timesc.cpp

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/* This file is part of Cloudy and is copyright (C)1978-2022 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */
#include "cddefines.h"
#include "timesc.h"
#include "physconst.h"
#include "struc.h"
t_timesc timesc;

void t_timesc::zero()
{
        /* age of the cloud, to check for time-steady */
        CloudAgeSet = -1.f;
        /* some timescale for CO and H2 */
        time_H2_Dest_longest = 0.;
        time_H2_Form_longest = 0.;
        /* remains neg if not evaluated */
        time_H2_Dest_here = -1.;
        time_H2_Form_here = 0.;

        BigCOMoleForm = 0.;

        TimeH21cm = 0.;
        sound_speed_isothermal = 0.;    
}

void t_timesc::calc_therm_timesc( long int izone )
{
        if( izone <= 0 )
        {
                izone = MAX2(1,nzone-1);
                ASSERT( izone < struc.nzlim );

                /* NZLIM is the size of the struc vectors - should be dynamic 
                 * izone = MIN2( izone, NZLIM-1 );*/
        }

        time_therm_long = 0;
        time_therm_short = BIGDOUBLE;

        for( long i = 0; i < izone; i++ )
        {
                /* >>chng 99 feb 01, had div by heating, changed to cooling so constant
                 * temperature models are more realistic */
                double dt = 1.5 * BOLTZMANN * struc.DenParticles[i] * struc.testr[i] / struc.coolstr[i];
                time_therm_long = MAX2( time_therm_long , dt );
                time_therm_short= MIN2( time_therm_short, dt );
                //      printf("dt = %g\t long = %g\t short = %g\n", dt, time_therm_long, time_therm_short);
        }
        //      printf( "*** long = %g\t short = %g\n", time_therm_long, time_therm_short );

        return;
}