The control effects of Vortex-Induced Vibration of bridge deck sections under steady suction are investigated by wind tunnel experiments. The analysis results show that the steady suction efficiently reduces the vortex-induced vibration amplitude, increases the Vortex-Induced Vibration (VIV) critical wind speed, and shortens lock-in wind speed range. The suction arranged on the undersurface near the leeward side of the model shows the best result. To study the mechanism of the steady suction control, the CFD-based numerical analysis is performed aiming at the baseline case and several other cases which have better control effect. The results and analysis demonstrate that the steady suction flow can enhance the A-mode secondary wake instability, and therefore the large scale spanwise vortex is suppressed so as to reduce aerodynamic forces.
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