Offshore and Structural Mechanics

A Finite Element Analysis for Unbonded Flexible Risers Under Torsion

[+] Author and Article Information
A. Bahtui, H. Bahai, G. Alfano

School of Engineering & Design, Brunel University, London UB8 3PH, UK

J. Offshore Mech. Arct. Eng 130(4), 041301 (Sep 24, 2008) (4 pages) doi:10.1115/1.2948956 History: Received July 19, 2007; Revised November 21, 2007; Published September 24, 2008

This paper presents a detailed finite-element analysis of unbonded flexible risers. The numerical results are compared to the analytical solutions for various load cases. In the finite-element model, all layers are modeled separately with contact interfaces between each layer. The finite-element model includes the main features of the riser geometry with very little simplifying assumptions made. The numerical model was solved using a fully explicit time-integration scheme implemented in a parallel environment on a 16-processor cluster. The very good agreement found from numerical and analytical comparisons validates the use of our numerical model to provide benchmark solutions against which further detailed investigation will be made.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Five-layer unbonded flexible riser

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Figure 2

Detailed geometry of riser

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Figure 3

Torsion in opposite direction of a typical unbonded flexible riser

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Figure 4

Rotation at the top reference node of a five-layer unbonded flexible riser

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Figure 5

Torsion versus time, for the case of cyclic loading

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Figure 6

Torsion versus rotation, for the cyclic loading case



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