1. Temasek Laboratories, National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Singapore
2. Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
3. Department of Aerodynamics, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China