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RESEARCH PAPERS: Offshore Mechanics

An Experimental Investigation of Forces Induced on Cylinders by Random Oscillatory Flow

[+] Author and Article Information
R. G. Longoria, J. J. Beaman

Department of Mechanical Engineering, College of Engineering, The University of Texas at Austin, Austin, TX 78712

R. W. Miksad

Department of Aerospace Engineering and Engineering Mechanics, College of Engineering, The University of Texas at Austin, Austin, TX 78712

J. Offshore Mech. Arct. Eng 113(4), 275-285 (Nov 01, 1991) (11 pages) doi:10.1115/1.2919931 History: Received November 19, 1990; Revised June 11, 1991; Online June 12, 2008

Abstract

Results are presented from experiments investigating hydrodynamic forces induced on fixed circular cylinders by random oscillatory flows. The oscillatory flow was generated in a water tunnel and the inline and transverse forces induced on the cylinders were measured simultaneously. Analysis of the measured forces shows that significant differences exist when comparing drag and inertia coefficients to those measured under sinusoidal flow conditions, particularly in the inertia/ drag regime of the Keulegan-Carpenter number. The comparison of results for random versus sinusoidal flow conditions generated in the same experimental apparatus quantifies the difference in the physical mechanisms, specifically the vortex shedding and pairing, which influence the induced forces. A study is also made of the dependence of measured force power spectral densities on the statistical Keulegan-Carpenter number, Reynold’s number and on the spectral width of the flow velocity auto-power spectrum.

Copyright © 1991 by The American Society of Mechanical Engineers
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