Numerical Modelling of Poro-Elastoplastic Seabed under Combined Waves and Currents

This paper presents an integrated model for the wave(current)-induced seabed response. The Reynolds-Averaged Navier-Stokers (RANS) Equations and k-e turbulence model are applied in the fluid field and the poro-elastoplastic model is used to simulate the seabed response. Validation of the present integrated model is presented first. Then the effect of currents on the seabed response is examined by considering both the oscillatory and residual mechanisms of the pore pressure inside the soil. A parametric study is conducted to examine the characteristics of the poro-elastoplastic model here. It shows that the development of the two-dimensional liquefaction zone can be illustrated by the present model. Besides, results show that opposite direction between waves and currents yields faster liquefaction process compared to the same direction.