Behavior of vortex-induced vibration of a circular cylinder near a deformable wall with two degrees of freedom in steady flow

Abstract

The behavior of vortex-induced vibration of a two-degree-of-freedom cylinder near a deformable wall in steady flow is investigated experimentally. The typical phenomenon of the two-degree-of-freedom cylinder's VIV is discussed. The influences of initial gap between the cylinder and the wall on the dynamic responses of the cylinder are analyzed. The comparison is made about dynamic responses of the cylinder with one and two degrees of freedom. Experimental results show that the vibration of the cylinder near a deformable wall with a small value of initial gap-to-diameter ratios can generally be divided into two phases. The initial gap-to-diameter ratios have a noticeable influence on the occurrence of transverse vibration. The transverse maximum amplitude of the cylinder with two degrees of freedom is larger than that of the cylinder with one degree of freedom under the condition with the same values of other parameters. However, the vibration frequency of the cylinder for the two degrees of freedom case is smaller than that for the one degree of freedom case at the same value of Vr number.

Freely vibrating circular cylinder in the vicinity of a stationary wall

“…Similar to the trend for A max y =D, as e/D decreases, there is an increase in the U n at which the peak A rms x =D occurs. In Yang et al (2011), peak A rms x =D increases with a decrease in e/D, and a similar increase in U n at which the peak amplitudes occur is observed.…”

“…Yang et al (2008) studied experimentally 2-DoF VIV of near-wall cylinder in the turbulent regime, where they found a decrease in vibration amplitudes with decreasing e/D. Yang et al (2011) compared the dynamic response of cylinder near a deformable wall in both 1-DoF and 2-DoF cases. Yang et al (2009) showed that the dimensionless vibration frequency for smaller e/D of 0.06 and 0.30 are much larger than those for larger e/D of 0.66 and 0.88, respectively, at the same reduced velocity.…”

Two-Dimensional VIV Simulation of a Cylinder Close to a Wall with High Reynolds Number by Overset Mesh

“…While Ur is from 3 to 8, the deviation between the two frequencies is considerable. Yang and Gao discovered a reduction in transverse vibration amplitudes with reducing gap ratio G/D by studying the VIV of a cylinder near a wall in the turbulent regime in an experiment 7) . Yang and Gao discovered experimentally that vibration range increases with reducing mass ratio m*.…”