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Title: Unsteady fluid force acting on oscillating square-section cylinder
Authors: Luo, S.C. 
Chew, Y.T. 
Goh, E.Y.
Issue Date: Jan-1995
Citation: Luo, S.C., Chew, Y.T., Goh, E.Y. (1995-01). Unsteady fluid force acting on oscillating square-section cylinder. Journal of Engineering Mechanics 121 (1) : 176-180. ScholarBank@NUS Repository.
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.
Source Title: Journal of Engineering Mechanics
ISSN: 07339399
DOI: 10.1061/(ASCE)0733-9399(1995)121:1(176)
Appears in Collections:Staff Publications

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