1. ETH Zurich, Department of Mechanical and Process Engineering, Institute of Fluid Dynamics 1 , Sonneggstrasse 3, Zurich 8092, Switzerland
2. INRIA Bordeaux Sud-Ouest, project-team CAGIRE, Universite de Pau et des Pays de l'Adour, E2S UPPA, Laboratory of Mathematics and Applied Mathematics (LMAP) 2 , Pau, France