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Energy balance analysis method in oscillating type wave converter

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Abstract

Based on an efficient potential flow wave model to simulate the oscillating water column (OWC) wave fields, this research further develops the solutions using higher index terms in the wave potential. This effort together with a linear damping correction significantly improves the free surface elevation correlation between the potential model predictions and the model test measurements. In addition, a method to establish conservation of energy within the incident, diffracted, and radiated wave energy flux is introduced. The method uses the gradient of wave phase to efficiently determine the propagating direction of a small element of wave in the wave field. By integrating over the control boundary, this research provides the energy balance for diffraction-only case and diffraction-radiation combined case. Discussions about the influence of different parameters on the energy extraction from the wave field demonstrate the effective application of the method in optimizing wave energy converters utilizing oscillations induced by 3-D wave field.

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Acknowledgements

The authors would like to acknowledge the Marine Dynamics Laboratory at Texas A&M University: Dr. Somayajula, Dr. Guha, Mr. Liu, and Mr. Zhi for their inspirations to this research. Prof. Evans and Dr. Porter from the University of Bristol have done excellent work in solving the potential flow model used in the paper and Mr. Garriga has provided important experimental data, which both give us great support in this work.

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Authors and Affiliations

  1. Department of Ocean Engineering, Texas A&M University, College Station, TX, USA

    Hao Wang & Jeffrey Falzarano

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  1. Hao Wang
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  2. Jeffrey Falzarano
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Correspondence to Hao Wang.

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Wang, H., Falzarano, J. Energy balance analysis method in oscillating type wave converter. J. Ocean Eng. Mar. Energy 3, 193–208 (2017). https://doi.org/10.1007/s40722-017-0081-y

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  • DOI: https://doi.org/10.1007/s40722-017-0081-y

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