高解像度Dual-Plane Stereoscopic PIVによる乱流コヒーレント微細構造の計測(乱流基礎(4),一般講演)

概要

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To investigate fine scale structure of turbulent flows, high resolution dual-plane stereoscopic PIV system was applied to velocity measurements of a turbulent jet. This system provides all three velocity components and nine velocity gradients with high spatial resolution (2.8η×2.8η×4.1η). 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 direct numerical simulation (DNS). The probability density functions (pdf) of the diameter and maximum azimuthal velocity of the detected eddy show peaks at D/η≈8 and u_<θ.max>/u_κ≈1. These characteristics of the fine scale eddy coincide with those obtained from DNS.
日本流体力学会の論文
2008-09-04