/[MITgcm]/MITgcm/pkg/generic_advdiff/gad_dst3fl_adv_y.F
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Contents of /MITgcm/pkg/generic_advdiff/gad_dst3fl_adv_y.F

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Revision 1.4 - (show annotations) (download)
Thu Nov 8 23:39:34 2001 UTC (22 years, 6 months ago) by heimbach
Branch: MAIN
CVS Tags: checkpoint44e_post, checkpoint44f_post, checkpoint43a-release1mods, chkpt44d_post, checkpoint44e_pre, release1-branch_tutorials, chkpt44a_post, chkpt44c_pre, checkpoint44g_post, release1-branch-end, release1_final_v1, checkpoint44b_post, chkpt44a_pre, checkpoint44b_pre, checkpoint44, chkpt44c_post, checkpoint44f_pre, release1-branch_branchpoint
Branch point for: release1_final, release1-branch
Changes since 1.3: +15 -13 lines 
Replacing floating point numbers by ...D0 in MIN/MAX expressions
to avoid inconsistencies and problems on some platforms (e.g. IBM SP3).
(spotted by G. Gebbie)
1 C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_dst3fl_adv_y.F,v 1.3 2001/09/10 00:24:14 adcroft Exp $
2 C $Name: checkpoint43 $
3
4 #include "GAD_OPTIONS.h"
5
6 SUBROUTINE GAD_DST3FL_ADV_Y(
7 I bi,bj,k,deltaT,
8 I vTrans, vVel,
9 I tracer,
10 O vT,
11 I myThid )
12 C /==========================================================\
13 C | SUBROUTINE GAD_DST3FL_ADV_Y |
14 C | o Compute Meridional advective Flux of Tracer using |
15 C | 3rd Order DST Sceheme with flux limiting |
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 vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
28 _RL vVel(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
29 _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
30 _RL vT (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
31 INTEGER myThid
32
33 C == Local variables ==
34 INTEGER i,j
35 _RL Rjm,Rj,Rjp,cfl,d0,d1,psiP,psiM,thetaP,thetaM
36
37 DO i=1-Olx,sNx+Olx
38 vT(i,1-Oly)=0.D0
39 vT(i,2-Oly)=0.D0
40 vT(i,sNy+Oly)=0.D0
41 ENDDO
42 DO j=1-Oly+2,sNy+Oly-1
43 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
48 cfl=abs(vVel(i,j,k,bi,bj)*deltaT*recip_dyc(i,j,bi,bj))
49 d0=(2.D0-cfl)*(1.D0-cfl)*oneSixth
50 d1=(1.D0-cfl*cfl)*oneSixth
51 c thetaP=0.D0
52 c IF (Rj.NE.0.D0) thetaP=Rjm/Rj
53 thetaP=Rjm/(1.D-20+Rj)
54 psiP=d0+d1*thetaP
55 psiP=max(0.D0, min(min(1.D0,psiP),
56 & (1.D0-cfl)/(1.D-20+cfl)*thetaP))
57 thetaM=Rjp/(1.D-20+Rj)
58 c thetaM=0.D0
59 c IF (Rj.NE.0.D0) thetaM=Rjp/Rj
60 psiM=d0+d1*thetaM
61 psiM=max(0.D0, min(min(1.D0,psiM),
62 & (1.D0-cfl)/(1.D-20+cfl)*thetaM))
63 vT(i,j)=
64 & 0.5*(vTrans(i,j)+abs(vTrans(i,j)))
65 & *( Tracer(i,j-1) + psiP*Rj )
66 & +0.5*(vTrans(i,j)-abs(vTrans(i,j)))
67 & *( Tracer(i, j ) - psiM*Rj )
68
69 ENDDO
70 ENDDO
71
72 RETURN
73 END
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