pkg/generic_advdiff/gad_fluxlimit_adv_y.F

C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_fluxlimit_adv_y.F,v 1.1 2001/05/30 19:34:48 adcroft Exp $
C $Name:  $

#include "GAD_OPTIONS.h"

      SUBROUTINE GAD_FLUXLIMIT_ADV_Y( 
     I           bi,bj,k,deltaT,
     I           vTrans, vVel,
     I           tracer,
     O           vT,
     I           myThid )
C     /==========================================================\
C     | SUBROUTINE GAD_FLUXLIMIT_ADV_Y                           |
C     | o Compute Meridional 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 vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL vVel  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
      _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL vT    (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 i=1-Olx,sNx+Olx
       vT(i,1-Oly)=0.
       vT(i,2-Oly)=0.
       vT(i,sNy+Oly)=0.
      ENDDO
      DO j=1-Oly+2,sNy+Oly-1
       DO i=1-Olx,sNx+Olx
        Rjp=(tracer(i,j+1)-tracer(i,j))*maskS(i,j+1,k,bi,bj)
        Rj=(tracer(i,j)-tracer(i,j-1))*maskS(i,j,k,bi,bj)
        Rjm=(tracer(i,j-1)-tracer(i,j-2))*maskS(i,j-1,k,bi,bj)
        IF (Rj.NE.0.) THEN
         IF (vTrans(i,j).GT.0) THEN
           Cr=Rjm/Rj
         ELSE
           Cr=Rjp/Rj
         ENDIF
        ELSE
         IF (vTrans(i,j).GT.0) THEN
           Cr=Rjm*1.E20
         ELSE
           Cr=Rjp*1.E20
         ENDIF
        ENDIF
        Cr=Limiter(Cr)
        vT(i,j) = 
     &   vTrans(i,j)*(Tracer(i,j)+Tracer(i,j-1))*0.5 _d 0
     &   -0.5*(
     &        (1-Cr)*ABS(vTrans(i,j))
     &        +vTrans(i,j)*vVel(i,j,k,bi,bj)*deltaT
     &         *recip_dyC(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_y.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_Y(
7			I bi,bj,k,deltaT,
8			I vTrans, vVel,
9			I tracer,
10			O vT,
11			I myThid )
12	jmc	1.2	C /==========================================================\
13			C \| SUBROUTINE GAD_FLUXLIMIT_ADV_Y \|
14			C \| o Compute Meridional 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 vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
27			_RL vVel (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
28			_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
29			_RL vT (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 i=1-Olx,sNx+Olx
38			vT(i,1-Oly)=0.
39	jmc	1.2	vT(i,2-Oly)=0.
40			vT(i,sNy+Oly)=0.
41	adcroft	1.1	ENDDO
42	jmc	1.2	DO j=1-Oly+2,sNy+Oly-1
43	adcroft	1.1	DO i=1-Olx,sNx+Olx
44			Rjp=(tracer(i,j+1)-tracer(i,j))*maskS(i,j+1,k,bi,bj)
45			Rj=(tracer(i,j)-tracer(i,j-1))*maskS(i,j,k,bi,bj)
46			Rjm=(tracer(i,j-1)-tracer(i,j-2))*maskS(i,j-1,k,bi,bj)
47			IF (Rj.NE.0.) THEN
48			IF (vTrans(i,j).GT.0) THEN
49			Cr=Rjm/Rj
50			ELSE
51			Cr=Rjp/Rj
52			ENDIF
53			ELSE
54			IF (vTrans(i,j).GT.0) THEN
55			Cr=Rjm*1.E20
56			ELSE
57			Cr=Rjp*1.E20
58			ENDIF
59			ENDIF
60			Cr=Limiter(Cr)
61			vT(i,j) =
62			& vTrans(i,j)(Tracer(i,j)+Tracer(i,j-1))0.5 _d 0
63			& -0.5*(
64			& (1-Cr)*ABS(vTrans(i,j))
65			& +vTrans(i,j)vVel(i,j,k,bi,bj)deltaT
66			& recip_dyC(i,j,bi,bj)Cr
67			& )*Rj
68			ENDDO
69			ENDDO
70
71			RETURN
72			END