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jmc |
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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_fluxlimit_adv_x.F,v 1.6 2005/08/19 22:19:35 heimbach Exp $ |
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C $Name: $ |
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#include "GAD_OPTIONS.h" |
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CBOP |
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C !ROUTINE: GAD_DST2U1_ADV_X |
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C !INTERFACE: ========================================================== |
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SUBROUTINE GAD_DST2U1_ADV_X( |
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I bi,bj,k, advectionScheme, |
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I deltaTloc, uTrans, uVel, |
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I tracer, |
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O uT, |
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I myThid ) |
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C !DESCRIPTION: |
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C Calculates the area integrated zonal flux due to advection |
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C of a tracer using second-order Direct Space and Time (DST-2) |
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C interpolation (=Lax-Wendroff) or simple 1rst order upwind scheme. |
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C !USES: =============================================================== |
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IMPLICIT NONE |
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#include "SIZE.h" |
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#include "GRID.h" |
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#include "GAD.h" |
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C !INPUT PARAMETERS: =================================================== |
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C bi,bj :: tile indices |
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C k :: vertical level |
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C advectionScheme :: advection scheme to use: either 2nd Order DST |
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C or 1rst Order Upwind |
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C uTrans :: zonal volume transport |
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C uVel :: zonal flow |
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C tracer :: tracer field |
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C myThid :: thread number |
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INTEGER bi,bj,k |
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INTEGER advectionScheme |
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_RL deltaTloc |
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_RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL uVel (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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C !OUTPUT PARAMETERS: ================================================== |
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C uT :: zonal advective flux |
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_RL uT (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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C !LOCAL VARIABLES: ==================================================== |
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C i,j :: loop indices |
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C rLimit :: centered (vs upwind) fraction |
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C uFld :: velocity [m/s], zonal component |
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C uCFL :: Courant-Friedrich-Levy number |
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INTEGER i,j |
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_RL uFld, uCFL, xLimit |
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CEOP |
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xLimit = 0. _d 0 |
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IF ( advectionScheme.EQ.ENUM_DST2 ) xLimit = 1. _d 0 |
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DO j=1-Oly,sNy+Oly |
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uT(1-Olx,j)=0. |
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DO i=1-Olx+1,sNx+Olx |
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c uFld = uVel(i,j,k,bi,bj) |
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uFld = uTrans(i,j)*recip_dyG(i,j,bi,bj) |
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& *recip_drF(k)*recip_hFacW(i,j,k,bi,bj) |
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uCFL = ABS(uFld*deltaTloc*recip_dxC(i,j,bi,bj)) |
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uT(i,j) = |
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& uTrans(i,j)*(Tracer(i-1,j)+Tracer(i,j))*0.5 _d 0 |
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& + ( 1. _d 0 - xLimit*(1. _d 0 - uCFL) )*ABS(uTrans(i,j)) |
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& *(tracer(i-1,j)-tracer(i,j))*0.5 _d 0 |
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ENDDO |
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ENDDO |
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RETURN |
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END |
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