Numerical study on the influence of synthetic jets on the force characters and flow fields of two tandem circular cylinders
Though synthetic jets can effectively suppress the vortex induced vibration(VIV)of single circular cylinder by changing the vortex shedding pattern in the wake,its control effect on multi-cylin-der structures still needs to be studied.In this work,the influence of synthetic jets issued horizontally and symmetrically arranged in the leeward side of the upstream circular cylinder on the force characters and wake structures of two tandem circular cylinders was investigated by numerical simulation.In nu-merical simulation,the Reynold number of the incoming flow is constant at 150,the position angle of synthetic jets is 45°,the dimensionless distances between centers of two circular cylinders are in the range of 2-10.The results show that synthetic jets issued in horizontal direction can reduce the lift and drag coefficients of both upstream and downstream circular cylinders,but the drag coefficients of both upstream and downstream circular cylinders can be larger than those of the uncontrolled case when the momentum coefficient of synthetic jets is too large.When the momentum coefficient of syn-thetic jets equals 2 and 4,synthetic jets issued in horizontal direction could completely dominate the wake of the upstream circular cylinder and make it perfectly symmetrical,but there are still alternative vortices shedding in the wake of the downstream circular cylinder.
two circular cylinderssynthetic jetsforce characterswake structurestandem
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