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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Large Eddy Simulation of Turbulent Natural Convection Flows in Cavities

Get access (open in a dialog) DOI: 10.1615/IHTC12.1830
6 pages

要約

We present in this paper a LES approach for natural convection flows based on an original local diffusivity model independent of the subgrid viscosity. In a first step, as a test configuration, we present results obtained for a 2D differentially heated cavity at a Rayleigh number of 5.1010. Comparison with DNS results shows the improvement of the thermal diffusivity model over a local Reynolds analogy using a constant subgrid Prandtl number. In a second step, laminar regime is investigated for a 3D cavity and Rayleigh numbers up to 107, Finally, LES approach is applied to a turbulent configuration in order to evaluate the influence of the 3D aspects of the flow on the thermal transfer in the cavity.