Loi_Etat_Binaire_GP_base.cpp

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#include <Loi_Etat_Binaire_GP_base.h>
#include <Fluide_Dilatable_base.h>
#include <Champ_Fonc_Tabule.h>
#include <Champ_Uniforme.h>
#include <Param.h>
#include <Debog.h>
 
Implemente_base_sans_constructeur(Loi_Etat_Binaire_GP_base,"Loi_Etat_Binaire_Gaz_Parfait_base",Loi_Etat_Melange_GP_base);
 
Loi_Etat_Binaire_GP_base::Loi_Etat_Binaire_GP_base():
  massmol1_(-1),massmol2_(-1),mu1_(-1),mu2_(-1),tempr_(-1),diff_coeff_(-1) { }
 
Sortie& Loi_Etat_Binaire_GP_base::printOn(Sortie& os) const
{
  os <<que_suis_je()<< finl;
  return os;
}
 
Entree& Loi_Etat_Binaire_GP_base::readOn(Entree& is)
{
  Param param(que_suis_je());
  param.ajouter("molar_mass1",&massmol1_,Param::REQUIRED);
  param.ajouter("molar_mass2",&massmol2_,Param::REQUIRED);
  param.ajouter("mu1",&mu1_,Param::REQUIRED);
  param.ajouter("mu2",&mu2_,Param::REQUIRED);
  param.ajouter("temperature",&tempr_,Param::REQUIRED);
  param.ajouter("diffusion_coeff",&diff_coeff_,Param::REQUIRED);
  param.lire_avec_accolades_depuis(is);
  return is;
}
 
void Loi_Etat_Binaire_GP_base::calculer_lambda()
{
  /* Do nothing */
}
 
/*! @brief Computes the mixture dynamic viscosity (depends on mass fractions). See Wilke https://aip.
 *
 * @brief scitation.org/doi/pdf/10.1063/1.1747673
 *
 */
void Loi_Etat_Binaire_GP_base::calculer_mu_wilke()
{
  const DoubleTab& tab_Y1 = le_fluide->inco_chaleur().valeurs();
  DoubleTab& tab_mu = le_fluide->viscosite_dynamique().valeurs();
 
  int i, n=tab_mu.size();
  for (i=0 ; i<n ; i++)
    {
      double m1om2 = massmol1_/massmol2_;
      double m2om1 = 1./m1om2;
      double mu1omu2 = mu1_/mu2_;
      double mu2omu1 = 1./mu1omu2;
 
      // XXX : Which is better ?
      double a1 = 1. + sqrt(mu1omu2) * pow(mu2omu1,0.25);
      double a2 = 1. + sqrt(mu2omu1) * pow(mu1omu2,0.25);
      //double a1 = 1. + sqrt(mu1omu2) * exp(0.25*log(mu2omu1));
      //double a2 = 1. + sqrt(mu2omu1) * exp(0.25*log(mu1omu2));
      double b1 = sqrt(8.*(1.+m1om2));
      double b2 = sqrt(8.*(1.+m2om1));
      double phi_12 = m1om2*a1*a1/b1;
      double phi_21 = m2om1*a2*a2/b2;
 
      double y1 = tab_Y1(i,0);
      double y2 = 1. - y1; // All about binary mixture !
 
      tab_mu(i,0) = (mu1_*y1)/(y1+y2*phi_12) + (mu2_*y2)/(y2+y1*phi_21);
    }
  tab_mu.echange_espace_virtuel();
  Debog::verifier("calculer_mu_wilke",tab_mu);
}
 
/*! @brief Computes the dynamic viscosity.
 *
 */
void Loi_Etat_Binaire_GP_base::calculer_mu()
{
  Champ_Don_base& mu = le_fluide->viscosite_dynamique();
  if (!sub_type(Champ_Uniforme,mu))
    {
      if (sub_type(Champ_Fonc_Tabule,mu))
        {
          Cerr << "We should not have a dynamic viscosity of type Champ_Fonc_Tabule !" << finl;
          Process::exit();
        }
      else
        calculer_mu_wilke();
    }
  else
    {
      Cerr << "We should not have a dynamic viscosity of type Champ_Uniforme !" << finl;
      Process::exit();
    }
}
 
void Loi_Etat_Binaire_GP_base::calculer_alpha()
{
  /* Do nothing */
}
 
/*! @brief Computes the dynamic viscosity divided by the Schmidt number (rho*D).
 *
 */
void Loi_Etat_Binaire_GP_base::calculer_mu_sur_Sc()
{
  /*
   * ====================================================================
   * Schmidt number : Sc = nu / D = mu / ( rho * D )
   * => rho * D = mu/Sc
   * species equation : div ( rho * D * grad Y1) = div ( mu/Sc * grad Y1)
   * ====================================================================
   */
 
  Champ_Don_base& mu_sur_Sc = le_fluide->mu_sur_Schmidt();
  const Champ_base& rho = le_fluide->masse_volumique();
  DoubleTab& tab_mu_sur_Sc = mu_sur_Sc.valeurs();
  const DoubleTab& tab_rho = rho.valeurs();
  const int n=tab_mu_sur_Sc.size();
 
  if (!sub_type(Champ_Uniforme,mu_sur_Sc))
    {
      if (sub_type(Champ_Uniforme,rho))
        {
          Cerr << "We should not have a density field of type Champ_Uniforme !" << finl;
          Process::exit();
        }
      else
        for (int i=0 ; i<n ; i++) tab_mu_sur_Sc(i,0) = tab_rho(i,0)*diff_coeff_;
    }
  else
    {
      Cerr << "We should not have a mu_sur_Sc of type Champ_Uniforme !" << finl;
      Process::exit();
    }
 
  double temps_champ = rho.temps();
  mu_sur_Sc.changer_temps(temps_champ);
  tab_mu_sur_Sc.echange_espace_virtuel();
}
 
/*! @brief Computes the kinematic viscosity divided by the Schmidt number (D).
 *
 */
void Loi_Etat_Binaire_GP_base::calculer_nu_sur_Sc()
{
  /*
   * ====================================================================
   * Schmidt number : Sc = nu / D
   * => D = nu/Sc
   * ====================================================================
   */
 
  Champ_Don_base& nu_sur_Sc = le_fluide->nu_sur_Schmidt();
  DoubleTab& tab_nu_sur_Sc = nu_sur_Sc.valeurs();
  const int n=tab_nu_sur_Sc.size();
 
  for (int i=0 ; i<n ; i++) tab_nu_sur_Sc(i,0) = diff_coeff_;
 
  double temps_champ = le_fluide->masse_volumique().temps();
  nu_sur_Sc.changer_temps(temps_champ);
  tab_nu_sur_Sc.echange_espace_virtuel();
}
 
/*! @brief Computes Cp. Does nothing: Cp is constant.
 *
 */
void Loi_Etat_Binaire_GP_base::calculer_Cp()
{
  /* Do nothing */
}
 
/*! @brief Returns the type of fluid associated.
 *
 * @return The fluid type name ("Melange_Binaire").
 */
const Nom Loi_Etat_Binaire_GP_base::type_fluide() const
{
  return "Melange_Binaire";
}
 
/*! @brief Computes the thermodynamic pressure from temperature and density.
 *
 */
double Loi_Etat_Binaire_GP_base::inverser_Pth(double Y1, double rho)
{
  /*
  // THIS IS OK, but we dont want to enter here !
  double RToM2 = R_GAS*tempr_/massmol2_;
  double mix = 1.0+Y1*(massmol2_/massmol1_-1.0);
  double p_t = rho * RToM2 * mix ;
 
  return p_t;
  */
  Cerr << "We should not enter in the method Loi_Etat_Binaire_GP_base::inverser_Pth !" << finl;
  Cerr << "This means that you are trying to solve an ODE for pth which is forbidden for this EOS!" << finl;
  abort();
  throw;
}
 
double Loi_Etat_Binaire_GP_base::calculer_masse_volumique(double P, double Y1) const
{
  /*
   * Mixing species state equation
   * ===========================================================================
   * rho = ( P * M_mix ) / ( R * T)
   * with M_mix = 1 / (Y1/M1 + Y2/M2) = = M2 / (M2Y1/M1 + Y2)
   * But Y2 = 1 - Y1 => M_mix = M2 / (M2Y1/M1 + 1 -Y1) = M2 / (1 + Y1(M2/M1 -1))
   * ===========================================================================
   * See https://doi.org/10.1016/j.ijheatmasstransfer.2020.120470
  */
  const double PM2 = P*massmol2_;
  const double RT = R_GAS*tempr_;
  const double mix = 1.0+Y1*(massmol2_/massmol1_-1.0);
  const double rh = PM2/(RT*mix);
 
  return rh;
}