Paroi_loi_WW_scal_VEF.cpp

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#include <Paroi_loi_WW_scal_VEF.h>
#include <Paroi_std_hyd_VEF.h>
#include <Probleme_base.h>
#include <Champ_Uniforme.h>
#include <Dirichlet_paroi_fixe.h>
#include <Dirichlet_paroi_defilante.h>
#include <Fluide_base.h>
#include <Modele_turbulence_hyd_base.h>
#include <Convection_Diffusion_Concentration.h>
#include <Modele_turbulence_scal_base.h>
#include <Constituant.h>
 
Implemente_instanciable_sans_constructeur(Paroi_loi_WW_scal_VEF,"loi_WW_scalaire_VEF",Paroi_std_scal_hyd_VEF);
 
 
//     printOn()
/////
 
Sortie& Paroi_loi_WW_scal_VEF::printOn(Sortie& s) const
{
  return s << que_suis_je() << " " << le_nom();
}
 
//// readOn
//
 
Entree& Paroi_loi_WW_scal_VEF::readOn(Entree& s)
{
  return s ;
}
 
void Paroi_loi_WW_scal_VEF::associer(const Domaine_dis_base& domaine_dis,const Domaine_Cl_dis_base& domaine_Cl_dis)
{
  le_dom_dis_ = ref_cast(Domaine_VF, domaine_dis);
  le_dom_Cl_dis_ = domaine_Cl_dis;
}
 
/////////////////////////////////////////////////////////////////////////
//
//    Implementation des fonctions de la classe Paroi_loi_WW_scal_VEF
//
////////////////////////////////////////////////////////////////////////
 
// Loi analytique avec raccordement des comportements
// asymptotiques de la temperature adimensionnee T+
// sous-couche conductrice : T+=Pr y+
// domaine logarithmique : T+=2.12*ln(y+)+Beta
 
//// POUR PASSAGE A V1.4.4
//// PROBLEME COMPATIBILITE AVEC DEVELOPPEMENT
//// DE LOI PAROI VEF SCAL DE PATRICK
double FthparVEF_WW(double y_plus,double Pr,double Beta)
{
  static double C_inv = 2.12;
  double Gamma = (0.01*pow(Pr*y_plus,4.))/(1.+5.*pow(Pr,3.)*y_plus);
  double f = Pr*y_plus*exp(-Gamma);
  f += (C_inv*log(1.+y_plus) + Beta)*exp(-1./(Gamma+1e-20));
  return f;
}
 
 
int Paroi_loi_WW_scal_VEF::calculer_scal(Champ_Fonc_base& diffusivite_turb)
{
  const Domaine_VEF& domaine_VEF = ref_cast(Domaine_VEF, le_dom_dis_.valeur());
  DoubleTab& alpha_t = diffusivite_turb.valeurs();
  Equation_base& eqn_hydr = mon_modele_turb_scal->equation().probleme().equation(0);
  const Fluide_base& le_fluide = ref_cast(Fluide_base,eqn_hydr.milieu());
  const Champ_Don_base& ch_visco_cin = le_fluide.viscosite_cinematique();
 
  const DoubleTab& tab_visco = ch_visco_cin.valeurs();
  int l_unif;
 
  if (axi)
    {
      Cerr<<"Attention: the axisymmetric VEF case is not yet implemented"<<finl;
      Cerr<<"in the thermal wall-function. trust will now stop."<<finl;
      Process::exit();
    }
 
  double visco=-1;
  if (sub_type(Champ_Uniforme,ch_visco_cin))
    {
      l_unif = 1;
      visco = std::max(tab_visco(0,0),DMINFLOAT);
    }
  else
    l_unif = 0;
 
  if ((!l_unif) && (tab_visco.local_min_vect()<DMINFLOAT))
    //   on ne doit pas changer tab_visco ici !
    {
      Cerr << "In Paroi_loi_WW_scal_VEF::calculer_scal : visco = " << tab_visco.local_min_vect() << " <= 0 ? " << finl;
      throw;
    }
  //tab_visco+=DMINFLOAT;
 
  int elem;
  double dist;
  double d_visco;
  const RefObjU& modele_turbulence_hydr = eqn_hydr.get_modele(TURBULENCE);
  const Modele_turbulence_hyd_base& le_modele = ref_cast(Modele_turbulence_hyd_base,modele_turbulence_hydr.valeur());
  const Turbulence_paroi_base& loi = le_modele.loi_paroi();
  const DoubleVect& tab_u_star = loi.tab_u_star();
  const Convection_Diffusion_std& eqn = mon_modele_turb_scal->equation();
 
  int schmidt = 0;
  if (sub_type(Convection_Diffusion_Concentration,eqn)) schmidt = 1;
  const Champ_Don_base& alpha = (schmidt==1?ref_cast(Convection_Diffusion_Concentration,eqn).constituant().diffusivite_constituant():le_fluide.diffusivite());
 
  // Boucle sur les bords:
  for (int n_bord=0; n_bord<domaine_VEF.nb_front_Cl(); n_bord++)
    {
 
      // Pour chaque condition limite on regarde son type
      // On applique les lois de paroi thermiques uniquement
      // aux voisinages des parois ou l'on impose la temperature
      // Si l'on est a une paroi adiabatique, le flux a la paroi est connu et nul.
      // Si l'on est a une paroi a flux impose, le flux est connu et il est
      // directement pris a la condition aux limites pour le calcul des flux diffusifs.
 
      const Cond_lim& la_cl = le_dom_Cl_dis_->les_conditions_limites(n_bord);
      if ( (sub_type(Dirichlet_paroi_fixe,la_cl.valeur()))
           || (sub_type(Dirichlet_paroi_defilante,la_cl.valeur())) )
        {
 
          const Front_VF& le_bord = ref_cast(Front_VF,la_cl->frontiere_dis());
          int size=le_bord.nb_faces_tot();
          for (int ind_face=0; ind_face<size; ind_face++)
            {
              int num_face = le_bord.num_face(ind_face);
              const IntTab& face_voisins = domaine_VEF.face_voisins();
 
              // We search the element touching the wall on the face "num_face".
              elem = face_voisins(num_face,0);
              if (elem == -1)
                elem = face_voisins(num_face,1);
 
              // We calculate the distance to the wall of the center of gravity of the element.
              if (dimension == 2)
                dist = distance_2D(num_face,elem,domaine_VEF)*1.5;
              else
                dist = distance_3D(num_face,elem,domaine_VEF)*4./3.;
 
              if (l_unif)
                d_visco = visco;
              else
                d_visco = tab_visco[elem];
              double u_star = tab_u_star(num_face);
              double (*pf)(double,double,double);
              pf = &FthparVEF_WW;
              double d_alpha=0.;
              if (sub_type(Champ_Uniforme,alpha))
                d_alpha = alpha.valeurs()(0,0);
              else
                {
                  if (alpha.nb_comp()==1)
                    d_alpha = alpha.valeurs()(elem);
                  else
                    d_alpha = alpha.valeurs()(elem,0);
                }
              double Pr = d_visco/d_alpha;
              double Beta = pow(3.85*pow(Pr,1./3.)-1.3,2.)+2.12*log(Pr);
 
              // Alex. C. : 28/02/2003
              // We modify the value of the eddy diffusivity in the first off-wall element
              // to have the value given by the theoretical mixing length model.
 
              double y0m=(dist*u_star/d_visco)-0.5;
              double y0p=(dist*u_star/d_visco)+0.5;
              alpha_t(elem)=d_visco/(pf(y0p,Pr,Beta)-pf(y0m,Pr,Beta))-d_alpha;
              if(alpha_t(elem)<0.) alpha_t(elem)=0.; // It means we are in the laminar layer.
              equivalent_distance_[n_bord](ind_face) = (d_alpha+alpha_t(elem))*pf(dist*u_star/d_visco,Pr,Beta)/u_star;
            }
        }
    }
  return 1;
}