/[MITgcm]/MITgcm/pkg/generic_advdiff/gad_dst3_adv_y.F
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revision 1.1 by adcroft, Tue Sep 4 14:53:11 2001 UTC revision 1.4 by jmc, Fri Sep 24 16:53:46 2004 UTC
# Line 6  C $Name$ Line 6  C $Name$
6        SUBROUTINE GAD_DST3_ADV_Y(        SUBROUTINE GAD_DST3_ADV_Y(
7       I           bi,bj,k,deltaT,       I           bi,bj,k,deltaT,
8       I           vTrans, vVel,       I           vTrans, vVel,
9       I           tracer,       I           maskLocS, tracer,
10       O           vT,       O           vT,
11       I           myThid )       I           myThid )
12  C     /==========================================================\  C     /==========================================================\
# Line 26  C     == Routine arguments == Line 26  C     == Routine arguments ==
26        _RL deltaT        _RL deltaT
27        _RL vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
28        _RL vVel(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)        _RL vVel(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
29          _RS maskLocS(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
30        _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
31        _RL vT    (1-OLx:sNx+OLx,1-OLy:sNy+OLy)        _RL vT    (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
32        INTEGER myThid        INTEGER myThid
33    
34  C     == Local variables ==  C     == Local variables ==
35    C     vFld    :: velocity [m/s], meridional component
36        INTEGER i,j        INTEGER i,j
37        _RL Rjm,Rj,Rjp,cfl,d0,d1        _RL Rjm,Rj,Rjp,cfl,d0,d1
38          _RL psiP,psiM,thetaP,thetaM
39          _RL vFld
40    
41        DO i=1-Olx,sNx+Olx        DO i=1-Olx,sNx+Olx
42         vT(i,1-Oly)=0.         vT(i,1-Oly)=0.
# Line 41  C     == Local variables == Line 45  C     == Local variables ==
45        ENDDO        ENDDO
46        DO j=1-Oly+2,sNy+Oly-1        DO j=1-Oly+2,sNy+Oly-1
47         DO i=1-Olx,sNx+Olx         DO i=1-Olx,sNx+Olx
48          Rjp=(tracer(i,j+1)-tracer(i,j))*maskS(i,j+1,k,bi,bj)          Rjp=(tracer(i,j+1)-tracer(i, j ))*maskLocS(i,j+1)
49          Rj =(tracer(i,j)-tracer(i,j-1))*maskS(i,j,k,bi,bj)          Rj =(tracer(i, j )-tracer(i,j-1))*maskLocS(i, j )
50          Rjm=(tracer(i,j-1)-tracer(i,j-2))*maskS(i,j-1,k,bi,bj)          Rjm=(tracer(i,j-1)-tracer(i,j-2))*maskLocS(i,j-1)
51    
52          cfl=vVel(i,j,k,bi,bj)*deltaT*recip_dyc(i,j,bi,bj)  c       vFld = vVel(i,j,k,bi,bj)
53          d0=(2.-abs(cfl))*(1.-abs(cfl))*oneSixth          vFld = vTrans(i,j)*recip_dxG(i,j,bi,bj)
54          d1=(1.-cfl)*(1.+cfl)*oneSixth       &       *recip_drF(k)*recip_hFacS(i,j,k,bi,bj)
55            cfl=abs(vFld*deltaT*recip_dyC(i,j,bi,bj))
56            d0=(2.-cfl)*(1.-cfl)*oneSixth
57            d1=(1.-cfl*cfl)*oneSixth
58    c       thetaP=0.
59    c       IF (Rj.NE.0.) thetaP=Rjm/Rj
60            thetaP=Rjm/(1.D-20+Rj)
61            psiP=d0+d1*thetaP
62    c       psiP=max(0.,min(min(1.,psiP),(1.-cfl)/(1.D-20+cfl)*thetaP))
63            thetaM=Rjp/(1.D-20+Rj)
64    c       thetaM=0.
65    c       IF (Rj.NE.0.) thetaM=Rjp/Rj
66            psiM=d0+d1*thetaM
67    c       psiM=max(0.,min(min(1.,psiM),(1.-cfl)/(1.D-20+cfl)*thetaM))
68          vT(i,j)=          vT(i,j)=
69       &   0.5*(vTrans(i,j)+abs(vTrans(i,j)))       &   0.5*(vTrans(i,j)+abs(vTrans(i,j)))
70       &      *( Tracer(i,j-1) + d0*Rj + d1*Rjm )       &      *( Tracer(i,j-1) + psiP*Rj )
71       &  +0.5*(vTrans(i,j)-abs(vTrans(i,j)))       &  +0.5*(vTrans(i,j)-abs(vTrans(i,j)))
72       &      *( Tracer(i, j ) - d0*Rj + d1*Rjp )       &      *( Tracer(i, j ) - psiM*Rj )
73    
74         ENDDO         ENDDO
75        ENDDO        ENDDO
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