eden_change.cpp

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/* This file is part of Cloudy and is copyright (C)1978-2013 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */
/*EdenChange - update electron density and its dependent quantities */
#include "cddefines.h"
#include "dense.h"
#include "rfield.h"
#include "thermal.h"
#include "phycon.h"
#include "conv.h"
#include "rt.h"

void EdenChange( double EdenNew )
{
        static double EdenOld=-1;

        DEBUG_ENTRY( "EdenChange()" );

        // init EdenOld on first sweep through this sim
        if( conv.nTotalIoniz==0 )
                EdenOld = dense.eden;

        // this confirms that eden is only changed in this routine
        ASSERT( fp_equal(dense.eden , EdenOld ) );

        dense.eden = EdenNew;
        EdenOld = EdenNew;

        dense.EdenHCorr = dense.eden +
                /* dense.HCorrFac is unity by default and changed with the set HCOR command */
                dense.xIonDense[ipHYDROGEN][0]*1.7e-4 * dense.HCorrFac;
        dense.EdenHCorr_f = (realnum)dense.EdenHCorr;
        dense.edensqte = dense.EdenHCorr/phycon.sqrte;
        dense.cdsqte = dense.edensqte*COLL_CONST;
        dense.SqrtEden = sqrt(dense.eden);

        /* evaluate the plasma frequency one time per zone to avoid PF moving across
         * a line during convergence loops */
        if( nzone != rfield.nZonePlsFrqEval || conv.lgSearch )
        {
                rfield.nZonePlsFrqEval = nzone;
                rfield.plsfrq = (realnum)((ELEM_CHARGE_ESU/sqrt(PI*ELECTRON_MASS)/FR1RYD)*sqrt(dense.eden));

                if( rfield.ipPlasma > 0 )
                {
                        /* increase index for plasma frequency until within proper cell */
                        while( rfield.plsfrq > rfield.anu[rfield.ipPlasma]+rfield.widflx[rfield.ipPlasma]/2. )
                                ++rfield.ipPlasma;

                        /* decrease index for plasma frequency until within proper cell */
                        while( rfield.ipPlasma>2 && rfield.plsfrq < rfield.anu[rfield.ipPlasma]-rfield.widflx[rfield.ipPlasma]/2. )
                                --rfield.ipPlasma;
                }

                /* also remember the largest plasma frequency we encounter */
                rfield.plsfrqmax = MAX2(rfield.plsfrqmax, rfield.plsfrq);

                /* is plasma frequency within energy grid? */
                if( rfield.plsfrq > rfield.anu[0] )
                {
                        rfield.lgPlasNu = true;
                }
        }

        // if plasma frequency has changed we need to update transitions - those
        // below plasma frequency do not exist - emission rate set to smallfloat
        // only do this in search phase since plasma frequency moving across transition
        // would create discontinuous changes in cooling that would present noise
        // to the solver.  The electron density should not change by much during the
        // solution for a zone
        static double EdenEval=-1;
        if( conv.lgSearch && !fp_equal(EdenEval,dense.eden) )
        {
                EdenEval = dense.eden;
                RT_line_all();
        }

        return;
}