Spectral scaling in a high reynolds number laboratory boundary layer
Spectral scaling in a high reynolds number laboratory boundary layer
复制标题
高雷诺数实验室边界层中的光谱缩放
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
M. Raupach
中科院分区：
文献类型：
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作者：
R. Antonia;M. Raupach
Spectra and co-spectra of the streamwise (u) and normal or vertical (w) velocity fluctuations have been measured in the inner region of a large Reynolds number laboratory boundary layer over a rough wall. There is reasonable evidence of ak1−1 range in theu spectrum (wherek1 is the streamwise wavenumber). Such a range results from an overlap between a spectral region dominated by largescale, inactive motion, which scales on the boundary-layer thickness, and a region dominated by smaller-scale, active motion which scales on the distance from the wall. Spectra ofw, anduw cospectra, scale in a manner consistent with the dominance by active motion. The present spectral data do not support local isotropy over the inertial subrange. A comparison between measuredw spectra and calculations based on isotropy indicates that the inertial subrange anisotropy is only slightly affected by the magnitude of the non-dimensional mean shear.
