This paper is concerned about the high-frequency wave loads and induced ringing response of offshore wind turbine foundations exposed to steep waves. A time-domain nonlinear potential flow model based on the weak-scatterer approximation is developed. On the free surface, an arbitrary Lagrangian-Eulerian (ALE) approach is employed in the time marching process. The corresponding boundary value problem is solved by the higher-order boundary element method (HOBEM) at each time step. The proposed model is validated by comparison with the published experimental results and other numerical results. These comparisons confirm that, in respect of the wave run-up and wave loads, the present results are all in satisfactory agreement. Dynamic amplification factor of ringing response is subsequently investigated for different damping ratio and natural frequency of the structure.
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