Flow-induced vibration is an important concern in the design of tube bundles.
Due to the coupling of fluid motion and structural motion, instabilities such as
flutter and divergence can arise. Next to the instabilities caused by the coupling of fluid
motion and structural motion, turbulence could cause small amplitude vibrations, which
in turn could give rise to long-term damage. Currently, the dynamical behavior of a tube
in axial flow is studied by splitting the flow forces into inviscid and viscous components.
The inviscid flow forces are determined from potential flow theory while the viscous flow
forces come from empirical formulations.
In this paper, a computational methodology is proposed to improve the accuracy of the
predicted dynamical behaviour. In this methodology partitioned fluid-structure interaction
simulations are performed to calculate the free vibration decay of a tube in axial
flow. The tube is initially deformed according to an eigenmode in vacuum. Modal characteristics
are then derived from the free vibration decay of the tube surrounded by the
turbulent water flow. To validate this computational methodology a series of experiments
is reproduced. In these experiments the frequency and damping of the fundamental mode
of a solid brass cylinder were measured
