期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 42, 期 -, 页码 10-22出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2013.03.013
关键词
Lattice Boltzmann method; Filter matrix; Large eddy simulation; Turbulent natural convection
资金
- Doctorate Foundation of Northwestern Polytechnical University [CX201209]
- Aeronautical Science Fund of China [20111453012]
- National Pre-Research Foundation of China [9140A13040111HK0329]
- Supercomputing Center of the University of Science and Technology of China
In this paper, a novel thermal filter-matrix lattice Boltzmann model based on large eddy simulation (LES) is proposed for simulating turbulent natural convection. In this study, the Vreman subgrid-scale eddy-viscosity model is introduced into the present framework of LES to accurately predict the flow in near-wall region. Two dimensional numerical simulations of natural convection in a square cavity were performed at high Rayleigh number varying from 10(7) to 10(10) with a fixed Prandtl number of Pr = 0.71. The influences of the higher-order terms upon the present results at high Rayleigh numbers are examined, taking Ra = 10(7) and 10(8) as the example, revealing that the proper minimization of the higher-order terms can improve numerical accuracy of present model for high Rayleigh convective flow. For the turbulent convective flow, the time-averaged quantities in the median lines are presented and compared against those available results from previous studies. The general structure of turbulent boundary layers is well predicted. All numerical results exhibit good agreement with the benchmark solutions available in the previous literatures. (c) 2013 Elsevier Inc. All rights reserved.
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