1. Lecturer, School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
2. Lecturer, School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK
3. Professor, School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK
4. Associate Professor, Department of Mechanical Engineering, School of Engineering, Khalifa University of Science and Technology, Abu Dhabi PO Box 127788, UAE; Senior Lecturer, School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK Emails: , (author for correspondence)