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INVESTIGATION OF THE BOUNDARY LAYERS IN TURBULENT RAYLEIGH-BENARD CONVECTION

Matthias Kaczorowski
Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR) Bunsenstr. 10, D-37073 Gottingen, Germany

Anna Ebert
Dept. of Mechanical Engineering Technical University of Ilmenau P.O. 100565, D-98684 Ilmenau, Germany

Claus Wagner
German Aerospace Center (DLR), Institute for Aerodynamics and Flow Technology, Bunsenstrasse 10, 37073 Göttingen, Germany; Ilmenau University of Technology, Institute of Thermodynamics and Fluid Mechanics, Germany

Andre Thess
Department of Mechanical Engineering, Ilmenau University of Technology, P.0. Box 100565, 98684 Ilmenau, Germany

Abstrakt

In the present study the temperature profiles of turbulent Rayleigh-Bénard convection obtained through DNS and microthermistor measurements in a rectangular container are compared. It is found that both DNS and experimental data are in good agreement when comparing temperature profiles at topologically similar flow positions. It is observed that the data sets obtained at Ra ~ 108 are in significantly better agreement than at Ra ~ 107. Finally, our results are compared to the analytical fit function proposed by Shishkina & Thess (2009) and find that this function gives a very good representation of the DNS data when the temperature profiles through the centre of the roll structures are evaluated.