1. Ph.D. Research Student Department of Mechanical Engineering, University of Bristol; Bristol BS8 1TR, UK; Visiting Scholar University of Illinois at Urbana-Champaign, 206 West Green Street, Urbana, IL 61801
2. Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801
3. Department of Mechanical Engineering, University of Bristol, Queen’s Building, University Walk, Bristol BS8 1TR, UK e-mail: