1. Center for Applied Mathematics, Tianjin University, 300072 Tianjin, People’s Republic of China
2. Department of Mathematics, Imperial College London, SW7 2AZ London, United Kingdom
3. Laboratory of High-speed Aerodynamics, School of Mechanical Engineering, Tianjin University, 300072 Tianjin, People’s Republic of China
4. School of Aeronautics, Northwestern Polytechnical University, 710072 Xi’an, People’s Republic of China