| A study of inner-outer interactions in turbulent channel flows by interactive POD | |
| Wang HP(王洪平); Gao, Qi2 | |
| Source Publication | THEORETICAL AND APPLIED MECHANICS LETTERS
 |
| 2021-01 | |
| Volume | 11Issue:1Pages:100222 |
| ISSN | 2095-0349 |
| Abstract | The amplitude and frequency modulation of near-wall flow structures by the large-scale motions in outer regions is studied in turbulent channel flows. The proper orthogonal decomposition (POD) method is applied to investigate the interactions between the near-wall motions and the large-scale flow modes of the outer regions based on two datasets from direct numerical simulation of turbulent channel flows at Reynolds numbers of 550-1000. The fluctuations in the fields u(+), v(+), w(+) and Reynolds shear stress -(uv)(+) are studied to understand the mechanism of amplitude and frequency modulation of the near-wall structures by the outer large-scale motions. The amplitude modulation coefficient of the Reynolds shear stress is larger than that of the velocity components. The frequency modulation effect has an opposite influence in the spanwise direction compared to the streamwise direction. The streamwise characteristic frequency increases with increasing large-scale velocity. However, the spanwise characteristic frequency exhibits a decreasing trend with increasing large-scale velocity in the near-wall region. (C) 2021 Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics. |
| Keyword | Wall turbulence Interactive POD Inner-outer interaction Amplitude modulation Frequency modulation |
| DOI | 10.1016/j.taml.2021.100222 |
| Indexed By | CSCD |
| Language | 英语 |
| WOS Research Area | Mechanics |
| Funding Organization | Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics [11988102] ; National Natural Science Foundation of China [91852204, 11702302] ; National Key R&D Program of China [2020YFA0405700] ; National Natural Science Foundation of China |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | Gao, Q (corresponding author), Zhejiang Univ, Sch Aeronaut & Astronaut, Dept Mech, State Key Lab Fluid Power & Mechatron Syst, Hangzhou 310058, Peoples R China. |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/93702 |
| 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 3.Zhejiang Univ, Sch Aeronaut & Astronaut, Dept Mech, State Key Lab Fluid Power & Mechatron Syst, Hangzhou 310058, Peoples R China |
| Recommended Citation GB/T 7714 | Wang HP,Gao, Qi. A study of inner-outer interactions in turbulent channel flows by interactive POD[J]. THEORETICAL AND APPLIED MECHANICS LETTERS,2021,11,1,:100222.Rp_Au:Gao, Q (corresponding author), Zhejiang Univ, Sch Aeronaut & Astronaut, Dept Mech, State Key Lab Fluid Power & Mechatron Syst, Hangzhou 310058, Peoples R China. |
| APA | 王洪平,&Gao, Qi.(2021).A study of inner-outer interactions in turbulent channel flows by interactive POD.THEORETICAL AND APPLIED MECHANICS LETTERS,11(1),100222. |
| MLA | 王洪平,et al."A study of inner-outer interactions in turbulent channel flows by interactive POD".THEORETICAL AND APPLIED MECHANICS LETTERS 11.1(2021):100222. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| TAML019.pdf（2560KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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