Abstract
An integrated numerical model is developed to study wave and current-induced seabed response and liquefaction in a flat seabed. The velocity-inlet wave-generating method is adopted in the present study and the finite difference method is employed to solve the Reynolds-averaged Navier-Stokes equations with k-ε turbulence closure. The model validation demonstrates the capacity of the present model. The parametrical study reveals that the increase of current velocity tends to elongate the wave trough and alleviate the corresponding suction force on the seabed, leading to a decrease in liquefaction depth, while the width of the liquefaction area is enlarged simultaneously. This goes against previous studies, which ignored fluid viscosity, turbulence and bed friction.
Highlights
Water waves and currents coexist in the ocean environment, and are major loads acting on the seabed and offshore structures
For wave–current interactions, the analytical solution of Hsu et al [10], based on potential flow theory, is widely used, and computational fluid dynamics (CFD) methods are employed by some researchers
The oscillatory seabed response to combined wave and current loading is numerically explored in this paper
Summary
Water waves and currents coexist in the ocean environment, and are major loads acting on the seabed and offshore structures. In the existing research on WCSI, numerical and analytical methods have been widely adopted to study wave and current-induced seabed responses. For wave–current interactions, the analytical solution of Hsu et al [10], based on potential flow theory, is widely used, and computational fluid dynamics (CFD) methods are employed by some researchers. The inertia effects of both soil skeleton and pore fluid are excluded in QS model, and both are included in the u-w model. In u-p approximation, the inertia effect of pore fluid is ignored. Based on the results of Ulker et al [11] and Cheng and Liu [12], Sumer [5] summarized that, for most engineering problems, both inertia effects could be neglected, when involving fine sediments (silt and fine sand) or dealing with liquefaction processes. When excessive pore pressure overcomes the self-weight of seabed soil, seabed liquefaction may occur
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