Unsteady Fluid Force Acting on Oscillating Square-Section Cylinder
Publication: Journal of Engineering Mechanics
Volume 121, Issue 1
Abstract
The difference between experimentally measured lift forces under dynamic condition and quasi-steady condition is termed as an unsteady force, in this technical note. Analysis shows the magnitude of the unsteady force increases with the maximum angle of incidence, αmax encountered by the square cylinder during a cycle of transverse oscillation in a fairly anticipated manner; the phase between the unsteady force and the cylinder displacement only deviates significantly from zero over the range of 8°≤αmax≤ 16°. In this (αmax) range the unsteady force contributes strongly to the driving force for transverse galloping and cannot be neglected. An attempt had been made to incorporate the unsteady force term into the quasi-steady theory; preliminary results show this leads to an improvement in the agreement between theory and other independent experimental measurements.
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References
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 121 • Issue 1 • January 1995
Pages: 176 - 180
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Jan 1, 1995
Published in print: Jan 1995
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