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Flow Induced Excitation On Basic Shape Structures


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S. Franzetti, M. Greco, S. Malavasi & D. Mirauda


Flow induced excitation on basic shape structures S. Franzetti1, M. Greco2, S. Malavasi1 & D. Mirauda2 1 Department I.I.A.R., Politecnico di Milano, Italy. 2Department I.F.A., Basilicata University, Italy. Abstract The study of flow-induced excitation on structures and obstacles is one of the main topics of fluid dynamics related to the practical interests in a large number of engineering applications e.g. aerodynamic, mechanical, civil, naval, etc. New design and project techniques have offered hazardous solutions, resulting in structures that are even more slender and flexible. This has led to a number of situations of self-excited vibration due to the interaction between flow fields and structures. Forces coming from this mechanism depend upon both the incoming flow and the structure motion, giving rise to a strong non-conservative force field, which may eventually lead to a growing structure motion. The aim of this chapter is to offer an overture about the phenomenon of the fluid–structure interaction. Because of the importance that the cylindrical and spherical shapes have in the practical applications and the generalizations that these shapes allow, in this chapter the fluid–structure interaction is mainly referred to these basic shapes. 1 Introduction Flow-induced excitations of bodies, obstacles and structures in steady or unsteady flows, are at present both a relevant field of research as well as the subject of important studies of theoretical and experimental nature. International literature reports several studies and contributions relating to such topics for the quasi two-dimensional systems and are summarized in the works of Sarpkaya [1], Ramberg & Griffin [2], Bearman [3], as well as in the papers of Blevins [4] and Naudascher & Rockwell [5]. From the 1970s up to the 1980s, the research was mainly focused on the study and analysis of flow fields and vortex structures generated downstream of