Research Article
Jan 1973
Computer Model of Vortex Shedding from a Cylinder
Publication: Journal of the Hydraulics Division
Volume 99, Issue 1
Abstract
A mathematical model of unsteady flow around a cylinder gives lift, drag, and velocity fluctuations in reasonable agreement with experimental results. Vorticity is represented by element Rankine vortices, which are superimposed on the potential flow around a cylinder to form the boundary layers and separated shear layers. The solution advances timewise from assumed initial conditions. At each time step, every element vortex is moved through a distance equal to the product of its instantaneous translational velocity and a small time increment, determined after stability tests. Concentrated clouds of vorticity form and are shed from the cylinder, with accompanying fluctuations in lift and drag. The total number of element vortices in the model is minimized by replacing each cloud by a single equivalent vortex. Because feedback from the formation region to the separation points is present in the model, it is potentially well-suited to studies of flow around oscillating cylinders.
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Published In
Journal of the Hydraulics Division
Volume 99 • Issue 1 • January 1973
Pages: 155 - 165
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© 1973 American Society of Civil Engineers.
History
Published in print: Jan 1973
Published online: Feb 3, 2021
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Authors
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John R. Chaplin
Asst. Engr., Rendel, Palmer and Tritton, London, England; formerly Research Assoc., Inst. of Hydromechanics, Univ. of Karlsruhe, Germany
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