Why tornado-like vortices are persistent?

Klimenko, Alexander Y. (2016). Why tornado-like vortices are persistent?. In: Australasian Fluid Mechanics Conference. 20th Australasian Fluid Mechanics Conference, Perth, Australia, (). 5-8 December 2016.

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Author Klimenko, Alexander Y.
Title of paper Why tornado-like vortices are persistent?
Conference name 20th Australasian Fluid Mechanics Conference
Conference location Perth, Australia
Conference dates 5-8 December 2016
Convener Australasian Fluid Mechanics Society
Proceedings title Australasian Fluid Mechanics Conference
Publisher Australasian Fluid Mechanics Society
Publication Year 2016
Sub-type Fully published paper
Total pages 4
Collection year 2017
Language eng
Abstract/Summary The tornado-like vortices and vortical motions in turbulent flows have notable similarities. Both types of vortical flows have outer scales, with are subject to external influence; inner scales, which are affected by viscosity; and a range of inertial scales that display a degree of universality. Both types of the flows transfer kinetic energy from large to small scales, where the action of viscosity becomes significant. However, unlike turbulent flows, tornado-like flows are quite regular and, it seems, can remain laminar under some conditions. At the large scales, these flows have a special mechanism (the compensating mechanism) that prevents unrestricted generation of tangential vorticity and is, it seems, primarily responsible for preserving regularity of the flow. Unsteady small-scale axisymmetric disturbances, which may escape control of the compensating mechanism, are analysed in the present work. These disturbances are shown to represent inertial waves, which are generalised for arbitrary axisymmetric vortical flows and found to be stable provided the axial vorticity does not change its sign.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Paper 562

Document type: Conference Paper
Collections: School of Mechanical & Mining Engineering Publications
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Created: Thu, 02 Mar 2017, 13:05:27 EST by Clare Nelson on behalf of School of Mechanical and Mining Engineering