| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_dst2u1_impl_r.F,v 1.2 2006/06/07 01:55:14 heimbach Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "GAD_OPTIONS.h" |
| 5 |
|
| 6 |
CBOP |
| 7 |
C !ROUTINE: GAD_DST2U1_IMPL_R |
| 8 |
C !INTERFACE: |
| 9 |
SUBROUTINE GAD_DST2U1_IMPL_R( |
| 10 |
I bi,bj,k, iMin,iMax,jMin,jMax, |
| 11 |
I advectionScheme, deltaTarg, rTrans, recip_hFac, |
| 12 |
O a3d, b3d, c3d, |
| 13 |
I myThid ) |
| 14 |
|
| 15 |
C !DESCRIPTION: |
| 16 |
C Compute matrix element to solve vertical advection implicitly |
| 17 |
C using DST 2nd.Order (=Lax-Wendroff) or 1rst Order Upwind scheme. |
| 18 |
C Method: |
| 19 |
C contribution of vertical transport at interface k is added |
| 20 |
C to matrix lines k and k-1. |
| 21 |
|
| 22 |
C !USES: |
| 23 |
IMPLICIT NONE |
| 24 |
|
| 25 |
C == Global variables === |
| 26 |
#include "SIZE.h" |
| 27 |
#include "GRID.h" |
| 28 |
#include "GAD.h" |
| 29 |
|
| 30 |
C !INPUT/OUTPUT PARAMETERS: |
| 31 |
C == Routine Arguments == |
| 32 |
C bi,bj :: tile indices |
| 33 |
C k :: vertical level |
| 34 |
C advectionScheme :: advection scheme to use: either 2nd Order DST |
| 35 |
C or 1rst Order Upwind |
| 36 |
C iMin,iMax :: computation domain |
| 37 |
C jMin,jMax :: computation domain |
| 38 |
C deltaTarg :: time step |
| 39 |
C rTrans :: vertical volume transport |
| 40 |
C recip_hFac :: inverse of cell open-depth factor |
| 41 |
C a3d :: lower diagonal of the tridiagonal matrix |
| 42 |
C b3d :: main diagonal of the tridiagonal matrix |
| 43 |
C c3d :: upper diagonal of the tridiagonal matrix |
| 44 |
C myThid :: thread number |
| 45 |
INTEGER bi,bj,k |
| 46 |
INTEGER iMin,iMax,jMin,jMax |
| 47 |
INTEGER advectionScheme |
| 48 |
_RL deltaTarg(Nr) |
| 49 |
_RL rTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 50 |
_RS recip_hFac(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
| 51 |
_RL a3d (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
| 52 |
_RL b3d (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
| 53 |
_RL c3d (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
| 54 |
INTEGER myThid |
| 55 |
|
| 56 |
C == Local Variables == |
| 57 |
C i,j :: loop indices |
| 58 |
C w_CFL :: Courant-Friedrich-Levy number |
| 59 |
C rLimit :: centered (vs upwind) fraction |
| 60 |
C rCenter :: centered contribution |
| 61 |
C rUpwind :: upwind contribution |
| 62 |
INTEGER i,j |
| 63 |
_RL w_CFL, rLimit |
| 64 |
_RL rCenter, rUpwind |
| 65 |
_RL deltaTcfl |
| 66 |
|
| 67 |
CEOP |
| 68 |
|
| 69 |
rLimit = 0. _d 0 |
| 70 |
IF ( advectionScheme.EQ.ENUM_DST2 ) rLimit = 1. _d 0 |
| 71 |
|
| 72 |
C-- process interior interface only: |
| 73 |
IF ( k.GT.1 .AND. k.LE.Nr ) THEN |
| 74 |
|
| 75 |
C-- Add centered & upwind contributions |
| 76 |
deltaTcfl = deltaTarg(k) |
| 77 |
DO j=jMin,jMax |
| 78 |
DO i=iMin,iMax |
| 79 |
w_CFL = deltaTcfl*ABS(rTrans(i,j)) |
| 80 |
& *recip_rA(i,j,bi,bj)*recip_drC(k) |
| 81 |
rCenter = 0.5 _d 0 *rTrans(i,j)*recip_rA(i,j,bi,bj)*rkSign |
| 82 |
rUpwind = ABS(rCenter) |
| 83 |
& * ( 1. _d 0 - rLimit ) |
| 84 |
c & * ( 1. _d 0 - rLimit*( 1. _d 0 + w_CFL ) ) |
| 85 |
a3d(i,j,k) = a3d(i,j,k) |
| 86 |
& - (rCenter+rUpwind)*deltaTarg(k) |
| 87 |
& *recip_hFac(i,j,k)*recip_drF(k) |
| 88 |
b3d(i,j,k) = b3d(i,j,k) |
| 89 |
& - (rCenter-rUpwind)*deltaTarg(k) |
| 90 |
& *recip_hFac(i,j,k)*recip_drF(k) |
| 91 |
b3d(i,j,k-1) = b3d(i,j,k-1) |
| 92 |
& + (rCenter+rUpwind)*deltaTarg(k-1) |
| 93 |
& *recip_hFac(i,j,k-1)*recip_drF(k-1) |
| 94 |
c3d(i,j,k-1) = c3d(i,j,k-1) |
| 95 |
& + (rCenter-rUpwind)*deltaTarg(k-1) |
| 96 |
& *recip_hFac(i,j,k-1)*recip_drF(k-1) |
| 97 |
ENDDO |
| 98 |
ENDDO |
| 99 |
|
| 100 |
C-- process interior interface only: end |
| 101 |
ENDIF |
| 102 |
|
| 103 |
RETURN |
| 104 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph