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A '''vortex''' (pl. ''vortices'') is a [[Rotation|spinning]], often [[Turbulence|turbulent]],
A '''vortex''' (pl. ''vortices'') is a [[Rotation|spinning]], often [[Turbulence|turbulent]],
flow of [[fluid]]. Any [[spiral]] motion with closed [[Streamlines, streaklines and pathlines|streamlines]] is vortex flow. 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 decrease progressively with distance from the center.
flow of [[fluid]]. Any [[spiral]] motion with closed [[Streamlines, streaklines and pathlines|streamlines]] is vortex flow. 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 decrease progressively with distance from the center.
<center>For lessons on the related [[topic]] of '''''[[Portals]]''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Portal '''''this link'''''].</center>
== Properties ==
== Properties ==
Vortices display some special properties:
Vortices display some special properties: