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The spanwise spectra in wall-bounded turbulence

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文摘 The pre-multiplied spanwise energy spectra of streamwise velocity fluctuations are investigated in this paper. Two distinct spectral peaks in the spanwise spectra are observed in low-Reynolds-numberwall-bounded turbulence. The spectra are calculated from direct numerical simulation (DNS)of turbulent channel flows and zero-pressure-gradient boundary layer flows. These two peaks locate in the nearwall and outer regions and are referred to as the inner peak and the outer peak, respectively. This result implies that the streamwise velocity fluctuations can be separated into large and small scales in the spanwise direction even though the friction Reynolds number Re_τ can be as low as 1000. The properties of the inner and outer peaks in the spanwise spectra are analyzed. The locations of the inner peak are invariant over a range of Reynolds numbers. However, the locations of the outer peak are associated with the Reynolds number, which are much higher than those of the outer peak of the pre-multiplied streamwise energy spectra of the streamwise velocity.
来源 Acta Mechanica Sinica ,2018,34(3):452-461 【核心库】
DOI 10.1007/s10409-017-0731-2
关键词 Wall-bounded turbulence ; Streamwise/spanwise spectra ; Scale separation ; Inner/outer peak
地址

1. Institute of Mechanics,Chinese Academy of Sciences, State Key Laboratory of Nonlinear Mechanics, Beijing, 100190  

2. School of Engineering Sciences,University of Chinese Academy of Sciences, Beijing, 100049

语种 英文
文献类型 研究性论文
ISSN 0567-7718
学科 力学
基金 国家自然科学基金 ;  support from the Strategic Priority Research Program ;  theKey Research Program of Frontier Sciences of the Chinese Academy of Sciences ;  the National Basic Research Program of China (973 Program) : Nonlinear Science
文献收藏号 CSCD:6274409

参考文献 共 33 共2页

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引证文献 3 篇

1 Wang Hongping A study of inner-outer interactions in turbulent channel flows by interactive POD Theoretical and Applied Mechanics Letters,2021,11(1):2-13
CSCD被引 0 次

2 Wang Xinwei Effects of the slip wall on the drag and coherent structures of turbulent boundary layer Acta Mechanica Sinica,2021,37(8):1278-1290
CSCD被引 0 次

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