三次元異方性乱流場の減衰過程に関する実験的研究

概要

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Homogeneous three dimensionally anisotropic turbulence with extremely large anisotropy was generated in a wind tunnel. Early in the return-to-isotropy process, pancake-shaped anisotropic turbulence evolved into a cigar-shaped axisymmetric one and then decayed into quasi-isotropic turbulence. The ratio of the rate of energy dissipation to that of return to isotropy, α, changed stepwise in each stage of the return-to-isotropy process. Such an aspect in the change of αwas related to the streamwise variations of the anisotropy tensor and turbulence intensity and to the restoration of energy defects in the one-dimensional spectra. The anisotropy invariant map showed that Sarkar's quadratic nonlinear model gave a better prediction for the return-to-isotropy process of turbulence with large anisotropy.
社団法人日本機械学会の論文
1995-01-25