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Energies 2017, 10(9), 1323; https://doi.org/10.3390/en10091323

Peak Forces on Wave Energy Linear Generators in Tsunami and Extreme Waves

1
Department of Engineering Sciences, Uppsala University, SE-752 21 Uppsala, Sweden
2
Center for Natural Disaster Science (CNDS), Villavägen 16, SE-752 36 Uppsala, Sweden
*
Author to whom correspondence should be addressed.
Received: 30 June 2017 / Revised: 8 August 2017 / Accepted: 24 August 2017 / Published: 2 September 2017
(This article belongs to the Special Issue Wave Energy Potential, Behavior and Extraction)
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Abstract

The focus of this paper is the survivability of wave energy converters (WECs) in extreme waves and tsunamis, using realistic WEC parameters. The impact of a generator damping factor has been studied, and the peak forces plotted as a function of wave height. The paper shows that an increased damping decreases the force in the endstop hit, which is in agreement with earlier studies. However, when analyzing this in more detail, we can show that friction damping and velocity dependent generator damping affect the performance of the device differently, and that friction can have a latching effect on devices in tsunami waves, leading to higher peak forces. In addition, we study the impact of different line lengths, and find that longer line lengths reduce the endstop forces in extreme regular waves, but on the contrary increase the forces in tsunami waves due to the different fluid velocity fields. View Full-Text
Keywords: wave energy; OpenFOAM; peak forces; extreme waves; tsunami; linear damping; friction wave energy; OpenFOAM; peak forces; extreme waves; tsunami; linear damping; friction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Sjökvist, L.; Göteman, M. Peak Forces on Wave Energy Linear Generators in Tsunami and Extreme Waves. Energies 2017, 10, 1323.

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