Influence of transported fluid on behavior of an extensible flexible riser/pipe

Abstract

The influence of fluid transported inside a riser/pipe on the riser/pipe behavior is investigated. The riser/pipe considered is extensible, flexible and experiencing large displacements. The present work is an extension of the previous study by the authors of the effect of axial deformation on natural frequencies of marine cables (paper presented at ISOPE-97). The two-dimensional model used in that study is modified by adding the virtual work done by the inertia force of transported fluid mass. Equations of motion of the system are obtained and numerical examples are given to demonstrate this influence for the case of steady transporting state.