/[MITgcm]/MITgcm/pkg/generic_advdiff/gad_dst3fl_adv_x.F
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Contents of /MITgcm/pkg/generic_advdiff/gad_dst3fl_adv_x.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_x.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_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_DST3FL_ADV_X |
14 C | o Compute Zonal 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 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 INTEGER i,j
35 _RL Rjm,Rj,Rjp,cfl,d0,d1,psiP,psiM,thetaP,thetaM
36
37 DO j=1-Oly,sNy+Oly
38 uT(1-Olx,j)=0.D0
39 uT(2-Olx,j)=0.D0
40 uT(sNx+Olx,j)=0.D0
41 DO i=1-Olx+2,sNx+Olx-1
42 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
46 cfl=abs(uVel(i,j,k,bi,bj)*deltaT*recip_dxc(i,j,bi,bj))
47 d0=(2.D0-cfl)*(1.D0-cfl)*oneSixth
48 d1=(1.D0-cfl*cfl)*oneSixth
49 c thetaP=0.D0
50 c IF (Rj.NE.0.D0) thetaP=Rjm/Rj
51 thetaP=Rjm/(1.D-20+Rj)
52 psiP=d0+d1*thetaP
53 psiP=max(0.D0, min(min(1.D0,psiP),
54 & (1.D0-cfl)/(1.D-20+cfl)*thetaP))
55 thetaM=Rjp/(1.D-20+Rj)
56 c thetaM=0.D0
57 c IF (Rj.NE.0.D0) thetaM=Rjp/Rj
58 psiM=d0+d1*thetaM
59 psiM=max(0.D0, min(min(1.D0,psiM),
60 & (1.D0-cfl)/(1.D-20+cfl)*thetaM))
61 uT(i,j)=
62 & 0.5*(uTrans(i,j)+abs(uTrans(i,j)))
63 & *( Tracer(i-1,j) + psiP*Rj )
64 & +0.5*(uTrans(i,j)-abs(uTrans(i,j)))
65 & *( Tracer( i ,j) - psiM*Rj )
66
67 ENDDO
68 ENDDO
69
70 RETURN
71 END
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