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jmc |
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C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_fluxlimit_adv_x.F,v 1.1 2001/05/30 19:34:48 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_FLUXLIMIT_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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jmc |
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C /==========================================================\ |
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C | SUBROUTINE GAD_FLUXLIMIT_ADV_X | |
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C | o Compute Zonal advective Flux of Tracer using | |
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C | Flux Limiter Scheme | |
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C |==========================================================| |
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adcroft |
1.1 |
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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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 Cr,Rjm,Rj,Rjp |
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#include "GAD_FLUX_LIMITER.h" |
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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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IF (Rj.NE.0.) THEN |
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IF (uTrans(i,j).GT.0) THEN |
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Cr=Rjm/Rj |
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ELSE |
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Cr=Rjp/Rj |
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ENDIF |
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ELSE |
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IF (uTrans(i,j).GT.0) THEN |
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Cr=Rjm*1.E20 |
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ELSE |
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Cr=Rjp*1.E20 |
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ENDIF |
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ENDIF |
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Cr=Limiter(Cr) |
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uT(i,j) = |
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& uTrans(i,j)*(Tracer(i,j)+Tracer(i-1,j))*0.5 _d 0 |
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& -0.5*( |
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& (1-Cr)*ABS(uTrans(i,j)) |
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& +uTrans(i,j)*uVel(i,j,k,bi,bj)*deltaT |
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& *recip_dxC(i,j,bi,bj)*Cr |
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& )*Rj |
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ENDDO |
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ENDDO |
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RETURN |
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END |