軸対称異方性乱流場の実験的解析 : 第4報,軸対称乱流の等方化モデルの検証

概要

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Homogeneous cigar-shaped axisymmetric turbulence fields with different degrees of anisotropy were analyzed in terms of the anisotropy tensor and its invariants. The process of their return to isotropy was compared with that of pancake-shaped axisymmetric turbulence fields. The ratio of the characteristic time-scale of the return to isotropy to that of the decay of turbulence energy was strongly dependent on the magnitude of invariant II and was related to the streamwise evolution of the spectrum. The Rotta's constant varied discontinuously as the invariant II changed downstream. Anisotropies characterized by integral scale and microscale ratios were very large at the initial stage of the decay. The microscale anisotropy decreased monotonously, but the integral scale anisotropy became smaller very rapidly at first and then gradually grew larger as invariant II decreased downstream.
社団法人日本機械学会の論文
1989-09-25