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Title:
Large-eddy simulation of turbulent preferential concentration and collision of bidisperse heavy particles in isotropic turbulence
Author: Chen JC(陈进财); Jin GD(晋国栋)
Source: POWDER TECHNOLOGY
Issued Date: 2017-06-01
Volume: 314, Pages:281-290
Abstract: 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.
Keyword: Particle-laden turbulence ; Large-eddy simulation ; Subgrid scale motion ; Bidisperse particles ; Preferential concentration ; Collision rate
Language: 英语
Indexed Type: SCI ; CPCI-S ; EI
DOI: 10.1016/j.powtec.2016.12.069
DOC Type: Article
WOS Subject: Engineering, Chemical
WOS Subject Extended: Engineering
WOS Keyword Plus: DIRECT NUMERICAL SIMULATIONS ; SPACE-TIME CORRELATIONS ; INERTIAL PARTICLES ; APPROXIMATE DECONVOLUTION ; CLOUD DROPLETS ; FLUIDIZED-BED ; FLOW ; MODEL ; MOTION ; ATTENUATION
WOS ID: WOS:000401880700027
ISSN: 0032-5910
Funder: National Natural Science Foundation of China(11472277 ; Strategic Priority Research Program CAS(XDB22040104) ; Key Research Program of Frontier Sciences CAS(QYZDJ-SSW-SYS002) ; Science Challenge Program(JCKY2016212A501) ; 973 Program of China(2013CB834100) ; 11232011)
Department: LNM湍流
First Institution (Yes or Not): true
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60547
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Chen JC,Jin GD. Large-eddy simulation of turbulent preferential concentration and collision of bidisperse heavy particles in isotropic turbulence[J]. POWDER TECHNOLOGY,2017-06-01,314:281-290.
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