The Assignment

In this project, we are interested in determining vorticity and turbulence generation in supersonic gas jets. This subject can be of relevance in the context of supersonic aircraft and rocket propulsion, where it is linked with the thrust of the engine, or in combustion engines with non-liquid fuels, when gaseous fuels are injected into the combustion chamber and good fuel-air mixtures are desired.
To this goal, the research can be strutured as follows:

• Indentification of the relevant sources of vorticity in a jet, such as shear layers, curved shock waves etc.
• Literature review on the influence of vorticity in: gas dynamic phenomena such as curved shock waves, Mach reflection, the characteristic theory of jets, and hydrodynamic instabilities such as Kelvin-Helmholtz etc.
• Setup of simplified 2D and 3D model problems with our DGSEM code FLEXI, incl. generation of suitable meshes.
• Creation of an analysis tool chain, that can then also be applied to fully 3D jet data. This will require implementation of extra functionality in our Fortran code FLEXI and post-processing of the data in Python and Paraview.
• Investigate the effect of different gas species.