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What (who) is vortex sheath - definition
Lamb-oseen vortex; Lamb-Oseen vortex; Oseen vortex; Lamb vortex
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.
Sheath dress
 (14596508838).jpg?width=200 "Portrait of an Egyptian dancer")
![Campbell Brown]] of [[CNN]] in a sheath dress](https://commons.wikimedia.org/wiki/Special:FilePath/CNN's Campbell Brown.jpg?width=200 "Campbell Brown]] of [[CNN]] in a sheath dress")
TYPE OF DRESS DESIGNED TO FIT CLOSE TO THE BODY, RELATIVELY UNADORNED
Sheath gown; Sheath Dress; Wiggle dress
In fashion, a sheath dress is a fitted, straight cut dress, often nipped at the waistline with no waist seam. When constructing the dress, the bodice and skirt are joined together by combining the skirt darts into one dart: this aligns the skirt darts with the bodice waist dart.
Vortex ring
TORUS-SHAPED VORTEX IN A FLUID OR GAS
Spherical vortex; Hill's vortex; Vortex ringstate; Toroidal vortex; Hill's Spherical Vortex
·add. ·- A ring-shaped mass of moving fluid which, by virtue of its motion of rotation around an axis disposed in circular form, attains a more or less distinct separation from the surrounding medium and has many of the properties of a solid.
Wikipedia
Lamb–Oseen vortex
In fluid dynamics, the Lamb–Oseen vortex models a line vortex that decays due to viscosity. This vortex is named after Horace Lamb and Carl Wilhelm Oseen.
