近海固定式风机单桩大直径基础波浪载荷研究

Research on fixed large-diameter monopile foundation of an inshore wind turbine under sea loads

以一种近海风机的固定式单桩大直径基础为研究对象,使用计算流体力学(CFD)软件STARCCM+计算求解了该基础在几种典型的波浪工况(包括规则波和不规则波)及不同海底泥面条件下所受的波浪载荷。本文通过对不同条件下载荷的数值和幅值频率进行比较分析,得出不同情况下桩基础受载的变化情况,总结相关规律,为结构设计提供参考。此外,本文将上述数值模拟结果与工程中常用的,由MacCamy和Fuchs提出的平面波对单圆柱作用的计算结果进行对比,从而分析了本文使用的数值模拟方法与势流理论下对波浪载荷计算结果的差异。

A fixed monopile foundation with a large diameter for the inshore wind turbine is analyzed by STAR- CCM+,a computational fluid dynamic (CFD)software.The analysis has to do with different sea loads under several typical wave conditions (including two regular waves and two irregular waves)and three seabed conditions.The variation of loads on the foundation and the summary of its regularity are derived from comparison among values and frequencies of loads in different conditions,which offers some references for structural design.Moreover,the discrepancy between numerical simulation method and potential method is also analyzed by comparing frequently-used theoretical results stemming from Mac- Camy and Fuchs,who analyzed the reaction between plane waves and a single cylinder,with the numerical results obtained from the CFD soft-ware.