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Hydrodynamic performance characteristics of an oscillating water column device integrated with a pile breakwater

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Abstract

The hydrodynamic performance characteristics of an oscillating water column (OWC) device mounted on a pile-supported breakwater (OWC-PSB) exposed to action of regular and random waves is investigated. The results are compared with that of a vertical wall type pile-supported breakwater (VW-PSB). The experiments were carried out in a wave flume in a constant water depth of 0.95 m covering intermediate to deepwater conditions. The wave energy transmission past both models is found to be similar under deepwater conditions, and marginally less for OWC-PSB in intermediate water depths. The OWC-PSB model exhibited less wave reflection for most of the tests. Since a part of incident wave energy is converted to water column oscillations inside the OWC chamber, the energy dissipation co-efficient for OWC-PSB is more than that for VW-PSB. The wave amplification factor for the OWC device is higher for long waves; however, the hydrodynamic efficiency is higher for high-frequency waves with the efficiency being a maximum close to 50% under deepwater conditions.

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Acknowledgements

This work was supported by the Ministry of Shipping, Government of India (Grant no. S2-25021/2/2017-SM).

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This work was supported by the Ministry of Shipping, Government of India (Grant no. S2-25021/2/2017-SM).

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Correspondence to V. Sundar.

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Karthik Ramnarayan, S., Sundar, V. & Sannasiraj, S.A. Hydrodynamic performance characteristics of an oscillating water column device integrated with a pile breakwater. J. Ocean Eng. Mar. Energy 7, 229–241 (2021). https://doi.org/10.1007/s40722-021-00199-7

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