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Large eddy simulation of orientation and rotation of ellipsoidal particles in isotropic turbulent flows
Chen JC(陈进财); Jin GD(晋国栋); Zhang J(张健); Jin, GD (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
Source PublicationJOURNAL OF TURBULENCE
2016
Volume17Issue:3Pages:308-326
ISSN1468-5248
AbstractThe 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. 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.
KeywordFibres Rotational Dynamics Large Eddy Simulation Subgrid Scale Model Approximate Deconvolution Method
DOI10.1080/14685248.2015.1093638
Indexed BySCI
Language英语
WOS IDWOS:000371179200003
WOS KeywordLAGRANGIAN STATISTICS ; FLUID-MECHANICS ; MOTION ; DYNAMICS ; FIBERS ; MICROORGANISMS ; GRADIENT
WOS Research AreaMechanics ; Physics, Fluids & Plasmas
Funding OrganizationThis work was supported by the 973 Program of China [grant number 2013CB834100] ; the National Natural Science Associate Foundation (NSAF) of China [grant number U1230126] ; the National Natural Science Foundation of China (NSFC) [grant number 11232011], [grant number 11472277].
DepartmentLNM湍流
ClassificationQ3
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/71958
Collection非线性力学国家重点实验室
Corresponding AuthorJin, GD (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
Recommended Citation
GB/T 7714
Chen JC,Jin GD,Zhang J,et al. Large eddy simulation of orientation and rotation of ellipsoidal particles in isotropic turbulent flows[J]. JOURNAL OF TURBULENCE,2016,17(3):308-326.
APA 陈进财,晋国栋,张健,&Jin, GD .(2016).Large eddy simulation of orientation and rotation of ellipsoidal particles in isotropic turbulent flows.JOURNAL OF TURBULENCE,17(3),308-326.
MLA 陈进财,et al."Large eddy simulation of orientation and rotation of ellipsoidal particles in isotropic turbulent flows".JOURNAL OF TURBULENCE 17.3(2016):308-326.
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