Abstract
The turbulent flow over a wavy wall was quantitatively measured with a time-series PIV. The test section is consisted of a flat wall and a wavy wall. The wave length and the amplitude of the wavy wall are 32 mm and 4.5 mm, respectively. The Reynolds number, defined with the half channel height, was varied from 550 to 3300. Distribution of time-averaged velocity vector, turbulent intensities and Reynolds shear stress are obtained. A two-point correlation of velocity components is estimated in order to show coherent structure. The flow separates from the wavy wall at the upstream of the trough and reattaches at the downstream of the trough. A recirculation region appears in the trough of the wavy wall. A bursting motion out of the trough is observed. Features of wavy wall turbulence are clarified.
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