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Small Scale von Karman Vortices

The photo above shows von Karman vortices observed in a muddy puddle near Eger, Hungary. A pebble caused the saber-shaped perturbations in this approximately 12 by 16 in (30 by 40 cm) puddle — the result of melting snow flowing through a tire track.

The direction of flow here is from right to left. In a fluid, be it air or liquid, an object large enough to interfere with the movement of the fluid often leads to the formation of von Karman vortices on the leeside of the flow.

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