발간년도 : [2024]
| 논문정보 |
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| 논문명(한글) |
[Vol.19, No.1] Numerical Study on Vortex Induced Vibration of a Circular Cylinder at High Reynolds Numbers |
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| 논문투고자 |
Sang-Dug Kim, Hyun-Su Kim |
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| 논문내용 |
Vortex shedding from a bluff body in the flow field yields an external force acting on the object. This causes an elastic body to vibrate (VIV, vortex induced vibration) and also affects the evolution of vortices. This interaction between vibrating structures and vortices is being studied in various industrial fields in relation to structural fatigue. VIV is influenced by various system variables such as fluid-to-structure mass ratio, structural stiffness, damping, and surface roughness. Experimental studies were conducted on various structural stiffnesses and damping for a cylinder oscillating perpendicular to the flow in a channel. In many cases, investigations have been conducted on laminar flow with low Reynolds numbers or cases lower than the critical Reynolds number. Turbulence characteristics are not dominant and the shear layer has strong two-dimensional characteristics in such regimes. Previous researches for high Reynolds number, however, are limited. Current investigation was conducted on a circular cylinder moving induced by vortices at various high Reynolds numbers through numerical analyses. In predicting the maximum amplitude of the cylinder vibration, the results of this study showed a good comparison with the experiment at low Reynolds number in the initial branch, but showed some differences from the experiment in the condition where synchronization of vortex shedding and cylinder vibration occurs in lock-in regime. In the ratio of the vibrating frequency and the natural frequency of the cylinder, the prediction of the transition from the initial branch to the upper branch and from the upper branch to the lower branch showed good comparison with the experiment. |
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