Seabed foundation stability around offshore detached breakwaters

In this study, a three-dimensional (3D) model is adopted to investigate the problem of fluid-seabed-structure interactions (FSSI) around offshore detached breakwaters. The Volume-Averaged Reynolds-Averaged Navier-Stokes (VARANS) equations are used simulate 3D fluid motion in vicinity breakwaters, including reflected, diffracted waves and non-linear turbulence. partially dynamic Biot’s (i.e., u−p approximations) poro-elastoplastic constitutive describe fluid-seabed porous seabed. A one-way coupling algorithm established integrate seabed response. By using present model, study addresses long term cyclic loading induced response liquefaction potential loosely packed foundation. addition, effects perpendicular longshore currents on hydrodynamic properties also taken into account. numerical results reveal that loose sandy breakwaters experienced gradual decrease stiffness until occurs under successive cycles. Longshore tend exacerbate wave field increase risk foundation, especially shallow soil layer near surface.