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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_dst3_adv_x.F,v 1.4 2004/09/24 16:53:45 jmc Exp $ |
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C $Name: $ |
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|
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#include "GAD_OPTIONS.h" |
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|
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SUBROUTINE GAD_DST3_ADV_X( |
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I bi,bj,k,deltaTloc, |
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I uTrans, uVel, |
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I maskLocW, tracer, |
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O uT, |
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I myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE GAD_DST3_ADV_X | |
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C | o Compute Zonal 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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|
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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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|
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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 uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL uVel(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RS maskLocW(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 uT (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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|
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C == Local variables == |
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C uFld :: velocity [m/s], zonal 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 uFld |
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_RL smallNo |
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_RL Rjjm,Rjjp |
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|
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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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|
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DO j=1-Oly,sNy+Oly |
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uT(1-Olx,j)=0. |
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uT(2-Olx,j)=0. |
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uT(sNx+Olx,j)=0. |
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DO i=1-Olx+2,sNx+Olx-1 |
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Rjp=(tracer(i+1,j)-tracer( i ,j))*maskLocW(i+1,j) |
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Rj =(tracer( i ,j)-tracer(i-1,j))*maskLocW( i ,j) |
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Rjm=(tracer(i-1,j)-tracer(i-2,j))*maskLocW(i-1,j) |
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|
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c uFld = uVel(i,j,k,bi,bj) |
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uFld = uTrans(i,j)*recip_dyG(i,j,bi,bj) |
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& *recip_drF(k)*recip_hFacW(i,j,k,bi,bj) |
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cfl=abs(uFld*deltaTloc*recip_dxC(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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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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uT(i,j)= |
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& 0.5*(uTrans(i,j)+abs(uTrans(i,j))) |
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& *( Tracer(i-1,j) + psiP*Rj ) |
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& +0.5*(uTrans(i,j)-abs(uTrans(i,j))) |
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& *( Tracer( i ,j) - psiM*Rj ) |
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|
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ENDDO |
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ENDDO |
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|
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RETURN |
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END |
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