浅水浮式风机基础水动力特性及波浪荷载的CFD数值分析  

Numerical Analysis of Hydrodynamic Properties and Wave Loads of the Floating Wind Turbine Foundation in Shallow Water Using CFD

作　　者：朱志浩 张敏[1] 袁文永 Zhu Zhihao;Zhang Min;Yuan Wenyong(College of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2023年第12期155-162,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金——基础科学中心项目(52088102);中央高校基本科研业务费专项(202213032)资助。

摘　　要：采用计算流体动力学(CFD)方法对OC4-DeepCwind半潜式风机基础在30~100 m水深下的水动力特性和非线性波浪荷载进行了研究。基于验证的数值波浪水池,通过结构自由衰减运动及规则波下浮式基础的幅值响应算子(RAO)计算,分析了浮式风机基础的结构动力特性及水动力特性随水深的变化规律,研究了浅水条件下非线性波浪荷载特征。研究结果表明,随着水深的减小,风机基础结构垂荡固有周期略有增大,垂荡和纵摇的阻尼比均呈现逐渐增大的趋势;与黏性流理论计算结果相比,势流结果在浅水波浪工况下对垂荡和纵摇RAO存在显著低估;在浅水波浪作用下,风机基础所受波浪荷载的三倍波频成分占比可超过5%,体现了浅水条件下波浪与结构之间较强的非线性作用。The hydrodynamic properties and nonlinear wave loads of OC4-DeepCwind semi-submersible wind turbine foundation at water depths from 30 to 100 m are investigated using CFD method.Based on the validated numerical wave tank,the variation law of structural dynamic properties and hydrodynamic properties of the foundation with water depth is analyzed by the free decay motion and the calculation of response amplitude operator(RAO)of the foundation under regular waves,and the properties of nonlinear wave loads in shallow water are studied.The results show that with the decrease of water depth,the natural period in heave of the foundation increases slightly,and the damping ratio in heave and pitch increases gradually.Compared with the results of viscous flow theory,the potential flow results significantly underestimate the RAO in heave and pitch under shallow water waves.And the triple frequency wave load can exceed 5%under shallow water waves,reflecting the strong nonlinear effect between the wave and the structure in shallow water.

关 键 词：漂浮式风机 计算流体动力学(CFD) 浅水 平台水动力 非线性波浪荷载 

分 类 号：P752[天文地球—海洋科学]