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C $Header: /u/u0/gcmpack/MITgcm/pkg/mom_fluxform/mom_u_sidedrag.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_SIDEDRAG |
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C !INTERFACE: ========================================================== |
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SUBROUTINE MOM_U_SIDEDRAG( |
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I bi,bj,k, |
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I uFld, del2u, hFacZ, |
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O uDragTerms, |
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I myThid) |
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C !DESCRIPTION: |
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C Calculates the drag terms due to the no-slip condition on viscous stresses: |
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C \begin{equation*} |
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C G^u_{drag} = - \frac{2}{\Delta y_u} (A_h u - A_4 \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 hFacZ :: fractional open water at vorticity points |
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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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_RS hFacZ(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 uDragTerms :: drag term |
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_RL uDragTerms(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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C hFacZClosedN :: fractional open water to north |
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C hFacZClosedS :: fractional open water to south |
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INTEGER I,J |
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_RS hFacZClosedS,hFacZClosedN |
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cnh |
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_RS gridScalingAh |
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cnh |
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_RS gridScalingA4 |
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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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hFacZClosedS = _hFacW(i,j,k,bi,bj) - hFacZ(i,j) |
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hFacZClosedN = _hFacW(i,j,k,bi,bj) - hFacZ(i,j+1) |
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gridScalingA4 = (_dyU(i, j ,bi,bj)**4)/(5000.**4) ! Realy should split this loop for a more precise formulation |
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gridScalingAh = (_dyU(i, j ,bi,bj)**2)/(5000.**2) ! Realy should split this loop for a more precise formulation |
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uDragTerms(i,j) = |
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& -_recip_hFacW(i,j,k,bi,bj) |
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& *recip_drF(k)*recip_rAw(i,j,bi,bj) |
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& *( hFacZClosedS*_dxV(i, j ,bi,bj) |
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& *_recip_dyU(i, j ,bi,bj) |
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& +hFacZClosedN*_dxV(i,j+1,bi,bj) |
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& *_recip_dyU(i,j+1,bi,bj) ) |
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& *drF(k)*2.*( |
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#ifdef ISOTROPIC_COS_SCALING |
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& viscAh*uFld(i,j)*cosFacU(J,bi,bj) |
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#ifdef COSINEMETH_III |
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& -viscA4*del2u(i,j)*sqcosFacU(J,bi,bj) |
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#else |
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& -viscA4*del2u(i,j)*cosFacU(J,bi,bj) |
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#endif |
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#else |
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& viscAh*uFld(i,j)*gridScalingAh |
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& -viscA4*del2u(i,j)*gridScalingA4 |
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#endif |
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& ) |
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ENDDO |
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ENDDO |
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RETURN |
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END |
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