Theoretical Analysis of an Asymmetric Offshore-Stationary Oscillating Water Column Device with Bottom Plate
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 146, Issue 4
Abstract
To give high performance over a broader wave frequency range and enable the multipurpose utilization of marine structures, an asymmetric offshore-stationary oscillating water column device with an outstretched bottom plate is considered theoretically. Through solving boundary value problems by means of the matched eigenfunction expansion method, the effects of the geometric parameters, including drafts of the front and back walls, air chamber height and width, and length of the bottom plate, on hydrodynamic performance, such as optimum conversion efficiency (Eopt), reflection (Cr) and transmission (Ct) coefficients, radiation conductance () and susceptance (), and diffraction flux factor (), are explored in detail. The results show that a draft of d2/h = 3/8 is favorable to improve the extraction efficiency of the system. The air compressibility (increasing the chamber height) significantly influences the extraction efficiency for the intermediate- and short-wave regimes. Moreover, the presence of the bottom plate can provide another resonance mechanism, which can be tuned to provide a wider bandwidth of high performance.
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Acknowledgments
This study was partially supported by the National Natural Science Foundation of China (Grant Nos. 11702244 and 51879233), the National Key Research and Development Plan (Grant No. 2018YFB1501904), and the Joint Fund of Zhoushan City and Zhejiang University (Grant No. 2017C82223).
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 146 • Issue 4 • July 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: May 3, 2019
Accepted: Dec 6, 2019
Published online: Apr 10, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 10, 2020
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