1. Division of Fluid Dynamics, Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg 412 96, Sweden e-mail:
2. Division of Fluid Dynamics, Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg 412 96, Sweden
3. Advanced Simulation Technologies, AVL List GmbH, Hans-List-Platz 1, Graz 8020, Austria