Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows
文献类型：期刊论文
| 作者 | Wu T(吴霆)2; He GW(何国威)1,2
|
| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2020-03-10 |
| 卷号 | 886页码:26 |
| 关键词 | turbulence theory turbulence modelling turbulent boundary layers |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2019.1044 |
| 通讯作者 | He, Guowei(hgw@lnm.imech.ac.cn) |
| 英文摘要 | A statistical model is developed to reconstruct space-time energy spectra in turbulent flows from a non-extensive dataset comprising a time series of velocity fluctuations at a finite number of measurement points. This model is based on a higher approximation of energetic flow structures and developed by using local modulated waves. As a result, it can correctly predict the mean wavenumbers and spectral bandwidths. In contrast, Taylor's frozen-flow hypothesis incorrectly predicts the spectral bandwidths to be zero, and the local wavenumber model significantly under-predicts the spectral bandwidths. An analytical example is formulated to illustrate the present model, and datasets from direct numerical simulations of turbulent channel flows are used to validate this model. The present statistical model is also discussed in terms of the dominating processes of temporal decorrelation in turbulent flows. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | CONVECTION VELOCITIES ; BOUNDARY-LAYER ; NUMBER |
| 资助项目 | NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics'[11988102] ; National Natural Science Foundation of China[11232011] ; National Natural Science Foundation of China[11572331] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040104] ; Strategic Priority Research Program of the Chinese Academy of Sciences[QYZDJ-SSW-SYS002] ; Key Research Program of Frontier Science of the Chinese Academy of Sciences[QYZDJ-SSW-SYS002] |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000506871500001 |
| 资助机构 | NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics' ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Program of Frontier Science of the Chinese Academy of Sciences |
| 其他责任者 | He, Guowei |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/81318]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Wu T,He GW. Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows[J]. JOURNAL OF FLUID MECHANICS,2020,886:26. |
| APA | 吴霆,&何国威.(2020).Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows.JOURNAL OF FLUID MECHANICS,886,26. |
| MLA | 吴霆,et al."Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows".JOURNAL OF FLUID MECHANICS 886(2020):26. |
入库方式： OAI收割
来源：力学研究所
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