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Flow patterns in a symmetrical two-dimensional wavy-walled channel were investigated at low Reynolds numbers: 10-300. In the case of steady flow, we observed a new flow structure consisting of a regular three-dimensional flow as the Reynolds number exceeds 27.5. In the case of oscillatory flow, the Reynolds number for transition from two-dimensional flow to three-dimensional flow increases with the Strouhal number.

Flow observations in a furrowed channel with arc-shaped walls for steady and oscillatory flow.