Transport_turbulent_SGDH_WIT.cpp

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#include <Transport_turbulent_SGDH_WIT.h>
#include <Param.h>
#include <Probleme_base.h>
 
#include <Pb_Multiphase.h>
#include <TRUSTTrav.h>
 
Implemente_instanciable(Transport_turbulent_SGDH_WIT, "Transport_turbulent_SGDH_WIT", Transport_turbulent_base);
 
Sortie& Transport_turbulent_SGDH_WIT::printOn(Sortie& os) const
{
  return os;
}
 
Entree& Transport_turbulent_SGDH_WIT::readOn(Entree& is)
{
  Param param(que_suis_je());
  param.ajouter("Aspect_ratio", &gamma_);   // rapport d'aspet des bulles
  param.ajouter("Influence_area", &delta_); // paramètre modèle d'Alméras 2014 (taille du sillage)
  param.ajouter("C_s", &C_s_);               // paramètre modèle d'Alméras 2014
  param.lire_avec_accolades_depuis(is);
  return is;
}
 
// Modifier_nu modifie mu : alpha et rho font partie du terme
void Transport_turbulent_SGDH_WIT::modifier_mu(const Convection_Diffusion_std& eq,
                                               const Viscosite_turbulente_base& visc_turb,
                                               DoubleTab& nu) const
{
  // Cette methode calcule la diffusivité nu de k_WIT avec nu = 2/3 * delta^(-3) * d_bulles / (gamma^(2/3) * alpha * ur)  (voir Alméras 2014)
  const DoubleTab& mu0 = eq.diffusivite_pour_transport().passe();
  const DoubleTab& nu0 = eq.diffusivite_pour_pas_de_temps().passe(); //viscosites moleculaires
  const DoubleTab& alp = pb_->get_champ("alpha").passe();
  const DoubleTab& diam = pb_->get_champ("diametre_bulles").valeurs();
  const DoubleTab& tab_u = pb_->get_champ("vitesse").passe();
 
  const int nl = nu.dimension(0);
  const int N = alp.dimension(1);
  const int D = dimension;
 
  // Calcul de la vitesse relative
  DoubleTrav Rij(0, N, D, D);
  MD_Vector_tools::creer_tableau_distribue(nu.get_md_vector(), Rij);
 
  ConstDoubleTab_parts p_u(tab_u); //en PolyMAC_MPFA, tab_u contient (nf.u) aux faces, puis (u_i) aux elements
  int i_part = -1;
  for (int i = 0; i < p_u.size(); i++)
    if (p_u[i].get_md_vector() == Rij.get_md_vector())
      i_part = i; //on cherche une partie ayant le meme support
  if (i_part < 0)
    Process::exit("Transport_turbulent_SGDH_WIT : inconsistency between velocity and Rij!");
 
  const DoubleTab& u = p_u[i_part]; //le bon tableau
  DoubleTrav u_r(u.dimension(0), 1);
  for (int i = 0; i < u_r.dimension(0); i++)
    {
      for (int d = 0; d < D; d++)
        u_r(i, 0) += (u(i, d, 1) - u(i, d, 0))*(u(i, d, 1) - u(i, d, 0)); // relative speed = gas speed - liquid speed
      u_r(i, 0) = std::sqrt(u_r(i, 0));
    }
 
  // formule pour passer de nu a mu : mu0 / nu0 * C_s_ * temps_carac
  for (int i = 0; i < nl; i++)
    {
      const double tmp1 = 1./(delta_*delta_*delta_)*diam(i, 1);
      const double tmp2 = pow(gamma_, 2./3.)*alp(i, 1)*u_r(i,0);
      const double temps_carac = (u_r(i, 0) != 0) ? 2./3. * tmp1 / tmp2 : 0; // si u_r=0 alors pas de WIT donc pas de diffusion du WIT
      nu(i, 0) = mu0(i, 0) / nu0(i, 0) * C_s_ * temps_carac ; // ici mu0/nu0 = 1 car l'inconnue de l'équation est k_WIT (voir Energie_cinetique_turbulente_WIT.cpp)
    }
}