Frottement_interfacial_Sonnenburg.cpp

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#include <Frottement_interfacial_Sonnenburg.h>
#include <Pb_Multiphase.h>
#include <cmath>
 
Implemente_instanciable(Frottement_interfacial_Sonnenburg, "Frottement_interfacial_Sonnenburg", Frottement_interfacial_base);
 
Sortie& Frottement_interfacial_Sonnenburg::printOn(Sortie& os) const
{
  return os;
}
 
Entree& Frottement_interfacial_Sonnenburg::readOn(Entree& is)
{
  /* nothing to read for now */
  Param param(que_suis_je());
  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: {liquid,gas}_continu phase takes 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_Sonnenburg::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
{
  coeff = 0;
  if (alpha(n_l) < 1e-8 || alpha(n_g) < 1e-8) return;
  double a_u = 32, b_u = 9. / 16 * sqrt(rho(n_g) / rho(n_l)), c_u = 40, alp = std::min(std::max(alpha(n_g), 1e-3), 0.999),
         fac = 16. / 9 * (1 - alp * (1 - b_u)) / (tanh(a_u * alp) * (1 - std::pow(alp, c_u)));
  coeff(n_l, n_g, 1) = coeff(n_g, n_l, 1) = alpha(n_l) * alpha(n_g) * rho(n_l) / Dh * fac * fac;
  coeff(n_l, n_g, 0) = coeff(n_g, n_l, 0) = coeff(n_l, n_g, 1) * ndv(n_l, n_g);
}