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PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Numerical and Experimental Analysis of Hydro-Elastic Problems
O. Bendoau12, A. Makhloufi2, D. Borza2 and A. El Hami2
1Mechanical Department, Mohammadia School of Engineers, Rabat-Agdal, Morocco
O. Bendoau, A. Makhloufi, D. Borza, A. El Hami, "Numerical and Experimental Analysis of Hydro-Elastic Problems", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 42, 2007. doi:10.4203/ccp.86.42
Keywords: fluid-structure interaction, modal superposition, speckle interferometry techniques, stochastic, random variable, perturbation.
In this paper, a step based on modal reduction to solve large stochastic interaction fluid-structure problems is presented. In order to validate the used deterministic numerical method (where the fluid formulation is written in terms of the pressure), a comparison of numerical results with full-field experimental ones is made.
The comprehension of the mechanisms of interactions between a fluid and an elastic solid has a significant importance in several industrial applications. When a structure vibrates in the presence of a fluid, there is interaction between the natural waves of each media: the fluid flow generates a structural deformation and, or the movement of a solid causes the displacement of the fluid. These applications require an effective coupling. In addition, the dynamic analysis of the industrial systems is often expensive from the numerical (CPU) point of view. For the coupling fluid structure finite elements models, the importance of the size reduction becomes obvious because the fluid freedom degrees will be added to those of the structure. A method of condensation will be used to reduce the matrixes size.
One of the principal hypotheses in the use of component mode synthesis method is that the model is deterministic; it is to say that parameters used in the model have a defined and fixed value. Furthermore, the knowledge of variation response of a structure involving uncertain materials, geometrical parameters, boundary conditions, tolerances of manufacture and loading conditions is essential in the global process of conception. In order to do that, the modal condensation method is extended to stochastic analysis for coupled fluid-structure finite element models.
A numerical and experimental vibratory study is based on a plate in the air and in immersion in water. The results of the stochastic study tend to show the effectiveness of the steps followed to condense the system and to take into account the uncertain parameters. The experimental study is realized with the speckle interferometry techniques, so a comparison between the numerical and experimental results is provided.
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