Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF.cpp

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#include <Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF.h>
#include <VEF_discretisation.h>
#include <Domaine_VEF.h>
#include <Champ_P1NC.h>
 
Implemente_instanciable_sans_constructeur(Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF, "Modele_turbulence_hyd_sous_maille_1elt_selectif_mod_VEF", Modele_turbulence_hyd_LES_1elt_VEF);
 
Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF::Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF()
{
  Csm1_ = 0.086;
  Csm2_ = 0.6703;  // si CSM1 = 0.086 pour 32^3
}
 
Sortie& Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF::printOn(Sortie& s) const
{
  return s << que_suis_je() << " " << le_nom();
}
 
Entree& Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF::readOn(Entree& s)
{
  return Modele_turbulence_hyd_LES_1elt_VEF::readOn(s);
}
 
void Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF::discretiser()
{
  if (dimension != 3)
    {
      Cerr << "The model sous_maille_1elt_selectif_mod has no sense if dimension is not 3." << finl;
      Process::exit();
    }
  Modele_turbulence_hyd_LES_base::discretiser();
  const VEF_discretisation& dis = ref_cast(VEF_discretisation, mon_equation_->discretisation());
  dis.vorticite(mon_equation_->domaine_dis(), mon_equation_->inconnue(), la_vorticite_);
}
 
int Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF::a_pour_Champ_Fonc(const Motcle& mot,
                                                                       OBS_PTR(Champ_base) &ch_ref) const
{
  Motcles les_motcles(7);
  {
    les_motcles[0] = "viscosite_turbulente";
    les_motcles[1] = "k";
    les_motcles[2] = "vorticite";
 
  }
  int rang = les_motcles.search(mot);
  switch(rang)
    {
    case 0:
      {
        ch_ref = la_viscosite_turbulente_.valeur();
        return 1;
      }
    case 1:
      {
        ch_ref = energie_cinetique_turb_.valeur();
        return 1;
      }
    case 2:
      {
        ch_ref = la_vorticite_.valeur();
        return 1;
      }
    default:
      return 0;
    }
}
 
void Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF::calculer_fonction_structure()
{
  Modele_turbulence_hyd_LES_1elt_VEF::calculer_fonction_structure();
  cutoff();
}
 
// Fonction qui permet d'appliquer un filtre sur la fonction de structure
// La fonction de structure d'un element est mise a zero si il existe une
// deviation inferieure a N degres entre son vecteur vorticite et le
// vecteur moyen des vorticites des 6 elements les plus proches
// l angle de coupure varie en fonction du delta c (regression log)
 
void Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF::cutoff()
{
  double Sin2Angl;
  const Champ_P1NC& vitesse = ref_cast(Champ_P1NC, mon_equation_->inconnue());
  const Domaine_VEF& domaine_VEF = ref_cast(Domaine_VEF, le_dom_VF_.valeur());
  const int nb_elem = domaine_VEF.nb_elem();
  const IntTab& elem_faces = domaine_VEF.elem_faces();
  const IntTab& face_voisins = domaine_VEF.face_voisins();
  //  const Domaine& domaine = domaine_VEF.domaine();
  //  int nfac = domaine.nb_faces_elem();
  //  int nfac = 4; // en 3D 4 faces!!!
  DoubleTab& vorticite = la_vorticite_->valeurs();
  const DoubleTab& xp = domaine_VEF.xp();
 
  la_vorticite_->mettre_a_jour(vitesse.temps());
  vorticite.echange_espace_virtuel();
 
  //  int el0,el1,el2,el3;
  double norme, norme_moyen, prod, angle;  //,delta;
  DoubleVect vorti_moyen(3);
  IntVect elem_nn(4);
  IntVect elem_autour(4);
  DoubleVect dist(4);
  int nb_elem_nn, compteur, elem, k, num_elem;
  double d;
 
  //////**************************************
  // Nouveau modele selectif modifie *********
  //////**************************************
 
  // Pour l'instant, on met k_I en dur !!
  // k_I(0)=5 --> k_I = 3
  static double ki = 2.5;
  double kc, rapport;
 
  for (num_elem = 0; num_elem < nb_elem; num_elem++)
    {
      // Calcul de k_c=(\pi)/(l[elem])
      kc = M_PI / l_[num_elem];
      rapport = kc / ki;
      calculer_angle_limite(rapport, angle);
 
      Sin2Angl = sin(angle);
      Sin2Angl *= Sin2Angl;
 
      elem_autour[0] = face_voisins(elem_faces(num_elem, 0), 0);
      if (elem_autour[0] == num_elem)
        elem_autour[0] = face_voisins(elem_faces(num_elem, 0), 1);
      elem_autour[1] = face_voisins(elem_faces(num_elem, 1), 0);
      if (elem_autour[1] == num_elem)
        elem_autour[1] = face_voisins(elem_faces(num_elem, 1), 1);
      elem_autour[2] = face_voisins(elem_faces(num_elem, 2), 0);
      if (elem_autour[2] == num_elem)
        elem_autour[2] = face_voisins(elem_faces(num_elem, 2), 1);
      elem_autour[3] = face_voisins(elem_faces(num_elem, 3), 0);
      if (elem_autour[3] == num_elem)
        elem_autour[3] = face_voisins(elem_faces(num_elem, 3), 1);
 
      //      double d0,d1,d2,d3,d;
      double x, y, z;
      x = xp(num_elem, 0);
      y = xp(num_elem, 1);
      z = xp(num_elem, 2);
 
      nb_elem_nn = 0;
      elem_nn = 0;
      compteur = 0;
      d = 0.;
 
      while (compteur < 4)  // nb_elem_nn = nbr d elts autour non nuls!!!
        {
          if (elem_autour[compteur] != -1)
            {
              elem_nn[nb_elem_nn] = elem_autour[compteur];
              nb_elem_nn++;
            }
          compteur++;
        }
 
      for (elem = 0; elem < nb_elem_nn; elem++)
        {
          dist[elem] = (x - xp(elem_nn[elem], 0)) * (x - xp(elem_nn[elem], 0)) + (y - xp(elem_nn[elem], 1)) * (y - xp(elem_nn[elem], 1)) + (z - xp(elem_nn[elem], 2)) * (z - xp(elem_nn[elem], 2));
          dist[elem] = 1. / sqrt(dist[elem]);
          d += dist[elem];
        }
 
      vorti_moyen = 0.;
      for (elem = 0; elem < nb_elem_nn; elem++)
        {
          for (k = 0; k < 3; k++)
            vorti_moyen(k) += dist[elem] * vorticite(elem_nn[elem], k) / d;
        }
 
      if (nb_elem_nn == 0)  // Cas d'un element coin ; on met F2 a zero
        // On rend nul le vecteur vorti_moyen(k) ce qui provoquera la mise a zero de F2
        {
          for (k = 0; k < 3; k++)
            vorti_moyen(k) = 0;
        }
 
      // Calcul du produit vectoriel entre la vorticite dans l'element
      // et le vecteur des vorticites des elements voisins
 
      norme = 0;
      int kk;
      for (kk = 0; kk < 3; kk++)
        norme += carre(vorticite(num_elem, kk));
 
      norme_moyen = 0;
      for (kk = 0; kk < 3; kk++)
        norme_moyen += carre(vorti_moyen(kk));
 
      if ((norme > 1.e-10) && (norme_moyen > 1.e-10))
        {
          prod = carre(vorti_moyen(1) * vorticite(num_elem, 2) - vorti_moyen(2) * vorticite(num_elem, 1)) + carre(vorti_moyen(2) * vorticite(num_elem, 0) - vorti_moyen(0) * vorticite(num_elem, 2))
                 + carre(vorti_moyen(0) * vorticite(num_elem, 1) - vorti_moyen(1) * vorticite(num_elem, 0));
          prod /= (norme * norme_moyen);
 
          if (prod <= Sin2Angl)
            F2_(num_elem) = 0;
        }
      else
        // bruit numerique ou element de coin
        F2_(num_elem) = 0;
 
    }
  F2_.echange_espace_virtuel();
}
 
void Modele_turbulence_hyd_LES_1elt_selectif_mod_VEF::calculer_angle_limite(const double rapport, double& angle)
{
  if (rapport < 10.)
    angle = 23. * pow(rapport, -0.4);
  else
    angle = 9.;
 
  angle *= M_PI / 180.;
}