Op_Diff_EF_base.cpp

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#include <Op_Diff_EF_base.h>
#include <Champ_Uniforme.h>
#include <Milieu_base.h>
#include <Probleme_base.h>
#include <Schema_Temps_base.h>
#include <Domaine_EF.h>
#include <Domaine_Cl_EF.h>
#include <Champ_Fonc_P0_base.h>
#include <Domaine.h>
 
Implemente_base_sans_constructeur(Op_Diff_EF_base,"Op_Diff_EF_base",Operateur_Diff_base);
 
Op_Diff_EF_base::Op_Diff_EF_base()
{
  declare_support_masse_volumique(1);
}
 
//// printOn
//
 
Sortie& Op_Diff_EF_base::printOn(Sortie& s ) const
{
  return s << que_suis_je() ;
}
 
 
//// readOn
//
 
Entree& Op_Diff_EF_base::readOn(Entree& s )
{
  return s ;
}
 
int Op_Diff_EF_base::impr(Sortie& os) const
{
  return Op_EF_base::impr(os, *this);
}
 
void Op_Diff_EF_base::associer(const Domaine_dis_base& domaine_dis,
                               const Domaine_Cl_dis_base& domaine_cl_dis,
                               const Champ_Inc_base& ch_transporte)
{
 
  const Domaine_EF& zEF = ref_cast(Domaine_EF,domaine_dis);
  const Domaine_Cl_EF& zclEF = ref_cast(Domaine_Cl_EF,domaine_cl_dis);
 
  le_dom_EF = zEF;
  la_zcl_EF = zclEF;
  inconnue = ch_transporte;
 
  const Domaine_EF& domaine_EF = le_dom_EF.valeur();
 
  int nb_comp = 1;
 
  flux_bords_.resize(domaine_EF.nb_faces_bord(),nb_comp);
  flux_bords_=0.;
}
double Op_Diff_EF_base::calculer_dt_stab() const
{
  remplir_nu(nu_);
  // The diffusivity is constant over the domain, so
  //
  //          dt_diff = h*h/diffusivity
 
  double dt_stab = DMAXFLOAT;
  const Domaine_EF& domaine_EF = le_dom_EF.valeur();
  if (! has_champ_masse_volumique())
    {
      if (1)
        {
          // "Standard" method for computing the time step.
          // This estimate is very conservative: if the max of the diffusivity
          // is not reached where the min of delta_h_squared is reached,
          // the time step is underestimated.
          const Champ_base& champ_diffusivite = diffusivite_pour_pas_de_temps();
          const DoubleVect&      valeurs_diffusivite = champ_diffusivite.valeurs();
          double alpha_max = local_max_vect(valeurs_diffusivite);
 
          if ((alpha_max == 0.)||(domaine_EF.nb_elem()==0))
            dt_stab = DMAXFLOAT;
          else
            {
              const double min_delta_h_carre = domaine_EF.carre_pas_du_maillage();
              dt_stab = min_delta_h_carre / (2. * dimension * alpha_max);
            }
        }
      else
        {
          const Domaine_EF& domaine_ef=ref_cast(Domaine_EF,equation().domaine_dis());
          const DoubleTab& coord=domaine_ef.domaine().les_sommets();
          const IntTab& elems=domaine_ef.domaine().les_elems() ;
          const Champ_base& champ_diffusivite = diffusivite_pour_pas_de_temps();
          const DoubleVect&      valeurs_diffusivite = champ_diffusivite.valeurs();
          const int nb_elem = domaine_EF.nb_elem();
          int elem;
          // Variable density field.
          for (elem = 0; elem < nb_elem; elem++)
            {
 
              const double diffu   = valeurs_diffusivite(elem)+DMINFLOAT;
              double dx2=0,dl;
              for (int d=0; d<3; d++)
                {
                  dl=coord(elems(elem,0),d)-coord(elems(elem,7),d);
                  dx2+=(dl*dl);
                }
              const double dt      = dx2 /  diffu;
              if (dt_stab > dt)
                {
                  dt_stab = dt;
                  // Cerr<<" ii "<<elem<<" "<<diffu<<" "<<dx2<<finl;
                }
            }
        }
    }
  else
    {
      const double           deux_dim      = 2. * Objet_U::dimension;
      const Champ_base& champ_diffu   = diffusivite();
      const DoubleTab&       valeurs_diffu = champ_diffu.valeurs();
      const Champ_base&      champ_rho     = get_champ_masse_volumique();
      const DoubleTab&       valeurs_rho   = champ_rho.valeurs();
      assert(sub_type(Champ_Fonc_P0_base, champ_rho));
      assert(sub_type(Champ_Fonc_P0_base, champ_diffu));
      const int nb_elem = domaine_EF.nb_elem();
      int elem;
      // Variable density field.
      for (elem = 0; elem < nb_elem; elem++)
        {
          const double h_carre = domaine_EF.carre_pas_maille(elem);
          const double diffu   = valeurs_diffu(elem);
          const double rho     = valeurs_rho(elem);
          const double dt      = h_carre * rho / (deux_dim * diffu);
          if (dt_stab > dt)
            dt_stab = dt;
        }
    }
  dt_stab = Process::mp_min(dt_stab);
  return dt_stab;
}