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edhill |
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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_c2_impl_r.F,v 1.1 2004/01/07 21:37:59 jmc Exp $ |
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jmc |
1.1 |
C $Name: $ |
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#include "GAD_OPTIONS.h" |
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CBOP |
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C !ROUTINE: GAD_C2_IMPL_R |
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C !INTERFACE: |
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SUBROUTINE GAD_C2_IMPL_R( |
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I bi,bj,k, iMin,iMax,jMin,jMax, |
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I deltaTarg, rTrans, |
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O a3d, b3d, c3d, |
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I myThid ) |
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edhill |
1.2 |
C !DESCRIPTION: |
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C Compute matrix element to solve vertical advection implicitly |
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C using centered second-order scheme The contribution of vertical |
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C transport at interface k is added to matrix lines k and k-1. |
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jmc |
1.1 |
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C !USES: |
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IMPLICIT NONE |
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C == Global variables === |
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#include "SIZE.h" |
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#include "GRID.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine Arguments == |
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edhill |
1.2 |
C bi,bj :: tile indices |
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C k :: vertical level |
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C iMin,iMax :: computation domain |
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C jMin,jMax :: computation domain |
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C deltaTarg :: time step |
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C rTrans :: vertical volume transport |
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C a3d :: lower diagonal of the tridiagonal matrix |
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C b3d :: main diagonal of the tridiagonal matrix |
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C c3d :: upper diagonal of the tridiagonal matrix |
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C myThid :: thread number |
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jmc |
1.1 |
INTEGER bi,bj,k |
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INTEGER iMin,iMax,jMin,jMax |
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_RL deltaTarg |
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_RL rTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL a3d (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL b3d (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL c3d (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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INTEGER myThid |
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C == Local Variables == |
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edhill |
1.2 |
C i,j :: loop indices |
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C rCenter :: centered contribution |
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jmc |
1.1 |
INTEGER i,j |
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_RL rCenter |
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CEOP |
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IF ( k.GT.Nr .OR. k.LT.2 ) RETURN |
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C-- Add centered contribution |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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rCenter = 0.5 _d 0 *deltaTarg*rTrans(i,j) |
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& *recip_rA(i,j,bi,bj)*rkFac |
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a3d(i,j,k) = a3d(i,j,k) |
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& + rCenter |
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& *recip_hFacC(i,j,k,bi,bj)*recip_drF(k) |
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b3d(i,j,k) = b3d(i,j,k) |
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& + rCenter |
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& *recip_hFacC(i,j,k,bi,bj)*recip_drF(k) |
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b3d(i,j,k-1) = b3d(i,j,k-1) |
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& - rCenter |
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& *recip_hFacC(i,j,k-1,bi,bj)*recip_drF(k-1) |
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c3d(i,j,k-1) = c3d(i,j,k-1) |
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& - rCenter |
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& *recip_hFacC(i,j,k-1,bi,bj)*recip_drF(k-1) |
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ENDDO |
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ENDDO |
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RETURN |
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END |
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