1. Department of Mechanical Engineering, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece
2. Department of Mechanical Engineering, IIT Madras, Chennai 600036, India
3. Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK
4. Keihin Corporation, Tochigi R&D Center, Tochigi 329-1233, Japan