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| Effects of Subgrid-Scale Modeling on Time Correlations in Large Eddy Simulation | |
He GW(何国威) ; Rubinstein R; Wang LP; He, GW (reprint author), NASA, Langley Res Ctr, ICASE, Mail Stop 132C, Hampton, VA 23681 USA.
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| Source Publication | Physics of Fluids
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| 2002 | |
| Volume | 14Issue:7Pages:2186-2193 |
| ISSN | 1070-6631 |
| Abstract | The effects of the unresolved subgrid-scale (SGS) motions on the energy balance of the resolved scales in large eddy simulation (LES) have been investigated actively because modeling the energy transfer between the resolved and unresolved scales is crucial to constructing accurate SGS models. But the subgrid scales not only modify the energy balance, they also contribute to temporal decorrelation of the resolved scales. The importance of this effect in applications including the predictability problem and the evaluation of sound radiation by turbulent flows motivates the present study of the effect of SGS modeling on turbulent time correlations. This paper compares the two-point, two-time Eulerian velocity correlation in isotropic homogeneous turbulence evaluated by direct numerical simulation (DNS) with the correlations evaluated by LES using a standard spectral eddy viscosity. It proves convenient to express the two-point correlations in terms of spatial Fourier decomposition of the velocity field. The LES fields are more coherent than the DNS fields: their time correlations decay more slowly at all resolved scales of motion and both their integral scales and microscales are larger than those of the DNS field. Filtering alone is not responsible for this effect: in the Fourier representation, the time correlations of the filtered DNS field are identical to those of the DNS field itself. The possibility of modeling the decorrelating effects of the unresolved scales of motion by including a random force in the model is briefly discussed. The results could have applications to the problem of computing sound sources in isotropic homogeneous turbulence by LES |
| Subject Area | 力学 |
| DOI | 10.1063/1.1483877 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000176549000018 |
| WOS Keyword | ISOTROPIC TURBULENCE ; VISCOSITY ; SOUND |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/16530 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | He, GW (reprint author), NASA, Langley Res Ctr, ICASE, Mail Stop 132C, Hampton, VA 23681 USA. |
| Recommended Citation GB/T 7714 | He GW,Rubinstein R,Wang LP,et al. Effects of Subgrid-Scale Modeling on Time Correlations in Large Eddy Simulation[J]. Physics of Fluids,2002,14,7,:2186-2193. |
| APA | 何国威,Rubinstein R,Wang LP,&He, GW .(2002).Effects of Subgrid-Scale Modeling on Time Correlations in Large Eddy Simulation.Physics of Fluids,14(7),2186-2193. |
| MLA | 何国威,et al."Effects of Subgrid-Scale Modeling on Time Correlations in Large Eddy Simulation".Physics of Fluids 14.7(2002):2186-2193. |
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