Abstract
A mathematical model for the lateral motion of a marine riser is developed to examine the effect of the internal flow and bending rigidity of the pipe on the dynamic behaviour of the riser. The model includes a steady flow inside the pipe together with other factors such as currents, wave excitation, rig motions, etc. A singular perturbation technique is used to solve the equations of the mathematical model for the risers with a relatively small elastic rigidity.
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