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C $Header: /u/gcmpack/MITgcm/model/src/calc_div_ghat.F,v 1.20 2004/04/06 00:31:54 jmc Exp $ |
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C $Name: $ |
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#include "CPP_OPTIONS.h" |
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edhill |
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CBOP |
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C !ROUTINE: CALC_DIV_GHAT |
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C !INTERFACE: |
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SUBROUTINE CALC_DIV_GHAT( |
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I bi,bj,iMin,iMax,jMin,jMax,k, |
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1.1 |
I xA,yA, |
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U cg2d_b, |
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I myThid) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R CALC_DIV_GHAT |
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C | o Form the right hand-side of the surface pressure eqn. |
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C *==========================================================* |
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C | Right hand side of pressure equation is divergence |
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C | of veclocity tendency (GHAT) term along with a relaxation |
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C | term equal to the barotropic flow field divergence. |
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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 "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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#include "SOLVE_FOR_PRESSURE3D.h" |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C bi, bj :: tile indices |
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C iMin, iMax, jMin, jMax :: Range of points for which calculation |
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C results will be set. |
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C k :: Index of layer. |
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C xA, yA :: Cell face areas |
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C cg2d_b :: Conjugate Gradient 2-D solver : Right-hand side vector |
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C myThid :: Instance number for this call of CALC_DIV_GHAT |
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INTEGER bi,bj, iMin,iMax,jMin,jMax |
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INTEGER k |
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_RS xA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL cg2d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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INTEGER myThid |
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C i,j :: Loop counters |
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C pf :: Intermediate array for building RHS source term. |
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INTEGER i,j |
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_RL pf (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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CEOP |
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C-- Pressure equation source term |
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C Term is the vertical integral of the divergence of the |
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C time tendency terms along with a relaxation term that |
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C pulls div(U) + dh/dt back toward zero. |
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IF (implicDiv2Dflow.EQ.1.) THEN |
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C Fully Implicit treatment of the Barotropic Flow Divergence |
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DO j=1,sNy |
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DO i=1,sNx+1 |
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pf(i,j) = xA(i,j)*gU(i,j,k,bi,bj) / deltaTmom |
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ENDDO |
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ENDDO |
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ELSEIF (exactConserv) THEN |
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c ELSEIF (nonlinFreeSurf.GT.0) THEN |
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C Implicit treatment of the Barotropic Flow Divergence |
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DO j=1,sNy |
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DO i=1,sNx+1 |
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pf(i,j) = implicDiv2Dflow |
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& *xA(i,j)*gU(i,j,k,bi,bj) / deltaTmom |
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ENDDO |
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ENDDO |
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ELSE |
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C Explicit+Implicit part of the Barotropic Flow Divergence |
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C => Filtering of uVel,vVel is necessary |
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C-- Now the filter are applied in the_correction_step(). |
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C We have left this code here to indicate where the filters used to be |
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C in the algorithm before JMC moved them to after the pressure solver. |
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C- |
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C#ifdef ALLOW_ZONAL_FILT |
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C IF (zonal_filt_lat.LT.90.) THEN |
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C CALL ZONAL_FILTER( |
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C & uVel, hFacW, 1-1, sNy+1, k, k, bi, bj, 1, myThid) |
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C CALL ZONAL_FILTER( |
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C & vVel, hFacS, 1-1, sNy+1, k, k, bi, bj, 2, myThid) |
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C ENDIF |
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C#endif |
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DO j=1,sNy |
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DO i=1,sNx+1 |
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pf(i,j) = ( implicDiv2Dflow * gU(i,j,k,bi,bj) |
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& + (1.-implicDiv2Dflow) * uVel(i,j,k,bi,bj) |
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& ) * xA(i,j) / deltaTmom |
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ENDDO |
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ENDDO |
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ENDIF |
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DO j=1,sNy |
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DO i=1,sNx |
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cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj) + |
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& pf(i+1,j)-pf(i,j) |
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ENDDO |
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ENDDO |
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#ifdef ALLOW_NONHYDROSTATIC |
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IF (use3Dsolver) THEN |
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DO j=1,sNy |
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DO i=1,sNx |
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cg3d_b(i,j,k,bi,bj) = pf(i+1,j)-pf(i,j) |
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ENDDO |
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ENDDO |
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ENDIF |
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#endif |
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IF (implicDiv2Dflow.EQ.1.) THEN |
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C Fully Implicit treatment of the Barotropic Flow Divergence |
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DO j=1,sNy+1 |
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DO i=1,sNx |
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pf(i,j) = yA(i,j)*gV(i,j,k,bi,bj) / deltatmom |
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ENDDO |
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ENDDO |
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ELSEIF (exactConserv) THEN |
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c ELSEIF (nonlinFreeSurf.GT.0) THEN |
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C Implicit treatment of the Barotropic Flow Divergence |
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DO j=1,sNy+1 |
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DO i=1,sNx |
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pf(i,j) = implicDiv2Dflow |
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& *yA(i,j)*gV(i,j,k,bi,bj) / deltatmom |
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ENDDO |
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ENDDO |
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ELSE |
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C Explicit+Implicit part of the Barotropic Flow Divergence |
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DO j=1,sNy+1 |
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DO i=1,sNx |
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pf(i,j) = ( implicDiv2Dflow * gV(i,j,k,bi,bj) |
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& + (1.-implicDiv2Dflow) * vVel(i,j,k,bi,bj) |
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& ) * yA(i,j) / deltaTmom |
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ENDDO |
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ENDDO |
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ENDIF |
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1.1 |
DO j=1,sNy |
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DO i=1,sNx |
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cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj) + |
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& pf(i,j+1)-pf(i,j) |
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ENDDO |
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ENDDO |
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adcroft |
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#ifdef ALLOW_NONHYDROSTATIC |
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IF (use3Dsolver) THEN |
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DO j=1,sNy |
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DO i=1,sNx |
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cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj) + |
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& pf(i,j+1)-pf(i,j) |
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ENDDO |
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ENDDO |
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ENDIF |
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#endif |
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RETURN |
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END |
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