1. Politecnico di Milano ‐ Department of Mathematics, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
2. Politecnico di Milano ‐ MOX, Modelling and Scientific Computing, Department of Mathematics, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
3. Fonderie Alluminio S.p.A., Via Rubini 44, 22014 Dongo, CO, Italy