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What (who) is vortex sheet - definition
Vortex sheet
A vortex sheet is a term used in fluid mechanics for a surface across which there is a discontinuity in fluid velocity, such as in slippage of one layer of fluid over another.McGraw-Hill Dictionary of Scientific and Technical Terms Retrieved July 2012 While the tangential components of the flow velocity are discontinuous across the vortex sheet, the normal component of the flow velocity is continuous.
Kármán vortex street
![Visualisation]] of the vortex street behind a circular cylinder in air; the flow is made visible through release of glycerol vapour in the air near the cylinder](https://commons.wikimedia.org/wiki/Special:FilePath/Karmansche Wirbelstr kleine Re.JPG?width=200 "Visualisation]] of the vortex street behind a circular cylinder in air; the flow is made visible through release of glycerol vapour in the air near the cylinder")
![strakes]] fitted to break up vortices](https://commons.wikimedia.org/wiki/Special:FilePath/Proserpine Mill - January 2012.jpg?width=200 "strakes]] fitted to break up vortices")
![A look at the Kármán vortex street effect from ground level, as air flows quickly from the [[Pacific ocean]] eastward over [[Mojave desert]] mountains. This phenomenon observed from ground level is extremely rare, as most cloud-related Kármán vortex street activity is viewed from space.](https://commons.wikimedia.org/wiki/Special:FilePath/Whirpool Clouds.jpg?width=200 "A look at the Kármán vortex street effect from ground level, as air flows quickly from the [[Pacific ocean]] eastward over [[Mojave desert]] mountains. This phenomenon observed from ground level is extremely rare, as most cloud-related Kármán vortex street activity is viewed from space.")
REPEATING PATTERN OF SWIRLING VORTICES CAUSED BY THE UNSTEADY SEPARATION OF FLOW OF A FLUID AROUND BLUNT BODIES
Vortex street; Vortex trail; Vortex train; Von Karman vortex street; Vortex Street; Kármán vortex trail; Kármán Vortex Trail; Kármán Trail; Von Karman street; Karmen vortice; Karmen vortices; Karman vortex; Karman vortices; Kármán vortex; Kármán vortices; Von Kármán vortices; Von Kármán vortex; Von Karman vortices; Von Karman vortex; Karman Vortex Trail; Karman vortex street; Karman vortex trail; Karman Trail; Von Kármán vortex street; Karman wind
In fluid dynamics, a Kármán vortex street (or a von 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 around blunt bodies.
Vortex ring
![The curved arrows indicate airflow circulation about the rotor disc. The helicopter shown is the [[RAH-66 Comanche]].](https://commons.wikimedia.org/wiki/Special:FilePath/Vortex ring helicopter.jpg?width=200 "The curved arrows indicate airflow circulation about the rotor disc. The helicopter shown is the [[RAH-66 Comanche]].")
TORUS-SHAPED VORTEX IN A FLUID OR GAS
Spherical vortex; Hill's vortex; Vortex ringstate; Toroidal vortex; Hill's Spherical Vortex
A vortex ring, also called a toroidal vortex, is a torus-shaped vortex in a fluid; that is, a region where the fluid mostly spins around an imaginary axis line that forms a closed loop. The dominant flow in a vortex ring is said to be toroidal, more precisely poloidal.
