1. Department of Mathematics, Shanghai University, Shanghai 200444, P. R. China
2. Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Tongji University, Shanghai 201804, P. R. China
3. ENN-Tongji Clean Energy Institute of Advanced Studies, Shanghai 200072, P. R. China
4. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Yanchang Road, Shanghai 200072, P. R. China