In this talk we present a performance study of our finite element package
Hierarchical Hybrid Grids (HHG) on current European supercomputers.
HHG is designed to close the gap between the flexibility of finite
elements and the efficiency of geometric multigrid by using a compromise
between structured and unstructured grids. A coarse input FE mesh is
refined in a structured way, resulting in semi-structured meshes. First
we compare and analyze the efficiencies of the stencil-based code on
those clusters. In a second step we discuss the
-extrapolation
multigrid technique to improve the FE accuracy for an exemplary
electrochemistry application.