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/* This file is part of Cloudy and is copyright (C)1978-2008 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */
/*ConvFail handle convergence failure */
#include "cddefines.h"
#include "cddrive.h"
#include "prt.h"
#include "phycon.h"
#include "hextra.h"
#include "pressure.h"
#include "dense.h"
#include "thermal.h"
#include "called.h"
#include "hcmap.h"
#include "wind.h"
#include "conv.h"

/*ConvFail handle convergence failure - sets lgAbort if too many failures occur */
void ConvFail(
        /* chMode is one of "pres", "eden", "ioni", "pops", "grai", "temp" */
        const char chMode[], /* chMode[5] */
        /* chDetail - string giving details about the convergence failure */
        const char chDetail[] )
{
        double relerror;

        DEBUG_ENTRY( "ConvFail()" );

        /* >>chng 02 jun 15, add this branch */
        /* do not announce a convergence failure - this was an abort before
         * convergence was achieved */
        if( lgAbort )
        {
                /* an abort is not one of the failures we deal with - simply return and
                 * let something else handle this */
                /*fprintf( ioQQQ, " ConvFail - abort has been set.\n");*/
                return;
        }

        /* pressure failure */
        if( strcmp( chMode , "pres" )==0 )
        {
                /* record number of pressure failures */
                ++conv.nPreFail;
                if( called.lgTalk )
                {
                        fprintf( ioQQQ, 
                                " PROBLEM  ConvFail %li, pressure not converged; itr %li, zone %.2f Te:%.3e Hden:%.4e curr Pres:%.4e Corr Pres:%.4e Pra/gas:%.3e\n", 
                          conv.nPreFail,
                          iteration,
                          fnzone, 
                          phycon.te, 
                          dense.gas_phase[ipHYDROGEN], 
                          pressure.PresTotlCurr, 
                          pressure.PresTotlCorrect,
                          pressure.pbeta);

                        /* this identifies new dynamics that failed near the sonic point */
                        if( fabs(pressure.PresGasCurr - pressure.PresRamCurr)/pressure.PresGasCurr < 0.1 &&
                                ((strcmp(dense.chDenseLaw,"WIND") == 0) && wind.windv < 0. ) )
                        {
                                fprintf( ioQQQ, 
                                        "\n PROBLEM continued, pressure not converged; we are stuck at the sonic point.\n\n");
                                pressure.lgSonicPoint = true;
                        }
                }
        }

        /* electron density failure */
        else if( strcmp( chMode, "eden" ) == 0 )
        {
                /* record number of electron density failures */
                ++conv.nNeFail;

                if( called.lgTalk )
                {
                        fprintf( ioQQQ, 
                                " PROBLEM  ConvFail %li, eden not converged itr %li zone %li fnzone %.2f correct=%.3e "
                                "assumed=%.3e.", 
                          conv.nNeFail,
                          iteration ,
                          nzone ,
                          fnzone,
                          dense.EdenTrue, 
                          dense.eden
                          );

                        /* some extra information that may be printed */
                        /* heating cooling failure */
                        if( !conv.lgConvTemp )
                        {
                                fprintf( ioQQQ, "  Temperature failure also." );
                        }

                        /* heating cooling failure */
                        if( !conv.lgConvIoniz )
                        {
                                fprintf( ioQQQ, "  Ionization failure also." );
                        }

                        /* electron density is oscillating */
                        if( conv.lgEdenOscl )
                        {
                                fprintf( ioQQQ, "  Electron density oscillating." );
                        }

                        /* heating cooling oscillating */
                        if( conv.lgCmHOsc )
                        {
                                fprintf( ioQQQ, "  Heating-cooling oscillating." );
                        }
                }
                fprintf( ioQQQ, " \n");
        }

        else if( strcmp( chMode, "ioni" ) == 0 )
        {
                /* ionization failure */
                ++conv.nIonFail;
                if( called.lgTalk )
                {
                        fprintf( ioQQQ, " PROBLEM  ConvFail %li, %s ionization not converged iteration %li zone %li fnzone %.2f \n", 
                          conv.nIonFail, 
                          chDetail ,
                          iteration ,
                          nzone,
                          fnzone  );
                }
        }

        else if( strcmp( chMode, "pops" ) == 0 )
        {
                /* populations failure */
                ++conv.nPopFail;
                conv.lgConvPops = false;
                if( called.lgTalk )
                {
                        fprintf( ioQQQ, " PROBLEM  ConvFail %li, %s population not converged iteration %li zone %li fnzone %.2f \n", 
                          conv.nPopFail, 
                          chDetail ,
                          iteration,
                          nzone , 
                          fnzone  );
                }
        }

        else if( strcmp( chMode, "grai" ) == 0 )
        {
                /* ionization failure */
                ++conv.nGrainFail;
                if( called.lgTalk )
                {
                        fprintf( ioQQQ, " PROBLEM  ConvFail %ld, a grain failure occurred iteration %li zone %li fnzone  %.2f \n", 
                          conv.nGrainFail, 
                          iteration , 
                          nzone ,
                          fnzone );
                }
        }

        /* rest of routine is temperature failure */
        else if( strcmp( chMode, "temp" ) == 0 )
        {
                ASSERT( fabs((thermal.htot - thermal.ctot)/thermal.htot ) > conv.HeatCoolRelErrorAllowed );
                ++conv.nTeFail;
                if( called.lgTalk )
                {
                        fprintf( ioQQQ, 
                                " PROBLEM  ConvFail %ld, Temp not converged itr %li zone %li fnzone %.2f Te=%.4e DTe=%.2e"
                                " Htot=%.3e Ctot=%.3e rel err=%.3e rel tol:%.3e\n", 
                          conv.nTeFail, 
                          iteration ,
                          nzone ,
                          fnzone, 
                          phycon.te, 
                          thermal.dTemper ,
                          thermal.htot, 
                          thermal.ctot, 
                          (thermal.htot - thermal.ctot)/ thermal.htot,
                          conv.HeatCoolRelErrorAllowed );

                        if( conv.lgTOscl && conv.lgCmHOsc )
                        {
                                fprintf( ioQQQ, " Temperature and d(Cool-Heat)/dT were both oscillating.\n" );
                        }

                        else if( conv.lgTOscl )
                        {
                                fprintf( ioQQQ, " Temperature was oscillating.\n" );
                        }

                        else if( conv.lgCmHOsc )
                        {
                                fprintf( ioQQQ, " d(Cool-Heat)/dT was oscillating.\n" );
                        }

                        /* not really a temperature failure, but something else */
                        if( !conv.lgConvIoniz )
                        {
                                fprintf( ioQQQ, " Solution not converged due to %10.10s\n", 
                                  conv.chConvIoniz );
                        }
                }
        }
        else
        {
                fprintf( ioQQQ, " ConvFail called with insane mode %s detail %s\n", 
                  chMode , 
                  chDetail );
                ShowMe();
                cdEXIT(EXIT_FAILURE);
        }

        /* increment total number of failures */
        ++conv.nTotalFailures;

        /* now see how many total failures we have, and if it is time to abort */
        /* remember which zone this is */
        conv.ifailz[MIN2(conv.nTotalFailures,10)-1] = nzone;

        /* remember the relative error
         * convert to single precision for following max, abs (vax failed here) */
        relerror = fabs((thermal.htot-thermal.ctot)/ thermal.htot);

        conv.failmx = MAX2(conv.failmx,(realnum)relerror);

        /* this branch is non-abort exit - we have not exceeded the limit to the number of failures */
        if( conv.nTotalFailures < conv.LimFail )
        { 
                return;
        }

        fprintf( ioQQQ, " Stop due to excessive convergence failures - there have been %ld so far. \n", 
                conv.LimFail );
        fprintf( ioQQQ, " This limit can be reset with the FAILURES command.\n" );

        /* check whether went into cold neutral gas without cosmic rays */
        if( phycon.te < 1e3 && dense.eden/dense.gas_phase[ipHYDROGEN] < 0.1 &&
                (hextra.cryden == 0.) )
        {
                fprintf( ioQQQ,"\n This problem may be solved by adding cosmic rays.\n");
                fprintf( ioQQQ,"\n The gas was cold and neutral.\n");
                fprintf( ioQQQ,"\n The chemistry is not designed to work without a source of ionization.\n");
                fprintf( ioQQQ, " >>> Add galactic background cosmic rays with the COSMIC RAYS BACKBOUND command and try again.\n\n" );
        }

        /* if due to pressure failures then recommend looking at pressure map */
        if( conv.nPreFail==conv.nTotalFailures )
        {
                fprintf( ioQQQ, " These were all pressure failures - we may be near an unstable point in the cooling curve. \n");
                fprintf( ioQQQ, " The PUNCH PRESSURE HISTORY command will show the n-T-P curve, and may be interesting.\n\n");
        }

        ShowMe();

        /* punt */
        if( conv.lgMap )
        {
                /* only do map if requested */
                /* adjust range of punting map */
                hcmap.RangeMap[0] = (realnum)(phycon.te/100.);
                hcmap.RangeMap[1] = (realnum)MIN2(phycon.te*100.,9e9);
                /* need to make printout out now, before disturbing solution with map */
                PrtZone();
                hcmap.lgMapBeingDone = true;
                map_do(ioQQQ,"punt");
        }

        /* return out from here and let iter_end_check catch lgAbort set,
         * and generate normal output there */
        lgAbort = true;
        if( called.lgTalk )
        {
                fprintf( ioQQQ, " ConvFail sets lgAbort since nTotalFailures=%ld is >= LimFail=%ld\n", 
                  conv.nTotalFailures, 
                  conv.LimFail );
                fprintf( ioQQQ, " This limit can be reset with the FAILURES command.\n");
                fflush( ioQQQ );
        }
        return;
}

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