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A TRANS' ANALYSIS OF EFFECTS OF LORENTZ FORCE AND WALL TOPOLOGY ON THE REORGANISATION OF COHERENT STRUCTURES IN R-B CONVECTION

Sasa Kenjeres
Transport Phenomena Section, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology and J.M. Burgerscentrum for Fluid Mechanics, Delft, The Netherlands

Kemal Hanjalic
Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Faculty of Applied Sciences, Delft University of Technology (TU Delft), Building 58, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands

Abstract

The paper reports on recent progress in the application of Time-dependent Reynolds-averaged Navier-Stokes (TRANS) approach to the analysis of the effect of magnetic force and bottom wall configuration on the reorganisation of large coherent structure in Rayleigh-Benard (R-B) convection. Based on 'triple decomposition', the large scale periodic motion is fully resolved in time and space, whereas the unresolved random motion is modelled using the conventional algebraicflux expressions closed with the low-Re-number k−ε−Θ2 three-equation model. The applied method reproduced the major features of the coherent structure, as well as the long-term first and second moments in accord with the available DNS results.