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Offshore Measurements and Numerical Validation of the Mooring Forces on a 1:5 Scale Buoy
Uppsala University, Sweden.
Uppsala University, Sweden.
Uppsala University, Sweden; Centre of Natural Hazards and Disaster Science, Sweden.
Uppsala University, Sweden.
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2023 (English)In: Journal of Marine Science and Engineering, E-ISSN 2077-1312, Vol. 11, no 1, article id 231Article in journal (Refereed) Published
Abstract [en]

Wave energy conversion is a renewable energy technology with a promising potential. Although it has been developed for more than 200 years, the technology is still far from mature. The survivability in extreme weather conditions is a key parameter halting its development. We present here results from two weeks of measurement with a force measurement buoy deployed at Uppsala University’s test site for wave energy research at the west coast of Sweden. The collected data have been used to investigate the reliability for two typical numerical wave energy converter models: one low fidelity model based on linear wave theory and one high fidelity Reynolds-Averaged Navier–Stokes model. The line force data is also analysed by extreme value theory using the peak-over-threshold method to study the statistical distribution of extreme forces and to predict the return period. The high fidelity model shows rather good agreement for the smaller waves, but overestimates the forces for larger waves, which can be attributed to uncertainties related to field measurements and numerical modelling uncertainties. The peak-over-threshold method gives a rather satisfying result for this data set. A significant deviation is observed in the measured force for sea states with the same significant wave height. This indicates that it will be difficult to calculate the force based on the significant wave height only, which points out the importance of more offshore experiments. © 2023 by the authors.

Place, publisher, year, edition, pages
MDPI , 2023. Vol. 11, no 1, article id 231
Keywords [en]
line force, offshore measurements, point absorber, wave energy conversion
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-63991DOI: 10.3390/jmse11010231Scopus ID: 2-s2.0-85146767175OAI: oai:DiVA.org:ri-63991DiVA, id: diva2:1737161
Note

 Funding details: Vetenskapsrådet, VR, 2015-04657; Funding details: Energimyndigheten, 47264-1; Funding details: Alexander S. Onassis Public Benefit Foundation; Funding text 1: The authors would like to thank The Swedish Energy Agency for funding this project (Project no. 47264-1) within the national Swedish research program for marine energy conversion. The research in this paper was also supported by the Centre of Natural Hazards and Disaster Science (CNDS), Sweden, the Onassis Foundation, scholarship ID: F ZP 021-1/2019-2020, Swedish Research Council (grant 2015-04657), the Lars Hiertas Foundation, Wallenius Foundation, and the Bengt Ingeströms scholarship.

Available from: 2023-02-15 Created: 2023-02-15 Last updated: 2023-06-07Bibliographically approved

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Johannesson, Pär

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