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采用任意拉格朗日-欧拉(ALE)方法数值模拟圆柱在尾流中的流体诱发振动特性。重点分析了圆柱的动力学响应特性,包括升阻力、位移振幅、拍和锁定等现象;另外也详细分析了圆柱的尾涡结构。研究结果表明,在串列下,大质量比时,圆柱的振动会受到抑制,小质量比时,圆柱的振动则会被放大;较之孤立柱的情形,圆柱共振发生在低于且接近于1.0的频率比带内且不易随质量比的变化发生偏移;小质量比下圆柱振幅及共振带都要比大质量比下的大得多;不同频率比和间距比下,圆柱的动力学特性存在明显的差异,相应的涡脱落模态呈现出2P、P+S和2S模态甚至是2P+S模态,各种模态之间互相竞争促进流固耦合的不断变化发展,导致涡间距和涡街宽度的变化。
Fluid-induced vibration characteristics of cylinders in the wake are numerically simulated using an arbitrary Lagrange-Euler (ALE) method. The dynamic response characteristics of the cylinder are analyzed, including the phenomenon of lift resistance, displacement amplitude, beat and lock, etc. In addition, the vortex structure of the cylinder is analyzed in detail. The results show that when the mass ratio is high, the vibration of the cylinder will be restrained. At the low mass ratio, the vibration of the cylinder will be magnified. Compared with the case of the isolated cylinder, the resonance of the cylinder occurs below and close to 1.0 frequency than the band and the deviation is not easy to shift with the mass ratio; low mass ratio of the cylinder amplitude and resonance band are much larger than the mass ratio; different frequency ratio and pitch ratio, the cylinder dynamics The vortex shedding modes show 2P, P + S and 2S modes and even 2P + S modes. The competition among various modes promotes the continuous development of fluid-solid coupling, leading to the vortex Spacing and vortex width changes.