薄平板气动导数的数值仿真技术

Evaluating Flutter Derivatives of the Thin Plate by Applying the Numerical Simulation Method

提出了一种基于计算流体动力学方法计算流线型断面气动导数的数值模型.该模型以粘性不可压Navier-Stokes方程和有限体积法为基础,通过求解作强迫振动的断面绕流场,由得到的气动力时程得到断面的气动导数.利用该模型数值模拟了薄平板的气动导数,其仿真结果与薄平板气动导数风洞试验值、Theodorsen理想平板解析解的一致性,证明了本文方法的有效性.该数值方法可应用于桥梁断面颤振导数的识别.

A numerical simulation model based on Computational Fluid Dynamics（UFD） was presented to evaluate the flutter derivatives of streamlined section. This numerical model, derived from viscid incompressible Navier-Stokes equations and finite volume method, aimed to scribed vibration, and obtained aerodynamic forces series, solve the flow field around section undergoing prewith the ultimate objective to extract the flutter derivatives of the section. The proposed model was applied to the thin plate, and its flutter derivatives were assessed. The results were compared with those obtained in wind tunnel tests and Theodorsen analytic solutions of the ideal flat plate, and better agreements were found, which confirmed the effectiveness of the proposed numerical method. This numerical model can be applied to identify the flutter derivatives of bridge sections.