Slit Effectiveness Analysis on the Lift Fluctuation Caused by Low-Speed Laminar Flow over a Circular Cylinder
Publication: Journal of Aerospace Engineering
Volume 35, Issue 2
Abstract
Low-speed laminar flow over a slotted circular cylinder was numerically studied to investigate the slit effectiveness on the vortex shedding suppression and also determine the suppression mechanism physically. The base flow is two dimensional and characterized by . The base slit was cut along the cylinder diameter in parallel to the upcoming flow. The effect of the slit width was studied and compared with previous reported results. Obtained results showed that the lift suppression increased with the slit-width increment so that there was no optimum slit width at this particular flow regime. Considering the strength of the structure, the slit with width of 20% of the cylinder diameter approximately suppresses the lift fluctuation completely and decreases the mean drag coefficient by 5%. Computed results showed that the slit induced additional stagnation points on the surface of the cylinder, which made the primary separation bubbles remain attached to the cylinder. These attached separation bubbles form a stable near-wake and a milder periodic vortex shedding at the far-wake regions. Additionally, other slit configurations were proposed and studied to confirm the proposed physical theorem.
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Data Availability Statement
All available data are included in the article.
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Published In
Journal of Aerospace Engineering
Volume 35 • Issue 2 • March 2022
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© 2021 American Society of Civil Engineers.
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Received: Jul 7, 2021
Accepted: Nov 5, 2021
Published online: Dec 30, 2021
Published in print: Mar 1, 2022
Discussion open until: May 30, 2022
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