Experimental study of simultaneous measurement of velocity and surface topography: in the wake of a circular cylinder at low Reynolds number
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A technique to provide simultaneous measurement on both free surface topography and the velocity vector field of free surface flows is further developed and validated. Testing was performed on the topography measurement by imaging static plastic wave samples over a wide range of amplitudes. Analysis on the accuracy of the topography reconstruction, the sensitivity to noise and the dependence on spatial resolution are presented. The displacement of the free surface is insensitive to noisy input and the sensitivity shows a linear dependence with the sample spacing. Simultaneous measurements of the free surface and associated velocity field in the wake of a circular cylinder are presented for Reynolds numbers between 55 and 100.
KeywordsSurface Topography Splitter Plate Velocity Vector Field Surface Gradient Optical Distortion
The authors gratefully acknowledge the support from an Australian Research Council Discovery Grant (DP0877327).
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