基于梁刚体元模型的圆柱风致响应耦合分析

基于梁刚体元方法提出了圆柱风致响应分析的近似模型,通过计算流体动力学(CFD)求解器FLUENT及其动网格方法求解流体方程,实现了结构与流体的流固弱耦合分析,并利用精细积分法提高了结构的动力分析效率.针对梁刚体元近似模型、刚性模型与弹性模型,比较了不同风速下三维圆柱结构的顶部位移与加速度响应.结果表明,随着风速的增大,结构横向振动幅值呈非线性增加;不考虑耦合作用的刚性模型计算结果误差较大.

Coupling analysis of wind-induced responses of cylindrical structure based on beam-rigid element model

An approximate model of wind-induced responses of the cylindrical structure is proposed based on the beam-rigid element method,and the weak fluid-structure interaction analysis is executed by using the FLUENT code of computational fluid dynamics(CFD) technology combined with dynamic meshing method,and the precise integration method is employed to improve the computational efficiency.The top displacement and acceleration of a 3-D cylindrical structure under different wind speeds are compared based on the proposed beam-rigid element approximate model,rigid model and elastic model.The experimental results show that the increment of wind speed nonlinearly increases the amplitude of across-wind vibration.For the rigid model,the neglect of coupling between fluid and structure may lead to bigger errors.