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C $Header: /u/gcmpack/MITgcm/pkg/mom_vecinv/mom_vi_u_coriolis_c4.F,v 1.13 2011/05/13 00:56:30 jmc Exp $ |
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C $Name: $ |
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|
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#include "MOM_VECINV_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: MOM_VI_U_CORIOLIS_C4 |
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C !INTERFACE: |
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SUBROUTINE MOM_VI_U_CORIOLIS_C4( |
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I bi,bj,k, |
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I vFld,omega3,r_hFacZ, |
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O uCoriolisTerm, |
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I myThid) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R MOM_VI_U_CORIOLIS_C4 |
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C |==========================================================* |
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C | o Calculate flux (in Y-dir.) of vorticity at U point |
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C | using 4th order (or 1rst order) interpolation |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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C == Global variables == |
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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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#ifdef ALLOW_EXCH2 |
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#include "W2_EXCH2_SIZE.h" |
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#include "W2_EXCH2_TOPOLOGY.h" |
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#endif /* ALLOW_EXCH2 */ |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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INTEGER bi,bj,k |
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_RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL omega3(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS r_hFacZ(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL uCoriolisTerm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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CEOP |
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|
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C == Local variables == |
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C msgBuf :: Informational/error meesage buffer |
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CHARACTER*(MAX_LEN_MBUF) msgBuf |
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INTEGER i,j |
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_RL vort3r(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vBarXY,vort3u,Rjp,Rjm,Rj |
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_RL vBarXm,vBarXp |
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|
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LOGICAL northWestCorner, northEastCorner, |
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& southWestCorner, southEastCorner |
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INTEGER myFace |
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#ifdef ALLOW_EXCH2 |
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INTEGER myTile |
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#endif /* ALLOW_EXCH2 */ |
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_RL oneSixth, oneTwelve |
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LOGICAL fourthVort3 |
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C jmc: not sure about these 1/6 & 1/12 factors (should use the same) |
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PARAMETER(oneSixth=1.D0/6.D0 , oneTwelve=1.D0/12.D0) |
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PARAMETER(fourthVort3=.TRUE. ) |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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vort3r(i,j) = r_hFacZ(i,j)*omega3(i,j) |
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ENDDO |
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ENDDO |
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|
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C-- Special stuff for Cubed Sphere |
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IF ( useCubedSphereExchange.AND.highOrderVorticity ) THEN |
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|
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#ifdef ALLOW_EXCH2 |
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myTile = W2_myTileList(bi,bj) |
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myFace = exch2_myFace(myTile) |
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southWestCorner = exch2_isWedge(myTile).EQ.1 |
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& .AND. exch2_isSedge(myTile).EQ.1 |
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southEastCorner = exch2_isEedge(myTile).EQ.1 |
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& .AND. exch2_isSedge(myTile).EQ.1 |
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northEastCorner = exch2_isEedge(myTile).EQ.1 |
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& .AND. exch2_isNedge(myTile).EQ.1 |
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northWestCorner = exch2_isWedge(myTile).EQ.1 |
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& .AND. exch2_isNedge(myTile).EQ.1 |
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#else |
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myFace = bi |
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southWestCorner = .TRUE. |
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southEastCorner = .TRUE. |
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northWestCorner = .TRUE. |
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northEastCorner = .TRUE. |
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#endif /* ALLOW_EXCH2 */ |
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IF ( southWestCorner ) THEN |
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i = 1 |
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j = 1 |
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vort3r(i,j-1) = ( vort3r(i,j-1) + vort3r(i+1,j) )*0.5 _d 0 |
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ENDIF |
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IF ( southEastCorner ) THEN |
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i = sNx+1 |
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j = 1 |
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vort3r(i,j-1) = ( vort3r(i,j-1) + vort3r(i-1,j) )*0.5 _d 0 |
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ENDIF |
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IF ( northWestCorner ) THEN |
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i = 1 |
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j = sNy+1 |
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vort3r(i,j+1) = ( vort3r(i,j+1) + vort3r(i+1,j) )*0.5 _d 0 |
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ENDIF |
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IF ( northEastCorner ) THEN |
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i = sNx+1 |
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j = sNy+1 |
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vort3r(i,j+1) = ( vort3r(i,j+1) + vort3r(i-1,j) )*0.5 _d 0 |
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ENDIF |
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|
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C-- End of special stuff for Cubed Sphere. |
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ENDIF |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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IF ( selectVortScheme.EQ.0 ) THEN |
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C-- using Sadourny Enstrophy conserving discretization: |
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|
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c DO j=2-Oly,sNy+Oly-2 |
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c DO i=2-Olx,sNx+Olx |
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DO j=1,sNy |
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DO i=1,sNx+1 |
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|
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vBarXY=0.25*( |
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& (vFld( i , j )*dxG( i , j ,bi,bj)*_hFacS( i , j ,k,bi,bj) |
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& +vFld(i-1, j )*dxG(i-1, j ,bi,bj)*_hFacS(i-1, j ,k,bi,bj)) |
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& +(vFld( i ,j+1)*dxG( i ,j+1,bi,bj)*_hFacS( i ,j+1,k,bi,bj) |
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& +vFld(i-1,j+1)*dxG(i-1,j+1,bi,bj)*_hFacS(i-1,j+1,k,bi,bj)) |
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& ) |
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IF (upwindVorticity) THEN |
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IF (vBarXY.GT.0.) THEN |
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vort3u=vort3r(i,j) |
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ELSE |
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vort3u=vort3r(i,j+1) |
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ENDIF |
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ELSEIF (fourthVort3) THEN |
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#ifdef ALLOW_OBCS |
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Rjp = ( vort3r(i,j+2) - vort3r(i,j+1) )*maskInW(i,j+1,bi,bj) |
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Rjm = ( vort3r(i, j ) - vort3r(i,j-1) )*maskInW(i,j-1,bi,bj) |
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#else |
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Rjp = vort3r(i,j+2) - vort3r(i,j+1) |
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Rjm = vort3r(i, j ) - vort3r(i,j-1) |
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#endif |
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vort3u=0.5*( (vort3r(i,j) + vort3r(i,j+1)) |
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& -oneTwelve*(Rjp-Rjm) |
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& ) |
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ELSE |
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vort3u=0.5*( vort3r(i,j) + vort3r(i,j+1) ) |
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ENDIF |
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|
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uCoriolisTerm(i,j) = vort3u*vBarXY*recip_dxC(i,j,bi,bj) |
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& * _maskW(i,j,k,bi,bj) |
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|
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ENDDO |
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ENDDO |
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|
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ELSEIF ( selectVortScheme.EQ.2 ) THEN |
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C-- using Energy conserving discretization: |
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|
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c DO j=2-Oly,sNy+Oly-2 |
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c DO i=2-Olx,sNx+Olx |
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DO j=1,sNy |
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DO i=1,sNx+1 |
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|
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vBarXm=0.5*( |
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& vFld( i , j )*dxG( i , j ,bi,bj)*_hFacS( i , j ,k,bi,bj) |
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& +vFld(i-1, j )*dxG(i-1, j ,bi,bj)*_hFacS(i-1, j ,k,bi,bj) ) |
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vBarXp=0.5*( |
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& vFld( i ,j+1)*dxG( i ,j+1,bi,bj)*_hFacS( i ,j+1,k,bi,bj) |
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& +vFld(i-1,j+1)*dxG(i-1,j+1,bi,bj)*_hFacS(i-1,j+1,k,bi,bj) ) |
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IF (upwindVorticity) THEN |
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IF ( (vBarXm+vBarXp) .GT.0.) THEN |
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vort3u=vBarXm*vort3r(i, j ) |
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ELSE |
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vort3u=vBarXp*vort3r(i,j+1) |
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ENDIF |
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ELSEIF (fourthVort3) THEN |
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#ifdef ALLOW_OBCS |
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Rjp = ( vort3r(i,j+2) - vort3r(i,j+1) )*maskInW(i,j+1,bi,bj) |
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Rjm = ( vort3r(i, j ) - vort3r(i,j-1) )*maskInW(i,j-1,bi,bj) |
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#else |
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Rjp = vort3r(i,j+2) - vort3r(i,j+1) |
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Rjm = vort3r(i, j ) - vort3r(i,j-1) |
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#endif |
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Rj = vort3r(i,j+1) - vort3r(i, j ) |
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Rjp = vort3r(i,j+1) -oneSixth*( Rjp-Rj ) |
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Rjm = vort3r(i, j ) -oneSixth*( Rj-Rjm ) |
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c Rjp = vort3r(i,j+1) -oneSixth*( vort3r(i,j+2)-vort3r(i, j ) ) |
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c Rjm = vort3r(i, j ) +oneSixth*( vort3r(i,j+1)-vort3r(i,j-1) ) |
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vort3u=0.5*( vBarXm*Rjm + vBarXp*Rjp ) |
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ELSE |
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vort3u=0.5*( vBarXm*vort3r(i, j ) + vBarXp*vort3r(i,j+1) ) |
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ENDIF |
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|
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uCoriolisTerm(i,j) = vort3u*recip_dxC(i,j,bi,bj) |
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& * _maskW(i,j,k,bi,bj) |
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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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WRITE(msgBuf,'(A,I5,A)') |
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& 'MOM_VI_U_CORIOLIS_C4: selectVortScheme=', selectVortScheme, |
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& ' not implemented' |
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CALL PRINT_ERROR( msgBuf, myThid ) |
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STOP 'ABNORMAL END: S/R MOM_VI_U_CORIOLIS_C4' |
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|
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ENDIF |
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|
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RETURN |
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END |
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