Loi_paroi_log.cpp

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#include <Discretisation_base.h>
#include <Navier_Stokes_std.h>
#include <Correlation_base.h>
#include <Champ_Face_base.h>
#include <QDM_Multiphase.h>
#include <TRUSTTab_parts.h>
#include <Cond_lim_base.h>
#include <Pb_Multiphase.h>
#include <Loi_paroi_log.h>
#include <Domaine_VF.h>
#include <TRUSTTrav.h>
#include <Motcle.h>
#include <Param.h>
#include <math.h>
#include <Nom.h>
 
Implemente_instanciable(Loi_paroi_log, "Loi_paroi_log", Loi_paroi_base);
 
Sortie& Loi_paroi_log::printOn(Sortie& os) const
{
  return os;
}
 
Entree& Loi_paroi_log::readOn(Entree& is)
{
  return Loi_paroi_base::readOn(is);
}
 
void Loi_paroi_log::calc_y_plus(const DoubleTab& vit, const DoubleTab& nu_visc)
{
  const int cnu = nu_visc.dimension(0) == 1;
  Domaine_VF& domaine = ref_cast(Domaine_VF, pb_->domaine_dis());
  DoubleTab& u_t = valeurs_loi_paroi_["u_tau"], &y_p = valeurs_loi_paroi_["y_plus"], &y_loc = valeurs_loi_paroi_["y"];
  const DoubleTab& n_f = domaine.face_normales();
  const DoubleVect& fs = domaine.face_surfaces();
  const IntTab& f_e = domaine.face_voisins();
 
  const bool is_VDF = pb_->discretisation().is_vdf();
 
  int nf_tot = domaine.nb_faces_tot(), D = dimension, N = vit.line_size();
 
  DoubleTab pvit_elem(0, N * D);
  if (is_VDF)
    {
      const Champ_Face_base& ch = ref_cast(Champ_Face_base, pb_->equation(0).inconnue());
      domaine.domaine().creer_tableau_elements(pvit_elem);
      ch.get_elem_vector_field(pvit_elem, true);
    }
 
  int n = 0; // pour l'instant, turbulence dans seulement une phase
 
  for (int f = 0; f < nf_tot; f++)
    if (Faces_a_calculer_(f, 0) == 1)
      {
        int c = (f_e(f, 0) >= 0) ? 0 : 1;
        if (f_e(f, (c == 0) ? 1 : 0) >= 0)
          Process::exit("Error in the definition of the boundary conditions for wall laws");
        int e = f_e(f, c);
 
        double u_orth = 0.;
        const double yloc = y_loc(f, n);
        DoubleTrav u_parallel(D);
        if (is_VDF) // VDF case : vitesse au centre de l'element
          {
            for (int d = 0; d < D; d++)
              u_orth -= pvit_elem(e, N * d + n) * n_f(f, d) / fs(f); // ! n_f pointe vers la face 1 donc vers l'exterieur de l'element, d'ou le -
            for (int d = 0; d < D; d++)
              u_parallel(d) = pvit_elem(e, N * d + n) - u_orth * (-n_f(f, d)) / fs(f); // ! n_f pointe vers la face 1 donc vers l'exterieur de l'element, d'ou le -
          }
        else // PolyMAC_CDO case
          {
            for (int d = 0; d < D; d++)
              u_orth -= vit(nf_tot + e * D + d, n) * n_f(f, d) / fs(f); // ! n_f pointe vers la face 1 donc vers l'exterieur de l'element, d'ou le -
            for (int d = 0; d < D; d++)
              u_parallel(d) = vit(nf_tot + e * D + d, n) - u_orth * (-n_f(f, d)) / fs(f); // ! n_f pointe vers la face 1 donc vers l'exterieur de l'element, d'ou le -
          }
 
        double norm_u_parallel = std::sqrt(domaine.dot(&u_parallel(0), &u_parallel(0)));
 
        // double residu = 0 ;
        // for (int d = 0; d <D ; d++) residu += u_parallel(d)*n_f(f,d)/fs(f);
        // if (residu > 1e-8) Process::exit("Loi_paroi_adaptative : Error in the calculation of the parallel velocity for wall laws");
 
        y_p(f, n) = std::max(y_p_min_, calc_y_plus_loc(norm_u_parallel, nu_visc(!cnu * e, n), yloc, y_p(f, n)));
        u_t(f, n) = y_p(f, n) * nu_visc(!cnu * e, n) / yloc;
      }
}
 
double Loi_paroi_log::calc_y_plus_loc(double u_par, double nu, double y, double y_p_0)
{
  if (u_par * y / nu < limiteur_y_p)
    return limiteur_y_p;
 
  double eps = eps_y_p_;
  int step = 1, iter_max = 30;
 
  double y_p = y_p_0;
  double u_tau = nu * y_p / y;
 
  do
    {
      y_p = std::max(limiteur_y_p, y_p - (u_plus_de_y_plus(y_p) - u_par / u_tau) / (deriv_u_plus_de_y_plus(y_p) + u_par / (u_tau * y_p)));
      step = step + 1;
      u_tau = nu * y_p / y;
    }
  while ((std::fabs(u_plus_de_y_plus(y_p) - u_par / u_tau) > eps) and (step < iter_max));
 
  assert((std::fabs(u_par / u_tau - u_plus_de_y_plus(y_p)) < eps_y_p_ * 10) and (step < iter_max));
 
  return y_p;
}
 
double Loi_paroi_log::u_plus_de_y_plus(double y_p)  // Blended Reichardt model
{
  return std::log(y_p + limiteur_y_p) / von_karman_ + 5.1;
}
 
double Loi_paroi_log::deriv_u_plus_de_y_plus(double y_p)
{
  return 1. / ((y_p + limiteur_y_p) * von_karman_);
}