乱流コヒーレント微細構造の統計的性質に関する実験的研究(乱流渦構造(2),一般講演)

概要

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To investigate fine scale structure of turbulent flows, time-resolved dual-plane stereoscopic particle image velocimetry (TRDPSPIV) has been developed. This system provides all three velocity components and nine velocity gradients with high spatial and temporal resolution. The developed system was applied to velocity measurements of a turbulent jet. From the velocity gradients, vorticity vectors, second invariant of velocity gradient tensor and energy dissipation rate are obtained exactly. These properties allow an eddy identification, which has been used in the analysis of DNS, to investigate fine scale structure of turbulence. The histograms of the diameter and maximum azimuthal velocity of the detected eddy show peaks at D/η≈10 and μ_<θ,max>/μ_κ≈0.75. These characteristics of the fine scale eddy coincide with those obtained from DNS.
日本流体力学会の論文
2007-08-06