Abstract
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 500 to 3000. 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 for the higher Reynolds number case. The differences of velocity profiles depending on the Reynolds number are clarified.
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