1. School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA
2. Department of Engineering Cybernetics, Norwegian University of Science and Technology, N-7465 Trondheim, Norway
3. Department of Mathematics, Virginia Tech, Blacksburg, Virginia 24061, USA
4. School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518058, China
5. Hermann-Föttinger-Institut für Strömungsmechanik, Technische Universität Berlin, D-10623 Berlin, Germany