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Research Papers: Piper and Riser Technology

Experimental and Numerical Study of Wake Interference and Clashing Between Steel Catenary Risers

[+] Author and Article Information
E. Fontaine

e-mail: emmanuel_fontaine@me.com

J. Capul

IFP,
1 et 4 avenue de Bois Préau,
92852 Rueil Malmaison, France

T. Rippol

Océanide,
Z.I. de Brégaillon, BP 63,
83852 La Seyne/Mer, France

P. Lespinasse

TOTAL,
Tour Coupole,
2 Place de Coupole
92078 Paris la Defense, France

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received January 10, 2010; final manuscript received January 19, 2011; published online February 22, 2013. Assoc. Editor: Rene Huijsmans.

J. Offshore Mech. Arct. Eng 135(1), 011701 (Feb 22, 2013) (8 pages) Paper No: OMAE-10-1009; doi: 10.1115/1.4007328 History: Received January 10, 2010; Revised January 19, 2011

The aim of this work is to estimate the risk of clashing between steel catenary risers (SCRs) due to wake interference. More generally, the validity of clearance analysis between risers as recommended by design codes is discussed. Considering the complexity of the problem, theoretical, numerical, and experimental approaches have been used jointly. Similitude rules have been investigated to reproduce wake induced oscillations (WIO) at model scale. Different regimes have been identified (stable, unstable, and critical) depending on the intensity and effects of WIO. The validity of steady wake models used in the industry is discussed in view of the experimental data. Finally, onset criteria for WIO and clashing are proposed based on comparison between experimental and numerical results.

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References

Figures

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Fig. 1

Global view of the basin BGO/First La Seyne/Mer

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Fig. 2

Detailed view of the riser model test internal structure

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Fig. 3

Side view of the convergent in the basin

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Fig. 4

General layout in the model basin (view from downstream), including instrumentations: accelerometers, underwater trajectometry, force measurement (riser top)

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Fig. 5

General layout (top view), including optical system used to measure risers displacement

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Fig. 8

Unstable regime with few clashing events

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Fig. 10

Acceleration versus time. Peaks corresponding to clashing events are clearly identified.

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Fig. 11

Wake model implemented into FEM assuming strip theory

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Fig. 12

Drag coefficient on the upstream (top) and downstream (down) cylinder in a tandem configuration versus spacing and Reynolds number (reproduced from [10])

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Fig. 14

Stable (green) versus unstable (blue) region in the wake. Experimental data point: critical regime (red), unstable (orange), and stable (yellow).

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Fig. 13

Comparison between experimental (top) and numerical (bottom) results for the flow regime: stable (yellow), unstable (orange), and critical (red)

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