Direct and Large-Eddy Simulation III pp 13-24 | Cite as
Large Eddy Simulation of a Square Duct with a Heat Flux
Abstract
Large Eddy Simulations of a compressible turbulent square duct at low Mach number are described. First, the isothermal case with all the walls at the same temperature is considered. Good agreement with previous incompressible DNS and LES results is obtained both for the mean and turbulent statistics. The heated duct with a larger temperature prescribed at one wall is then considered. We observe an amplification of the near wall secondary flows, a decrease of the turbulent fluctuations in the near wall region and, conversely, an enhancement of the latter in the outerwall region. This can be explained by the increase of the dominant turbulence structures (ejections) and by the changes in the fluid properties associated with heating. A detailed investigation of the ejection mechanism is presented.
Keywords
Large Eddy Simulation Direct Numerical Simulation Secondary Flow Streamwise Velocity Bulk VelocityPreview
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