Control of vortex-induced vibrations in rectangular plates: The effects of suction position

This study undertakes a systematic numerical simulation to explore the impacts of five distinct suction positions (Jet 1-Jet 5) on flow control and vortex-induced vibration (VIV) suppression for a rectangular plate at a Reynolds number of Re = 26 400. The dimensionless vertical vibration amplitude (A* = A/D, with A denoting the vertical displacement) and aerodynamic forces, including the mean drag coefficient (CD,mean) and root mean square lift coefficient (CL,rms), were analyzed under different suction strategies. The underlying mechanisms governing the amplitude reduction and aerodynamic performance were elucidated through energy input analysis and flow dynamics diagnostics. The results indicate that suction applied at Jet 1-Jet 4 significantly suppresses VIV, with Jet 3 achieving optimal control performance, achieving a 99.87 suppression. In contrast, suction at Jet 5 amplifies the VIV response, increasing Apeak* by 53.2%. Furthermore, all suction configurations improve aerodynamic fluctuation. The Jet 5 produces the most significant reduction in mean drag coefficient, whereas Jet 3 nearly eliminates fluctuating lift forces, achieving a 99.99% suppression. The difference between Jet 3 and Jet 5 highlights the critical role of suction position in modulating flow separation and flow dynamics. This study may offer effective strategies for VIV mitigation and aerodynamic optimization in bluff body flows.