LES prediction of space-time correlations in turbulent shear flows
文献类型：期刊论文
| 作者 | Guo L(郭力); Li D(李栋); Zhang X(张星) ; He GW(何国威)
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| 刊名 | ACTA MECHANICA SINICA
 |
| 出版日期 | 2012-08-01 |
| 卷号 | 28期号:4页码:993-998 |
| 通讯作者邮箱 | hgw@lnm.imech.ac.cn |
| 关键词 | Large-eddy simulation Subgrid scale model Space-time correlation Turbulent shear flows Large-Eddy Simulation Channel Flow Backscatter Velocity Models Field |
| ISSN号 | 0567-7718 |
| 产权排序 | [Guo, Li;Li, Dong; Zhang, Xing; He, Guo-Wei] Chinese Acad Sci, LNM, Inst Mech, Beijing 100190, Peoples R China |
| 通讯作者 | He, GW ; Chinese Acad Sci, LNM, Inst Mech, Beijing 100190, Peoples R China. |
| 中文摘要 | We compare the space-time correlations calculated from direct numerical simulation (DNS) and large-eddy simulation (LES) of turbulent channel flows. It is found from the comparisons that the LES with an eddy-viscosity sub-grid scale (SGS) model over-predicts the space-time correlations than the DNS. The overpredictions are further quantified by the integral scales of directional correlations and convection velocities. A physical argument for the overprediction is provided that the eddy-viscosity SGS model alone does not includes the backscatter effects although it correctly represents the energy dissipations of SGS motions. This argument is confirmed by the recently developed elliptic model for space-time correlations in turbulent shear flows. It suggests that enstrophy is crucial to the LES prediction of space-time correlations. The random forcing models and stochastic SGS models are proposed to overcome the overpredictions on space-time correlations. |
| 学科主题 | 湍流 |
| 分类号 | 二类 |
| 收录类别 | SCI ; EI ; CSCD |
| 资助信息 | The project was supported by the National Basic Research Program of China (973 Program) (2007CB814800) and the National Natural Science Foundation of China (10325211 and 10628206). |
| 原文出处 | http://dx.doi.org/10.1007/s10409-012-0088-5 |
| 语种 | 英语 |
| WOS记录号 | WOS:000308542200009 |
| 公开日期 | 2013-01-18 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/46708]  |
| 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 | Guo L,Li D,Zhang X,et al. LES prediction of space-time correlations in turbulent shear flows[J]. ACTA MECHANICA SINICA,2012,28(4):993-998. |
| APA | Guo L,Li D,Zhang X,&He GW.(2012).LES prediction of space-time correlations in turbulent shear flows.ACTA MECHANICA SINICA,28(4),993-998. |
| MLA | Guo L,et al."LES prediction of space-time correlations in turbulent shear flows".ACTA MECHANICA SINICA 28.4(2012):993-998. |
入库方式： OAI收割
来源：力学研究所
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