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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_dst3_adv_y.F,v 1.5 2005/04/03 16:05:34 heimbach Exp $ |
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C $Name: $ |
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#include "GAD_OPTIONS.h" |
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SUBROUTINE GAD_DST3_ADV_Y( |
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I bi,bj,k,deltaTloc, |
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I vTrans, vVel, |
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I maskLocS, tracer, |
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O vT, |
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I myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE GAD_DST3_ADV_Y | |
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C | o Compute Meridional advective Flux of Tracer using | |
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C | 3rd Order DST Sceheme | |
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C |==========================================================| |
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IMPLICIT NONE |
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C == GLobal variables == |
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#include "SIZE.h" |
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#include "GRID.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GAD.h" |
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C == Routine arguments == |
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INTEGER bi,bj,k |
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_RL deltaTloc |
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_RL vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vVel(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RS maskLocS(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vT (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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C == Local variables == |
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C vFld :: velocity [m/s], meridional component |
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INTEGER i,j |
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_RL Rjm,Rj,Rjp,cfl,d0,d1 |
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_RL psiP,psiM,thetaP,thetaM |
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_RL vFld |
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_RL smallNo |
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_RL Rjjm,Rjjp |
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IF (inAdMode) THEN |
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smallNo = 1.0D-20 |
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ELSE |
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smallNo = 1.0D-20 |
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ENDIF |
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DO i=1-Olx,sNx+Olx |
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vT(i,1-Oly)=0. |
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vT(i,2-Oly)=0. |
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vT(i,sNy+Oly)=0. |
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ENDDO |
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DO j=1-Oly+2,sNy+Oly-1 |
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DO i=1-Olx,sNx+Olx |
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Rjp=(tracer(i,j+1)-tracer(i, j ))*maskLocS(i,j+1) |
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Rj =(tracer(i, j )-tracer(i,j-1))*maskLocS(i, j ) |
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Rjm=(tracer(i,j-1)-tracer(i,j-2))*maskLocS(i,j-1) |
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c vFld = vVel(i,j,k,bi,bj) |
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vFld = vTrans(i,j)*recip_dxG(i,j,bi,bj) |
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& *recip_drF(k)*recip_hFacS(i,j,k,bi,bj) |
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cfl=abs(vFld*deltaTloc*recip_dyC(i,j,bi,bj)) |
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d0=(2.-cfl)*(1.-cfl)*oneSixth |
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d1=(1.-cfl*cfl)*oneSixth |
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#ifdef ALLOW_MATRIX |
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IF (.NOT.useMATRIX) THEN |
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#endif /* ALLOW_MATRIX */ |
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IF ( ABS(Rj).LT.smallNo .OR. |
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& ABS(Rjm).LT.smallNo ) THEN |
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thetaP=0. |
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psiP=0. |
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ELSE |
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thetaP=(Rjm+smallNo)/(smallNo+Rj) |
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psiP=d0+d1*thetaP |
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ENDIF |
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IF ( ABS(Rj).LT.smallNo .OR. |
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& ABS(Rjp).LT.smallNo ) THEN |
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thetaM=0. |
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psiM=0. |
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ELSE |
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thetaM=(Rjp+smallNo)/(smallNo+Rj) |
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psiM=d0+d1*thetaM |
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ENDIF |
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vT(i,j)= |
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& 0.5*(vTrans(i,j)+abs(vTrans(i,j))) |
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& *( Tracer(i,j-1) + psiP*Rj ) |
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& +0.5*(vTrans(i,j)-abs(vTrans(i,j))) |
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& *( Tracer(i, j ) - psiM*Rj ) |
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#ifdef ALLOW_MATRIX |
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ELSE |
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vT(i,j)= |
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& 0.5*(vTrans(i,j)+abs(vTrans(i,j))) |
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& *( Tracer(i,j-1) + (d0*Rj+d1*Rjm) ) |
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& +0.5*(vTrans(i,j)-abs(vTrans(i,j))) |
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& *( Tracer(i, j ) - (d0*Rj+d1*Rjp) ) |
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ENDIF |
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#endif /* ALLOW_MATRIX */ |
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ENDDO |
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ENDDO |
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RETURN |
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END |
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