Vortex

fluid flow revolving around an axis of rotation

A vortex (pl. vortices) is a spinning, often turbulent, flow of fluid. The motion of the fluid swirling rapidly around a center is called a vortex. The speed and rate of rotation of the fluid are greatest at the center and become smaller with distance from the center.

Vortex created by the passage of an aircraft wing, revealed by coloured smoke

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