Assessment of large-eddy simulation in capturing preferential concentration of heavy particles in isotropic turbulent flows

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	Assessment of large-eddy simulation in capturing preferential concentration of heavy particles in isotropic turbulent flows
	Jin GD(晋国栋); Zhang J(张健); He GW(何国威); Wang LP
刊名	Physica Scripta
	2010-12
通讯作者邮箱	hgw@lnm.imech.ac.cn
卷号	T142 页码:014061/1-014061/6
ISSN号	0031-8949
通讯作者	Jin, GD (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
产权排序	[Jin, Guodong; Zhang, Jian; He, Guo-Wei; Wang, Lian-Ping] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China; [Wang, Lian-Ping] Univ Delaware, Dept Mech Engn, Newark, DE 19716 USA
中文摘要	Particle-laden turbulent flow is a typical non-equilibrium process characterized by particle relaxation time tau(p) and the characteristic timescale of the flows tau(f), in which the turbulent mixing of heavy particles is related to different scales of fluid motions. The preferential concentration (PC) of heavy particles could be strongly affected by fluid motion at dissipation-range scales, which presents a major challenge to the large-eddy simulation (LES) approach. The errors in simulated PC by LES are due to both filtering and the subgrid scale (SGS) eddy viscosity model. The former leads to the removal of the SGS motion and the latter usually results in a more spatiotemporally correlated vorticity field. The dependence of these two factors on the flow Reynolds number is assessed using a priori and a posteriori tests, respectively. The results suggest that filtering is the dominant factor for the under-prediction of the PC for Stokes numbers less than 1, while the SGS eddy viscosity model is the dominant factor for the over-prediction of the PC for Stokes numbers between 1 and 10. The effects of the SGS eddy viscosity model on the PC decrease as the Reynolds number and Stokes number increase. LES can well predict the PC for particle Stokes numbers larger than 10. An SGS model for particles with small and intermediate Stokes numbers is needed to account for the effects of the removed SGS turbulent motion on the PC.
学科主题	湍流
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	INERTIAL PARTICLES ; HOMOGENEOUS TURBULENCE ; STATISTICS ; COLLISION ; VELOCITY ; SCALES
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.1088/0031-8949/2010/T142/014061
语种	英语
WOS记录号	WOS:000285777700063
公开日期	2014-04-04
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/48716]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Jin GD,Zhang J,He GW,et al. Assessment of large-eddy simulation in capturing preferential concentration of heavy particles in isotropic turbulent flows[J]. Physica Scripta,2010,T142:014061/1-014061/6.
APA	晋国栋,张健,何国威,&Wang LP.(2010).Assessment of large-eddy simulation in capturing preferential concentration of heavy particles in isotropic turbulent flows.Physica Scripta,T142,014061/1-014061/6.
MLA	晋国栋,et al."Assessment of large-eddy simulation in capturing preferential concentration of heavy particles in isotropic turbulent flows".Physica Scripta T142(2010):014061/1-014061/6.