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source: palm/trunk/SOURCE/boundary_conds.f90 @ 1935

Last change on this file since 1935 was 1933, checked in by hellstea, 8 years ago
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[1682]	1	!> @file boundary_conds.f90
[1036]	2	!--------------------------------------------------------------------------------!
	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1818]	16	! Copyright 1997-2016 Leibniz Universitaet Hannover
[1036]	17	!--------------------------------------------------------------------------------!
	18	!
[484]	19	! Current revisions:
[1]	20	! -----------------
[1933]	21	!
	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: boundary_conds.f90 1933 2016-06-13 07:12:51Z hellstea $
	26	!
[1933]	27	! 1823 2016-04-07 08:57:52Z hoffmann
	28	! Initial version of purely vertical nesting introduced.
	29	!
[1823]	30	! 1822 2016-04-07 07:49:42Z hoffmann
	31	! icloud_scheme removed. microphyisics_seifert added.
	32	!
[1765]	33	! 1764 2016-02-28 12:45:19Z raasch
	34	! index bug for u_p at left outflow removed
	35	!
[1763]	36	! 1762 2016-02-25 12:31:13Z hellstea
	37	! Introduction of nested domain feature
	38	!
[1744]	39	! 1742 2016-01-13 09:50:06Z raasch
	40	! bugfix for outflow Neumann boundary conditions at bottom and top
	41	!
[1718]	42	! 1717 2015-11-11 15:09:47Z raasch
	43	! Bugfix: index error in outflow conditions for left boundary
	44	!
[1683]	45	! 1682 2015-10-07 23:56:08Z knoop
	46	! Code annotations made doxygen readable
	47	!
[1717]	48	! 1410 2014-05-23 12:16:18Z suehring
[1463]	49	! Bugfix: set dirichlet boundary condition for passive_scalar at model domain
	50	! top
	51	!
[1410]	52	! 1399 2014-05-07 11:16:25Z heinze
	53	! Bugfix: set inflow boundary conditions also if no humidity or passive_scalar
	54	! is used.
	55	!
[1399]	56	! 1398 2014-05-07 11:15:00Z heinze
	57	! Dirichlet-condition at the top for u and v changed to u_init and v_init also
	58	! for large_scale_forcing
	59	!
[1381]	60	! 1380 2014-04-28 12:40:45Z heinze
	61	! Adjust Dirichlet-condition at the top for pt in case of nudging
	62	!
[1362]	63	! 1361 2014-04-16 15:17:48Z hoffmann
	64	! Bottom and top boundary conditions of rain water content (qr) and
	65	! rain drop concentration (nr) changed to Dirichlet
	66	!
[1354]	67	! 1353 2014-04-08 15:21:23Z heinze
	68	! REAL constants provided with KIND-attribute
	69	!
[1321]	70	! 1320 2014-03-20 08:40:49Z raasch
[1320]	71	! ONLY-attribute added to USE-statements,
	72	! kind-parameters added to all INTEGER and REAL declaration statements,
	73	! kinds are defined in new module kinds,
	74	! revision history before 2012 removed,
	75	! comment fields (!:) to be used for variable explanations added to
	76	! all variable declaration statements
[1160]	77	!
[1258]	78	! 1257 2013-11-08 15:18:40Z raasch
	79	! loop independent clauses added
	80	!
[1242]	81	! 1241 2013-10-30 11:36:58Z heinze
	82	! Adjust ug and vg at each timestep in case of large_scale_forcing
	83	!
[1160]	84	! 1159 2013-05-21 11:58:22Z fricke
[1159]	85	! Bugfix: Neumann boundary conditions for the velocity components at the
	86	! outflow are in fact radiation boundary conditions using the maximum phase
	87	! velocity that ensures numerical stability (CFL-condition).
	88	! Hence, logical operator use_cmax is now used instead of bc_lr_dirneu/_neudir.
	89	! Bugfix: In case of use_cmax at the outflow, u, v, w are replaced by
	90	! u_p, v_p, w_p
[1116]	91	!
	92	! 1115 2013-03-26 18:16:16Z hoffmann
	93	! boundary conditions of two-moment cloud scheme are restricted to Neumann-
	94	! boundary-conditions
	95	!
[1114]	96	! 1113 2013-03-10 02:48:14Z raasch
	97	! GPU-porting
	98	! dummy argument "range" removed
	99	! Bugfix: wrong index in loops of radiation boundary condition
[1113]	100	!
[1054]	101	! 1053 2012-11-13 17:11:03Z hoffmann
	102	! boundary conditions for the two new prognostic equations (nr, qr) of the
	103	! two-moment cloud scheme
	104	!
[1037]	105	! 1036 2012-10-22 13:43:42Z raasch
	106	! code put under GPL (PALM 3.9)
	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	! Neumann boudnary conditions are added at the inflow boundary for the SGS-TKE.
	113	! Outflow boundary conditions for the velocity components can be set to Neumann
	114	! conditions or to radiation conditions with a horizontal averaged phase
	115	! velocity.
	116	!
[876]	117	! 875 2012-04-02 15:35:15Z gryschka
	118	! Bugfix in case of dirichlet inflow bc at the right or north boundary
	119	!
[1]	120	! Revision 1.1 1997/09/12 06:21:34 raasch
	121	! Initial revision
	122	!
	123	!
	124	! Description:
	125	! ------------
[1682]	126	!> Boundary conditions for the prognostic quantities.
	127	!> One additional bottom boundary condition is applied for the TKE (=(u)*2)
	128	!> in prandtl_fluxes. The cyclic lateral boundary conditions are implicitly
	129	!> handled in routine exchange_horiz. Pressure boundary conditions are
	130	!> explicitly set in routines pres, poisfft, poismg and sor.
[1]	131	!------------------------------------------------------------------------------!
[1682]	132	SUBROUTINE boundary_conds
	133
[1]	134
[1320]	135	USE arrays_3d, &
	136	ONLY: c_u, c_u_m, c_u_m_l, c_v, c_v_m, c_v_m_l, c_w, c_w_m, c_w_m_l, &
	137	dzu, e_p, nr_p, pt, pt_p, q, q_p, qr_p, sa, sa_p, &
	138	u, ug, u_init, u_m_l, u_m_n, u_m_r, u_m_s, u_p, &
	139	v, vg, v_init, v_m_l, v_m_n, v_m_r, v_m_s, v_p, &
[1380]	140	w, w_p, w_m_l, w_m_n, w_m_r, w_m_s,&
	141	pt_init
[1320]	142
	143	USE control_parameters, &
	144	ONLY: bc_pt_t_val, bc_q_t_val, constant_diffusion, &
	145	cloud_physics, dt_3d, humidity, &
[1462]	146	ibc_pt_b, ibc_pt_t, ibc_q_b, ibc_q_t, ibc_sa_t, ibc_uv_b, &
[1822]	147	ibc_uv_t, inflow_l, inflow_n, inflow_r, inflow_s, &
	148	intermediate_timestep_count, large_scale_forcing, &
	149	microphysics_seifert, nest_domain, nest_bound_l, nest_bound_s, &
	150	nudging, ocean, outflow_l, outflow_n, outflow_r, outflow_s, &
	151	passive_scalar, tsc, use_cmax
[1320]	152
	153	USE grid_variables, &
	154	ONLY: ddx, ddy, dx, dy
	155
	156	USE indices, &
	157	ONLY: nx, nxl, nxlg, nxr, nxrg, ny, nyn, nyng, nys, nysg, &
	158	nzb, nzb_s_inner, nzb_w_inner, nzt
	159
	160	USE kinds
	161
[1]	162	USE pegrid
	163
[1933]	164	USE pmc_interface, &
	165	ONLY : nesting_mode
[1320]	166
[1933]	167
[1]	168	IMPLICIT NONE
	169
[1682]	170	INTEGER(iwp) :: i !<
	171	INTEGER(iwp) :: j !<
	172	INTEGER(iwp) :: k !<
[1]	173
[1682]	174	REAL(wp) :: c_max !<
	175	REAL(wp) :: denom !<
[1]	176
[73]	177
[1]	178	!
[1113]	179	!-- Bottom boundary
	180	IF ( ibc_uv_b == 1 ) THEN
	181	!$acc kernels present( u_p, v_p )
	182	u_p(nzb,:,:) = u_p(nzb+1,:,:)
	183	v_p(nzb,:,:) = v_p(nzb+1,:,:)
	184	!$acc end kernels
	185	ENDIF
	186
	187	!$acc kernels present( nzb_w_inner, w_p )
	188	DO i = nxlg, nxrg
	189	DO j = nysg, nyng
[1353]	190	w_p(nzb_w_inner(j,i),j,i) = 0.0_wp
[1113]	191	ENDDO
	192	ENDDO
	193	!$acc end kernels
	194
	195	!
[1762]	196	!-- Top boundary. A nested domain ( ibc_uv_t = 3 ) does not require settings.
[1113]	197	IF ( ibc_uv_t == 0 ) THEN
	198	!$acc kernels present( u_init, u_p, v_init, v_p )
	199	u_p(nzt+1,:,:) = u_init(nzt+1)
	200	v_p(nzt+1,:,:) = v_init(nzt+1)
	201	!$acc end kernels
[1762]	202	ELSEIF ( ibc_uv_t == 1 ) THEN
[1113]	203	!$acc kernels present( u_p, v_p )
	204	u_p(nzt+1,:,:) = u_p(nzt,:,:)
	205	v_p(nzt+1,:,:) = v_p(nzt,:,:)
	206	!$acc end kernels
	207	ENDIF
	208
[1762]	209	IF ( .NOT. nest_domain ) THEN
	210	!$acc kernels present( w_p )
	211	w_p(nzt:nzt+1,:,:) = 0.0_wp ! nzt is not a prognostic level (but cf. pres)
	212	!$acc end kernels
	213	ENDIF
	214
[1113]	215	!
	216	!-- Temperature at bottom boundary.
	217	!-- In case of coupled runs (ibc_pt_b = 2) the temperature is given by
	218	!-- the sea surface temperature of the coupled ocean model.
	219	IF ( ibc_pt_b == 0 ) THEN
	220	!$acc kernels present( nzb_s_inner, pt, pt_p )
[1257]	221	!$acc loop independent
[667]	222	DO i = nxlg, nxrg
[1257]	223	!$acc loop independent
[667]	224	DO j = nysg, nyng
[1113]	225	pt_p(nzb_s_inner(j,i),j,i) = pt(nzb_s_inner(j,i),j,i)
[1]	226	ENDDO
	227	ENDDO
[1113]	228	!$acc end kernels
	229	ELSEIF ( ibc_pt_b == 1 ) THEN
	230	!$acc kernels present( nzb_s_inner, pt_p )
[1257]	231	!$acc loop independent
[1113]	232	DO i = nxlg, nxrg
[1257]	233	!$acc loop independent
[1113]	234	DO j = nysg, nyng
	235	pt_p(nzb_s_inner(j,i),j,i) = pt_p(nzb_s_inner(j,i)+1,j,i)
	236	ENDDO
	237	ENDDO
	238	!$acc end kernels
	239	ENDIF
[1]	240
	241	!
[1113]	242	!-- Temperature at top boundary
	243	IF ( ibc_pt_t == 0 ) THEN
	244	!$acc kernels present( pt, pt_p )
	245	pt_p(nzt+1,:,:) = pt(nzt+1,:,:)
[1380]	246	!
	247	!-- In case of nudging adjust top boundary to pt which is
	248	!-- read in from NUDGING-DATA
	249	IF ( nudging ) THEN
	250	pt_p(nzt+1,:,:) = pt_init(nzt+1)
	251	ENDIF
[1113]	252	!$acc end kernels
	253	ELSEIF ( ibc_pt_t == 1 ) THEN
	254	!$acc kernels present( pt_p )
	255	pt_p(nzt+1,:,:) = pt_p(nzt,:,:)
	256	!$acc end kernels
	257	ELSEIF ( ibc_pt_t == 2 ) THEN
	258	!$acc kernels present( dzu, pt_p )
	259	pt_p(nzt+1,:,:) = pt_p(nzt,:,:) + bc_pt_t_val * dzu(nzt+1)
	260	!$acc end kernels
	261	ENDIF
[1]	262
	263	!
[1113]	264	!-- Boundary conditions for TKE
	265	!-- Generally Neumann conditions with de/dz=0 are assumed
	266	IF ( .NOT. constant_diffusion ) THEN
	267	!$acc kernels present( e_p, nzb_s_inner )
[1257]	268	!$acc loop independent
[1113]	269	DO i = nxlg, nxrg
[1257]	270	!$acc loop independent
[1113]	271	DO j = nysg, nyng
	272	e_p(nzb_s_inner(j,i),j,i) = e_p(nzb_s_inner(j,i)+1,j,i)
[73]	273	ENDDO
[1113]	274	ENDDO
[1762]	275	IF ( .NOT. nest_domain ) THEN
	276	e_p(nzt+1,:,:) = e_p(nzt,:,:)
	277	ENDIF
[1113]	278	!$acc end kernels
	279	ENDIF
	280
	281	!
	282	!-- Boundary conditions for salinity
	283	IF ( ocean ) THEN
	284	!
	285	!-- Bottom boundary: Neumann condition because salinity flux is always
	286	!-- given
	287	DO i = nxlg, nxrg
	288	DO j = nysg, nyng
	289	sa_p(nzb_s_inner(j,i),j,i) = sa_p(nzb_s_inner(j,i)+1,j,i)
[1]	290	ENDDO
[1113]	291	ENDDO
[1]	292
	293	!
[1113]	294	!-- Top boundary: Dirichlet or Neumann
	295	IF ( ibc_sa_t == 0 ) THEN
	296	sa_p(nzt+1,:,:) = sa(nzt+1,:,:)
	297	ELSEIF ( ibc_sa_t == 1 ) THEN
	298	sa_p(nzt+1,:,:) = sa_p(nzt,:,:)
[1]	299	ENDIF
	300
[1113]	301	ENDIF
	302
[1]	303	!
[1113]	304	!-- Boundary conditions for total water content or scalar,
	305	!-- bottom and top boundary (see also temperature)
	306	IF ( humidity .OR. passive_scalar ) THEN
	307	!
	308	!-- Surface conditions for constant_humidity_flux
	309	IF ( ibc_q_b == 0 ) THEN
[667]	310	DO i = nxlg, nxrg
	311	DO j = nysg, nyng
[1113]	312	q_p(nzb_s_inner(j,i),j,i) = q(nzb_s_inner(j,i),j,i)
[1]	313	ENDDO
	314	ENDDO
[1113]	315	ELSE
[667]	316	DO i = nxlg, nxrg
	317	DO j = nysg, nyng
[1113]	318	q_p(nzb_s_inner(j,i),j,i) = q_p(nzb_s_inner(j,i)+1,j,i)
[95]	319	ENDDO
	320	ENDDO
[1113]	321	ENDIF
[95]	322	!
[1113]	323	!-- Top boundary
[1462]	324	IF ( ibc_q_t == 0 ) THEN
	325	q_p(nzt+1,:,:) = q(nzt+1,:,:)
	326	ELSEIF ( ibc_q_t == 1 ) THEN
	327	q_p(nzt+1,:,:) = q_p(nzt,:,:) + bc_q_t_val * dzu(nzt+1)
	328	ENDIF
[95]	329
[1822]	330	IF ( cloud_physics .AND. microphysics_seifert ) THEN
[1113]	331	!
[1361]	332	!-- Surface conditions rain water (Dirichlet)
[1115]	333	DO i = nxlg, nxrg
	334	DO j = nysg, nyng
[1361]	335	qr_p(nzb_s_inner(j,i),j,i) = 0.0_wp
	336	nr_p(nzb_s_inner(j,i),j,i) = 0.0_wp
[73]	337	ENDDO
[1115]	338	ENDDO
[1]	339	!
[1361]	340	!-- Top boundary condition for rain water (Dirichlet)
	341	qr_p(nzt+1,:,:) = 0.0_wp
	342	nr_p(nzt+1,:,:) = 0.0_wp
[1115]	343
[1]	344	ENDIF
[1409]	345	ENDIF
[1]	346	!
[1762]	347	!-- In case of inflow or nest boundary at the south boundary the boundary for v
	348	!-- is at nys and in case of inflow or nest boundary at the left boundary the
	349	!-- boundary for u is at nxl. Since in prognostic_equations (cache optimized
	350	!-- version) these levels are handled as a prognostic level, boundary values
	351	!-- have to be restored here.
[1409]	352	!-- For the SGS-TKE, Neumann boundary conditions are used at the inflow.
	353	IF ( inflow_s ) THEN
	354	v_p(:,nys,:) = v_p(:,nys-1,:)
	355	IF ( .NOT. constant_diffusion ) e_p(:,nys-1,:) = e_p(:,nys,:)
	356	ELSEIF ( inflow_n ) THEN
	357	IF ( .NOT. constant_diffusion ) e_p(:,nyn+1,:) = e_p(:,nyn,:)
	358	ELSEIF ( inflow_l ) THEN
	359	u_p(:,:,nxl) = u_p(:,:,nxl-1)
	360	IF ( .NOT. constant_diffusion ) e_p(:,:,nxl-1) = e_p(:,:,nxl)
	361	ELSEIF ( inflow_r ) THEN
	362	IF ( .NOT. constant_diffusion ) e_p(:,:,nxr+1) = e_p(:,:,nxr)
	363	ENDIF
[1]	364
	365	!
[1762]	366	!-- The same restoration for u at i=nxl and v at j=nys as above must be made
[1933]	367	!-- in case of nest boundaries. This must not be done in case of vertical nesting
	368	!-- mode as in that case the lateral boundaries are actually cyclic.
	369	IF ( nesting_mode /= 'vertical' ) THEN
	370	IF ( nest_bound_s ) THEN
	371	v_p(:,nys,:) = v_p(:,nys-1,:)
	372	ENDIF
	373	IF ( nest_bound_l ) THEN
	374	u_p(:,:,nxl) = u_p(:,:,nxl-1)
	375	ENDIF
[1762]	376	ENDIF
	377
	378	!
[1409]	379	!-- Lateral boundary conditions for scalar quantities at the outflow
	380	IF ( outflow_s ) THEN
	381	pt_p(:,nys-1,:) = pt_p(:,nys,:)
	382	IF ( .NOT. constant_diffusion ) e_p(:,nys-1,:) = e_p(:,nys,:)
	383	IF ( humidity .OR. passive_scalar ) THEN
	384	q_p(:,nys-1,:) = q_p(:,nys,:)
[1822]	385	IF ( cloud_physics .AND. microphysics_seifert ) THEN
[1409]	386	qr_p(:,nys-1,:) = qr_p(:,nys,:)
	387	nr_p(:,nys-1,:) = nr_p(:,nys,:)
[1053]	388	ENDIF
[1409]	389	ENDIF
	390	ELSEIF ( outflow_n ) THEN
	391	pt_p(:,nyn+1,:) = pt_p(:,nyn,:)
	392	IF ( .NOT. constant_diffusion ) e_p(:,nyn+1,:) = e_p(:,nyn,:)
	393	IF ( humidity .OR. passive_scalar ) THEN
	394	q_p(:,nyn+1,:) = q_p(:,nyn,:)
[1822]	395	IF ( cloud_physics .AND. microphysics_seifert ) THEN
[1409]	396	qr_p(:,nyn+1,:) = qr_p(:,nyn,:)
	397	nr_p(:,nyn+1,:) = nr_p(:,nyn,:)
[1053]	398	ENDIF
[1409]	399	ENDIF
	400	ELSEIF ( outflow_l ) THEN
	401	pt_p(:,:,nxl-1) = pt_p(:,:,nxl)
	402	IF ( .NOT. constant_diffusion ) e_p(:,:,nxl-1) = e_p(:,:,nxl)
	403	IF ( humidity .OR. passive_scalar ) THEN
	404	q_p(:,:,nxl-1) = q_p(:,:,nxl)
[1822]	405	IF ( cloud_physics .AND. microphysics_seifert ) THEN
[1409]	406	qr_p(:,:,nxl-1) = qr_p(:,:,nxl)
	407	nr_p(:,:,nxl-1) = nr_p(:,:,nxl)
[1053]	408	ENDIF
[1409]	409	ENDIF
	410	ELSEIF ( outflow_r ) THEN
	411	pt_p(:,:,nxr+1) = pt_p(:,:,nxr)
	412	IF ( .NOT. constant_diffusion ) e_p(:,:,nxr+1) = e_p(:,:,nxr)
	413	IF ( humidity .OR. passive_scalar ) THEN
	414	q_p(:,:,nxr+1) = q_p(:,:,nxr)
[1822]	415	IF ( cloud_physics .AND. microphysics_seifert ) THEN
[1409]	416	qr_p(:,:,nxr+1) = qr_p(:,:,nxr)
	417	nr_p(:,:,nxr+1) = nr_p(:,:,nxr)
[1053]	418	ENDIF
[1]	419	ENDIF
	420	ENDIF
	421
	422	!
[1159]	423	!-- Radiation boundary conditions for the velocities at the respective outflow.
	424	!-- The phase velocity is either assumed to the maximum phase velocity that
	425	!-- ensures numerical stability (CFL-condition) or calculated after
	426	!-- Orlanski(1976) and averaged along the outflow boundary.
[106]	427	IF ( outflow_s ) THEN
[75]	428
[1159]	429	IF ( use_cmax ) THEN
	430	u_p(:,-1,:) = u(:,0,:)
	431	v_p(:,0,:) = v(:,1,:)
	432	w_p(:,-1,:) = w(:,0,:)
	433	ELSEIF ( .NOT. use_cmax ) THEN
[75]	434
[978]	435	c_max = dy / dt_3d
[75]	436
[1353]	437	c_u_m_l = 0.0_wp
	438	c_v_m_l = 0.0_wp
	439	c_w_m_l = 0.0_wp
[978]	440
[1353]	441	c_u_m = 0.0_wp
	442	c_v_m = 0.0_wp
	443	c_w_m = 0.0_wp
[978]	444
[75]	445	!
[996]	446	!-- Calculate the phase speeds for u, v, and w, first local and then
	447	!-- average along the outflow boundary.
	448	DO k = nzb+1, nzt+1
	449	DO i = nxl, nxr
[75]	450
[106]	451	denom = u_m_s(k,0,i) - u_m_s(k,1,i)
	452
[1353]	453	IF ( denom /= 0.0_wp ) THEN
[996]	454	c_u(k,i) = -c_max * ( u(k,0,i) - u_m_s(k,0,i) ) / ( denom * tsc(2) )
[1353]	455	IF ( c_u(k,i) < 0.0_wp ) THEN
	456	c_u(k,i) = 0.0_wp
[106]	457	ELSEIF ( c_u(k,i) > c_max ) THEN
	458	c_u(k,i) = c_max
	459	ENDIF
	460	ELSE
	461	c_u(k,i) = c_max
[75]	462	ENDIF
	463
[106]	464	denom = v_m_s(k,1,i) - v_m_s(k,2,i)
	465
[1353]	466	IF ( denom /= 0.0_wp ) THEN
[996]	467	c_v(k,i) = -c_max * ( v(k,1,i) - v_m_s(k,1,i) ) / ( denom * tsc(2) )
[1353]	468	IF ( c_v(k,i) < 0.0_wp ) THEN
	469	c_v(k,i) = 0.0_wp
[106]	470	ELSEIF ( c_v(k,i) > c_max ) THEN
	471	c_v(k,i) = c_max
	472	ENDIF
	473	ELSE
	474	c_v(k,i) = c_max
[75]	475	ENDIF
	476
[106]	477	denom = w_m_s(k,0,i) - w_m_s(k,1,i)
[75]	478
[1353]	479	IF ( denom /= 0.0_wp ) THEN
[996]	480	c_w(k,i) = -c_max * ( w(k,0,i) - w_m_s(k,0,i) ) / ( denom * tsc(2) )
[1353]	481	IF ( c_w(k,i) < 0.0_wp ) THEN
	482	c_w(k,i) = 0.0_wp
[106]	483	ELSEIF ( c_w(k,i) > c_max ) THEN
	484	c_w(k,i) = c_max
	485	ENDIF
	486	ELSE
	487	c_w(k,i) = c_max
[75]	488	ENDIF
[106]	489
[978]	490	c_u_m_l(k) = c_u_m_l(k) + c_u(k,i)
	491	c_v_m_l(k) = c_v_m_l(k) + c_v(k,i)
	492	c_w_m_l(k) = c_w_m_l(k) + c_w(k,i)
[106]	493
[978]	494	ENDDO
	495	ENDDO
[75]	496
[978]	497	#if defined( __parallel )
	498	IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr )
	499	CALL MPI_ALLREDUCE( c_u_m_l(nzb+1), c_u_m(nzb+1), nzt-nzb, MPI_REAL, &
	500	MPI_SUM, comm1dx, ierr )
	501	IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr )
	502	CALL MPI_ALLREDUCE( c_v_m_l(nzb+1), c_v_m(nzb+1), nzt-nzb, MPI_REAL, &
	503	MPI_SUM, comm1dx, ierr )
	504	IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr )
	505	CALL MPI_ALLREDUCE( c_w_m_l(nzb+1), c_w_m(nzb+1), nzt-nzb, MPI_REAL, &
	506	MPI_SUM, comm1dx, ierr )
	507	#else
	508	c_u_m = c_u_m_l
	509	c_v_m = c_v_m_l
	510	c_w_m = c_w_m_l
	511	#endif
	512
	513	c_u_m = c_u_m / (nx+1)
	514	c_v_m = c_v_m / (nx+1)
	515	c_w_m = c_w_m / (nx+1)
	516
[75]	517	!
[978]	518	!-- Save old timelevels for the next timestep
	519	IF ( intermediate_timestep_count == 1 ) THEN
	520	u_m_s(:,:,:) = u(:,0:1,:)
	521	v_m_s(:,:,:) = v(:,1:2,:)
	522	w_m_s(:,:,:) = w(:,0:1,:)
	523	ENDIF
	524
	525	!
	526	!-- Calculate the new velocities
[996]	527	DO k = nzb+1, nzt+1
	528	DO i = nxlg, nxrg
[978]	529	u_p(k,-1,i) = u(k,-1,i) - dt_3d * tsc(2) * c_u_m(k) * &
[75]	530	( u(k,-1,i) - u(k,0,i) ) * ddy
	531
[978]	532	v_p(k,0,i) = v(k,0,i) - dt_3d * tsc(2) * c_v_m(k) * &
[106]	533	( v(k,0,i) - v(k,1,i) ) * ddy
[75]	534
[978]	535	w_p(k,-1,i) = w(k,-1,i) - dt_3d * tsc(2) * c_w_m(k) * &
[75]	536	( w(k,-1,i) - w(k,0,i) ) * ddy
[978]	537	ENDDO
[75]	538	ENDDO
	539
	540	!
[978]	541	!-- Bottom boundary at the outflow
	542	IF ( ibc_uv_b == 0 ) THEN
[1353]	543	u_p(nzb,-1,:) = 0.0_wp
	544	v_p(nzb,0,:) = 0.0_wp
[978]	545	ELSE
	546	u_p(nzb,-1,:) = u_p(nzb+1,-1,:)
	547	v_p(nzb,0,:) = v_p(nzb+1,0,:)
	548	ENDIF
[1353]	549	w_p(nzb,-1,:) = 0.0_wp
[73]	550
[75]	551	!
[978]	552	!-- Top boundary at the outflow
	553	IF ( ibc_uv_t == 0 ) THEN
	554	u_p(nzt+1,-1,:) = u_init(nzt+1)
	555	v_p(nzt+1,0,:) = v_init(nzt+1)
	556	ELSE
[1742]	557	u_p(nzt+1,-1,:) = u_p(nzt,-1,:)
	558	v_p(nzt+1,0,:) = v_p(nzt,0,:)
[978]	559	ENDIF
[1353]	560	w_p(nzt:nzt+1,-1,:) = 0.0_wp
[978]	561
[75]	562	ENDIF
[73]	563
[75]	564	ENDIF
[73]	565
[106]	566	IF ( outflow_n ) THEN
[73]	567
[1159]	568	IF ( use_cmax ) THEN
	569	u_p(:,ny+1,:) = u(:,ny,:)
	570	v_p(:,ny+1,:) = v(:,ny,:)
	571	w_p(:,ny+1,:) = w(:,ny,:)
	572	ELSEIF ( .NOT. use_cmax ) THEN
[75]	573
[978]	574	c_max = dy / dt_3d
[75]	575
[1353]	576	c_u_m_l = 0.0_wp
	577	c_v_m_l = 0.0_wp
	578	c_w_m_l = 0.0_wp
[978]	579
[1353]	580	c_u_m = 0.0_wp
	581	c_v_m = 0.0_wp
	582	c_w_m = 0.0_wp
[978]	583
[1]	584	!
[996]	585	!-- Calculate the phase speeds for u, v, and w, first local and then
	586	!-- average along the outflow boundary.
	587	DO k = nzb+1, nzt+1
	588	DO i = nxl, nxr
[73]	589
[106]	590	denom = u_m_n(k,ny,i) - u_m_n(k,ny-1,i)
	591
[1353]	592	IF ( denom /= 0.0_wp ) THEN
[996]	593	c_u(k,i) = -c_max * ( u(k,ny,i) - u_m_n(k,ny,i) ) / ( denom * tsc(2) )
[1353]	594	IF ( c_u(k,i) < 0.0_wp ) THEN
	595	c_u(k,i) = 0.0_wp
[106]	596	ELSEIF ( c_u(k,i) > c_max ) THEN
	597	c_u(k,i) = c_max
	598	ENDIF
	599	ELSE
	600	c_u(k,i) = c_max
[73]	601	ENDIF
	602
[106]	603	denom = v_m_n(k,ny,i) - v_m_n(k,ny-1,i)
[73]	604
[1353]	605	IF ( denom /= 0.0_wp ) THEN
[996]	606	c_v(k,i) = -c_max * ( v(k,ny,i) - v_m_n(k,ny,i) ) / ( denom * tsc(2) )
[1353]	607	IF ( c_v(k,i) < 0.0_wp ) THEN
	608	c_v(k,i) = 0.0_wp
[106]	609	ELSEIF ( c_v(k,i) > c_max ) THEN
	610	c_v(k,i) = c_max
	611	ENDIF
	612	ELSE
	613	c_v(k,i) = c_max
[73]	614	ENDIF
	615
[106]	616	denom = w_m_n(k,ny,i) - w_m_n(k,ny-1,i)
[73]	617
[1353]	618	IF ( denom /= 0.0_wp ) THEN
[996]	619	c_w(k,i) = -c_max * ( w(k,ny,i) - w_m_n(k,ny,i) ) / ( denom * tsc(2) )
[1353]	620	IF ( c_w(k,i) < 0.0_wp ) THEN
	621	c_w(k,i) = 0.0_wp
[106]	622	ELSEIF ( c_w(k,i) > c_max ) THEN
	623	c_w(k,i) = c_max
	624	ENDIF
	625	ELSE
	626	c_w(k,i) = c_max
[73]	627	ENDIF
[106]	628
[978]	629	c_u_m_l(k) = c_u_m_l(k) + c_u(k,i)
	630	c_v_m_l(k) = c_v_m_l(k) + c_v(k,i)
	631	c_w_m_l(k) = c_w_m_l(k) + c_w(k,i)
[106]	632
[978]	633	ENDDO
	634	ENDDO
[73]	635
[978]	636	#if defined( __parallel )
	637	IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr )
	638	CALL MPI_ALLREDUCE( c_u_m_l(nzb+1), c_u_m(nzb+1), nzt-nzb, MPI_REAL, &
	639	MPI_SUM, comm1dx, ierr )
	640	IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr )
	641	CALL MPI_ALLREDUCE( c_v_m_l(nzb+1), c_v_m(nzb+1), nzt-nzb, MPI_REAL, &
	642	MPI_SUM, comm1dx, ierr )
	643	IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr )
	644	CALL MPI_ALLREDUCE( c_w_m_l(nzb+1), c_w_m(nzb+1), nzt-nzb, MPI_REAL, &
	645	MPI_SUM, comm1dx, ierr )
	646	#else
	647	c_u_m = c_u_m_l
	648	c_v_m = c_v_m_l
	649	c_w_m = c_w_m_l
	650	#endif
	651
	652	c_u_m = c_u_m / (nx+1)
	653	c_v_m = c_v_m / (nx+1)
	654	c_w_m = c_w_m / (nx+1)
	655
[73]	656	!
[978]	657	!-- Save old timelevels for the next timestep
	658	IF ( intermediate_timestep_count == 1 ) THEN
	659	u_m_n(:,:,:) = u(:,ny-1:ny,:)
	660	v_m_n(:,:,:) = v(:,ny-1:ny,:)
	661	w_m_n(:,:,:) = w(:,ny-1:ny,:)
	662	ENDIF
[73]	663
[978]	664	!
	665	!-- Calculate the new velocities
[996]	666	DO k = nzb+1, nzt+1
	667	DO i = nxlg, nxrg
[978]	668	u_p(k,ny+1,i) = u(k,ny+1,i) - dt_3d * tsc(2) * c_u_m(k) * &
	669	( u(k,ny+1,i) - u(k,ny,i) ) * ddy
[73]	670
[978]	671	v_p(k,ny+1,i) = v(k,ny+1,i) - dt_3d * tsc(2) * c_v_m(k) * &
	672	( v(k,ny+1,i) - v(k,ny,i) ) * ddy
[73]	673
[978]	674	w_p(k,ny+1,i) = w(k,ny+1,i) - dt_3d * tsc(2) * c_w_m(k) * &
	675	( w(k,ny+1,i) - w(k,ny,i) ) * ddy
	676	ENDDO
[1]	677	ENDDO
	678
	679	!
[978]	680	!-- Bottom boundary at the outflow
	681	IF ( ibc_uv_b == 0 ) THEN
[1353]	682	u_p(nzb,ny+1,:) = 0.0_wp
	683	v_p(nzb,ny+1,:) = 0.0_wp
[978]	684	ELSE
	685	u_p(nzb,ny+1,:) = u_p(nzb+1,ny+1,:)
	686	v_p(nzb,ny+1,:) = v_p(nzb+1,ny+1,:)
	687	ENDIF
[1353]	688	w_p(nzb,ny+1,:) = 0.0_wp
[73]	689
	690	!
[978]	691	!-- Top boundary at the outflow
	692	IF ( ibc_uv_t == 0 ) THEN
	693	u_p(nzt+1,ny+1,:) = u_init(nzt+1)
	694	v_p(nzt+1,ny+1,:) = v_init(nzt+1)
	695	ELSE
	696	u_p(nzt+1,ny+1,:) = u_p(nzt,nyn+1,:)
	697	v_p(nzt+1,ny+1,:) = v_p(nzt,nyn+1,:)
	698	ENDIF
[1353]	699	w_p(nzt:nzt+1,ny+1,:) = 0.0_wp
[978]	700
[1]	701	ENDIF
	702
[75]	703	ENDIF
	704
[106]	705	IF ( outflow_l ) THEN
[75]	706
[1159]	707	IF ( use_cmax ) THEN
[1717]	708	u_p(:,:,0) = u(:,:,1)
	709	v_p(:,:,-1) = v(:,:,0)
[1159]	710	w_p(:,:,-1) = w(:,:,0)
	711	ELSEIF ( .NOT. use_cmax ) THEN
[75]	712
[978]	713	c_max = dx / dt_3d
[75]	714
[1353]	715	c_u_m_l = 0.0_wp
	716	c_v_m_l = 0.0_wp
	717	c_w_m_l = 0.0_wp
[978]	718
[1353]	719	c_u_m = 0.0_wp
	720	c_v_m = 0.0_wp
	721	c_w_m = 0.0_wp
[978]	722
[1]	723	!
[996]	724	!-- Calculate the phase speeds for u, v, and w, first local and then
	725	!-- average along the outflow boundary.
	726	DO k = nzb+1, nzt+1
	727	DO j = nys, nyn
[75]	728
[106]	729	denom = u_m_l(k,j,1) - u_m_l(k,j,2)
	730
[1353]	731	IF ( denom /= 0.0_wp ) THEN
[996]	732	c_u(k,j) = -c_max * ( u(k,j,1) - u_m_l(k,j,1) ) / ( denom * tsc(2) )
[1353]	733	IF ( c_u(k,j) < 0.0_wp ) THEN
	734	c_u(k,j) = 0.0_wp
[107]	735	ELSEIF ( c_u(k,j) > c_max ) THEN
	736	c_u(k,j) = c_max
[106]	737	ENDIF
	738	ELSE
[107]	739	c_u(k,j) = c_max
[75]	740	ENDIF
	741
[106]	742	denom = v_m_l(k,j,0) - v_m_l(k,j,1)
[75]	743
[1353]	744	IF ( denom /= 0.0_wp ) THEN
[996]	745	c_v(k,j) = -c_max * ( v(k,j,0) - v_m_l(k,j,0) ) / ( denom * tsc(2) )
[1353]	746	IF ( c_v(k,j) < 0.0_wp ) THEN
	747	c_v(k,j) = 0.0_wp
[106]	748	ELSEIF ( c_v(k,j) > c_max ) THEN
	749	c_v(k,j) = c_max
	750	ENDIF
	751	ELSE
	752	c_v(k,j) = c_max
[75]	753	ENDIF
	754
[106]	755	denom = w_m_l(k,j,0) - w_m_l(k,j,1)
[75]	756
[1353]	757	IF ( denom /= 0.0_wp ) THEN
[996]	758	c_w(k,j) = -c_max * ( w(k,j,0) - w_m_l(k,j,0) ) / ( denom * tsc(2) )
[1353]	759	IF ( c_w(k,j) < 0.0_wp ) THEN
	760	c_w(k,j) = 0.0_wp
[106]	761	ELSEIF ( c_w(k,j) > c_max ) THEN
	762	c_w(k,j) = c_max
	763	ENDIF
	764	ELSE
	765	c_w(k,j) = c_max
[75]	766	ENDIF
[106]	767
[978]	768	c_u_m_l(k) = c_u_m_l(k) + c_u(k,j)
	769	c_v_m_l(k) = c_v_m_l(k) + c_v(k,j)
	770	c_w_m_l(k) = c_w_m_l(k) + c_w(k,j)
[106]	771
[978]	772	ENDDO
	773	ENDDO
[75]	774
[978]	775	#if defined( __parallel )
	776	IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr )
	777	CALL MPI_ALLREDUCE( c_u_m_l(nzb+1), c_u_m(nzb+1), nzt-nzb, MPI_REAL, &
	778	MPI_SUM, comm1dy, ierr )
	779	IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr )
	780	CALL MPI_ALLREDUCE( c_v_m_l(nzb+1), c_v_m(nzb+1), nzt-nzb, MPI_REAL, &
	781	MPI_SUM, comm1dy, ierr )
	782	IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr )
	783	CALL MPI_ALLREDUCE( c_w_m_l(nzb+1), c_w_m(nzb+1), nzt-nzb, MPI_REAL, &
	784	MPI_SUM, comm1dy, ierr )
	785	#else
	786	c_u_m = c_u_m_l
	787	c_v_m = c_v_m_l
	788	c_w_m = c_w_m_l
	789	#endif
	790
	791	c_u_m = c_u_m / (ny+1)
	792	c_v_m = c_v_m / (ny+1)
	793	c_w_m = c_w_m / (ny+1)
	794
[73]	795	!
[978]	796	!-- Save old timelevels for the next timestep
	797	IF ( intermediate_timestep_count == 1 ) THEN
	798	u_m_l(:,:,:) = u(:,:,1:2)
	799	v_m_l(:,:,:) = v(:,:,0:1)
	800	w_m_l(:,:,:) = w(:,:,0:1)
	801	ENDIF
	802
	803	!
	804	!-- Calculate the new velocities
[996]	805	DO k = nzb+1, nzt+1
[1113]	806	DO j = nysg, nyng
[978]	807	u_p(k,j,0) = u(k,j,0) - dt_3d * tsc(2) * c_u_m(k) * &
[106]	808	( u(k,j,0) - u(k,j,1) ) * ddx
[75]	809
[978]	810	v_p(k,j,-1) = v(k,j,-1) - dt_3d * tsc(2) * c_v_m(k) * &
[75]	811	( v(k,j,-1) - v(k,j,0) ) * ddx
	812
[978]	813	w_p(k,j,-1) = w(k,j,-1) - dt_3d * tsc(2) * c_w_m(k) * &
[75]	814	( w(k,j,-1) - w(k,j,0) ) * ddx
[978]	815	ENDDO
[75]	816	ENDDO
	817
	818	!
[978]	819	!-- Bottom boundary at the outflow
	820	IF ( ibc_uv_b == 0 ) THEN
[1353]	821	u_p(nzb,:,0) = 0.0_wp
	822	v_p(nzb,:,-1) = 0.0_wp
[978]	823	ELSE
	824	u_p(nzb,:,0) = u_p(nzb+1,:,0)
	825	v_p(nzb,:,-1) = v_p(nzb+1,:,-1)
	826	ENDIF
[1353]	827	w_p(nzb,:,-1) = 0.0_wp
[1]	828
[75]	829	!
[978]	830	!-- Top boundary at the outflow
	831	IF ( ibc_uv_t == 0 ) THEN
[1764]	832	u_p(nzt+1,:,0) = u_init(nzt+1)
[978]	833	v_p(nzt+1,:,-1) = v_init(nzt+1)
	834	ELSE
[1764]	835	u_p(nzt+1,:,0) = u_p(nzt,:,0)
[978]	836	v_p(nzt+1,:,-1) = v_p(nzt,:,-1)
	837	ENDIF
[1353]	838	w_p(nzt:nzt+1,:,-1) = 0.0_wp
[978]	839
[75]	840	ENDIF
[73]	841
[75]	842	ENDIF
[73]	843
[106]	844	IF ( outflow_r ) THEN
[73]	845
[1159]	846	IF ( use_cmax ) THEN
	847	u_p(:,:,nx+1) = u(:,:,nx)
	848	v_p(:,:,nx+1) = v(:,:,nx)
	849	w_p(:,:,nx+1) = w(:,:,nx)
	850	ELSEIF ( .NOT. use_cmax ) THEN
[75]	851
[978]	852	c_max = dx / dt_3d
[75]	853
[1353]	854	c_u_m_l = 0.0_wp
	855	c_v_m_l = 0.0_wp
	856	c_w_m_l = 0.0_wp
[978]	857
[1353]	858	c_u_m = 0.0_wp
	859	c_v_m = 0.0_wp
	860	c_w_m = 0.0_wp
[978]	861
[1]	862	!
[996]	863	!-- Calculate the phase speeds for u, v, and w, first local and then
	864	!-- average along the outflow boundary.
	865	DO k = nzb+1, nzt+1
	866	DO j = nys, nyn
[73]	867
[106]	868	denom = u_m_r(k,j,nx) - u_m_r(k,j,nx-1)
	869
[1353]	870	IF ( denom /= 0.0_wp ) THEN
[996]	871	c_u(k,j) = -c_max * ( u(k,j,nx) - u_m_r(k,j,nx) ) / ( denom * tsc(2) )
[1353]	872	IF ( c_u(k,j) < 0.0_wp ) THEN
	873	c_u(k,j) = 0.0_wp
[106]	874	ELSEIF ( c_u(k,j) > c_max ) THEN
	875	c_u(k,j) = c_max
	876	ENDIF
	877	ELSE
	878	c_u(k,j) = c_max
[73]	879	ENDIF
	880
[106]	881	denom = v_m_r(k,j,nx) - v_m_r(k,j,nx-1)
[73]	882
[1353]	883	IF ( denom /= 0.0_wp ) THEN
[996]	884	c_v(k,j) = -c_max * ( v(k,j,nx) - v_m_r(k,j,nx) ) / ( denom * tsc(2) )
[1353]	885	IF ( c_v(k,j) < 0.0_wp ) THEN
	886	c_v(k,j) = 0.0_wp
[106]	887	ELSEIF ( c_v(k,j) > c_max ) THEN
	888	c_v(k,j) = c_max
	889	ENDIF
	890	ELSE
	891	c_v(k,j) = c_max
[73]	892	ENDIF
	893
[106]	894	denom = w_m_r(k,j,nx) - w_m_r(k,j,nx-1)
[73]	895
[1353]	896	IF ( denom /= 0.0_wp ) THEN
[996]	897	c_w(k,j) = -c_max * ( w(k,j,nx) - w_m_r(k,j,nx) ) / ( denom * tsc(2) )
[1353]	898	IF ( c_w(k,j) < 0.0_wp ) THEN
	899	c_w(k,j) = 0.0_wp
[106]	900	ELSEIF ( c_w(k,j) > c_max ) THEN
	901	c_w(k,j) = c_max
	902	ENDIF
	903	ELSE
	904	c_w(k,j) = c_max
[73]	905	ENDIF
[106]	906
[978]	907	c_u_m_l(k) = c_u_m_l(k) + c_u(k,j)
	908	c_v_m_l(k) = c_v_m_l(k) + c_v(k,j)
	909	c_w_m_l(k) = c_w_m_l(k) + c_w(k,j)
[106]	910
[978]	911	ENDDO
	912	ENDDO
[73]	913
[978]	914	#if defined( __parallel )
	915	IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr )
	916	CALL MPI_ALLREDUCE( c_u_m_l(nzb+1), c_u_m(nzb+1), nzt-nzb, MPI_REAL, &
	917	MPI_SUM, comm1dy, ierr )
	918	IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr )
	919	CALL MPI_ALLREDUCE( c_v_m_l(nzb+1), c_v_m(nzb+1), nzt-nzb, MPI_REAL, &
	920	MPI_SUM, comm1dy, ierr )
	921	IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr )
	922	CALL MPI_ALLREDUCE( c_w_m_l(nzb+1), c_w_m(nzb+1), nzt-nzb, MPI_REAL, &
	923	MPI_SUM, comm1dy, ierr )
	924	#else
	925	c_u_m = c_u_m_l
	926	c_v_m = c_v_m_l
	927	c_w_m = c_w_m_l
	928	#endif
	929
	930	c_u_m = c_u_m / (ny+1)
	931	c_v_m = c_v_m / (ny+1)
	932	c_w_m = c_w_m / (ny+1)
	933
[73]	934	!
[978]	935	!-- Save old timelevels for the next timestep
	936	IF ( intermediate_timestep_count == 1 ) THEN
	937	u_m_r(:,:,:) = u(:,:,nx-1:nx)
	938	v_m_r(:,:,:) = v(:,:,nx-1:nx)
	939	w_m_r(:,:,:) = w(:,:,nx-1:nx)
	940	ENDIF
[73]	941
[978]	942	!
	943	!-- Calculate the new velocities
[996]	944	DO k = nzb+1, nzt+1
[1113]	945	DO j = nysg, nyng
[978]	946	u_p(k,j,nx+1) = u(k,j,nx+1) - dt_3d * tsc(2) * c_u_m(k) * &
	947	( u(k,j,nx+1) - u(k,j,nx) ) * ddx
[73]	948
[978]	949	v_p(k,j,nx+1) = v(k,j,nx+1) - dt_3d * tsc(2) * c_v_m(k) * &
	950	( v(k,j,nx+1) - v(k,j,nx) ) * ddx
[73]	951
[978]	952	w_p(k,j,nx+1) = w(k,j,nx+1) - dt_3d * tsc(2) * c_w_m(k) * &
	953	( w(k,j,nx+1) - w(k,j,nx) ) * ddx
	954	ENDDO
[73]	955	ENDDO
	956
	957	!
[978]	958	!-- Bottom boundary at the outflow
	959	IF ( ibc_uv_b == 0 ) THEN
[1353]	960	u_p(nzb,:,nx+1) = 0.0_wp
	961	v_p(nzb,:,nx+1) = 0.0_wp
[978]	962	ELSE
	963	u_p(nzb,:,nx+1) = u_p(nzb+1,:,nx+1)
	964	v_p(nzb,:,nx+1) = v_p(nzb+1,:,nx+1)
	965	ENDIF
[1353]	966	w_p(nzb,:,nx+1) = 0.0_wp
[73]	967
	968	!
[978]	969	!-- Top boundary at the outflow
	970	IF ( ibc_uv_t == 0 ) THEN
	971	u_p(nzt+1,:,nx+1) = u_init(nzt+1)
	972	v_p(nzt+1,:,nx+1) = v_init(nzt+1)
	973	ELSE
	974	u_p(nzt+1,:,nx+1) = u_p(nzt,:,nx+1)
	975	v_p(nzt+1,:,nx+1) = v_p(nzt,:,nx+1)
	976	ENDIF
[1742]	977	w_p(nzt:nzt+1,:,nx+1) = 0.0_wp
[978]	978
[1]	979	ENDIF
	980
	981	ENDIF
	982
	983	END SUBROUTINE boundary_conds

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