Vortex-induced vibrations (VIV) assessment of subsea power cables and mooring lines of offshore renewable energy converters

海上可再生能源提供了一种利用非传统地区大量能源的方法。然而，由于近海环境的性质，还出现了土地分期付款所不存在的其他问题。其中一个问题是悬挂电缆的损坏和故障，无论是用于系泊还是电力传输。这些电缆的故障可能是危险的，更换起来也很昂贵。随着世界各地海上项目的扩大和浮动风力涡轮机的出现，对这些电缆的依赖将增加。我的研究目的是调查这些电缆和系泊缆的涡激振动的问题，将产生的主要解决方案是：什么是水下柔性电力电缆和系泊缆的涡激振动（横流，线内和轴向响应）的性质和一般特征组合波流湍流场景？在波、流、紊流联合作用下，涡激振动的最大振幅和放大后的平均位移是多少？环境湍流与波流相互作用如何影响水动力和缆绳/系泊响应，以及如何评估疲劳载荷？在抑制动力电缆和系泊缆的涡激振动时，可以采用哪些方法？研究将通过数值和理论方法相结合进行。它还可能涉及使用Flo-Wave设施来验证所使用的数值和理论方法。

Offshore renewables provide a way to harness the huge amounts of energy resources available in unconventional locations. However, due to the nature of an offshore environment, there are other issues introduced that are not present with land instalments. One such issue is the damage and failure of suspended cables, whether for moorings or electricity transfer. The failures of these cables can be dangerous and expensive to replace. With the expansion of offshore projects across the world and the emergence of floating wind turbines the dependence on these cables is set to increase. My research aims to investigate the issue of vortex-induced vibrations on these cables and mooring lines.The main solutions that will be produced are: What are the nature and general features of VIV (cross-flow, in-line and axial responses) of a submerged flexible power cable and mooring lines under combined wave-current-turbulence scenarios? What are the maximum VIV amplitudes and amplified mean displacements under combined wave-current-turbulence environment? How does the ambient turbulence combined with wave-current interactions affect hydrodynamic forces and cable/mooring responses and how to evaluate fatigue loadings? What methods can be adapted in VIV suppression of power cables and mooring lines? The research will be carried out through a combination of numerical and theoretical methods. It may also involve the use of the Flo-Wave facilities to validate the numerical and theoretical methods used.