Three-dimensional modeling of wave-structure-seabed interaction around twin-pile group

In this paper, a preliminary study of wave-induced oscillatory seabed response around twin-pile group is performed using a three-dimensional (3D) model, and meanwhile comparative analysis with mono-pile is conducted. In the proposed model, Reynolds-Averaged Navier-Stokes (RANS) equations with k−ε turbulence model is applied to simulate the wave motion, while Biot's poro-elastic theory for the porous seabed is employed to govern the seabed response. Validation against available experiment data and analytical solution demonstrates that the present model has the capacity of simulating wave-structure-seabed interaction (WSSI) around pile structures. Results show that magnitudes of wave-induced oscillatory pore pressure and liquefaction depth around twin-pile group tend to attenuate along the pile-pile centerline, presenting significant difference from that around mono-pile.