| Subgrid-scale contributions to Lagrangian time correlations in isotropic turbulence | |
Zhang J(张健) ; He GW(何国威); Lu LP(陆利蓬)
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| Source Publication | Acta Mechanica Sinica
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| 2009 | |
| Volume | 25Issue:1Pages:45-49 |
| ISSN | 0567-7718 |
| Abstract | 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. |
| Keyword | Isotropic Turbulence · Large Eddy Simulation · Lagrangian Time Correlation · Enstrophy Spectra |
| Subject Area | 流体力学 |
| DOI | 10.1007/s10409-008-0220-8 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000262825000005 |
| WOS Keyword | LARGE-EDDY SIMULATION ; DIRECT NUMERICAL SIMULATIONS ; STATISTICS ; VELOCITY |
| WOS Research Area | Engineering ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Mechanics |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/32998 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | He GW(何国威) |
| Recommended Citation 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. |
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