Riverside Rapids —Declan Clifford, Ewan Armstrong-Miller & Neeraj Sumaria (University of Southampton)

Turbulent flow in a river with chaotic waves. The picture was taken at low-tide when the riverbed roughness has more pronounced effects on turbulence production. An instantaneous shot is compared to a long-exposure shot, analogous to the RANS equations where the flow characteristics are averaged over time.

https://fluids.ac.uk/files/08_[Clifford]bitmap_crop_fullsize.1662496100.jpg