Abstract
The diffraction of wave groups with a large offshore structure has been considered using the perturbation method of multiple scales. Second-order slowly-varying wave forces arising from such diffraction are then evaluated numerically for two types of incident wave envelope; one is the soliton envelope that is stable for the relative depth kh>1.36, while the other assumes simply sinusoidal profile. The numerical results for low-frequency wave force coefficients are presented for a circular and a rectangular cylinder and for a conical structure. It will be shown that the low-frequency wave forces become increasingly important in estimating the total wave forces as the value of kh decreases and as the value of diffraction parameter increases.
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