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Shape optimization design of a heaving buoy of wave energy converter based on fully parametric modeling and CFD method

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Abstract

The hydrodynamic shape of the heaving buoy is an important factor of the motion response in waves and thus concerns the energy conversion efficiency for the point absorbers (PAs). The current experience-based designs are time consuming and not very efficient, hence, faster and smarter methods are desirable. An automated optimization method based on a fully parametric modeling method and computational fluid dynamics (CFD), is proposed in this paper. Using this method, a benchmark buoy is screen designed and then optimized by maximizing the heave motion response. The geometry is described parametrically and deformed by means of the free-form deformation (FFD) method. During the optimization process, the expansion factor of control points is the basis for the variations. A combination of the Sobol and the non-dominated sorting genetic algorithm II (NSGA-II) is used to search for the solutions. After several iterations, the heaving buoy shape with optimal heave motion response is obtained. The analyses show that the heave motion response has increased 55.3% after optimization. The developed methodology is valid and seems to be a promising way to design a novel buoy that can significantly improve the wave energy conversion efficiency of the PAs in future.

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Acknowledgements

This work was supported by the Key Area Research and Development Program of Guangdong Province (Grant Nos. 2021B0101200002, 2021B0202070002), the Natural Science Foundation of Guangdong Province (Grant Nos. 2022A1515011285, 2021A1515011771) and Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (Grant No. SML2022008).

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Authors and Affiliations

  1. School of Ocean Engineering and Technology, Sun Yat-sen University & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China

    Shuo Huang, Wei-qi Liu, Kai Wang, Tie-cheng Wu & Tian-hui Liu

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  1. Shuo Huang
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  2. Wei-qi Liu
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  3. Kai Wang
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  4. Tie-cheng Wu
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  5. Tian-hui Liu
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Correspondence to Kai Wang.

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Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors.

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Conflict of Interest: The authors declare that they have no conflict of interest.

Informed consent: Informed consent was obtained from all individual participants included in the study.

Project supported by the National Natural Science Foundation of China (Grant No. 52271301).

Biography: Shuo Huang (1984-), Female, Ph. D., Associate Professor

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Huang, S., Liu, Wq., Wang, K. et al. Shape optimization design of a heaving buoy of wave energy converter based on fully parametric modeling and CFD method. J Hydrodyn 34, 1081–1094 (2022). https://doi.org/10.1007/s42241-022-0080-x

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  • DOI: https://doi.org/10.1007/s42241-022-0080-x

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