1. University of Kaiserslautern, Germany
2. Konrad-Zuse-Zentrum f ¨ur Informationstechnik Berlin (ZIB), FU Berlin, Germany
3. Fraunhofer Institut f ¨ur Techno- und Wirtschaftsmathematik (ITWM) in Kaiserslautern, Germany
4. University of Kaiserslautern, Germany, and the Institute for Data Analysis and Visualization at the University of California, Davis, CA
5. Department of Mechanical and Aeronautical Engineering, University of California, Davis, CA
6. Institute for Data Analysis and Visualization and Department of Computer Science, University of California, Davis, CA