This work focuses on the study of the phenomenon of vortex-induced vibrations in overhead lines under the effect of weak winds. Full three-dimensional simulation is not feasible because of the high length to width aspect ratios of the overhead lines. Thus a quasi-3D method based on strip theory is adopted in this work. This method decouples the system of interactions between the overhead line and the wind into a series of sub-systems. The fluid flow in each sub-system is represented as a series of independent rigid oscillating cylinder flows that are only coupled through the transmission line model. To avoid the use of a moving mesh for the fluid domain, a moving reference frame approach is employed. In this approach, the coordinate axes of the flow simulation are attached to the oscillating cylinder and an acceleration term in the flow equations accounts for the cable motion. Moreover, in order to take into account the turbulent effect in the flow, turbulence models, including RANS, LES and DES, are evaluated for the present application involving flows in the sub-critical regime. Finally, numerical test cases are performed in order to validate the turbulence models and the moving reference frame approach, then cable dynamics test cases are conducted to validate the quasi-3D method.

这项工作的重点是研究在弱风的作用下架空线中的涡激振动现象。由于架空线的长宽比高，因此无法进行完整的三维模拟。因此，本文采用基于条带理论的准3D方法。这种方法将架空线和风之间的相互作用系统分离为一系列子系统。每个子系统中的流体流表示为一系列独立的刚性振荡缸流，它们仅通过传输线模型耦合。为了避免在流体域中使用移动网格，采用了移动参考框架方法。用这种方法 流量模拟的坐标轴连接到摆动缸上，流量方程中的加速度项说明了电缆的运动。此外，为了考虑流动中的湍流效应，针对涉及亚临界状态中的流动的本申请评估了包括RANS，LES和DES在内的湍流模型。最后，进行数值测试以验证湍流模型和移动参考系方法，然后进行电缆动力学测试以验证准3D方法。