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Wave-body interactions among energy absorbers in a wave farm

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  • Zhong, Qian
  • Yeung, Ronald W.

Abstract

A semi-analytical method is developed to investigate surface-wave interactions among an array of wave-energy converters, each modeled as a truncated cylinder, and the interaction effects on power absorption from the array is studied. Each cylinder can have independent movements with six degrees of freedom. The method of matched eigen-function expansions is applied to solve the wave radiation problem. To achieve fast computation, effects of evanescent modes of local scattering waves from one cylinder is neglected in the near fields of neighboring cylinders, but the far-field radiated waves are retained. Wave-exciting forces and moments on an individual cylinder or a group of cylinders, situated among an array, are evaluated by a new, generalized form of the “Haskind relation” applicable to an array of arbitrary configuration, which only requires the solution to the radiation problem. Hydrodynamic properties and wave-exciting loads are presented for arrays of different configurations. This efficient computation facilitates investigating wave-interaction effects on the optimal power output of a cylinder array. Effects of the cylinder numbers, their spacing, and the layout geometry on power extraction are discussed. The interaction factor for a large wave farm consisting of multiple small arrays was evaluated by the current method combined with the point-absorber approximation.

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  • Zhong, Qian & Yeung, Ronald W., 2019. "Wave-body interactions among energy absorbers in a wave farm," Applied Energy, Elsevier, vol. 233, pages 1051-1064.
    • Handle: RePEc:eee:appene:v:233-234:y:2019:i::p:1051-1064
    DOI: 10.1016/j.apenergy.2018.09.131
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    6. Dezhi Ning & Zechen He & Ying Gou & Malin Göteman, 2019. "Near Trapping Effect on Wave-Power Extraction by Linear Periodic Arrays," Sustainability, MDPI, vol. 12(1), pages 1-17, December.
    7. 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).
    8. Zheng, Siming & Zhang, Yongliang & Iglesias, Gregorio, 2020. "Power capture performance of hybrid wave farms combining different wave energy conversion technologies: The H-factor," Energy, Elsevier, vol. 204(C).
    9. Carrelhas, A.A.D. & Gato, L.M.C. & Falcão, A.F.O. & Henriques, J.C.C., 2022. "Control law design for the air-turbine-generator set of a fully submerged 1.5 MW mWave prototype. Part 1: Numerical modelling," Renewable Energy, Elsevier, vol. 181(C), pages 1402-1418.
    10. Han, Meng & Cao, Feifei & Shi, Hongda & Zhu, Kai & Dong, Xiaochen & Li, Demin, 2023. "Layout optimisation of the two-body heaving wave energy converter array," Renewable Energy, Elsevier, vol. 205(C), pages 410-431.
    11. Iida, Takahito, 2023. "Decomposition and prediction of initial uniform bi-directional water waves using an array of wave-rider buoys," Renewable Energy, Elsevier, vol. 217(C).

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