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Nonlinear 2D analysis of the efficiency of fixed Oscillating Water Column wave energy converters

Author

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  • Luo, Yongyao
  • Nader, Jean-Roch
  • Cooper, Paul
  • Zhu, Song-Ping

Abstract

This paper reports on the development of a two-dimensional, fully nonlinear Computational Fluid Dynamics (CFD) model to analyse the efficiency of fixed Oscillating Water Column (OWC) Wave Energy Conversion (WEC) devices with linear power take off systems. The model was validated against previous experimental, analytical and numerical results of others. In particular, the simulation results show excellent agreement with the analytical results obtained by Sarmento and Falcão [1] for linear waves in a 2D channel and with previous experiments by others on the interaction between nonlinear waves and a fixed barge. Results are presented for linear waves on the influence of the seaward wall draft and thickness of the OWC device on the resonant frequency and the capture efficiency of the OWC. The key outcome of the present work is that for fully nonlinear waves a substantial decrease in the hydrodynamic capture efficiency of the OWC device was observed with increasing wave height, which represents a significant departure from the linear wave case. The optimal pneumatic damping coefficient for the OWC was also found to be dependent on the wave height. By analysing the magnitude of the first and higher order components of the incident nonlinear waves and the response of the OWC it was found that the first order capture efficiency decreases with increasing wave height, which in turn implies that the OWC hydrodynamic system is fully nonlinear and that the behaviour of an OWC in a nonlinear wave train cannot be accurately represented by the superposition of the linear response to a number of component linear waves. These results have significant implications for the design and operation of practical OWC systems.

Suggested Citation

  • Luo, Yongyao & Nader, Jean-Roch & Cooper, Paul & Zhu, Song-Ping, 2014. "Nonlinear 2D analysis of the efficiency of fixed Oscillating Water Column wave energy converters," Renewable Energy, Elsevier, vol. 64(C), pages 255-265.
    • Handle: RePEc:eee:renene:v:64:y:2014:i:c:p:255-265
    DOI: 10.1016/j.renene.2013.11.007
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    References listed on IDEAS

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    1. Clément, Alain & McCullen, Pat & Falcão, António & Fiorentino, Antonio & Gardner, Fred & Hammarlund, Karin & Lemonis, George & Lewis, Tony & Nielsen, Kim & Petroncini, Simona & Pontes, M. -Teresa & Sc, 2002. "Wave energy in Europe: current status and perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 6(5), pages 405-431, October.
    2. Gomes, R.P.F. & Henriques, J.C.C. & Gato, L.M.C. & Falcão, A.F.O., 2012. "Hydrodynamic optimization of an axisymmetric floating oscillating water column for wave energy conversion," Renewable Energy, Elsevier, vol. 44(C), pages 328-339.
    3. Zhang, Yali & Zou, Qing-Ping & Greaves, Deborah, 2012. "Air–water two-phase flow modelling of hydrodynamic performance of an oscillating water column device," Renewable Energy, Elsevier, vol. 41(C), pages 159-170.
    4. Josset, C. & Clément, A.H., 2007. "A time-domain numerical simulator for oscillating water column wave power plants," Renewable Energy, Elsevier, vol. 32(8), pages 1379-1402.
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