Effects of circular cylinder rotating ratios on wake vortex suppression using OpenFOAM
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Columnar structures are widely used in wind, offshore and marine engineering. These structures are often subjected to vortex-induced vibrations (VIV), which can lead to fatigue damage in severe cases. In this study, the open-source software Open- Source Field Operation and Manipulation (OpenFOAM) is used to simulate fluid flow around a rotating circular cylinder and examined the effects of different rotation ratios on the wake of the cylinder. The objective of this study is to explore the possibility of suppressing vortex-induced vibrations by controlling the swirling flow around the cylinder. Our large-eddy simulation (LES) results show that the streamwise turbulent flow exhibits non-linear changes as the cylinder’s rotation ratio increases. The vortex structure weakens and becomes less coherent as the cylinder’s rotating speed increases, and the influence of spanwise vortices diminishes. Furthermore, as the rotating ratio(α) increases, the lift coefficient shows an overall rising trend, whereas the drag coefficient initially decreases and then gradually increases. The Strouhal number decreases and eventually reaches zero, indicating that vortex shedding is effectively suppressed. In summary, generating a swirling flow around the cylinder by rotation can effectively suppress the formation and periodic shedding of vortices from the cylinder.
Abstract
Columnar structures are widely used in wind, offshore and marine engineering. These structures are often subjected to vortex-induced vibrations (VIV), which can lead to fatigue damage in severe cases. In this study, the open-source software Open- Source Field Operation and Manipulation (OpenFOAM) is used to simulate fluid flow around a rotating circular cylinder and examined the effects of different rotation ratios on the wake of the cylinder. The objective of this study is to explore the possibility of suppressing vortex-induced vibrations by controlling the swirling flow around the cylinder. Our large-eddy simulation (LES) results show that the streamwise turbulent flow exhibits non-linear changes as the cylinder’s rotation ratio increases. The vortex structure weakens and becomes less coherent as the cylinder’s rotating speed increases, and the influence of spanwise vortices diminishes. Furthermore, as the rotating ratio(α) increases, the lift coefficient shows an overall rising trend, whereas the drag coefficient initially decreases and then gradually increases. The Strouhal number decreases and eventually reaches zero, indicating that vortex shedding is effectively suppressed. In summary, generating a swirling flow around the cylinder by rotation can effectively suppress the formation and periodic shedding of vortices from the cylinder.