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C $Header: /u/gcmpack/MITgcm/model/src/calc_div_ghat.F,v 1.26 2009/11/30 16:26:48 jmc Exp $ |
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C $Name: $ |
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|
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#include "CPP_OPTIONS.h" |
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|
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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,k, |
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U cg2d_b, cg3d_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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|
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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 "DYNVARS.h" |
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#ifdef ALLOW_ADDFLUID |
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# include "FFIELDS.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 bi, bj :: tile indices |
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C k :: Index of layer. |
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C cg2d_b :: Conjugate Gradient 2-D solver : Right-hand side vector |
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C cg3d_b :: Conjugate Gradient 3-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 |
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INTEGER k |
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_RL cg2d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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#ifdef ALLOW_NONHYDROSTATIC |
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_RL cg3d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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#else |
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_RL cg3d_b(1) |
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#endif |
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INTEGER myThid |
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|
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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 xA, yA :: Cell vertical face areas |
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C pf :: Intermediate array for building RHS source term. |
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INTEGER i,j |
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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 pf (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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CEOP |
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|
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C Calculate vertical face areas |
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DO j=1,sNy+1 |
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DO i=1,sNx+1 |
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xA(i,j) = _dyG(i,j,bi,bj)*deepFacC(k) |
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& *drF(k)*_hFacW(i,j,k,bi,bj)*rhoFacC(k) |
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yA(i,j) = _dxG(i,j,bi,bj)*deepFacC(k) |
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& *drF(k)*_hFacS(i,j,k,bi,bj)*rhoFacC(k) |
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ENDDO |
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ENDDO |
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|
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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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|
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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#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 U uVel( 1-OLx,1-OLy,k,bi,bj), |
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c I hFacW(1-OLx,1-OLy,k,bi,bj), |
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c I 0, sNy+1, 1, bi, bj, 1, myThid ) |
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c CALL ZONAL_FILTER( |
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c U vVel( 1-OLx,1-OLy,k,bi,bj), |
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c I hFacS(1-OLx,1-OLy,k,bi,bj), |
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c I 0, sNy+1, 1, 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. _d 0-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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|
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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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|
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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. _d 0-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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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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|
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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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|
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#ifdef ALLOW_ADDFLUID |
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IF ( selectAddFluid.GE.1 ) THEN |
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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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& - addMass(i,j,k,bi,bj)*mass2rUnit/deltaTMom |
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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) = cg3d_b(i,j,k,bi,bj) |
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& - addMass(i,j,k,bi,bj)*mass2rUnit/deltaTMom |
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ENDDO |
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ENDDO |
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ENDIF |
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#endif |
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ENDIF |
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#endif /* ALLOW_ADDFLUID */ |
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|
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RETURN |
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END |
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