[2019] Two-phase flow induced vibrations in a marine riser conveying a fluid with rectangular pulse train mass > Selected Papers

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[2019] Two-phase flow induced vibrations in a marine riser conveying a…

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Ocean Engineering, Vol.174, pp 71-83, 2019

Two-phase flow induced vibrations in a marine riser conveying a fluid with rectangular pulse train mass

Author(s): José Manuel Cabrera-Miranda & Jeom Kee Paik

Abstract:
A riser conveys fluids from a subsea system to a host floater; however, oil and gas phases may alternate, increasing pipe stress and damaging downstream facilities. This paper studies the nonlinear planar vibrations of a steel lazy wave riser excited by slug flow. The employed formulations comprise the Euler-Bernoulli beam modeland the steady plug-flow model with a time-space-varying mass per unit length in the form of a rectangular pulse train. The equations are solved by a Runge-Kutta finite difference scheme and frequency-response curves are constructed for effective tension, curvature, usage factor and fatigue damage. The results offer a useful insight of the slugging frequencies and slug lengths that may receive attention during the design of risers.

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