1. Department of Engineering and Applied Sciences; Università degli Studi di Bergamo; Viale Marconi 5 24044 Dalmine (BG) Italy
2. DESTEC; Università di Pisa; Largo Lazzarino 2 56122 Pisa Italy
3. MOX, Modeling and Scientific Computing, Department of Mathematics; Politecnico di Milano; Piazza Leonardo da Vinci 32 20133 Milano Italy
4. Energy Department; Politecnico di Milano; Via Lambruschini 4A 20158 Milano Italy
5. School of Computing, Engineering and Mathematics; University of Brighton; Lewes Road, BN2 4GJ Brighton UK