Neumann_sortie_libre.h

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#ifndef Neumann_sortie_libre_included
#define Neumann_sortie_libre_included
 
#include <Neumann_val_ext.h>
 
/*! @brief classe  Neumann_sortie_libre Cette classe represente une frontiere ouverte sans vitesse imposee
 *
 *     Pour les equations de Navier_Stokes on impose necessairement la pression sur une telle frontiere
 *     Pour traiter l'hydraulique, on derive donc de la classe Neumann_sortie_libre la classe Sortie_libre_pression_imposee
 *     Les conditions aux limites de type Neumann_sortie_libre ou des types derives se traduisent par des flux diffusifs nuls.
 *     En revanche, le traitement des flux convectifs impose de connaitre le champ convecte a l'exterieur de la frontiere en cas de re-entree
 *     de fluide. C'est pourquoi la classe porte un OWN_PTR(Champ_front_base) (membre le_champ_ext).
 *
 *     Dans les operateurs de calcul, les conditions aux limites de type Neumann_sortie_libre et des types derives seront traites de maniere identique
 *
 * @sa Neumann Sortie_libre_pression_imposee
 */
class Neumann_sortie_libre: public Neumann_val_ext
{
  Declare_instanciable(Neumann_sortie_libre);
public:
  const DoubleTab& tab_ext() const override;
  DoubleTab& tab_ext() override;
 
  double val_ext(int i) const override;
  double val_ext(int i, int j) const override;
  const DoubleTab& val_ext() const;
  int initialiser(double temps) override;
  void associer_fr_dis_base(const Frontiere_dis_base&) override;
  void verifie_ch_init_nb_comp() const override;
 
  void fixer_nb_valeurs_temporelles(int nb_cases) override;
  void mettre_a_jour(double temps) override;
  void set_temps_defaut(double temps) override;
  void changer_temps_futur(double temps, int i) override;
  int avancer(double temps) override;
  int reculer(double temps) override;
 
protected:
  OWN_PTR(Champ_front_base) le_champ_ext;
  mutable DoubleTab val_ext_; // Stocke toutes les valeurs de la CL sur toutes les faces de la frontiere (pas d'hypothese sur un champ uniforme). Utile pour le GPU.
};
 
#endif