Stagonas, D; Buldakov, E; Simons, R; (2015) Extreme wave loads on a vertical slender cylinder with and without current. In: Proceedings of the Twenty-fifth International Ocean and Polar Engineering Conference. (pp. pp. 705-710). International Society of Offshore and Polar Engineers: Kona, Hawaii, USA.

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Abstract

This paper presents results of wave flume experiments on the interaction of a vertical, slender surface piercing cylinder with extreme waves in the presence and absence of sheared currents. Following, the new-wave approach according to which a deterministic wave group represents an extreme wave in a random sea, we employ focused waves to model extreme events. Using recently introduced experimental methodologies we accurately generate steep non-linear focused waves propagating over the sheared, inline and opposing currents. One of the comparative advantages of this methodological approach is the creation of focusing wave groups with the same linearized target spectrum for all conditions investigated. The focused waves interact with a slender cylinder placed at the focus point and a phase-base separation method is used to isolate the linear, quadratic sub- and super-harmonics and high frequency third-order spectral components of the wave/wave-current induced loads. Preliminary results are presented for different target spectra and different current direction and velocity. It is shown that the current related effects on the wave-current induced loads are not only a function of the direction and the velocity of the current but also of the linearised spectrum of the focused wave. It is also shown that these effects not only refer to the linear components of the wave+current induced loads but they also extend over the higher order components. Finally, we compare wave groups with their amplitudes and phases focused at the focusing point to wave groups with their amplitudes focused near the wavemaker. The former is found to result inhigher high frequency loads.

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