A study of inner-outer interactions in turbulent channel flows by interactive POD

doi:10.1016/j.taml.2021.100222

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	A study of inner-outer interactions in turbulent channel flows by interactive POD
	Wang HP(王洪平); Gao, Qi 2
刊名	THEORETICAL AND APPLIED MECHANICS LETTERS
	2021-01
卷号	11 期号:1 页码:100222
关键词	Wall turbulence Interactive POD Inner-outer interaction Amplitude modulation Frequency modulation
ISSN号	2095-0349
DOI	10.1016/j.taml.2021.100222
英文摘要	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.
分类号	二类
WOS研究方向	Mechanics
语种	英语
资助机构	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
其他责任者	Gao, Q (corresponding author), Zhejiang Univ, Sch Aeronaut & Astronaut, Dept Mech, State Key Lab Fluid Power & Mechatron Syst, Hangzhou 310058, Peoples R China.
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/93702]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Zhejiang Univ, Sch Aeronaut & Astronaut, Dept Mech, State Key Lab Fluid Power & Mechatron Syst, Hangzhou 310058, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 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.
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.