Sliding of caisson submitted to water wedge impact: analytical calculation and CFD verifications

摘要

In this work, the impulsive stage of a wave impact on a vertical breakwateris modelled based on the analogy with a water wedge impact. Couplingbetween pressure along the wall and caisson displacement is neglected.The aim of the present paper is to briefly present the method andverify the uncoupling hypothesis using Navier-Stokes numerical simulations.The water wedge analogy allows us first to analyse the influence ofthe wedge interface inclination (45◦, 60◦ and 80◦) on the sliding. Consideringan ideal case without friction and uplift force, caisson slidingmotion is found to decrease with wedge angle. Conversely, the velocityacquired by the caisson increases with the wedge inclination. In the45◦ case, we show that the sliding simulated with a Navier-Stokes modeltaking into account the flow/structure coupling is finally close to the oneestimated with the analytical method developed in this study, thereforevalidating the decoupling hypothesis.