| Composition of resolvents enhanced by random sweeping for large scale structures in turbulent channel flows | |
Wu T(吴霆); He GW(何国威)
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| Source Publication | JOURNAL OF FLUID MECHANICS
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| 2023-02-07 | |
| Volume | 956Pages:A31 |
| ISSN | 0022-1120 |
| Abstract | Composite sweeping enhanced resolvents, referred to as the R s(2) model, are proposed to predict the space time statistics of large scale structures in turbulent channel flows. This model incorporates two key mechanisms: (i) eddy damping is introduced to represent random sweeping decorrelation caused by nonlinear forcing, leading to a sweeping enhanced resolvent R s; and (ii) the sweeping enhanced resolvent R s is composited into its iterations R s(2) to yield non zero Taylor time microscales. The resulting R s(2) model can correctly predict the frequency spectra and two point cross spectra of large scale structures. This model is compared numerically with eddy viscosity enhanced resolvent models. The latter are designed to represent energy transfer instead for time decorrelation, and thus underpredict the characteristic decay time scales. The R s(2) model correctly yields the characteristic decay time scales in turbulent channel flows. |
| Keyword | turbulence modelling turbulent boundary layers |
| DOI | 10.1017/jfm.2023.39 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000927887700001 |
| WOS Research Area | Mechanics ; Physics, Fluids & Plasmas |
| WOS Subject | Mechanics ; Physics |
| Funding Organization | NSFC Basic Science Center Program for Multiscale Problems inNonlinear Mechanics' [11988102] ; National Natural Science Foundation of China [12002344, 11232011, 11572331] ; China PostdoctoralScience Foundation [2020M670478] ; Strategic Priority Research Program [XDB22040104] |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | He, GW (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. ; He, GW (corresponding author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China. |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/91811 |
| 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. Composition of resolvents enhanced by random sweeping for large scale structures in turbulent channel flows[J]. JOURNAL OF FLUID MECHANICS,2023,956:A31.Rp_Au:He, GW (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China., He, GW (corresponding author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China. |
| APA | 吴霆,&何国威.(2023).Composition of resolvents enhanced by random sweeping for large scale structures in turbulent channel flows.JOURNAL OF FLUID MECHANICS,956,A31. |
| MLA | 吴霆,et al."Composition of resolvents enhanced by random sweeping for large scale structures in turbulent channel flows".JOURNAL OF FLUID MECHANICS 956(2023):A31. |
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| Jp2023A222.pdf（1735KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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