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Re-Creating Waves in Large Currents for Tidal Energy Applications

Author

Listed:
  • Samuel Draycott

    (School of Engineering, Institute for Energy Systems, The University of Edinburgh, Edinburgh EH9 3DW, UK)

  • Duncan Sutherland

    (School of Engineering, Institute for Energy Systems, The University of Edinburgh, Edinburgh EH9 3DW, UK)

  • Jeffrey Steynor

    (School of Engineering, Institute for Energy Systems, The University of Edinburgh, Edinburgh EH9 3DW, UK)

  • Brian Sellar

    (School of Engineering, Institute for Energy Systems, The University of Edinburgh, Edinburgh EH9 3DW, UK)

  • Vengatesan Venugopal

    (School of Engineering, Institute for Energy Systems, The University of Edinburgh, Edinburgh EH9 3DW, UK)

Abstract

Unsteady wave loading on tidal turbines impacts significantly the design, and expected life-time, of turbine blades and other key components. Model-scale testing of tidal turbines in the wave-current environment can provide vital understanding by emulating real-world load cases; however, to reduce uncertainty, it is important to isolate laboratory-specific artefacts from real-world behaviour. In this paper, a variety of realistic combined current-wave scenarios is re-created at the FloWave basin, where the main objective is to understand the characteristics of testing in a combined wave-current environment and assess whether wave effects on the flow field can be predicted. Here, we show that a combination of linear wave-current theory and frequency-domain reflection analysis can be used to effectively predict wave-induced particle velocities and identify velocity components that are experimental artefacts. Load-specific mechanisms present in real-world conditions can therefore be isolated, and equivalent full-scale load cases can be estimated with greater confidence. At higher flow speeds, a divergence from the theory presented is observed due to turbulence-induced non-stationarity. The methodology and results presented increase learning about the wave-current testing environment and provide analysis tools able to improve test outputs and conclusions from scale model testing.

Suggested Citation

  • Samuel Draycott & Duncan Sutherland & Jeffrey Steynor & Brian Sellar & Vengatesan Venugopal, 2017. "Re-Creating Waves in Large Currents for Tidal Energy Applications," Energies, MDPI, vol. 10(11), pages 1-24, November.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1838-:d:118372
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    References listed on IDEAS

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    1. Luznik, Luksa & Flack, Karen A. & Lust, Ethan E. & Taylor, Katharin, 2013. "The effect of surface waves on the performance characteristics of a model tidal turbine," Renewable Energy, Elsevier, vol. 58(C), pages 108-114.
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    Cited by:

    1. Draycott, S. & Sellar, B. & Davey, T. & Noble, D.R. & Venugopal, V. & Ingram, D.M., 2019. "Capture and simulation of the ocean environment for offshore renewable energy," Renewable and Sustainable Energy Reviews, Elsevier, vol. 104(C), pages 15-29.
    2. Draycott, S. & Nambiar, A. & Sellar, B. & Davey, T. & Venugopal, V., 2019. "Assessing extreme loads on a tidal turbine using focused wave groups in energetic currents," Renewable Energy, Elsevier, vol. 135(C), pages 1013-1024.
    3. Lam, Raymond & Dubon, Sergio Lopez & Sellar, Brian & Vogel, Christopher & Davey, Thomas & Steynor, Jeffrey, 2023. "Temporal and spatial characterisation of tidal blade load variation for structural fatigue testing," Renewable Energy, Elsevier, vol. 208(C), pages 665-678.

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