Numerical investigation of non-cohesive seabed response around a mono-pile by crossing wave-current

Abstract

The interaction between waves and currents in the ocean often complicates the flow field around structures. In this study, a three-dimensional integrated numerical model was established to investigate the seabed response and liquefaction around a mono-pile under different wave–current interaction angles. In the present model, the Reynolds-averaged Navier–Stokes equations were used to simulate the flow field, and the Biot's poro-elastic theory was adopted to calculate the seabed response caused by crossing wave-current loading. Unlike previous studies, the load on the mono-pile was considered, and the wave–current interaction angle was extended to 180°, which was more in line with practical engineering problems. The numerical results were in a good agreement with the experimental measurements. The results indicated that waves interacted with currents in a large angle could result in a large momentary liquefaction depth of the seabed. The parametric studies proved that the position of the front and two sides of the pile was relatively safer compared with that of the leeside of the pile, and the surface of the seabed downstream of the pile was liable to liquefy.