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力学学报  2015 

弹性支撑圆柱绕流稳定性分析

DOI: 10.6052/0459-1879-14-307, PP. 874-880

Keywords: 圆柱绕流,系统辨识,降阶模型,涡致振动,稳定性分析

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Abstract:

基于CFD技术,采用系统辨识方法,建立了亚临界雷诺数(ReRe~20时出现.旋转自由度的释放能够进一步降低系统的稳定性,可将临界雷诺数进一步降低至18左右.ROM方法不仅具有很高的效率,而且清晰地指出了弹性系统失稳的根本原因流动模态和结构模态耦合作用导致结构模态失稳所致.因此,失稳状态下系统振荡频率锁定于结构固有频率.基于ROM技术预测的失稳边界与直接CFD/CSD仿真结果吻合,证明了该方法的正确性和精度.

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