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Accueil > Actualités > Séminaires > Séminaires 2015

Mardi 8 décembre 2015 à 11h00 en salle K118

Alessandro de Rosis, Postdoctorant au Laboratoire de Mécanique des Fluides et d’Acoustique de l’Ecole centrale de Lyon

Titre/Title : A lattice Boltzmann-finite element approach for fluid-structure interaction

Contact : Achim Wirth (équipe MEIGE)

Résumé/Abstract : Classical approaches to model a fluid flow and its interaction with a submerged body are based on the solution of the Navier-Stokes equations, governing the fluid behavior at a macroscopic scale. Here, in opposition to this approach, the fluid domain is modeled by using the lattice Boltzmann method, thus analyzing the fluid dynamics by a mesoscopic point of view. It has been proved that the solution provided by this method is equivalent to the one of the Navier-Stokes equations for an incompressible flow with a second-order accuracy. The lattice Boltzmann method has been chosen for several reasons, such as its extreme simplicity and the lower involved computational cost. Slender elastic structures idealized through beam finite elements are used to idealize an immersed solid body and its dynamics is predicted by using the Time Discontinuous Galerkin method. Therefore, two different solution procedures are used, one for the fluid domain and the other for the structural part, respectively. These two solvers need to communicate and to transfer several information, e.g. stresses, velocities and displacements. In order to enforce a continuous, effective and mutual exchange of information, a proper coupling strategy has been developed and numerically tested.
The proposed coupled approach has been adopted to simulate different fluid-structure interaction phenomena, e.g. the impact of the hull of a ship on the marine free-surface, blood flow in a deformable vessels, and flapping wings simulating the take-off of a butterfly-like body, among the others. The good results achieved in each application highlight the effectiveness of the proposed methodology to successfully investigate various fluid-structure interaction problems.