| Independent component analysis of streamwise velocity fluctuations in turbulent channel flows | |
Wu T(吴霆); He GW(何国威)
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| Source Publication | THEORETICAL AND APPLIED MECHANICS LETTERS
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| 2022-05 | |
| Volume | 12Issue:4 |
| ISSN | 2095-0349 |
| Abstract | Independent component analysis (ICA) is used to study the multiscale localised modes of streamwise velocity fluctuations in turbulent channel flows. ICA aims to decompose signals into independent modes, which may induce spatially localised objects. The height and size are defined to quantify the spatial position and extension of these ICA modes, respectively. In contrast to spatially extended proper orthogonal decomposition (POD) modes, ICA modes are typically localised in space, and the energy of some modes is distributed across the near-wall region. The sizes of ICA modes are multiscale and are approximately proportional to their heights. ICA modes can also help to reconstruct the statistics of turbulence, particularly the third-order moment of velocity fluctuations, which is related to the strongest Reynolds shear-stressproducing events. The results reported in this paper indicate that the ICA method may connect statistical descriptions and structural descriptions of turbulence. (c) 2022 The Authors. Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics. This is an open access article under the CC BY-NC-ND license |
| Keyword | Independent component analysis Turbulent channel flow Proper orthogonal decomposition Third-order moment Localised modes |
| DOI | 10.1016/j.taml.2022.100349 |
| Indexed By | CSCD |
| Language | 英语 |
| WOS Research Area | Mechanics |
| Funding Organization | NSFC Basic Science Center Program [11988102] ; National Natural Science Foundation of China [12002344, 11232011, 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] |
| Classification | 二类 |
| 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/311007/93691 |
| 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. Independent component analysis of streamwise velocity fluctuations in turbulent channel flows[J]. THEORETICAL AND APPLIED MECHANICS LETTERS,2022,12,4,.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.(2022).Independent component analysis of streamwise velocity fluctuations in turbulent channel flows.THEORETICAL AND APPLIED MECHANICS LETTERS,12(4). |
| MLA | 吴霆,et al."Independent component analysis of streamwise velocity fluctuations in turbulent channel flows".THEORETICAL AND APPLIED MECHANICS LETTERS 12.4(2022). |
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| TAML008.pdf（3373KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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