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中文摘要：
为对弹性支撑方柱的流致横向驰振与涡激振动现象进行研究，利用Fluent软件求解Re=500下的粘性不可压流场，方柱振动模型简化为质量-弹簧-阻尼体系，将Newmark-β方法写入用户自定义函数（UDF）来求解柱体运动方程，方柱和流场之间的非线性耦合作用通过动网格实现．考虑了质量比和折合阻尼对方柱振动的影响，结果得到了低频率比下方柱的驰振现象，方柱的最大驰振位移达到2．5倍边长，观察到方柱由驰振到涡激振动的转化．详细分析不同频率比下柱体的升阻力系数、横向位移特征值和尾流涡结构，获得“拍”和“相位开关”等现象．工程中对自振频率较低的方形结构进行设计时需考虑驰振作用的影响，优先采用不易发生驰振的截面形式．
英文摘要：
The galloping and vortex-induced vibrations of an elastic mounted square cylinder are investigated in this paper. The Reynolds number is kept at 500 for all calculations. The viscous incompressible flow field was calculated by the computational fluid dynamics （CFD） code of Fluent software, then the motion of square cylinder was modeled by a spring-damper-mass system, and the motion equation of the cylinder was solved by writing the Newmark-13 method into the User-Defined-Function （UDF）, moreover, the nonlinear coupling between square cylinder and flow field was carried out through the dynamic mesh technique. Results show that when the influence of mass ratio and reduced damping on flow-induced vibration is taken into consideration, the galloping in low frequency ratio is observed, the maximum oscillations can reach 2.5 times of side length under galloping, and the transition from galloping to vortex-induced vibration is found. Then the characteristic parameters of lift and drag coefficient, transverse displacement and vortex pattern in the wake of the square cylinder in different frequency ratios were studied in detail and the phenomena of ＂beat＂ and ＂phase switch＂ were confirmed. Thus the influence of galloping needs be considered for the design of square structures with low natural frequencies in engineering, and the section types which are not easy to induce galloping should be used in preference.
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