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C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_u_sidedrag.F,v 1.12 2006/06/07 01:55:15 heimbach Exp $ |
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C $Name: $ |
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|
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#include "MOM_COMMON_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: MOM_U_SIDEDRAG |
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|
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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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I viscAh_Z, viscA4_Z, |
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I harmonic, biharmonic, useVariableViscosity, |
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O uDragTerms, |
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I myThid ) |
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|
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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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|
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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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#include "SURFACE.h" |
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|
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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 :: my Thread Id 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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_RL viscAh_Z(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL viscA4_Z(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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LOGICAL harmonic, biharmonic, useVariableViscosity |
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INTEGER myThid |
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|
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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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|
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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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_RL hFacZClosedS, hFacZClosedN |
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_RL Ahtmp, A4tmp |
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CEOP |
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|
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IF ( sideDragFactor.LE.0. ) THEN |
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C-- Laplacian and bi-harmonic terms: variable-Viscosity coeff. from |
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C MOM_CALC_VISC are not used here (corresponds to the "old" version). |
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|
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DO j=2-OLy,sNy+OLy-1 |
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DO i=2-OLx,sNx+OLx-1 |
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#ifdef NONLIN_FRSURF |
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hFacZClosedS = h0FacW(i,j,k,bi,bj) - hFacZ(i,j) |
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hFacZClosedN = h0FacW(i,j,k,bi,bj) - hFacZ(i,j+1) |
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#else |
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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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#endif |
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Ahtmp=MIN(viscAh+viscAhGrid*rAw(i,j,bi,bj)/deltaTmom, |
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& viscAhMax) |
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A4tmp=MIN(viscA4+viscA4Grid*(rAw(i,j,bi,bj)**2)/deltaTmom, |
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& viscA4Max) |
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A4tmp=MIN(A4tmp,viscA4GridMax*(rAw(i,j,bi,bj)**2)/deltaTmom) |
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A4tmp=MAX(A4tmp,viscA4GridMin*(rAw(i,j,bi,bj)**2)/deltaTmom) |
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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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& Ahtmp*uFld(i,j) |
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& -A4tmp*del2u(i,j) |
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#endif |
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& ) |
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ENDDO |
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ENDDO |
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|
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ELSE |
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C-- Laplacian and bi-harmonic terms: using variable-Viscosity coeff. |
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C from MOM_CALC_VISC, consistent with dissipation in the interior |
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|
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DO j=2-OLy,sNy+OLy-1 |
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DO i=2-OLx,sNx+OLx-1 |
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#ifdef NONLIN_FRSURF |
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hFacZClosedS = h0FacW(i,j,k,bi,bj) - hFacZ(i,j) |
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hFacZClosedN = h0FacW(i,j,k,bi,bj) - hFacZ(i,j+1) |
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#else |
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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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#endif |
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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)*_recip_dyU(i, j ,bi,bj) |
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#ifdef ISOTROPIC_COS_SCALING |
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& *( viscAh_Z(i,j )*uFld(i,j)*cosFacU(j,bi,bj) |
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#ifdef COSINEMETH_III |
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& -viscA4_Z(i,j )*del2u(i,j)*sqcosFacU(j,bi,bj) ) |
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#else |
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& -viscA4_Z(i,j )*del2u(i,j)*cosFacU(j,bi,bj) ) |
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#endif |
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#else |
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& *( viscAh_Z(i,j )*uFld(i,j) |
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& -viscA4_Z(i,j )*del2u(i,j) ) |
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#endif |
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& +hFacZClosedN*_dxV(i,j+1,bi,bj)*_recip_dyU(i,j+1,bi,bj) |
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#ifdef ISOTROPIC_COS_SCALING |
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& *( viscAh_Z(i,j+1)*uFld(i,j)*cosFacU(j,bi,bj) |
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#ifdef COSINEMETH_III |
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& -viscA4_Z(i,j+1)*del2u(i,j)*sqcosFacU(j,bi,bj) ) |
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#else |
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& -viscA4_Z(i,j+1)*del2u(i,j)*cosFacU(j,bi,bj) ) |
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#endif |
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#else |
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& *( viscAh_Z(i,j+1)*uFld(i,j) |
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& -viscA4_Z(i,j+1)*del2u(i,j) ) |
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#endif |
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& )*drF(k)*sideDragFactor |
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ENDDO |
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ENDDO |
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|
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C-- end old-version / new-version IF blocks |
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ENDIF |
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|
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#ifdef ALLOW_DIAGNOSTICS |
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IF (useDiagnostics) THEN |
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CALL DIAGNOSTICS_FILL(uDragTerms,'USidDrag',k,1,2,bi,bj,myThid) |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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|
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RETURN |
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END |
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