Loi_Etat_GR_base.cpp

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#include <Fluide_Quasi_Compressible.h>
#include <Loi_Etat_GR_base.h>
#include <Champ_Uniforme.h>
#include <Motcle.h>
 
Implemente_base_sans_constructeur(Loi_Etat_GR_base,"Loi_Etat_Gaz_Reel_base",Loi_Etat_base);
// XD loi_etat_gaz_reel_base loi_etat_base loi_etat_gaz_reel_base INHERITS_BRACE Basic class for real gases state laws
// XD_CONT used with a dilatable fluid.
 
Loi_Etat_GR_base::Loi_Etat_GR_base() : MMole_(-1),Cp_(-1),R(-1) { }
 
Sortie& Loi_Etat_GR_base::printOn(Sortie& os) const
{
  os <<que_suis_je()<< finl;
  return os;
}
 
Entree& Loi_Etat_GR_base::readOn(Entree& is)
{
  return is;
}
 
/*! @brief Returns the type of fluid associated.
 *
 * @return The fluid type name ("Gaz_Reel").
 */
const Nom Loi_Etat_GR_base::type_fluide() const
{
  return "Gaz_Reel";
}
 
/*! @brief Initialises the state law by computing Pth.
 *
 */
void Loi_Etat_GR_base::initialiser()
{
  le_fluide->inco_chaleur().nommer("enthalpie");
 
  const DoubleTab& tab_H = le_fluide->inco_chaleur().valeurs();
  const DoubleTab& tab_rho = le_fluide->masse_volumique().valeurs();
  int i, n = tab_H.dimension(0);
  DoubleTab& tab_T = temperature_->valeurs();
  tab_TempC.resize(n);
  double Pth = le_fluide->pression_th();
  for (i=0 ; i<n ; i++)
    {
      tab_rho_n(i) = tab_rho(i,0);
      tab_TempC(i) = calculer_temperature(Pth,tab_H(i,0));
      tab_T(i) = tab_TempC(i);
    }
  tab_Cp.ref(le_fluide->capacite_calorifique().valeurs());
  calculer_Cp();
}
 
/*! @brief Initialises the enthalpy unknown.
 *
 */
void Loi_Etat_GR_base::initialiser_inco_ch()
{
  /*
   * XXX XXX XXX
   * The heat unknown inco_chaleur is first filled with the initial temperature.
   * It must be converted to enthalpy;
   * the data are the density and the temperature,
   * so enthalpy and pressure must be computed.
   */
 
  DoubleTab& tab_TH = le_fluide->inco_chaleur().valeurs();
  double Pth = le_fluide->pression_th();
  DoubleTab& tab_rho = le_fluide->masse_volumique().valeurs();
  tab_rho_n=tab_rho;
  tab_rho_np1=tab_rho;
  int som,n = tab_TH.dimension(0);
  if (le_fluide->inco_chaleur().le_nom() == "enthalpie")
    {
      for (som=0 ; som<n ; som++)
        tab_rho_np1(som) = tab_rho(som,0) = tab_rho_n(som) = calculer_masse_volumique(Pth,tab_TH(som,0));
    }
  else
    {
      for (som=0 ; som<n ; som++)
        {
          tab_TH(som,0) = calculer_H(Pth,tab_TH(som,0));
          tab_rho_np1(som) = tab_rho(som,0) = tab_rho_n(som) = calculer_masse_volumique(Pth,tab_TH(som,0));
        }
    }
  Cerr<<"FIN Loi_Etat_GR_base::initialiser_H Pth = "<<Pth<<"  H = "<<tab_TH(0,0)<<finl;
}
 
/*! @brief Fills the temperature array from the enthalpy unknown.
 *
 */
void Loi_Etat_GR_base::remplir_T()
{
  const DoubleTab& tab_H = le_fluide->inco_chaleur().valeurs();
  int i, n = tab_TempC.dimension(0);
  DoubleTab& tab_T = temperature_->valeurs();
  double Pth = le_fluide->pression_th();
  for (i=0 ; i<n ; i++)
    {
      tab_TempC(i) = calculer_temperature(Pth,tab_H(i,0));
      tab_T(i,0) = tab_TempC(i);
    }
}
 
/*! @brief Computes Cp as a function of physical quantities P and h.
 *         Cp = dh/dT = de/dT - 1/rho^2 * drho/dT
 *
 * @param P Pressure.
 * @param h Enthalpy.
 * @return Computed Cp value.
 */
double Loi_Etat_GR_base::Cp_calc(double P, double h) const
{
  double res;
  if (R==-1) res = 1./(DT_DH(P,h));
  else res = Cp_;
 
  return res;
}
 
/*! @brief Computes Cp using the PolyCp_ polynomial.
 *
 */
void Loi_Etat_GR_base::calculer_Cp()
{
  double Pth = le_fluide->pression_th();
  const DoubleTab& tab_h = le_fluide->inco_chaleur().valeurs();
  for (int i=0; i<tab_Cp.size(); i++) tab_Cp(i) = Cp_calc(Pth,tab_h(i,0));
}
 
/*! @brief Computes the conductivity divided by Cp: equivalent to k*dT/dh for using enthalpy in the diffusion operator.
 *
 */
void Loi_Etat_GR_base::calculer_lambda()
{
  const Champ_Don_base& mu = le_fluide->viscosite_dynamique();
  const DoubleTab& tab_mu = mu.valeurs();
  Champ_Don_base& lambda = le_fluide->conductivite();
  DoubleTab& tab_lambda = lambda.valeurs();
 
  int i, n=tab_lambda.size();
  if (!sub_type(Champ_Uniforme,lambda))
    {
      if (sub_type(Champ_Uniforme,mu))
        {
          for (i=0 ; i<n ; i++) tab_lambda(i,0) = tab_mu(0,0) * tab_Cp(i) / Pr_;
        }
      else
        {
          for (i=0 ; i<n ; i++) tab_lambda(i,0) = tab_mu(i,0) * tab_Cp(i) / Pr_;
        }
    }
}
 
double Loi_Etat_GR_base::De_DP(double P, double T) const
{
  double res = 0;
  Cerr<<"Loi_Etat_GR_base::De_DP non accede normalement"<<finl;
  abort();
  return res;
}
double Loi_Etat_GR_base::De_DT(double P, double T) const
{
  double res = 0;
  Cerr<<"Loi_Etat_GR_base::De_DP non accede normalement"<<finl;
  abort();
  return res;
}
 
/*! @brief Computes the thermodynamic pressure from enthalpy and density by Newton iteration.
 *
 * @param H Enthalpy.
 * @param rho Density.
 * @return Thermodynamic pressure Pth.
 */
double Loi_Etat_GR_base::inverser_Pth(double H, double rho)
{
  double P = le_fluide->pression_th();
  double acc = (calculer_masse_volumique(P,H) - rho) / Drho_DP(P,H);
  int i=0;
  while (std::fabs(acc)>1e-8 && i<1000)
    {
      P = P-acc;
      acc = (calculer_masse_volumique(P,H) - rho) / Drho_DP(P,H);
      i++;
    }
  if (std::fabs(acc)>1e-8)
    {
      Cerr<<"Problem in the pressure inversion: nb_iter="<<i<<finl;
      Cerr<<" Pth="<<P<<" H="<<H<<" rho="<<rho<<finl;
      abort();
    }
  return P;
}
 
void Loi_Etat_GR_base::calculer_masse_volumique()
{
  Loi_Etat_base::calculer_masse_volumique();
}