Burst event detection in wall turbulence by WVITA method

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	Burst event detection in wall turbulence by WVITA method
	Jiang N(姜楠); Shu W(舒玮); Wang ZD(王振东)
刊名	Acta Mechanica Sinica
	2000
卷号	16 期号:1 页码:29-34
ISSN号	0567-7718
通讯作者	Jiang, N (reprint author), Tianjin Univ, Dept Mech, Tianjin 300072, Peoples R China.
中文摘要	Wavelet Variable Interval Time Average (WVITA) is introduced as a method incorporating burst event detection in wall turbulence. Wavelet transform is performed to unfold the longitudinal fluctuating velocity time series measured in the near wall region of a turbulent boundary layer using hot-film anemometer. This unfolding is both in time and in space simultaneously. The splitted kinetic of the longitudinal fluctuating velocity time series among different scales is obtained by integrating the square of wavelet coefficient modulus over temporal space. The time scale that related to burst events in wall turbulence passing through the fixed probe is ascertained by maximum criterion of the kinetic energy evolution across scales. Wavelet transformed localized variance of the fluctuating velocity time series at the maximum kinetic scale is put forward instead of localized short time average variance in Variable Interval Time Average (VITA) scheme. The burst event detection result shows that WVITA scheme can avoid erroneous judgement and solve the grouping problem more effectively which is caused by VITA scheme itself and can not be avoided by adjusting the threshold level or changing the short time average interval.
学科主题	力学
类目[WOS]	Engineering, Mechanical ; Mechanics
研究领域[WOS]	Engineering ; Mechanics
关键词[WOS]	BOUNDARY-LAYER
收录类别	SCI ; EI ; CSCD
语种	英语
WOS记录号	WOS:000086126700004
公开日期	2007-06-15 ; 2007-12-05 ; 2009-06-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/16374]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Jiang N,Shu W,Wang ZD. Burst event detection in wall turbulence by WVITA method[J]. Acta Mechanica Sinica,2000,16(1):29-34.
APA	姜楠,舒玮,&王振东.(2000).Burst event detection in wall turbulence by WVITA method.Acta Mechanica Sinica,16(1),29-34.
MLA	姜楠,et al."Burst event detection in wall turbulence by WVITA method".Acta Mechanica Sinica 16.1(2000):29-34.