natl_12/code/mom_u_xviscflux.F

C $Header: /u/u0/gcmpack/MITgcm/pkg/mom_fluxform/mom_u_xviscflux.F,v 1.3 2001/09/26 19:05:21 adcroft Exp $
C $Name:  $

#include "CPP_OPTIONS.h"

CBOP
C !ROUTINE: MOM_U_XVISCFLUX

C !INTERFACE: ==========================================================
      SUBROUTINE MOM_U_XVISCFLUX(
     I        bi,bj,k,
     I        uFld, del2u,
     O        xViscFluxU,
     I        myThid)

C !DESCRIPTION:
C Calculates the area integrated zonal viscous fluxes of U:
C \begin{equation*}
C F^x = - \frac{ \Delta y_f \Delta r_f h_c }{\Delta x_f} 
C  ( A_h \delta_i u - A_4 \delta_i \nabla^2 u )
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  uFld                 :: zonal flow
C  del2u                :: Laplacian of zonal flow
C  myThid               :: thread number
      INTEGER bi,bj,k
      _RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL del2u(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      INTEGER myThid

C !OUTPUT PARAMETERS: ==================================================
C  xViscFluxU           :: viscous fluxes
      _RL xViscFluxU(1-OLx:sNx+OLx,1-OLy:sNy+OLy)

C !LOCAL VARIABLES: ====================================================
C  i,j                  :: loop indices
      INTEGER I,J
      _RS gridScalingA4
CEOP

C     - Laplacian  and bi-harmonic terms
      DO j=1-Oly,sNy+Oly-1
       DO i=1-Olx,sNx+Olx-1
        gridScalingA4 = (_dxF(i,j,bi,bj)**4)/(5000.**4)
        xViscFluxU(i,j) =
     &    _dyF(i,j,bi,bj)*drF(k)*_hFacC(i,j,k,bi,bj)
     &     *(
     &       -viscAh*(uFld(i+1,j)-uFld(i,j))
     &       *cosFacU(J,bi,bj)
     &       +viscA4*(del2u(i+1,j)       -del2u(i,j)       )
     &              *gridScalingA4
#ifdef COSINEMETH_III
     &       *sqcosFacU(J,bi,bj)
#else
     &       *cosFacU(J,bi,bj)
#endif
     &      )*_recip_dxF(i,j,bi,bj)
       ENDDO
      ENDDO

      RETURN
      END
1	C $Header: /u/u0/gcmpack/MITgcm/pkg/mom_fluxform/mom_u_xviscflux.F,v 1.3 2001/09/26 19:05:21 adcroft Exp $
2	C $Name: $
3
4	#include "CPP_OPTIONS.h"
5
6	CBOP
7	C !ROUTINE: MOM_U_XVISCFLUX
8
9	C !INTERFACE: ==========================================================
10	SUBROUTINE MOM_U_XVISCFLUX(
11	I bi,bj,k,
12	I uFld, del2u,
13	O xViscFluxU,
14	I myThid)
15
16	C !DESCRIPTION:
17	C Calculates the area integrated zonal viscous fluxes of U:
18	C \begin{equation*}
19	C F^x = - \frac{ \Delta y_f \Delta r_f h_c }{\Delta x_f}
20	C ( A_h \delta_i u - A_4 \delta_i \nabla^2 u )
21	C \end{equation*}
22
23	C !USES: ===============================================================
24	IMPLICIT NONE
25	#include "SIZE.h"
26	#include "EEPARAMS.h"
27	#include "PARAMS.h"
28	#include "GRID.h"
29
30	C !INPUT PARAMETERS: ===================================================
31	C bi,bj :: tile indices
32	C k :: vertical level
33	C uFld :: zonal flow
34	C del2u :: Laplacian of zonal flow
35	C myThid :: thread number
36	INTEGER bi,bj,k
37	_RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
38	_RL del2u(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
39	INTEGER myThid
40
41	C !OUTPUT PARAMETERS: ==================================================
42	C xViscFluxU :: viscous fluxes
43	_RL xViscFluxU(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
44
45	C !LOCAL VARIABLES: ====================================================
46	C i,j :: loop indices
47	INTEGER I,J
48	_RS gridScalingA4
49	CEOP
50
51	C - Laplacian and bi-harmonic terms
52	DO j=1-Oly,sNy+Oly-1
53	DO i=1-Olx,sNx+Olx-1
54	gridScalingA4 = (_dxF(i,j,bi,bj)4)/(5000.4)
55	xViscFluxU(i,j) =
56	& _dyF(i,j,bi,bj)drF(k)_hFacC(i,j,k,bi,bj)
57	& *(
58	& -viscAh*(uFld(i+1,j)-uFld(i,j))
59	& *cosFacU(J,bi,bj)
60	& +viscA4*(del2u(i+1,j) -del2u(i,j) )
61	& *gridScalingA4
62	#ifdef COSINEMETH_III
63	& *sqcosFacU(J,bi,bj)
64	#else
65	& *cosFacU(J,bi,bj)
66	#endif
67	& )*_recip_dxF(i,j,bi,bj)
68	ENDDO
69	ENDDO
70
71	RETURN
72	END