A Parametric Study of Active Control of Hydrodynamic Forces over a Cylinder using Fluidic Actuators

Vortex shedding past a bluff body causes fluctuating forces on the structure leading to vortex-induced vibrations (VIV). We develop a POD-based reduced-order model of the flow past a circular cylinder using flow snapshots obtained from two-dimensional simulations. The reduced-order model is then modified to apply a control strategy using a control function method. We introduce suction through fluidic actuators placed symmetrically close to flow separation points. We design a full-state feedback controller using the reducedorder model and compute appropriate gains to reduce the hydrodynamic forces on the cylinder. We then use fluidic actuation obtained from the controller in the CFD simulation and observe suppression of vortex shedding. To verify the performance of the controller, we use the same controller at different Reynolds numbers and compare the lift and drag forces on the cylinder.