An investigation on the interaction between extreme waves and monopile support structures is presented. A time-domain nonlinear potential flow model is developed based on the weak-scatterer approximation. On the free surface, the fourth-order Runge-Kutta scheme with an arbitrary Lagrangian-Eulerian approach is adopted in the time-marching process. The corresponding boundary value problem is solved by the higher-order boundary element method at each time step. A comparative study has been performed to investigate the interaction of steep focused wave groups with a fixed vertical cylinder. The present numerical results of wave elevations and dynamic pressures recorded at different positions are provided and compared with the experimental data. Then the wave runup and inline force are analyzed in the time-frequency domain based on wavelet transforms.
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