One of the difficult challenges that engineers encounter nowadays is the Vortex Induced Vibration (VIV). VIV occurs when a bluff body is subjected to external fluid flow. Vortices shed from the structures cause bluff bodies to oscillate. This oscillation can lead to failures of the structures. With the recent development of computing technologies, VIV have been caught attention by many researchers. Although, extensive research has been done until now, there are still research areas to be investigate on VIV.
In this study, one of the most important parameters of VIV, which is damping of the structure, is investigated and the results are compared with the experimental study of the previous research. The simulations are done with 2D cylindrical cross-section structure that is free to move in transverse direction. Overall, a good agreement is achieved between the experimental and the numerical results. The three key parameters, namely; the dimensionless amplitude, frequency ratio, which is the frequency of the displacement over the natural frequency, and the phase change of each reduced velocity are shown. It is concluded that the response of the amplitude decreases with the increased damping of the structure and a shift occurs in the beginning of the lock-in region with increasing damping.
Anahtar Kelimeler: Computational Fluid Dynamics, Vortex-Induced Vibration, URANS Method, Damping
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