E334 一様等方性乱流中の微細渦クラスターと階層構造(E-33 乱流渦構造(3),一般講演)

概要

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To investigate relations between hierarchical structure of turbulence and clusters of coherent fine scale eddies, direct numerical simulation database of homogeneous isotropic turbulence up to Re_λ=222.7 have been analyzed. Number density weighted by the second invariant, diameter and maximum azimuthal velocity of the coherent fine scale eddies depend on the local turbulent kinetic energy and strain rate of the large scale component of velocity. The cluster of the strong coherent fine scale eddies tends to exist in the region with high local turbulent kinetic energy and strain rate of large scales. The diameter and maximum azimuthal velocity of coherent fine scale eddies can be normalized with local Kolmogorov scale and local Kolmogorov velocity defined in the cube of integral scale. The most expected diameter and maximum azimuthal velocity in this normalization are about 10 times local Kolmogorov scale and about 1.5 times local Kolmogorov velocity.
日本流体力学会の論文
2004-08-09