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RESEARCH PAPERS: Offshore Mechanics and Arctic Engineering

In-Line Forces on Vertical Cylinders in Deepwater Waves

[+] Author and Article Information
T. H. Dawson

Department of Naval Systems Engineering, U.S. Naval Academy, Annapolis, MD 21402

J. Energy Resour. Technol 107(1), 18-23 (Mar 01, 1985) (6 pages) doi:10.1115/1.3231156 History: Received March 14, 1984; Revised June 25, 1984; Online October 22, 2009

Abstract

Laboratory measurements of the total in-line forces on a fixed vertical 2-in-dia cylinder in deep-water regular and random waves are given and compared with predictions from the Morison equation. Results show, for regular waves with heights ranging from 2 to 22 in. and frequencies ranging from 0.4 to 0.9 Hz that the Morison equation, with Stokes wave theory and constant drag and inertia coefficients of 1.2 and 1.8, respectively, provides good agreement with the measured maximum wave forces. The force variation over the entire wave cycle is also well represented. The linearized Morison equation, with linear wave theory and the same coefficients likewise provides close agreement with the measured rms wave forces for irregular random waves having approximate Bretschneider spectra and significant wave heights from 5 to 14 in. The success of the constant-coefficient approximation is attributed to a decreased dependence of the coefficients on dimensionless flow parameters as a result of the circular particle motions and large kinematic gradients of the deep-water waves.

Copyright © 1985 by ASME
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