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jmc |
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C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_v_sidedrag.F,v 1.12 2006/06/07 01:55:15 heimbach Exp $ |
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C $Name: $ |
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#include "MOM_COMMON_OPTIONS.h" |
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CBOP |
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C !ROUTINE: MOM_W_SIDEDRAG |
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C !INTERFACE: ========================================================== |
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SUBROUTINE MOM_W_SIDEDRAG( |
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I bi,bj,k, |
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I wFld, del2w, |
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I rThickC, recip_rThickC, |
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I viscAh_W, viscA4_W, |
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O gwSideDrag, |
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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^w_{drag} = - \frac{2}{\Delta x_w} (A_h w - A_4 \nabla^2 w) |
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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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#include "SURFACE.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 wFld :: vertical velocity |
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C del2w :: Laplacian of vertical velocity |
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C rThickC :: thickness of W-cell |
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C recip_rThickC :: reciprol of W-cell thickness |
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C viscAh_W :: harmonic horizontal viscosity (at W-Cell center) |
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C viscA4_W :: biharmonic horizontal viscosity (at W-Cell center) |
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C myThid :: my Thread Id number |
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INTEGER bi,bj,k |
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_RL wFld (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL del2w (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL rThickC (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL recip_rThickC(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL viscAh_W(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL viscA4_W(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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INTEGER myThid |
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C !OUTPUT PARAMETERS: ================================================== |
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C gwSideDrag :: side drag tendency |
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_RL gwSideDrag(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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#ifdef ALLOW_NONHYDROSTATIC |
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C !LOCAL VARIABLES: ==================================================== |
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C i,j :: loop indices |
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C heightStepW :: height of topographic step to West |
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C heightStepE :: height of topographic step to East |
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C heightStepS :: height of topographic step to South |
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C heightStepN :: height of topographic step to North |
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INTEGER i,j |
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_RL heightStepW, heightStepE |
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_RL heightStepS, heightStepN |
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CEOP |
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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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DO j=2-Oly,sNy+Oly-1 |
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DO i=2-Olx,sNx+Olx-1 |
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C- this will not give any side-drag along thin wall. |
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C (but this might just be what we want ...) |
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heightStepW = MAX( 0. _d 0, rThickC(i,j) - rThickC(i-1,j) ) |
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heightStepE = MAX( 0. _d 0, rThickC(i,j) - rThickC(i+1,j) ) |
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heightStepS = MAX( 0. _d 0, rThickC(i,j) - rThickC(i,j-1) ) |
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heightStepN = MAX( 0. _d 0, rThickC(i,j) - rThickC(i,j+1) ) |
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C- jmc: take directly viscAh_W & viscA4_W (no bar_i, bar_j) since |
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C they are already at the center (and not above u,v point). |
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gwSideDrag(i,j) = |
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& -sideDragFactor |
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& *( heightStepW*_dyG( i ,j,bi,bj)*_recip_dxC( i ,j,bi,bj) |
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& *( viscAh_W(i,j,k,bi,bj)*wFld(i,j,k,bi,bj) |
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& *cosFacV(j,bi,bj) |
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& -viscA4_W(i,j,k,bi,bj)*del2w(i,j) |
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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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& ) |
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& +heightStepE*_dyG(i+1,j,bi,bj)*_recip_dxC(i+1,j,bi,bj) |
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& *( viscAh_W(i,j,k,bi,bj)*wFld(i,j,k,bi,bj) |
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& *cosFacV(j,bi,bj) |
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& -viscA4_W(i,j,k,bi,bj)*del2w(i,j) |
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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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& ) |
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& +heightStepS*_dxG(i,j,bi,bj)*_recip_dyC(i,j,bi,bj) |
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& *( viscAh_W(i,j,k,bi,bj)*wFld(i,j,k,bi,bj) |
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#ifdef ISOTROPIC_COS_SCALING |
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& *cosFacV(j,bi,bj) |
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#endif |
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& -viscA4_W(i,j,k,bi,bj)*del2w(i,j) |
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#ifdef ISOTROPIC_COS_SCALING |
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# ifdef COSINEMETH_III |
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& *sqCosFacV(j,bi,bj) |
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# else |
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& *cosFacV(j,bi,bj) |
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# endif |
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#endif |
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& ) |
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& +heightStepN*_dxG(i,j+1,bi,bj)*_recip_dyC(i,j+1,bi,bj) |
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& *( viscAh_W(i,j,k,bi,bj)*wFld(i,j,k,bi,bj) |
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#ifdef ISOTROPIC_COS_SCALING |
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& *cosFacV(j+1,bi,bj) |
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#endif |
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& -viscA4_W(i,j,k,bi,bj)*del2w(i,j) |
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#ifdef ISOTROPIC_COS_SCALING |
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# ifdef COSINEMETH_III |
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& *sqCosFacV(j+1,bi,bj) |
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# else |
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& *cosFacV(j+1,bi,bj) |
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# endif |
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#endif |
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& ) |
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& )*recip_rThickC(i,j)*recip_rA(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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#ifdef ALLOW_DIAGNOSTICS |
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IF (useDiagnostics) THEN |
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CALL DIAGNOSTICS_FILL(gwSideDrag,'WSidDrag',k,1,2,bi,bj,myThid) |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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#endif /* ALLOW_NONHYDROSTATIC */ |
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RETURN |
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END |
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