Paroi_Knudsen_non_negligeable.cpp

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#include <Paroi_Knudsen_non_negligeable.h>
#include <Champ_front_fonc_gradient.h>
#include <Discretisation_base.h>
 
Implemente_instanciable(Paroi_Knudsen_non_negligeable, "Paroi_Knudsen_non_negligeable", Dirichlet_paroi_defilante);
// XD paroi_knudsen_non_negligeable dirichlet paroi_knudsen_non_negligeable INHERITS_BRACE Boundary condition for number
// XD_CONT of Knudsen (Kn) above 0.001 where slip-flow condition appears: the velocity near the wall depends on the
// XD_CONT shear stress : Kn=l/L with l is the mean-free-path of the molecules and L a characteristic length scale. NL2
// XD_CONT U(y=0)-Uwall=k(dU/dY) NL2 Where k is a coefficient given by several laws: NL2 Mawxell : k=(2-s)*l/s NL2
// XD_CONT Bestok\&Karniadakis :k=(2-s)/s*L*Kn/(1+Kn) NL2 Xue\&Fan :k=(2-s)/s*L*tanh(Kn) NL2 s is a value between 0 and
// XD_CONT 2 named accomodation coefficient. s=1 seems a good value. NL2 Warning : The keyword is available for VDF
// XD_CONT calculation only for the moment.
// XD attr name_champ_1 chaine(into=["vitesse_paroi","k"]) name_champ_1 REQ Field name.
// XD attr champ_1 front_field_base champ_1 REQ Boundary field type.
// XD attr name_champ_2 chaine(into=["vitesse_paroi","k"]) name_champ_2 REQ Field name.
// XD attr champ_2 front_field_base champ_2 REQ Boundary field type.
 
 
Sortie& Paroi_Knudsen_non_negligeable::printOn(Sortie& s) const { return s << que_suis_je() << finl; }
 
Entree& Paroi_Knudsen_non_negligeable::readOn(Entree& s)
{
  if (app_domains.size() == 0) app_domains = { Motcle("Hydraulique"), Motcle("indetermine") };
 
  Cerr << "Paroi_Knudsen_non_negligeable::readOn" << finl;
  Motcle mot;
  Motcles les_motcles(3);
  {
    les_motcles[0] = "vitesse_paroi";
    les_motcles[1] = "k";
  }
  int nb_champs_lus = 0;
  while (nb_champs_lus < 2)
    {
      s >> mot;
      int rang = les_motcles.search(mot);
      if (rang == 0)
        s >> vitesse_paroi_;
      if (rang == 1)
        s >> k_;
      nb_champs_lus++;
    }
 
  le_champ_front.typer("Champ_front_fonc_gradient");
  le_champ_front->fixer_nb_comp(dimension);
  return s;
}
 
void Paroi_Knudsen_non_negligeable::completer()
{
  Cerr << "Paroi_Knudsen_non_negligeable::completer" << finl;
  Nom type = "Champ_front_fonc_gradient_";
  type += domaine_Cl_dis().equation().discretisation().que_suis_je();
  // Final type based on the discretization
  Frontiere_dis_base& fr = le_champ_front->frontiere_dis();
  le_champ_front.typer(type);
  le_champ_front->associer_fr_dis_base(fr);
  // Sliding wall: le_champ_front is the velocity with
  // as many components as the problem dimension... Is it useful to size
  // it now?
  le_champ_front->fixer_nb_comp(dimension);
  // Associate the unknown:
  Champ_front_fonc_gradient& ch = ref_cast(Champ_front_fonc_gradient, le_champ_front.valeur());
  ch.associer_ch_inc_base(domaine_Cl_dis().equation().inconnue());
  Cerr << "Paroi_Knudsen_non_negligeable::completer OK" << finl;
}