Knowledge Management System of Institue of Mechanics, CAS
| Burst event detection in wall turbulence by WVITA method | |
Jiang N(姜楠) ; Shu W(舒玮); Wang ZD(王振东); Jiang, N (reprint author), Tianjin Univ, Dept Mech, Tianjin 300072, Peoples R China.
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| Source Publication | Acta Mechanica Sinica
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| 2000 | |
| Volume | 16Issue:1Pages:29-34 |
| ISSN | 0567-7718 |
| Abstract | 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. |
| Subject Area | 力学 |
| Indexed By | SCI ; EI ; CSCD |
| Language | 英语 |
| WOS ID | WOS:000086126700004 |
| WOS Keyword | BOUNDARY-LAYER |
| WOS Research Area | Engineering ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Mechanics |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/16374 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Jiang, N (reprint author), Tianjin Univ, Dept Mech, Tianjin 300072, Peoples R China. |
| Recommended Citation GB/T 7714 | Jiang N,Shu W,Wang ZD,et al. 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,&Jiang, N .(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. |
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