Numerical method for simulating rarefaction shocks in the approximation of phase-flip hydrodynamics  

作　　者：M.M.BASKO 

机构地区：[1]Keldysh Institute of Applied Mathematics,Russian Academy of Sciences,Miusskaya Square 4,Moscow 125047,Russia

出　　处：《Applied Mathematics and Mechanics(English Edition)》2021年第6期871-884,共14页应用数学和力学（英文版）

摘　　要：A finite-difference algorithm is proposed for numerical modeling of hydrodynamic flows with rarefaction shocks, in which the fluid undergoes a jump-like liquid-gas phase transition. This new type of flow discontinuity, unexplored so far in computational fluid dynamics, arises in the approximation of phase-flip(PF) hydrodynamics, where a highly dynamic fluid is allowed to reach the innermost limit of metastability at the spinodal, upon which an instantaneous relaxation to the full phase equilibrium(EQ) is assumed. A new element in the proposed method is artificial kinetics of the phase transition, represented by an artificial relaxation term in the energy equation for a "hidden"component of the internal energy, temporarily withdrawn from the fluid at the moment of the PF transition. When combined with an appropriate variant of artificial viscosity in the Lagrangian framework, the latter ensures convergence to exact discontinuous solutions, which is demonstrated with several test cases.

关 键 词：fluid dynamics with phase transitions two-phase flow rarefaction shock Lagrangian scheme artificial viscosity artificial kinetics 

分 类 号：O362[理学—流体力学]