Independent component analysis of streamwise velocity fluctuations in turbulent channel flows

doi:10.1016/j.taml.2022.100349

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	Independent component analysis of streamwise velocity fluctuations in turbulent channel flows
	Wu T(吴霆); He GW(何国威)
刊名	THEORETICAL AND APPLIED MECHANICS LETTERS
	2022-05
卷号	12 期号:4
关键词	Independent component analysis Turbulent channel flow Proper orthogonal decomposition Third-order moment Localised modes
ISSN号	2095-0349
DOI	10.1016/j.taml.2022.100349
英文摘要	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
分类号	二类
WOS研究方向	Mechanics
语种	英语
资助机构	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]
其他责任者	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.
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/93691]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 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).
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).