pkg/mom_fluxform/mom_v_sidedrag.F

C $Header: /u/gcmpack/MITgcm/pkg/mom_fluxform/mom_v_sidedrag.F,v 1.4 2003/10/09 04:19:20 edhill Exp $
C $Name:  $

#include "MOM_FLUXFORM_OPTIONS.h"

CBOP
C !ROUTINE: MOM_V_SIDEDRAG

C !INTERFACE: ==========================================================
      SUBROUTINE MOM_V_SIDEDRAG(
     I        bi,bj,k,
     I        vFld, del2v, hFacZ,
     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)
      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)
     &     +hFacZClosedE*_dyU(i+1,j,bi,bj)
     &      *_recip_dxV(i+1,j,bi,bj) )
     &   *drF(k)*2.*(
     &                viscAh*vFld(i,j)*cosFacV(J,bi,bj)
     &               -viscA4*del2v(i,j)*cosFacV(J,bi,bj)
#ifdef COSINEMETH_III
     &               -viscA4*del2v(i,j)*sqcosFacV(J,bi,bj)
#else
     &               -viscA4*del2v(i,j)*cosFacV(J,bi,bj)
#endif
     &              )
       ENDDO
      ENDDO

      RETURN
      END
1	C $Header: /u/gcmpack/MITgcm/pkg/mom_fluxform/mom_v_sidedrag.F,v 1.4 2003/10/09 04:19:20 edhill Exp $
2	C $Name: $
3
4	#include "MOM_FLUXFORM_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	O vDragTerms,
14	I myThid)
15
16	C !DESCRIPTION:
17	C Calculates the drag terms due to the no-slip condition on viscous stresses:
18	C \begin{equation*}
19	C G^v_{drag} = - \frac{2}{\Delta x_v} (A_h v - A_4 \nabla^2 v)
20	C \end{equation*}
21
22	C !USES: ===============================================================
23	IMPLICIT NONE
24	#include "SIZE.h"
25	#include "EEPARAMS.h"
26	#include "PARAMS.h"
27	#include "GRID.h"
28
29	C !INPUT PARAMETERS: ===================================================
30	C bi,bj :: tile indices
31	C k :: vertical level
32	C uvld :: meridional flow
33	C del2v :: Laplacian of meridional flow
34	C hFacZ :: fractional open water at vorticity points
35	C myThid :: thread number
36	INTEGER bi,bj,k
37	_RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
38	_RL del2v(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
39	_RS hFacZ(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
40	INTEGER myThid
41
42	C !OUTPUT PARAMETERS: ==================================================
43	C vDragTerms :: drag term
44	_RL vDragTerms(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
45
46	C !LOCAL VARIABLES: ====================================================
47	C i,j :: loop indices
48	C hFacZClosedE :: fractional open water to east
49	C hFacZClosedW :: fractional open water to west
50	INTEGER I,J
51	_RS hFacZClosedE,hFacZClosedW
52	CEOP
53
54	C - Laplacian and bi-harmonic terms
55	DO j=1-Oly,sNy+Oly-1
56	DO i=1-Olx,sNx+Olx-1
57	hFacZClosedW = _hFacS(i,j,k,bi,bj) - hFacZ(i,j)
58	hFacZClosedE = _hFacS(i,j,k,bi,bj) - hFacZ(i+1,j)
59	vDragTerms(i,j) =
60	& -_recip_hFacS(i,j,k,bi,bj)
61	& recip_drF(k)recip_rAs(i,j,bi,bj)
62	& ( hFacZClosedW_dyU( i ,j,bi,bj)
63	& *_recip_dxV( i ,j,bi,bj)
64	& +hFacZClosedE*_dyU(i+1,j,bi,bj)
65	& *_recip_dxV(i+1,j,bi,bj) )
66	& drF(k)2.*(
67	& viscAhvFld(i,j)cosFacV(J,bi,bj)
68	& -viscA4del2v(i,j)cosFacV(J,bi,bj)
69	#ifdef COSINEMETH_III
70	& -viscA4del2v(i,j)sqcosFacV(J,bi,bj)
71	#else
72	& -viscA4del2v(i,j)cosFacV(J,bi,bj)
73	#endif
74	& )
75	ENDDO
76	ENDDO
77
78	RETURN
79	END