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Non-Oberbeck-Boussinesq effects in rotating Rayleigh-Bénard convection

Horn, Susanne and Shishkina, Olga and Wagner, Claus (2011) Non-Oberbeck-Boussinesq effects in rotating Rayleigh-Bénard convection. Bulletin of the American Physical Society. 64th Annual Meeting of the APS Division of Fluid Dynamics - DFD11, 20. – 22. Nov. 2011, Baltimore, Maryland, USA.

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Official URL: http://meeting.aps.org/Meeting/DFD11/Event/154176

Abstract

We present results from Direct Numerical Simulations of rotating Rayleigh-B\'enard convection in a cylindrical cell with unity aspect ratio for water with a Prandtl number of $Pr = 4.38$ and glycerol with $Pr = 2547.9$ with a special focus on temperature dependent material properties and thus not within the framework of the conventionally used Oberbeck-Boussinesq (OB) approximation. The generated turbulent flow fields are analysed with respect to the deviations from the OB cases. For the non-Oberbeck-Boussinesq cases we obtain a breakdown of the top-bottom symmetry, that is different boundary layer thicknesses, asymmetric velocity flow patterns and modified mean temperature profiles including an increase of the centre temperature and in the case of rotation a diminished temperature gradient within the bulk. Furthermore we find a slightly different scaling of the Nusselt number with the Rayleigh as well as with the Rossby number.

Document Type:Conference or Workshop Item (Speech)
Title:Non-Oberbeck-Boussinesq effects in rotating Rayleigh-Bénard convection
Authors:
AuthorsInstitution or Email of Authors
Horn, SusanneSusanne.Horn@dlr.de
Shishkina, OlgaOlga.Shishkina@dlr.de
Wagner, ClausClaus.Wagner@dlr.de
Date:2011
Refereed publication:No
In ISI Web of Science:No
Volume:Vol. 5
Publisher:Bulletin of the American Physical Society
Series Name:Book of Abstracts
Status:Published
Keywords:Rayleigh-Bénard convection
Event Title:64th Annual Meeting of the APS Division of Fluid Dynamics - DFD11
Event Location:Baltimore, Maryland, USA
Event Type:international Conference
Event Dates:20. – 22. Nov. 2011
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 - Simulation & Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Susanne Horn
Deposited On:07 Feb 2012 08:52
Last Modified:12 Dec 2013 21:22

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