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C $Header: /u/gcmpack/MITgcm_contrib/ksnow/press_release/code/adjust_ghat_press_release.F,v 1.2 2017/02/05 19:08:18 dgoldberg Exp $ |
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C $Name: $ |
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|
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#include "CPP_OPTIONS.h" |
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#ifdef ALLOW_PRESSURE_RELEASE_CODE |
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# include "SHELFICE_OPTIONS.h" |
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#endif |
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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 ADJUST_GHAT_PRESS_RELEASE( |
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U cg2d_b,bi,bj, |
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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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#include "SURFACE.h" |
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#ifdef ALLOW_ADDFLUID |
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# include "FFIELDS.h" |
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#endif |
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#ifdef ALLOW_PRESSURE_RELEASE_CODE |
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# include "SHELFICE.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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_RL cg2d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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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, k, km1 |
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_RL pf (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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#ifdef ALLOW_PRESSURE_RELEASE_CODE |
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_RL curPrelVisc, avgGrd |
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_RL depth, eff_depth, pinit, phiLow, phiLowM1 |
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#endif |
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CEOP |
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|
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#ifdef ALLOW_PRESSURE_RELEASE_CODE |
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#ifndef ALLOW_NONHYDROSTATIC |
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|
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IF (implicDiv2Dflow.EQ.1) THEN |
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|
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C Calculate vertical face areas |
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! xA(i,j) = _dyG(i,j,bi,bj)*depthColW(i,j,bi,bj)*rhoFacC(k) |
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! yA(i,j) = _dxG(i,j,bi,bj)*depthColS(i,j,bi,bj)*rhoFacC(k) |
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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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_EXCH_XY_RL (phi0surf,mythid) |
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|
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DO j=1,sNy+1 |
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DO i=1,sNx+1 |
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pf(i,j)=0.0 |
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ENDDO |
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ENDDO |
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DO j=1,sNy |
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DO i=1,sNx+1 |
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IF (maskInC(i,j,bi,bj)*maskInC(i-1,j,bi,bj).eq.1.) THEN |
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! pf(i,j) = xA(i,j)*gU(i,j,k,bi,bj) / deltaTMom |
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depth = depthColW(i,j,bi,bj) |
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IF (depth.lt.cg2dminColumnEps) THEN |
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|
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phiLow = phiHydLowC (i,j,bi,bj) |
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phiLowM1 = phiHydLowC (i-1,j,bi,bj) |
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|
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avgGrd = min (grdFactor(i,j,bi,bj),grdFactor(i-1,j,bi,bj)) |
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curPrelVisc = max((0.55+avgGrd*0.45),0. _d 0)*pReleaseVisc |
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|
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eff_depth = cg2dminColumnEps - |
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& 2. * cg2dminColumnEps / PI * |
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& COS (PI * depth / (2.*cg2dminColumnEps)) |
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|
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pinit = -1. * curPrelVisc * |
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& _recip_dxC(i,j,bi,bj) * _dyG(i,j,bi,bj) |
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& *(phi0surf(i,j,bi,bj)-phi0surf(i-1,j,bi,bj)+ |
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& phiLow-phiLowM1) |
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& /deltaTmom |
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|
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|
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|
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! pinit = -1. * pReleaseVisc * |
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! & _recip_dxC(i,j,bi,bj) * _dyG(i,j,bi,bj) |
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! & *(phiLow-phiLowM1) |
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! & /deltaTmom |
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|
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pf(i,j) = pinit * (eff_depth - depth) |
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|
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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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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! call write_fld_xy_rl('cg2db_1a','',cg2d_b,0,mythid) |
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|
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DO j=1,sNy+1 |
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DO i=1,sNx+1 |
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pf(i,j)=0.0 |
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ENDDO |
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ENDDO |
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|
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DO j=1,sNy+1 |
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DO i=1,sNx |
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IF (maskInC(i,j,bi,bj)*maskInC(i,j-1,bi,bj).eq.1.) THEN |
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! pf(i,j) = xA(i,j)*gU(i,j,k,bi,bj) / deltaTMom |
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depth = depthColS(i,j,bi,bj) |
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IF (depth.lt.cg2dminColumnEps) THEN |
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|
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phiLow = phiHydLowC (i,j,bi,bj) |
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phiLowM1 = phiHydLowC (i,j-1,bi,bj) |
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|
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avgGrd = min (grdFactor(i,j,bi,bj),grdFactor(i,j-1,bi,bj)) |
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curPrelVisc = max((0.55+avgGrd*0.45),0. _d 0)*pReleaseVisc |
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|
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eff_depth = cg2dminColumnEps - |
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& 2. * cg2dminColumnEps / PI * |
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& COS (PI * depth / (2.*cg2dminColumnEps)) |
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|
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pinit = -1. * curPrelVisc * |
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& _recip_dyC(i,j,bi,bj) * _dxG(i,j,bi,bj) |
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& *(phi0surf(i,j,bi,bj)-phi0surf(i,j-1,bi,bj)+ |
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& phiLow-phiLowM1) |
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& /deltaTmom |
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|
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|
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pf(i,j) = pinit * (eff_depth - depth) |
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|
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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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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ENDIF |
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|
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#endif |
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#endif |
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|
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RETURN |
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END |
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