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Simulations numériques de l'action de la houle sur des ouvrages marins dans des conditions hydrodynamiques sévères

Abstract : The present manuscript focuses on the wave impact on a rigid wall in two dimensions. The numerical computations were performed using a Smoothed Particle Hydrodynamics (SPH) software named JOSEPHINE, developed at the LOMC laboratory. The software is based on a weakly-compressible SPH model, where Euler equation of motion is solved. Firstly, an academic test case, the impact of a triangular jet was used to validate and improve the numerical scheme to model violent impacts.The impact pressures were studied and compared to analytical and other numerical results. Secondly, the impact of a breaking solitary wave was modelled.The impact pressures were determined and compared with those obtained in the experiments. After a depth numerical analysis of mono-phase flow computations, a two-phase model was developed specifically to consider both water and air phases. The two-phase SPH model improved the results quality, especially for the case "air pocket impact", where an air pocket is trapped during the impact. The ultimate goal of this work is to study the survivability of coastal structures equipped with a marine energy recovery device during severe weather events.
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Xuezhou Lu. Simulations numériques de l'action de la houle sur des ouvrages marins dans des conditions hydrodynamiques sévères. Mécanique [physics]. Université du Havre, 2016. Français. ⟨NNT : 2016LEHA0012⟩. ⟨tel-01461313⟩

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