Static and dynamic analyses for the behaviour of deep sea flexible riser systems are presented. Dynamic relaxation is used to obtain steady state static solutions and initial equilibrium shapes which can be adjusted interactively for design purposes. The dynamic behaviour due to effects of waves and currents from any direction, vessel movements, vortex-shedding and structural damping of the riser systems is traced by a central difference numerical procedure. The analysis considers the interaction of in-line and transverse forces due to waves and currents. The in-line drag coefficient being modified by the vortex-shedding effects which are predicted by calculating the maximum transverse response of the flexible riser.

The results predicted by the numerical analyses are compared with those obtained from model tests in a wave flume using a model riser with significant structural damping and of sufficient scale to induce vortex shedding.

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