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Impact of sloping porous seabed on the efficiency of an OWC against oblique waves

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  • Khan, Mohamin B.M.
  • Behera, Harekrushna

Abstract

The study examines the influence of a sloping porous bed on the efficiency of an oscillating water column (OWC) device facing oblique water waves. A vertical, surface piercing, thin plate near a rigid wall approximates the OWC. The system is simulated using a multi-domain boundary element method assuming the linear potential theory. The impact of varying sloping bed structural parameters and influence of the incident wave angle on the performance of the OWC is evaluated and discussed. The significance of this model to act as a breakwater protecting near-shore marine facilities is also highlighted. The OWC efficiency is found to be highly sensitive to the slope of the porous seabed, and seabed porosity is found to stabilize the resonant frequency against changes in water levels. OWCs are found to be more efficient over porous seabeds with higher frictional coefficients and lower values of porosity. The results indicate the optimum values of the sloping bottom inclination, the porosity and the frictional coefficient for the porous sloping bottom that can be used for the design and implementation of an efficient OWC device.

Suggested Citation

  • Khan, Mohamin B.M. & Behera, Harekrushna, 2021. "Impact of sloping porous seabed on the efficiency of an OWC against oblique waves," Renewable Energy, Elsevier, vol. 173(C), pages 1027-1039.
    • Handle: RePEc:eee:renene:v:173:y:2021:i:c:p:1027-1039
    DOI: 10.1016/j.renene.2021.04.046
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    References listed on IDEAS

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    1. Xu, Sheng & Wang, Shan & Guedes Soares, C., 2019. "Review of mooring design for floating wave energy converters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 111(C), pages 595-621.
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    4. Rezanejad, K. & Bhattacharjee, J. & Guedes Soares, C., 2015. "Analytical and numerical study of dual-chamber oscillating water columns on stepped bottom," Renewable Energy, Elsevier, vol. 75(C), pages 272-282.
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    Cited by:

    1. Medina Rodríguez, Ayrton Alfonso & Silva Casarín, Rodolfo & Blanco Ilzarbe, Jesús María, 2022. "The influence of oblique waves on the hydrodynamic efficiency of an onshore OWC wave energy converter," Renewable Energy, Elsevier, vol. 183(C), pages 687-707.
    2. Mayon, Robert & Ning, Dezhi & Zhang, Chongwei & Chen, Lifen & Wang, Rongquan, 2021. "Wave energy capture by an omnidirectional point sink oscillating water column system," Applied Energy, Elsevier, vol. 304(C).
    3. Naik, Nikita & Gayathri, R. & Behera, H. & Tsai, Chia-Cheng, 2023. "Wave power extraction by a dual OWC chambers over an undulated bottom," Renewable Energy, Elsevier, vol. 216(C).
    4. Cheng, Yong & Fu, Lei & Dai, Saishuai & Collu, Maurizio & Cui, Lin & Yuan, Zhiming & Incecik, Atilla, 2022. "Experimental and numerical analysis of a hybrid WEC-breakwater system combining an oscillating water column and an oscillating buoy," Renewable and Sustainable Energy Reviews, Elsevier, vol. 169(C).
    5. Mohapatra, Piyush & Vijay, K.G. & Bhattacharyya, Anirban & Sahoo, Trilochan, 2023. "Influence of distinct bottom geometries on the hydrodynamic performance of an OWC device," Energy, Elsevier, vol. 277(C).

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