Investigation of the influence of different incoming flow conditions on vortex-induced vibration in a 10:1 rectangular section

The vortex-induced vibration of a 10:1 rectangular prism under various grid-generated inflow conditions is investigated to understand the influence of turbulent flow. A simultaneous vibration-pressure test measures vibration responses and pressure characteristics at various angles of attack, while the fractal theory evaluates the regularity of pressure fluctuations. The surface pressure characteristics with and without vortex-induced vibration are compared to analyze the impact of turbulent flow forms on vortex-induced vibration. The results show that although the mean pressure coefficient follows the same spatial distribution in uniform, spanwise uniform turbulent, and spanwise non-uniform turbulent flows, it is higher under turbulent flow conditions. Uniform and non-uniform turbulent flows alter the unilateral asymmetric pressure fluctuation pattern into a unilateral global fluctuation to suppress the vortex-induced vibration. Additionally, turbulence enhances energy exchange between the section and the airflow.