Adaptive mesh refinement with combined criteria for fast transient fluid-structure dynamics

The present contribution deals with adaptive mesh refinement for fluid-structure systems undergoing fast transient phenomena. The mesh for fluid and structures is fully unstructured and the representation is Lagrangian for structures and Eulerian or ALE for fluids. It follows some previous work from Diez, Verdugo and Casadei in the framework of EUROPLEXUS software (EPX, http://www-epx.cea.fr, coownership of CEA and EC/JRC, free for academics). The focus is set here on refinement criteria and especially on the simultaneous use of multiple criteria of different natures, such as gradient-based indicators for accurate wave propagation, proximity to a fluid-structure interface or to a purely fluid interface in the case of multi-component equations of state (water/air interfaces for instance). Figure 1 provides a simple example of mesh refinement in a fluid-structure situation. Dealing with mesh refinement close to contact surfaces in structure only configurations shall also be considered. A special care is given to the robustness of the proposed approach and on its algorithmic formulation for an efficient parallel solution, taking benefit from high performance calculators being a central issue for any method designed for industrial applications.JRC.G.4-European laboratory for structural assessmen