基于Flow^(3D)的海上风电单桩基础局部冲刷数值模拟研究

Local Scour of Single Pile Foundation of Offshore Wind Power Based on Flow^(3D) Numerical Simulation

基于江苏竹根沙海上风电场项目典型海域水文地质资料,采用Flow^(3D)数值模拟方法,建立单桩基础局部冲刷数值模拟,分析流速和桩径对单桩基础局部冲刷效果的影响规律,得到了以下结论:(1)随着冲刷历时的增加,单桩基础局部冲刷深度在前900 s的时间内显著增加,随后冲刷深度增速逐渐趋缓,在冲刷1 h时,冲刷深度为最终冲刷深的76%。(2)流速小于床沙起动流速时,随着流速的增加,局部冲刷深度缓慢增加;流速大于起动流速时,冲刷深度随流速的增加而显著增大。(3)冲刷深度随着桩径的增加而增大,但其增量有逐渐减小的趋势,6.0 m桩径的局部冲刷深度近似为5.0 m桩径的2倍。

Based on the hydrogeological data of the typical sea area of the Jiangsu Zhugensha offshore wind farm project,the Flow^(3D)numerical simulation method was used to establish a numerical model of the local scour of a single pile foundation.The effects of the influence of flow velocity and pile diameter on the local scour of the single pile foundation were analyzed.The main conclusions are as follows:(1)With the increase of the scour duration,the local scour depth of the single pile foundation increases significantly at the begin of 900 s,and then the growth rate of the scour depth gradually slows down.When the scour is 1 h,the scour depth is around of 76%of the final scour depth.(2)When the flow velocity is less than the starting flow velocity of the bed sand,the local scour depth increases slowly with the increase of the flow velocity;when the flow velocity is greater than the starting flow velocity,the scour depth increases significantly with the increase of the flow velocity.(3)The scour depth increases as the pile diameter increases,but the increment has a gradual decrease.The local scour depth of 6.0 m pile diameter is approximately twice that of 5.0 m pile diameter.