壁面せん断乱流における大規模構造と微細渦(乱流渦構造(2),一般講演)

概要

論文の詳細を見る
To investigate fine-scale and large-scale structures 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 the production of the Reynolds stress and the dissipation rate of the kinetic energy in the logarithmic regions.
日本流体力学会の論文
2007-08-06