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In this paper, the interaction of a tsunami and a quay wall is studied numerically with focus on the water volume flooding the downstream part of the quay. The model solves the Navier-Stokes equations using the VOF method. It is first validated on two cases close to the study configuration. Then flooding discharge are calculated considering two wave inputs (solitary wave, break flow over wet bottom) and increasing amplitudes. The differences are significant. The solitary wave give a short duration flooding due to its dependency between amplitude and frequency. The dam break flow produces flooding bursts followed by a steady residual flooding which may be the parameter of importance in this problem. [ABSTRACT FROM AUTHOR]

In this work, the impulsive stage of a wave impact on a vertical breakwater is modelled based on the analogy with a water wedge impact. Coupling between pressure along the wall and caisson displacement is neglected. The aim of the present paper is to briefly present the method and verify the uncoupling hypothesis using Navier-Stokes numerical simulations. The water wedge analogy allows us first to analyse the influence of the wedge interface inclination (45°, 60° and 80°) on the sliding. Considering an ideal case without friction and uplift force, caisson sliding motion is found to decrease with wedge angle. Conversely, the velocity acquired by the caisson increases with the wedge inclination. In the 45° case, we show that the sliding simulated with a Navier-Stokes model taking into account the flow/structure coupling is finally close to the one estimated with the analytical method developed in this study, therefore validating the decoupling hypothesis. [ABSTRACT FROM AUTHOR]