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    Contribution to the CCP-WSI Blind Test Series 3: Analysis of scaling effects of moored point-absorber wave energy converters in a CFD-based numerical wave tank


    Windt, Christian and Ringwood, John and Davidson, Josh and Schmitt, Pál (2019) Contribution to the CCP-WSI Blind Test Series 3: Analysis of scaling effects of moored point-absorber wave energy converters in a CFD-based numerical wave tank. In: Proceedings of the Twenty-ninth (2019) International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers (ISOPE), pp. 3051-3058. ISBN 9781880653852

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    Abstract

    Computational fluid dynamics (CFD) based numerical wave tanks (NWTs) can provide valuable insight into the hydrodynamic performance of wave energy converters (WECs). Being able to capture hydrodynamic non-linearities, CFD-based NWTs (CNWTs) allow the analysis of WECs over a wide range of test conditions, such as sea states, power take-off control settings and model scale. The capabilities of a CNWT are exploited in this paper, which aims to analyse of the scaling effects of two moored point-absorber type WECs, exposed to focussed waves. To this end, three different scales are considered: 1:1, 1:10 and 1:10PWT. The latter, 1:10PWT scale, refers to the typical scale used in physical wave tanks (PWTs), complying with Froude scaling, but violating Reynolds scaling. In the 1:10 scale model, fluid viscosity is scaled, in line with the geometric properties, thereby achieving both Froude and Reynolds similitude. From the results, average differences between the three considered scales of around 5% have been observed, and the overall greatest sensitivity to scale effects can be found in the surge and pitch degree of freedom.

    Item Type: Book Section
    Additional Information: Funding: This paper is based upon work supported by Science Foundation Ireland under Grant No. 13/IA/1886. The research reported in this paper was furthermore supported by the Higher Education Excellence Program of the Ministry of Human Capacities in the frame of Water science & Disaster Prevention research area of Budapest University of Technology and Economics (BME FIKP-V´IZ). Cite as: Windt, Christian, Ringwood, John V., Davidson, Josh, and Pál Schmitt. "Contribution to the CCP-WSI Blind Test Series 3: Analysis of Scaling Effects of Moored Point-Absorber Wave Energy Converters in a CFD-Based Numerical Wave Tank." Paper presented at the The 29th International Ocean and Polar Engineering Conference, Honolulu, Hawaii, USA, June 2019.
    Keywords: Wave Energy; CCP-WSI Blind Test; Impulse wave maker; CFD; numerical wave tank; OpenFOAM; Scaling;
    Academic Unit: Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
    Faculty of Science and Engineering > Electronic Engineering
    Item ID: 14272
    Depositing User: Professor John Ringwood
    Date Deposited: 29 Mar 2021 15:50
    Publisher: International Society of Offshore and Polar Engineers (ISOPE)
    Refereed: Yes
    Funders: Science Foundation Ireland (SFI)
    URI:

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