Abstract
A narrow strip element is applied in the wake of a circular cylinder in inline oscillation to suppress vortex shedding and reduce fluctuating lift on the cylinder. A non-lock-on mode and three lock-on modes of vortex shedding are found in the wake without element. The results of visualization and spectra analysis of fluctuating velocity in the wake and fluctuating lift on the cylinder show that, the non-lock-on mode and two lock-on modes of vortex shedding can be suppressed, and the fluctuating lift and mean drag on the cylinder can be reduced considerably, if the element is set in effective zones. The influences of Reynolds number, cylinder oscillation frequency, element size, and blockage ratio on the effective zone are investigated, and the suppression mechanism is discussed in the paper.
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