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Indexed by:期刊论文

Date of Publication:2009-03-01

Journal:SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES

Included Journals:SCIE、EI

Volume:52

Issue:3

Page Number:670-679

ISSN No.:1006-9321

Key Words:Large-Eddy Simulation; Lattice Boltzmann Method; dynamics sub-grid scale model; dynamical system sub-grid scale model; parallel computation

Abstract: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.