ABSTRACT
In the contact between a flowing process fluid and a body with containment or structural functions, mechanical, thermal, and chemical interactions are always present, their relevance depending on the specific case. A flowing fluid and the structure which envelopes it is systems interacting dynamically through the forces that the fluid exerts on the structure. The research on fluid-structure interactions is presently oriented to the study of experimental data available for real operation conditions, in order to characterize geometrical parameters and flow conditions which influence the threshold of the vibratory phenomenon. Turbulent flows are characterized by oscillations of the main fluidodynamic parameters over a wide frequency range. If a cylinder enclosed in a cavity is interested by a flow-induced vortices formation, the sound waves produced by the vortice cascade are reflected by the containment walls. The vibration of tubes in a parallel, turbulent flow is a frequent problem in heat exchangers and in nuclear reactors.
