浮式平台-波能浮子系统全非线性耦合运动及能量转换特性研究

海洋浮式平台远离陆地，能源等物资补给困难，费用高昂，如能就地利用海洋可再生能源，将大幅提高浮式平台的生存和作业能力。波浪能以其分布范围广、能量密度高等优点获得了广泛的关注和应用。浮式平台-波能浮子系统是一个波浪与多浮体相互作用的复杂系统，其中波浪、平台、波能浮子、系泊之间的耦合作用是研究难点，目前的分析方法尚不够完善。本项目基于势流和粘流理论，建立有效的浮式平台-波能浮子系统全非线性耦合水动力模型和求解方法；揭示浮式平台和波能浮子之间耦合运动和能量转换特性的变化规律和机理特征，探索可能的极端运动响应、载荷、准陷波现象等；开展水动力模型试验，为理论模型算法和机理的研究和验证提供依据；构建一套高效获能、安全稳定的浮式平台与波能装置组合的基本方案。本项目完成，对于丰富浮式平台与波能装置耦合系统的水动力设计理论具有重要意义，为提高波能装置的获能效率、改善耦合系统整体性能奠定科学方法与技术基础。

Floating offshore platforms (FOPs) are remote from land, making their provision of resource difficult and expensive. If local ocean renewable energy could be used, the survivability and service ability of FOPs will be greatly improved. Wave energy is increasingly concerned and applied due to the advantages of wide distribution and high energy density. The combination of a FOP and wave energy converters (WECs) is a complex system including coupled motion between water waves and multiple floating bodies. The coupled effect between water waves, floating platform, wave energy converters, and mooring lines is a tough problem. Current analytical methods are inadequate. Based on the potential flow and viscous flow theories, this project aims to develop an effective mathematical model and numerical algorithm for the simulation of the fully nonlinear FOP-WECs coupled hydrodynamic problem; to reveal the varying discipline and the mechanism nature of the energy conversion characteristics and the coupled motion between the platform and WECs; to explore the mechanical phenomena such as possible extreme motion response, loads, and near-trapping; to conduct model test, offering warrant for the investigation and verification of theoretical model and mechanism; to establish fundamentals of an effective, safe, and robust FOP-WECs combination scenario. This project is important and meaningful for the enrichment of the hydrodynamic design theory of the FOP-WECs system and for the establishment of scientific approach and technical foundation to improve the efficiency of WECs and the performance of the coupled system.