1. Department of Civil, Environmental, and Geomatic Engineering, ETH Zürich, Stefano-Franscini-Platz 5, CH-8093 Zürich, Switzerland
2. College of Engineering, Mathematics and Physical Science, Exeter University, Exeter EX4 4QF, UK
3. Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland