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research-article

EXTREME WAVE GENERATION, BREAKING AND IMPACT SIMULATIONS USING WAVE PACKETS IN REEF3D

[+] Author and Article Information
Hans Bihs

Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, NTNU Trondheim, Norway
hans.bihs@ntnu.no

Arun Kamath

Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, NTNU Trondheim, Norway
arun.kamath@ntnu.no

Mayilvahanan Alagan Chella

Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, NTNU Trondheim, Norway
acm@ntnu.no

Øivind Asgeir Arntsen

Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, NTNU Trondheim, Norway
oivind.arntsen@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4042178 History: Received July 17, 2017; Revised November 23, 2018

Abstract

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.

Copyright (c) 2018 by ASME
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