Frottement_interfacial_Tomiyama_complet.h

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#ifndef Frottement_interfacial_Tomiyama_complet_included
#define Frottement_interfacial_Tomiyama_complet_included
#include <Frottement_interfacial_base.h>
#include <utility>
 
/*! @brief Interfacial friction coefficients for bubbly flows using the Tomiyama correlation.
 *
 *         Computes drag coefficient Cd based on contamination level:
 *         - 0: pure system (Stokes coefficient 16, cap coefficient 48)
 *         - 1: moderate contamination (Stokes coefficient 24, cap coefficient 72)
 *         - 2: fully contaminated (Stokes coefficient 24, no cap limit)
 *
 *         Reference: NeptuneCFD implementation.
 */
class Frottement_interfacial_Tomiyama_complet : public Frottement_interfacial_base
{
  Declare_instanciable(Frottement_interfacial_Tomiyama_complet);
public:
  /*! @brief Computes friction coefficients and their derivatives with respect to relative velocity. */
  void coefficient(const DoubleTab& alpha, const DoubleTab& p, const DoubleTab& T,
                   const DoubleTab& rho, const DoubleTab& mu, const DoubleTab& sigma, double Dh,
                   const DoubleTab& ndv, const DoubleTab& d_bulles, DoubleTab& coeff) const override;
 
  /*! @brief Computes drag coefficients Cd only (no derivatives). */
  void coefficient_CD(const DoubleTab& alpha, const DoubleTab& p, const DoubleTab& T,
                      const DoubleTab& rho, const DoubleTab& mu, const DoubleTab& sigma, double Dh,
                      const DoubleTab& ndv, const DoubleTab& d_bulles, DoubleTab& coeff) const override;
 
  void completer() override;
 
protected:
  double g_ = 9.81;
  double beta_ = 1.;
  int contamination_ = 0; //!< Contamination level: 0=pure, 1=moderate, 2=fully contaminated
  int n_l = -1; //!< Index of the liquid phase
 
private:
  /*! @brief Computes the drag coefficient Cd and its derivative w.r.t. relative velocity norm.
   *
   * @param Re Reynolds number
   * @param dndv_Re Derivative of Re w.r.t. relative velocity norm
   * @param Eo Eotvos number
   * @param alpha_k Volume fraction of dispersed phase k
   * @return Pair {Cd, dndv_Cd}
   */
  std::pair<double, double> compute_Cd(double Re, double dndv_Re, double Eo, double alpha_k) const;
};
 
#endif