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Development of a fully nonlinear, coupled numerical model for assessment of floating tidal stream concepts

机译：一种全非线性，耦合数值模型的发展，用于评估浮动潮流概念

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摘要

Compared with existing seabed mounted systems, floating tidal concepts offer an increase in viable sites, along with the ability to harvest higher flow speeds near the free surface. However, such systems will be required to survive in high-energy wave-driven environments, and the performance and survivability of such systems is largely unknown. Current industry standards generally use a decoupled numerical approach to assess this problem, but this paper presents the development of a framework for an efficient numerical tool that is capable of predicting the fully nonlinear, coupled behaviour of floating tidal stream systems. Using the open-source CFD libraries of OpenFOAM as a basis, and a previously developed computationally efficient turbine model, the framework has been demonstrated using a generalised system. Verification against alternative codes based on linear potential theory shows good agreement when the floating structure is considered alone in linear waves. Systematic introduction of mooring forces and the turbine model demonstrates that it is necessary to consider all components of a floating tidal concept simultaneously, and that coupling between platform motion and fluid flow can substantially increase the cyclic amplitude of the turbine loading compared with a fixed device.
机译：与现有的海底安装系统相比，浮动潮汐概念提供可行性位点的增加，以及收获更高的自由表面的流速的能力。然而，这种系统将在高能量波驱动的环境中存活，并且这种系统的性能和生存性在很大程度上是未知的。目前的行业标准通常使用解耦的数值方法来评估这个问题，但本文提出了一种能够预测浮动潮流系统的完全非线性，耦合行为的有效数值工具框架的框架的开发。使用OpenFoam的开源CFD库作为基础，并且先前开发的计算上高效的涡轮机模型，使用广义系统进行了演示框架。当浮动结构在线性波看到时，基于线性电位理论对基于线性电位理论的替代码的验证表现出良好的一致性。系统引入系泊力和涡轮机模型表明，必须同时考虑浮动潮汐概念的所有组件，并且平台运动与流体流动之间的耦合可以基本上与固定装置相比增加涡轮机负荷的循环幅度。

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  • 来源
    《Ocean Engineering》 |2020年第2期|108253.1-108253.11|共11页
  • 作者

    Brown S. A.; Ransley E. J.; Zheng S.; Xie N.; Howey B.; Greaves D. M.;

  • 作者单位

    Univ Plymouth Sch Engn Comp & Math Plymouth Devon England;

    Univ Plymouth Sch Engn Comp & Math Plymouth Devon England;

    Univ Plymouth Sch Engn Comp & Math Plymouth Devon England;

    Univ Plymouth Sch Engn Comp & Math Plymouth Devon England|Saipem UK Ltd Dept Engn Kingston Upon Thames Surrey England;

    Univ Plymouth Sch Engn Comp & Math Plymouth Devon England|Plymouth Marine Lab Plymouth Devon England;

    Univ Plymouth Sch Engn Comp & Math Plymouth Devon England;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    CFD; OpenFOAM; Actuator theory; HATT model; Marine renewable energy; Linear potential flow theory;

    机译：CFD;OpenFoam;执行器理论;Hatt模型;海洋可再生能源;线性潜在流动理论;

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