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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.
会议录名称POWDER TECHNOLOGY
2017
会议名称1st International Workshop on Computational Particle Technology
会议日期MAR, 2016
会议地点Suzhou, PEOPLES R CHINA
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.
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
WOS记录号WOS:000401880700027
资助信息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.
收录类别CPCI-S ; EI
语种英语
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文献类型会议论文
条目标识符http://dspace.imech.ac.cn/handle/311007/72167
专题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
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Chen JC,Jin GD,Jin, GD . Large-eddy simulation of turbulent preferential concentration and collision of bidisperse heavy particles in isotropic turbulence[C]. AMSTERDAM:ELSEVIER SCIENCE BV,2017.
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