1. Computational Science and Engineering Laboratory, ETH Zürich, Zürich CH-8092, Switzerland
2. Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
3. Department of Mechanical Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
4. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States