軸対称異方性乱流場の実験的解析 : 第3報,軸対称乱流の非等方テンソル,渦スケールの非等方性および確率密度分布

概要

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A homogeneous cigar-shaped axisymmetric turbulence field was experimentally analyzed. The anisotropy tensor, scale anisotropy and probability density distribution were obtained from velocity fluctuations. The behavior of these parameters was interpreted by a model of eddy structure and related to the streamwise evolution of the spectra. The isotropy was recovered at first by large-scale turbulent eddies and then by smaller ones. The axisymmetric turbulence did not attain complete isotropy but reached a quasi-equilibrium state with weak anisotropy in the far downstream region. The probability density distribution of turbulent fluctuation was distorted by the strong anisotropy and gradually approached a Gaussian distribution in the process of return to isotropy.
社団法人日本機械学会の論文
1989-09-25