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Multiphase Hele-Shaw Flows: from Beaches to Dredgers

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Liquid-particle and air-particle interactions are investigated using a Hele-Shaw cell. Firstly, Hele-Shaw experiments with beach and berm formation under driven and breaking waves will be presented. The design of this Hele-Shaw beach cell is triggered by analysing width- and depth-averaged hydrodynamic equations, such that the minimal gap width necessary for sustained wave breaking can be determined. A posteriori, the design assumptions were also validated against simulations of sloshing water waves. The steady beach morphologies observed will be discussed, including wet and dry beaches, berm or island formation, and the emergence of sandbanks. Finally, some preliminary experiments and designs will be shown, including aolean, dry `dune’ formation driven by air flow through a nonuniform channel.

This talk is part of the Institute for Energy and Environmental Flows (IEEF) series.

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