Vortex-induced vibration of two tandem circular cylinders with different diameters under low Reynolds number (Re = 200) is investigated numerically by solving the uncompressible two-dimensional Navier–Stokes equations. The arbitrary Lagrange–Euler method is used to simulate the movement of mesh. Effects of diameters and gap ratios are considered. Numerical results show that diameter ratios and gap ratios have little effect on maximum vibration amplitude. Four different vortex shedding modes are detected in this study.

中文翻译：

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两个不同直径串联圆柱体涡激振动的数值研究

通过求解不可压缩的二维 Navier-Stokes 方程，数值研究了在低雷诺数 (Re = 200) 下两个不同直径串联圆柱体的涡激振动。任意拉格朗日-欧拉方法用于模拟网格的运动。考虑了直径和间隙比的影响。数值结果表明，直径比和间隙比对最大振动幅值影响不大。本研究检测到四种不同的涡旋脱落模式。