pkg/mom_common/mom_v_sidedrag.F

C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_v_sidedrag.F,v 1.4 2004/11/02 23:57:29 dimitri Exp $
C $Name:  $

#include "MOM_COMMON_OPTIONS.h"

CBOP
C !ROUTINE: MOM_V_SIDEDRAG

C !INTERFACE: ==========================================================
      SUBROUTINE MOM_V_SIDEDRAG(
     I        bi,bj,k,
     I        vFld, del2v, hFacZ,
     I        viscAh_Z,viscA4_Z,
     I        harmonic,biharmonic,useVariableViscosity,
     O        vDragTerms,
     I        myThid)

C !DESCRIPTION:
C Calculates the drag terms due to the no-slip condition on viscous stresses:
C \begin{equation*}
C G^v_{drag} = - \frac{2}{\Delta x_v} (A_h v - A_4 \nabla^2 v)
C \end{equation*}

C !USES: ===============================================================
      IMPLICIT NONE
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "GRID.h"

C !INPUT PARAMETERS: ===================================================
C  bi,bj                :: tile indices
C  k                    :: vertical level
C  uvld                 :: meridional flow
C  del2v                :: Laplacian of meridional flow
C  hFacZ                :: fractional open water at vorticity points
C  myThid               :: thread number
      INTEGER bi,bj,k
      _RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL del2v(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RS hFacZ(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL viscAh_Z(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL viscA4_Z(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      LOGICAL harmonic,biharmonic,useVariableViscosity
      INTEGER myThid

C !OUTPUT PARAMETERS: ==================================================
C  vDragTerms           :: drag term
      _RL vDragTerms(1-OLx:sNx+OLx,1-OLy:sNy+OLy)

C !LOCAL VARIABLES: ====================================================
C  i,j                  :: loop indices
C  hFacZClosedE         :: fractional open water to east
C  hFacZClosedW         :: fractional open water to west
      INTEGER I,J
      _RS hFacZClosedE,hFacZClosedW
CEOP

C     - Laplacian  and bi-harmonic terms
      DO j=1-Oly,sNy+Oly-1
       DO i=1-Olx,sNx+Olx-1
        hFacZClosedW = _hFacS(i,j,k,bi,bj) - hFacZ(i,j)
        hFacZClosedE = _hFacS(i,j,k,bi,bj) - hFacZ(i+1,j)
        vDragTerms(i,j) =
     &   -_recip_hFacS(i,j,k,bi,bj)
     &   *recip_drF(k)*recip_rAs(i,j,bi,bj)
     &   *( hFacZClosedW*_dyU( i ,j,bi,bj)*_recip_dxV( i ,j,bi,bj)
#ifdef ISOTROPIC_COS_SCALING
     &         *(viscAh_Z(i  ,j)*vFld(i,j)*cosFacV(J,bi,bj)
#ifdef COSINEMETH_III
     &           -viscA4_Z(i  ,j)*del2v(i,j)*sqcosFacV(J,bi,bj))
#else 
     &           -viscA4_Z(i  ,j)*del2v(i,j)*cosFacV(J,bi,bj))
#endif
#else
     &         *(viscAh_Z(i  ,j)*vFld(i,j)
     &           -viscA4_Z(i  ,j)*del2v(i,j))
#endif
     &     +hFacZClosedE*_dyU(i+1,j,bi,bj)*_recip_dxV(i+1,j,bi,bj) 
#ifdef ISOTROPIC_COS_SCALING
     &         *(viscAh_Z(i+1,j)*vFld(i,j)*cosFacV(J,bi,bj)
#ifdef COSINEMETH_III
     &           -viscA4_Z(i+1,j)*del2v(i,j)*sqcosFacV(J,bi,bj))
#else
     &           -viscA4_Z(i+1,j)*del2v(i,j)*cosFacV(J,bi,bj))
#endif
#else
     &         *(viscAh_Z(i+1,j)*vFld(i,j)
     &           -viscA4_Z(i+1,j)*del2v(i,j))
#endif
     &              )
     &   *drF(k)*2.
       ENDDO
      ENDDO

      RETURN
      END

1	baylor	1.5	C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_v_sidedrag.F,v 1.4 2004/11/02 23:57:29 dimitri Exp $
2	adcroft	1.2	C $Name: $
3	adcroft	1.1
4			#include "MOM_COMMON_OPTIONS.h"
5
6			CBOP
7			C !ROUTINE: MOM_V_SIDEDRAG
8
9			C !INTERFACE: ==========================================================
10			SUBROUTINE MOM_V_SIDEDRAG(
11			I bi,bj,k,
12			I vFld, del2v, hFacZ,
13	baylor	1.5	I viscAh_Z,viscA4_Z,
14			I harmonic,biharmonic,useVariableViscosity,
15	adcroft	1.1	O vDragTerms,
16			I myThid)
17
18			C !DESCRIPTION:
19			C Calculates the drag terms due to the no-slip condition on viscous stresses:
20			C \begin{equation*}
21			C G^v_{drag} = - \frac{2}{\Delta x_v} (A_h v - A_4 \nabla^2 v)
22			C \end{equation*}
23
24			C !USES: ===============================================================
25			IMPLICIT NONE
26			#include "SIZE.h"
27			#include "EEPARAMS.h"
28			#include "PARAMS.h"
29			#include "GRID.h"
30
31			C !INPUT PARAMETERS: ===================================================
32			C bi,bj :: tile indices
33			C k :: vertical level
34			C uvld :: meridional flow
35			C del2v :: Laplacian of meridional flow
36			C hFacZ :: fractional open water at vorticity points
37			C myThid :: thread number
38			INTEGER bi,bj,k
39			_RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
40			_RL del2v(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
41			_RS hFacZ(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
42	baylor	1.5	_RL viscAh_Z(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
43			_RL viscA4_Z(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
44			LOGICAL harmonic,biharmonic,useVariableViscosity
45	adcroft	1.1	INTEGER myThid
46
47			C !OUTPUT PARAMETERS: ==================================================
48			C vDragTerms :: drag term
49			_RL vDragTerms(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
50
51			C !LOCAL VARIABLES: ====================================================
52			C i,j :: loop indices
53			C hFacZClosedE :: fractional open water to east
54			C hFacZClosedW :: fractional open water to west
55			INTEGER I,J
56			_RS hFacZClosedE,hFacZClosedW
57			CEOP
58
59			C - Laplacian and bi-harmonic terms
60			DO j=1-Oly,sNy+Oly-1
61			DO i=1-Olx,sNx+Olx-1
62			hFacZClosedW = _hFacS(i,j,k,bi,bj) - hFacZ(i,j)
63			hFacZClosedE = _hFacS(i,j,k,bi,bj) - hFacZ(i+1,j)
64			vDragTerms(i,j) =
65			& -_recip_hFacS(i,j,k,bi,bj)
66			& recip_drF(k)recip_rAs(i,j,bi,bj)
67	baylor	1.5	& ( hFacZClosedW_dyU( i ,j,bi,bj)*_recip_dxV( i ,j,bi,bj)
68			#ifdef ISOTROPIC_COS_SCALING
69			& (viscAh_Z(i ,j)vFld(i,j)*cosFacV(J,bi,bj)
70	adcroft	1.1	#ifdef COSINEMETH_III
71	baylor	1.5	& -viscA4_Z(i ,j)del2v(i,j)sqcosFacV(J,bi,bj))
72			#else
73			& -viscA4_Z(i ,j)del2v(i,j)cosFacV(J,bi,bj))
74			#endif
75			#else
76			& (viscAh_Z(i ,j)vFld(i,j)
77			& -viscA4_Z(i ,j)*del2v(i,j))
78			#endif
79			& +hFacZClosedE_dyU(i+1,j,bi,bj)_recip_dxV(i+1,j,bi,bj)
80			#ifdef ISOTROPIC_COS_SCALING
81			& (viscAh_Z(i+1,j)vFld(i,j)*cosFacV(J,bi,bj)
82			#ifdef COSINEMETH_III
83			& -viscA4_Z(i+1,j)del2v(i,j)sqcosFacV(J,bi,bj))
84	adcroft	1.1	#else
85	baylor	1.5	& -viscA4_Z(i+1,j)del2v(i,j)cosFacV(J,bi,bj))
86			#endif
87			#else
88			& (viscAh_Z(i+1,j)vFld(i,j)
89			& -viscA4_Z(i+1,j)*del2v(i,j))
90	adcroft	1.1	#endif
91			& )
92	baylor	1.5	& drF(k)2.
93	adcroft	1.1	ENDDO
94			ENDDO
95
96			RETURN
97			END
98	baylor	1.5