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RESEARCH PAPERS: Other Research Papers

Frequency Domain Analysis of In-Line Forces on Circular Cylinders in 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 115(1), 23-30 (Feb 01, 1993) (8 pages) doi:10.1115/1.2920084 History: Received August 31, 1991; Revised August 06, 1992; Online June 12, 2008

Abstract

Experiments were conducted to study random hydrodynamic loading of smooth, rigidly mounted circular cylinders exposed to random oscillatory flow conditions. The experiments were conducted in a water tunnel for statistical Keulegan-Carpenter numbers ranging from KCr = 6.8 to 11.6 and statistical Reynold’s numbers from Rer = 8211 to 20169 under broad and narrow-band flow conditions. A two-input/single-output frequency domain model for the in-line force is used to directly identify frequency-dependent inertia and drag coefficients. This model was also used to show the relative strength of the inertia and drag components in the frequency domain for different random flow conditions parameterized by KCr , Rer and the velocity spectral width, q . This analysis illustrates the effect of statistical flow parameters (KCr , Rer and q ) on the nonlinear behavior of the in-line forces. Estimates of the in-line force power spectral density under random flow conditions are determined using the two-input/single-output model and compared to the method for estimating wave forces on a cylindrical structure by Borgman (1967, 1972).

Copyright © 1993 by The American Society of Mechanical Engineers
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