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Skipping Stones, Ruined Roads and those Dam Oscillations

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In this talk I will describe recent results on the modelling of how the collision of an object with a moving, deformable surface can generate an apparent ``super-elastic’’ bounce. The phenomenon allows towed paddles to skip continually at high speed over water (demanding an extension of models of skipping stones) and to ``washboard’’ layers of sand or mud with only a single passage over that substrate (in contrast to the conventional explanation for washboard roads). Along the way, I will mention a related instability involving the sloshing of a fluid reservoir coupled to oscillations of a movable dam, a hydrodynamic analogue of musical instruments like the clarinet.

This talk is part of the BPI Seminar Series series.

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