virtual void eval(SpaceTimeData const &x_t, MediaData const &media_data, GasPressureData const &p_GR, CapillaryPressureData const &p_cap, TemperatureData const &T_data, PureLiquidDensityData const &rho_W_LR, FluidEnthalpyData &fluid_enthalpy_data, MassMoleFractionsData &mass_mole_fractions_data, FluidDensityData &fluid_density_data, VapourPartialPressureData &vapour_pressure_data, ConstituentDensityData &constituent_density_data, PhaseTransitionData &cv) const =0