Numerical analysis of WIV phenomenon with two in-series cylinders: WIV suppression and energy harvesting

Abstract

Arranging an elastic bluff body in the wake of a fixed upstream bluff body can cause wake-induced vibration (WIV), which includes various hydrodynamic characteristics. This paper numerically studies a dynamic response of the downstream vibrating cylinder with another cylinder fixed upstream under different spacing ratios (α𝛼) and radius ratios (φ𝜑) of a series of circular cylinders and a series of square cylinders. The results show that as the spacing ratio increases, the series of square-cylinder system can effectively suppress vibration within the interval of α𝛼 = 5.3 - 5.7, 6 ≤ Ur ≤ 8. Subsequently, the influence of different radius ratios has been studied. It is found that as the radius ratio increases, the vibration of the downstream square cylinder transit from VIV to galloping. Besides, it can be found that the power at φ𝜑 = 2 is higher than that in the other two cases, and the power when α𝛼 = 6 is much greater than that of the case α𝛼 = 8 and 4. Finally, the short-time Fourier transform and wavelet transform have been employed to perform time-frequency analysis of different cases with changing the radius ratio. It is shown that the frequency characteristics of the series square-cylinder system are more complicated than those of the circular-cylinder system.

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ORCID for Daniil Yurchenko: orcid.org/0000-0002-4989-3634

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