This is a photo of a beautiful Von Karman vortex street being shed in the wake of an island in the Indian Ocean. I think this is a wonderful example of what fluids research is all about. In a lab we are able to see this on a whim, but it is humbling to see a phenomenon like this on such a large scale. Especially in this class, where we photograph smaller flows often, it’s really interesting to realize that fluid flows can appear in nature in a way you wouldn’t expect.
Etling, Dieter. (2019). An unusual atmospheric vortex street. Environmental Fluid Mechanics. 19. 10.1007/s10652-018-09654-w.