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    Linear parametric hydrodynamic models based on numerical wave tank experiments

    Davidson, J. and Giorgi, Simone and Ringwood, John (2013) Linear parametric hydrodynamic models based on numerical wave tank experiments. Proceedings EWTEC 2013. ISSN 2309 - 1983

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    Hydrodynamic models are important for the design and control of wave energy converters. Traditionally they have been obtained using velocity potential/boundary element type methods, however associated assumptions of in viscid fluid, irrotational flow, small waves and small body motions are a major limitation of this modelling approach, since WECs are designed to operate over wide wave amplitude ranges experiencing large motions, viscous drag and breaking waves. With consideration of the full range of effects, the physics can be described using the Navier-Stokes equations and implemented using computational fluid dynamics (CFD). However, CFD is too computationally expensive for many purposes, for example in initial design optimisation and in the development of control algorithms, where long-time simulations are required. This paper therefore seeks to combine the strengths of both modelling approaches by developing linear parametric models using system identification techniques on CFD generated data. This new approach is demonstrated by identifying the radiation parameters of a linear hydrodynamic model using information from the object’s free decay oscillation simulated in a numerical wave tank (NWT). It is shown to have the ability to produce different representative models for different operational amplitudes; an advantage over the traditional approach which is only representative over small amplitude conditions.

    Item Type: Article
    Keywords: Linear parametric hydrodynamic models; numerical wave tank experiments;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
    Item ID: 6792
    Depositing User: Professor John Ringwood
    Date Deposited: 14 Jan 2016 10:40
    Journal or Publication Title: Proceedings EWTEC 2013
    Publisher: EWTEC
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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