On several occasions, freak waves have been observed in the past, some causing severe damage. In order to model such extreme wave conditions, one possibility is to use focused waves of first- or second-order based on irregular sea-state wave spectra. The wave phase is chosen such that the waves focus at a predetermined location and time, but the individual wave components become steep and start breaking before the focus location for large amplitudes. In this study, transient wave packets are used for extreme wave generation. Extreme waves are generated that are higher and only break at the concentration point using the transient wave packets method implemented in the open-source CFD model REEF3D. Model validation is performed by comparison to experimental results. The generation of wave packets with an 8.3 times shorter focus distance is investigated and the wave is replicated in a shorter domain with a 9% higher crest. The method is further used to generate a steepness induced-breaking wave and calculation of extreme wave forces on an offshore structure is demonstrated.
Extreme Wave Generation, Breaking, and Impact Simulations Using Wave Packets in REEF3D
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 17, 2017; final manuscript received November 23, 2018; published online January 17, 2019. Assoc. Editor: Yi-Hsiang Yu.
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Bihs, H., Kamath, A., Alagan Chella, M., and Arntsen, Ø. A. (January 17, 2019). "Extreme Wave Generation, Breaking, and Impact Simulations Using Wave Packets in REEF3D." ASME. J. Offshore Mech. Arct. Eng. August 2019; 141(4): 041802. https://doi.org/10.1115/1.4042178
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