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−...