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source: palm/trunk/SOURCE/diffusion_w.f90 @ 2039

Last change on this file since 2039 was 2038, checked in by knoop, 8 years ago
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[1873]	1	!> @file diffusion_w.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	!
[1818]	17	! Copyright 1997-2016 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[484]	20	! Current revisions:
[1]	21	! -----------------
[1341]	22	!
[2038]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: diffusion_w.f90 2038 2016-10-26 11:16:56Z gronemeier $
	27	!
[2038]	28	! 2037 2016-10-26 11:15:40Z knoop
	29	! Anelastic approximation implemented
	30	!
[2001]	31	! 2000 2016-08-20 18:09:15Z knoop
	32	! Forced header and separation lines into 80 columns
	33	!
[1874]	34	! 1873 2016-04-18 14:50:06Z maronga
	35	! Module renamed (removed _mod)
	36	!
	37	!
[1851]	38	! 1850 2016-04-08 13:29:27Z maronga
	39	! Module renamed
	40	!
	41	!
[1683]	42	! 1682 2015-10-07 23:56:08Z knoop
	43	! Code annotations made doxygen readable
	44	!
[1375]	45	! 1374 2014-04-25 12:55:07Z raasch
	46	! vsws + vswst removed from acc-present-list
	47	!
[1354]	48	! 1353 2014-04-08 15:21:23Z heinze
	49	! REAL constants provided with KIND-attribute
	50	!
[1341]	51	! 1340 2014-03-25 19:45:13Z kanani
	52	! REAL constants defined as wp-kind
	53	!
[1323]	54	! 1322 2014-03-20 16:38:49Z raasch
	55	! REAL constants defined as wp-kind
	56	!
[1321]	57	! 1320 2014-03-20 08:40:49Z raasch
[1320]	58	! ONLY-attribute added to USE-statements,
	59	! kind-parameters added to all INTEGER and REAL declaration statements,
	60	! kinds are defined in new module kinds,
	61	! revision history before 2012 removed,
	62	! comment fields (!:) to be used for variable explanations added to
	63	! all variable declaration statements
[1]	64	!
[1258]	65	! 1257 2013-11-08 15:18:40Z raasch
	66	! openacc loop and loop vector clauses removed, declare create moved after
	67	! the FORTRAN declaration statement
	68	!
[1132]	69	! 1128 2013-04-12 06:19:32Z raasch
	70	! loop index bounds in accelerator version replaced by i_left, i_right, j_south,
	71	! j_north
	72	!
[1037]	73	! 1036 2012-10-22 13:43:42Z raasch
	74	! code put under GPL (PALM 3.9)
	75	!
[1017]	76	! 1015 2012-09-27 09:23:24Z raasch
	77	! accelerator version (*_acc) added
	78	!
[1002]	79	! 1001 2012-09-13 14:08:46Z raasch
	80	! arrays comunicated by module instead of parameter list
	81	!
[979]	82	! 978 2012-08-09 08:28:32Z fricke
	83	! outflow damping layer removed
	84	! kmxm_x/_z and kmxp_x/_z change to kmxm and kmxp
	85	! kmym_y/_z and kmyp_y/_z change to kmym and kmyp
	86	!
[1]	87	! Revision 1.1 1997/09/12 06:24:11 raasch
	88	! Initial revision
	89	!
	90	!
	91	! Description:
	92	! ------------
[1682]	93	!> Diffusion term of the w-component
[1]	94	!------------------------------------------------------------------------------!
[1682]	95	MODULE diffusion_w_mod
	96
[1]	97
[1320]	98	USE wall_fluxes_mod, &
	99	ONLY : wall_fluxes, wall_fluxes_acc
[56]	100
[1]	101	PRIVATE
[1015]	102	PUBLIC diffusion_w, diffusion_w_acc
[1]	103
	104	INTERFACE diffusion_w
	105	MODULE PROCEDURE diffusion_w
	106	MODULE PROCEDURE diffusion_w_ij
	107	END INTERFACE diffusion_w
	108
[1015]	109	INTERFACE diffusion_w_acc
	110	MODULE PROCEDURE diffusion_w_acc
	111	END INTERFACE diffusion_w_acc
	112
[1]	113	CONTAINS
	114
	115
	116	!------------------------------------------------------------------------------!
[1682]	117	! Description:
	118	! ------------
	119	!> Call for all grid points
[1]	120	!------------------------------------------------------------------------------!
[1001]	121	SUBROUTINE diffusion_w
[1]	122
[1320]	123	USE arrays_3d, &
[2037]	124	ONLY : ddzu, ddzw, km, tend, u, v, w, drho_air_zw, rho_air
[1320]	125
	126	USE control_parameters, &
	127	ONLY : topography
	128
	129	USE grid_variables, &
	130	ONLY : ddx, ddy, fwxm, fwxp, fwym, fwyp, wall_w_x, wall_w_y
	131
	132	USE indices, &
	133	ONLY : nxl, nxr, nyn, nys, nzb, nzb_w_inner, nzb_w_outer, nzt
	134
	135	USE kinds
[1]	136
	137	IMPLICIT NONE
	138
[1682]	139	INTEGER(iwp) :: i !<
	140	INTEGER(iwp) :: j !<
	141	INTEGER(iwp) :: k !<
[1320]	142
[1682]	143	REAL(wp) :: kmxm !<
	144	REAL(wp) :: kmxp !<
	145	REAL(wp) :: kmym !<
	146	REAL(wp) :: kmyp !<
[1001]	147
[1682]	148	REAL(wp), DIMENSION(nzb:nzt+1,nys:nyn,nxl:nxr) :: wsus !<
	149	REAL(wp), DIMENSION(nzb:nzt+1,nys:nyn,nxl:nxr) :: wsvs !<
[1]	150
	151
[56]	152	!
	153	!-- First calculate horizontal momentum flux w'u' and/or w'v' at vertical
	154	!-- walls, if neccessary
	155	IF ( topography /= 'flat' ) THEN
[1320]	156	CALL wall_fluxes( wsus, 0.0_wp, 0.0_wp, 0.0_wp, 1.0_wp, nzb_w_inner, &
[56]	157	nzb_w_outer, wall_w_x )
[1320]	158	CALL wall_fluxes( wsvs, 0.0_wp, 0.0_wp, 1.0_wp, 0.0_wp, nzb_w_inner, &
[56]	159	nzb_w_outer, wall_w_y )
	160	ENDIF
	161
[1]	162	DO i = nxl, nxr
	163	DO j = nys, nyn
	164	DO k = nzb_w_outer(j,i)+1, nzt-1
	165	!
	166	!-- Interpolate eddy diffusivities on staggered gridpoints
[1322]	167	kmxp = 0.25_wp * &
[978]	168	( km(k,j,i)+km(k,j,i+1)+km(k+1,j,i)+km(k+1,j,i+1) )
[1322]	169	kmxm = 0.25_wp * &
[978]	170	( km(k,j,i)+km(k,j,i-1)+km(k+1,j,i)+km(k+1,j,i-1) )
[1322]	171	kmyp = 0.25_wp * &
[978]	172	( km(k,j,i)+km(k+1,j,i)+km(k,j+1,i)+km(k+1,j+1,i) )
[1322]	173	kmym = 0.25_wp * &
[978]	174	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
[1]	175
	176	tend(k,j,i) = tend(k,j,i) &
[978]	177	& + ( kmxp * ( w(k,j,i+1) - w(k,j,i) ) * ddx &
	178	& + kmxp * ( u(k+1,j,i+1) - u(k,j,i+1) ) * ddzu(k+1) &
	179	& - kmxm * ( w(k,j,i) - w(k,j,i-1) ) * ddx &
	180	& - kmxm * ( u(k+1,j,i) - u(k,j,i) ) * ddzu(k+1) &
[1]	181	& ) * ddx &
[978]	182	& + ( kmyp * ( w(k,j+1,i) - w(k,j,i) ) * ddy &
	183	& + kmyp * ( v(k+1,j+1,i) - v(k,j+1,i) ) * ddzu(k+1) &
	184	& - kmym * ( w(k,j,i) - w(k,j-1,i) ) * ddy &
	185	& - kmym * ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
[1]	186	& ) * ddy &
[1322]	187	& + 2.0_wp * ( &
[1]	188	& km(k+1,j,i) * ( w(k+1,j,i) - w(k,j,i) ) * ddzw(k+1) &
[2037]	189	& * rho_air(k+1) &
[1]	190	& - km(k,j,i) * ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) &
[2037]	191	& * rho_air(k) &
	192	& ) * ddzu(k+1) * drho_air_zw(k)
[1]	193	ENDDO
	194
	195	!
	196	!-- Wall functions at all vertical walls, where necessary
[1340]	197	IF ( wall_w_x(j,i) /= 0.0_wp .OR. wall_w_y(j,i) /= 0.0_wp ) THEN
[51]	198
[1]	199	DO k = nzb_w_inner(j,i)+1, nzb_w_outer(j,i)
	200	!
	201	!-- Interpolate eddy diffusivities on staggered gridpoints
[1322]	202	kmxp = 0.25_wp * &
[978]	203	( km(k,j,i)+km(k,j,i+1)+km(k+1,j,i)+km(k+1,j,i+1) )
[1322]	204	kmxm = 0.25_wp * &
[978]	205	( km(k,j,i)+km(k,j,i-1)+km(k+1,j,i)+km(k+1,j,i-1) )
[1322]	206	kmyp = 0.25_wp * &
[978]	207	( km(k,j,i)+km(k+1,j,i)+km(k,j+1,i)+km(k+1,j+1,i) )
[1322]	208	kmym = 0.25_wp * &
[978]	209	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
[1]	210
	211	tend(k,j,i) = tend(k,j,i) &
	212	+ ( fwxp(j,i) * ( &
[978]	213	kmxp * ( w(k,j,i+1) - w(k,j,i) ) * ddx &
	214	+ kmxp * ( u(k+1,j,i+1) - u(k,j,i+1) ) * ddzu(k+1) &
[1]	215	) &
	216	- fwxm(j,i) * ( &
[978]	217	kmxm * ( w(k,j,i) - w(k,j,i-1) ) * ddx &
	218	+ kmxm * ( u(k+1,j,i) - u(k,j,i) ) * ddzu(k+1) &
[1]	219	) &
[56]	220	+ wall_w_x(j,i) * wsus(k,j,i) &
[1]	221	) * ddx &
	222	+ ( fwyp(j,i) * ( &
[978]	223	kmyp * ( w(k,j+1,i) - w(k,j,i) ) * ddy &
	224	+ kmyp * ( v(k+1,j+1,i) - v(k,j+1,i) ) * ddzu(k+1) &
[1]	225	) &
	226	- fwym(j,i) * ( &
[978]	227	kmym * ( w(k,j,i) - w(k,j-1,i) ) * ddy &
	228	+ kmym * ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
[1]	229	) &
[56]	230	+ wall_w_y(j,i) * wsvs(k,j,i) &
[1]	231	) * ddy &
[1340]	232	+ 2.0_wp * ( &
[1]	233	km(k+1,j,i) * ( w(k+1,j,i) - w(k,j,i) ) * ddzw(k+1) &
[2037]	234	* rho_air(k+1) &
[1]	235	- km(k,j,i) * ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) &
[2037]	236	* rho_air(k) &
	237	) * ddzu(k+1) * drho_air_zw(k)
[1]	238	ENDDO
	239	ENDIF
	240
	241	ENDDO
	242	ENDDO
	243
	244	END SUBROUTINE diffusion_w
	245
	246
	247	!------------------------------------------------------------------------------!
[1682]	248	! Description:
	249	! ------------
	250	!> Call for all grid points - accelerator version
[1015]	251	!------------------------------------------------------------------------------!
	252	SUBROUTINE diffusion_w_acc
	253
[1320]	254	USE arrays_3d, &
[2037]	255	ONLY : ddzu, ddzw, km, tend, u, v, w, drho_air_zw, rho_air
[1320]	256
	257	USE control_parameters, &
	258	ONLY : topography
	259
	260	USE grid_variables, &
	261	ONLY : ddx, ddy, fwxm, fwxp, fwym, fwyp, wall_w_x, wall_w_y
	262
	263	USE indices, &
	264	ONLY : i_left, i_right, j_north, j_south, nxl, nxr, nyn, nys, nzb, &
	265	nzb_w_inner, nzb_w_outer, nzt
	266
	267	USE kinds
[1015]	268
	269	IMPLICIT NONE
	270
[1682]	271	INTEGER(iwp) :: i !<
	272	INTEGER(iwp) :: j !<
	273	INTEGER(iwp) :: k !<
[1320]	274
[1682]	275	REAL(wp) :: kmxm !<
	276	REAL(wp) :: kmxp !<
	277	REAL(wp) :: kmym !<
	278	REAL(wp) :: kmyp !<
[1015]	279
[1682]	280	REAL(wp), DIMENSION(nzb:nzt+1,nys:nyn,nxl:nxr) :: wsus !<
	281	REAL(wp), DIMENSION(nzb:nzt+1,nys:nyn,nxl:nxr) :: wsvs !<
[1015]	282	!$acc declare create ( wsus, wsvs )
	283
	284	!
	285	!-- First calculate horizontal momentum flux w'u' and/or w'v' at vertical
	286	!-- walls, if neccessary
	287	IF ( topography /= 'flat' ) THEN
[1320]	288	CALL wall_fluxes_acc( wsus, 0.0_wp, 0.0_wp, 0.0_wp, 1.0_wp, &
	289	nzb_w_inner, nzb_w_outer, wall_w_x )
	290	CALL wall_fluxes_acc( wsvs, 0.0_wp, 0.0_wp, 0.0_wp, 1.0_wp, &
	291	nzb_w_inner, nzb_w_outer, wall_w_y )
[1015]	292	ENDIF
	293
[1374]	294	!$acc kernels present ( u, v, w, km, tend ) &
[1015]	295	!$acc present ( ddzu, ddzw, fwxm, fwxp, fwym, fwyp, wall_w_x, wall_w_y ) &
	296	!$acc present ( nzb_w_inner, nzb_w_outer )
[1128]	297	DO i = i_left, i_right
	298	DO j = j_south, j_north
[1015]	299	DO k = 1, nzt
	300	IF ( k > nzb_w_outer(j,i) ) THEN
	301	!
	302	!-- Interpolate eddy diffusivities on staggered gridpoints
[1322]	303	kmxp = 0.25_wp * &
[1015]	304	( km(k,j,i)+km(k,j,i+1)+km(k+1,j,i)+km(k+1,j,i+1) )
[1322]	305	kmxm = 0.25_wp * &
[1015]	306	( km(k,j,i)+km(k,j,i-1)+km(k+1,j,i)+km(k+1,j,i-1) )
[1322]	307	kmyp = 0.25_wp * &
[1015]	308	( km(k,j,i)+km(k+1,j,i)+km(k,j+1,i)+km(k+1,j+1,i) )
[1322]	309	kmym = 0.25_wp * &
[1015]	310	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
	311
	312	tend(k,j,i) = tend(k,j,i) &
	313	& + ( kmxp * ( w(k,j,i+1) - w(k,j,i) ) * ddx &
	314	& + kmxp * ( u(k+1,j,i+1) - u(k,j,i+1) ) * ddzu(k+1) &
	315	& - kmxm * ( w(k,j,i) - w(k,j,i-1) ) * ddx &
	316	& - kmxm * ( u(k+1,j,i) - u(k,j,i) ) * ddzu(k+1) &
	317	& ) * ddx &
	318	& + ( kmyp * ( w(k,j+1,i) - w(k,j,i) ) * ddy &
	319	& + kmyp * ( v(k+1,j+1,i) - v(k,j+1,i) ) * ddzu(k+1) &
	320	& - kmym * ( w(k,j,i) - w(k,j-1,i) ) * ddy &
	321	& - kmym * ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
	322	& ) * ddy &
[1322]	323	& + 2.0_wp * ( &
[1015]	324	& km(k+1,j,i) * ( w(k+1,j,i) - w(k,j,i) ) * ddzw(k+1) &
[2037]	325	& * rho_air(k+1) &
[1015]	326	& - km(k,j,i) * ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) &
[2037]	327	& * rho_air(k) &
	328	& ) * ddzu(k+1) * drho_air_zw(k)
[1015]	329	ENDIF
	330	ENDDO
	331
	332	!
	333	!-- Wall functions at all vertical walls, where necessary
	334	DO k = 1,nzt
	335
	336	IF ( k > nzb_w_inner(j,i) .AND. k <= nzb_w_outer(j,i) .AND. &
[1340]	337	wall_w_x(j,i) /= 0.0_wp .AND. wall_w_y(j,i) /= 0.0_wp ) THEN
[1015]	338	!
	339	!-- Interpolate eddy diffusivities on staggered gridpoints
[1322]	340	kmxp = 0.25_wp * &
[1015]	341	( km(k,j,i)+km(k,j,i+1)+km(k+1,j,i)+km(k+1,j,i+1) )
[1322]	342	kmxm = 0.25_wp * &
[1015]	343	( km(k,j,i)+km(k,j,i-1)+km(k+1,j,i)+km(k+1,j,i-1) )
[1322]	344	kmyp = 0.25_wp * &
[1015]	345	( km(k,j,i)+km(k+1,j,i)+km(k,j+1,i)+km(k+1,j+1,i) )
[1322]	346	kmym = 0.25_wp * &
[1015]	347	( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
	348
	349	tend(k,j,i) = tend(k,j,i) &
	350	+ ( fwxp(j,i) * ( &
	351	kmxp * ( w(k,j,i+1) - w(k,j,i) ) * ddx &
	352	+ kmxp * ( u(k+1,j,i+1) - u(k,j,i+1) ) * ddzu(k+1) &
	353	) &
	354	- fwxm(j,i) * ( &
	355	kmxm * ( w(k,j,i) - w(k,j,i-1) ) * ddx &
	356	+ kmxm * ( u(k+1,j,i) - u(k,j,i) ) * ddzu(k+1) &
	357	) &
	358	+ wall_w_x(j,i) * wsus(k,j,i) &
	359	) * ddx &
	360	+ ( fwyp(j,i) * ( &
	361	kmyp * ( w(k,j+1,i) - w(k,j,i) ) * ddy &
	362	+ kmyp * ( v(k+1,j+1,i) - v(k,j+1,i) ) * ddzu(k+1) &
	363	) &
	364	- fwym(j,i) * ( &
	365	kmym * ( w(k,j,i) - w(k,j-1,i) ) * ddy &
	366	+ kmym * ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
	367	) &
	368	+ wall_w_y(j,i) * wsvs(k,j,i) &
	369	) * ddy &
[1340]	370	+ 2.0_wp * ( &
[1015]	371	km(k+1,j,i) * ( w(k+1,j,i) - w(k,j,i) ) * ddzw(k+1) &
[2037]	372	* rho_air(k+1) &
[1015]	373	- km(k,j,i) * ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) &
[2037]	374	* rho_air(k) &
	375	) * ddzu(k+1) * drho_air_zw(k)
[1015]	376	ENDIF
	377	ENDDO
	378
	379	ENDDO
	380	ENDDO
	381	!$acc end kernels
	382
	383	END SUBROUTINE diffusion_w_acc
	384
	385
	386	!------------------------------------------------------------------------------!
[1682]	387	! Description:
	388	! ------------
	389	!> Call for grid point i,j
[1]	390	!------------------------------------------------------------------------------!
[1001]	391	SUBROUTINE diffusion_w_ij( i, j )
[1]	392
[1320]	393	USE arrays_3d, &
[2037]	394	ONLY : ddzu, ddzw, km, tend, u, v, w, drho_air_zw, rho_air
[1320]	395
	396	USE control_parameters, &
	397	ONLY : topography
	398
	399	USE grid_variables, &
	400	ONLY : ddx, ddy, fwxm, fwxp, fwym, fwyp, wall_w_x, wall_w_y
	401
	402	USE indices, &
	403	ONLY : nxl, nxr, nyn, nys, nzb, nzb_w_inner, nzb_w_outer, nzt
	404
	405	USE kinds
[1]	406
	407	IMPLICIT NONE
	408
[1682]	409	INTEGER(iwp) :: i !<
	410	INTEGER(iwp) :: j !<
	411	INTEGER(iwp) :: k !<
[1320]	412
[1682]	413	REAL(wp) :: kmxm !<
	414	REAL(wp) :: kmxp !<
	415	REAL(wp) :: kmym !<
	416	REAL(wp) :: kmyp !<
[1]	417
[1320]	418	REAL(wp), DIMENSION(nzb:nzt+1) :: wsus
	419	REAL(wp), DIMENSION(nzb:nzt+1) :: wsvs
[1]	420
[1001]	421
[1]	422	DO k = nzb_w_outer(j,i)+1, nzt-1
	423	!
	424	!-- Interpolate eddy diffusivities on staggered gridpoints
[1322]	425	kmxp = 0.25_wp * ( km(k,j,i)+km(k,j,i+1)+km(k+1,j,i)+km(k+1,j,i+1) )
	426	kmxm = 0.25_wp * ( km(k,j,i)+km(k,j,i-1)+km(k+1,j,i)+km(k+1,j,i-1) )
	427	kmyp = 0.25_wp * ( km(k,j,i)+km(k+1,j,i)+km(k,j+1,i)+km(k+1,j+1,i) )
	428	kmym = 0.25_wp * ( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
[1]	429
	430	tend(k,j,i) = tend(k,j,i) &
[978]	431	& + ( kmxp * ( w(k,j,i+1) - w(k,j,i) ) * ddx &
	432	& + kmxp * ( u(k+1,j,i+1) - u(k,j,i+1) ) * ddzu(k+1) &
	433	& - kmxm * ( w(k,j,i) - w(k,j,i-1) ) * ddx &
	434	& - kmxm * ( u(k+1,j,i) - u(k,j,i) ) * ddzu(k+1) &
[1]	435	& ) * ddx &
[978]	436	& + ( kmyp * ( w(k,j+1,i) - w(k,j,i) ) * ddy &
	437	& + kmyp * ( v(k+1,j+1,i) - v(k,j+1,i) ) * ddzu(k+1) &
	438	& - kmym * ( w(k,j,i) - w(k,j-1,i) ) * ddy &
	439	& - kmym * ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
[1]	440	& ) * ddy &
[1322]	441	& + 2.0_wp * ( &
[1]	442	& km(k+1,j,i) * ( w(k+1,j,i) - w(k,j,i) ) * ddzw(k+1) &
[2037]	443	& * rho_air(k+1) &
[1]	444	& - km(k,j,i) * ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) &
[2037]	445	& * rho_air(k) &
	446	& ) * ddzu(k+1) * drho_air_zw(k)
[1]	447	ENDDO
	448
	449	!
	450	!-- Wall functions at all vertical walls, where necessary
[1340]	451	IF ( wall_w_x(j,i) /= 0.0_wp .OR. wall_w_y(j,i) /= 0.0_wp ) THEN
[51]	452
	453	!
	454	!-- Calculate the horizontal momentum fluxes w'u' and/or w'v'
[1340]	455	IF ( wall_w_x(j,i) /= 0.0_wp ) THEN
[1320]	456	CALL wall_fluxes( i, j, nzb_w_inner(j,i)+1, nzb_w_outer(j,i), &
	457	wsus, 0.0_wp, 0.0_wp, 0.0_wp, 1.0_wp )
[51]	458	ELSE
[1340]	459	wsus = 0.0_wp
[51]	460	ENDIF
	461
[1340]	462	IF ( wall_w_y(j,i) /= 0.0_wp ) THEN
[1320]	463	CALL wall_fluxes( i, j, nzb_w_inner(j,i)+1, nzb_w_outer(j,i), &
	464	wsvs, 0.0_wp, 0.0_wp, 1.0_wp, 0.0_wp )
[51]	465	ELSE
[1340]	466	wsvs = 0.0_wp
[51]	467	ENDIF
	468
[1]	469	DO k = nzb_w_inner(j,i)+1, nzb_w_outer(j,i)
	470	!
	471	!-- Interpolate eddy diffusivities on staggered gridpoints
[1322]	472	kmxp = 0.25_wp * ( km(k,j,i)+km(k,j,i+1)+km(k+1,j,i)+km(k+1,j,i+1) )
	473	kmxm = 0.25_wp * ( km(k,j,i)+km(k,j,i-1)+km(k+1,j,i)+km(k+1,j,i-1) )
	474	kmyp = 0.25_wp * ( km(k,j,i)+km(k+1,j,i)+km(k,j+1,i)+km(k+1,j+1,i) )
	475	kmym = 0.25_wp * ( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )
[1]	476
	477	tend(k,j,i) = tend(k,j,i) &
	478	+ ( fwxp(j,i) * ( &
[978]	479	kmxp * ( w(k,j,i+1) - w(k,j,i) ) * ddx &
	480	+ kmxp * ( u(k+1,j,i+1) - u(k,j,i+1) ) * ddzu(k+1) &
[1]	481	) &
	482	- fwxm(j,i) * ( &
[978]	483	kmxm * ( w(k,j,i) - w(k,j,i-1) ) * ddx &
	484	+ kmxm * ( u(k+1,j,i) - u(k,j,i) ) * ddzu(k+1) &
[1]	485	) &
[51]	486	+ wall_w_x(j,i) * wsus(k) &
[1]	487	) * ddx &
	488	+ ( fwyp(j,i) * ( &
[978]	489	kmyp * ( w(k,j+1,i) - w(k,j,i) ) * ddy &
	490	+ kmyp * ( v(k+1,j+1,i) - v(k,j+1,i) ) * ddzu(k+1) &
[1]	491	) &
	492	- fwym(j,i) * ( &
[978]	493	kmym * ( w(k,j,i) - w(k,j-1,i) ) * ddy &
	494	+ kmym * ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &
[1]	495	) &
[51]	496	+ wall_w_y(j,i) * wsvs(k) &
[1]	497	) * ddy &
[1340]	498	+ 2.0_wp * ( &
[1]	499	km(k+1,j,i) * ( w(k+1,j,i) - w(k,j,i) ) * ddzw(k+1) &
[2037]	500	* rho_air(k+1) &
[1]	501	- km(k,j,i) * ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) &
[2037]	502	* rho_air(k) &
	503	) * ddzu(k+1) * drho_air_zw(k)
[1]	504	ENDDO
	505	ENDIF
	506
	507	END SUBROUTINE diffusion_w_ij
	508
[1323]	509	END MODULE diffusion_w_mod

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