Towards a unified approach for the hydrodynamic modelling of WECs: Effective linkage of non-linearity and viscous damping in potential flow models

这项工作是在中英“海洋开发可行性研究”呼吁的背景下进行的。这一呼吁是通过英国和中国研究委员会之间的联合研讨会制定的。作为研讨会的一部分，确定了四个关键领域，对中国波浪和潮汐能的发展至关重要。这里提出的研究跨越两个领域：“提高生存能力”和“整体集成设计工具”。更具体地说，本工作的目的和目标解决有关的重要问题“了解系统动态，以提高可靠性和生存能力”。在整体设计工具的背景下，该研究解决了“CFD技术（包括势流模型）评估流体结构相互作用”的改进。目前工作的这两个关键要素紧密相连，相辅相成。虽然增强的CFD技术作为重要的设计工具，波能转换（WEC）的开发人员，他们也迫切需要使和理解WEC加载制度。反过来，对装载状态的牢固理解将导致改进生存性设计。这些新技术在解决与器件可靠性和疲劳载荷相关的问题方面也至关重要。在应对这些挑战时，对粘性效应和非线性的理解是核心。人们相信，对波浪结构相互作用中粘性效应和非线性的物理理解的增强将刺激中国和英国波浪能提取的发展。就中国而言，这是希望减少对目前从国外进口的化石资源的高度依赖。对于英国来说，开发波浪能是实现长期二氧化碳排放目标的一个重要因素。本项目开发的新统一模型将为预测流体动力学特性、动态载荷和疲劳效应提供更有效和更准确的耦合方法。总体而言，这为改进浮动WEC的设计，其生存能力和实际维护提供了基础。

This work is undertaken in the context of the UK-China "Marine Development Feasibility Studies" call. This call was developed through a joint workshop between the UK and China research councils. As part of this workshop, four key areas were identified as critical to the development of wave and tidal energy in China. The research proposed here spans across two of these areas: "Increasing Survivability" and "Holistic Integrated Design Tools". More specifically, the aims and objectives of the present work address important questions related to "Understanding the system dynamics to increase reliability and survivability". In the context of holistic design tools, the research addresses improvements in "CFD techniques (including potential flow models) to assess fluid structure interactions". These two key elements of the present work are tightly linked, with one building upon the other. Whilst enhanced CFD techniques act as important design tools for wave energy conversion (WEC) developers, they are also urgently required to enable and understanding of WEC loading regimes. A firm understanding of loading regimes, in turn, will lead to improved design for survivability. These novel techniques are also crucial in addressing issues related to device reliability and fatigue loading. In addressing these challenges, the understanding of viscous effects and nonlinearities are central.The enhanced physical understanding of both viscous effects and nonlinearity in wave structure interactions is believed to stimulate the development of wave energy extraction in both China and the UK. In the case of China, this is hoped to reduce the high dependence on fossil resources currently imported from abroad. For the UK, the development of wave energy is an important element in meeting the long-term CO2 emission targets.The new unified model to be developed in this project will lead to a more efficient and accurate coupling method for the prediction of hydrodynamic characteristics, dynamic loadings and fatigue effects. Taken as a whole, this provides the base for the improved design of floating WECs, their survivability, and practical maintenance.