The interaction between a crossflow and a transverse jet of fluid constitutes a flow configuration with great importance to various fields of science. As just one of many examples, it helps to predict the consequences of volcanic eruptions where large amounts of ash may be transported by wind.
The mixing between the jet and the crossflow, e.g. between volcanic ash and wind, is brought about by different intriguing vortical structures. Here, we visualize these (often invisible) vortices by using a water-fluorescein dilution for the jet. We are also interested in understanding the influence of the ratio between jet and crossflow velocity on the shape of vortex structures, and the images shown on the poster indicate that this parameter has a very distinct impact.