Hydrodynamic Performance of a Floating Offshore Oscillating Water Column Wave Energy Converter
Abstract
:1. Introduction
2. Numerical Method
2.1. Computational Fluid Dynamic and Aerodynamic Wave Model
2.2. Wave-Induced Heave and Horizontal Motion
3. Numerical Results
4. Conclusions
- It was found that the frequency ratio affects the OWC with the vertical motion much more than that the OWC with the horizontal motion. The maximum efficiencies for the vertical motion and horizontal motion OWCs occur at the largest and smallest frequency ratios, respectively. At m = 2, the maximum hydraulic efficiency of horizontal motion was 0.291, found at B/L = 0.159 and = 1 and that of vertical motion was 0.270, found at B/L = 0.159 and = 10.
- The strong vertical motion of the water and OWC at small frequency ratios in the vertical motion case does not create a lot of energy, because the phase difference between the water surface motion and the OWC motion is very small, creating a very small relative motion between them.
- A mounting system’s natural frequency must be sufficiently high to provide high efficiency if the OWC oscillates vertically. However, when the OWC oscillates horizontally, the effect of its natural frequency is very weak.
- When water flows in and out of the OWC chamber, a pair of vortices with opposing directions are created near the bottom end of each OWC wall. The vortices for a horizontal motion OWC with the maximum energy occurring at = 1 are weaker than the vortices for a vertical motion OWC with the maximum energy occurring at = 10.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Mia, M.R.; Zhao, M.; Wu, H.; Dhamelia, V.; Hu, P. Hydrodynamic Performance of a Floating Offshore Oscillating Water Column Wave Energy Converter. J. Mar. Sci. Eng. 2022, 10, 1551. https://doi.org/10.3390/jmse10101551
Mia MR, Zhao M, Wu H, Dhamelia V, Hu P. Hydrodynamic Performance of a Floating Offshore Oscillating Water Column Wave Energy Converter. Journal of Marine Science and Engineering. 2022; 10(10):1551. https://doi.org/10.3390/jmse10101551
Chicago/Turabian StyleMia, Mohammad Rashed, Ming Zhao, Helen Wu, Vatsal Dhamelia, and Pan Hu. 2022. "Hydrodynamic Performance of a Floating Offshore Oscillating Water Column Wave Energy Converter" Journal of Marine Science and Engineering 10, no. 10: 1551. https://doi.org/10.3390/jmse10101551