Flow visualization for a circular cylinder section in laminar flow conditions within a wind tunnel. Non-composite photograph, standard touch-up with (contrast, highlights, shadows etc.)
Kármán vortex street in the wake of an oscillating circular cylinder in laminar flow conditions —

Flow visualization for a circular cylinder section in laminar flow conditions within a wind tunnel. Non-composite photograph, standard touch-up with (contrast, highlights, shadows etc.)

https://fluids.ac.uk/files/14_Elvin_HII_FlowViz_sml_1024w.1543871422.jpg