Content deleted Content added
m Reverted edits by Schizophrenia12323 (talk) (HG) (3.4.10) |
GreenC bot (talk | contribs) Rescued 1 archive link. Wayback Medic 2.5 |
||
Line 4:
[[File:Whirpool Clouds.jpg|thumb|right|250px|A [[Kármán vortex street]] is demonstrated 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]]
In [[fluid dynamics]], a '''vortex''' (plural '''vortices'''/'''vortexes''')<ref>{{Cite web|url = https://www.oxforddictionaries.com/us/definition/american_english/vortex|archive-url = https://web.archive.org/web/20130203014339/http://oxforddictionaries.com/us/definition/american_english/vortex|url-status = dead|archive-date = February 3, 2013|title = vortex|access-date = 2015-08-29|website = Oxford Dictionaries Online (ODO)|publisher = Oxford University Press}}</ref><ref>{{Cite web|url = http://www.merriam-webster.com/dictionary/vortex|title = vortex|access-date = 2015-08-29|website = Merriam-Webster Online|publisher = Merriam-Webster, Inc.}}</ref> is a region in a fluid in which the flow revolves around an axis line, which may be straight or curved.<ref>{{cite book |last=Ting |first=L.|title=Viscous Vortical Flows|series=Lecture notes in physics|publisher=Springer-Verlag |year=1991|isbn=978-3-540-53713-7}}</ref><ref>{{cite conference|last=Kida|first=Shigeo|url=http://www.igf.fuw.edu.pl/IUTAM/ABSTRACTS/Kida.pdf |title=Life, Structure, and Dynamical Role of Vortical Motion in Turbulence|conference=IUTAMim Symposium on Tubes, Sheets and Singularities in Fluid Dynamics|year=2001|location=Zakopane, Poland}}</ref> Vortices form in stirred fluids, and may be observed in [[smoke ring]]s, [[whirlpool]]s in the [[Wake (physics)|wake]] of a boat, and the winds surrounding a [[tropical cyclone]], [[tornado]] or [[dust devil]].
Vortices are a major component of [[turbulence|turbulent flow]]. The distribution of velocity, [[vorticity]] (the [[curl (mathematics)|curl]] of the flow velocity), as well as the concept of [[Circulation (fluid dynamics)|circulation]] are used to characterise vortices. In most vortices, the fluid flow velocity is greatest next to its axis and decreases in inverse proportion to the distance from the axis.
| |||