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C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep.F,v 1.18.2.4 2001/01/17 20:58:42 jmc Exp $ |
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#include "CPP_OPTIONS.h" |
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|
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C /==========================================================\ |
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C | S/R TIMESTEP | |
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C | o Step model fields forward in time | |
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C \==========================================================/ |
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SUBROUTINE TIMESTEP( bi, bj, iMin, iMax, jMin, jMax, |
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I K, phiHyd, |
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I myIter, myThid ) |
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implicit none |
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|
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C == Global variables == |
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#include "SIZE.h" |
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#include "DYNVARS.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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|
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C == Routine Arguments == |
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C phiHyd - Hydrostatic pressure (ocean) or geopotentiel (atmos) |
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INTEGER bi,bj,iMin,iMax,jMin,jMax |
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INTEGER K |
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_RL phiHyd(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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INTEGER myIter, myThid |
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|
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C == Local variables == |
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INTEGER i,j |
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_RL ab15,ab05 |
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_RL phxFac,phyFac |
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|
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C Adams-Bashforth timestepping weights |
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Caja IF (myIter .EQ. 0) THEN |
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Caja ab15=1.0 |
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Caja ab05=0.0 |
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Caja ELSE |
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ab15=1.5+abeps |
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ab05=-0.5-abeps |
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Caja ENDIF |
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|
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C Step forward zonal velocity (store in Gu) |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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gUNm1(i,j,k,bi,bj)=uVel(i,j,k,bi,bj) |
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& +deltaTmom*(ab15*gU(i,j,k,bi,bj)+ab05*gUNm1(i,j,k,bi,bj) |
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#ifdef INCLUDE_CD_CODE |
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& +guCD(i,j,k,bi,bj) |
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#endif |
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& )*_maskW(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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|
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IF (staggerTimeStep) THEN |
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C-- -grad Phi_Hyd has not been incorporated to gU and is added here: |
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phxFac = pfFacMom*deltaTmom*recip_rhoConst |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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gUNm1(i,j,k,bi,bj)=gUNm1(i,j,k,bi,bj) |
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& - _recip_dxC(i,j,bi,bj) |
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& *(phiHyd(i,j,k)-phiHyd(i-1,j,k))*phxFac |
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& *_maskW(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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C Step forward meridional velocity (store in Gv) |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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gVNm1(i,j,k,bi,bj)=vVel(i,j,k,bi,bj) |
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& +deltaTmom*(ab15*gV(i,j,k,bi,bj)+ab05*gVNm1(i,j,k,bi,bj) |
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#ifdef INCLUDE_CD_CODE |
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& +gvCD(i,j,k,bi,bj) |
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#endif |
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& )*_maskS(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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|
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IF (staggerTimeStep) THEN |
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C-- -grad Phi_Hyd has not been incorporated to gV and is added here: |
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phyFac = pfFacMom*deltaTmom*recip_rhoConst |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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gVNm1(i,j,k,bi,bj)=gVNm1(i,j,k,bi,bj) |
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& - _recip_dyC(i,j,bi,bj) |
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& *(phiHyd(i,j,k)-phiHyd(i,j-1,k))*phyFac |
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& *_maskS(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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RETURN |
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END |
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