pkg/generic_advdiff/gad_fluxlimit_adv_x.F

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 $
C $Name:  $

#include "GAD_OPTIONS.h"

      SUBROUTINE GAD_FLUXLIMIT_ADV_X( 
     I           bi,bj,k,deltaT,
     I           uTrans, uVel,
     I           tracer,
     O           uT,
     I           myThid )
C     /==========================================================\
C     | SUBROUTINE GAD_FLUXLIMIT_ADV_X                           |
C     | o Compute Zonal advective Flux of Tracer using           |
C     |   Flux Limiter Scheme                                    |
C     |==========================================================|
      IMPLICIT NONE

C     == GLobal variables ==
#include "SIZE.h"
#include "GRID.h"

C     == Routine arguments ==
      INTEGER bi,bj,k
      _RL deltaT
      _RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL uVel  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
      _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL uT    (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      INTEGER myThid

C     == Local variables ==
      INTEGER i,j
      _RL Cr,Rjm,Rj,Rjp
#include "GAD_FLUX_LIMITER.h"

      DO j=1-Oly,sNy+Oly
       uT(1-Olx,j)=0.
       uT(2-Olx,j)=0.
       uT(sNx+Olx,j)=0.
       DO i=1-Olx+2,sNx+Olx-1
        Rjp=(tracer(i+1,j)-tracer(i,j))*maskW(i+1,j,k,bi,bj)
        Rj=(tracer(i,j)-tracer(i-1,j))*maskW(i,j,k,bi,bj)
        Rjm=(tracer(i-1,j)-tracer(i-2,j))*maskW(i-1,j,k,bi,bj)
        IF (Rj.NE.0.) THEN
         IF (uTrans(i,j).GT.0) THEN
           Cr=Rjm/Rj
         ELSE
           Cr=Rjp/Rj
         ENDIF
        ELSE
         IF (uTrans(i,j).GT.0) THEN
           Cr=Rjm*1.E20
         ELSE
           Cr=Rjp*1.E20
         ENDIF
        ENDIF
        Cr=Limiter(Cr)
        uT(i,j) = 
     &   uTrans(i,j)*(Tracer(i,j)+Tracer(i-1,j))*0.5 _d 0
     &   -0.5*(
     &        (1-Cr)*ABS(uTrans(i,j))
     &        +uTrans(i,j)*uVel(i,j,k,bi,bj)*deltaT
     &         *recip_dxC(i,j,bi,bj)*Cr
     &        )*Rj
       ENDDO
      ENDDO

      RETURN
      END
1	jmc	1.2	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 $
2			C $Name: $
3	adcroft	1.1
4			#include "GAD_OPTIONS.h"
5
6			SUBROUTINE GAD_FLUXLIMIT_ADV_X(
7			I bi,bj,k,deltaT,
8			I uTrans, uVel,
9			I tracer,
10			O uT,
11			I myThid )
12	jmc	1.2	C /==========================================================\
13			C \| SUBROUTINE GAD_FLUXLIMIT_ADV_X \|
14			C \| o Compute Zonal advective Flux of Tracer using \|
15			C \| Flux Limiter Scheme \|
16			C \|==========================================================\|
17	adcroft	1.1	IMPLICIT NONE
18
19			C == GLobal variables ==
20			#include "SIZE.h"
21			#include "GRID.h"
22
23			C == Routine arguments ==
24			INTEGER bi,bj,k
25			_RL deltaT
26			_RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
27			_RL uVel (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
28			_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
29			_RL uT (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
30			INTEGER myThid
31
32			C == Local variables ==
33			INTEGER i,j
34			_RL Cr,Rjm,Rj,Rjp
35			#include "GAD_FLUX_LIMITER.h"
36
37			DO j=1-Oly,sNy+Oly
38			uT(1-Olx,j)=0.
39	jmc	1.2	uT(2-Olx,j)=0.
40			uT(sNx+Olx,j)=0.
41			DO i=1-Olx+2,sNx+Olx-1
42	adcroft	1.1	Rjp=(tracer(i+1,j)-tracer(i,j))*maskW(i+1,j,k,bi,bj)
43			Rj=(tracer(i,j)-tracer(i-1,j))*maskW(i,j,k,bi,bj)
44			Rjm=(tracer(i-1,j)-tracer(i-2,j))*maskW(i-1,j,k,bi,bj)
45			IF (Rj.NE.0.) THEN
46			IF (uTrans(i,j).GT.0) THEN
47			Cr=Rjm/Rj
48			ELSE
49			Cr=Rjp/Rj
50			ENDIF
51			ELSE
52			IF (uTrans(i,j).GT.0) THEN
53			Cr=Rjm*1.E20
54			ELSE
55			Cr=Rjp*1.E20
56			ENDIF
57			ENDIF
58			Cr=Limiter(Cr)
59			uT(i,j) =
60			& uTrans(i,j)(Tracer(i,j)+Tracer(i-1,j))0.5 _d 0
61			& -0.5*(
62			& (1-Cr)*ABS(uTrans(i,j))
63			& +uTrans(i,j)uVel(i,j,k,bi,bj)deltaT
64			& recip_dxC(i,j,bi,bj)Cr
65			& )*Rj
66			ENDDO
67			ENDDO
68
69			RETURN
70			END