/[MITgcm]/MITgcm/pkg/generic_advdiff/gad_dst2u1_adv_y.F
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Revision 1.7 - (show annotations) (download)
Wed Apr 4 01:39:06 2007 UTC (17 years, 1 month ago) by jmc
Branch: MAIN
CVS Tags: checkpoint64y, checkpoint64x, checkpoint64z, checkpoint64q, checkpoint64p, checkpoint64s, checkpoint64r, checkpoint64u, checkpoint64t, checkpoint64w, checkpoint64v, checkpoint64i, checkpoint64h, checkpoint64k, checkpoint64j, checkpoint64m, checkpoint64l, checkpoint64o, checkpoint64n, checkpoint64a, checkpoint64c, checkpoint64b, checkpoint64e, checkpoint64d, checkpoint64g, checkpoint64f, checkpoint63p, checkpoint63q, checkpoint63r, checkpoint63s, checkpoint63l, checkpoint63m, checkpoint63n, checkpoint63o, checkpoint63h, checkpoint63i, checkpoint63j, checkpoint63k, checkpoint63d, checkpoint63e, checkpoint63f, checkpoint63g, checkpoint63a, checkpoint63b, checkpoint63c, checkpoint64, checkpoint65, checkpoint60, checkpoint61, checkpoint62, checkpoint63, checkpoint66g, checkpoint66f, checkpoint66e, checkpoint66d, checkpoint66c, checkpoint66b, checkpoint66a, checkpoint66o, checkpoint66n, checkpoint66m, checkpoint66l, checkpoint66k, checkpoint66j, checkpoint66i, checkpoint66h, checkpoint65z, checkpoint65x, checkpoint65y, checkpoint65r, checkpoint65s, checkpoint65p, checkpoint65q, checkpoint65v, checkpoint65w, checkpoint65t, checkpoint65u, checkpoint65j, checkpoint65k, checkpoint65h, checkpoint65i, checkpoint65n, checkpoint65o, checkpoint65l, checkpoint65m, checkpoint65b, checkpoint65c, checkpoint65a, checkpoint65f, checkpoint65g, checkpoint65d, checkpoint65e, checkpoint59q, checkpoint59p, checkpoint59r, checkpoint59e, checkpoint59d, checkpoint59g, checkpoint59f, checkpoint59a, checkpoint59c, checkpoint59b, checkpoint59m, checkpoint59l, checkpoint59o, checkpoint59n, checkpoint59i, checkpoint59h, checkpoint59k, checkpoint59j, checkpoint59, checkpoint62c, checkpoint62b, checkpoint62a, checkpoint62g, checkpoint62f, checkpoint62e, checkpoint62d, checkpoint62k, checkpoint62j, checkpoint62i, checkpoint62h, checkpoint62o, checkpoint62n, checkpoint62m, checkpoint62l, checkpoint62s, checkpoint62r, checkpoint62q, checkpoint62p, checkpoint62w, checkpoint62v, checkpoint62u, checkpoint62t, checkpoint62z, checkpoint62y, checkpoint62x, checkpoint58y_post, checkpoint61f, checkpoint61g, checkpoint61d, checkpoint61e, checkpoint61b, checkpoint61c, checkpoint61a, checkpoint61n, checkpoint61o, checkpoint61l, checkpoint61m, checkpoint61j, checkpoint61k, checkpoint61h, checkpoint61i, checkpoint61v, checkpoint61w, checkpoint61t, checkpoint61u, checkpoint61r, checkpoint61s, checkpoint61p, checkpoint61q, checkpoint61z, checkpoint61x, checkpoint61y, HEAD
Changes since 1.6: +10 -8 lines 
add a logical argument "calcCFL" to DST horizontal Advection S/R
(if false, assume that uFld,vFld are already CFL number in x,y dir)
1 C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_dst2u1_adv_y.F,v 1.6 2006/12/05 22:21:50 jmc Exp $
2 C $Name: $
3
4 #include "GAD_OPTIONS.h"
5
6 CBOP
7 C !ROUTINE: GAD_DST2U1_ADV_Y
8
9 C !INTERFACE: ==========================================================
10 SUBROUTINE GAD_DST2U1_ADV_Y(
11 I bi,bj,k, advectionScheme, calcCFL,
12 I deltaTloc, vTrans, vFld,
13 I tracer,
14 O vT,
15 I myThid )
16
17 C !DESCRIPTION:
18 C Calculates the area integrated meridional flux due to advection
19 C of a tracer using second-order Direct Space and Time (DST-2)
20 C interpolation (=Lax-Wendroff) or simple 1rst order upwind scheme.
21
22 C !USES: ===============================================================
23 IMPLICIT NONE
24 #include "SIZE.h"
25 #include "GRID.h"
26 #include "GAD.h"
27
28 C !INPUT PARAMETERS: ===================================================
29 C bi,bj :: tile indices
30 C k :: vertical level
31 C advectionScheme :: advection scheme to use: either 2nd Order DST
32 C or 1rst Order Upwind
33 C calcCFL :: =T: calculate CFL number ; =F: take vFld as CFL
34 C deltaTloc :: local time-step (s)
35 C vTrans :: meridional volume transport
36 C vFld :: meridional flow / CFL number
37 C tracer :: tracer field
38 C myThid :: thread number
39 INTEGER bi,bj, k, advectionScheme
40 LOGICAL calcCFL
41 _RL deltaTloc
42 _RL vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
43 _RL vFld (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
44 _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
45 INTEGER myThid
46
47 C !OUTPUT PARAMETERS: ==================================================
48 C vT :: meridional advective flux
49 _RL vT (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
50
51 C !LOCAL VARIABLES: ====================================================
52 C i,j :: loop indices
53 C yLimit :: centered (vs upwind) fraction
54 C vCFL :: Courant-Friedrich-Levy number
55 INTEGER i,j
56 _RL vCFL, yLimit, vAbs
57 CEOP
58
59 yLimit = 0. _d 0
60 IF ( advectionScheme.EQ.ENUM_DST2 ) yLimit = 1. _d 0
61
62 DO i=1-Olx,sNx+Olx
63 vT(i,1-Oly)=0.
64 ENDDO
65 DO j=1-Oly+1,sNy+Oly
66 DO i=1-Olx,sNx+Olx
67
68 vCFL = vFld(i,j)
69 IF ( calcCFL ) vCFL = ABS( vFld(i,j)*deltaTloc
70 & *recip_dyC(i,j,bi,bj)*recip_deepFacC(k) )
71
72 c vT(i,j) =
73 c & vTrans(i,j)*(tracer(i,j-1)+tracer(i,j))*0.5 _d 0
74 c & + ( 1. _d 0 - yLimit*(1. _d 0 - vCFL) )*ABS(vTrans(i,j))
75 c & *(tracer(i,j-1)-tracer(i,j))*0.5 _d 0
76 C-- above formulation produces large truncation error when:
77 C 1rst.O upWind and v > 0 & |tracer(i,j-1)| << |tracer(i,j)|
78 C or v < 0 & |tracer(i,j-1)| >> |tracer(i,j)|
79 C-- change to a more robust expression:
80 vAbs = ABS(vTrans(i,j))
81 & *( 1. _d 0 - yLimit*(1. _d 0 - vCFL) )
82 vT(i,j) = ( vTrans(i,j)+vAbs )* 0.5 _d 0 * tracer(i,j-1)
83 & + ( vTrans(i,j)-vAbs )* 0.5 _d 0 * tracer(i,j)
84
85 ENDDO
86 ENDDO
87
88 RETURN
89 END
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