Flows are powerful sources of energy. Structures subjected to them can experience intense vibrations, which may lead to catastrophic failures through wear or fatigue.
This lecture constitutes an informal view of the essential features of Flow-Induced Vibrations (FIV) in nuclear facilities, starting with the essential distinction between forced vibrations and flow/structure coupling phenomena. The first case being typically connected with flow turbulence excitation, while the second case is the source of many fluidelastic instabilities, at the root of costly - and often spectacular - structural or component failures. A third case, connected with vortex-shedding excitation, lays somewhere in-between the previous two.
The basic phenomena in FIV will be introduced and clarified through illustrative examples of practical interest in nuclear components. Theoretical modelling techniques to address the various problem aspects will be presented and applied to representative problems, stemming from the lecturer's personal activity. In spite of the insight provided by current theoretical models and the increasingly credible CFD results, FIV is still very much an experimental field. The identification of turbulence and fluidelastic forces will be discussed, as well as aspects which need further understanding and are very much topics of current research.
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Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.
