海上风电场四圆柱基础冲刷问题数值模拟研究

Numerical simulation study on the scouring problem of four-cylinder foundations in offshore wind farms

海上风电场的基础冲刷问题危害着整体结构的耐久性和安全性。针对某海上风机四圆柱基础的冲刷问题开展数值模拟研究。采用SST k-ω湍流模型描述水流动力学,采用Exner方程描述水-泥沙交界面运动,采用浸入边界法描述水和泥沙的耦合作用。采用单桩冲刷算例验证了计算方法的准确性和可行性。对于风机的四圆柱基础冲刷问题,研究了0°和45°来流作用下的基础冲刷问题。模拟结果显示,4个圆柱基础均有不同程度的冲刷深度,上游圆柱产生的涡流场会引起下游圆柱基础的进一步冲刷。

The foundation scouring problem of offshore wind farms endangers the overall structural durability and safety.A numerical simulation study was conducted on the scouring problem of the four-cylinder foundation of an offshore wind turbine.The SST-kω turbulence model was used to simulate the flow dynamics,the Exner equation was used to simulate the motion of the water-sediment interface,and the immersed boundary method were used to simulate the coupling effect of water and sediment.The accuracy and feasibility of the calculation method were verified using a single pile scouring example.For the four-cylinder foundation scouring problem of wind turbines,the foundation scouring problem at flow incidence of 0°and 45°inflow was studied.The simulation results show that the scour depths can be observed on each of the four-cylinders'foundation,and that the vortex field from the upstream cylinder may cause further scour phenomenon on the downstream cylinder foundation.