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C $Header: /u/gcmpack/MITgcm/model/src/momentum_correction_step.F,v 1.1 2004/07/06 01:01:56 jmc Exp $ |
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C $Name: $ |
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_OPTIONS.h" |
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CBOP |
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C !ROUTINE: MOMENTUM_CORRECTION_STEP |
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C !INTERFACE: |
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SUBROUTINE MOMENTUM_CORRECTION_STEP(myTime, myIter, myThid) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE MOMENTUM_CORRECTION_STEP |
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C *==========================================================* |
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C |1rst Part : Update U,V. |
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C | |
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C | The arrays used for time stepping are cycled. |
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C | Momentum: |
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C | V(n) = Gv(n) - dt * grad Eta |
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C | |
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C |part1: update U,V |
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C | U*,V* (contained in gU,gV) have the surface |
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C | pressure gradient term added and the result stored |
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C | in U,V (contained in uVel, vVel) |
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C | |
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C |part2: Adjustments |
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C | o Filter U,V (Shapiro Filter, Zonal_Filter) |
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C | o Compute again Eta (exact volume conservation) |
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C | o Compute vertical velocity |
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C *==========================================================* |
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C \ev |
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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 "DYNVARS.h" |
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#ifdef ALLOW_SHAP_FILT |
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#include "SHAP_FILT.h" |
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#endif |
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#ifdef ALLOW_ZONAL_FILT |
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#include "ZONAL_FILT.h" |
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#endif |
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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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C !LOCAL VARIABLES: |
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C == Local variables |
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_RL phiSurfX(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL phiSurfY(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER iMin,iMax |
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INTEGER jMin,jMax |
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INTEGER bi,bj |
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INTEGER k,i,j |
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CEOP |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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C-- Set up work arrays that need valid initial values |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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phiSurfX(i,j)=0. |
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phiSurfY(i,j)=0. |
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ENDDO |
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ENDDO |
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C Loop range: Gradients of Eta are evaluated so valid |
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C range is all but first row and column in overlaps. |
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iMin = 1-OLx+1 |
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iMax = sNx+OLx |
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jMin = 1-OLy+1 |
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jMax = sNy+OLy |
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C- Calculate gradient of surface Potentiel |
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CALL CALC_GRAD_PHI_SURF( |
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I bi,bj,iMin,iMax,jMin,jMax, |
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I etaN, |
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O phiSurfX,phiSurfY, |
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I myThid ) |
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C-- Loop over all layers, top to bottom |
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DO K=1,Nr |
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C- Update velocity fields: V(n) = V** - dt * grad Eta |
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IF (momStepping) |
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& CALL CORRECTION_STEP( |
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I bi,bj,iMin,iMax,jMin,jMax,K, |
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I phiSurfX,phiSurfY,myTime,myThid ) |
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#ifdef ALLOW_OBCS |
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IF (useOBCS) THEN |
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CALL OBCS_APPLY_UV(bi,bj,K,uVel,vVel,myThid) |
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ENDIF |
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#endif /* ALLOW_OBCS */ |
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C-- End DO K=1,Nr |
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ENDDO |
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C-- End of 1rst bi,bj loop |
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ENDDO |
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ENDDO |
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C--- 2nd Part : Adjustment. |
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C-- Filter (and exchange) |
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#ifdef ALLOW_SHAP_FILT |
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IF (useSHAP_FILT) THEN |
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IF ( .NOT.shap_filt_uvStar ) THEN |
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CALL TIMER_START('SHAP_FILT_UV [MOM_CORR_STEP]',myThid) |
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CALL SHAP_FILT_APPLY_UV( uVel, vVel, myTime, myIter, myThid ) |
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CALL TIMER_STOP ('SHAP_FILT_UV [MOM_CORR_STEP]',myThid) |
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ENDIF |
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ENDIF |
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#endif |
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#ifdef ALLOW_ZONAL_FILT |
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IF (useZONAL_FILT) THEN |
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IF ( .NOT.zonal_filt_uvStar ) THEN |
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CALL TIMER_START('ZONAL_FILT_UV [MOM_CORR_STEP]',myThid) |
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CALL ZONAL_FILT_APPLY_UV( uVel, vVel, myThid ) |
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CALL TIMER_STOP ('ZONAL_FILT_UV [MOM_CORR_STEP]',myThid) |
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ENDIF |
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ENDIF |
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#endif |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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C-- Integrate continuity vertically |
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C-- for vertical velocity and "etaN" (exact volume conservation) : |
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CALL INTEGR_CONTINUITY( bi, bj, uVel, vVel, |
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I myTime, myIter, myThid ) |
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C-- End of 2nd bi,bj loop |
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ENDDO |
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ENDDO |
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IF ( exactConserv .AND. implicDiv2Dflow .NE. 0. _d 0) |
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& _EXCH_XY_R8( etaN , myThid ) |
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RETURN |
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END |
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