Viscosite_turbulente_sato.cpp

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#include <Viscosite_turbulente_sato.h>
#include <Pb_Multiphase.h>
#include <Masse_ajoutee_base.h>
#include <TRUSTTab_parts.h>
#include <Probleme_base.h>
#include <Champ_base.h>
#include <Param.h>
#include <Champ_Face_PolyMAC_MPFA.h>
 
Implemente_instanciable(Viscosite_turbulente_sato, "Viscosite_turbulente_sato", Viscosite_turbulente_base);
 
Sortie& Viscosite_turbulente_sato::printOn(Sortie& os) const
{
  return os;
}
 
Entree& Viscosite_turbulente_sato::readOn(Entree& is)
{
  Param param(que_suis_je());
  param.ajouter("coef_sato", &coef_sato_);
  param.lire_avec_accolades_depuis(is);
 
  //identification des phases
  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;
 
  if (n_l_ < 0)
    Process::exit(que_suis_je() + " : liquid phase not found!");
 
  pbm->creer_champ("distance_paroi_globale"); // Besoin de distance a la paroi
 
  return is;
}
 
void Viscosite_turbulente_sato::eddy_viscosity(DoubleTab& nu_t) const
{
  nu_t = 0; // La contribution de nu_sato est ajouter via un terme source dans la qdm
}
 
void Viscosite_turbulente_sato::reynolds_stress(DoubleTab& R_ij) const // Renvoie <u_i'u_j'>
{
 
  // Récupère les champs de vitesse - alpha - d_bulles (diamètre des bulles) - grad vitesse
  const Pb_Multiphase* pbm = sub_type(Pb_Multiphase, pb_.valeur()) ? &ref_cast(Pb_Multiphase, pb_.valeur()) : nullptr ;
  const Domaine_PolyMAC_MPFA& domaine = ref_cast(Domaine_PolyMAC_MPFA, pb_->domaine_dis());
  const DoubleTab& tab_u = pb_->get_champ("vitesse").passe();
  const DoubleTab& d_bulles = pb_->get_champ("diametre_bulles").passe();
  const DoubleTab& alpha = pb_->get_champ("alpha").passe();
  const DoubleTab& tab_grad = pbm->get_champ("gradient_vitesse").passe();
 
  const int D = dimension;
  const int nf_tot = domaine.nb_faces_tot();
  const int N = alpha.dimension(1);
 
  // Champ de vitesse
  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() == R_ij.get_md_vector())
      i_part = i; //on cherche une partie ayant le meme support
 
  if (i_part < 0)
    Process::exit("Viscosite_turbulente_sato : inconsistency between velocity and Rij!");
 
  const DoubleTab& u = p_u[i_part]; //le bon tableau
 
  // vitesse relative
  DoubleTrav u_r(R_ij.dimension(0), 1);
 
  // Tenseur Reynolds de Sato
  for (int e = 0 ; e < R_ij.dimension(0); e++)  // elements
    for (int i = 0; i < D; i++)                 // dimension i
      for (int j = 0; j < D; j++)               // dimension j
        for (int k = 0; k < N; k++)             // phases
          if (k != n_l_)                         // iteration sur phases gazeuses
            {
              // Compute the relative velocity norm
              double u_r_carre = 0.;
              for (int d = 0; d < D; d++)
                u_r_carre += (u(e, d, k) - u(e, d, n_l_))*(u(e, d, k) - u(e, d, n_l_)); // relative speed = gas speed - liquid speed
              u_r(e, 0) = std::sqrt(u_r_carre);
 
              // Compute Sato eddy viscosity
              const double nu_sato = coef_sato_ * alpha(e, k) * d_bulles(e, k) * u_r(e,0);
 
              // Tenseur des taux de déformations Sij = gradv_ij + gradv_ji (facteur 1/2 supprimé car il se simplifie après)
              const double S_ij = tab_grad(nf_tot + i + e * D , D * n_l_ + j) + tab_grad(nf_tot + j + e * D , D * n_l_ + i);
 
              // Tenseur de Reynolds BIA
              R_ij(e, k, i, j) = 0 ; // No BIT for gas phase
              R_ij(e, 0, i, j) -= nu_sato * S_ij; // <u_i'u_j'> = - nu_sato * S_ij
            }
}
 
void Viscosite_turbulente_sato::k_over_eps(DoubleTab& k_sur_eps) const
{
  k_sur_eps = 0;
}
 
void Viscosite_turbulente_sato::eps(DoubleTab& eps_) const
{
  eps_ = 0;
}