One-way fluid structure interaction of pipe under flow with different boundary conditions
Keywords:Fluid conveying pipes frequency, Fluid structure interaction, Galerkin
This paper deals with the analytical modelisation and the numerical simulation of fluid structure interaction (FSI) phenomena of pipeline. The equations of motions and equilibrium are coupled together taking into account the influence of the fluid flow inside the pipe. The fluid circulating in the pipe has the flexional motion as that of structure. The analytical model is based on the Newtonian approach. The practicability of the calculation model and the effects of fluid-structure interaction are illustrated by calculations for some simple systems, for pipe with boundary condition pinned-pinned. Independently of the analytical method, a numerical modal analysis is realized in the fluid structure configuration. This configuration has been simulated by coupling the two commercial solvers: Fluent code of fluid mechanical (CFD, Computational Fluid Dynamics), and ANSYS classical code of structure mechanical (CSD, Computational structure Dynamics) for pipes with different boundary conditions: pinned-pinned, clamped-pinned and clamped-clamped. We describe the technique used to solve the equations associated in the determination of natural frequencies. For this, we use code ANSYS Workbench where the equations are discritized with finite element method. The results obtained numerically are similar to those obtained by the analytical approach.