Meyapin, Y.; Dutykh, D.; Gisclon, M. Velocity and energy relaxation in two-phase flows. (English) Zbl 1379.76028 Stud. Appl. Math. 125, No. 2, 179-212 (2010). Summary: We investigate analytically the process of velocity and energy relaxation in two-phase flows. We begin our exposition by considering the so-called six equations two-phase model [M. Ishii, Thermo-fluid dynamic theory of two-phase flow. Paris: Eyrolles (1975; Zbl 0325.76135), J.-M. Rovarch, Ph. D. Thesis, École Normale Supérieure de Cachan (2006)]. This model assumes each phase to possess its own velocity and energy variables. Despite recent advances, the six equations model remains computationally expensive for many practical applications. Moreover, its advection operator may be nonhyperbolic, which poses additional theoretical difficulties to construct robust numerical schemes [J.-M. Ghidaglia, Eur. J. Mech., B, Fluids 20, No. 6, 841–867 (2001; Zbl 1059.76041)]. To simplify this system, we complete momentum and energy conservation equations by relaxation terms. When relaxation characteristic time tends to zero, velocities and energies are constrained to tend to common values for both phases. As a result, we obtain a simple two-phase model that was recently proposed for simulation of violent aerated flows [F. Dias et al., Comput. Fluids 39, No. 2, 283–293 (2010; Zbl 1242.76329)]. The preservation of invariant regions and incompressible limit of the simplified model are also discussed. Finally, several numerical results are presented. Cited in 1 Document MSC: 76T10 Liquid-gas two-phase flows, bubbly flows 76M25 Other numerical methods (fluid mechanics) (MSC2010) 76N15 Gas dynamics (general theory) Citations:Zbl 0325.76135; Zbl 1059.76041; Zbl 1242.76329 Software:RELAP5; NEPTUNE; THYC; CATHARE PDF BibTeX XML Cite \textit{Y. Meyapin} et al., Stud. Appl. 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