Numerical wave breaking with macro-roughness

Abstract : This paper reports on a numerical investigation of solitary wave breaking over a sloping bottom covered with macro-roughness elements. Wave breaking is simulated by solving Euler equations with a two phase incompressible flow model. The hyperbolic system of the conservation laws is solved with a finite volume discretization on an unstructured grid. An artificial compressibility approach allows the use of a fully explicit scheme for an efficient parallel implementation. The numerical model is based on a low Mach number preconditioning and a second order Riemann solver. Several test cases are performed to analyze the role played by macro-roughness on the breaking dynamics. The influence of the macro-roughness elements on the solitary long wave breaking is shown to depend on two dimensionless ratios D/A and H/A, where D, H and A are the separation distances between the macro-roughness elements, the height of the elements and the wave amplitude, respectively. Significant effects are observed for large values of D/A and H/A. The successive cycles of impact/splash-ups/rebounds are strongly impaired. Three-dimensional wave breaking simulations are presented, showing the robustness of the method for modeling complex wave-structure interactions
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Journal articles
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https://hal-univ-tln.archives-ouvertes.fr/hal-00979010
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Submitted on : Tuesday, April 15, 2014 - 10:45:03 AM
Last modification on : Friday, April 5, 2019 - 8:07:55 PM

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Alioune Nar Sambe, Damien Sous, Frederic Golay, Philippe Fraunié, Richard Marcer. Numerical wave breaking with macro-roughness. European Journal of Mechanics - B/Fluids, Elsevier, 2011, 30 (6), pp.577-588. ⟨10.1016/j.euromechflu.2011.03.002⟩. ⟨hal-00979010⟩

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