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C $Header: /u/u0/gcmpack/MITgcm/pkg/mom_fluxform/mom_u_xviscflux.F,v 1.3 2001/09/26 19:05:21 adcroft Exp $ |
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C $Name: $ |
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#include "CPP_OPTIONS.h" |
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CBOP |
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C !ROUTINE: MOM_U_XVISCFLUX |
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C !INTERFACE: ========================================================== |
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SUBROUTINE MOM_U_XVISCFLUX( |
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I bi,bj,k, |
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I uFld, del2u, |
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O xViscFluxU, |
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I myThid) |
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C !DESCRIPTION: |
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C Calculates the area integrated zonal viscous fluxes of U: |
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C \begin{equation*} |
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C F^x = - \frac{ \Delta y_f \Delta r_f h_c }{\Delta x_f} |
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C ( A_h \delta_i u - A_4 \delta_i \nabla^2 u ) |
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C \end{equation*} |
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C !USES: =============================================================== |
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IMPLICIT NONE |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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C !INPUT PARAMETERS: =================================================== |
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C bi,bj :: tile indices |
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C k :: vertical level |
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C uFld :: zonal flow |
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C del2u :: Laplacian of zonal flow |
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C myThid :: thread number |
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INTEGER bi,bj,k |
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_RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL del2u(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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C !OUTPUT PARAMETERS: ================================================== |
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C xViscFluxU :: viscous fluxes |
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_RL xViscFluxU(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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C !LOCAL VARIABLES: ==================================================== |
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C i,j :: loop indices |
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INTEGER I,J |
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_RS gridScalingA4 |
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cnh |
1.2 |
_RS gridScalingAh |
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cnh |
1.1 |
CEOP |
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C - Laplacian and bi-harmonic terms |
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DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx,sNx+Olx-1 |
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gridScalingA4 = (_dxF(i,j,bi,bj)**4)/(5000.**4) |
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gridScalingAh = (_dxF(i,j,bi,bj)**2)/(5000.**2) |
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1.1 |
xViscFluxU(i,j) = |
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& _dyF(i,j,bi,bj)*drF(k)*_hFacC(i,j,k,bi,bj) |
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& *( |
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& -viscAh*(uFld(i+1,j)-uFld(i,j))*gridScalingAh |
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1.1 |
& *cosFacU(J,bi,bj) |
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& +viscA4*(del2u(i+1,j) -del2u(i,j) ) |
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& *gridScalingA4 |
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#ifdef COSINEMETH_III |
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& *sqcosFacU(J,bi,bj) |
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#else |
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& *cosFacU(J,bi,bj) |
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#endif |
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& )*_recip_dxF(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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RETURN |
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END |
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