This image comes from a SpaceX “Startship Update” video from Sep. 28, 2019, which was not credited to a specific creator. I personally love the colors and shape of the flow. It is interesting to look at the mach diamonds and see how they transition from laminar to turbulent. I also love the lighting effect the rocket burn creates on the dust getting kicked up from the ground.
Engine test happens at 28:40
Third prize. I really like how the dust looks like it is in daylight, but is only illuminated by the jet engine