1713 高レイノルズ数壁面せん断乱流の階層構造(J13 乱流とマルチフィジックスのモデリング,J13 乱流とマルチフィジックスのモデリング)

概要

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To investigate the hierarchical structure of turbulent wall shear flows, direct numerical simulation of turbulent channel flow has been conducted for Re_τ=1270. The central axes of coherent fine scale eddies (CFSEs) are identified, and spatial distributions of the axes of the CFSEs and characteristics of the flow field are visualized by using a new method. The low-speed regions in the logarithmic law region are composed of many CFSEs or the cluster of the CFSEs with relatively strong swirling motions. The scale growth of clusters of CFSEs with a distance from the wall is deeply related with the scale growth of the low-speed regions in the logarithmic law region. The cluster of the CFSEs is closely related to turbulence production in the logarithmic regions
社団法人日本機械学会の論文
2007-09-07