Contribution to the Study of a Flow Controlled by a Synthetic Jet

This paper presents an experimental study of flow over a square cylinder oscillating in transverse direction. The Reynolds number selected for present study is 485. Limited study has also been made for two other Reynolds numbers, namely, 295 and 775. The objective of the present study is to modify the near-wake flow structure using actuation of the cylinder for possible reduction in drag force. Transverse oscillations to the cylinder are provided using electromagnetic actuators. The flow field is investigated using two-dimensional (2D)-particle image velocimetry (PIV) system, hotwire anemometer (HWA), as well as flow visualization techniques. The effect of oscillation frequency and the amplitude on parameters like Strouhal number, drag coefficient, recirculation length, power spectrum, and Reynolds stress are studied. It is observed that the recirculation length is reduced significantly with increase in forcing frequency, and consequently drag coefficient is also reduced. For a constant forcing frequency, the vortex strength is reduced with the increase in the amplitude. Further, variation of instantaneous spanwise vorticity shows that separated shear length decreases with increase in forcing frequency. As a result, vortices are moved closer to the cylinder. These phenomena affect the forces acting on the cylinder. Lock-on is also observed at a frequency close to the vortex shedding frequency of the stationary cylinder.

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Experimental Investigation of Flow Over a Transversely Oscillating Square Cylinder at Intermediate Reynolds Number

Chauhan

Dutta

Gandhi

et al. 2016

Journal of Fluids Engineering

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Effect of Bio-Inspired Modification on Fluid-Structure Interaction and Its Control: A Review

Sharma,

Dutta

2024

J Flow Vis Image Proc

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Bio-inspired surfaces have been a relevant field of study in recent years. This review aims to synthesize and evaluate the research on passive and active modifications to help develop a new approach to work in this area and stimulate further research. The review elaborates on flow interactions with control structures such as riblets, flexible geometry, and synthetic jets for practical applications. Experiments have confirmed that minor alterations in the near-wall region could affect the wall shear drag produced by the boundary layer. Biomimetic riblets have shown a significant amount of drag reduction. A review of the performance studies of riblets is discussed, along with the effect of geometric and flow parameters. In addition, the flow dynamics involved in flexible structure for thrust generation could be understood from this review. Active control analysis using synthetic jet actuators has shown potential promise in aerodynamic applications. The literature indicates that understanding the leading edge vortex (LEV) is essential for natural fliers study. Alteration of LEV on a flapping wing using active control techniques has also been summarized.

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Contribution to the Study of a Flow Controlled by a Synthetic Jet

Cited by 2 publications

References 5 publications

Experimental Investigation of Flow Over a Transversely Oscillating Square Cylinder at Intermediate Reynolds Number

Experimental Investigation of Flow Over a Transversely Oscillating Square Cylinder at Intermediate Reynolds Number

Effect of Bio-Inspired Modification on Fluid-Structure Interaction and Its Control: A Review

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