Large-Eddy Simulations of turbulent flows with lattice Boltzmann dynamics and dynamical system sub-grid models  

作　　者：GUAN Hui1 & WU ChuiJie2 1 Research Center for Fluid Dynamics, PLA University of Science and Technology, Nanjing 211101, China 2 School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China 

出　　处：《Science China(Technological Sciences)》2009年第3期670-679,共10页中国科学（技术科学英文版）

基　　金：Supported by the Key Project of National Natural Science Foundation of China (Grant No. 10532030)

摘　　要：In this paper, two sub-grid scale (SGS) models are introduced into the Lattice Boltzmann Method (LBM), i.e., the dynamics SGS model and the dynamical system SGS model, and applied to numerically solving three-dimensional high Re turbulent cavity flows. Results are compared with those obtained from the Smagorinsky model and direct numerical simulation for the same cases. It is shown that the method with LBM dynamics SGS model has advantages of fast computation speed, suitable to simulate high Re turbulent flows. In addition, it can capture detailed fine structures of turbulent flow fields. The method with LBM dynamical system SGS model dose not contain any adjustable parameters, and can be used in simulations of various complicated turbulent flows to obtain correct information of sub-grid flow field, such as the backscatter of energy transportation between large and small scales. A new average method of eliminating the inherent unphysical oscillation of LBM is also given in the paper.In this paper, two sub-grid scale (SGS) models are introduced into the Lattice Boltzmann Method (LBM), i.e., the dynamics SGS model and the dynamical system SGS model, and applied to numerically solving three-dimensional high Re turbulent cavity flows. Results are compared with those obtained from the Smagorinsky model and direct numerical simulation for the same cases. It is shown that the method with LBM dynamics SGS model has advantages of fast computation speed, suitable to simulate high Re turbulent flows. In addition, it can capture detailed fine structures of turbulent flow fields. The method with LBM dynamical system SGS model dose not contain any adjustable parameters, and can be used in simulations of various complicated turbulent flows to obtain correct information of sub-grid flow field, such as the backscatter of energy transportation between large and small scales. A new average method of eliminating the inherent unphysical oscillation of LBM is also given in the paper.

关 键 词：Large-Eddy Simulation Lattice BOLTZMANN Method DYNAMICS sub-grid SCALE MODEL dynamical system sub-grid SCALE MODEL parallel computation 

分 类 号：TB126[理学—工程力学]