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	Large Eddy Simulation of a dilute particle-laden turbulent flow over a backward-facing step
	Hui Qiang Zhang ; Bing Wang ; Cheong Ki Chan ; Xi Lin Wang
	2010-10-12 ; 2010-10-12
关键词	Theoretical or Mathematical/ flow separation flow simulation multiphase flow turbulence vortices/ large Eddy simulation dilute gas-particle turbulent flows backward-facing step Lagrangian particle trajectory method flow separation flow reattachments coherent structure vortex particle dispersions particle number density/ A4725 Turbulent flows, convection, and heat transfer A4755K Multiphase flows A4710 General fluid dynamics theory, simulation and other computational methods
中文摘要	Dilute gas-particle turbulent flows over a backward-facing step are numerically simulated by Large Eddy Simulation (LES) for the continuous phase and Lagrangian particle trajectory method for the particle phase. Predicted results of mean velocities and fluctuating velocities of both phases agree well with the experimental data, and demonstrate that the main characteristics of the flow are accurately captured by the simulations. Characteristics of separation and reattachments as well as essential features of the coherent structure are obtained, in which the processes of vortex roll up, growth, pairing and breaking up are shown in details. Particle dispersions are then investigated through particles psila instantaneous distributions in coherent structure as well as the mean and fluctuating properties of particle number density (PND). The predicted mean PND agree well with experiment results. For small particles, the instantaneous distributions show much preferential concentration, while their mean PND shows more uniform distribution in downstream region. On the contrary, for large particles, their instantaneous distributions are much uniform (without clear preferential concentration) due to less effect of large eddy coherent, while their mean PND across the section is not uniform for more particles are distributed in the main flow region. The preferential concentration of particles by the large-scale eddies can lead to a high fluctuating PND.
语种	英语
出版者	SP Science in China Press ; Germany
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79026]
专题	清华大学
推荐引用方式 GB/T 7714	Hui Qiang Zhang,Bing Wang,Cheong Ki Chan,et al. Large Eddy Simulation of a dilute particle-laden turbulent flow over a backward-facing step[J],2010, 2010.
APA	Hui Qiang Zhang,Bing Wang,Cheong Ki Chan,&Xi Lin Wang.(2010).Large Eddy Simulation of a dilute particle-laden turbulent flow over a backward-facing step..
MLA	Hui Qiang Zhang,et al."Large Eddy Simulation of a dilute particle-laden turbulent flow over a backward-facing step".(2010).

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