Towards Simple Implicit Preconditioning Riemann Solvers for the Simulation of the Low Mach number Flows

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题名:	Towards Simple Implicit Preconditioning Riemann Solvers for the Simulation of the Low Mach number Flows
作者:	Niu, Yang-Yao;Yang, Ming Jung
关键词:	Multiphase Flow;Riemann Solver;AUSM;Low Mach number Flows
日期:	2015-10-22
上传时间:	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
显示于类别:	[航空太空工程學系暨研究所] 會議論文

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