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jmc |
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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_fluxlimit_adv_r.F,v 1.8 2004/03/29 03:33:51 edhill 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_R |
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C !INTERFACE: ========================================================== |
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SUBROUTINE GAD_DST2U1_ADV_R( |
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I bi,bj,k, advectionScheme, |
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I deltaTloc, rTrans, wVel, |
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I tracer, |
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O wT, |
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I myThid ) |
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C !DESCRIPTION: |
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C Calculates the area integrated vertical 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 deltaTloc :: local time-step (s) |
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C rTrans :: vertical volume transport |
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C wVel :: vertical 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 rTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL wVel (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,Nr) |
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INTEGER myThid |
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C !OUTPUT PARAMETERS: ================================================== |
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C wT :: vertical advective flux |
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_RL wT (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 km1 :: =max( k-1 , 1 ) |
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C rLimit :: centered (vs upwind) fraction |
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C wFld :: velocity, vertical component |
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C wCFL :: Courant-Friedrich-Levy number |
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INTEGER i,j,km1 |
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_RL wFld, wCFL, rLimit |
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CEOP |
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rLimit = 0. _d 0 |
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IF ( advectionScheme.EQ.ENUM_DST2 ) rLimit = 1. _d 0 |
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km1=MAX(1,k-1) |
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IF ( k.LE.1 .OR. k.GT.Nr) THEN |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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wT(i,j) = 0. |
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ENDDO |
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ENDDO |
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ELSE |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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c wFld = wVel(i,j,k,bi,bj) |
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wFld = rTrans(i,j)*recip_rA(i,j,bi,bj) |
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wCFL = ABS(wFld*deltaTloc*recip_drC(k)) |
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wT(i,j) = maskC(i,j,kM1,bi,bj)*( |
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& rTrans(i,j)*(Tracer(i,j,km1)+Tracer(i,j,k))*0.5 _d 0 |
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& + ( 1. _d 0 - rLimit*(1. _d 0 - wCFL) )*ABS(rTrans(i,j)) |
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& *(tracer(i,j,km1)-tracer(i,j,k))*0.5 _d 0*rkSign |
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& ) |
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ENDDO |
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ENDDO |
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ENDIF |
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RETURN |
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END |
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