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ALE and Fluid Structure Interaction for Sloshing Analysis

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2009
auteur(s) Ozdemir Zuhal; Moatamedi Mojtaba; Fahjan Yasin M.; Souli Mhamed
journal (abréviation) The International Journal of Multiphysics (International Journal of Multiphysics, The)
volume (numéro) 3 (3)
pages 307 – 336
résumé Liquid containment tanks are, generally, subjected to large deformations under severe earthquake conditions due to coupling forces between tank and the contained liquid. The accurate description of these forces is vital in order to diminish or eliminate the potential risk of tank failure during an earthquake. Yet, analytical formulations derived for the seismic analysis of liquid storage tanks are not capable to capture the complex fluid-structure effects since they include many assumptions and simplifications not only for the behavior of fluid and structure but also for the external excitation. On the other hand, an appropriate numerical method allows us to cope with large displacements of free surface of the fluid, high deformations of the structure and correctly predicts the hydrodynamic forces due to the high-speed impacts of sloshing liquid on a tank wall and roof. For this purpose, a new coupling algorithm based on the penalty formulation of finite element method which computes the coupling forces at the fluid-structure interface is developed in this paper. This algorithm is constructed on a two superimposed mesh systems which are a fixed or moving ALE mesh for fluid and a deformable Lagrangian mesh for structure. The fluid is represented by Navier-Stokes equations and coupled system is solved using an explicit time integration scheme. In order to verify the analysis capability of coupling algorithm for tank problems, numerical method is applied for the analyses of a rigid rectangular tank under harmonic excitation and a flexible cylindrical tank subjected to earthquake motion and numerical results are compared with existing analytical and experimental results. Strong correlation between reference solution and numerical results is obtained in terms of sloshing wave height.
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