| Stochastic dynamical model for space-time energy spectra in turbulent shear flows | |
Wu T(吴霆)1,2; He GW(何国威)1,2
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| Corresponding Author | He, Guowei([email protected]) |
| Source Publication | PHYSICAL REVIEW FLUIDS
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| 2021-05-06 | |
| Volume | 6Issue:5Pages:23 |
| ISSN | 2469-990X |
| Abstract | Space-time energy spectra describe the distribution of energy density over space and timescales, which are fundamental to studying dynamic coupling at spatial and temporal scales and turbulence-generated noise. The present paper develops a dynamic autoregressive (DAR) random forcing model for space-time energy spectra in turbulent shear flows. This model includes the two essential mechanisms of statistical decorrelation: the convection proposed by Taylor's model and the random sweeping proposed by the Kraichnan-Tennekes model. The new development is that DAR random forcing is introduced to represent the random sweeping effect. The resulting model can correctly reproduce the convection velocity and spectral bandwidths, while a white-in-time random forcing model makes erroneous predictions on spectral bandwidths. The DAR model is further combined with linear stochastic estimation (LSE) to reconstruct the near-wall velocity fluctuations of the desired space-time energy spectra. Direct numerical simulation of turbulent channel flows is used to validate the DAR model and evaluate the Werner-Wengle wall model and the LSE approach. Both the wall model and LSE incorrectly estimate the spectral bandwidths. |
| DOI | 10.1103/PhysRevFluids.6.054602 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000652861900002 |
| WOS Keyword | SPATIOTEMPORAL SPECTRA ; AMPLIFICATION ; LAYER |
| WOS Research Area | Physics |
| WOS Subject | Physics, Fluids & Plasmas |
| Funding Project | NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; National Natural Science Foundation of China[12002344] ; National Natural Science Foundation of China[11232011] ; National Natural Science Foundation of China[11572331] ; China Postdoctoral Science Foundation[2020M670478] ; Strategic Priority Research Program[XDB22040104] ; Key Research Program of Frontier Sciences 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 ; China Postdoctoral Science Foundation ; Strategic Priority Research Program ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | He, Guowei |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/86715 |
| 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. Stochastic dynamical model for space-time energy spectra in turbulent shear flows[J]. PHYSICAL REVIEW FLUIDS,2021,6,5,:23.Rp_Au:He, Guowei |
| APA | 吴霆,&何国威.(2021).Stochastic dynamical model for space-time energy spectra in turbulent shear flows.PHYSICAL REVIEW FLUIDS,6(5),23. |
| MLA | 吴霆,et al."Stochastic dynamical model for space-time energy spectra in turbulent shear flows".PHYSICAL REVIEW FLUIDS 6.5(2021):23. |
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| Jp2021F212.pdf（3118KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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