Motions and loads on dynamic export cables for floating Offshore Renewable Energy farms using physical and numerical modelling.

所有海上可再生能源（ORE）系统的一个共同特征是需要从风、波浪或水流中提取的能量通过电缆传输到海岸。目前，现有的电缆设计通常继承自固定的陆上/海上风力或海上石油和天然气部门，并且其对于浮动ORE农场的有效性存在不确定性。一个关键的挑战是了解电缆所承受的运动和相应的载荷，以及这些载荷在不同情况下如何取决于电缆的状态。海底条件、设备运动和与浮式设备的连接方法预计都会影响这些载荷。电缆故障发生主要是由于极端载荷和疲劳损伤中的一个或两个。该博士奖学金旨在利用和开发物理和数值建模工具，以模拟两点之间悬挂的电缆的行为，从而有助于最大限度地减少这些组件故障的可能性。我们将重点讨论两种情况;不同海底拓扑结构上的悬浮和两个互连设备之间的悬浮。博士学位的目标是：建立协议，并进行，电缆响应在海岸实验室的规模模型测试。调整现有的数值模型，以模拟两种电缆方案中的水动力和运动。这将包括使用和开发现有的系泊线模型和/或完全非线性OpenFOAM模拟。 应用材料建模方法对极端载荷和模拟运动导致的疲劳造成的电缆损坏进行建模。

A common feature of all Offshore Renewable Energy (ORE) systems is the need for energy extracted from either wind, waves or currents to be transmit to shore via cables. At present, existing cabling designs are generally inherited from fixed onshore/offshore wind or the offshore oil and gas sectors, and there is uncertainty in their effectiveness for floating ORE farms. One key challenge is understanding the motions and corresponding loads that cables are exposed to, and how these are dependent on the state of the cable under different scenarios. Seabed conditions, device motions and method of connection to the floating devices are all expected to influence these loads. Cable failures occur primarily due to either or both extreme loads and fatigue damage This PhD scholarship aims to utilise and develop physical and numerical modelling tools to characterise the behaviour of cables that are in suspension between two points, and hence help to minimise the likelihood of failure of these component. We will focus on two scenarios; suspension over varying seabed topology and suspension between two interconnected devices. The PhD objectives are to: Establish protocols for, and carry out, scale model testing of cable response within the COAST laboratory. Adapt existing numerical models to simulate the hydrodynamic forces and motions in the two cable scenarios. This will include use and development of existing mooring line models and/or fully non-linear OpenFOAM simulations. Apply material modelling methods to model cable damage from both extreme loads and fatigue resulting from the modelled motions.