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heimbach |
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C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_dst3fl_adv_x.F,v 1.1 2001/09/04 14:53:11 adcroft Exp $ |
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C $Name: $ |
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adcroft |
1.1 |
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#include "GAD_OPTIONS.h" |
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SUBROUTINE GAD_DST3FL_ADV_X( |
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I bi,bj,k,deltaT, |
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I uTrans, uVel, |
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I 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_DST3FL_ADV_X | |
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C | o Compute Zonal advective Flux of Tracer using | |
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C | 3rd Order DST Sceheme with flux limiting | |
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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 "GAD.h" |
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C == Routine arguments == |
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INTEGER bi,bj,k |
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_RL deltaT |
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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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_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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C == Local variables == |
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INTEGER i,j |
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_RL Rjm,Rj,Rjp,cfl,d0,d1,psiP,thetaP,psiM,thetaM |
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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))*maskW(i+1,j,k,bi,bj) |
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Rj =(tracer(i,j)-tracer(i-1,j))*maskW(i,j,k,bi,bj) |
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Rjm=(tracer(i-1,j)-tracer(i-2,j))*maskW(i-1,j,k,bi,bj) |
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cfl=uVel(i,j,k,bi,bj)*deltaT*recip_dxc(i,j,bi,bj) |
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d0=(2.-abs(cfl))*(1.-abs(cfl))*oneSixth |
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d1=(1.-cfl)*(1.+cfl)*oneSixth |
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thetaP=Rjm/(1.D-30+Rj) |
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psiP=d0+d1*thetaP |
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psiP=max(0., min(min(1.,psiP),(1.-cfl)/cfl*thetaP) ) |
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thetaM=Rjp/(-1.D-30+Rj) |
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psiM=d0+d1*thetaM |
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psiM=max(0., min(min(1.,psiM),(1.-cfl)/cfl*thetaM) ) |
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uT(i,j)= |
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heimbach |
1.2 |
& 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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cph *note* put these comments after end of continued line |
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cph to ensure TAMC compatibility |
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adcroft |
1.1 |
c & 0.5*(uTrans(i,j)+abs(uTrans(i,j))) |
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c & *( Tracer(i-1,j) + d0*Rj + d1*Rjm ) |
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c & +0.5*(uTrans(i,j)-abs(uTrans(i,j))) |
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c & *( Tracer( i ,j) - d0*Rj + d1*Rjp ) |
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ENDDO |
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ENDDO |
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RETURN |
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END |
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