Suppression of Vortex-induced vibration of a circular cylinder with a pair of curved plates

Abstract

A pair of curved plates are installed behind the cylinder to suppress the VIV response of the cylinder. The effects of the distances (e = 1D, 2D, 3D and 6D) between the cylinders and the curved plates and plate lengths (L = 0.1D, 0.5D and 1D) on the VIV response are simulated by combining k-ω SST turbulence models and uRANS equations. The accuracy of the numerical simulation is verified by comparison with the experiment data. The results show that when e = 3D, the curved plate has the best vibration suppression effect on the VIV response. The maximum amplitude ratio is 0.56, which is 42% less than that of the bare cylinder (0.98). When e = 1D, the curved plates enhance the VIV response. Especially in the lower branch, the amplitude ratio reaches 0.93, which is far greater than that of the bare cylinder. In addition, when U*>10, the cylinder with a pair of curved plates exits the lock-in region. Besides, the vibration suppression effect of plate length on cylinder is further studied. When L = 1D, the curved plate has the best vibration suppression effect on the cylinder. The maximum amplitude ratio is 0.37, which is 62% less than that of the bare cylinder.