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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_dst2u1_adv_x.F,v 1.6 2006/12/05 22:21:50 jmc 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_SOM_LIM_R |
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C !INTERFACE: ========================================================== |
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SUBROUTINE GAD_SOM_LIM_R( |
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I bi,bj, limiter, |
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U sm_v, sm_o, sm_x, sm_y, sm_z, |
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U sm_xx, sm_yy, sm_zz, sm_xy, sm_xz, sm_yz, |
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I myThid ) |
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C !DESCRIPTION: |
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C Apply limiter before calculating vertical advection |
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C Second-Order Moments Advection of tracer in Z-direction |
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C ref: M.J.Prather, 1986, JGR, 91, D6, pp 6671-6681. |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C !USES: =============================================================== |
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IMPLICIT NONE |
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#include "SIZE.h" |
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c #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 limiter :: 0: no limiter ; 1: Prather, 1986 limiter |
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C myThid :: my Thread Id. number |
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INTEGER bi,bj |
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INTEGER limiter |
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c _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 sm_v :: volume of grid cell |
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C sm_o :: tracer content of grid cell (zero order moment) |
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C sm_x,y,z :: 1rst order moment of tracer distribution, in x,y,z direction |
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C sm_xx,yy,zz :: 2nd order moment of tracer distribution, in x,y,z direction |
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C sm_xy,xz,yz :: 2nd order moment of tracer distr., in cross direction xy,xz,yz |
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_RL sm_v (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_o (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_x (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_y (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_z (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_xx (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_yy (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_zz (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_xy (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_xz (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL sm_yz (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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#ifdef GAD_ALLOW_SOM_ADVECT |
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C !LOCAL VARIABLES: ==================================================== |
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C i,j,k :: loop indices |
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_RL three |
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PARAMETER( three = 3. _d 0 ) |
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INTEGER i,j,k |
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_RL slpmax, s1max, s1new, s2new |
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CEOP |
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IF ( limiter.EQ.1 ) THEN |
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DO k=1,Nr |
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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 If flux-limiting transport is to be applied, place limits on |
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C appropriate moments before transport. |
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slpmax = 0. |
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IF ( sm_o(i,j,k).GT.0. ) slpmax = sm_o(i,j,k) |
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s1max = slpmax*1.5 _d 0 |
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s1new = MIN( s1max, MAX(-s1max,sm_z(i,j,k)) ) |
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s2new = MIN( (slpmax+slpmax-ABS(s1new)/three), |
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& MAX(ABS(s1new)-slpmax,sm_zz(i,j,k)) ) |
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sm_xz(i,j,k) = MIN( slpmax, MAX(-slpmax,sm_xz(i,j,k)) ) |
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sm_yz(i,j,k) = MIN( slpmax, MAX(-slpmax,sm_yz(i,j,k)) ) |
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sm_z (i,j,k) = s1new ; |
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sm_zz(i,j,k) = s2new ; |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDIF |
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#endif /* GAD_ALLOW_SOM_ADVECT */ |
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RETURN |
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END |
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