206 波面上に発達する乱流の可視化計測(2)(OS2-2 壁乱流の計測と制御,OS2壁乱流の計測と制御)

概要

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The turbulent flow over a wavy wall was visualized and quantitatively measured with a PIV. The flow in a channel with a flat top wall and a sinusoidal bottom wall were examined. The wave length and the amplitude of the wavy wall were 32 mm and 4.5 mm, respectively. The Reynolds numbers, defined with the half channel height, was varied from 1100 to 3300. The flow separates from the wavy wall at the downstream of the crest and a recirculation region appears in the trough of the wavy wall. A large scale bursting motion out of the trough is observed. The differences of velocity profiles depending on the Reynolds number are clarified. The experimental results were compared with the previous DNS results with a wavy wall having a different wavelength-to-amplitude ratio.
2007-11-17