基于CFD的海洋平台桩基冲刷的数值模拟研究

Research on Pile Foundation Scouring of Offshore Platform Based onCFD Numerical Simulation

洋流对桩基的冲刷可能导致海洋风电平台结构失稳。因此,需要深入研究洋流对桩基周围的冲刷过程,探索不同桩基直径在洋流下的冲刷规律。文章设计了2.4米、3.5米、4.0米直径的桩基,对桩基和流场进行多尺度的网格划分,通过CFD实验研究了不同直径的单桩基础周围的海床冲刷问题。仿真实验结果表明,当桩基直径增大时,如果冲刷水流速度不变,冲刷孔的深度会增加。根据仿真试验结果,提出了预测风电桩基周围冲刷深度的经验公式。

The scouring of pile foundation may lead to the structural instability of offshore wind power platform.Therefore,it is necessary to research the scouring process of the current around the pile foundation and explore the scouring law under the different pile foundation diameters.In this paper,pile foundations with diameters of 2.4 m,3.5 m and 4.0 m are designed,and the multi-scale grid division of pile foundation and flow field is carried out.The problem of seabed scouring around single pile foundations with different diameters is studied through CFD experiments.The simulation experiment results show that when the diameter of pile foundation increases,the depth of scouring hole will increase if the velocity of scouring water remains unchanged.Based on the simulation experiment results,an empirical formula for predicting the scouring depth around the wind power pile foundation is proposed.