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Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column

Author

Listed:
  • Harry B. Bingham

    (Department of Mechanical Engineering, Technical University of Denmark (DTU), DK-2800 Kgs. Lyngby, Denmark)

  • Yi-Hsiang Yu

    (National Renewable Energy Laboratory (NREL), 15013 Denver West Parkway, Golden, CO 80401, USA)

  • Kim Nielsen

    (Ramboll Group A/S, Hannemanns Allé 53, DK-2300 Copenhagen S, Denmark
    Department of Civil Engineering, Aalborg University (AAU), Thomas Mann Vej 23, 9220 Aalborg, Denmark)

  • Thanh Toan Tran

    (National Renewable Energy Laboratory (NREL), 15013 Denver West Parkway, Golden, CO 80401, USA)

  • Kyong-Hwan Kim

    (Korea Research Institute of Ships and Ocean Engineering (KRISO), 1312-32 Yuseong-daero, Yuseong-gu, Daejeon 34103, Korea)

  • Sewan Park

    (Korea Research Institute of Ships and Ocean Engineering (KRISO), 1312-32 Yuseong-daero, Yuseong-gu, Daejeon 34103, Korea)

  • Keyyong Hong

    (Korea Research Institute of Ships and Ocean Engineering (KRISO), 1312-32 Yuseong-daero, Yuseong-gu, Daejeon 34103, Korea)

  • Hafiz Ahsan Said

    (Center for Ocean Energy Research, Maynooth University, W23 F2H6 Co. Kildare, Ireland)

  • Thomas Kelly

    (Center for Renewable Energy, Dundalk Institute of Technology, A91 K584 Dundalk, Ireland)

  • John V. Ringwood

    (Center for Ocean Energy Research, Maynooth University, W23 F2H6 Co. Kildare, Ireland)

  • Robert W. Read

    (Department of Mechanical Engineering, Technical University of Denmark (DTU), DK-2800 Kgs. Lyngby, Denmark)

  • Edward Ransley

    (School of Engineering, Computing and Mathematics, University of Plymouth, Plymouth PL4 8AA, UK)

  • Scott Brown

    (School of Engineering, Computing and Mathematics, University of Plymouth, Plymouth PL4 8AA, UK)

  • Deborah Greaves

    (School of Engineering, Computing and Mathematics, University of Plymouth, Plymouth PL4 8AA, UK)

Abstract

This paper reports on an ongoing international effort to establish guidelines for numerical modeling of wave energy converters, initiated by the International Energy Agency Technology Collaboration Program for Ocean Energy Systems. Initial results for point absorbers were presented in previous work, and here we present results for a breakwater-mounted Oscillating Water Column (OWC) device. The experimental model is at scale 1:4 relative to a full-scale installation in a water depth of 12.8 m. The power-extracting air turbine is modeled by an orifice plate of 1–2% of the internal chamber surface area. Measurements of chamber surface elevation, air flow through the orifice, and pressure difference across the orifice are compared with numerical calculations using both weakly-nonlinear potential flow theory and computational fluid dynamics. Both compressible- and incompressible-flow models are considered, and the effects of air compressibility are found to have a significant influence on the motion of the internal chamber surface. Recommendations are made for reducing uncertainties in future experimental campaigns, which are critical to enable firm conclusions to be drawn about the relative accuracy of the numerical models. It is well-known that boundary element method solutions of the linear potential flow problem (e.g., WAMIT) are singular at infinite frequency when panels are placed directly on the free surface. This is problematic for time-domain solutions where the value of the added mass matrix at infinite frequency is critical, especially for OWC chambers, which are modeled by zero-mass elements on the free surface. A straightforward rational procedure is described to replace ad-hoc solutions to this problem that have been proposed in the literature.

Suggested Citation

  • Harry B. Bingham & Yi-Hsiang Yu & Kim Nielsen & Thanh Toan Tran & Kyong-Hwan Kim & Sewan Park & Keyyong Hong & Hafiz Ahsan Said & Thomas Kelly & John V. Ringwood & Robert W. Read & Edward Ransley & Sc, 2021. "Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column," Energies, MDPI, vol. 14(6), pages 1-35, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:6:p:1718-:d:520560
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    References listed on IDEAS

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    1. Henriques, J.C.C. & Gomes, R.P.F. & Gato, L.M.C. & Falcão, A.F.O. & Robles, E. & Ceballos, S., 2016. "Testing and control of a power take-off system for an oscillating-water-column wave energy converter," Renewable Energy, Elsevier, vol. 85(C), pages 714-724.
    2. Dallman, Ann & Jenne, Dale S. & Neary, Vincent & Driscoll, Frederick & Thresher, Robert & Gunawan, Budi, 2018. "Evaluation of performance metrics for the Wave Energy Prize converters tested at 1/20th scale," Renewable and Sustainable Energy Reviews, Elsevier, vol. 98(C), pages 79-91.
    3. Windt, Christian & Davidson, Josh & Ringwood, John V., 2018. "High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks," Renewable and Sustainable Energy Reviews, Elsevier, vol. 93(C), pages 610-630.
    4. Luczko, Ewelina & Robertson, Bryson & Bailey, Helen & Hiles, Clayton & Buckham, Bradley, 2018. "Representing non-linear wave energy converters in coastal wave models," Renewable Energy, Elsevier, vol. 118(C), pages 376-385.
    5. Guo, Bingyong & Patton, Ron J. & Jin, Siya & Lan, Jianglin, 2018. "Numerical and experimental studies of excitation force approximation for wave energy conversion," Renewable Energy, Elsevier, vol. 125(C), pages 877-889.
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    Cited by:

    1. Guo, Bingyong & Ringwood, John V., 2021. "Geometric optimisation of wave energy conversion devices: A survey," Applied Energy, Elsevier, vol. 297(C).

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