| 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; Jin, GD (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
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| Source Publication | Physica Scripta
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| 2010-12 | |
| Volume | T142Pages:014061/1-014061/6 |
| ISSN | 0031-8949 |
| Abstract | 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. |
| Subject Area | 多相流 ; 湍流 |
| DOI | 10.1088/0031-8949/2010/T142/014061 |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000285777700063 |
| WOS Keyword | INERTIAL PARTICLES ; HOMOGENEOUS TURBULENCE ; STATISTICS ; COLLISION ; VELOCITY ; SCALES |
| WOS Research Area | Physics |
| WOS Subject | Physics, Multidisciplinary |
| Department | 非线性力学国家重点实验室 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/48716 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | Jin, GD (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China. |
| Recommended Citation 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,&Jin, GD .(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. |
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