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Influence of the lateral walls on the thermal plumes in turbulent Rayleigh-Bénard convection in rectangular containers

Kaczorowski, Matthias and Wagner, Claus (2009) Influence of the lateral walls on the thermal plumes in turbulent Rayleigh-Bénard convection in rectangular containers. ERCOFTAC Workshop Direct and Large-Eddy Simulations 7, 2008-09-08 - 2008-09-10, Triest, Italien.

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Official URL: http://www.springer.com/engineering/book/978-90-481-3651-3

Abstract

DNS of Rayleigh-Bénard convection have been performed in a cube for Ra up to 2.31 x 10<sup>8</sup> and compared to simulations conducted in a rectangular periodic cell. Comparison of the mean heat transfer shows only small differences after the onset of turbulence, which appear to vanish for Ra→∞. Evaluation of the contributions of the regions associated with the bulk (I), plumes and mixing layers (II) and the conductive sublayer (III) reveal that the respective contributions ar similar for Ra≥3.5x10<sup>6</sup>, whereas at the lowest Ra region II dissipation rates contribute significantly more to the mean heat transfer in the cube. Significant differences are also observed in the temporal behaviour of the least-squares fit coefficient B<sub>2</sub> of the conductive sublayer for Ra up to 3.5x10<sup>6</sup>. This is also reflected by a mean temperature profile that in the cube resembles a laminar profile, whereas a turbulent one is found in the periodic cell.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Influence of the lateral walls on the thermal plumes in turbulent Rayleigh-Bénard convection in rectangular containers
Authors:
AuthorsInstitution or Email of Authors
Kaczorowski, MatthiasUNSPECIFIED
Wagner, ClausUNSPECIFIED
Date:2009
Refereed publication:No
In ISI Web of Science:No
Series Name:Conference Proceedings erscheinen in ERCOFTAC Series
Status:Published
Keywords:thermal dissipation rates, cube, shedding frequency, heat transfer
Event Title:ERCOFTAC Workshop Direct and Large-Eddy Simulations 7
Event Location:Triest, Italien
Event Type:Workshop
Event Dates:2008-09-08 - 2008-09-10
Organizer:University of Trieste
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Matthias Kaczorowski
Deposited On:30 Nov 2009 15:39
Last Modified:12 Dec 2013 20:29

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