Numerical Characterisation of Active Drag and Lift Control for a Circular Cylinder in Cross-Flow
Department of Mechanical and Manufacturing Engineering, Parsons Building, Trinity College, Dublin 2, Ireland
Author to whom correspondence should be addressed.
Received: 11 September 2017 / Revised: 31 October 2017 / Accepted: 8 November 2017 / Published: 13 November 2017
Synthetic jet actuators have shown promise to control drag and lift for a bluff body in cross-flow. Using unsteady RANS CFD modelling, a significant modification of the drag coefficient for a circular cylinder in cross-flow at
= 3900 is achieved by varying the actuation frequency. The variation in actuation frequency corresponds to a range in Stokes number of 2.4 <
< 6.4. The trends in drag coefficient modification largely agree with the findings of past publications, achieving a maximum drag reduction at
= 4.9 for a fixed jet Reynolds number of the synthetic jet of
= 12. A decrease in the adverse pressure gradient near the jet orifice correlated with a momentum increase in the viscous sublayer and stronger vortical structures at the rear of the cylinder. In these same conditions, a decrease in turbulence intensity was observed in the far field wake, which is a relevant finding in the context of wind and tidal turbine arrays.
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MDPI and ACS Style
McDonald, P.; Persoons, T. Numerical Characterisation of Active Drag and Lift Control for a Circular Cylinder in Cross-Flow. Appl. Sci. 2017, 7, 1166.
McDonald P, Persoons T. Numerical Characterisation of Active Drag and Lift Control for a Circular Cylinder in Cross-Flow. Applied Sciences. 2017; 7(11):1166.
McDonald, Philip; Persoons, Tim. 2017. "Numerical Characterisation of Active Drag and Lift Control for a Circular Cylinder in Cross-Flow." Appl. Sci. 7, no. 11: 1166.
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