A Consistent Characteristic Boundary Condition for General Fluid Mixture and Its Implementation in a Preconditioning Scheme  

作　　者：Hua-Guang Li Nan Zong Xi-Yun Lu Vigor Yang 

机构地区：[1]Department of Modern Mechanics,The University of Science and Technology of China,Hefei,Anhui 230026,China [2]Department of Mechanical and Nuclear Engineering,The Pennsylvania State University,University Park,PA 16802,USA [3]School of Aerospace Engineering,The Georgia Institute of Technology,Atlanta,GA 30332,USA

出　　处：《Advances in Applied Mathematics and Mechanics》2012年第1期72-92,共21页应用数学与力学进展（英文）

基　　金：This work was supported in part by the National Natural Science Foundation of China(Nos.11132010 and 11072236).

摘　　要：Characteristic boundary conditions that are capable of handling general fluid mixtures flow at all flow speeds are developed.The formulation is based on fundamental thermodynamics theories incorporated into an efficient preconditioning scheme in a unified manner.Local one-dimensional inviscid(LODI)relations compatible to the preconditioning system are proposed to obtain information carried by incoming characteristic waves at boundaries accurately.The approach has been validated against a variety of sample problems at a broad range of fluid states and flow speeds.Both acoustic waves and hydrodynamic flow features can pass through the boundaries of computational domain transparently without any unphysical reflection or spurious distortion.The approach can be reliably applied to fluid flows at extensive thermodynamic states and flow speeds in numerical simulations.Moreover,the use of the boundary condition shows to improve the computational efficiency.

关 键 词：Real-fluid preconditioning method method of characteristics LODI relations 

分 类 号：O35[理学—流体力学]