Complex fluids often show viscoelastic properties, i.e. a mix of solid- and liquid-like behavior. These materials are structured on a mesoscopic scale in contrast to the atomic structure of simple liquids. While being processed or used, they undergo moderate or strong flows which can easily affect their mesostructure. In turn, structural modifications feed back on the flow itself, often triggering instabilities and turbulence. The goal of the internship is to provide a better understanding of the mechanisms responsible for the transition to elastic turbulence by characterizing the flow field and its dynamics for various viscoelastic systems ranging from the inertio-elastic domain to the purely elastic domain. Openfoam simulations may complement the experimental results.