Based on CFD method, study about the effect of mass ratio on vortex-induced vibration (VIV) concerning rigid cylinder has been carried out. Numerical simulations of 2-degree freedom fluid-structure interaction relating rigid cylinder with mass ratios of 1, 2.4 and 7 have been performed. The relationship between normalized amplitude and reduced velocity about two mass ratios has been presented, as well as the eight-circle cylindrical trajectory, beat and phase switch phenomena. The preliminary research shows that the ‘lock-in’ region relating mass ratio of 1 and 2.4 widens than that relating mass ratio of 7. At the same time, the cross-flow maximum amplitude is larger than the latter, leading to the occurrence of obviously enhanced VIV. In addition, through analyzing the effect of mass ratio on coupling oscillation due to in-line and cross-flow vibrations, it can be found that the effect of in-line vibration on the final vibration form could not be ignored, when the mass ratio is relatively lower, e.g. 1 and 2.4 in this paper. On the other hand, the influence is very small, in the case of higher mass ratio, e.g. 7 in this paper. Finally, ‘2S’ and ‘2P’ vortex shedding modes have also been found in the wake.
陈正寿1,2，赵宗文1，张国辉1，郑武3，颜盛汉4. 质量比对刚性圆柱体涡激振动影响的研究[J]. 振动与冲击, 2017, 36(11): 248-254.
CHEN Zheng-shou1,2, ZHAO Zong-wen1, ZHANG Guo-hui1，ZHENG Wu3，YAN Sheng-han4. Study about the effect of mass ratio on vortex-induced vibration concerning rigid cylinder. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(11): 248-254.
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