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RESEARCH PAPERS: Offshore Mechanics

Free Span Vibrations of Submarine Pipelines in Steady Flows—Effect of Free-Stream Turbulence on Mean Drag Coefficients

[+] Author and Article Information
A. To̸rum

Division of Port and Ocean Engineering, Norwegian Institute of Technology, University of Trondheim, Norway

N. M. Anand

National Institute of Oceanography, Goa, India

J. Energy Resour. Technol 107(4), 415-420 (Dec 01, 1985) (6 pages) doi:10.1115/1.3231212 History: Received April 09, 1984; Revised April 19, 1985; Online October 22, 2009

Abstract

In this paper part of the results of a laboratory study related to free span vibrations of submarine pipelines in steady and wave-induced fluid flows are summarized. Tests have been carried out using an elastically supported rigid smooth circular cylinder close to a plane smooth boundary in steady flows with turbulence intensities of 3.4, 5.5, and 9.5 percent for four cylinder gap to diameter ratios, G/D equal to 0.5, 0.75, 1.0, and 3.0. The range of Reynolds numbers based on mean velocity of flow and cylinder diameter was 0.65·104 to 0.35·105 . Effect of turbulence intensity on the mean drag force and vibration amplitudes are discussed.

Copyright © 1985 by ASME
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