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source: palm/trunk/SOURCE/init_grid.f90 @ 2223

Last change on this file since 2223 was 2201, checked in by suehring, 8 years ago
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[1682]	1	!> @file init_grid.f90
[2000]	2	!------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
[2000]	5	! PALM is free software: you can redistribute it and/or modify it under the
	6	! terms of the GNU General Public License as published by the Free Software
	7	! Foundation, either version 3 of the License, or (at your option) any later
	8	! version.
[1036]	9	!
	10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	13	!
	14	! You should have received a copy of the GNU General Public License along with
	15	! PALM. If not, see <http://www.gnu.org/licenses/>.
	16	!
[2101]	17	! Copyright 1997-2017 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[1969]	22	!
[2201]	23	!
[1969]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 2201 2017-04-11 11:39:25Z suehring $
	27	!
[2201]	28	! 2200 2017-04-11 11:37:51Z suehring
	29	! monotonic_adjustment removed
	30	!
[2170]	31	! 2169 2017-03-06 18:16:35Z suehring
	32	! Bugfix, move setting for topography grid convention to init_grid, else, if no
	33	! value is set, the simulation may abort in case of restarts
	34	!
[2129]	35	! 2128 2017-01-23 15:00:03Z suehring
	36	! Bugfix in setting topography from file in case of ocean simulations
	37	!
[2089]	38	! 2088 2016-12-19 16:30:25Z suehring
	39	! Bugfix in generic topography in case of ocean simulations
	40	!
[2038]	41	! 2037 2016-10-26 11:15:40Z knoop
	42	! Anelastic approximation implemented
	43	!
[2022]	44	! 2021 2016-10-07 14:08:57Z suehring
	45	! Bugfix: setting Neumann boundary conditions for topography required for
	46	! topography flags in multigrid_noopt solver
	47	!
[2001]	48	! 2000 2016-08-20 18:09:15Z knoop
	49	! Forced header and separation lines into 80 columns
	50	!
[1995]	51	! 1994 2016-08-15 09:52:21Z suehring
	52	! Bugfix in definition of generic topography
	53	!
[1983]	54	! 1982 2016-08-01 11:04:48Z suehring
	55	! Bugfix concering consistency check for topography
	56	!
[1969]	57	! 1968 2016-07-18 12:01:49Z suehring
[1968]	58	! Changed: PE-wise reading of topography file in order to avoid global definition
	59	! of arrays nzb_local and nzb_tmp. Thereby, topography definition for single
	60	! buildings and street canyons has changed, as well as flag setting for
	61	! multigrid scheme.
	62	!
	63	! Bugfix in checking l_grid anisotropy.
	64	! Simplify initial computation of lwall and vertical_influence, i.e. remove
	65	! nzb_s_inner as it is still zero at this point.
[1932]	66	!
[1943]	67	! 1942 2016-06-14 12:18:18Z suehring
	68	! Topography filter implemented to fill holes resolved by only one grid point.
	69	! Initialization of flags for ws-scheme moved to advec_ws.
	70	!
[1932]	71	! 1931 2016-06-10 12:06:59Z suehring
	72	! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid
	73	!
[1911]	74	! 1910 2016-05-26 06:49:46Z raasch
	75	! Bugfix: if topography is read from file, Neumann conditions are used for the
	76	! nzb_local array (instead of cyclic conditions) in case that non-cyclic
	77	! boundary conditions are switched on for the run
	78	!
[1903]	79	! 1902 2016-05-09 11:18:56Z suehring
[1910]	80	! Set topography flags for multigrid solver only (not for multigrid_fast)
[1903]	81	!
[1887]	82	! 1886 2016-04-21 11:20:47Z suehring
	83	! Bugfix: setting advection flags near walls
	84	! reformulated index values for nzb_v_inner
	85	! variable discriptions added in declaration block
	86	!
[1846]	87	! 1845 2016-04-08 08:29:13Z raasch
	88	! nzb_2d removed
	89	!
[1805]	90	! 1804 2016-04-05 16:30:18Z maronga
	91	! Removed code for parameter file check (__check)
	92	!
[1780]	93	! 1779 2016-03-03 08:01:28Z raasch
	94	! coupling_char is trimmed at every place it occurs, because it can have
	95	! different length now
	96	!
[1763]	97	! 1762 2016-02-25 12:31:13Z hellstea
	98	! Introduction of nested domain feature
	99	!
[1744]	100	! 1743 2016-01-13 10:23:51Z raasch
	101	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	102	! total domain
	103	!
[1692]	104	! 1691 2015-10-26 16:17:44Z maronga
	105	! Renamed prandtl_layer to constant_flux_layer.
	106	!
[1683]	107	! 1682 2015-10-07 23:56:08Z knoop
	108	! Code annotations made doxygen readable
	109	!
[1678]	110	! 1677 2015-10-02 13:25:23Z boeske
	111	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	112	!
[1676]	113	! 1675 2015-10-02 08:28:59Z gronemeier
	114	! Bugfix: Definition of topography grid levels
	115	!
[1662]	116	! 1660 2015-09-21 08:15:16Z gronemeier
	117	! Bugfix: Definition of topography grid levels if vertical grid stretching
	118	! starts below the maximum topography height.
	119	!
[1581]	120	! 1580 2015-04-10 13:43:49Z suehring
	121	! Bugfix: setting flags for 5th order scheme near buildings
	122	!
[1576]	123	! 1575 2015-03-27 09:56:27Z raasch
	124	! adjustments for psolver-queries
	125	!
[1558]	126	! 1557 2015-03-05 16:43:04Z suehring
	127	! Adjustment for monotoinic limiter
	128	!
[1419]	129	! 1418 2014-06-06 13:05:08Z fricke
	130	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	131	! condition and a negative value for dz_stretch_level the condition
	132	! was always true for the whole model domain
	133	!
[1410]	134	! 1409 2014-05-23 12:11:32Z suehring
	135	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	136	! j <= nysv
	137	!
[1354]	138	! 1353 2014-04-08 15:21:23Z heinze
	139	! REAL constants provided with KIND-attribute
	140	!
[1323]	141	! 1322 2014-03-20 16:38:49Z raasch
	142	! REAL constants defined as wp-kind
	143	!
[1321]	144	! 1320 2014-03-20 08:40:49Z raasch
[1320]	145	! ONLY-attribute added to USE-statements,
	146	! kind-parameters added to all INTEGER and REAL declaration statements,
	147	! kinds are defined in new module kinds,
	148	! revision history before 2012 removed,
	149	! comment fields (!:) to be used for variable explanations added to
	150	! all variable declaration statements
[1321]	151	!
[1222]	152	! 1221 2013-09-10 08:59:13Z raasch
	153	! wall_flags_00 introduced to hold bits 32-63,
	154	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	155	! loops optimized for openACC (pres + flow_statistics)
	156	!
[1093]	157	! 1092 2013-02-02 11:24:22Z raasch
	158	! unused variables removed
	159	!
[1070]	160	! 1069 2012-11-28 16:18:43Z maronga
[1779]	161	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	162	! ocean model in case of coupled runs
[1070]	163	!
[1037]	164	! 1036 2012-10-22 13:43:42Z raasch
	165	! code put under GPL (PALM 3.9)
	166	!
[1017]	167	! 1015 2012-09-27 09:23:24Z raasch
	168	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	169	! nzb_w_inner+1
	170	!
[997]	171	! 996 2012-09-07 10:41:47Z raasch
	172	! little reformatting
	173	!
[979]	174	! 978 2012-08-09 08:28:32Z fricke
	175	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	176	! Bugfix: Set wall_flags_0 for inflow boundary
	177	!
[928]	178	! 927 2012-06-06 19:15:04Z raasch
	179	! Wall flags are not set for multigrid method in case of masking method
	180	!
[865]	181	! 864 2012-03-27 15:10:33Z gryschka
[927]	182	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	183	! were not correctly defined for k=1.
[865]	184	!
[863]	185	! 861 2012-03-26 14:18:34Z suehring
[861]	186	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	187	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	188	! model domain.!
[861]	189	! Initialization of nzb_s_inner and nzb_w_inner.
	190	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	191	! while setting wall_flags_0
	192	!
[844]	193	! 843 2012-02-29 15:16:21Z gryschka
	194	! In case of ocean and dirichlet bc for u and v at the bottom
	195	! the first u-level ist defined at same height as the first w-level
	196	!
[819]	197	! 818 2012-02-08 16:11:23Z maronga
	198	! Bugfix: topo_height is only required if topography is used. It is thus now
	199	! allocated in the topography branch
	200	!
[810]	201	! 809 2012-01-30 13:32:58Z maronga
	202	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	203	!
[808]	204	! 807 2012-01-25 11:53:51Z maronga
	205	! New cpp directive "__check" implemented which is used by check_namelist_files
	206	!
[1]	207	! Revision 1.1 1997/08/11 06:17:45 raasch
	208	! Initial revision (Testversion)
	209	!
	210	!
	211	! Description:
	212	! ------------
[1682]	213	!> Creating grid depending constants
[1]	214	!------------------------------------------------------------------------------!
[1682]	215	SUBROUTINE init_grid
	216
[1942]	217	USE advec_ws, &
	218	ONLY: ws_init_flags
[1]	219
[1320]	220	USE arrays_3d, &
	221	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	222	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	223
[1353]	224	USE control_parameters, &
[1910]	225	ONLY: bc_lr_cyc, bc_ns_cyc, building_height, building_length_x, &
[1320]	226	building_length_y, building_wall_left, building_wall_south, &
	227	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	228	canyon_width_x, canyon_width_y, constant_flux_layer, &
	229	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
[1968]	230	dz_stretch_level, dz_stretch_level_index, grid_level, ibc_uv_b, &
	231	io_blocks, io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
[1691]	232	masking_method, maximum_grid_level, message_string, &
[2021]	233	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	234	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
[1762]	235	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	236	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
[2021]	237	wall_adjustment_factor
	238
[1320]	239	USE grid_variables, &
[2037]	240	ONLY: ddx, ddx2, ddy, ddy2, dx, dx2, dy, dy2, fwxm, &
[1320]	241	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	242	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	243
	244	USE indices, &
[1942]	245	ONLY: flags, nbgp, nx, nxl, nxlg, nxl_mg, nxr, nxrg, nxr_mg, &
	246	ny, nyn, nyng, nyn_mg, nys, nys_mg, nysg, nz, nzb, &
[1845]	247	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
	248	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
	249	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
	250	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
[1320]	251	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	252	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	253	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	254	wall_flags_9
	255
	256	USE kinds
	257
[1]	258	USE pegrid
	259
	260	IMPLICIT NONE
	261
[1968]	262	INTEGER(iwp) :: bh !< temporary vertical index of building height
	263	INTEGER(iwp) :: blx !< grid point number of building size along x
	264	INTEGER(iwp) :: bly !< grid point number of building size along y
	265	INTEGER(iwp) :: bxl !< index for left building wall
	266	INTEGER(iwp) :: bxr !< index for right building wall
	267	INTEGER(iwp) :: byn !< index for north building wall
	268	INTEGER(iwp) :: bys !< index for south building wall
	269	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
	270	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
	271	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
	272	INTEGER(iwp) :: cxl !< index for left canyon wall
	273	INTEGER(iwp) :: cxr !< index for right canyon wall
	274	INTEGER(iwp) :: cyn !< index for north canyon wall
	275	INTEGER(iwp) :: cys !< index for south canyon wall
	276	INTEGER(iwp) :: i !< index variable along x
	277	INTEGER(iwp) :: ii !< loop variable for reading topography file
	278	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
	279	INTEGER(iwp) :: j !< index variable along y
	280	INTEGER(iwp) :: k !< index variable along z
	281	INTEGER(iwp) :: l !< loop variable
	282	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
	283	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
	284	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
	285	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
	286	INTEGER(iwp) :: nzb_local_max !< vertical grid index of maximum topography height
	287	INTEGER(iwp) :: nzb_local_min !< vertical grid index of minimum topography height
	288	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
	289	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
	290	INTEGER(iwp) :: num_hole !< number of holes (in topography) resolved by only one grid point
	291	INTEGER(iwp) :: num_hole_l !< number of holes (in topography) resolved by only one grid point on local PE
	292	INTEGER(iwp) :: num_wall !< number of surrounding vertical walls for a single grid point
	293	INTEGER(iwp) :: skip_n_rows !< counting variable to skip rows while reading topography file
	294	INTEGER(iwp) :: vi !< dummy for vertical influence
[1]	295
[1886]	296	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
[1931]	297	vertical_influence !< number of vertical grid points above obstacle where adjustment of near-wall mixing length is required
[1886]	298
[1968]	299	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of north-left corner location to limit near-wall mixing length
	300	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
	301	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
	302	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
	303	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography top at cell-center
	304	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate topography indices on u- and v-grid
	305	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to adjacent left-facing wall
	306	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
	307	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
	308	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
[1]	309
[1968]	310	REAL(wp) :: dum !< dummy variable to skip columns while reading topography file
[1886]	311	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
[861]	312
[1968]	313	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for topography height
	314	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zu_s_inner_l !< dummy array on global scale to write topography output array
	315	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zw_w_inner_l !< dummy array on global scale to write topography output array
[1]	316
[667]	317
[1]	318	!
[709]	319	!-- Calculation of horizontal array bounds including ghost layers
[667]	320	nxlg = nxl - nbgp
	321	nxrg = nxr + nbgp
	322	nysg = nys - nbgp
	323	nyng = nyn + nbgp
[709]	324
[667]	325	!
[1]	326	!-- Allocate grid arrays
[1353]	327	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	328	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	329
	330	!
	331	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	332	IF ( dz == -1.0_wp ) THEN
[254]	333	message_string = 'missing dz'
	334	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	335	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	336	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	337	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	338	ENDIF
[94]	339
[1]	340	!
[94]	341	!-- Define the vertical grid levels
	342	IF ( .NOT. ocean ) THEN
	343	!
	344	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	345	!-- The second u-level (k=1) corresponds to the top of the
[94]	346	!-- Prandtl-layer.
[667]	347
	348	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	349	zu(0) = 0.0_wp
	350	! zu(0) = - dz * 0.5_wp
[667]	351	ELSE
[1353]	352	zu(0) = - dz * 0.5_wp
[667]	353	ENDIF
[1353]	354	zu(1) = dz * 0.5_wp
[1]	355
[94]	356	dz_stretch_level_index = nzt+1
	357	dz_stretched = dz
	358	DO k = 2, nzt+1
	359	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	360	dz_stretched = dz_stretched * dz_stretch_factor
	361	dz_stretched = MIN( dz_stretched, dz_max )
	362	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	363	ENDIF
	364	zu(k) = zu(k-1) + dz_stretched
	365	ENDDO
[1]	366
	367	!
[94]	368	!-- Compute the w-levels. They are always staggered half-way between the
[843]	369	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	370	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	371	!-- The top w-level is extrapolated linearly.
[1353]	372	zw(0) = 0.0_wp
[94]	373	DO k = 1, nzt
[1353]	374	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	375	ENDDO
[1353]	376	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	377
[94]	378	ELSE
[1]	379	!
[843]	380	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	381	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	382	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	383	!-- w-level are defined at same height, but staggered from the second level.
	384	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	385	zu(nzt+1) = dz * 0.5_wp
	386	zu(nzt) = - dz * 0.5_wp
[94]	387
	388	dz_stretch_level_index = 0
	389	dz_stretched = dz
	390	DO k = nzt-1, 0, -1
[1418]	391	!
	392	!-- The default value of dz_stretch_level is positive, thus the first
	393	!-- condition is always true. Hence, the second condition is necessary.
	394	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	395	.AND. dz_stretched < dz_max ) THEN
[94]	396	dz_stretched = dz_stretched * dz_stretch_factor
	397	dz_stretched = MIN( dz_stretched, dz_max )
	398	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	399	ENDIF
	400	zu(k) = zu(k+1) - dz_stretched
	401	ENDDO
	402
	403	!
	404	!-- Compute the w-levels. They are always staggered half-way between the
[843]	405	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	406	!-- at the ground. In this case the first u- and w-level are defined at
	407	!-- same height. The top w-level (nzt+1) is not used but set for
	408	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	409	zw(nzt+1) = dz
[1353]	410	zw(nzt) = 0.0_wp
[94]	411	DO k = 0, nzt
[1353]	412	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	413	ENDDO
	414
[843]	415	!
	416	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	417	!-- at same height.
	418	IF ( ibc_uv_b == 0 ) THEN
	419	zu(0) = zw(0)
	420	ENDIF
	421
[94]	422	ENDIF
	423
	424	!
[1]	425	!-- Compute grid lengths.
	426	DO k = 1, nzt+1
	427	dzu(k) = zu(k) - zu(k-1)
[1353]	428	ddzu(k) = 1.0_wp / dzu(k)
[1]	429	dzw(k) = zw(k) - zw(k-1)
[1353]	430	ddzw(k) = 1.0_wp / dzw(k)
[1]	431	ENDDO
	432
	433	DO k = 1, nzt
[1353]	434	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	435	ENDDO
[667]	436
	437	!
[709]	438	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	439	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	440	!-- is only dz/2, but should be dz. Therefore, an additional array
	441	!-- containing with appropriate grid information is created for these
	442	!-- solvers.
[1575]	443	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	444	ALLOCATE( ddzu_pres(1:nzt+1) )
	445	ddzu_pres = ddzu
[864]	446	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[1]	447	ENDIF
	448
	449	!
	450	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	451	ddx = 1.0_wp / dx
	452	ddy = 1.0_wp / dy
[1]	453	dx2 = dx * dx
	454	dy2 = dy * dy
[1353]	455	ddx2 = 1.0_wp / dx2
	456	ddy2 = 1.0_wp / dy2
[1]	457
	458	!
	459	!-- Compute the grid-dependent mixing length.
	460	DO k = 1, nzt
[1322]	461	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	462	ENDDO
	463
	464	!
	465	!-- Allocate outer and inner index arrays for topography and set
[114]	466	!-- defaults.
[667]	467
[114]	468	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	469	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
	470	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1968]	471	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
	472
[667]	473	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	474	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	475	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	476	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	477	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	478	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	479	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	480	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	481	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	482	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	483	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	484	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	485	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	486	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	487	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	488	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
[1968]	489	nzb_local(nysg:nyng,nxlg:nxrg), &
	490	nzb_tmp(nysg:nyng,nxlg:nxrg), &
[1221]	491	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	492	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	493	wall_e_x(nysg:nyng,nxlg:nxrg), &
	494	wall_e_y(nysg:nyng,nxlg:nxrg), &
	495	wall_u(nysg:nyng,nxlg:nxrg), &
	496	wall_v(nysg:nyng,nxlg:nxrg), &
	497	wall_w_x(nysg:nyng,nxlg:nxrg), &
	498	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	499
	500
[667]	501
	502	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	503
[818]	504
[1]	505	nzb_s_inner = nzb; nzb_s_outer = nzb
	506	nzb_u_inner = nzb; nzb_u_outer = nzb
	507	nzb_v_inner = nzb; nzb_v_outer = nzb
	508	nzb_w_inner = nzb; nzb_w_outer = nzb
	509
[1353]	510	rflags_s_inner = 1.0_wp
	511	rflags_invers = 1.0_wp
[1221]	512
[1]	513	!
[19]	514	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	515	!-- form (which does not use surface fluxes) is applied
[1691]	516	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	517	nzb_diff = nzb + 2
	518	ELSE
	519	nzb_diff = nzb + 1
	520	ENDIF
[19]	521	IF ( use_top_fluxes ) THEN
	522	nzt_diff = nzt - 1
	523	ELSE
	524	nzt_diff = nzt
	525	ENDIF
[1]	526
	527	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	528	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	529
[1353]	530	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	531	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	532	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	533	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	534
	535	!
	536	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	537	!-- for the moment,
	538	!-- multiplication with wall_adjustment_factor near the end of this routine
	539	l_wall(nzb,:,:) = l_grid(1)
	540	DO k = nzb+1, nzt
	541	l_wall(k,:,:) = l_grid(k)
	542	ENDDO
	543	l_wall(nzt+1,:,:) = l_grid(nzt)
	544
	545	ALLOCATE ( vertical_influence(nzb:nzt) )
	546	DO k = 1, nzt
	547	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	548	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	549	ENDDO
	550
[1968]	551	DO k = 1, nzt
[1353]	552	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	553	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	554	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	555	'threshold given by only local', &
	556	' &horizontal reduction of near_wall ', &
	557	'mixing length l_wall', &
	558	' &starting from height level k = ', k, '.'
	559	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	560	EXIT
	561	ENDIF
	562	ENDDO
	563	vertical_influence(0) = vertical_influence(1)
	564
[1968]	565	DO k = nzb + 1, nzb + vertical_influence(nzb)
	566	l_wall(k,:,:) = zu(k) - zw(nzb)
[1]	567	ENDDO
	568
	569	!
	570	!-- Set outer and inner index arrays for non-flat topography.
	571	!-- Here consistency checks concerning domain size and periodicity are
	572	!-- necessary.
	573	!-- Within this SELECT CASE structure only nzb_local is initialized
	574	!-- individually depending on the chosen topography type, all other index
	575	!-- arrays are initialized further below.
	576	SELECT CASE ( TRIM( topography ) )
	577
	578	CASE ( 'flat' )
	579	!
[555]	580	!-- nzb_local is required for the multigrid solver
	581	nzb_local = 0
[1]	582
	583	CASE ( 'single_building' )
	584	!
	585	!-- Single rectangular building, by default centered in the middle of the
	586	!-- total domain
	587	blx = NINT( building_length_x / dx )
	588	bly = NINT( building_length_y / dy )
[2088]	589	IF ( .NOT. ocean ) THEN
	590	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	591	ELSE
	592	bh = MINLOC( ABS( zw - zw(0) - building_height ), 1 ) - 1
	593	ENDIF
	594
[1675]	595	IF ( ABS( zw(bh ) - building_height ) == &
	596	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	597
[1322]	598	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	599	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	600	ENDIF
	601	bxl = NINT( building_wall_left / dx )
	602	bxr = bxl + blx
	603
[1322]	604	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	605	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	606	ENDIF
	607	bys = NINT( building_wall_south / dy )
	608	byn = bys + bly
	609
	610	!
	611	!-- Building size has to meet some requirements
	612	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	613	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	614	WRITE( message_string, * ) 'inconsistent building parameters:', &
	615	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	616	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	617	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	618	ENDIF
	619
	620	!
[1968]	621	!-- Define the building.
[1]	622	nzb_local = 0
[1968]	623	IF ( bxl <= nxr .AND. bxr >= nxl .AND. &
	624	bys <= nyn .AND. byn >= nys ) &
	625	nzb_local(MAX(nys,bys):MIN(nyn,byn),MAX(nxl,bxl):MIN(nxr,bxr)) = bh
[1]	626
[1994]	627	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	628
[240]	629	CASE ( 'single_street_canyon' )
	630	!
	631	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	632	!-- The canyon is centered in the other direction by default.
[1322]	633	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	634	!
	635	!-- Street canyon in y direction
	636	cwx = NINT( canyon_width_x / dx )
[1322]	637	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	638	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	639	ENDIF
	640	cxl = NINT( canyon_wall_left / dx )
	641	cxr = cxl + cwx
	642
[1322]	643	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	644	!
	645	!-- Street canyon in x direction
	646	cwy = NINT( canyon_width_y / dy )
[1322]	647	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	648	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	649	ENDIF
	650	cys = NINT( canyon_wall_south / dy )
	651	cyn = cys + cwy
	652
	653	ELSE
[254]	654
	655	message_string = 'no street canyon width given'
	656	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	657
[240]	658	ENDIF
	659
[2088]	660	IF ( .NOT. ocean ) THEN
	661	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	662	ELSE
	663	ch = MINLOC( ABS( zw - zw(0) - canyon_height ), 1 ) - 1
	664	ENDIF
	665
[1675]	666	IF ( ABS( zw(ch ) - canyon_height ) == &
	667	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	668
[240]	669	dp_level_ind_b = ch
	670	!
	671	!-- Street canyon size has to meet some requirements
[1322]	672	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	673	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	674	( ch < 3 ) ) THEN
[1353]	675	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	676	'&cxl=', cxl, 'cxr=', cxr, &
	677	'cwx=', cwx, &
[254]	678	'ch=', ch, 'nx=', nx, 'ny=', ny
	679	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	680	ENDIF
[1322]	681	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	682	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	683	( ch < 3 ) ) THEN
[1353]	684	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	685	'&cys=', cys, 'cyn=', cyn, &
	686	'cwy=', cwy, &
[254]	687	'ch=', ch, 'nx=', nx, 'ny=', ny
	688	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	689	ENDIF
	690	ENDIF
[1353]	691	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	692	canyon_width_y /= 9999999.9_wp ) THEN
	693	message_string = 'inconsistent canyon parameters:' // &
	694	'&street canyon can only be oriented' // &
[254]	695	'&either in x- or in y-direction'
	696	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	697	ENDIF
	698
	699	nzb_local = ch
[1322]	700	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1968]	701	IF ( cxl <= nxr .AND. cxr >= nxl ) &
	702	nzb_local(:,MAX(nxl,cxl+1):MIN(nxr,cxr-1)) = 0
[1322]	703	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1968]	704	IF ( cys <= nyn .AND. cyn >= nys ) &
	705	nzb_local(MAX(nys,cys+1):MIN(nyn,cyn-1),:) = 0
[240]	706	ENDIF
	707
[1994]	708	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	709
[1]	710	CASE ( 'read_from_file' )
[759]	711
[1968]	712	ALLOCATE ( topo_height(nys:nyn,nxl:nxr) )
[818]	713
[759]	714	DO ii = 0, io_blocks-1
	715	IF ( ii == io_group ) THEN
	716
[1]	717	!
[759]	718	!-- Arbitrary irregular topography data in PALM format (exactly
	719	!-- matching the grid size and total domain size)
[1779]	720	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	721	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[1968]	722	!
	723	!-- Read topography PE-wise. Rows are read from nyn to nys, columns
	724	!-- are read from nxl to nxr. At first, ny-nyn rows need to be skipped.
	725	skip_n_rows = 0
	726	DO WHILE ( skip_n_rows < ny - nyn )
	727	READ( 90, * )
	728	skip_n_rows = skip_n_rows + 1
[759]	729	ENDDO
[1968]	730	!
	731	!-- Read data from nyn to nys and nxl to nxr. Therefore, skip
	732	!-- column until nxl-1 is reached
	733	DO j = nyn, nys, -1
	734	READ( 90, *, ERR=11, END=11 ) &
	735	( dum, i = 0, nxl-1 ), &
	736	( topo_height(j,i), i = nxl, nxr )
	737	ENDDO
[759]	738
	739	GOTO 12
	740
[1779]	741	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	742	' does not exist'
[759]	743	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	744
[1779]	745	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	746	TRIM( coupling_char )
[759]	747	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	748
	749	12 CLOSE( 90 )
	750
	751	ENDIF
[1804]	752	#if defined( __parallel )
[759]	753	CALL MPI_BARRIER( comm2d, ierr )
	754	#endif
[559]	755	ENDDO
[759]	756
[1]	757	!
	758	!-- Calculate the index height of the topography
[1968]	759	nzb_local = 0
	760	DO i = nxl, nxr
	761	DO j = nys, nyn
[2128]	762	IF ( .NOT. ocean ) THEN
	763	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	764	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	765	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	766	nzb_local(j,i) = nzb_local(j,i) + 1
	767	ELSE
	768	nzb_local(j,i) = MINLOC( ABS( zw - zw(0) &
	769	- topo_height(j,i) ), 1 ) - 1
	770	IF ( ABS( zw(nzb_local(j,i) ) - zw(0) &
	771	- topo_height(j,i) ) == &
	772	ABS( zw(nzb_local(j,i)+1) - zw(0) &
	773	- topo_height(j,i) ) ) &
	774	nzb_local(j,i) = nzb_local(j,i) + 1
	775	ENDIF
	776
[1]	777	ENDDO
	778	ENDDO
[818]	779
	780	DEALLOCATE ( topo_height )
[1942]	781	!
	782	!-- Filter topography, i.e. fill holes resolved by only one grid point.
	783	!-- Such holes are suspected to lead to velocity blow-ups as continuity
	784	!-- equation on discrete grid cannot be fulfilled in such case.
	785	!-- For now, check only for holes and fill them to the lowest height level
	786	!-- of the directly adjoining grid points along x- and y- direction.
	787	!-- Before checking for holes, set lateral boundary conditions for
	788	!-- topography. After hole-filling, boundary conditions must be set again!
[1968]	789	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	790
	791	IF ( .NOT. bc_ns_cyc ) THEN
	792	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
	793	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
[1942]	794	ENDIF
[1910]	795
[1968]	796	IF ( .NOT. bc_lr_cyc ) THEN
	797	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
	798	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
[1942]	799	ENDIF
	800
[1968]	801	num_hole_l = 0
	802	DO i = nxl, nxr
	803	DO j = nys, nyn
[1942]	804
	805	num_wall = 0
	806
	807	IF ( nzb_local(j-1,i) > nzb_local(j,i) ) &
	808	num_wall = num_wall + 1
	809	IF ( nzb_local(j+1,i) > nzb_local(j,i) ) &
	810	num_wall = num_wall + 1
	811	IF ( nzb_local(j,i-1) > nzb_local(j,i) ) &
	812	num_wall = num_wall + 1
	813	IF ( nzb_local(j,i+1) > nzb_local(j,i) ) &
	814	num_wall = num_wall + 1
	815
	816	IF ( num_wall == 4 ) THEN
	817	nzb_local(j,i) = MIN( nzb_local(j-1,i), nzb_local(j+1,i), &
	818	nzb_local(j,i-1), nzb_local(j,i+1) )
[1968]	819	num_hole_l = num_hole_l + 1
[1942]	820	ENDIF
	821	ENDDO
	822	ENDDO
[114]	823	!
[1968]	824	!-- Count the total number of holes, required for informative message.
	825	#if defined( __parallel )
	826	CALL MPI_ALLREDUCE( num_hole_l, num_hole, 1, MPI_INTEGER, MPI_SUM, &
	827	comm2d, ierr )
	828	#else
	829	num_hole = num_hole_l
	830	#endif
	831	!
[1942]	832	!-- Create an informative message if any hole was removed.
[1968]	833	IF ( num_hole > 0 ) THEN
[1942]	834	WRITE( message_string, * ) num_hole, 'hole(s) resolved by only '//&
	835	'one grid point were filled'
	836	CALL message( 'init_grid', 'PA0430', 0, 0, 0, 6, 0 )
	837	ENDIF
	838	!
[1968]	839	!-- Exchange ghost-points, as well as add cyclic or Neumann boundary
	840	!-- conditions.
	841	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	842
	843	IF ( .NOT. bc_ns_cyc ) THEN
	844	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
	845	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
[1910]	846	ENDIF
[667]	847
[1968]	848	IF ( .NOT. bc_lr_cyc ) THEN
	849	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
	850	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
[1910]	851	ENDIF
	852
[1]	853	CASE DEFAULT
	854	!
	855	!-- The DEFAULT case is reached either if the parameter topography
[217]	856	!-- contains a wrong character string or if the user has defined a special
[1]	857	!-- case in the user interface. There, the subroutine user_init_grid
	858	!-- checks which of these two conditions applies.
[1968]	859	CALL user_init_grid( nzb_local )
[1]	860
	861	END SELECT
	862	!
[861]	863	!-- Determine the maximum level of topography. Furthermore it is used for
	864	!-- steering the degradation of order of the applied advection scheme.
[978]	865	!-- In case of non-cyclic lateral boundaries, the order of the advection
[1968]	866	!-- scheme has to be reduced up to nzt (required at the lateral boundaries).
	867	#if defined( __parallel )
	868	CALL MPI_ALLREDUCE( MAXVAL( nzb_local ) + 1, nzb_max, 1, MPI_INTEGER, &
	869	MPI_MAX, comm2d, ierr )
	870	#else
[1677]	871	nzb_max = MAXVAL( nzb_local ) + 1
[1968]	872	#endif
[1353]	873	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	874	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	875	nest_domain ) &
	876	THEN
	877	nzb_max = nzt
[978]	878	ENDIF
	879
[861]	880	!
[1]	881	!-- Consistency checks and index array initialization are only required for
[217]	882	!-- non-flat topography, also the initialization of topography height arrays
[49]	883	!-- zu_s_inner and zw_w_inner
[1]	884	IF ( TRIM( topography ) /= 'flat' ) THEN
[1968]	885	#if defined( __parallel )
	886	CALL MPI_ALLREDUCE( MAXVAL( nzb_local ), nzb_local_max, 1, MPI_INTEGER, &
	887	MPI_MAX, comm2d, ierr )
[1982]	888	CALL MPI_ALLREDUCE( MINVAL( nzb_local ), nzb_local_min, 1, MPI_INTEGER, &
[1968]	889	MPI_MIN, comm2d, ierr )
	890	#else
	891	nzb_local_max = MAXVAL( nzb_local )
	892	nzb_local_min = MINVAL( nzb_local )
	893	#endif
[1982]	894
[1]	895	!
	896	!-- Consistency checks
[1968]	897	IF ( nzb_local_min < 0 .OR. nzb_local_max > nz + 1 ) THEN
[1353]	898	WRITE( message_string, * ) 'nzb_local values are outside the', &
	899	'model domain', &
[1968]	900	'&MINVAL( nzb_local ) = ', nzb_local_min, &
	901	'&MAXVAL( nzb_local ) = ', nzb_local_max
[254]	902	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	903	ENDIF
	904
[2169]	905	!
	906	!-- In case of non-flat topography, check whether the convention how to
	907	!-- define the topography grid has been set correctly, or whether the default
	908	!-- is applicable. If this is not possible, abort.
	909	IF ( TRIM( topography_grid_convention ) == ' ' ) THEN
	910	IF ( TRIM( topography ) /= 'single_building' .AND. &
	911	TRIM( topography ) /= 'single_street_canyon' .AND. &
	912	TRIM( topography ) /= 'read_from_file' ) THEN
	913	!-- The default value is not applicable here, because it is only valid
	914	!-- for the two standard cases 'single_building' and 'read_from_file'
	915	!-- defined in init_grid.
	916	WRITE( message_string, * ) &
	917	'The value for "topography_grid_convention" ', &
	918	'is not set. Its default value is & only valid for ', &
	919	'"topography" = ''single_building'', ', &
	920	'''single_street_canyon'' & or ''read_from_file''.', &
	921	' & Choose ''cell_edge'' or ''cell_center''.'
	922	CALL message( 'init_grid', 'PA0239', 1, 2, 0, 6, 0 )
	923	ELSE
	924	!-- The default value is applicable here.
	925	!-- Set convention according to topography.
	926	IF ( TRIM( topography ) == 'single_building' .OR. &
	927	TRIM( topography ) == 'single_street_canyon' ) THEN
	928	topography_grid_convention = 'cell_edge'
	929	ELSEIF ( TRIM( topography ) == 'read_from_file' ) THEN
	930	topography_grid_convention = 'cell_center'
	931	ENDIF
	932	ENDIF
	933	ELSEIF ( TRIM( topography_grid_convention ) /= 'cell_edge' .AND. &
	934	TRIM( topography_grid_convention ) /= 'cell_center' ) THEN
	935	WRITE( message_string, * ) &
	936	'The value for "topography_grid_convention" is ', &
	937	'not recognized. & Choose ''cell_edge'' or ''cell_center''.'
	938	CALL message( 'init_grid', 'PA0240', 1, 2, 0, 6, 0 )
	939	ENDIF
	940
[217]	941	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	942	!
[217]	943	!-- The array nzb_local as defined using the 'cell_edge' convention
	944	!-- describes the actual total size of topography which is defined at the
	945	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	946	!-- on the topography walls in y-direction. However, PALM uses individual
	947	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	948	!-- Therefore, the extent of topography in nzb_local is now reduced by
	949	!-- 1dx at the E topography walls and by 1dy at the N topography walls
[1968]	950	!-- to form the basis for nzb_s_inner.
	951	!-- Note, the reverse memory access (i-j instead of j-i) is absolutely
	952	!-- required at this point.
	953	DO j = nys+1, nyn+1
	954	DO i = nxl-1, nxr
[217]	955	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	956	ENDDO
[134]	957	ENDDO
[1968]	958	!
	959	!-- Exchange ghost points
	960	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	961
	962	DO i = nxl, nxr+1
	963	DO j = nys-1, nyn
[217]	964	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	965	ENDDO
[134]	966	ENDDO
[1968]	967	!
	968	!-- Exchange ghost points
	969	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
[217]	970	ENDIF
[1]	971	!
	972	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[1968]	973	nzb_s_inner = nzb_local
	974	nzb_w_inner = nzb_local
[1]	975
	976	!
	977	!-- Initialize remaining index arrays:
	978	!-- first pre-initialize them with nzb_s_inner...
	979	nzb_u_inner = nzb_s_inner
	980	nzb_u_outer = nzb_s_inner
	981	nzb_v_inner = nzb_s_inner
	982	nzb_v_outer = nzb_s_inner
	983	nzb_w_outer = nzb_s_inner
	984	nzb_s_outer = nzb_s_inner
	985
	986	!
	987	!-- ...then extend pre-initialized arrays in their according directions
	988	!-- based on nzb_local using nzb_tmp as a temporary global index array
	989
	990	!
	991	!-- nzb_s_outer:
	992	!-- extend nzb_local east-/westwards first, then north-/southwards
[1968]	993	nzb_tmp = nzb_local
	994	DO j = nys, nyn
	995	DO i = nxl, nxr
[1353]	996	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	997	nzb_local(j,i+1) )
	998	ENDDO
	999	ENDDO
[1968]	1000
	1001	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	1002
[1]	1003	DO i = nxl, nxr
	1004	DO j = nys, nyn
[1353]	1005	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	1006	nzb_tmp(j+1,i) )
	1007	ENDDO
	1008	!
	1009	!-- non-cyclic boundary conditions (overwritten by call of
	1010	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1011	IF ( nys == 0 ) THEN
	1012	j = -1
	1013	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	1014	ENDIF
[1743]	1015	IF ( nyn == ny ) THEN
[1]	1016	j = ny + 1
	1017	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	1018	ENDIF
	1019	ENDDO
	1020	!
	1021	!-- nzb_w_outer:
	1022	!-- identical to nzb_s_outer
	1023	nzb_w_outer = nzb_s_outer
	1024
	1025	!
	1026	!-- nzb_u_inner:
	1027	!-- extend nzb_local rightwards only
[1968]	1028	nzb_tmp = nzb_local
	1029	DO j = nys, nyn
	1030	DO i = nxl, nxr
[1]	1031	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	1032	ENDDO
	1033	ENDDO
[1968]	1034
	1035	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	1036
	1037	nzb_u_inner = nzb_tmp
[1]	1038	!
	1039	!-- nzb_u_outer:
	1040	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	1041	DO i = nxl, nxr
	1042	DO j = nys, nyn
[1353]	1043	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	1044	nzb_tmp(j+1,i) )
	1045	ENDDO
	1046	!
	1047	!-- non-cyclic boundary conditions (overwritten by call of
	1048	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1049	IF ( nys == 0 ) THEN
	1050	j = -1
	1051	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	1052	ENDIF
[1743]	1053	IF ( nyn == ny ) THEN
[1]	1054	j = ny + 1
	1055	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	1056	ENDIF
	1057	ENDDO
	1058
	1059	!
	1060	!-- nzb_v_inner:
	1061	!-- extend nzb_local northwards only
[1968]	1062	nzb_tmp = nzb_local
	1063	DO i = nxl, nxr
	1064	DO j = nys, nyn
[1]	1065	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	1066	ENDDO
	1067	ENDDO
[1968]	1068
	1069	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	1070	nzb_v_inner = nzb_tmp
[1]	1071
	1072	!
	1073	!-- nzb_v_outer:
	1074	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	1075	DO j = nys, nyn
	1076	DO i = nxl, nxr
[1353]	1077	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	1078	nzb_tmp(j,i+1) )
	1079	ENDDO
	1080	!
	1081	!-- non-cyclic boundary conditions (overwritten by call of
	1082	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1083	IF ( nxl == 0 ) THEN
	1084	i = -1
	1085	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	1086	ENDIF
	1087	IF ( nxr == nx ) THEN
	1088	i = nx + 1
	1089	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	1090	ENDIF
	1091	ENDDO
[1804]	1092
[1]	1093	!
	1094	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	1095	!-- boundary conditions, if applicable.
	1096	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	1097	!-- they do not require exchange and are not included here.
[1968]	1098	CALL exchange_horiz_2d_int( nzb_u_inner, nys, nyn, nxl, nxr, nbgp )
	1099	CALL exchange_horiz_2d_int( nzb_u_outer, nys, nyn, nxl, nxr, nbgp )
	1100	CALL exchange_horiz_2d_int( nzb_v_inner, nys, nyn, nxl, nxr, nbgp )
	1101	CALL exchange_horiz_2d_int( nzb_v_outer, nys, nyn, nxl, nxr, nbgp )
	1102	CALL exchange_horiz_2d_int( nzb_w_outer, nys, nyn, nxl, nxr, nbgp )
	1103	CALL exchange_horiz_2d_int( nzb_s_outer, nys, nyn, nxl, nxr, nbgp )
[1]	1104
[49]	1105	!
	1106	!-- Allocate and set the arrays containing the topography height
[1968]	1107	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1), &
	1108	zu_s_inner_l(0:nx+1,0:ny+1), zw_w_inner_l(0:nx+1,0:ny+1) )
	1109
	1110	zu_s_inner = 0.0_wp
	1111	zw_w_inner = 0.0_wp
	1112	zu_s_inner_l = 0.0_wp
	1113	zw_w_inner_l = 0.0_wp
	1114
	1115	DO i = nxl, nxr
	1116	DO j = nys, nyn
	1117	zu_s_inner_l(i,j) = zu(nzb_local(j,i))
	1118	zw_w_inner_l(i,j) = zw(nzb_local(j,i))
	1119	ENDDO
	1120	ENDDO
	1121
	1122	#if defined( __parallel )
	1123	CALL MPI_REDUCE( zu_s_inner_l, zu_s_inner, (nx+2)*(ny+2), &
	1124	MPI_REAL, MPI_SUM, 0, comm2d, ierr )
	1125	CALL MPI_REDUCE( zw_w_inner_l, zw_w_inner, (nx+2)*(ny+2), &
	1126	MPI_REAL, MPI_SUM, 0, comm2d, ierr )
	1127	#else
	1128	zu_s_inner = zu_s_inner_l
	1129	zw_w_inner = zw_w_inner_l
	1130	#endif
[49]	1131
[1968]	1132	DEALLOCATE( zu_s_inner_l, zw_w_inner_l )
	1133	IF ( myid /= 0 ) DEALLOCATE( zu_s_inner, zw_w_inner )
[1221]	1134	!
[1968]	1135	!-- Set south and left ghost points, required for netcdf output
	1136	IF ( myid == 0 ) THEN
	1137	IF( bc_lr_cyc ) THEN
	1138	zu_s_inner(nx+1,:) = zu_s_inner(0,:)
	1139	zw_w_inner(nx+1,:) = zw_w_inner(0,:)
	1140	ELSE
	1141	zu_s_inner(nx+1,:) = zu_s_inner(nx,:)
	1142	zw_w_inner(nx+1,:) = zw_w_inner(nx,:)
	1143	ENDIF
	1144	IF( bc_ns_cyc ) THEN
	1145	zu_s_inner(:,ny+1) = zu_s_inner(:,0)
	1146	zw_w_inner(:,ny+1) = zw_w_inner(:,0)
	1147	ELSE
	1148	zu_s_inner(:,ny+1) = zu_s_inner(:,ny)
	1149	zw_w_inner(:,ny+1) = zw_w_inner(:,ny)
	1150	ENDIF
	1151	ENDIF
	1152	!
[1221]	1153	!-- Set flag arrays to be used for masking of grid points
	1154	DO i = nxlg, nxrg
	1155	DO j = nysg, nyng
	1156	DO k = nzb, nzt+1
[1353]	1157	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	1158	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	1159	ENDDO
	1160	ENDDO
	1161	ENDDO
[1804]	1162
[1]	1163	ENDIF
[1968]	1164	!
	1165	!-- Deallocate temporary array, as it might be reused for different
	1166	!-- grid-levels further below.
	1167	DEALLOCATE( nzb_tmp )
[1]	1168
	1169	!
	1170	!-- Set the individual index arrays which define the k index from which on
	1171	!-- the usual finite difference form (which does not use surface fluxes) is
	1172	!-- applied
[1691]	1173	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	1174	nzb_diff_u = nzb_u_inner + 2
	1175	nzb_diff_v = nzb_v_inner + 2
	1176	nzb_diff_s_inner = nzb_s_inner + 2
	1177	nzb_diff_s_outer = nzb_s_outer + 2
	1178	ELSE
	1179	nzb_diff_u = nzb_u_inner + 1
	1180	nzb_diff_v = nzb_v_inner + 1
	1181	nzb_diff_s_inner = nzb_s_inner + 1
	1182	nzb_diff_s_outer = nzb_s_outer + 1
	1183	ENDIF
	1184
	1185	!
	1186	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	1187	!-- for limitation of near-wall mixing length l_wall further below
	1188	corner_nl = 0
	1189	corner_nr = 0
	1190	corner_sl = 0
	1191	corner_sr = 0
	1192	wall_l = 0
	1193	wall_n = 0
	1194	wall_r = 0
	1195	wall_s = 0
	1196
	1197	DO i = nxl, nxr
	1198	DO j = nys, nyn
	1199	!
	1200	!-- u-component
	1201	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1202	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1203	fym(j,i) = 0.0_wp
	1204	fyp(j,i) = 1.0_wp
[1]	1205	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1206	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1207	fym(j,i) = 1.0_wp
	1208	fyp(j,i) = 0.0_wp
[1]	1209	ENDIF
	1210	!
	1211	!-- v-component
	1212	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1213	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1214	fxm(j,i) = 0.0_wp
	1215	fxp(j,i) = 1.0_wp
[1]	1216	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1217	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1218	fxm(j,i) = 1.0_wp
	1219	fxp(j,i) = 0.0_wp
[1]	1220	ENDIF
	1221	!
	1222	!-- w-component, also used for scalars, separate arrays for shear
	1223	!-- production of tke
	1224	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1225	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1226	wall_w_y(j,i) = 1.0_wp
	1227	fwym(j,i) = 0.0_wp
	1228	fwyp(j,i) = 1.0_wp
[1]	1229	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1230	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1231	wall_w_y(j,i) = 1.0_wp
	1232	fwym(j,i) = 1.0_wp
	1233	fwyp(j,i) = 0.0_wp
[1]	1234	ENDIF
	1235	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1236	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1237	wall_w_x(j,i) = 1.0_wp
	1238	fwxm(j,i) = 0.0_wp
	1239	fwxp(j,i) = 1.0_wp
[1]	1240	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1241	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1242	wall_w_x(j,i) = 1.0_wp
	1243	fwxm(j,i) = 1.0_wp
	1244	fwxp(j,i) = 0.0_wp
[1]	1245	ENDIF
	1246	!
	1247	!-- Wall and corner locations inside buildings for limitation of
	1248	!-- near-wall mixing length l_wall
	1249	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1250
	1251	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1252
	1253	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1254	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1255	nzb_s_inner(j,i-1) ) + 1
	1256	ENDIF
	1257
	1258	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1259	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1260	nzb_s_inner(j,i+1) ) + 1
	1261	ENDIF
	1262
	1263	ENDIF
	1264
	1265	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1266
	1267	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1268	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1269	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1270	nzb_s_inner(j,i-1) ) + 1
	1271	ENDIF
	1272
	1273	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1274	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1275	nzb_s_inner(j,i+1) ) + 1
	1276	ENDIF
	1277
	1278	ENDIF
	1279
	1280	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1281	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1282	ENDIF
	1283
	1284	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1285	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1286	ENDIF
	1287
	1288	ENDDO
	1289	ENDDO
	1290	!
[1931]	1291	!-- Calculate wall flag arrays for the multigrid method.
	1292	!-- Please note, wall flags are only applied in the not cache-optimized
	1293	!-- version.
	1294	IF ( psolver == 'multigrid_noopt' ) THEN
[1968]	1295
[114]	1296	!
[1968]	1297	!-- Gridpoint increment of the current level.
[114]	1298	inc = 1
	1299	DO l = maximum_grid_level, 1 , -1
[1968]	1300	!
	1301	!-- Set grid_level as it is required for exchange_horiz_2d_int
	1302	grid_level = l
[114]	1303
	1304	nxl_l = nxl_mg(l)
	1305	nxr_l = nxr_mg(l)
	1306	nys_l = nys_mg(l)
	1307	nyn_l = nyn_mg(l)
	1308	nzt_l = nzt_mg(l)
	1309	!
	1310	!-- Assign the flag level to be calculated
	1311	SELECT CASE ( l )
	1312	CASE ( 1 )
	1313	flags => wall_flags_1
	1314	CASE ( 2 )
	1315	flags => wall_flags_2
	1316	CASE ( 3 )
	1317	flags => wall_flags_3
	1318	CASE ( 4 )
	1319	flags => wall_flags_4
	1320	CASE ( 5 )
	1321	flags => wall_flags_5
	1322	CASE ( 6 )
	1323	flags => wall_flags_6
	1324	CASE ( 7 )
	1325	flags => wall_flags_7
	1326	CASE ( 8 )
	1327	flags => wall_flags_8
	1328	CASE ( 9 )
	1329	flags => wall_flags_9
	1330	CASE ( 10 )
	1331	flags => wall_flags_10
	1332	END SELECT
	1333
	1334	!
	1335	!-- Depending on the grid level, set the respective bits in case of
	1336	!-- neighbouring walls
	1337	!-- Bit 0: wall to the bottom
	1338	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1339	!-- Bit 2: wall to the south
	1340	!-- Bit 3: wall to the north
	1341	!-- Bit 4: wall to the left
	1342	!-- Bit 5: wall to the right
[116]	1343	!-- Bit 6: inside building
[114]	1344
	1345	flags = 0
	1346
[927]	1347	!
	1348	!-- In case of masking method, flags are not set and multigrid method
	1349	!-- works like FFT-solver
[1931]	1350	IF ( .NOT. masking_method ) THEN
[927]	1351
[1968]	1352	!
	1353	!-- Allocate temporary array for topography heights on coarser grid
	1354	!-- level. Please note, 2 ghoist points are required, in order to
	1355	!-- calculate flags() on the interior ghost point.
	1356	ALLOCATE( nzb_tmp(nys_l-2:nyn_l+2,nxl_l-2:nxr_l+2) )
	1357	nzb_tmp = 0
	1358
	1359	DO i = nxl_l, nxr_l
	1360	DO j = nys_l, nyn_l
	1361	nzb_tmp(j,i) = nzb_local(jinc,iinc)
	1362	ENDDO
	1363	ENDDO
	1364	!
	1365	!-- Exchange ghost points on respective multigrid level. 2 ghost points
	1366	!-- are required, in order to calculate flags on
	1367	!-- nys_l-1 / nyn_l+1 / nxl_l-1 / nxr_l+1. The alternative would be to
	1368	!-- exchange 3D-INTEGER array flags on the respective multigrid level.
	1369	CALL exchange_horiz_2d_int( nzb_tmp, nys_l, nyn_l, nxl_l, nxr_l, 2 )
	1370	!
	1371	!-- Set non-cyclic boundary conditions on respective multigrid level
	1372	IF ( .NOT. bc_ns_cyc ) THEN
[2021]	1373	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1968]	1374	nzb_tmp(-2,:) = nzb_tmp(0,:)
	1375	nzb_tmp(-1,:) = nzb_tmp(0,:)
	1376	ENDIF
[2021]	1377	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
	1378	nzb_tmp(nyn_l+2,:) = nzb_tmp(nyn_l,:)
	1379	nzb_tmp(nyn_l+1,:) = nzb_tmp(nyn_l,:)
[1968]	1380	ENDIF
	1381	ENDIF
	1382	IF ( .NOT. bc_lr_cyc ) THEN
[2021]	1383	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1968]	1384	nzb_tmp(:,-2) = nzb_tmp(:,0)
	1385	nzb_tmp(:,-1) = nzb_tmp(:,0)
	1386	ENDIF
[2021]	1387	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
	1388	nzb_tmp(:,nxr_l+1) = nzb_tmp(:,nxr_l)
	1389	nzb_tmp(:,nxr_l+2) = nzb_tmp(:,nxr_l)
[1968]	1390	ENDIF
	1391	ENDIF
	1392
[927]	1393	DO i = nxl_l-1, nxr_l+1
	1394	DO j = nys_l-1, nyn_l+1
[1968]	1395	DO k = nzb, nzt_l+1
[114]	1396	!
[927]	1397	!-- Inside/outside building (inside building does not need
	1398	!-- further tests for walls)
[1968]	1399	IF ( k*inc <= nzb_tmp(j,i) ) THEN
[114]	1400
[927]	1401	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1402
[927]	1403	ELSE
[114]	1404	!
[927]	1405	!-- Bottom wall
[1968]	1406	IF ( (k-1)*inc <= nzb_tmp(j,i) ) THEN
[927]	1407	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1408	ENDIF
[114]	1409	!
[927]	1410	!-- South wall
[1968]	1411	IF ( k*inc <= nzb_tmp(j-1,i) ) THEN
[927]	1412	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1413	ENDIF
[114]	1414	!
[927]	1415	!-- North wall
[1968]	1416	IF ( k*inc <= nzb_tmp(j+1,i) ) THEN
[927]	1417	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1418	ENDIF
[114]	1419	!
[927]	1420	!-- Left wall
[1968]	1421	IF ( k*inc <= nzb_tmp(j,i-1) ) THEN
[927]	1422	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1423	ENDIF
[114]	1424	!
[927]	1425	!-- Right wall
[1968]	1426	IF ( k*inc <= nzb_tmp(j,i+1) ) THEN
[927]	1427	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1428	ENDIF
	1429
[114]	1430	ENDIF
	1431
[927]	1432	ENDDO
[114]	1433	ENDDO
	1434	ENDDO
	1435
[1968]	1436	DEALLOCATE( nzb_tmp )
	1437
[927]	1438	ENDIF
	1439
[114]	1440	inc = inc * 2
	1441
	1442	ENDDO
[1968]	1443	!
	1444	!-- Reset grid_level to "normal" grid
	1445	grid_level = 0
	1446
[114]	1447	ENDIF
[861]	1448	!
[1942]	1449	!-- Allocate flags needed for masking walls. Even though these flags are only
[2021]	1450	!-- required in the ws-scheme, the arrays need to be allocated here as they are
[1942]	1451	!-- used in OpenACC directives.
[1677]	1452	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1453	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1454	wall_flags_0 = 0
	1455	wall_flags_00 = 0
[114]	1456	!
[2021]	1457	!-- Init flags for ws-scheme to degrade order of the numerics near walls, i.e.
	1458	!-- to decrease the numerical stencil appropriately.
[2200]	1459	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1460	) THEN
[1942]	1461	CALL ws_init_flags
[861]	1462	ENDIF
	1463
	1464	!
[1]	1465	!-- In case of topography: limit near-wall mixing length l_wall further:
	1466	!-- Go through all points of the subdomain one by one and look for the closest
	1467	!-- surface
	1468	IF ( TRIM(topography) /= 'flat' ) THEN
	1469	DO i = nxl, nxr
	1470	DO j = nys, nyn
	1471
	1472	nzb_si = nzb_s_inner(j,i)
	1473	vi = vertical_influence(nzb_si)
	1474
	1475	IF ( wall_n(j,i) > 0 ) THEN
	1476	!
	1477	!-- North wall (y distance)
	1478	DO k = wall_n(j,i), nzb_si
[1353]	1479	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1480	ENDDO
	1481	!
	1482	!-- Above North wall (yz distance)
	1483	DO k = nzb_si + 1, nzb_si + vi
[1353]	1484	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1485	SQRT( 0.25_wp * dy**2 + &
[1]	1486	( zu(k) - zw(nzb_si) )**2 ) )
	1487	ENDDO
	1488	!
	1489	!-- Northleft corner (xy distance)
	1490	IF ( corner_nl(j,i) > 0 ) THEN
	1491	DO k = corner_nl(j,i), nzb_si
	1492	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1493	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1494	ENDDO
	1495	!
	1496	!-- Above Northleft corner (xyz distance)
	1497	DO k = nzb_si + 1, nzb_si + vi
[1353]	1498	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1499	SQRT( 0.25_wp * (dx2 + dy2) + &
	1500	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1501	ENDDO
	1502	ENDIF
	1503	!
	1504	!-- Northright corner (xy distance)
	1505	IF ( corner_nr(j,i) > 0 ) THEN
	1506	DO k = corner_nr(j,i), nzb_si
[1353]	1507	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1508	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1509	ENDDO
	1510	!
	1511	!-- Above northright corner (xyz distance)
	1512	DO k = nzb_si + 1, nzb_si + vi
[1353]	1513	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1514	SQRT( 0.25_wp * (dx2 + dy2) + &
	1515	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1516	ENDDO
	1517	ENDIF
	1518	ENDIF
	1519
	1520	IF ( wall_s(j,i) > 0 ) THEN
	1521	!
	1522	!-- South wall (y distance)
	1523	DO k = wall_s(j,i), nzb_si
[1353]	1524	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1525	ENDDO
	1526	!
	1527	!-- Above south wall (yz distance)
[1353]	1528	DO k = nzb_si + 1, nzb_si + vi
	1529	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1530	SQRT( 0.25_wp * dy**2 + &
[1]	1531	( zu(k) - zw(nzb_si) )**2 ) )
	1532	ENDDO
	1533	!
	1534	!-- Southleft corner (xy distance)
	1535	IF ( corner_sl(j,i) > 0 ) THEN
	1536	DO k = corner_sl(j,i), nzb_si
[1353]	1537	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1538	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1539	ENDDO
	1540	!
	1541	!-- Above southleft corner (xyz distance)
	1542	DO k = nzb_si + 1, nzb_si + vi
[1353]	1543	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1544	SQRT( 0.25_wp * (dx2 + dy2) + &
	1545	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1546	ENDDO
	1547	ENDIF
	1548	!
	1549	!-- Southright corner (xy distance)
	1550	IF ( corner_sr(j,i) > 0 ) THEN
	1551	DO k = corner_sr(j,i), nzb_si
[1353]	1552	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1553	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1554	ENDDO
	1555	!
	1556	!-- Above southright corner (xyz distance)
	1557	DO k = nzb_si + 1, nzb_si + vi
[1353]	1558	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1559	SQRT( 0.25_wp * (dx2 + dy2) + &
	1560	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1561	ENDDO
	1562	ENDIF
	1563
	1564	ENDIF
	1565
	1566	IF ( wall_l(j,i) > 0 ) THEN
	1567	!
	1568	!-- Left wall (x distance)
	1569	DO k = wall_l(j,i), nzb_si
[1353]	1570	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1571	ENDDO
	1572	!
	1573	!-- Above left wall (xz distance)
	1574	DO k = nzb_si + 1, nzb_si + vi
[1353]	1575	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1576	SQRT( 0.25_wp * dx**2 + &
	1577	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1578	ENDDO
	1579	ENDIF
	1580
	1581	IF ( wall_r(j,i) > 0 ) THEN
	1582	!
	1583	!-- Right wall (x distance)
	1584	DO k = wall_r(j,i), nzb_si
[1353]	1585	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1586	ENDDO
	1587	!
	1588	!-- Above right wall (xz distance)
	1589	DO k = nzb_si + 1, nzb_si + vi
[1353]	1590	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1591	SQRT( 0.25_wp * dx**2 + &
[1]	1592	( zu(k) - zw(nzb_si) )**2 ) )
	1593	ENDDO
	1594
	1595	ENDIF
	1596
	1597	ENDDO
	1598	ENDDO
	1599
	1600	ENDIF
	1601
	1602	!
	1603	!-- Multiplication with wall_adjustment_factor
	1604	l_wall = wall_adjustment_factor * l_wall
	1605
	1606	!
[709]	1607	!-- Set lateral boundary conditions for l_wall
[667]	1608	CALL exchange_horiz( l_wall, nbgp )
	1609
[1]	1610	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
[1968]	1611	vertical_influence, wall_l, wall_n, wall_r, wall_s )
[1]	1612
	1613
	1614	END SUBROUTINE init_grid

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