Op_Dift_VDF_Face_base.cpp

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#include <Op_Dift_VDF_Face_base.h>
 
Implemente_base(Op_Dift_VDF_Face_base,"Op_Dift_VDF_Face_base",Op_Dift_VDF_base);
 
Sortie& Op_Dift_VDF_Face_base::printOn(Sortie& s ) const { return s << que_suis_je() ; }
Entree& Op_Dift_VDF_Face_base::readOn(Entree& s ) { return s ; }
 
double Op_Dift_VDF_Face_base::calculer_dt_stab() const
{
  const Domaine_VDF& domaine_VDF = iter_->domaine();
  return calculer_dt_stab(domaine_VDF);
}
 
/*
 * Calcul du pas de temps de stabilite : Pour const/var Face
 * La diffusivite laminaire est constante ou variable, La diffusivite turbulente est variable
 *    dt_stab = Min (1/(2*(diff_lam(i)+diff_turb(i))*coeff(elem))
 *
 *  avec coeff =  1/(dx*dx) + 1/(dy*dy) + 1/(dz*dz) et i decrivant l'ensemble des elements du maillage
 *  Rq: en hydraulique on cherche le Max sur les elements du maillage initial (comme en thermique) et non le Max sur les volumes de Qdm.
 */
double Op_Dift_VDF_Face_base::calculer_dt_stab(const Domaine_VDF& domaine_VDF) const
{
  double dt_stab, coef = -1.e10;
  const DoubleTab& diffu = diffusivite().valeurs(), &diffu_turb = diffusivite_turbulente().valeurs();
 
  // B.Mat. 9/3/2005: to handle single-phase/qc/front-tracking generically. Update qc and the old ft to use this mechanism
  const int nb_elem = domaine_VDF.nb_elem(), dim = Objet_U::dimension;
  if (has_champ_masse_volumique())
    {
      const DoubleTab& valeurs_rho = get_champ_masse_volumique().valeurs();
      for (int elem = 0; elem < nb_elem; elem++)
        {
          double diflo = 0.;
          for (int i = 0; i < dim; i++)
            {
              const double h = domaine_VDF.dim_elem(elem, i);
              diflo += 1. / (h * h);
            }
          double mu_physique = diffu(elem, 0),  mu_turbulent = diffu_turb(elem, 0);
 
          for (int ncomp = 1; ncomp < diffu.line_size(); ncomp++) mu_physique = std::max(mu_physique, diffu(elem, ncomp));
          for (int ncomp = 1; ncomp < diffu_turb.line_size(); ncomp++) mu_turbulent = std::max(mu_turbulent, diffu_turb(elem, ncomp));
 
          const double inv_rho = 1./valeurs_rho(elem) ;
          diflo *= (mu_physique + mu_turbulent) * inv_rho;
          coef = std::max(coef, diflo);
        }
    }
  else
    {
      const Champ_base& champ_diffu = diffusivite_pour_pas_de_temps();
      const DoubleTab& diffu_dt = champ_diffu.valeurs();
      const int diffu_dt_variable = (diffu_dt.dimension(0) == 1) ? 0 : 1, diffu_variable = (diffu.dimension(0) == 1) ? 0 : 1;
      for (int elem = 0; elem < nb_elem; elem++)
        {
          double diflo = 0.;
          for (int i = 0; i < dim; i++)
            {
              const double h = domaine_VDF.dim_elem(elem, i);
              diflo += 1. / (h * h);
            }
 
          int item = (diffu_variable ? elem : 0);
          double mu_physique = diffu(item, 0), mu_turbulent = diffu_turb(elem, 0);
 
          for (int ncomp = 1; ncomp < diffu.line_size(); ncomp++) mu_physique = std::max(mu_physique, diffu(item, ncomp));
          for (int ncomp = 1; ncomp < diffu_turb.line_size(); ncomp++) mu_turbulent = std::max(mu_turbulent, diffu_turb(elem, ncomp));
 
          item = (diffu_dt_variable ? elem : 0);
          double diffu_dt_l = diffu_dt(item, 0);
 
          for (int ncomp = 1; ncomp < diffu_dt.line_size(); ncomp++) diffu_dt_l = std::max(diffu_dt_l, diffu_dt(item, ncomp));
 
          // if mu was associated instead of nu, we have nu without diffu_dt
          // the stability time step is nu+nu_t; compute (mu+mu_t)*(nu/mu)=(mu+mu_t)/rho=nu+nu_t (advantage over dividing by rho: also works for alpha and lambda and in VEF)
          diflo *= (mu_physique + mu_turbulent)*(diffu_dt_l)/mu_physique ;
          coef = std::max(coef, diflo);
        }
    }
  coef = Process::mp_max(coef);
  dt_stab = 0.5 / (coef+DMINFLOAT);
 
  return dt_stab;
}
 
void Op_Dift_VDF_Face_base::calculer_borne_locale(DoubleVect& borne_visco_turb,double dt,double dt_diff_sur_dt_conv) const
{
  const Domaine_VDF& domaine_VDF = iter_->domaine();
  const Champ_base& champ_diffu = diffusivite();
  const DoubleVect& diffu = champ_diffu.valeurs();
  const int diffu_variable = (diffu.size() == 1) ? 0 : 1, nb_elem = domaine_VDF.nb_elem();
  const double diffu_constante = (diffu_variable ? 0. : diffu(0));
  for (int elem=0; elem<nb_elem; elem++)
    {
      double h_inv = 0;
      for (int dir = 0; dir < dimension; dir++)
        {
          double h = domaine_VDF.dim_elem(elem,dir);
          h_inv += 1/(h*h);
        }
      double diffu_l = diffu_variable ? diffu(elem) : diffu_constante;
      double coef = 1/(2*(dt+DMINFLOAT)*h_inv*dt_diff_sur_dt_conv) - diffu_l;
 
      if (coef>0 && coef<borne_visco_turb(elem)) borne_visco_turb(elem) = coef;
    }
}
 
void Op_Dift_VDF_Face_base::dimensionner_blocs(matrices_t matrices, const tabs_t& semi_impl) const
{
  const std::string& nom_inco = equation().inconnue().le_nom().getString();
  if (!matrices.count(nom_inco) || semi_impl.count(nom_inco)) return; //semi-implicit or no diagonal block -> nothing to do
 
  Matrice_Morse *mat = matrices.count(nom_inco) ? matrices.at(nom_inco) : nullptr, mat2;
  Op_VDF_Face::dimensionner(iter_->domaine(), iter_->domaine_Cl(), mat2);
  mat->nb_colonnes() ? *mat += mat2 : *mat = mat2;
}