Since January 2012, Ragnar has been immersed in the compressible and supersonic world of internal flows in rocket engine nozzles. His work is focused on the infamous side-load problem. Here is a sneak preview from his upcoming paper that describes, in short, this side-load problem; "Modern space vehicles take off using a combination of solid rocket boosters and rocket engines. During the startup of a rocket engine at sea level the flow separates from the nozzle wall because of the over expansion of the nozzle. This creates an attached shock inside the nozzle and due to the sudden pressure rise across the attached shock, any asymmetry of the shock location along the circumference of the nozzle can cause side loads, potentially harmful to the nozzle structure and the engine"This phenomenon described above has been extensively researched over the past decades. The current research project that Ragnar is involved in aims to add to the existing and limited understanding of the phenomenon by means of advanced numerical simulation methods. The Swedish National Space Board is greatly acknowledged for funding the project, as is GKN Aerospace Engine Systems in Trollhättan for technical guidance. Supervising the project are Niklas Andersson and Lars-Erik Eriksson at Chalmers and Jan Östlund at GKN.Ragnar's Academic BackgroundRagnar holds a B.Sc. Degree in mechanical engineering from the University of Iceland. He earned his M.Sc. Degree in solid and fluid mechanics from Chalmers in 2011. During his masters thesis work and after graduation he had a brief encounter with external flow simulations around bluff bodies such as a rudimentary airplane landing gear and pyramids. In that work he used the Large Eddy Simulation method and the new and exciting Partially Averaged Navier-Stokes method.