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LARGE-EDDY SIMULATION OF THE TURBULENT FLOW IN DUCTS A STUDY OF HEATING AND CURVATURE EFFECTS

Jerome Hebrard
L.E.G.I./Institut de Mécanique de Grenoble B.P. 53, 38041 Grenoble Cedex 09, France

Olivier Metais
Grenoble-INP/CNRS/UJF-Grenoble 1, LEGI UMR 5519, Grenoble, F-38041, France

Martin Salinas-Vasquez
Instituto de Ingenieria, UNAM, MEXICO

Resumo

We first study the spatial development of turbulent flow inside a straight duct of square section: heating with a constant temperature is applied suddenly at a given downstream location of the duct. The downstream development of the thermal boundary layer is then studied and compared with the case of a fully developed flow within a heated duct. We investigate the influence of the heating on the flow structures such as low-speed streaks, ejections etc .. The use of curvilinear coordinates allows us to consider duct with more geometries and curvature effects are then studied. The case of a S-shape duct is considered exhibiting both convex and concave curvatures. We assist to the formation of Görtler type vortices and the influence of the heating is investigated.