Effect of Sound on Vortex Oscillation of a Cylinder

Abstract

In the paper, a rectangular cylinder is employed to investigate the effect of sound on suppressing vortex oscillation. Vortex induced oscillations appearing at rectangular sections are mainly caused by unsteady separated flow from the leading edges. If the separated flow from the leading edge is controlled, vortex oscillation may be suppressed. So that sound excitation was only applied at the leading edge of rectangular cylinder in these experiments. The experimental results show that vortex oscillation of the cylinder was reduced significantly by sound excitation at a specific frequency.