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, 2011-11-20 - 2011-11-22, 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.
Item URL in elib: | https://elib.dlr.de/70952/ | ||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||
Title: | Non-Oberbeck-Boussinesq effects in rotating Rayleigh-Bénard convection | ||||||||||||||||
Authors: |
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Date: | 2011 | ||||||||||||||||
Refereed publication: | No | ||||||||||||||||
Open Access: | No | ||||||||||||||||
Gold Open Access: | No | ||||||||||||||||
In SCOPUS: | 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 Start Date: | 20 November 2011 | ||||||||||||||||
Event End Date: | 22 November 2011 | ||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||
HGF - Program: | Aeronautics | ||||||||||||||||
HGF - Program Themes: | Aircraft Research (old) | ||||||||||||||||
DLR - Research area: | Aeronautics | ||||||||||||||||
DLR - Program: | L AR - Aircraft Research | ||||||||||||||||
DLR - Research theme (Project): | L - Simulation & Validation (old) | ||||||||||||||||
Location: | Göttingen | ||||||||||||||||
Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Fluid Systems | ||||||||||||||||
Deposited By: | Horn, Susanne | ||||||||||||||||
Deposited On: | 07 Feb 2012 08:52 | ||||||||||||||||
Last Modified: | 24 Apr 2024 19:36 |
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