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    題名: Towards Simple Implicit Preconditioning Riemann Solvers for the Simulation of the Low Mach number Flows
    作者: Niu, Yang-Yao;Yang, Ming Jung
    關鍵詞: Multiphase Flow;Riemann Solver;AUSM;Low Mach number Flows
    日期: 2015-10-22
    上傳時間: 2016-04-27 11:26:19 (UTC+8)
    出版者: 台灣計算力學學會
    摘要: Here, an unsteady matrix-free implicit preconditioning formulation for multi-phase flows with arbitrary
    equation of state based on the AUSMD type Riemann solvers are developed for multi-phase flows at allspeed.
    The numerical stability problem caused by the multi-scale speed of sound due to uncertain dissipation
    terms in the current schemes that can be resolved by rescaling the eigenvalues of the Euler type system
    equations to enhance computational convergence and keep accuracy. This paper considers a homogeneous
    two-phase mixture model with the assumption of kinematics and thermodynamics equilibriums. The
    thermodynamics behaviors of liquid phase, vapor phase and their phase transitional process are described by
    a temperature dependent hybrid equation of state which includes a mass-fraction averaged formula of watervapor
    saturation process. The proposed numerical fluxes are validated against several benchmark tests and
    and enables general equations of state to be handled for complicated multiphase flow simulations.
    關聯: 1st Association of Computational Mechanics Taiwan (ACMT) Conference
    顯示於類別:[航空太空工程學系暨研究所] 會議論文


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