MODEL-BASED CONTROL OF VORTEX SHEDDING USING LOW-DIMENSIONAL GALERKIN MODELS (original) (raw)
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2018
The suppression of vortex shedding of a larger circular cylinder by the interference effect of 8 individually rotating wake-control cylinders equally distributed about its center is investigated by means of three-dimensional numerical simulations at a Reynolds number of 10,000. Visualization of the wakes revealed a complex disruption of the vortex tubes for the higher rotation speeds. A consequent reduction in the mean drag of 84% and the fluctuating lift in 89% was obtained when compared with the reference values of a bare cylinder. The power lost to rotate the control cylinders at the highest rotation speed is lower than the power lost by the system due to drag. Configurations of control cylinder that can suppress vortex shedding may produce more efficient suppressors for flow-induced vibrations.
2013
A computational study of the flow past a circular cylinder at low Reynolds number is performed. At this Reynolds number Von Karman vortex shedding wake is observed. To attenuate this wake two actuators that inject fluid or remove fluid from the surface of the cylinder are used. The investigation is performed numerically by solving the Navier-Stokes equations in two-dimensions using OpenFOAM which is an open source code. The code is first validated without actuation on results from the literature for Von Karman vortex shedding at low Reynolds number and then used to study active (open loop) control of vortex shedding to reduce drag and control the vortex strength.