF
	1041	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1042	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1043	wall_w_x(j,i) = 1.0_wp
	1044	fwxm(j,i) = 0.0_wp
	1045	fwxp(j,i) = 1.0_wp
[1]	1046	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1047	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1048	wall_w_x(j,i) = 1.0_wp
	1049	fwxm(j,i) = 1.0_wp
	1050	fwxp(j,i) = 0.0_wp
[1]	1051	ENDIF
	1052	!
	1053	!-- Wall and corner locations inside buildings for limitation of
	1054	!-- near-wall mixing length l_wall
	1055	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1056
	1057	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1058
	1059	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1060	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1061	nzb_s_inner(j,i-1) ) + 1
	1062	ENDIF
	1063
	1064	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1065	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1066	nzb_s_inner(j,i+1) ) + 1
	1067	ENDIF
	1068
	1069	ENDIF
	1070
	1071	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1072
	1073	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1074	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1075	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1076	nzb_s_inner(j,i-1) ) + 1
	1077	ENDIF
	1078
	1079	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1080	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1081	nzb_s_inner(j,i+1) ) + 1
	1082	ENDIF
	1083
	1084	ENDIF
	1085
	1086	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1087	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1088	ENDIF
	1089
	1090	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1091	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1092	ENDIF
	1093
	1094	ENDDO
	1095	ENDDO
	1096
	1097	!
[114]	1098	!-- Calculate wall flag arrays for the multigrid method
[1575]	1099	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1100	!
	1101	!-- Gridpoint increment of the current level
	1102	inc = 1
	1103
	1104	DO l = maximum_grid_level, 1 , -1
	1105
	1106	nxl_l = nxl_mg(l)
	1107	nxr_l = nxr_mg(l)
	1108	nys_l = nys_mg(l)
	1109	nyn_l = nyn_mg(l)
	1110	nzt_l = nzt_mg(l)
	1111
	1112	!
	1113	!-- Assign the flag level to be calculated
	1114	SELECT CASE ( l )
	1115	CASE ( 1 )
	1116	flags => wall_flags_1
	1117	CASE ( 2 )
	1118	flags => wall_flags_2
	1119	CASE ( 3 )
	1120	flags => wall_flags_3
	1121	CASE ( 4 )
	1122	flags => wall_flags_4
	1123	CASE ( 5 )
	1124	flags => wall_flags_5
	1125	CASE ( 6 )
	1126	flags => wall_flags_6
	1127	CASE ( 7 )
	1128	flags => wall_flags_7
	1129	CASE ( 8 )
	1130	flags => wall_flags_8
	1131	CASE ( 9 )
	1132	flags => wall_flags_9
	1133	CASE ( 10 )
	1134	flags => wall_flags_10
	1135	END SELECT
	1136
	1137	!
	1138	!-- Depending on the grid level, set the respective bits in case of
	1139	!-- neighbouring walls
	1140	!-- Bit 0: wall to the bottom
	1141	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1142	!-- Bit 2: wall to the south
	1143	!-- Bit 3: wall to the north
	1144	!-- Bit 4: wall to the left
	1145	!-- Bit 5: wall to the right
[116]	1146	!-- Bit 6: inside building
[114]	1147
	1148	flags = 0
	1149
[927]	1150	!
	1151	!-- In case of masking method, flags are not set and multigrid method
	1152	!-- works like FFT-solver
	1153	IF ( .NOT. masking_method ) THEN
	1154
	1155	DO i = nxl_l-1, nxr_l+1
	1156	DO j = nys_l-1, nyn_l+1
	1157	DO k = nzb, nzt_l+1
[114]	1158
	1159	!
[927]	1160	!-- Inside/outside building (inside building does not need
	1161	!-- further tests for walls)
	1162	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1163
[927]	1164	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1165
[927]	1166	ELSE
[114]	1167	!
[927]	1168	!-- Bottom wall
	1169	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1170	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1171	ENDIF
[114]	1172	!
[927]	1173	!-- South wall
	1174	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1175	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1176	ENDIF
[114]	1177	!
[927]	1178	!-- North wall
	1179	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1180	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1181	ENDIF
[114]	1182	!
[927]	1183	!-- Left wall
	1184	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1185	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1186	ENDIF
[114]	1187	!
[927]	1188	!-- Right wall
	1189	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1190	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1191	ENDIF
	1192
[114]	1193	ENDIF
	1194
[927]	1195	ENDDO
[114]	1196	ENDDO
	1197	ENDDO
	1198
[927]	1199	ENDIF
	1200
[114]	1201	!
	1202	!-- Test output of flag arrays
[145]	1203	! i = nxl_l
	1204	! WRITE (9,*) ' '
	1205	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1206	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1207	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1208	! DO k = nzt_l+1, nzb, -1
	1209	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1210	! ENDDO
[114]	1211
	1212	inc = inc * 2
	1213
	1214	ENDDO
	1215
	1216	ENDIF
[861]	1217	!
	1218	!-- Allocate flags needed for masking walls.
[1677]	1219	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1220	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1221	wall_flags_0 = 0
	1222	wall_flags_00 = 0
[114]	1223
[1557]	1224	IF ( scalar_advec == 'ws-scheme' .OR. &
	1225	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1226	!
[861]	1227	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1228	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1229	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1230	!-- grid points.
	1231	DO i = nxl, nxr
	1232	DO j = nys, nyn
	1233	DO k = nzb_s_inner(j,i)+1, nzt
	1234	!
	1235	!-- scalar - x-direction
	1236	!-- WS1 (0), WS3 (1), WS5 (2)
[1762]	1237	IF ( k <= nzb_s_inner(j,i+1) .OR. &
	1238	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1239	.AND. i == nxl ) .OR. &
	1240	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1241	.AND. i == nxr ) ) &
	1242	THEN
[861]	1243	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1244	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[1762]	1245	.OR. &
	1246	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1247	.AND. i == nxr-1 ) .OR. &
	1248	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1249	.AND. i == nxlu ) ) &
	1250	THEN
[861]	1251	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1252	ELSE
	1253	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1254	ENDIF
	1255	!
	1256	!-- scalar - y-direction
	1257	!-- WS1 (3), WS3 (4), WS5 (5)
[1762]	1258	IF ( k <= nzb_s_inner(j+1,i) .OR. &
	1259	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1260	.AND. j == nys ) .OR. &
	1261	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1262	.AND. j == nyn ) ) &
	1263	THEN
[861]	1264	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
[1762]	1265	!
[861]	1266	!-- WS3
	1267	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[1762]	1268	.OR. &
	1269	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1270	.AND. j == nysv ) .OR. &
	1271	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1272	.AND. j == nyn-1 ) ) &
	1273	THEN
[861]	1274	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
[1762]	1275	!
[861]	1276	!-- WS5
	1277	ELSE
	1278	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1279	ENDIF
	1280	!
	1281	!-- scalar - z-direction
	1282	!-- WS1 (6), WS3 (7), WS5 (8)
	1283	flag_set = .FALSE.
	1284	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1285	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1286	flag_set = .TRUE.
	1287	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1288	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1289	flag_set = .TRUE.
	1290	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1291	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1292	ENDIF
	1293	ENDDO
	1294	ENDDO
	1295	ENDDO
	1296	ENDIF
	1297
	1298	IF ( momentum_advec == 'ws-scheme' ) THEN
	1299	!
	1300	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1301	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1302	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1303	!-- grid points.
	1304	DO i = nxl, nxr
	1305	DO j = nys, nyn
[1580]	1306	DO k = nzb+1, nzt
[861]	1307	!
[1580]	1308	!-- At first, set flags to WS1.
	1309	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1310	!-- in order to handle the left/south flux.
	1311	!-- near vertical walls.
	1312	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1313	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1314	!
[861]	1315	!-- u component - x-direction
	1316	!-- WS1 (9), WS3 (10), WS5 (11)
[1762]	1317	IF ( k <= nzb_u_inner(j,i+1) .OR. &
	1318	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1319	.AND. i <= nxlu ) .OR. &
	1320	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1321	.AND. i == nxr ) ) &
	1322	THEN
[1580]	1323	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[1762]	1324	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
	1325	.OR. &
	1326	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1327	.AND. i == nxr-1 ) .OR. &
	1328	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1329	.AND. i == nxlu+1) ) &
	1330	THEN
[861]	1331	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1332	!
	1333	!-- Clear flag for WS1
	1334	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1335	ELSE
	1336	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1337	!
	1338	!-- Clear flag for WS1
	1339	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1340	ENDIF
	1341	!
	1342	!-- u component - y-direction
	1343	!-- WS1 (12), WS3 (13), WS5 (14)
[1762]	1344	IF ( k <= nzb_u_inner(j+1,i) .OR. &
	1345	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1346	.AND. j == nys ) .OR. &
	1347	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1348	.AND. j == nyn ) ) &
	1349	THEN
	1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1351	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[1762]	1352	.OR. &
	1353	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1354	.AND. j == nysv ) .OR. &
	1355	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1356	.AND. j == nyn-1 ) ) &
	1357	THEN
[861]	1358	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1359	!
	1360	!-- Clear flag for WS1
	1361	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1362	ELSE
	1363	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1364	!
	1365	!-- Clear flag for WS1
	1366	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1367	ENDIF
	1368	!
	1369	!-- u component - z-direction
	1370	!-- WS1 (15), WS3 (16), WS5 (17)
	1371	flag_set = .FALSE.
	1372	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1373	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1374	flag_set = .TRUE.
	1375	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1376	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1377	flag_set = .TRUE.
	1378	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1379	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1380	ENDIF
	1381
	1382	ENDDO
	1383	ENDDO
	1384	ENDDO
	1385
	1386	DO i = nxl, nxr
	1387	DO j = nys, nyn
[1580]	1388	DO k = nzb+1, nzt
[861]	1389	!
[1580]	1390	!-- At first, set flags to WS1.
	1391	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1392	!-- in order to handle the left/south flux.
	1393	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1394	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1395	!
[861]	1396	!-- v component - x-direction
	1397	!-- WS1 (18), WS3 (19), WS5 (20)
[1762]	1398	IF ( k <= nzb_v_inner(j,i+1) .OR. &
	1399	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1400	.AND. i == nxl ) .OR. &
	1401	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1402	.AND. i == nxr ) ) &
	1403	THEN
	1404	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1405	!
[861]	1406	!-- WS3
	1407	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[1762]	1408	.OR. &
	1409	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1410	.AND. i == nxr-1 ) .OR. &
	1411	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1412	.AND. i == nxlu ) ) &
	1413	THEN
[861]	1414	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1415	!
	1416	!-- Clear flag for WS1
	1417	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1418	ELSE
	1419	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1420	!
	1421	!-- Clear flag for WS1
	1422	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1423	ENDIF
	1424	!
	1425	!-- v component - y-direction
	1426	!-- WS1 (21), WS3 (22), WS5 (23)
[1762]	1427	IF ( k <= nzb_v_inner(j+1,i) .OR. &
	1428	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1429	.AND. j <= nysv ) .OR. &
	1430	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1431	.AND. j == nyn ) ) &
	1432	THEN
	1433	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1434	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[1762]	1435	.OR. &
	1436	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1437	.AND. j == nysv+1) .OR. &
	1438	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1439	.AND. j == nyn-1 ) ) &
	1440	THEN
[861]	1441	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1442	!
	1443	!-- Clear flag for WS1
	1444	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1445	ELSE
	1446	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1447	!
	1448	!-- Clear flag for WS1
	1449	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1450	ENDIF
	1451	!
	1452	!-- v component - z-direction
	1453	!-- WS1 (24), WS3 (25), WS5 (26)
	1454	flag_set = .FALSE.
	1455	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1456	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1457	flag_set = .TRUE.
	1458	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1459	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1460	flag_set = .TRUE.
	1461	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1462	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1463	ENDIF
	1464
	1465	ENDDO
	1466	ENDDO
	1467	ENDDO
	1468	DO i = nxl, nxr
	1469	DO j = nys, nyn
[1580]	1470	DO k = nzb+1, nzt
[861]	1471	!
[1580]	1472	!-- At first, set flags to WS1.
	1473	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1474	!-- in order to handle the left/south flux.
	1475	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1476	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1477	!
[861]	1478	!-- w component - x-direction
	1479	!-- WS1 (27), WS3 (28), WS5 (29)
[1762]	1480	IF ( k <= nzb_w_inner(j,i+1) .OR. &
	1481	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1482	.AND. i == nxl ) .OR. &
	1483	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1484	.AND. i == nxr ) ) &
	1485	THEN
	1486	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1487	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[1762]	1488	.OR. &
	1489	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1490	.AND. i == nxr-1 ) .OR. &
	1491	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1492	.AND. i == nxlu ) ) &
	1493	THEN
[861]	1494	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1495	!
	1496	!-- Clear flag for WS1
	1497	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1498	ELSE
	1499	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1500	!
	1501	!-- Clear flag for WS1
	1502	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1503	ENDIF
	1504	!
	1505	!-- w component - y-direction
	1506	!-- WS1 (30), WS3 (31), WS5 (32)
[1762]	1507	IF ( k <= nzb_w_inner(j+1,i) .OR. &
	1508	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1509	.AND. j == nys ) .OR. &
	1510	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1511	.AND. j == nyn ) ) &
	1512	THEN
	1513	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1514	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[1762]	1515	.OR. &
	1516	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1517	.AND. j == nysv ) .OR. &
	1518	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1519	.AND. j == nyn-1 ) ) &
	1520	THEN
[861]	1521	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1522	!
	1523	!-- Clear flag for WS1
	1524	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1525	ELSE
[1221]	1526	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1527	!
	1528	!-- Clear flag for WS1
	1529	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1530	ENDIF
	1531	!
	1532	!-- w component - z-direction
[1679]	1533	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1534	flag_set = .FALSE.
	1535	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1536	.OR. k == nzt ) THEN
	1537	!
	1538	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1539	!-- set, although this is not a prognostic level. However,
	1540	!-- contrary to the advection of u,v and s this is necessary
	1541	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1542	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1543	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1544	flag_set = .TRUE.
	1545	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1546	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1547	flag_set = .TRUE.
	1548	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1549	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1550	ENDIF
	1551
	1552	ENDDO
	1553	ENDDO
	1554	ENDDO
	1555
	1556	ENDIF
	1557
	1558	!
[1677]	1559	!-- Exchange 3D integer wall_flags.
	1560	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1561	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1562	!
	1563	!-- Exchange ghost points for advection flags
	1564	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1565	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1566	!
	1567	!-- Set boundary flags at inflow and outflow boundary in case of
	1568	!-- non-cyclic boundary conditions.
[1762]	1569	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1677]	1570	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1571	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1572	ENDIF
	1573
[1762]	1574	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
[1677]	1575	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1576	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1577	ENDIF
	1578
[1762]	1579	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
[1677]	1580	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1581	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1582	ENDIF
	1583
[1762]	1584	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1677]	1585	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1586	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1587	ENDIF
	1588
	1589	ENDIF
	1590
	1591	!
[1]	1592	!-- In case of topography: limit near-wall mixing length l_wall further:
	1593	!-- Go through all points of the subdomain one by one and look for the closest
	1594	!-- surface
	1595	IF ( TRIM(topography) /= 'flat' ) THEN
	1596	DO i = nxl, nxr
	1597	DO j = nys, nyn
	1598
	1599	nzb_si = nzb_s_inner(j,i)
	1600	vi = vertical_influence(nzb_si)
	1601
	1602	IF ( wall_n(j,i) > 0 ) THEN
	1603	!
	1604	!-- North wall (y distance)
	1605	DO k = wall_n(j,i), nzb_si
[1353]	1606	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1607	ENDDO
	1608	!
	1609	!-- Above North wall (yz distance)
	1610	DO k = nzb_si + 1, nzb_si + vi
[1353]	1611	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1612	SQRT( 0.25_wp * dy**2 + &
[1]	1613	( zu(k) - zw(nzb_si) )**2 ) )
	1614	ENDDO
	1615	!
	1616	!-- Northleft corner (xy distance)
	1617	IF ( corner_nl(j,i) > 0 ) THEN
	1618	DO k = corner_nl(j,i), nzb_si
	1619	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1620	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1621	ENDDO
	1622	!
	1623	!-- Above Northleft corner (xyz distance)
	1624	DO k = nzb_si + 1, nzb_si + vi
[1353]	1625	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1626	SQRT( 0.25_wp * (dx2 + dy2) + &
	1627	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1628	ENDDO
	1629	ENDIF
	1630	!
	1631	!-- Northright corner (xy distance)
	1632	IF ( corner_nr(j,i) > 0 ) THEN
	1633	DO k = corner_nr(j,i), nzb_si
[1353]	1634	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1635	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1636	ENDDO
	1637	!
	1638	!-- Above northright corner (xyz distance)
	1639	DO k = nzb_si + 1, nzb_si + vi
[1353]	1640	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1641	SQRT( 0.25_wp * (dx2 + dy2) + &
	1642	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1643	ENDDO
	1644	ENDIF
	1645	ENDIF
	1646
	1647	IF ( wall_s(j,i) > 0 ) THEN
	1648	!
	1649	!-- South wall (y distance)
	1650	DO k = wall_s(j,i), nzb_si
[1353]	1651	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1652	ENDDO
	1653	!
	1654	!-- Above south wall (yz distance)
[1353]	1655	DO k = nzb_si + 1, nzb_si + vi
	1656	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1657	SQRT( 0.25_wp * dy**2 + &
[1]	1658	( zu(k) - zw(nzb_si) )**2 ) )
	1659	ENDDO
	1660	!
	1661	!-- Southleft corner (xy distance)
	1662	IF ( corner_sl(j,i) > 0 ) THEN
	1663	DO k = corner_sl(j,i), nzb_si
[1353]	1664	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1665	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1666	ENDDO
	1667	!
	1668	!-- Above southleft corner (xyz distance)
	1669	DO k = nzb_si + 1, nzb_si + vi
[1353]	1670	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1671	SQRT( 0.25_wp * (dx2 + dy2) + &
	1672	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1673	ENDDO
	1674	ENDIF
	1675	!
	1676	!-- Southright corner (xy distance)
	1677	IF ( corner_sr(j,i) > 0 ) THEN
	1678	DO k = corner_sr(j,i), nzb_si
[1353]	1679	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1680	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1681	ENDDO
	1682	!
	1683	!-- Above southright corner (xyz distance)
	1684	DO k = nzb_si + 1, nzb_si + vi
[1353]	1685	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1686	SQRT( 0.25_wp * (dx2 + dy2) + &
	1687	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1688	ENDDO
	1689	ENDIF
	1690
	1691	ENDIF
	1692
	1693	IF ( wall_l(j,i) > 0 ) THEN
	1694	!
	1695	!-- Left wall (x distance)
	1696	DO k = wall_l(j,i), nzb_si
[1353]	1697	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1698	ENDDO
	1699	!
	1700	!-- Above left wall (xz distance)
	1701	DO k = nzb_si + 1, nzb_si + vi
[1353]	1702	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1703	SQRT( 0.25_wp * dx**2 + &
	1704	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1705	ENDDO
	1706	ENDIF
	1707
	1708	IF ( wall_r(j,i) > 0 ) THEN
	1709	!
	1710	!-- Right wall (x distance)
	1711	DO k = wall_r(j,i), nzb_si
[1353]	1712	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1713	ENDDO
	1714	!
	1715	!-- Above right wall (xz distance)
	1716	DO k = nzb_si + 1, nzb_si + vi
[1353]	1717	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1718	SQRT( 0.25_wp * dx**2 + &
[1]	1719	( zu(k) - zw(nzb_si) )**2 ) )
	1720	ENDDO
	1721
	1722	ENDIF
	1723
	1724	ENDDO
	1725	ENDDO
	1726
	1727	ENDIF
	1728
	1729	!
	1730	!-- Multiplication with wall_adjustment_factor
	1731	l_wall = wall_adjustment_factor * l_wall
	1732
	1733	!
[709]	1734	!-- Set lateral boundary conditions for l_wall
[667]	1735	CALL exchange_horiz( l_wall, nbgp )
	1736
[1]	1737	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1738	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1739
	1740
	1741	END SUBROUTINE init_grid

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

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |