Frottement_interfacial_Weber.cpp

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#include <Frottement_interfacial_Weber.h>
#include <Pb_Multiphase.h>
 
Implemente_instanciable(Frottement_interfacial_Weber, "Frottement_interfacial_Weber", Frottement_interfacial_base);
 
Sortie& Frottement_interfacial_Weber::printOn(Sortie& os) const
{
  return os;
}
 
Entree& Frottement_interfacial_Weber::readOn(Entree& is)
{
  /* lecture du nombre de Weber critique */
  Param param(que_suis_je());
  param.ajouter("Weber_critique", &We_c);
  param.lire_avec_accolades_depuis(is);
 
  //phase identification
  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++) //search for n_l, n_g: continuous {liquid,gas} phase with priority
    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_Weber::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
{
  int N = ref_cast(Pb_Multiphase, pb_.valeur()).nb_phases();
  int ind_trav = (n_g>n_l) ? (n_l*(N-1)-(n_l-1)*(n_l)/2) + (n_g-n_l-1) : (n_g*(N-1)-(n_g-1)*(n_g)/2) + (n_l-n_g-1);
 
  double Db = We_c * sigma(ind_trav) / (rho(n_l) * ndv(n_l, n_g) * ndv(n_l, n_g)),                  //bubble diameter
         Reb = rho(n_l) * ndv(n_l, n_g) * Db / mu(n_l),                                             //bubble Reynolds number
         Cx = 24. / Reb * (1. + 0.1 * pow(Reb, 0.75));                                              //drag coefficient
 
  const double pi=2.*acos(0.);
  coeff = 0;
  coeff(n_l, n_g, 1) = coeff(n_g, n_l, 1) = 6. * alpha(n_g) / (pi * pow(Db, 3.)) * Cx ;
  coeff(n_l, n_g, 0) = coeff(n_g, n_l, 0) = coeff(n_l, n_g, 1) * ndv(n_l, n_g);
}