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Effects of Swell on Wave Height Distribution of Energy-Conserved Bimodal Seas / Dominic, Reeve; Harshinie, Karunarathna

Journal of Marine Science and Engineering, Volume: 7, Issue: 3, Start page: 79

Swansesa University Authors: Dominic, Reeve, Harshinie, Karunarathna

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DOI (Published version): 10.3390/jmse7030079

Abstract

An understanding of the wave height distribution of a sea state is important in forecasting extreme wave height and lifetime fatigue predictions of marine structures. In bimodal seas, swell can be present at different percentages and different frequencies while the energy content of the sea state re...

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Published in: Journal of Marine Science and Engineering
ISSN: 2077-1312
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa49923
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Abstract: An understanding of the wave height distribution of a sea state is important in forecasting extreme wave height and lifetime fatigue predictions of marine structures. In bimodal seas, swell can be present at different percentages and different frequencies while the energy content of the sea state remains unaltered. This computational study investigates how the wave height distribution is affected by different swell percentages and long swell periods in an energy-conserved bimodal sea both near a wave maker and in shallow water. A formulated energy-conserved bimodal spectrum was created from unimodal sea states and converted into random waves time series using the Inverse Fast Fourier Transform (IFFT). The resulting time series was used to drive a Reynolds-Averaged Navier Stokes computational (RANS) model. Wave height values were then extracted from the model results (both away near and near the structure) using down-crossing analysis to inspect the non-linearity imposed by wave-wave interactions and through transformations as they propagate into shallow waters near the structure. It is concluded that the kurtosis and skewness of the wave height distribution very inversely with the swell percentage and peak periods. Non-linearities are greater in the unimodal seas compared to the bimodal seas with the same energy content. Also, non-linearities are greater structure side than at wave maker and are more dependent on the phases of the component waves at different frequencies.
Keywords: energy distribution; bimodal seas; swell percentages; IH2VOF; wave steepness; non-linearities
College: College of Engineering
Issue: 3
Start Page: 79