Etude dynamique linéaire et non linéaire d’une poutre couplée avec un fluide
Keywords:
fluid-structure interaction, finite element coupling, modal analysis, non linear temporal analysis, mode coupling, added massAbstract
This paper deals with dynamic study of an elastic beam coupled to an incompressible fluid with free surface. To begin with, a modal analysis of the coupled fluidstructure problem by finite element coupling is carried out. Fluid-structure interaction effects are highlighted. Then, a dynamic analysis is performed, using a non-linear model in which the geometric non-linearity due to the axial force generated by stretching of the middle surface is taken into account. The coupled fluid-structure system is subjected to an imposed transverse acceleration. The problem is solved with a finite element method with a non-linear implicit scheme, the fluid effects are taken into account with an added mass operator which is discretised with a finite element technique. A numerical study is then carried out and shows the effect of geometrical non linearity as the imposed acceleration amplitude is increased. A comparison of non-linear behavior with fluid coupling is then investigated.
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