| Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows | |
Wu T(吴霆)1; He GW(何国威)1,2
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| Corresponding Author | He, Guowei([email protected]) |
| Source Publication | JOURNAL OF FLUID MECHANICS
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| 2020-03-10 | |
| Volume | 886Pages:26 |
| ISSN | 0022-1120 |
| Abstract | 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. |
| Keyword | turbulence theory turbulence modelling turbulent boundary layers |
| DOI | 10.1017/jfm.2019.1044 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000506871500001 |
| WOS Keyword | CONVECTION VELOCITIES ; BOUNDARY-LAYER ; NUMBER |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | 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] |
| Funding Organization | 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 |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | He, Guowei |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/81319 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation 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.Rp_Au:He, Guowei |
| 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. |
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| Jp2020049.pdf（3524KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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