1. Process Engineer, Mitsubishi Hitachi Power Systems Europe GmbH, Schiffer Str. 80, Duisburg 47059, Germany (corresponding author).
2. Authorized Manager, Mitsubishi Hitachi Power Systems Europe GmbH, Schiffer Str. 80, Duisburg 47059, Germany.
3. Lead Engineer, ANSYS Inc., 15915 Katy Freeway, Houston, TX 77094.
4. Professor, School of Mathematics, Computer Sciences and Engineering, City, Univ. of London, London EC1V 0HB, UK.