New spatio-temporal instability scenarios in non-Boussinesq mixed convection

Presentation

Suslov, Sergey A.. 2007. "New spatio-temporal instability scenarios in non-Boussinesq mixed convection." Sathyasheelappa, Vinaya K. (ed.) 60th Annual Meeting of the Divison of Fluid Dynamics, American Physical Society. Salt Lake City, United States 18 - 20 Nov 2007 College Park, MD.
Paper/Presentation Title

New spatio-temporal instability scenarios in non-Boussinesq mixed convection

Presentation TypePresentation
Authors
AuthorSuslov, Sergey A.
EditorsSathyasheelappa, Vinaya K.
Journal or Proceedings TitleBulletin of the American Physical Society
Journal Citation50 (12), p. 204
Number of Pages1
Year2007
Place of PublicationCollege Park, MD
Web Address (URL) of Paperhttp://meetings.aps.org/Meeting/DFD07/Event/72739
Conference/Event60th Annual Meeting of the Divison of Fluid Dynamics, American Physical Society
Event Details
60th Annual Meeting of the Divison of Fluid Dynamics, American Physical Society
Event Date
18 to end of 20 Nov 2007
Event Location
Salt Lake City, United States
Abstract

[Abstract]: Mixed convection flows in a tall vertical channel with differentially heated walls subject to large cross-channel temperature gradients are shown to exhibit enormous variety of instability scenarios which have
two physically distinct origins: the shear and the buoyancy of the flow. In order to visualize the most typical spatio-temporal patterns and complement previous analytical stability studies the Fourier integrals representing linearised disturbances arising from an
initially localised source are evaluated numerically. The
disturbance fields are obtained for strongly non-Boussinesq
high-temperature convection of air. They are contrasted to their counterparts in the Boussinesq limits of small temperature gradients. A drastic difference in disturbance evolution scenarios is found. In particular, it is shown that non-Boussinesq natural convection is convectively unstable while mixed convection flows can be absolutely unstable. These scenarios are opposite to the ones detected in the classical Boussinesq convection in the same
geometry.

Keywordsnon-Boussinesq convection; spatio-tempoeral instability
ANZSRC Field of Research 2020401207. Fundamental and theoretical fluid dynamics
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsComputational Engineering and Science Research Centre
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