| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_dst3_adv_x.F,v 1.3 2002/03/06 01:29:36 jmc Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "GAD_OPTIONS.h" |
| 5 |
|
| 6 |
SUBROUTINE GAD_DST3_ADV_X( |
| 7 |
I bi,bj,k,deltaT, |
| 8 |
I uTrans, uVel, |
| 9 |
I tracer, |
| 10 |
O uT, |
| 11 |
I myThid ) |
| 12 |
C /==========================================================\ |
| 13 |
C | SUBROUTINE GAD_DST3_ADV_X | |
| 14 |
C | o Compute Zonal advective Flux of Tracer using | |
| 15 |
C | 3rd Order DST Sceheme | |
| 16 |
C |==========================================================| |
| 17 |
IMPLICIT NONE |
| 18 |
|
| 19 |
C == GLobal variables == |
| 20 |
#include "SIZE.h" |
| 21 |
#include "GRID.h" |
| 22 |
#include "GAD.h" |
| 23 |
|
| 24 |
C == Routine arguments == |
| 25 |
INTEGER bi,bj,k |
| 26 |
_RL deltaT |
| 27 |
_RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 28 |
_RL uVel(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
| 29 |
_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 30 |
_RL uT (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 31 |
INTEGER myThid |
| 32 |
|
| 33 |
C == Local variables == |
| 34 |
C uFld :: velocity [m/s], zonal component |
| 35 |
INTEGER i,j |
| 36 |
_RL Rjm,Rj,Rjp,cfl,d0,d1 |
| 37 |
_RL psiP,psiM,thetaP,thetaM |
| 38 |
_RL uFld |
| 39 |
|
| 40 |
DO j=1-Oly,sNy+Oly |
| 41 |
uT(1-Olx,j)=0. |
| 42 |
uT(2-Olx,j)=0. |
| 43 |
uT(sNx+Olx,j)=0. |
| 44 |
DO i=1-Olx+2,sNx+Olx-1 |
| 45 |
Rjp=(tracer(i+1,j)-tracer(i,j))*maskW(i+1,j,k,bi,bj) |
| 46 |
Rj =(tracer(i,j)-tracer(i-1,j))*maskW(i,j,k,bi,bj) |
| 47 |
Rjm=(tracer(i-1,j)-tracer(i-2,j))*maskW(i-1,j,k,bi,bj) |
| 48 |
|
| 49 |
c uFld = uVel(i,j,k,bi,bj) |
| 50 |
uFld = uTrans(i,j)*recip_dyG(i,j,bi,bj) |
| 51 |
& *recip_drF(k)*recip_hFacW(i,j,k,bi,bj) |
| 52 |
cfl=abs(uFld*deltaT*recip_dxC(i,j,bi,bj)) |
| 53 |
d0=(2.-cfl)*(1.-cfl)*oneSixth |
| 54 |
d1=(1.-cfl*cfl)*oneSixth |
| 55 |
c thetaP=0. |
| 56 |
c IF (Rj.NE.0.) thetaP=Rjm/Rj |
| 57 |
thetaP=Rjm/(1.D-20+Rj) |
| 58 |
psiP=d0+d1*thetaP |
| 59 |
c psiP=max(0.,min(min(1.,psiP),(1.-cfl)/(1.D-20+cfl)*thetaP)) |
| 60 |
thetaM=Rjp/(1.D-20+Rj) |
| 61 |
c thetaM=0. |
| 62 |
c IF (Rj.NE.0.) thetaM=Rjp/Rj |
| 63 |
psiM=d0+d1*thetaM |
| 64 |
c psiM=max(0.,min(min(1.,psiM),(1.-cfl)/(1.D-20+cfl)*thetaM)) |
| 65 |
uT(i,j)= |
| 66 |
& 0.5*(uTrans(i,j)+abs(uTrans(i,j))) |
| 67 |
& *( Tracer(i-1,j) + psiP*Rj ) |
| 68 |
& +0.5*(uTrans(i,j)-abs(uTrans(i,j))) |
| 69 |
& *( Tracer( i ,j) - psiM*Rj ) |
| 70 |
|
| 71 |
ENDDO |
| 72 |
ENDDO |
| 73 |
|
| 74 |
RETURN |
| 75 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph