ALE incompressible fluid-shell coupling based on a higher-order auxiliary mesh and positional shell finite element.

Autor: Fernandes, Jeferson Wilian Dossa, Coda, Humberto Breves, Sanches, Rodolfo André Kuche
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Zdroj: Computational Mechanics; Mar2019, Vol. 63 Issue 3, p555-569, 15p
Abstrakt: One of the most employed strategies in finite element analysis of fluid-structure interaction (FSI) problems involves using an arbitrary Lagrangian-Eulerian (ALE) method for the fluid, requiring an additional step to the partitioned coupling algorithm: the dynamic mesh moving. Mesh moving techniques need to avoid excessive element distortion or inversion. In this work, we develop a partitioned FSI algorithm for large displacement shell structures-incompressible flow interaction analysis using the finite element method (FEM). The coupling is performed by a block Gauss-Seidel implicit approach and the fluid mesh is updated by a linear Laplacian smoothing. To save computing time and avoid element inversion during the mesh deformation procedure, we introduce a coarse higher-order auxiliary mesh, which is used only to capture the structural deformation and extend it to the fluid domain. The shell structure is modeled by a FEM formulation with nodal positions and components of an unconstrained vector as degrees of freedom, which avoids the need for dealing with large rotations approximations. We solve the fluid dynamics equations in the ALE description using an implicit time marching temporal integrator and stabilized mixed FEM spatial discretization. Finally, the accuracy and robustness of the proposed method are tested with numerical examples compared to the literature results. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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