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Hydrodynamic characteristics of Oscillating Water Column caisson breakwaters

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  • Kuo, Yu-Shu
  • Chung, Chih-Yin
  • Hsiao, Shih-Chun
  • Wang, Yu-Kai

Abstract

This study uses the finite difference software, FLOW-3D, to develop a numerical model to simulate the hydrodynamic characteristics for Oscillating Water Column (OWC) caisson breakwaters. The numerical model is verified by a flume channel experiment for the interaction mechanism between air and water. Through the analyses with different incident wave parameters of the OWC caisson breakwaters, the following parameters are evaluated as energy capture efficiency indices: the amplitude magnification (a/a0), the air velocity at the orifice (Vori), the air oscillation pressure (Hp), the hydrodynamic efficiency (ηh), the energy produced by air for a period (Eair), and the average power produced by the air (Pair). The results show that the optimal dimensionless wavelength ratio (L/lc’) for the optimal hydrodynamic efficiency (ηh) is different from the optimal dimensionless wavelength ratio (L/lc’) for the average power produced by the air (Pair), the amplitude magnification (a/a0), the air velocity at the orifice (Vori), and the air oscillation pressure (Hp). For power generation purpose, this study suggests that the relationship curve between the dimensionless wavelength ratio (L/lc’) and the average power produced by air (Pair) can be used to determine the optimal range for wave energy capture and to design the optimal size for the OWC caisson breakwaters. Under the incident wave conditions of maximum average power produced by air, the lateral force and the base moment has enlargement phenomenon.

Suggested Citation

  • Kuo, Yu-Shu & Chung, Chih-Yin & Hsiao, Shih-Chun & Wang, Yu-Kai, 2017. "Hydrodynamic characteristics of Oscillating Water Column caisson breakwaters," Renewable Energy, Elsevier, vol. 103(C), pages 439-447.
    • Handle: RePEc:eee:renene:v:103:y:2017:i:c:p:439-447
    DOI: 10.1016/j.renene.2016.11.028
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    References listed on IDEAS

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    Cited by:

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    7. George Lavidas & Francesco De Leo & Giovanni Besio, 2020. "Blue Growth Development in the Mediterranean Sea: Quantifying the Benefits of an Integrated Wave Energy Converter at Genoa Harbour," Energies, MDPI, vol. 13(16), pages 1-14, August.
    8. Faÿ, François-Xavier & Robles, Eider & Marcos, Marga & Aldaiturriaga, Endika & Camacho, Eduardo F., 2020. "Sea trial results of a predictive algorithm at the Mutriku Wave power plant and controllers assessment based on a detailed plant model," Renewable Energy, Elsevier, vol. 146(C), pages 1725-1745.
    9. Ching-Piao Tsai & Chun-Han Ko & Ying-Chi Chen, 2018. "Investigation on Performance of a Modified Breakwater-Integrated OWC Wave Energy Converter," Sustainability, MDPI, vol. 10(3), pages 1-20, February.
    10. Çelik, Anıl & Altunkaynak, Abdüsselam, 2019. "Experimental investigations on the performance of a fixed-oscillating water column type wave energy converter," Energy, Elsevier, vol. 188(C).

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