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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN 打印: 1-56700-135-1

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

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.
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