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KNSwing—On the Mooring Loads of a Ship-Like Wave Energy Converter

1
Ramboll Group A/S, Hannemanns Allé 53, DK-2300 Copenhagen S, Denmark
2
Department of Civil Engineering, Aalborg University, Thomas Manns Vej 23, 9220 Aalborg Ø, Denmark
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(2), 29; https://doi.org/10.3390/jmse7020029
Received: 10 January 2019 / Revised: 23 January 2019 / Accepted: 26 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Advances in Ocean Wave Energy Conversion)
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Abstract

The critical function of keeping a floating Wave Energy Converter in position is done by a mooring system. Several WECs have been lost due to failed moorings, indicating that extreme loads, reliability and durability are very important aspects. An understanding of the interaction between the WEC’s motion in large waves and the maximum mooring loads can be gained by investigating the system at model scale supported by numerical models. This paper describes the testing of a novel attenuator WEC design called KNSwing. It is shaped like a ship facing the waves with its bow, which results in low mooring loads and small motions in most wave conditions when the structure is longer than the waves. The concept is tested using an experimental model at scale 1:80 in regular and irregular waves, moored using rubber bands to simulate synthetic moorings. The experimental results are compared to numerical simulations done using the OrcaFlex software. The experimental results show that the WEC and the mooring system survives well, even under extreme and breaking waves. The numerical model coefficient concerning the nonlinear drag term for the surge motion is validated using decay tests. The numerical results compare well to the experiments and, thereby, the numerical model can be further used to optimize the mooring system. View Full-Text
Keywords: wave power; attenuator; mooring system; extreme load; synthetic mooring; numerical; NEMOH; OrcaFlex wave power; attenuator; mooring system; extreme load; synthetic mooring; numerical; NEMOH; OrcaFlex
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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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Nielsen, K.; Thomsen, J.B. KNSwing—On the Mooring Loads of a Ship-Like Wave Energy Converter. J. Mar. Sci. Eng. 2019, 7, 29.

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