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RESEARCH PAPERS: Offshore Mechanics/Ocean Engineering

Vortex Shedding Induced Dynamic Response of Marine Risers

[+] Author and Article Information
F. Rajabi, A. Mangiavacchi

Brown & Root Inc., Houston, Tex. 77001

M. F. Zedan

Daniel Industries, Houston, Tex. 77224

J. Energy Resour. Technol 106(2), 214-221 (Jun 01, 1984) (8 pages) doi:10.1115/1.3231040 History: Received April 19, 1982; Revised January 17, 1984; Online October 22, 2009

Abstract

An analytical model to predict the dynamic response of a riser in regular waves or in current to vortex shedding-induced lift forces is described. The riser is treated as a continuous beam under tension. A modal superposition scheme is used to solve the linearized equation of motion in the frequency domain. The excitation lift force is represented by a harmonic function with a frequency equal to the dominant vortex shedding frequency. Empirical correlations are used to determine the lift coefficients and shedding frequencies along the riser. Lift amplification is considered at or near the “lock-in” conditions. The fluid resistance to riser oscillations is represented by a Morison’s equation-type expression.

Copyright © 1984 by ASME
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