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C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_calc_hdiv.F,v 1.1 2004/05/24 18:40:57 adcroft Exp $ |
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C $Name: $ |
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|
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#include "MOM_COMMON_OPTIONS.h" |
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|
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SUBROUTINE MOM_CALC_HDIV( |
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I bi,bj,k, hDivScheme, |
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I uFld, vFld, |
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O hDiv, |
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I myThid) |
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IMPLICIT NONE |
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C /==========================================================\ |
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C | S/R MOM_CALC_HDIV | |
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C |==========================================================| |
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C \==========================================================/ |
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|
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C == Global variables == |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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C == Routine arguments == |
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C myThid - Instance number for this innvocation of CALC_MOM_RHS |
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INTEGER bi,bj,k,hDivScheme |
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_RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL hDiv(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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|
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C == Local variables == |
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INTEGER i,j |
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|
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IF (hDivScheme.EQ.1) THEN |
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DO J=1-Oly,sNy+Oly-1 |
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DO I=1-Olx,sNx+Olx-1 |
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C This discretization is the straight forward horizontal divergence |
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C that only considers the horizontal grid variations. |
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hDiv(I,J)=( |
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& uFld(i+1, j )*dyg(i+1, j ,bi,bj) |
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& -uFld( i , j )*dyg( i , j ,bi,bj) |
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& +vFld( i ,j+1)*dxg( i ,j+1,bi,bj) |
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& -vFld( i , j )*dxg( i , j ,bi,bj) |
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& )*recip_rA(I,J,bi,bj) |
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ENDDO |
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ENDDO |
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|
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ELSEIF (hDivScheme.EQ.2) THEN |
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DO J=1-Oly,sNy+Oly-1 |
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DO I=1-Olx,sNx+Olx-1 |
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C This discretization takes into account the fractional areas |
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C due to the lopping. Whether we should do this is not clear! |
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hDiv(I,J)= |
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& ( ( uFld(i+1, j )*dyg(i+1, j ,bi,bj)*hFacW(i+1, j ,K,bi,bj) |
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& -uFld( i , j )*dyg( i , j ,bi,bj)*hFacW( i , j ,K,bi,bj) ) |
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& +( vFld( i ,j+1)*dxg( i ,j+1,bi,bj)*hFacS( i ,j+1,K,bi,bj) |
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& -vFld( i , j )*dxg( i , j ,bi,bj)*hFacS( i , j ,K,bi,bj) ) |
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& )*recip_rA(I,J,bi,bj) |
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& *recip_hFacC(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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|
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ELSE |
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STOP 'S/R MOM_CALC_HDIV: We should never reach this point!' |
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ENDIF |
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|
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RETURN |
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END |
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