Heave-imposed Motion in Vertical Risers: A Reduced-order Modelling Based on Bessel-like Modes

The heave-imposed excitation in vertical risers is a problem of scientific and technological interest, since it can lead to parametric instabilities on one hand, and fatigue failure with disastrous environmental and financial consequences on the other. The paper addresses a reduced-order analytical model of risers using Bessel-like modes as projecting functions and compares its dynamical response to experimental results from a towing tank test.