Large-eddy simulation of orientation and rotation of ellipsoidal particles in isotropic turbulent  fows

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 orientation and rotation of ellipsoidal particles in isotropic turbulent fows
	Chen JC(陈进财); Jin GD(晋国栋); Zhang J(张健)
刊名	Journal of turbulence
	2015-11-13
卷号	17 期号:3 页码:308-326
ISSN号	1468-5248
中文摘要	The rotational motion and orientational distribution of ellipsoidal particles in turbulent flows are of significance in environmental and engineering applications. Whereas the translational motion of an ellipsoidal particle is controlled by the turbulent motions at large scales, its rotational motion is determined by the fluid velocity gradient tensor at small scales, which raises a challenge when predicting the rotational dispersion of ellipsoidal particles using large-eddy simulation (LES) method due to the lack of subgrid scale (SGS) fluid motions. We report the effects of the SGS fluid motions on the orientational and rotational statistics, such as the alignment between the long axis of ellipsoidal particles and the vorticity, the mean rotational energy at various aspect ratios against those obtained with direct numerical simulation (DNS) and filtered DNS (FDNS). The performances of a stochastic differential equation (SDE) model for the SGS velocity gradient seen by the particles and the approximate deconvolution method (ADM) for LES are investigated. It is found that the missing SGS fluid motions in LES flow fields have significant effects on the rotational statistics of ellipsoidal particles. Alignment between the particles and the vorticity is weakened; and the rotational energy of the particles is reduced in LES. The SGS-SDE model leads to a large error in predicting the alignment between the particles and the vorticity and over-predicts the rotational energy of rod-like particles. The ADM significantly improves the rotational energy prediction of particles in LES.
分类号	二类/Q2
收录类别	SCI
语种	英语
WOS记录号	WOS:000371179200003
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/58214]
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	Chen JC,Jin GD,Zhang J. Large-eddy simulation of orientation and rotation of ellipsoidal particles in isotropic turbulent fows[J]. Journal of turbulence,2015,17(3):308-326.
APA	Chen JC,Jin GD,&Zhang J.(2015).Large-eddy simulation of orientation and rotation of ellipsoidal particles in isotropic turbulent fows.Journal of turbulence,17(3),308-326.
MLA	Chen JC,et al."Large-eddy simulation of orientation and rotation of ellipsoidal particles in isotropic turbulent fows".Journal of turbulence 17.3(2015):308-326.