Suppression and characteristics of flow-induced vibration of rectangular prisms with various width-to-height ratios

In this study, the response characteristics and suppression of flow-induced vibrations of rectangular prisms with various width-to-height ratios were experimentally investigated. The present study focused on rotary oscillation, one of the three types of flow-induced vibration generated in a rectangular prism. The main findings were that (i) there are three types of flow-induced vibration, i.e., vortex excitation, low-speed and high-speed torsional flutter, (ii) the flow-induced vibration occurs due to change in fluctuating pressure on the surface of the prism based on the difference of rolling-up of the shear layer separating from the leading edge of the prism, (iii) the flow-induced vibration can be classified into five patterns depending on the width-to-height ratio, and (iv) the flow-induced vibrations can be most effectively suppressed by placing a normal plate upstream of the prism.