1. Zienkiewicz Centre for Computational Engineering, College of Engineering; Swansea University; Swansea SA2 8PP UK
2. Department of Engineering Mechanics, School of Aerospace Engineering; Tsinghua University; Beijing 10084 China
3. Key Laboratory of Applied Mechanics, School of Aerospace Engineering; Tsinghua University; Beijing 10084 China
4. Energy Safety Research Institute, College of Engineering; Swansea University; Swansea SA2 8PP UK