pressure_total.cpp

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/* This file is part of Cloudy and is copyright (C)1978-2017 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */
/*PresTotCurrent determine the gas and line radiation pressures for current conditions,
 * this sets values of pressure.PresTotlCurr, also calls tfidle */
#include "cddefines.h"
#include "taulines.h"
#include "opacity.h"
#include "hydrogenic.h"
#include "conv.h"
#include "iso.h"
#include "wind.h"
#include "magnetic.h"
#include "phycon.h"
#include "thermal.h"
#include "h2.h"
#include "dense.h"
#include "dynamics.h"
#include "trace.h"
#include "rt.h"
#include "pressure.h"
#include "radius.h"
#include "rfield.h"
#include "doppvel.h"
#include "rt_escprob.h"

/* this sets values of pressure.PresTotlCurr, also calls tfidle */
void PresTotCurrent(void)
{
        static long int
          /* used in debug print statement to see which line adds most pressure */
          ipLineTypePradMax=-1 , 
          /* points to line causing radiation pressure */
          ipLinePradMax=-LONG_MAX,
          ip2=-LONG_MAX,
          ip3=-LONG_MAX,
          ip4=-LONG_MAX;

        /* the line radiation pressure variables that must be preserved since
         * a particular line radiation pressure may not be evaluated if it is
         * not important */
        static double Piso_seq[NISO]={0.,0.},
                PLevel2=0.,
                PHfs=0.,
                PCO=0.,
                P_H2=0.,
                P_dBase=0.;

        double 
                RadPres1, 
                TotalPressure_v, 
                pmx;

        DEBUG_ENTRY( "PresTotCurrent()" );

        if( !conv.nTotalIoniz )
        {
                /* resetting ipLinePradMax, necessary for 
                 * multiple cloudy calls in single coreload. */ 
                ipLinePradMax=-LONG_MAX;
                //pressure.PresTotlCurr = 0.;
        }

        /* PresTotCurrent - evaluate total pressure, dyne cm^-2
         * and radiative acceleration */

        /* several loops over the emission lines for radiation pressure and
         * radiative acceleration are expensive due to the number of lines and
         * the memory they occupy.  Many equations of state do not include
         * radiation pressure or radiative acceleration.  Only update these
         * when included in EOS - when not included only evaluate once per zone.
         * do it once per zone since we will still report these quantities.
         * this flag says whether we must update all terms */
        bool lgMustEvaluate = false;

        /* this says we already have an evaluation in this zone so do not 
         * evaluate terms known to be trivial, even when reevaluating major terms */
        bool lgMustEvaluateTrivial = false;
        /* if an individual agent is larger than this fraction of the total current
         * radiation pressure then it is not trivial 
         * conv.PressureErrorAllowed is relative error allowed in pressure */
        double TrivialLineRadiationPressure = conv.PressureErrorAllowed/10. * 
                pressure.pres_radiation_lines_curr;

        /* reevaluate during search phase when conditions are changing dramatically */
        if( conv.lgSearch )
        {
                lgMustEvaluate = true;
                lgMustEvaluateTrivial = true;
        }

        /* reevaluate if zone or iteration has changed */
        static long int nzoneEvaluated=0, iterationEvaluated=0;
        if( nzone!=nzoneEvaluated || iteration!=iterationEvaluated )
        {
                lgMustEvaluate = true;
                lgMustEvaluateTrivial = true;
                /* this flag says which source of radiation pressure was strongest */
                ipLineTypePradMax = -1;
        }

        /* constant pressure or dynamical sim - we must reevaluate terms 
         * but do not need to reevaluate trivial contributors */
        if( (strcmp(dense.chDenseLaw,"WIND") == 0 ) ||
                 (strcmp(dense.chDenseLaw,"DYNA") == 0 ) ||
                (strcmp(dense.chDenseLaw,"CPRE") == 0 ) )
                lgMustEvaluate = true;

        if( lgMustEvaluate )
        {
                /* we are reevaluating quantities in this zone and iteration,
                 * remember that we did it */
                nzoneEvaluated = nzone;
                iterationEvaluated = iteration;
        }

        /* update density - temperature variables which may have changed */
        /* must call TempChange since ionization has changed, there are some
        * terms that affect collision rates (H0 term in electron collision) */
        TempChange(phycon.te , false);

        ASSERT(lgElemsConserved());

        /* evaluate the total ionization energy on a scale where neutral atoms
         * correspond to an energy of zero, so the ions have a positive energy */
        phycon.EnergyIonization = 0.;
#if 0
        for( long nelem=ipHYDROGEN; nelem < LIMELM; nelem++ )
        {
                for( long ion=dense.IonLow[nelem]; ion<=dense.IonHigh[nelem]; ++ion )
                {
                        /* lgMETALS is true, set false with "no advection metals" command */
                        int kadvec = dynamics.lgMETALS;
                        /* this gives the iso sequence for this ion - should it be included in the
                         * advected energy equation? lgISO is true, set false with 
                         * "no advection H-like" and "he-like" - for testing*/
                        ipISO = nelem-ion;
                        fixit(); /* should this be kadvec = kadvec && dynamics.lgISO[ipISO]; ? */
                        if( ipISO >= 0 && ipISO<NISO )
                                kadvec = dynamics.lgISO[ipISO];
                        for( long i=1; i<=ion; ++i )
                        {
                                long int nelec = nelem+1 - i;
                                /* this is the sum of all the energy needed to bring the atom up
                                 * to the ion+1 level of ionization - at this point a positive number */
                                phycon.EnergyIonization += dense.xIonDense[nelem][ion] * 
                                        t_ADfA::Inst().ph1(Heavy.nsShells[nelem][i-1]-1,nelec,nelem,0)/EVRYD* 0.9998787*kadvec;
                        }
                }
        }
        /* convert to ergs/cm^3 */
        phycon.EnergyIonization *= EN1RYD;
#endif

        phycon.EnergyBinding = 0.;

        /* find total number of atoms and ions */
        SumDensities();

        /* the current gas pressure */
        pressure.PresGasCurr = dense.pden*phycon.te*BOLTZMANN;
        /*fprintf(ioQQQ,"DEBUG gassss %.2f %.4e %.4e %.4e \n", 
                fnzone, pressure.PresGasCurr , dense.pden , pressure.PresInteg );*/

        /* >>chng 01 nov 02, move to here from dynamics routines */
        /* >>chng 02 jun 18 (rjrw), fix to use local values */
        /* WJH 21 may 04, now recalculate wind v for the first zone too.
         * This is necessary when we are forcing the sub or supersonic branch */
        if(!(wind.lgBallistic() || wind.lgStatic()))
        {
                wind.windv = DynaFlux(radius.depth)/(dense.xMassDensity);
        }

        /* this is the current ram pressure, at this location */
        pressure.PresRamCurr = dense.xMassDensity*POW2( wind.windv );

        /* this is the current turbulent pressure, not now added to equation of state 
         * >>chng 06 mar 29, add Heiles_Troland_F / 6. term*/
        pressure.PresTurbCurr = dense.xMassDensity*POW2( DoppVel.TurbVel ) *
                DoppVel.Heiles_Troland_F / 6.;

        /* radiative acceleration, lines and continuum */
        if( lgMustEvaluate )
        {
                /* continuous radiative acceleration */
                double rforce = 0.;
                double relec = 0.;
                for( long i=0; i < rfield.nflux; i++ )
                {
                        rforce += (rfield.flux[0][i] + rfield.outlin[0][i] + rfield.outlin_noplot[i]+ rfield.ConInterOut[i])*
                                rfield.anu(i)*(opac.opacity_abs[i] + opac.opacity_sct[i]);

                        /* electron scattering acceleration - used only to derive force multiplier */
                        relec += 
                                (rfield.flux[0][i] + rfield.outlin[0][i] + rfield.outlin_noplot[i]+ 
                                rfield.ConInterOut[i]) * 
                                opac.OpacStack[i-1+opac.iopcom]*dense.eden*rfield.anu(i);
                }
                /* total continuum radiative acceleration */
                wind.AccelCont = (realnum)(rforce*EN1RYD/SPEEDLIGHT/dense.xMassDensity);

                wind.AccelElectron = (realnum)(relec*EN1RYD/SPEEDLIGHT/dense.xMassDensity);

                /* line acceleration; xMassDensity is gm per cc */
                wind.AccelLine = (realnum)(RT_line_driving()/SPEEDLIGHT/dense.xMassDensity);

                /* total acceleration cm s^-2 */
                wind.AccelTotalOutward = wind.AccelCont + wind.AccelLine;

                /* find wind.fmul - the force multiplier; wind.AccelElectron can be zero for very low 
                 * densities - fmul is of order unity - wind.AccelLine and wind.AccelCont 
                 * are both floats to will underflow long before wind.AccelElectron will - fmul is only used
                 * in output, not in any physics */
                if( wind.AccelElectron > SMALLFLOAT )
                        wind.fmul = (realnum)( (wind.AccelLine + wind.AccelCont) / wind.AccelElectron);
                else
                        wind.fmul = 0.;

                /* inward acceleration of gravity cm s^-2 */
                if (wind.comass == 0.)
                {
                        wind.AccelGravity = 0.;
                }
                else
                {
                        double reff = radius.Radius-radius.drad/2.;
                        wind.AccelGravity = (realnum)(
                                /* wind.comass - mass of star in solar masses */
                                GRAV_CONST*wind.comass*SOLAR_MASS/POW2(reff)*
                                /* wind.DiskRadius normally zero, set with disk option on wind command */
                                (1.-wind.DiskRadius/reff) );
                }

#               if 0
                if( fudge(-1) )
                        fprintf(ioQQQ,"DEBUG pressure_total updates AccelTotalOutward to %.2e grav %.2e\n",
                        wind.AccelTotalOutward , wind.AccelGravity );
#               endif
        }

        /* must always evaluate H La width since used elsewhere */
        if( iso_sp[ipH_LIKE][ipHYDROGEN].trans(ipH2p,ipH1s).Emis().PopOpc() > 0. )
        {
                hydro.HLineWidth = (realnum)RT_LineWidth(iso_sp[ipH_LIKE][ipHYDROGEN].trans(ipH2p,ipH1s),GetDopplerWidth(dense.AtomicWeight[ipHYDROGEN]));
        }
        else
                hydro.HLineWidth = 0.;


        /* find max rad pressure even if capped
         * lgLineRadPresOn is turned off by NO RADIATION PRESSURE command */
        if( trace.lgTrace )
        {
                fprintf(ioQQQ,
                        "     PresTotCurrent nzone %li iteration %li lgMustEvaluate:%c "
                        "lgMustEvaluateTrivial:%c " 
                        "pressure.lgLineRadPresOn:%c " 
                        "rfield.lgDoLineTrans:%c \n", 
                        nzone , iteration , TorF(lgMustEvaluate) , TorF(lgMustEvaluateTrivial),
                        TorF(pressure.lgLineRadPresOn), TorF(rfield.lgDoLineTrans) );
        }

        if( lgMustEvaluate && pressure.lgLineRadPresOn && rfield.lgDoLineTrans )
        {
                /* RadPres is pressure due to lines, lgPres_radiation_ON turns off or on */
                pressure.pres_radiation_lines_curr = 0.;
                /* used to remember largest radiation pressure source */
                pmx = 0.;
                for( long ipISO=ipH_LIKE; ipISO<NISO; ++ipISO )
                {
                        if( lgMustEvaluateTrivial || Piso_seq[ipISO] > TrivialLineRadiationPressure )
                        {
                                Piso_seq[ipISO] = 0.;
                                for( long nelem=ipISO; nelem < LIMELM; nelem++ )
                                {
                                        /* does this ion stage exist? */
                                        if( dense.IonHigh[nelem] >= nelem + 1 - ipISO  )
                                        {
                                                /* do not include highest levels since maser can occur due to topoff,
                                                 * and pops are set to small number in this case */
                                                for( long ipHi=1; ipHi <iso_sp[ipISO][nelem].numLevels_local - iso_sp[ipISO][nelem].nCollapsed_local; ipHi++ )
                                                {
                                                        for( long ipLo=0; ipLo < ipHi; ipLo++ )
                                                        {
                                                                if( iso_sp[ipISO][nelem].trans(ipHi,ipLo).ipCont() <= 0 )
                                                                        continue;

                                                                ASSERT( iso_sp[ipISO][nelem].trans(ipHi,ipLo).Emis().Aul() > iso_ctrl.SmallA );

                                                                if( iso_sp[ipISO][nelem].trans(ipHi,ipLo).Emis().PopOpc() > SMALLFLOAT &&
                                                                        /* test that have not overrun optical depth scale */
                                                                        ( (iso_sp[ipISO][nelem].trans(ipHi,ipLo).Emis().TauTot() - 
                                                                                iso_sp[ipISO][nelem].trans(ipHi,ipLo).Emis().TauIn()) > SMALLFLOAT ) &&
                                                                        iso_sp[ipISO][nelem].trans(ipHi,ipLo).Emis().Pesc() > FLT_EPSILON*100. )
                                                                {
                                                                        RadPres1 =  PressureRadiationLine( iso_sp[ipISO][nelem].trans(ipHi,ipLo), GetDopplerWidth(dense.AtomicWeight[nelem]) );
                                                                        
                                                                        if( RadPres1 > pmx )
                                                                        {
                                                                                ipLineTypePradMax = 2;
                                                                                pmx = RadPres1;
                                                                                ip4 = ipISO;
                                                                                ip3 = nelem;
                                                                                ip2 = ipHi;
                                                                                ipLinePradMax = ipLo;
                                                                        }
                                                                        Piso_seq[ipISO] += RadPres1;
                                                                        {
                                                                                /* option to print particulars of some line when called */
                                                                                enum {DEBUG_LOC=false};
                                                                                if( DEBUG_LOC && ipISO==ipH_LIKE && ipLo==3 && ipHi==5 && nzone > 260 )
                                                                                {
                                                                                        fprintf(ioQQQ,
                                                                                                "DEBUG prad1 \t%.2f\t%.2e\t%.2e\t%.2e\t%.2e\t%.2e\t\n",
                                                                                                fnzone,
                                                                                                RadPres1,
                                                                                                iso_sp[ipISO][nelem].trans(ipHi,ipLo).Emis().PopOpc(),
                                                                                                iso_sp[ipISO][nelem].st[ipLo].Pop(),
                                                                                                iso_sp[ipISO][nelem].st[ipHi].Pop(),
                                                                                                iso_sp[ipISO][nelem].trans(ipHi,ipLo).Emis().Pesc());
                                                                                }
                                                                        }
                                                                }
                                                        }
                                                }
                                        }
                                }
                                ASSERT( Piso_seq[ipISO] >= 0. );
                        }
                        pressure.pres_radiation_lines_curr += Piso_seq[ipISO];
                }
                {
                        /* option to print particulars of some line when called */
                        enum {DEBUG_LOC=false};
#                       if 0
                        if( DEBUG_LOC /*&& iteration > 1*/ && nzone > 260 )
                        {
                                fprintf(ioQQQ,
                                        "DEBUG prad2 \t%li\t%.2e\t%.2e\t%.2e\t%.2e\t%.2e\t%.2e\t%.2e\t%.2e\n",
                                        nzone,
                                        pmx,
                                        iso_sp[ipISO][ip3].trans(ipLinePradMax,ip2).Emis().PopOpc(),
                                        iso_sp[ipISO][ip3].st[0].Pop(),
                                        iso_sp[ipISO][ip3].st[2].Pop(),
                                        iso_sp[ipISO][ip3].st[3].Pop(),
                                        iso_sp[ipISO][ip3].st[4].Pop(),
                                        iso_sp[ipISO][ip3].st[5].Pop(),
                                        iso_sp[ipISO][ip3].st[6].Pop());
                        }
#                       endif
                        if( DEBUG_LOC /*&& iteration > 1 && nzone > 150 */)
                        {
                                fprintf(ioQQQ,
                                        "DEBUG prad3\t%.2e\t%li\t%li\t%li\t%li\t%.2e\t%.2e\t%.2e\n",
                                        pmx,
                                        ip4,
                                        ip3,
                                        ip2,
                                        ipLinePradMax,
                                        iso_sp[ip4][ip3].trans(ip2,ipLinePradMax).Emis().PopOpc(),
                                        iso_sp[ip4][ip3].st[ip2].Pop(),
                                        1.-iso_sp[ip4][ip3].trans(ip2,ipLinePradMax).Emis().Pesc() );
                        }
                }

                if( lgMustEvaluateTrivial || PLevel2 > TrivialLineRadiationPressure )
                {
                        /* level 2 lines */
                        PLevel2 = 0.;
                        for( long i=0; i < nWindLine; i++ )
                        {
                                if( (*TauLine2[i].Hi()).IonStg() < (*TauLine2[i].Hi()).nelem()+1-NISO )
                                {
                                        if( (*TauLine2[i].Hi()).Pop() > 1e-30 )
                                        {
                                                RadPres1 = PressureRadiationLine( TauLine2[i], GetDopplerWidth(dense.AtomicWeight[(*TauLine2[i].Hi()).nelem()-1]) );

                                                PLevel2 += RadPres1;
                                                if( RadPres1 > pmx )
                                                {
                                                        ipLineTypePradMax = 4;
                                                        pmx = RadPres1;
                                                        ipLinePradMax = i;
                                                }
                                        }
                                }
                        }
                        ASSERT( PLevel2 >= 0. );
                }
                pressure.pres_radiation_lines_curr += PLevel2;

                /* fine structure lines */
                if( lgMustEvaluateTrivial || PHfs > TrivialLineRadiationPressure )
                {
                        PHfs = 0.;
                        for( size_t i=0; i < HFLines.size(); i++ )
                        {
                                if( (*HFLines[i].Hi()).Pop() > 1e-30 )
                                {
                                        RadPres1 = PressureRadiationLine( HFLines[i], GetDopplerWidth(dense.AtomicWeight[(*HFLines[i].Hi()).nelem()-1]) );

                                        PHfs += RadPres1;
                                        if( RadPres1 > pmx )
                                        {
                                                ipLineTypePradMax = 8;
                                                pmx = RadPres1;
                                                ipLinePradMax = i;
                                        }
                                }
                        }
                        ASSERT( PHfs >= 0. );
                }
                pressure.pres_radiation_lines_curr += PHfs;

                /* radiation pressure due to H2 lines */
                if( lgMustEvaluateTrivial || P_H2 > TrivialLineRadiationPressure )
                {
                        P_H2 = 0.;
                        for( diatom_iter diatom = diatoms.begin(); diatom != diatoms.end(); ++diatom )
                        {
                                P_H2 += (*diatom)->H2_RadPress();
                                /* flag to remember H2 radiation pressure */
                                if( P_H2 > pmx )
                                {
                                        pmx = P_H2;
                                        ipLineTypePradMax = 9;
                                }
                                ASSERT( P_H2 >= 0. );
                        }
                }
                pressure.pres_radiation_lines_curr += P_H2;

                /* do lines from third-party databases */
                if( lgMustEvaluateTrivial || P_dBase > TrivialLineRadiationPressure )
                {
                        P_dBase = 0.;
                        for( long ipSpecies=0; ipSpecies<nSpecies; ipSpecies++ )
                        {
                                if( dBaseSpecies[ipSpecies].lgActive )
                                {
                                        realnum DopplerWidth = GetDopplerWidth( dBaseSpecies[ipSpecies].fmolweight );
                                        for (TransitionList::iterator tr=dBaseTrans[ipSpecies].begin(); 
                                                  tr != dBaseTrans[ipSpecies].end(); ++tr)
                                        {       
                                                int ipHi = (*tr).ipHi();
                                                if (ipHi >= dBaseSpecies[ipSpecies].numLevels_local)
                                                        continue;
                                                int ipLo = (*tr).ipLo();
                                                if( (*tr).ipCont() > 0 && (*(*tr).Hi()).Pop() > 1e-30 )
                                                {
                                                        RadPres1 =  PressureRadiationLine( *tr, DopplerWidth );
                                                        
                                                        if( RadPres1 > pmx )
                                                        {
                                                                ipLineTypePradMax = 10;
                                                                pmx = RadPres1;
                                                                ip3 = ipSpecies;
                                                                ip2 = ipHi;
                                                                ipLinePradMax = ipLo;
                                                        }
                                                        P_dBase += RadPres1;
                                                }
                                        }
                                }
                        }
                        ASSERT( P_dBase >= 0. );
                }
                pressure.pres_radiation_lines_curr += P_dBase;

        }
        else if( !pressure.lgLineRadPresOn || !rfield.lgDoLineTrans )
        {
                /* case where radiation pressure is not turned on */
                ipLinePradMax = -1;
                ipLineTypePradMax = 0;
        }

        fixit("all other line stacks need to be included here");
        // can we just sweep over line stack?  Is that ready yet?

        /* the ratio of radiation to total (gas + continuum + etc) pressure */
        pressure.pbeta = (realnum)(pressure.pres_radiation_lines_curr/SDIV(pressure.PresTotlCurr));

        /* this would be a major logical error */
        if( pressure.pres_radiation_lines_curr < 0. )
        {
                fprintf(ioQQQ,
                        "PresTotCurrent: negative pressure, constituents follow %e %e %e %e \n",
                Piso_seq[ipH_LIKE],
                Piso_seq[ipHE_LIKE],
                PLevel2,
                PCO);
                ShowMe();
                cdEXIT(EXIT_FAILURE);
        }

        /* following test will never succeed, here to trick lint, ipLineTypePradMax is only used
         * when needed for debug */
        if( trace.lgTrace && ipLineTypePradMax <0 )
        {
                fprintf(ioQQQ,
                        "     PresTotCurrent, pressure.pbeta = %e, ipLineTypePradMax%li ipLinePradMax=%li \n", 
                        pressure.pbeta,ipLineTypePradMax,ipLinePradMax );
        }

        /* this is the total internal energy of the gas, the amount of energy needed
         * to produce the current level populations, relative to ground,
         * only used for energy terms in advection */
        phycon.EnergyExcitation = 0.;
#if 0
        fixit(); /* the quantities phycon.EnergyExcitation, phycon.EnergyIonization, phycon.EnergyBinding
                  * are not used anywhere, except in print statements... */
        broken(); /* the code below contains serious bugs! It is supposed to implement loops
                   * over quantum states in order to evaluate the potential energy stored in
                   * excited states of all atoms, ions, and molecules. The code below however
                   * often implements loops over all combinations of upper and lower levels!
                   * This code needs to be rewritten once quantumstates are fully implemented. */
        ipLo = 0;
        for( long ipISO=ipH_LIKE; ipISO<NISO; ++ipISO )
        {
                for( long nelem=ipISO; nelem < LIMELM; nelem++ )
                {
                        if( dense.IonHigh[nelem] == nelem + 1 - ipISO )
                        {
                                /* >>chng 06 aug 17, should go to numLevels_local instead of _max. */
                                for( long ipHi=1; ipHi < iso_sp[ipISO][nelem].numLevels_local; ipHi++ )
                                {
                                        phycon.EnergyExcitation += 
                                                iso_sp[ipISO][nelem].st[ipHi].Pop() * 
                                                iso_sp[ipISO][nelem].trans(ipHi,ipLo).EnergyErg() *
                                                /* last term is option to turn off energy term, no advection hlike, he-like */
                                                dynamics.lgISO[ipISO];
                                }
                        }
                }
        }

        if( dynamics.lgISO[ipH_LIKE] )
                /* internal energy of H2 */
                phycon.EnergyExcitation += H2_InterEnergy();

        /* this is option to turn off energy effects of advection, no advection metals */
        if( dynamics.lgMETALS )
        {
                for( long i=0; i < nWindLine; i++ )
                {
                        if( (*TauLine2[i].Hi()).IonStg() < (*TauLine2[i].Hi()).nelem()+1-NISO )
                        {
                                phycon.EnergyExcitation += 
                                        (*TauLine2[i].Hi()).Pop()* TauLine2[i].EnergyErg;
                        }
                }
                for( long i=0; i < nHFLines; i++ )
                {
                        phycon.EnergyExcitation += 
                                (*HFLines[i].Hi()).Pop()* HFLines[i].EnergyErg;
                }

                /* internal energy of large FeII atom */
        }
#endif

        /* ==================================================================
         * end internal energy of atoms and molecules */

        /* evaluate some parameters to do with magnetic field */
        Magnetic_evaluate();

        /*lint -e644 Piso_seq not init */
        if( trace.lgTrace && (pressure.PresTotlCurr > SMALLFLOAT) )
        {
                fprintf(ioQQQ,
                        "     PresTotCurrent zn %.2f Ptot:%.5e Pgas:%.3e Prad:%.3e Pmag:%.3e Pram:%.3e "
                        "gas parts; H:%.2e He:%.2e L2:%.2e CO:%.2e fs%.2e h2%.2e turb%.2e\n",
                        fnzone,
                        pressure.PresTotlCurr, 
                        pressure.PresGasCurr/pressure.PresTotlCurr,
                        pressure.pres_radiation_lines_curr*pressure.lgPres_radiation_ON/pressure.PresTotlCurr,
                        magnetic.pressure/pressure.PresTotlCurr,
                        pressure.PresRamCurr*pressure.lgPres_ram_ON/pressure.PresTotlCurr,
                        Piso_seq[ipH_LIKE]/pressure.PresTotlCurr,
                        Piso_seq[ipHE_LIKE]/pressure.PresTotlCurr,
                        PLevel2/pressure.PresTotlCurr,
                        PCO/pressure.PresTotlCurr,
                        PHfs/pressure.PresTotlCurr,
                        P_H2/pressure.PresTotlCurr,
                        pressure.PresTurbCurr*DoppVel.lgTurb_pressure/pressure.PresTotlCurr);
                /*lint +e644 Piso_seq not initialized */
        }

        /* Conserved quantity in steady-state energy equation for dynamics:
         * thermal energy, since recombination is treated as cooling
         * (i.e. is loss of electron k.e. to emitted photon), so don't
         * include
         * ...phycon.EnergyExcitation + phycon.EnergyIonization + phycon.EnergyBinding
         * */

        /* constant density case is also hypersonic case */
        if( dynamics.lgTimeDependentStatic )
        {
                /* this branch is time dependent single-zone */
                /* \todo        1       this has 3/2 on the PresGasCurr while true dynamics case below
                 * has 5/2 - so this is not really the enthalpy density - better
                 * would be to always use this term and add the extra PresGasCurr
                 * when the enthalpy is actually needed */
                phycon.EnthalpyDensity =  
                        0.5*POW2(wind.windv)*dense.xMassDensity +       /* KE */
                        3./2.*pressure.PresGasCurr +                            /* thermal plus PdV work */
                        magnetic.EnthalpyDensity;                                       /* magnetic terms */
                        //pressure.RhoGravity * (radius.Radius/(radius.Radius+radius.drad)); /* gravity */
        }
        else
        {
                /* this branch either advective or constant pressure */
                /*fprintf(ioQQQ,"DEBUG enthalpy HIT2\n");*/
                /* this is usual dynamics case, or time-varying case where pressure
                 * is kept constant and PdV work is added to the cell */
                phycon.EnthalpyDensity =  
                        0.5*POW2(wind.windv)*dense.xMassDensity +       /* KE */
                        5./2.*pressure.PresGasCurr +                            /* thermal plus PdV work */
                        magnetic.EnthalpyDensity;                                       /* magnetic terms */
                        //pressure.RhoGravity * (radius.Radius/(radius.Radius+radius.drad)); /* gravity */
        }

        /* stop model from running away on first iteration, when line optical
         * depths are not defined correctly anyway.
         * if( iter.le.itermx .and. RadPres.ge.GasPres ) then
         * >>chng 97 jul 23, only cap radiation pressure on first iteration */
        if( iteration <= 1 && pressure.pres_radiation_lines_curr >= pressure.PresGasCurr )
        {
                /* stop RadPres from exceeding the gas pressure on first iteration */
                pressure.pres_radiation_lines_curr = 
                        MIN2(pressure.pres_radiation_lines_curr,pressure.PresGasCurr);
                pressure.lgPradCap = true;
        }

        /* remember the globally most important line, in the entire model 
         * test on nzone so we only do test after solution is stable */
        if( pressure.pbeta > pressure.RadBetaMax && nzone )
        {
                pressure.RadBetaMax = pressure.pbeta;
                pressure.ipPradMax_line = ipLinePradMax;
                pressure.ipPradMax_nzone = nzone;
                if( ipLineTypePradMax == 2 )
                {
                        /* hydrogenic */
                        pressure.chLineRadPres = "ISO   ";
                        ASSERT( ip4 < NISO && ip3<LIMELM );
                        ASSERT( ipLinePradMax>=0 && ip2>=0 && ip3>=0 && ip4>=0 );
                        pressure.chLineRadPres += chLineLbl(iso_sp[ip4][ip3].trans(ip2,ipLinePradMax));
                        {
                                /* option to print particulars of some line when called */
                                enum {DEBUG_LOC=false};
                                /*lint -e644 Piso_seq not initialized */
                                /* trace serious constituents in radiation pressure */
                                if( DEBUG_LOC  )
                                {
                                        fprintf(ioQQQ,"DEBUG iso prad\t%li\t%li\tISO,nelem=\t%li\t%li\tnu, no=\t%li\t%li\t%.4e\t%.4e\t%e\t%e\t%e\n",
                                        iteration, nzone, 
                                        ip4,ip3,ip2,ipLinePradMax,
                                        iso_sp[ip4][ip3].trans(ip2,ipLinePradMax).Emis().TauIn(),
                                        iso_sp[ip4][ip3].trans(ip2,ipLinePradMax).Emis().TauTot(),
                                        iso_sp[ip4][ip3].trans(ip2,ipLinePradMax).Emis().Pesc(),
                                        iso_sp[ip4][ip3].trans(ip2,ipLinePradMax).Emis().Pelec_esc(),
                                        iso_sp[ip4][ip3].trans(ip2,ipLinePradMax).Emis().Pdest());
                                        if( ip2==5 && ipLinePradMax==4 )
                                        {
                                                double width;
                                                fprintf(ioQQQ,"hit it\n");
                                                width = RT_LineWidth(iso_sp[ip4][ip3].trans(ip2,ipLinePradMax),GetDopplerWidth(dense.AtomicWeight[ip3]));
                                                fprintf(ioQQQ,"DEBUG width %e\n", width);
                                        }
                                }
                        }
                }
                else if( ipLineTypePradMax == 4 )
                {
                        /* level 2 lines */
                        ASSERT( ipLinePradMax>=0  );
                        pressure.chLineRadPres = "Level2 ";
                        pressure.chLineRadPres += chLineLbl(TauLine2[ipLinePradMax]);
                }
                else if( ipLineTypePradMax == 5 )
                {
                        cdEXIT( EXIT_FAILURE );
                }
                else if( ipLineTypePradMax == 6 )
                {
                        cdEXIT( EXIT_FAILURE );
                }
                else if( ipLineTypePradMax == 7 )
                {
                        /* FeII lines */
                        pressure.chLineRadPres = "Fe II ";
                }
                else if( ipLineTypePradMax == 8 )
                {
                        /* hyperfine struct lines */
                        pressure.chLineRadPres = "hyperf ";
                        ASSERT( ipLinePradMax>=0  );
                        pressure.chLineRadPres += chLineLbl(HFLines[ipLinePradMax]);
                }
                else if( ipLineTypePradMax == 9 )
                {
                        /* large H2 lines */
                        pressure.chLineRadPres = "large H2 ";
                }
                else if( ipLineTypePradMax == 10 )
                {
                        /* database lines */
                        pressure.chLineRadPres = "dBaseLin " ;
                        pressure.chLineRadPres += dBaseSpecies[ip3].chLabel ;
                }
                else
                {
                        fprintf(ioQQQ," PresTotCurrent ipLineTypePradMax set to %li, this is impossible.\n", ipLineTypePradMax);
                        ShowMe();
                        cdEXIT(EXIT_FAILURE);
                }
        }

        if( trace.lgTrace && pressure.pbeta > 0.5 )
        {
                fprintf(ioQQQ,
                        "     PresTotCurrent Pbeta:%.2f due to %s\n",
                        pressure.pbeta ,
                   pressure.chLineRadPres.c_str()
                        );
        }

        /* >>chng 02 jun 27 - add in magnetic pressure */
        /* start to bring total pressure together */
        TotalPressure_v = pressure.PresGasCurr;

        /* these flags are set false by default since constant density is default,
         * set true for constant pressure or dynamics */
        TotalPressure_v += pressure.PresRamCurr * pressure.lgPres_ram_ON;

        /* magnetic pressure, evaluated in magnetic.c - this can be negative for an ordered field! 
         * option is on by default, turned off with constant density, or constant gas pressure, cases */
        TotalPressure_v += magnetic.pressure * pressure.lgPres_magnetic_ON;

        /* turbulent pressure
         * >>chng 06 mar 24, include this by default */
        TotalPressure_v += pressure.PresTurbCurr * DoppVel.lgTurb_pressure;

        /* radiation pressure only included in total eqn of state when this flag is
         * true, set with constant pressure command */
        /* option to add in internal line radiation pressure */
        TotalPressure_v += pressure.pres_radiation_lines_curr * pressure.lgPres_radiation_ON;

        {
                enum{DEBUG_LOC=false};
                if( DEBUG_LOC && pressure.PresTotlCurr > SMALLFLOAT /*&& iteration > 1*/ )
                {
                        fprintf(ioQQQ,"pressureee%li\t%.4e\t%.4e\t%.4e\t%.3f\t%.3f\t%.3f\n", 
                                nzone,
                                pressure.PresTotlError,
                            pressure.PresTotlCurr, 
                                TotalPressure_v ,
                                pressure.PresGasCurr/pressure.PresTotlCurr,
                                pressure.pres_radiation_lines_curr/pressure.PresTotlCurr ,
                                pressure.PresRamCurr/pressure.PresTotlCurr
                                );
                }
        }

        if( TotalPressure_v< 0. )
        {
                ASSERT( magnetic.pressure < 0. );

                /* negative pressure due to ordered field overwhelms total pressure - punt */
                fprintf(ioQQQ," The negative pressure due to ordered magnetic field overwhelms the total outward pressure - please reconsider the geometry & field.\n");
                cdEXIT(EXIT_FAILURE);
        }

        ASSERT( TotalPressure_v > 0. );

        /* remember highest pressure anywhere */
        pressure.PresMax = MAX2(pressure.PresMax,(realnum)TotalPressure_v);

        /* this is what we came for - set the current pressure */
        pressure.PresTotlCurr = TotalPressure_v;

        return;
}