Adaptive Meshing for Forming Processes

Numerical Grid Generation in Computational Field Simulations, Ed. M. Cross., B. K. Soni, J. F. Thompson, J. Hauser, P. R. Eiseman, Proceedings of the 6th International Conference, held at the University of Greenwich, pp.3-19, July 1998

MESHING
RESEARCH
CORNER

Ecole Superieure des Mines de Paris, CEMEF
umr CNRS 7635
BPn 207,06 904 Sophia Antipolis, FRANCE
Thierry.Coupez@cemef.cma.fr

Abstract
Adaptive meshing are shown to play a crucial role in forming process simulation. The meshing technique used for mesh generation, mesh adaptation and remeshing in Eulerian and Lagrangian method are presented as well as some of the theoretical aspects of the a posteriori error estimation in the context of forming simulation code. The generalized mesh improvement technique mainly used in this work is shown to be well adapted to the new emerging adaptive solvers. It is shown how it can be seen as an iterative method both for mesh generation and for adaptive refinement and coarsening. Moreover, a new principle is proposed to solve strongly the coupling between the surface mesh and the volume mesh, allowing to modify the surface mesh to optimize the internal mesh. Example of 3D automatic remeshing with a local size mesh enforcement are presented for a polymer cutting and metal forging applications. A new level of optimization allowed by anisotropic mesh techniques is introduced in the context of 3D extrusion, with primarily results of error estimation and anisotropic meshes.