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C $Header: /u/gcmpack/MITgcm/model/src/update_cg2d.F,v 1.6 2004/07/09 22:32:35 jmc Exp $ |
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C $Name: $ |
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|
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: UPDATE_CG2D |
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C !INTERFACE: |
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SUBROUTINE UPDATE_CG2D( myTime, myIter, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE UPDATE_CG2D |
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C | o Update 2d conjugate gradient solver operators |
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C | account for Free-Surf effect on total column thickness |
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C *==========================================================* |
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C | This routine is based on INI_CG2D, and simplified. It is |
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C | only active when the non-linear free surface mode of |
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C | equations is active. |
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C *==========================================================* |
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C \ev |
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|
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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 "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "SURFACE.h" |
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#include "CG2D.h" |
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#ifdef ALLOW_OBCS |
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#include "OBCS.h" |
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#endif |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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C myTime - Current time in simulation |
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C myIter - Current iteration number in simulation |
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C myThid - Thread number for this instance of the routine. |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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|
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C !LOCAL VARIABLES: |
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#ifdef NONLIN_FRSURF |
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C-- Note : compared to "INI_CG2D", no needs to compute again |
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C the solver norn=malisation factor of the solver tolerance |
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C === Local variables === |
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C bi,bj :: tile indices |
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C I,J,K :: Loop counters |
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C faceArea :: Temporary used to hold cell face areas. |
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INTEGER bi, bj |
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INTEGER I, J, K, ks |
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_RL faceArea |
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_RL pW_tmp, pS_tmp |
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LOGICAL updatePreCond |
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CEOP |
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|
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C-- Decide when to update cg2d Preconditioner : |
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IF ( cg2dPreCondFreq.EQ.0 ) THEN |
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updatePreCond = .FALSE. |
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ELSE |
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updatePreCond = ( myIter.EQ.nIter0 ) |
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IF ( MOD(myIter,cg2dPreCondFreq).EQ.0 ) updatePreCond=.TRUE. |
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ENDIF |
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|
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C-- Initialise laplace operator |
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C aW2d: integral in Z Ax/dX |
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C aS2d: integral in Z Ay/dY |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO J=1,sNy+1 |
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DO I=1,sNx+1 |
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aW2d(I,J,bi,bj) = 0. _d 0 |
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aS2d(I,J,bi,bj) = 0. _d 0 |
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ENDDO |
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ENDDO |
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DO K=1,Nr |
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DO J=1,sNy+1 |
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DO I=1,sNx+1 |
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C deep-model: *deepFacC (faceArea), /deepFacC (recip_dx,y): => no net effect |
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faceArea = _dyG(I,J,bi,bj)*drF(K) |
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& *_hFacW(I,J,K,bi,bj) |
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aW2d(I,J,bi,bj) = aW2d(I,J,bi,bj) |
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& + faceArea*recip_dxC(I,J,bi,bj) |
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faceArea = _dxG(I,J,bi,bj)*drF(K) |
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& *_hFacS(I,J,K,bi,bj) |
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aS2d(I,J,bi,bj) = aS2d(I,J,bi,bj) |
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& + faceArea*recip_dyC(I,J,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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#ifdef ALLOW_OBCS |
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IF (useOBCS) THEN |
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C Note: would need loop from 1 to sNx+1 (and below, from 1 to sNy+1) |
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C to get the same solver-matrix as from INI_CG2D, |
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C since aS2d & aW2d are not exchanged here (but in INI_CG2D, they are). |
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DO I=1,sNx |
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IF (OB_Jn(I,bi,bj).NE.0) aS2d(I,OB_Jn(I,bi,bj),bi,bj)=0. |
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IF (OB_Jn(I,bi,bj).NE.0) aS2d(I,OB_Jn(I,bi,bj)+1,bi,bj)=0. |
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IF (OB_Js(I,bi,bj).NE.0) aS2d(I,OB_Js(I,bi,bj)+1,bi,bj)=0. |
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IF (OB_Js(I,bi,bj).NE.0) aS2d(I,OB_Js(I,bi,bj),bi,bj)=0. |
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ENDDO |
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DO J=1,sNy |
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IF (OB_Ie(J,bi,bj).NE.0) aW2d(OB_Ie(J,bi,bj),J,bi,bj)=0. |
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IF (OB_Ie(J,bi,bj).NE.0) aW2d(OB_Ie(J,bi,bj)+1,J,bi,bj)=0. |
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IF (OB_Iw(J,bi,bj).NE.0) aW2d(OB_Iw(J,bi,bj)+1,J,bi,bj)=0. |
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IF (OB_Iw(J,bi,bj).NE.0) aW2d(OB_Iw(J,bi,bj),J,bi,bj)=0. |
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ENDDO |
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ENDIF |
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#endif |
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DO J=1,sNy+1 |
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DO I=1,sNx+1 |
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aW2d(I,J,bi,bj) = aW2d(I,J,bi,bj)*cg2dNorm |
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& *implicSurfPress*implicDiv2DFlow |
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aS2d(I,J,bi,bj) = aS2d(I,J,bi,bj)*cg2dNorm |
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& *implicSurfPress*implicDiv2DFlow |
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ENDDO |
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ENDDO |
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C-- compute matrix main diagonal : |
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IF ( deepAtmosphere ) THEN |
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DO J=1,sNy |
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DO I=1,sNx |
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ks = ksurfC(I,J,bi,bj) |
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aC2d(I,J,bi,bj) = -( |
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& aW2d(I,J,bi,bj) + aW2d(I+1,J ,bi,bj) |
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& +aS2d(I,J,bi,bj) + aS2d(I ,J+1,bi,bj) |
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& +freeSurfFac*cg2dNorm*recip_Bo(I,J,bi,bj)*deepFac2F(ks) |
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& *rA(I,J,bi,bj)/deltaTMom/deltaTfreesurf |
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& ) |
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ENDDO |
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ENDDO |
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ELSE |
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DO J=1,sNy |
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DO I=1,sNx |
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aC2d(I,J,bi,bj) = -( |
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& aW2d(I,J,bi,bj) + aW2d(I+1,J ,bi,bj) |
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& +aS2d(I,J,bi,bj) + aS2d(I ,J+1,bi,bj) |
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& +freeSurfFac*cg2dNorm*recip_Bo(I,J,bi,bj) |
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& *rA(I,J,bi,bj)/deltaTMom/deltaTfreesurf |
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& ) |
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ENDDO |
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ENDDO |
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ENDIF |
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C- end bi,bj loops |
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ENDDO |
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ENDDO |
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|
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IF ( updatePreCond ) THEN |
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C-- Update overlap regions |
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CALL EXCH_XY_RS(aC2d, myThid) |
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|
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C-- Initialise preconditioner |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO J=1,sNy+1 |
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DO I=1,sNx+1 |
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IF ( aC2d(I,J,bi,bj) .EQ. 0. ) THEN |
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pC(I,J,bi,bj) = 1. _d 0 |
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ELSE |
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pC(I,J,bi,bj) = 1. _d 0 / aC2d(I,J,bi,bj) |
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ENDIF |
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pW_tmp = aC2d(I,J,bi,bj)+aC2d(I-1,J,bi,bj) |
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IF ( pW_tmp .EQ. 0. ) THEN |
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pW(I,J,bi,bj) = 0. |
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ELSE |
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pW(I,J,bi,bj) = |
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& -aW2d(I,J,bi,bj)/((cg2dpcOffDFac *pW_tmp)**2 ) |
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ENDIF |
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pS_tmp = aC2d(I,J,bi,bj)+aC2d(I,J-1,bi,bj) |
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IF ( pS_tmp .EQ. 0. ) THEN |
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pS(I,J,bi,bj) = 0. |
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ELSE |
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pS(I,J,bi,bj) = |
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& -aS2d(I,J,bi,bj)/((cg2dpcOffDFac *pS_tmp)**2 ) |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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C- if update Preconditioner : end |
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ENDIF |
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|
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#endif /* NONLIN_FRSURF */ |
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|
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RETURN |
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END |
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