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High Mode Vortex Induced Vibration (VIV) Experiments on a Large-Scale Riser


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Murrin, D, Ordonez, M, Stone, G, Bose, N and Qiu, W 2007 , 'High Mode Vortex Induced Vibration (VIV) Experiments on a Large-Scale Riser', paper presented at the On the Edge of Tomorrow - MTS/IEEE Oceans 2007, 2-3 October 2007, Vancouver.

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The focus of this research is on the development
and testing of a large-scale model riser (130 m in length)
undergoing high mode vortex induced vibrations (VIV) in the
ocean environment. This large scale model will provide an
intermediate step between the common riser models (8-10 m
in length) that have mainly been used to research VIV to date
and the actual 3,000+ m deepwater risers being used in industry
During offshore drilling operations, marine risers carry mud
and debris from below the sea floor, and during production
operations they are responsible for transporting oil or gas from
the hydrocarbon reservoir to the surface platform. The integrity
of a marine riser is therefore critical to the success of offshore
drilling and production.
The flow of seawater around marine risers is subject to vortex
shedding which excites oscillations known as Vortex Induced
Vibrations (VIV). When the VIV frequency approaches one of
the natural frequencies of the structure, resonance, or lock-in
occurs. This results in enhancement of the vibration amplitude of
the structure and may have potentially destructive consequences
due to high bending stresses and fatigue damage of the riser. At
present, the prediction of this phenomenon is one of the most
challenging areas in the offshore industry.
In experimental investigations of VIV, large aspect ratio risers,
namely long cylinders with relatively small diameters, pose a
modeling challenge. This paper focuses on the development of a
large-scale model riser capable of transmitting data in real-time
under realistic operating conditions.

Item Type: Conference or Workshop Item (Paper)
Authors/Creators:Murrin, D and Ordonez, M and Stone, G and Bose, N and Qiu, W
Keywords: VIV, marine riser, deep water
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