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Validation of a CFD model for wave energy system dynamics in extreme waves
Uppsala University, Sweden; Centre of Natural Hazards and Disaster Science, Sweden.
Uppsala University, Sweden.
RISE Research Institutes of Sweden, Safety and Transport, Electrification and Reliability. Aalborg University, Denmark.ORCID iD: 0000-0001-6934-634x
Sigma Energy & Marine AB, Sweden.
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2023 (English)In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 268, article id 113320Article in journal (Refereed) Published
Abstract [en]

The design of wave energy converters should rely on numerical models that are able to estimate accurately the dynamics and loads in extreme wave conditions. A high-fidelity CFD model of a 1:30 scale point-absorber is developed and validated on experimental data. This work constitutes beyond the state-of-the-art validation study as the system is subjected to 50-year return period waves. Additionally, a new methodology that addresses the well-known challenge in CFD codes of mesh deformation is successfully applied and validated. The CFD model is evaluated in different conditions: wave-only, free decay, and wave–structure interaction. The results show that the extreme waves and the experimental setup of the wave energy converter are simulated within an accuracy of 2%. The developed high-fidelity model is able to capture the motion of the system and the force in the mooring line under extreme waves with satisfactory accuracy. The deviation between the numerical and corresponding experimental RAOs is lower than 7% for waves with smaller steepness. In higher waves, the deviation increases up to 10% due to the inevitable wave reflections and complex dynamics. The pitch motion presents a larger deviation, however, the pitch is of secondary importance for a point-absorber wave energy converter. © 2022 The Author(s)

Place, publisher, year, edition, pages
Elsevier Ltd , 2023. Vol. 268, article id 113320
Keywords [en]
CFD, Extreme waves, OpenFOAM, Point-absorber, Validation model, Wave energy, Mooring, Mooring cables, CFD-model, Energy systems, Point absorber, System Dynamics, Wave conditions, Wave energy converters, Wave energy conversion
National Category
Marine Engineering
Identifiers
URN: urn:nbn:se:ri:diva-62361DOI: 10.1016/j.oceaneng.2022.113320Scopus ID: 2-s2.0-85144021092OAI: oai:DiVA.org:ri-62361DiVA, id: diva2:1730042
Note

Funding details: 47264-1; Funding details: Centrum för naturkatastrofslära, Uppsala Universitet, CNDS; Funding details: Vetenskapsrådet, VR, 2015-04657; Funding details: Alexander S. Onassis Public Benefit Foundation; Funding text 1: The research in this paper was supported by the Centre of Natural Hazards and Disaster Science , Sweden, the Swedish Research Council (VR, grant number 2015-04657) , the Swedish Energy Authority (project number 47264-1 ). This scientific paper was also supported by the Onassis Foundation , scholarship ID: F ZP 021-1/2019-2020 . The CFD simulations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC) at the HPC cluster: Tetralith at the National Supercomputer Centre, Linköping University. All authors have read and agreed to the published version of the manuscript.

Available from: 2023-01-23 Created: 2023-01-23 Last updated: 2023-05-16Bibliographically approved

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