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Numerical analysis of a water column and structure heave velocity relationship for a floating oscillating water column wave energy device

Conference Paper


Abstract


  • This paper investigates a method to determine the relative power

    production potential of a floating oscillating water column wave energy

    converter. This method focuses on determining the key characteristics of

    the parametric function relating the water column heave velocity to the

    structure heave velocity. The numerical investigation is undertaken using

    single frequency sinusoidal waves using WAMIT and OrcaFlex.

    The paired velocities of the structure and the water column surface

    follow an elliptical function. The properties of this ellipse yields

    interesting information about the power produced by the OWC. It has

    been determined through investigation into the length and gradient of the

    major (long) and minor (short) axes of the bisector of the ellipse that

    relates the vertical water column heave velocity to the structure heave

    velocity that the power production potential is linearly proportional to

    the magnitude of of relative velocity between the water column and

    floating structure more so than a phase difference between these two

    velocities.

    It has also been determined that the lengths of both axes of the ellipse are

    maximised, and hence system efficiency, when the forcing frequency is

    equal to approximately 90-100% of the of natural frequency of the water

    column of the system in question.

Publication Date


  • 2016

Citation


  • Stanham, Y., McCarthy, T. J. & Stappenbelt, B. (2016). Numerical analysis of a water column and structure heave velocity relationship for a floating oscillating water column wave energy device. The Twenty-sixth (2016) International Ocean and Polar Engineering Conference (pp. 678-683). Cupertino, CA, USA: ISOPE.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6303

Start Page


  • 678

End Page


  • 683

Place Of Publication


  • http://www.isope.org/publications/publications.htm

Abstract


  • This paper investigates a method to determine the relative power

    production potential of a floating oscillating water column wave energy

    converter. This method focuses on determining the key characteristics of

    the parametric function relating the water column heave velocity to the

    structure heave velocity. The numerical investigation is undertaken using

    single frequency sinusoidal waves using WAMIT and OrcaFlex.

    The paired velocities of the structure and the water column surface

    follow an elliptical function. The properties of this ellipse yields

    interesting information about the power produced by the OWC. It has

    been determined through investigation into the length and gradient of the

    major (long) and minor (short) axes of the bisector of the ellipse that

    relates the vertical water column heave velocity to the structure heave

    velocity that the power production potential is linearly proportional to

    the magnitude of of relative velocity between the water column and

    floating structure more so than a phase difference between these two

    velocities.

    It has also been determined that the lengths of both axes of the ellipse are

    maximised, and hence system efficiency, when the forcing frequency is

    equal to approximately 90-100% of the of natural frequency of the water

    column of the system in question.

Publication Date


  • 2016

Citation


  • Stanham, Y., McCarthy, T. J. & Stappenbelt, B. (2016). Numerical analysis of a water column and structure heave velocity relationship for a floating oscillating water column wave energy device. The Twenty-sixth (2016) International Ocean and Polar Engineering Conference (pp. 678-683). Cupertino, CA, USA: ISOPE.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6303

Start Page


  • 678

End Page


  • 683

Place Of Publication


  • http://www.isope.org/publications/publications.htm