A discontinuous finite element method for solving a multiwell problem

Many physical materials of practical relevance can attain several variants of crystalline microstructure. The appropriate energy functional is necessa rily nonconvex, and the minimization of the functional becomes a challengin g problem. A new numerical method based on discontinuous finite elements an d a scaled energy functional is proposed. It exhibits excellent convergence behavior for the energy (second order) as well as other crucial quantities of interest for general spatial meshes, contrary to standard (non-)conform ing methods. Both theoretical analyses and numerical test calculations are presented and contrasted to other current finite element methods for this p roblem.