1. Institute of Fluid Science, Tohoku University 1 , 2-1-1 Katahira, Aoba, Sendai, Miyagi 980-8577, Japan
2. Institute of Fluid Dynamics, Department of Mechanical and Process Engineering, ETH Zurich 2 , Sonneggstrasse 3, 8092 Zurich, Switzerland
3. Institute of Mechanical Engineering, Ecole Polytechnique Fédérale de Lausanne 3 , Avenue de Cour 33bis, 1007 Lausanne, Switzerland