Flux_2groupes_Smith.h

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#ifndef Flux_2groupes_Smith_included
#define Flux_2groupes_Smith_included
 
#include <Flux_2groupes_base.h>
#include <TRUSTTabs_forward.h>
#include <TRUSTTab.h>
 
/*! @brief Two-group interfacial area transport source terms using the Smith et al. model.
 *
 *         Computes coalescence (RC, WE) and breakup (TI, SO) source terms for
 *         the two-group interfacial area transport equation.
 *
 *         References:
 *         - T.R. Smith et al., "Mechanistic modeling of interfacial area transport
 *           in large diameter pipes", IJMF, 2012.
 *         - J.L. Bottini et al., "Validation of two-group interfacial area transport
 *           equation in boiling flow", IJHMT, 2024.
 */
class Flux_2groupes_Smith : public Flux_2groupes_base
{
  Declare_instanciable(Flux_2groupes_Smith);
public:
  /*! @brief Computes coalescence/breakup source terms and their derivatives. */
  void coeffs(const input_coeffs& input, output_coeffs& output) const override;
 
  /*! @brief Computes thermal source terms (condensation, phase change, wall nucleation). */
  void therm(const input_therms& input, output_therms& output) const override;
 
protected:
  static constexpr double fac_sec_ = 1.e4;         //!< Numerical security factor
  static constexpr double alpha_coal_max_ = 0.509;  //!< Maximum void fraction for coalescence
 
  const double g = 9.81;
  const double b = 0.597;
  const double p = 0.01;
  const double alpha_max = 0.62;
  const double C_RC1 = 0.005;
  const double C_RC0 = 3.0;
  const double C_RC122 = 0.005;
  const double C_WE1 = 0.002;
  const double C_TI21 = 0.02;
  const double C_S0 = 0.000038;
  const double We_SO = 4500.;
  const double We_cr1 = 6.5;
  const double We_cr2 = 7.0;
  double Xi_h_ = 0.;
  double A_c_ = 1.;
  double hPNVG_ = 0.;
  double betac = 0.4;
  double pc = 0.055;
  double R_ = 462.;
  double theta_rad = M_PI / 2.;
};
 
#endif