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RANS-VOF modelling of the Wavestar point absorber

Author

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  • Ransley, E.J.
  • Greaves, D.M.
  • Raby, A.
  • Simmonds, D.
  • Jakobsen, M.M.
  • Kramer, M.

Abstract

Numerical modelling has become commonplace in the development of offshore structures, however for dynamic systems such as Wave Energy Convertors (WECs) conventional numerical tools may not be able to capture the full range of behaviours required for engineering analysis. This is particularly problematic in extreme seas where the nonlinearities and coupled nature of these systems become important. In this work a fully nonlinear, coupled tool for simulation of WECs is produced and compare with physical measurements. Regular wave interactions with both a fixed and freely-pitching, 1:10 scale model of the Wavestar are reproduced numerically. The numerical model is shown to be capable of predicting the pressure on the float's surface and the fully coupled motion of the device. However, the results indicate that the higher-order free surface behaviour in the vicinity of the device is not being captured correctly. Finally, the numerical model is shown to cope with an extreme regular wave including large amplitude motion, full submersion and high levels of free surface distortion. The results presented suggest that the quality of the numerical reproduction does not decrease with wave steepness; however the execution time of simulations increases significantly with increased float oscillation.

Suggested Citation

  • Ransley, E.J. & Greaves, D.M. & Raby, A. & Simmonds, D. & Jakobsen, M.M. & Kramer, M., 2017. "RANS-VOF modelling of the Wavestar point absorber," Renewable Energy, Elsevier, vol. 109(C), pages 49-65.
    • Handle: RePEc:eee:renene:v:109:y:2017:i:c:p:49-65
    DOI: 10.1016/j.renene.2017.02.079
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    References listed on IDEAS

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    1. Agamloh, Emmanuel B. & Wallace, Alan K. & von Jouanne, Annette, 2008. "Application of fluid–structure interaction simulation of an ocean wave energy extraction device," Renewable Energy, Elsevier, vol. 33(4), pages 748-757.
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    2. Cui, Lin & Zheng, Siming & Zhang, Yongliang & Miles, Jon & Iglesias, Gregorio, 2021. "Wave power extraction from a hybrid oscillating water column-oscillating buoy wave energy converter," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    3. Luan, Zhengxiao & Chen, Bangqi & Jin, Ruijia & He, Guanghua & Ghassemi, Hassan & Jing, Penglin, 2024. "Validation of a numerical wave tank based on overset mesh for the wavestar-like wave energy converter in the South China Sea," Energy, Elsevier, vol. 290(C).
    4. Zheng, Siming & Zhang, Yongliang & Iglesias, Gregorio, 2020. "Concept and performance of a novel wave energy converter: Variable Aperture Point-Absorber (VAPA)," Renewable Energy, Elsevier, vol. 153(C), pages 681-700.
    5. Windt, Christian & Davidson, Josh & Ransley, Edward J. & Greaves, Deborah & Jakobsen, Morten & Kramer, Morten & Ringwood, John V., 2020. "Validation of a CFD-based numerical wave tank model for the power production assessment of the wavestar ocean wave energy converter," Renewable Energy, Elsevier, vol. 146(C), pages 2499-2516.
    6. Mohd Afifi Jusoh & Mohd Zamri Ibrahim & Muhamad Zalani Daud & Zulkifli Mohd Yusop & Aliashim Albani, 2020. "An Estimation of Hydraulic Power Take-off Unit Parameters for Wave Energy Converter Device Using Non-Evolutionary NLPQL and Evolutionary GA Approaches," Energies, MDPI, vol. 14(1), pages 1-26, December.
    7. Santo, H. & Taylor, P.H. & Stansby, P.K., 2020. "The performance of the three-float M4 wave energy converter off Albany, on the south coast of western Australia, compared to Orkney (EMEC) in the U.K," Renewable Energy, Elsevier, vol. 146(C), pages 444-459.
    8. Brecht Devolder & Vasiliki Stratigaki & Peter Troch & Pieter Rauwoens, 2018. "CFD Simulations of Floating Point Absorber Wave Energy Converter Arrays Subjected to Regular Waves," Energies, MDPI, vol. 11(3), pages 1-23, March.
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    11. Zhang, Yongxing & Zhao, Yongjie & Sun, Wei & Li, Jiaxuan, 2021. "Ocean wave energy converters: Technical principle, device realization, and performance evaluation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    12. Masoomi, Mobin & Sarlak, Hamid & Rezanejad, Kourosh, 2023. "Hydrodynamic performance analysis of a new hybrid wave energy converter system using OpenFOAM," Energy, Elsevier, vol. 269(C).
    13. Sjökvist, Linnea & Göteman, Malin, 2019. "Peak forces on a point absorbing wave energy converter impacted by tsunami waves," Renewable Energy, Elsevier, vol. 133(C), pages 1024-1033.
    14. Zhu, Kai & Cao, Feifei & Wang, Tianyuan & Tao, Ji & Wei, Zhiwen & Shi, Hongda, 2024. "A comparative investigation into the dynamic performance of multiple wind-wave hybrid systems utilizing a full-process analytical model," Applied Energy, Elsevier, vol. 360(C).
    15. Hua Liu & Weijun Wang & Shuai Tang & Longbo Mao & Hongju Mi & Guoping Zhang & Jun Liu, 2019. "Reliability Assessment of Water Hydraulic-Drive Wave-Energy Converters," Energies, MDPI, vol. 12(21), pages 1-21, November.
    16. Rosa-Santos, Paulo & Taveira-Pinto, Francisco & Rodríguez, Claudio A. & Ramos, Victor & López, Mario, 2019. "The CECO wave energy converter: Recent developments," Renewable Energy, Elsevier, vol. 139(C), pages 368-384.
    17. Penalba, Markel & Davidson, Josh & Windt, Christian & Ringwood, John V., 2018. "A high-fidelity wave-to-wire simulation platform for wave energy converters: Coupled numerical wave tank and power take-off models," Applied Energy, Elsevier, vol. 226(C), pages 655-669.
    18. Linnea Sjökvist & Malin Göteman, 2017. "Peak Forces on Wave Energy Linear Generators in Tsunami and Extreme Waves," Energies, MDPI, vol. 10(9), pages 1-19, September.

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