论文部分内容阅读
对一座大桥长吊杆索的尾流驰振问题进行了数值研究。基于Reynolds平均的非定常N-S方程和SSTk-ω湍流模型,采用商业CFD软件FLUENT对串列双吊杆索的绕流流场进行了数值模拟,得到了不同工况下下游吊杆索气动力的瞬时值、时间平均值及其气动导数。在此基础上进行的上游吊杆索尾流中的下游吊杆索的稳定性分析发现,在设计参数下,当攻角较大和较小时是稳定的,但在攻角的中间范围是不稳定的,会发生尾流驰振现象。该结果与传统理论一致,为该桥的增设阻尼器的必要性提供了依据。
A numerical study on wake oscillation of a long boom cable is carried out. Based on Reynolds average unsteady Navier-Stokes equations and SSTk-ω turbulence model, a commercial CFD software, FLUENT, was used to simulate the flow around a tandem double suspension cable. The aerodynamic characteristics of the downstream boom cable were obtained under different operating conditions Instantaneous values, time averages and their derivatives. Based on the analysis of the stability of the downstream boom cable in upstream boom cable wake, it is found that when the angle of attack is larger and smaller at design parameters, it is stable, but the range of mid-angle of attack is unstable The phenomenon of wake galloping will occur. The result is consistent with the traditional theory and provides the basis for the necessity of adding a damper to the bridge.