Large-eddy simulation of turbulent preferential concentration and collision of bidisperse heavy particles in isotropic turbulence

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Large-eddy simulation of turbulent preferential concentration and collision of bidisperse heavy particles in isotropic turbulence
	Chen JC(陈进财); Jin GD(晋国栋); Jin, GD (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
	2017
会议日期	MAR, 2016
会议地点	Suzhou, PEOPLES R CHINA
关键词	Direct Numerical Simulations Space-time Correlations Inertial Particles Approximate Deconvolution Cloud Droplets Fluidized-bed Flow Model Motion Particle-laden Turbulence Large-eddy Simulation Subgrid Scale Motion Bidisperse Particles Preferential Concentration Collision Rate Attenuation
英文摘要	Particle-laden turbulent flows are ubiquitous in natural and engineering flows. The preferential concentration and pair-statistics of heavy particles at small and intermediate Stokes numbers are mainly related to the small-scale motions, which are missing in conventional large-eddy simulation (LES). Therefore, studies on the effects of subgrid scale (SGS) motions on particle-pair statistics are significant. This paper will study the effects of SGS motions on the collision-related statistics of a bidisperse system that involves two groups of particles at different Stokes numbers using a direct numerical simulation (DNS), filtered DNS (FDNS) and LES. Compared with a monodisperse system at a single Stokes number, the relative error of the collision rates in the bidisperse system is much smaller than that in the monodisperse one. For given filter widths and Stokes numbers, the relative errors between the FDNS and LES are much smaller than their relative errors to DNS, implying that the error caused by the filtering operation in LES plays a leading role in the overall error of the particle collision rate at Stokes numbers less than 3. A particle SGS model is, thus, necessary to consider the effect of SGS motions on bidisperse heavy particles. (C) 2016 Elsevier B.V. All rights reserved.
会议录	POWDER TECHNOLOGY
资助机构	This work was supported by the National Natural Science Foundation of China (11472277 and 11232011), Strategic Priority Research Program, CAS (XDB22040104), Key Research Program of Frontier Sciences, CAS (QYZDJ-SSW-SYS002), Science Challenge Program (JCKY2016212A501) and the 973 Program of China (2013CB834100). JGD would like to thank Professor Lian-Ping Wang at University of Delaware, USA for the discussion and help during the work of this paper. The anonymous reviewers are much appreciated for the constructive suggestions to improve the manuscript.
会议录出版者	ELSEVIER SCIENCE BV
会议录出版地	AMSTERDAM
语种	英语
WOS记录号	WOS:000401880700027
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/72167]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Jin, GD (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
作者单位	1.[Jin, Guodong] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Chen JC,Jin GD,Jin, GD . Large-eddy simulation of turbulent preferential concentration and collision of bidisperse heavy particles in isotropic turbulence[C]. 见:. Suzhou, PEOPLES R CHINA. MAR, 2016.