Wave-induced seabed response around an offshore pile foundation platform

In this paper, a three-dimensional integrated numerical model including the wave and seabed sub-model is developed to investigate the wave induce seabed response around a pile foundation platform. The wave sub model is based on Volume-Averaged Reynolds-Averaged Naiver-Stokes (VARANS) equations with k-epsilon turbulence closure scheme, and the volume of fluid (VOF) method is applied to track water free surface. The seabed is treated as an isotropic and homogeneous porous medium and characterized by Biot's partly dynamic equations (u-p model). The proposed model is verified with the previous analytical results. Based on the numerical results, the distribution of flow field around pile foundation will be investigated. Then, a comprehensive comparison between a pile foundation platform model and a pile foundation without platform model will be performed to examine the effects of platform to the pile foundation. Finally, the effects of wave, pile foundation, and seabed characteristics, such as wave depth, wave height, pile diameter, pile insertion ratio, soil permeability and degree of saturation on the wave-induced seabed and pile foundation platform response will be studied.