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Fully nonlinear analysis incorporating viscous effects for hydrodynamics of an oscillating wave surge converter with nonlinear power take-off system

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  • Cheng, Yong
  • Ji, Chunyan
  • Zhai, Gangjun

Abstract

WaveRoller can be classified as an effective Oscillating wave surge converter (OWSC) installed in nearshore coastal areas. In this study, the hydrodynamic performance of a two-dimensional (2-D) WaveRoller is investigated based on a fully nonlinear time-domain higher-order boundary element method (HOBEM). The mechanism through which the wave power is extracted, is analyzed in a nonlinear power take-off (PTO) by coupling the time-varying motion of the flap and hydro-electric generator. A simplified Morison model is used to determine the viscosity term in the structural motion equation. The present model is validated against the published experimental and numerical results for an OWSC with its top edge piercing through the water surface. Numerical simulations are undertaken to investigate the mechanism of the nonlinear phenomenon including wave nonlinearity and PTO nonlinearity. The influence of the viscosity is also quantified by comparing the numerical results with and without the quadratic damping term. Numerical results indicate that when the incident wave amplitude is large, the capture efficiency is reduced by the strengthen higher order free wave components, and the PTO nonlinearity becomes more prominent. Furthermore, the maximum discrepancy induced by the viscosity occurs in the resonant zone.

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  • Cheng, Yong & Ji, Chunyan & Zhai, Gangjun, 2019. "Fully nonlinear analysis incorporating viscous effects for hydrodynamics of an oscillating wave surge converter with nonlinear power take-off system," Energy, Elsevier, vol. 179(C), pages 1067-1081.
    • Handle: RePEc:eee:energy:v:179:y:2019:i:c:p:1067-1081
    DOI: 10.1016/j.energy.2019.04.189
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    References listed on IDEAS

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    Cited by:

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    2. Arguilé-Pérez, B. & Ribeiro, A.S. & Costoya, X. & deCastro, M. & Gómez-Gesteira, M., 2023. "Suitability of wave energy converters in northwestern Spain under the near future winter wave climate," Energy, Elsevier, vol. 278(PB).
    3. Cheng, Yong & Xi, Chen & Dai, Saishuai & Ji, Chunyan & Cocard, Margot & Yuan, Zhiming & Incecik, Atilla, 2021. "Performance characteristics and parametric analysis of a novel multi-purpose platform combining a moonpool-type floating breakwater and an array of wave energy converters," Applied Energy, Elsevier, vol. 292(C).
    4. Cheng, Yong & Xi, Chen & Dai, Saishuai & Ji, Chunyan & Cocard, Margot, 2021. "Wave energy extraction for an array of dual-oscillating wave surge converter with different layouts," Applied Energy, Elsevier, vol. 292(C).
    5. Cheng, Yong & Li, Gen & Ji, Chunyan & Fan, Tianhui & Zhai, Gangjun, 2020. "Fully nonlinear investigations on performance of an OWSC (oscillating wave surge converter) in 3D (three-dimensional) open water," Energy, Elsevier, vol. 210(C).
    6. Wang, Yize & Liu, Zhenqing, 2021. "Proposal of novel analytical wake model and GPU-accelerated array optimization method for oscillating wave surge energy converter," Renewable Energy, Elsevier, vol. 179(C), pages 563-583.

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