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Numerical investigation of local Kolmogorov scales in turbulent Rayleigh-Bénard convection

Wagner, Sebastian and Shishkina, Olga and Wagner, Claus (2012) Numerical investigation of local Kolmogorov scales in turbulent Rayleigh-Bénard convection. International Congress on Theoretical and Applied Mechanics (ICTAM 2012), 19. - 24. Aug. 2012, Peking, China.

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Official URL: http://www.ictam2012.org/

Abstract

Highly resolved direct numerical simulations (DNS) of turbulent Rayleigh-Benard convection in a cylindrical container with aspect ratio unity and Prandtl number Pr=0.786 have been performed for Rayleigh numbers Ra up to 10e9. The key ingredient for setting up a DNS is a sufficiently fine grid allowing to resolve the the local Kolmogorov scales. Usually this is done by fulfilling different published criteria for resolving the boundary layers and the bulk flow. To analyse if these criteria hold, absolute values of the smallest Kolmogorov scales obtained in DNS as well as their scaling with Ra are compared to the corresponding predictions from the theory. The analysis reveals that the smallest scales occurring in the boundary layer are about two thirds of the estimated ones. Further their scaling differs considerably from the above mentioned estimate while the bulk criterion fits quite well.

Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:Abstract Book of the 23rd International Congress of Theoretical and Applied Mechanics, Page: 311, ISBN: 978-988-16022-3-7
Title:Numerical investigation of local Kolmogorov scales in turbulent Rayleigh-Bénard convection
Authors:
AuthorsInstitution or Email of Authors
Wagner, Sebastiansebastian.wagner@dlr.de
Shishkina, Olgaolga.shishkina@dlr.de
Wagner, Clausclaus.wagner@dlr.de
Date:2012
Refereed publication:No
In ISI Web of Science:No
Series Name:Conference Proceedings on DVD-ROM 1.4G
Status:Published
Keywords:turbulent convection, direct numerical simulation, resolution requirements, boundary layers
Event Title:International Congress on Theoretical and Applied Mechanics (ICTAM 2012)
Event Location:Peking, China
Event Type:international Conference
Event Dates:19. - 24. Aug. 2012
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 - Systems & Cabin
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Sebastian Wagner
Deposited On:05 Sep 2012 14:56
Last Modified:12 Dec 2013 21:34

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