Vortex-induced vibration annihilation of two-degree-of-freedom circular cylinder by rotational oscillations

Author

Arak University of Technology

Abstract

In this paper, an active control strategy based on the cylinder forced rotary oscillation is considered to reduce the flow-induced vibration of an elastically mounted two-degree-of-freedom circular cylinder free to vibrate in both transverse and in-line directions. The fluid flow governing equations are two-dimensional incompressible Navier-Stokes model which discretized by means of the finite volume method. The frequency ratio〖 f〗_rot/f_n, and rotation rate α, are two important adjustable parameters which must be selected in such a way that the vortex shedding frequency locked on associated rotational forcing frequency, and the cylinder transverse and in-line vibrations will be suppressed accordingly. Based on comprehensive simulations accomplished in this paper, three different active open-loop control systems is selected in order to effectively reduce the cylinder vibrations for reduced velocities in synchronization region with the following input parameters: (for V_r=5: α=1,f_rot/f_n=1.1), (for V_r=6: α=1,f_rot/f_n=1.3), and (for V_r=7: α=1,f_rot/f_n=1.5). These three control systems are found to decrease the maximum transverse cylinder vibration amplitudes by 88%, 92%, and 92% while the corresponding in-line vibration amplitudes decrease by 93%, 90%, and 82%, respectively.

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References

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Journal of Solid and Fluid Mechanics
Volume 9, Issue 2
June 2019
Pages 95-108

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