Diffu_lm.cpp

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#include <Diffu_lm.h>
#include <Fluide_base.h>
#include <MuLambda_TBLE_base.h>
 
Implemente_instanciable(Diffu_lm,"Diffu_lm",Diffu_totale_hyd_base);
 
 
const double Diffu_lm::A_plus=25.;
 
Sortie& Diffu_lm::printOn(Sortie& os) const
{
  return os ;
}
 
Entree& Diffu_lm::readOn( Entree& is)
{
  return is ;
}
 
//////////////////////////////////////////////////////////////////////////////////////////////////////////
//// Cette methode determine la diffusivite totale a en un point donne du maillage fin de Eq_couch_lim ///
//////////////////////////////////////////////////////////////////////////////////////////////////////////
 
// Si la composante du cisaillement a la paroi est dans le sens de l'ecoulement
 
double Diffu_lm::calculer_a_local(int ind)
{
  // OC : 02/2006 ; on pourrait peut etre remplacer ce "calculer_a_local" par un "calculer_a_global", ce qui eviterait de multiples appels, surement couteux, a cette methode.
 
  double yw, y_plus, a, Damp, S_norm ;
  double yw_N, y_plus_N, S_norm_N, Damp_N ;
 
  //S_norm est la norme de Sij sur le maillage fin
  //Damp est une fonction de damping
  //u_tau : vitesse de frottement
 
  int N;
  double kappa = -123;
  Eq_couch_lim& leq = eq_couch_lim.valeur();
  double visco_cin = mu_lambda->getNu(eq_couch_lim_T, ind);
  double visco_cin2 = mu_lambda->getNu(eq_couch_lim_T, ind+1);
  double visco_turb = 0.;
  int nb_comp = leq.get_N_comp();
 
 
  N = leq.get_N();
 
  yw = 0.5*(leq.get_y(ind+1)+leq.get_y(ind));
  y_plus = yw*leq.get_utau_old()/(0.5*(visco_cin+visco_cin2));
  Damp = 1-exp(pow(-y_plus/A_plus,3)); // Damp1
  //Damp = pow(1-exp(-y_plus/A_plus),2); // Damp2
 
  if(leq.get_nu_t_dyn() == 0)
    {
      kappa=getKappa();
    }
  else
    {
      double visco_cin_N = 0.5*(mu_lambda->getNu(eq_couch_lim_T, N-1)+mu_lambda->getNu(eq_couch_lim_T, N));
      yw_N = 0.5*(leq.get_y(N)+leq.get_y(N-1));
      y_plus_N = yw_N*leq.get_utau_old()/visco_cin_N;
      //Damp_N = 1-exp(pow(-y_plus_N/A_plus,3)); // Damp1
      Damp_N = pow(1-exp(-y_plus_N/A_plus),2); // Damp2
 
      S_norm_N = 0.;
      double tmp=0.;
      for (int icomp=0; icomp<nb_comp; icomp++)
        {
          tmp = (leq.get_Unp1(icomp,N) - leq.get_Unp1(icomp,N-1))/(leq.get_y(N)-leq.get_y(N-1));
          S_norm_N += tmp*tmp;
        }
      S_norm_N=sqrt(S_norm_N);
      //      kappa = (1./yw_N)*sqrt(leq.get_nu_t_yn()/(Damp_N*S_norm_N));
      kappa = leq.get_nu_t_yn()/(y_plus_N*visco_cin_N*Damp_N);
 
      if(kappa > getKappa())
        kappa = getKappa();
      else if(kappa < 0.)
        kappa = 0;
    }
 
  if(ind==0)
    {
      a = visco_cin;
    }
  else
    {
      //Norme de Sij
      S_norm = 0.;
      double tmp=0.;
      for (int icomp=0; icomp<nb_comp; icomp++)
        {
          tmp = (leq.get_Unp1(icomp,ind+1) - leq.get_Unp1(icomp,ind))/(leq.get_y(ind+1)-leq.get_y(ind));
          S_norm += tmp*tmp;
        }
      S_norm=sqrt(S_norm);
 
      visco_turb = kappa*kappa*yw*yw*S_norm*Damp;
      //visco_turb = kappa*y_plus*visco_cin*Damp;
      a = visco_cin + visco_turb;
    }
  return a;
}
 
/////////////////////////////////////////////////////////////////////////////////////
//                                                                                 //
//  La viscosite turbulente est calculee grace a un modele de longueur de melange ://
//  nu_t = (kappa*y)^2*Damp*|S|                                                     //
//  Cette formulation est proposee dans l'article de Balaras et al.                //
//  AIAA journal vol. 34, no 6, 1996                                               //
//                                                                                 //
/////////////////////////////////////////////////////////////////////////////////////
 
//////////////////////////////////////////////
//Calcul de la fonction de damping uniquement
//Attention : Ne pas integrer !!!
//////////////////////////////////////////////
double Diffu_lm::calculer_D_local(int ind)
{
 
  double yw, y_plus, Damp ;
 
  //Damp est une fonction de damping
  //u_tau : vitesse de frottement
 
 
  Eq_couch_lim& leq = eq_couch_lim.valeur();
  const Milieu_base& le_milieu = leq.get_milieu();
  const Fluide_base& le_fluide = ref_cast(Fluide_base, le_milieu);
  const Champ_Don_base& ch_visco_cin = le_fluide.viscosite_cinematique();
  const DoubleTab& tab_visco = ch_visco_cin.valeurs();
 
  double visco_cin = std::max(tab_visco(0,0),DMINFLOAT);//visco cinematique supposee cste
 
  yw = 0.5*(leq.get_y(ind+1)+leq.get_y(ind));
  y_plus = yw*leq.get_utau_old()/visco_cin;
  Damp = 1-exp(pow(-y_plus/A_plus,3)); // Damp1
 
  return Damp;
}