| 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)
| |
| Source Publication | Journal of turbulence
 |
| 2015-11-13 | |
| Volume | 17Issue:3Pages:308-326 |
| ISSN | 1468-5248 |
| Abstract |
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. |
| DOI | 10.1080/14685248.2015.1093638 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000371179200003 |
| Funding Organization | 973 Program of China:2013CB834100 National Natural Science Associate Foundation (NSAF) of China: U1230126 ; National Natural Science Foundation of China (NSFC) :11232011, 11472277 |
| Department | LNM湍流 |
| Classification | 二类/Q2 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/58214 |
| Collection | 非线性力学国家重点实验室 |
| Recommended Citation 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. |
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| File Name/Size | DocType | Version | Access | License | ||
| J2015-010.pdf（2831KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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