Passive Jet Approach to Control the Flow over a Circular Cylinder
Publication: Journal of Aerospace Engineering
Volume 33, Issue 3
Abstract
A numerical investigation was conducted on a passive jet flow control method for alleviating unsteady wake oscillation behind a circular cylinder. The study focused on the effects of two crucial parameters—the number of jet holes in a pipe and the radial thickness of a pipe—on the aerodynamic forces acting on a circular cylinder and alternating vortex shedding in the wake. Pressure coefficient distributions, aerodynamic coefficients, vorticity distributions, probability density functions of wake velocities, and production of turbulent kinetic energy were analyzed in detail. Both the fluctuating lift force and the mean drag force acting on the model decreased with an increase in the jet momentum coefficient. The optimal parameters were a 13-hole pipe and a 5% ratio of pipe radial thickness to the cylinder diameter. Under the optimal parameters, fluctuating lift was reduced by 99.57% with a mean drag reduction of 32.41% compared with a bare cylinder. The fluctuating wake of the circular cylinder was almost eliminated. The alternating vortex shedding was converted into two parallel shear layers, and the asymmetric vortex shedding mode was shifted into a symmetric wake mode. The probability density function of the fluctuating transverse velocity in the wake shrank without wide tails, because the production of turbulent kinetic energy in the wake was reduced by over one order of magnitude, which is the intrinsic nature of this passive method to effectively suppress the aerodynamic forces on a circular cylinder and wake oscillation.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request. The items are as follows:
1.
All original data for Cases H0, H1, H3, H5, H7, H9, H11, and H13, which were calculated by ANSYS Fluent.
2.
All original data for Cases T0125, T0250, T0500, T0750, T1000, and T1500, which were calculated by ANSYS Fluent.
Acknowledgments
This work was funded by the National Key Research and Development Program of China (Grant No. 2016YFC0701107), the National Natural Science Foundation of China (Grant Nos. 51578188, 51978222, and 51722805), and the Fundamental Research Funds for the Central Universities (Grant No. HIT. BRETIII. 201512).
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Information & Authors
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Published In
Journal of Aerospace Engineering
Volume 33 • Issue 3 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Apr 21, 2019
Accepted: Nov 6, 2019
Published online: Mar 12, 2020
Published in print: May 1, 2020
Discussion open until: Aug 12, 2020
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