1. Rambøll Denmark, Copenhagen 2300, Denmark
2. Acoustic Technology, Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark
3. Scientific Computing Section, Department of Applied Mathematics and Computer Science, Technical University of Denmark, Kongens Lyngby 2800, Denmark
4. Treble Technologies, Reykjavík 102, Iceland
5. Chair of Computational Mathematics and Simulation Science, Ecole Polytechnique Federale de Lausanne, Lausanne 1015, Switzerland