LES Simulations were performed of natural convection flow in a closed cavity. The simulations reliably predicted mean temperature and velocity profiles and the wall heat fluxes. The LES also well predicted the rms velocity fluctuations but over predicted the rms temperature fluctuations. It was found that the sub-grid scale model used had little effect on the rms temperature fluctuation. It is likely that a sub-grid heat flux model which includes buoyancy effects would be required to match the rms temperatures. Finally this investigation has shown that LES can be used for engineering analysis of wall heat flux.
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