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A Numerical Investigation of the Hydrodynamic Performance of a Pitch-Type Wave Energy Converter Using Weakly and Fully Nonlinear Models

Author

Listed:
  • Sunny Kumar Poguluri

    (Department of Mechanical and System Design Engineering, Hongik University, Seoul 04066, Republic of Korea)

  • Dongeun Kim

    (Multidisciplinary Graduate School Program for Wind Energy, Jeju National University, Jeju 63243, Republic of Korea)

  • Yoon Hyeok Bae

    (Department of Mechanical and System Design Engineering, Hongik University, Seoul 04066, Republic of Korea)

Abstract

In this study, the performance of a wave energy converter (WEC) rotor under regular and irregular wave conditions was investigated using 3D nonlinear numerical models. Factors such as the power take-off (PTO) load torque, wave periods, spacing of multiple WEC rotors, and wave steepness were analyzed. Two models were employed: a weakly nonlinear model formulated by incorporating the nonlinear restoring moment and Coulomb-type PTO load torque based on the potential flow theory, and a fully nonlinear model based on computational fluid dynamics. The results show that the average power estimated by both numerical models is consistent, with a wave steepness of 0.03 for the range of one-way and two-way PTO load torques, except for the deviations observed in the long range of the one-way PTO load torque. Furthermore, the average power of the WEC rotor under the applied PTO load torque exhibits a quadratic dependency, regardless of the wave steepness. In addition, adopting a one-way PTO load torque was more efficient than adopting a two-way PTO load torque. Therefore, the fully nonlinear model demonstrated its ability to handle a high degree of nonlinearity, surpassing the limitations of the weakly nonlinear model, which was limited to moderate wave steepness.

Suggested Citation

  • Sunny Kumar Poguluri & Dongeun Kim & Yoon Hyeok Bae, 2024. "A Numerical Investigation of the Hydrodynamic Performance of a Pitch-Type Wave Energy Converter Using Weakly and Fully Nonlinear Models," Energies, MDPI, vol. 17(4), pages 1-28, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:4:p:898-:d:1339023
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    References listed on IDEAS

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    1. Sheng, Wanan & Alcorn, Raymond & Lewis, Anthony, 2015. "On improving wave energy conversion, part II: Development of latching control technologies," Renewable Energy, Elsevier, vol. 75(C), pages 935-944.
    2. Haeng Sik Ko & Sangho Kim & Yoon Hyeok Bae, 2021. "Study on Optimum Power Take-Off Torque of an Asymmetric Wave Energy Converter in Western Sea of Jeju Island," Energies, MDPI, vol. 14(5), pages 1-12, March.
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