EDO_Pression_th_VEF_Gaz_Reel.cpp

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#include <EDO_Pression_th_VEF_Gaz_Reel.h>
#include <Fluide_Quasi_Compressible.h>
#include <Neumann_sortie_libre.h>
#include <Navier_Stokes_std.h>
#include <Schema_Temps_base.h>
#include <Domaine_Cl_VEF.h>
#include <Domaine_VEF.h>
#include <TRUSTTrav.h>
 
Implemente_instanciable(EDO_Pression_th_VEF_Gaz_Reel, "EDO_Pression_th_VEF_Gaz_Reel_non", EDO_Pression_th_VEF);
 
Sortie& EDO_Pression_th_VEF_Gaz_Reel::printOn(Sortie& os) const { return os << que_suis_je() << finl; }
 
Entree& EDO_Pression_th_VEF_Gaz_Reel::readOn(Entree& is) { return is; }
 
/*! @brief Solves the ODE.
 *
 * @param (double Pth_n) The pressure at the previous time step
 * @return (double) The new pressure value
 */
double EDO_Pression_th_VEF_Gaz_Reel::resoudre(double Pth_n)
{
  int n_bord;
  for (n_bord = 0; n_bord < le_dom->nb_front_Cl(); n_bord++)
    {
      const Cond_lim& la_cl = le_dom_Cl->les_conditions_limites(n_bord);
      if (sub_type(Neumann_sortie_libre, la_cl.valeur()))
        return Pth_n;
    }
  double Pth;
  const DoubleTab& tab_vit = ref_cast(Navier_Stokes_std,le_fluide_->vitesse().equation()).vitesse().valeurs();
  const DoubleTab& tab_hnp1 = le_fluide_->inco_chaleur().valeurs();       //current
  const DoubleTab& tab_hn = le_fluide_->inco_chaleur().passe();        //previous
  const DoubleTab& tab_rho = le_fluide_->masse_volumique().valeurs();    //current
  const OWN_PTR(Loi_Etat_base)& loi_ = le_fluide_->loi_etat();
  //  const DoubleVect& tab_rhon = loi_->rho_n();                       //passe
 
  int elem, nb_elem = le_dom->nb_elem();
  double V = 0; // domain measure
  double Fn = 0; // integral 1 at time step n
  double Fnp1 = 0; // integral 1 at time step n+1
  double S = 0; // right-hand side
 
  double dt = le_fluide_->vitesse().equation().schema_temps().pas_de_temps();
  double v, al, bn, bnp1, hn, hnp1, divu;
 
  int i, face, nb_faces = le_dom->nb_faces();
  // compute T* at elements
  DoubleTab HstarP0(nb_elem);
  DoubleTab gradh(nb_faces, dimension);
  DoubleTab u_gradh(nb_faces);
  int nfe = le_dom->domaine().nb_faces_elem();
  const IntTab& elem_faces = le_dom->elem_faces();
  for (elem = 0; elem < nb_elem; elem++)
    {
      HstarP0(elem) = 0;
      for (face = 0; face < nfe; face++)
        {
          hn = tab_hn(elem_faces(elem, face));
          hnp1 = tab_hnp1(elem_faces(elem, face));
          HstarP0(elem) += .5 * (hn + hnp1);
        }
      HstarP0(elem) /= nfe;
    }
  // compute gradT*
  calculer_grad(HstarP0, gradh);
  // compute u.gradT*
  for (face = 0; face < nb_faces; face++)
    {
      u_gradh(face) = 0;
      for (i = 0; i < dimension; i++)
        {
          u_gradh(face) += gradh(face, i) * tab_vit(face, i);
        }
    }
  // compute divU in P0 and P1
  DoubleTrav divUP0(nb_elem);
  ref_cast(Navier_Stokes_std,le_fluide_->vitesse().equation()).operateur_divergence().calculer(tab_vit, divUP0);
  DoubleTrav divU(nb_faces);
  int e0, e1;
  for (face = 0; face < nb_faces; face++)
    {
      e0 = le_dom->face_voisins(face, 0);
      e1 = le_dom->face_voisins(face, 1);
      if (e0 != -1 && e1 != -1)
        {
          divU(face) = .5 * (divUP0(e0) + divUP0(e1));
        }
      else if (e0 != -1)
        {
          divU(face) = divUP0(e0);
        }
      else
        {
          divU(face) = divUP0(e1);
        }
    }
 
  for (face = 0; face < nb_faces; face++)
    {
      v = le_dom->volumes_entrelaces(face);
      V += v;
      hn = tab_hn(face);
      hnp1 = tab_hnp1(face);
      al = loi_->Drho_DT(Pth_n, hn) / loi_->Drho_DP(Pth_n, hn);
      bn = tab_rho(face) / loi_->Drho_DP(Pth_n, hn);
      bnp1 = loi_->calculer_masse_volumique(Pth_n, hnp1) / loi_->Drho_DP(Pth_n, hnp1);
      divu = divU(face);
 
      S -= v * al * ((hnp1 - hn) / dt + u_gradh(face));
      Fn += v * bn * divu;
      Fnp1 += v * bnp1 * divu;
    }
 
  Pth = Pth_n + dt / V * (S - Fn);
  Pth = Pth_n + dt / V * (S - .5 * (Fn + Fnp1));
  double tmp = 0, r;
  int k = 0;
  while (std::fabs(tmp - Pth) / Pth > 1e-9 && k++ < 20)
    {
      tmp = Pth;
      Fnp1 = 0;
      for (face = 0; face < nb_faces; face++)
        {
          v = le_dom->volumes_entrelaces(face);
          hnp1 = tab_hnp1(face);
          r = loi_->calculer_masse_volumique(Pth, hnp1);
          bnp1 = r / loi_->Drho_DP(Pth, hnp1);
          Fnp1 += v * bnp1 * divU(face);
        }
      Pth = Pth_n + dt / V * (S - .5 * (Fn + Fnp1));
      Cerr << "Thermodynamic pressure recomputed (impl" << k << ") = " << Pth << finl;
    }
  return Pth;
}