Finite element techniques for large models with motion in electromagnetism

F. Henrotte, RWTH Aachen, Germany

Wednesday, May 13
at 16.15, HG E 1.2

Finite element techniques for large models with motion will be discussed. Two main aspects will be covered, which correspond basically to the Eulerian and Lagrangian approaches. In particular situations, electromagnetic braking applications for instance, an Eulerian approach is possible. We discuss the physical definition of the problem in terms of a convective (Lie) derivative. An 3D algorithm is proposed, based on the extrusion operator of Bossavit and the work by Heumann, and the implications on the finite element data structure are pointed out. On the other hand, standard finite element models of electrical machines adopt a Lagrangian point of view. Special techniques to account for the relative motion of the rotor and the stator are then required. Re-meshing and mortar approaches will be compared in terms of their suitability for inclusion in large 3D computations.