Large displacement body-fitted FSI simulations using a mesh-connectivity-change moving mesh strategy

Nicolas Barral (1) , Frédéric Alauzet (1)

1 Gamma3 - Automatic mesh generation and advanced methods

This paper deals with numerical simulations involving three-dimensional moving geometries with large displacements. Such simulations are much valued by industries, but remain very time-consuming. A robust moving mesh algorithm coupling an elasticity-like mesh deformation solution and mesh optimizations is proposed, that allows to avoid remeshing while performing large displacements. However, this is done at the cost of relaxing the fixed-topology constraint imposed by the classical Arbitrary-Lagrangian-Eulerian (ALE) framework. An ALE compressible flow solver is integrated to this process. This solver lies on the strict interpretation of the Discrete Geometrical Conservation Law to preserve the order of accuracy of the time integration. For fluid-structure interaction (FSI) simulations, the six degrees of freedom (6-DOF) approach for rigid bodies is considered. Finally, 3D imposed-motion and FSI examples are given, to validate the proposed approach

Mots clés: ALE moving mesh

Domaines: Analyse numérique [math.NA]; Equations aux dérivées partielles [math.AP]

Nicolas Barral, Frédéric Alauzet. Large displacement body-fitted FSI simulations using a mesh-connectivity-change moving mesh strategy. 44th AIAA Fluid Dynamics Conference, Jun 2014, Atlanta, United States. ⟨10.2514/6.2014-2773⟩. ⟨hal-01113351⟩