T_paroi_Champ_P0_VDF.h

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#ifndef T_paroi_Champ_P0_VDF_included
#define T_paroi_Champ_P0_VDF_included
 
#include <Echange_externe_radiatif.h>
#include <Champ_Fonc_P0_VDF.h>
#include <Domaine_Cl_VDF.h>
#include <TRUST_Ref.h>
 
class Champ_P0_VDF;
 
class T_paroi_Champ_P0_VDF: public Champ_Fonc_P0_VDF
{
  Declare_instanciable(T_paroi_Champ_P0_VDF);
public:
  void mettre_a_jour(double) override;
  void associer_champ(const Champ_P0_VDF&);
  const Domaine_Cl_dis_base& domaine_Cl_dis_base() const { return le_dom_Cl_VDF.valeur(); }
 
  inline const Champ_P0_VDF& mon_champ() const { return mon_champ_.valeur(); }
 
  inline void associer_domaine_Cl_dis_base(const Domaine_Cl_dis_base& le_dom_Cl_dis_base)
  {
    le_dom_Cl_VDF = ref_cast(Domaine_Cl_VDF, le_dom_Cl_dis_base);
  }
 
protected:
  void me_calculer(double);
  OBS_PTR(Champ_P0_VDF) mon_champ_;
  OBS_PTR(Domaine_Cl_VDF) le_dom_Cl_VDF;
};
 
inline double newton_T_paroi_VDF(double eps, double h, double T_ext, double lambda, double e, double T0)
{
  double Tb = T0;
  const double it_max = 100, tolerance = 1e-8;
  for (int i = 0; i < it_max; i++)
    {
      const double f = COEFF_STEFAN_BOLTZMANN * eps * (T_ext * T_ext * T_ext * T_ext - Tb * Tb * Tb * Tb) + h * (T_ext - Tb) - lambda / e * (Tb - T0);
      const double f_p = -4 * COEFF_STEFAN_BOLTZMANN * eps * Tb * Tb * Tb - h - lambda / e;
      const double Tb_new = Tb - f / f_p;
      if (std::abs(Tb_new - Tb) < tolerance)
        return Tb_new;
      Tb = Tb_new;
    }
  Process::exit("newton_T_paroi_VDF : newton did not converge !");
  return Tb;
}
 
#endif /* T_paroi_Champ_P0_VDF_included */