Frottement_interfacial_Wallis.cpp

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#include <Frottement_interfacial_Wallis.h>
#include <Pb_Multiphase.h>
 
Implemente_instanciable(Frottement_interfacial_Wallis, "Frottement_interfacial_Wallis", Frottement_interfacial_base);
 
Sortie& Frottement_interfacial_Wallis::printOn(Sortie& os) const
{
  return os;
}
 
Entree& Frottement_interfacial_Wallis::readOn(Entree& is)
{
  /* rien a lire pour l'instant */
  Param param(que_suis_je());
  param.lire_avec_accolades_depuis(is);
 
  //identification des phases
  const Pb_Multiphase *pbm = sub_type(Pb_Multiphase, pb_.valeur()) ? &ref_cast(Pb_Multiphase, pb_.valeur()) : nullptr;
  if (!pbm || pbm->nb_phases() == 1) Process::exit(que_suis_je() + " : not needed for single-phase flow!");
  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() + " : liquid phase not found!");
  if (n_g < 0) Process::exit(que_suis_je() + " : gas phase not found!");
 
  return is;
}
 
void Frottement_interfacial_Wallis::coefficient(const DoubleTab& alpha, const DoubleTab& p, const DoubleTab& T,
                                                const DoubleTab& rho, const DoubleTab& mu, const DoubleTab& sigma, double Dh,
                                                const DoubleTab& ndv, const DoubleTab& d_bulles, DoubleTab& coeff) const
{
  double A_i = 4 * sqrt(alpha(n_g)) / Dh, //aire interfaciale
         d_f = Dh / 2 * (1 - sqrt(alpha(n_g))), //epaisseur de film,
         Cf = 0.005 * (1 + 300 * d_f / Dh); //coeff de frottement
  coeff = 0;
  coeff(n_l, n_g, 1) = coeff(n_g, n_l, 1) = A_i * Cf * rho(n_g);
  coeff(n_l, n_g, 0) = coeff(n_g, n_l, 0) = coeff(n_l, n_g, 1) * ndv(n_l, n_g);
}