Vortex
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In fluid dynamics, a vortex is a region in a fluid in which the flow revolves around an axis line, which may be straight or curved. Vortices form in stirred fluids and may be observed in smoke rings,
Vortex created by the passage of an aircraft wing, revealed by colored smoke
A Kármán vortex street is shown in this photo, as winds from the west blow onto clouds that have formed over the mountains in the desert. This phenomenon observed from ground level is extremely rare, as most cloud-related Kármán vortex street activity is viewed from space.
The Crow instability of a jet aeroplane's contrail visually demonstrates the vortex created in the atmosphere (gas fluid medium) by the passage of the aircraft.
Saturn's north polar vortex
Kármán vortex street
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In fluid dynamics, a Kármán vortex street is a repeating pattern of swirling vortices, caused by a process known as vortex shedding, which is responsible for the unsteady separation of flow of a fluid
Vortex
…Hurricane – Tropical cyclone that forms in the Atlantic Ocean Kármán vortex street – Repeating pattern of swirling vortices Kelvin–Helmholtz instability – Phenomenon of fluid mechanics…
Visualisation of the vortex street behind a circular cylinder in air (on the left); the flow is made visible through release of glycerol vapour in the air near the cylinder
Chimneys with strakes fitted to break up vortices
Vortex street 1