1. School of Mechanical Engineering, Qingdao Technological University, Qingdao 266033, P.R.C. e-mail:
2. University of Twente, Faculty of Engineering Technology, Department of Engineering Fluid Dynamics, Enschede 7500AE, The Netherlands e-mail:
3. Université de Lyon, INSA de Lyon, UMR CNRS 5259, Villeurbanne F69621, France e-mail: