A Numerical Investigation of the Hydrodynamic Performance of a Pitch-Type Wave Energy Converter Using Weakly and Fully Nonlinear Modelsopen access
- Authors
- Poguluri, Sunny Kumar; Kim, Dongeun; Bae, Yoon Hyeok
- Issue Date
- Feb-2024
- Publisher
- Multidisciplinary Digital Publishing Institute (MDPI)
- Keywords
- absorbed power; computational fluid dynamics; coulomb type PTO load torque (one-way and two-way); nonlinear restoring moment; potential flow theory; WEC rotor
- Citation
- Energies, v.17, no.4
- Journal Title
- Energies
- Volume
- 17
- Number
- 4
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/33068
- DOI
- 10.3390/en17040898
- ISSN
- 1996-1073
1996-1073
- 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. © 2024 by the authors.
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