Author(s): Vincent H. Chu; Boyuan Yu

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Keywords: Wave Force; Roll Waves; Numerical Simulation

Abstract: Roll waves are fast-moving instabilities in open-channel flow on a steep slope. They are steep wavefronts advancing with speed greater than the velocity of their base flow. We examine the impact of the front runner of the roll waves on a circular cylinder using an accurate shock-capture scheme on an adaptive quadtree mesh for the transient development of the waves, including the standoff distance of the bow shock wave, the front face's run-up height, and its impact force on the obstacle. Depending on the base-flow Froude number and the obstacle's location, the peak of the wave impact force can be more than one order of magnitude greater than the steady force in the unperturbed base flow.

DOI: https://doi.org/10.3850/IAHR-39WC2521711920221273

Year: 2022