Higher-order moments and spectra of velocity fluctuations in adverse-pressure-gradient turbulent boundary layer

被引：0
|
作者：
Nagano Y. [1 ]
Houra T. [2 ]
机构：
[1] Department of Mechanical Engineering, Nagoya Institute of Technology, Showa-ku, Nagoya 466-8555, Gokiso-cho
[2] Department of Environmental Technology, Nagoya Institute of Technology, Nagoya
来源：
Experiments in Fluids | 2002年 / 33卷 / 01期
关键词：
Adverse pressure gradients (APG);
D O I：
10.1007/s00348-002-0468-x
中图分类号：
学科分类号：
摘要：
The characteristics of turbulent boundary layer flows with adverse pressure gradients (APGs) differ significantly from those of canonical boundary layers. We have investigated the effects of an APG on the higher-order moments and spectra of velocity fluctuations. The local wavelet spectra reveal a large difference in energy-containing frequencies of streamwise and wall-normal components of turbulent velocities, which results in smaller Reynolds shear stress production. Moreover, an analysis of bispectra in the Fourier space has revealed that non-local interactions, consisting of streamwise fluctuating velocity with low frequency and wall-normal velocity with high frequency, occur in the APG flow. However, the small-scale motions are not affected by imposing an APG.
引用
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页码：22 / 30
页数：8
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