摘要
建立一种新的预报并列双圆柱涡激振动响应的经验性模型,根据特定间距比条件下旋涡脱落频率出现分支的现象,提出以两个具有不同固有频率的尾流振子来共同描述结构的近壁尾涡动力特性,同时两个振子均满足van der Pol方程,进而得到结构振子和流体振子的耦合方程组。使用该模型分别对中高质量比和低质量比的并列圆柱涡激振动问题进行数值计算,结果表明,结构的位移响应和最大振动幅值等变化规律与实验结果趋势一致,数值基本吻合。
A new empirical model is established to predict the response of vortex-induced vibration for two side-by-side cylinders in cross-flow. The shedding frequency is divided into two branches at specific spacing ratios. Therefore, the fluctuating nature of the vortex street is modeled by two wake oscillators with different natural frequencies. Meanwhile each wake oscillator satisfies the van der Pol equation, which leads to establish a coupled fluid-structure equation. The model is solved by numerical method based on middle- and high-mass ratio or low-mass ratio and then the structural response is obtained. A comparison with the existing experimental results shows that the features of the transverse displacement response and the maximum vibration amplitude are consistent with the experimental measurements.
出处
《海洋工程》
CSCD
北大核心
2013年第2期11-18,共8页
The Ocean Engineering
关键词
涡激振动
并列双圆柱
流固耦合
尾流振子模型
vanderPol方程
vortex-induced vibration （VIV）
side-by-side cylinders
interaction between structure and fluid
wake oscillator model
van der Pol equation
