variavel0=<b>ALESSANDRO R. E. ANTUNES</b> - darlan@demec.ufpe.br UFPE
<b>Darlan K. E. Carvalho</b> - darlan@demec.ufpe.br UFPE
<b>Paulo R. Maciel Lyra</b> - prmlyra@demec.ufpe.br UFPE
<b>Abstract.</b> In the present work we treat problems involving fluid-structural coupling and especially the study of vortex induced vibrations (VIV), where a rigid body interacts with the flow that is modeled as incompressible. A Petrov-Galerkin formulation of the finite element method is used to perform the spatial discretization of the incompressible Navier-Stokes equations that are described through a mixed "ALE" (Arbitrarian Lagrangean Eulerian) formulation. The structure being studied consists in a circular rigid cylinder supported by elastic springs. It is also exploited the fact that the unstructured mesh generator utilized allows for the previous definition of multiple subdomains, where the meshes can be generated in a consistent and independent way. Besides it is also capable of generating meshes with stretched elements within the boundary layers regions. The existence of multiple subdomains allows for the use of different strategies to deal with each of them, where the different formulations (ALE with or without mesh deformation and Eulerian) are used, which has serious implications in the accuracy and computational efficiency. Over the subdomains with ALE formulation, with the dynamic deformable mesh, when the quality of the mesh elements is too bad, we exploit the flexibility of mesh generator utilized, which allows for the global or local remeshing of the domain through the different subdomains. The procedures presented are utilized in the solution of model problems involving the movement of circular cylinder immersed in a liquid flow with the objective of demonstrating the diverse features of the strategies and procedures developed.
<b>Keywords.</b> Fluid-Structure Interaction, ALE, dynamic mesh, global and local remeshing.