Loi_paroi_Ramstorfer.cpp

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#include <Loi_paroi_Ramstorfer.h>
#include <Correlation_base.h>
#include <Pb_Multiphase.h>
#include <QDM_Multiphase.h>
#include <Navier_Stokes_std.h>
#include <Domaine_Poly_base.h>
#include <TRUSTTrav.h>
#include <Cond_lim_base.h>
#include <Param.h>
#include <math.h>
#include <Nom.h>
#include <Motcle.h>
#include <TRUSTTab_parts.h>
#include <Champ_Face_base.h>
 
Implemente_instanciable(Loi_paroi_Ramstorfer, "Loi_paroi_Ramstorfer", Loi_paroi_base);
 
Sortie& Loi_paroi_Ramstorfer::printOn(Sortie& os) const
{
  return os;
}
 
Entree& Loi_paroi_Ramstorfer::readOn(Entree& is)
{
  return Loi_paroi_base::readOn(is);
}
 
void Loi_paroi_Ramstorfer::completer()
{
  Loi_paroi_base::completer();
 
  const 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() + " : This is a two-phase wall law!");
 
  const DoubleTab * d_bulles = (pb_->has_champ("diametre_bulles")) ? &pb_->get_champ("diametre_bulles").valeurs() : nullptr ;
  if (!d_bulles)
    Process::exit(que_suis_je() + " : you must define a bubble diameter ! This is a two-phase wall law.");
}
 
void Loi_paroi_Ramstorfer::calc_y_plus(const DoubleTab& vit, const DoubleTab& nu_visc)
{
  const Domaine_VF& domaine = ref_cast(Domaine_VF, pb_->domaine_dis());
  DoubleTab& u_t = valeurs_loi_paroi_["u_tau"];
  DoubleTab& y_p = valeurs_loi_paroi_["y_plus"];
  const DoubleTab& n_f = domaine.face_normales();
  const DoubleVect& fs = domaine.face_surfaces();
  const IntTab& f_e = domaine.face_voisins();
  const DoubleTab& d_bulles = pb_->get_champ("diametre_bulles").valeurs();
  const DoubleTab& alpha  = pb_->get_champ("alpha").valeurs();
 
  const int nf_tot = domaine.nb_faces_tot();
  const int D = dimension;
  const int N = vit.line_size();
 
  DoubleTab pvit_elem(0, N * dimension);
  if (nf_tot == vit.dimension_tot(0))
    {
      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)
      {
        const 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");
        const int e = f_e(f,c);
 
        double u_orth = 0 ;
        DoubleTrav u_parallel(D);
        if (nf_tot == vit.dimension_tot(0))
          {
            // ! n_f pointe vers la face 1 donc vers l'exterieur de l'element, d'ou le signe -
            for (int d = 0; d <D ; d++)
              u_orth -= pvit_elem(e, N*d+n)*n_f(f,d)/fs(f);
            for (int d = 0 ; d < D ; d++)
              u_parallel(d) = pvit_elem(e, N*d+n) - u_orth*(-n_f(f,d))/fs(f);
          }
        else
          {
            // ! n_f pointe vers la face 1 donc vers l'exterieur de l'element, d'ou le signe -
            for (int d = 0; d <D ; d++)
              u_orth -= vit(nf_tot + e * D+d, n)*n_f(f,d)/fs(f);
            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) ;
          }
 
        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");
        const double norm_u_parallel = std::sqrt(domaine.dot(&u_parallel(0), &u_parallel(0)));
 
        const double y_loc = (c == 0) ? domaine.dist_face_elem0(f, e) : domaine.dist_face_elem1(f, e);
        const double y_p_loc = calc_y_plus_loc(norm_u_parallel, nu_visc(e, n), y_loc, y_p(f, n), &d_bulles(e, 0), &alpha(e, 0));
 
        y_p(f, n) = std::max(y_p_min_, y_p_loc);
        u_t(f, n) = y_p(f, n)*nu_visc(e, n)/y_loc;
      }
}
 
double Loi_paroi_Ramstorfer::calc_y_plus_loc(double u_par, double nu, double y, double y_p_0, const double *d_bulles, const double *alpha)
{
  const double eps = eps_y_p_;
  const int iter_max = 20;
 
  int step = 1;
  double y_p = y_p_0 ;
  double u_tau = nu*y_p/y;
 
  do
    {
      y_p = y_p - (u_plus_de_y_plus(y_p, nu, y, d_bulles, alpha) - u_par/u_tau)/(deriv_u_plus_de_y_plus(y_p, nu, y, d_bulles, alpha) + 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, nu, y, d_bulles, alpha) - u_par/u_tau) > eps) and (step < iter_max));
 
  assert ( (std::fabs(u_par/u_tau - u_plus_de_y_plus(y_p, nu, y, d_bulles, alpha)) < eps_y_p_*10) and (step < iter_max));
 
  return y_p;
}
 
double Loi_paroi_Ramstorfer::u_plus_de_y_plus(double y_p, double nu, double y, const double *d_bulles, const double *alpha) // Ramstorfer model
{
  const Pb_Multiphase pbm = ref_cast(Pb_Multiphase, pb_.valeur());
 
  const double u_tau = y_p*y/nu;
  const double log_law = std::log(y_p + limiteur_y_p_)/von_karman_ + 5.1;
 
  double kr_p = 0;
  for (int i = 1 ; i < pbm.nb_phases() ; i++)
    kr_p += d_bulles[i]*alpha[i];
  kr_p *= u_tau/nu ;
 
  return log_law - (kr_p < 11.3 ? 0 : std::log(1 + C_kr_*kr_p)/von_karman_);
}
 
double Loi_paroi_Ramstorfer::deriv_u_plus_de_y_plus(double y_p, double nu, double y, const double *d_bulles, const double *alpha) // Ramstorfer model
{
  const Pb_Multiphase pbm = ref_cast(Pb_Multiphase, pb_.valeur());
 
  const double u_tau = y_p*y/nu;
  const double d_log_law = 1/((y_p+limiteur_y_p_)*von_karman_);
 
  double kr = 0;
  for (int i = 1 ; i < pbm.nb_phases() ; i++)
    kr += d_bulles[i]*alpha[i];
  const double kr_p = kr * u_tau/nu;
 
  return d_log_law - (kr_p < 11.3 ? 0 : (C_kr_*kr/y)/((1 + C_kr_*y_p*kr/y)/von_karman_));
}