Universitetet i Oslo Acknowledgments

First and foremost I would like to thank my supervisors, Marie Rognes and Kent-Andre ́ Mardal. Your advice and encouragement have helped me a great deal in the process of writing this thesis. I am truly grateful for your guidance and support during this time. I would like to express my gratitude to friends and acquaintances both at the University of Oslo and at Simula, for many interesting, encouraging and fruitful conversations. A special thanks goes out to Karen-Helene Støverud, who provided me with code for the pressure data, and meshes, and was always available to answer any questions I had. Thank you! My friends and family have been loving and supportive of me throughout this process. You have reminded me that there is a world outside the study hall, and you have kept my spirits up. For that I am very grateful. Last, but not least, my wonderful Fredrik: Thank you for everything, you are the best. The simulations in this thesis were performed on the Abel Cluster, owned by the University of Oslo and the Norwegian metacenter for High Performance Computin