Subgrid-scale contributions to Lagrangian time correlations in isotropic turbulence
文献类型：期刊论文
| 作者 | Zhang J(张健) ; He GW(何国威); Lu LP(陆利蓬)
|
| 刊名 | Acta Mechanica Sinica
 |
| 出版日期 | 2009 |
| 卷号 | 25期号:1页码:45-49 |
| 通讯作者邮箱 | hgw@lnm.imech.ac.cn |
| 关键词 | Isotropic turbulence · Large eddy simulation · Lagrangian time correlation · Enstrophy spectra |
| ISSN号 | 0567-7718 |
| 通讯作者 | 何国威 |
| 合作状况 | 国内 |
| 中文摘要 | The application of large-eddy simulation (LES) to particle-laden turbulence raises such a fundamental question as whether the LES with a subgrid scale (SGS) model can correctly predict Lagrangian time correlations (LTCs). Most of the currently existing SGS models are constructed based on the energy budget equations. Therefore, they are able to correctly predict energy spectra, but they may not ensure the correct prediction on the LTCs. Previous researches investigated the effect of the SGS modeling on the Eulerian time correlations. This paper is devoted to study the LTCs in LES. A direct numerical simulation (DNS) and the LES with a spectral eddy viscosity model are performed for isotropic turbulence and the LTCs are calculated using the passive vector method. Both a priori and a posteriori tests are carried out. It is observed that the subgrid-scale contributions to the LTCs cannot be simply ignored and the LES overpredicts the LTCs than the DNS. It is concluded from the straining hypothesis that an accurate prediction of enstrophy spectra is most critical to the prediction of the LTCs. |
| 学科主题 | 流体力学 |
| 类目[WOS] | Engineering, Mechanical ; Mechanics |
| 研究领域[WOS] | Engineering ; Mechanics |
| 关键词[WOS] | LARGE-EDDY SIMULATION ; DIRECT NUMERICAL SIMULATIONS ; STATISTICS ; VELOCITY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000262825000005 |
| 公开日期 | 2009-12-28 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/32998]  |
| 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 | Zhang J,He GW,Lu LP. Subgrid-scale contributions to Lagrangian time correlations in isotropic turbulence[J]. Acta Mechanica Sinica,2009,25(1):45-49. |
| APA | 张健,何国威,&陆利蓬.(2009).Subgrid-scale contributions to Lagrangian time correlations in isotropic turbulence.Acta Mechanica Sinica,25(1),45-49. |
| MLA | 张健,et al."Subgrid-scale contributions to Lagrangian time correlations in isotropic turbulence".Acta Mechanica Sinica 25.1(2009):45-49. |
入库方式： OAI收割
来源：力学研究所
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