Multiplicateur_diphasique_Friedel.cpp

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#include <Multiplicateur_diphasique_Friedel.h>
#include <Pb_Multiphase.h>
#include <cmath>
 
Implemente_instanciable(Multiplicateur_diphasique_Friedel, "Multiplicateur_diphasique_Friedel", Multiplicateur_diphasique_base);
 
Sortie& Multiplicateur_diphasique_Friedel::printOn(Sortie& os) const
{
  return os;
}
 
Entree& Multiplicateur_diphasique_Friedel::readOn(Entree& is)
{
  Param param(que_suis_je());
  param.ajouter("alpha_min", &alpha_min_);
  param.ajouter("alpha_max", &alpha_max_);
  param.ajouter("min_lottes_flinn", &min_lottes_flinn_);
  param.ajouter("min_sensas", &min_sensas_);
  param.lire_avec_accolades_depuis(is);
 
  const Pb_Multiphase *pbm = sub_type(Pb_Multiphase, pb_.valeur()) ? &ref_cast(Pb_Multiphase, pb_.valeur()) : nullptr;
 
  if (!pbm || pbm->nb_phases() == 1) n_l = 0, n_g = -1; //pas un Pb_Multiphase -> monophasique liquide
  else for (int n = 0; n < pbm->nb_phases(); n++) //recherche de n_l, n_g : phase {liquide,gaz}_continu en priorite
      if (pbm->nom_phase(n).debute_par("liquide") && (n_l < 0 || pbm->nom_phase(n).finit_par("continu")))  n_l = n;
      else if (pbm->nom_phase(n).debute_par("gaz") && (n_g < 0 || pbm->nom_phase(n).finit_par("continu"))) n_g = n;
 
  if (n_l < 0) Process::exit(que_suis_je() + " : main phase not found!");
 
  return is;
}
 
void Multiplicateur_diphasique_Friedel::coefficient(const double *alpha, const double *rho, const double *v, const double *f,
                                                    const double *mu, const double Dh, const double sigma, const double *Fk,
                                                    const double Fm, DoubleTab& coeff) const
{
  int min_ = min_sensas_ || min_lottes_flinn_;
  double G = alpha[n_l] * rho[n_l] * std::fabs(v[n_l]) + alpha[n_g] * rho[n_g] * std::fabs(v[n_g]), //debit total
         x = G ? alpha[n_g] * rho[n_g] * v[n_g] / G : 0, //titre
         E = (1 - x) * (1 - x) + x * x * (rho[n_l] * f[n_g] / rho[n_g] / f[n_l]),
         F = std::pow(x, 0.78) * std::pow(1 - x, 0.224),
         H = std::pow(rho[n_l] / rho[n_g], 0.91) * std::pow(mu[n_g] / mu[n_l], 0.19) * std::pow(1 - mu[n_g] / mu[n_l], 0.7),
         rho_m = 1.0 / (x / rho[n_g] + (1.0 - x) / rho[n_l]), //masse volumlque du melange
         Fr = G * G / (9.81 * Dh * rho_m * rho_m), We = G * G * Dh / (sigma * rho_m), //Froude, Weber,
         Phi2 = E + 3.24 * F * H * std::pow(Fr, -0.0454) * std::pow(We, -0.035), //le multiplicateur!
         frac_g = std::min(std::max((alpha[n_g] - alpha_min_) / (alpha_max_ - alpha_min_), 0.), 1.), frac_l = 1 - frac_g, //fraction appliquee a la vapeur
         mul = min_sensas_ ? std::min(1., 1.4429 * std::pow(alpha[n_l], 0.6492)) : 1;
  coeff = 0;
  if (min_ && Fk[n_l] * mul < Phi2 * Fm * (alpha[n_l] * alpha[n_l])) /* Lottes-Flinn/SENSAS sur le liquide donne un frottement plus bas -> on le prend*/
    coeff(n_l, 0) = frac_l * min_ / (alpha[n_l] * alpha[n_l]), coeff(n_g, 0) = frac_g * min_ / (alpha[n_l] * alpha[n_l]);
  else  coeff(n_l, 1) = frac_l * Phi2, coeff(n_g, 1) = frac_g * Phi2; //application au liquide et/ou a la vapeur
}