Sequence of equally spaced jets at high Re —Christian Toma, Pedro Colombas Vives & Simone Chellini (University of Southampton)

The Italian Frecce Tricolori aviation display team emitting a sequence of equally spaced jets of smoke. As the jet flow loses energy and begins to mix with the free stream flow, the scales of turbulent mixing can be seen.

https://fluids.ac.uk/files/10_[Toma]Group4_lowres.1662484099.jpg