Abstract
Vibrations due to vortex shedding in the wake of a cylinder exposed to a current can create fatigue damage in risers used by the offshore industry to bring oil and gas from the sea floor to the platform or off-loading vessel. Extensive research is conducted in this domain and at the Institut français du pétrole, several models are proposed to predict the fatigue life of such pipes. The methods range from simple modal calculations to fully coupled analysis of the fluid-structure interaction and resolution of the Navier-Stokes equations. Through the Hydlines Project, experiments are conducted to validate the various approaches.
Highlights
If a current impacts on a circular cylinder, fluctuating forces are created due to vortex-shedding in the wake
The focus of the present paper is the risers used in the offshore industry to carry oil from the bottom of the ocean to a floating facility
A review of the work conducted at Institut français du pétrole in collaboration with École supérieure des ingénieurs de Marseille and École polytechnique on vortex-induced vibrations is presented
Summary
If a current impacts on a circular cylinder, fluctuating forces are created due to vortex-shedding in the wake. The displacement of the cylinder under a current is referred to as a vortex-induced vibration (VIV). The industrial interest for VIV is based on the fatigue that a long cylindrical structure can experience. The failure due to VIV was confirmed by real time measurements of riser ball joint angle. The first approach is based on the modal response of the structure; such a method is widely used in the industry since it is fast and provides a simple lifetime estimate. The second, more detailed approach requires solving the structural equation in time together with an equation which models the fluid. The results of a set of experiments on a cable with multiple diameters are described They will provide benchmark cases to validate the different methods
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