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Article

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
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Author to whom correspondence should be addressed.
Appl. Sci. 2017, 7(11), 1166; https://doi.org/10.3390/app7111166
Received: 11 September 2017 / Revised: 31 October 2017 / Accepted: 8 November 2017 / Published: 13 November 2017
(This article belongs to the Special Issue Active Flow Control Technologies for Energy and Propulsive Systems)
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 R e = 3900 is achieved by varying the actuation frequency. The variation in actuation frequency corresponds to a range in Stokes number of 2.4 < S t o < 6.4. The trends in drag coefficient modification largely agree with the findings of past publications, achieving a maximum drag reduction at S t o = 4.9 for a fixed jet Reynolds number of the synthetic jet of R e U ¯ o = 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. View Full-Text
Keywords: active flow control; synthetic jet actuator; computational fluid dynamics; bluff body wake; boundary layer; shear layer active flow control; synthetic jet actuator; computational fluid dynamics; bluff body wake; boundary layer; shear layer
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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. https://doi.org/10.3390/app7111166

AMA Style

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. https://doi.org/10.3390/app7111166

Chicago/Turabian Style

McDonald, Philip, and Tim Persoons. 2017. "Numerical Characterisation of Active Drag and Lift Control for a Circular Cylinder in Cross-Flow" Applied Sciences 7, no. 11: 1166. https://doi.org/10.3390/app7111166

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