Spatial development of turbulent flow within a heated duct
Résumé
Large eddy simulations (LES) of a turbulent field within a heated duct are presented. As opposed to a previously performed LES which assumed periodicity in the flow direction, here we consider spatially growing situations for which a thermal boundary layer grows in the longitudinal direction. Characteristic wave boundary conditions previously proposed for subsonic flows are implemented and shown to yield good results. Two different thermal boundary conditions are considered in the spatial configuration: the first case corresponds to an imposed temperature at the wall and the second to an imposed heat flux. As we move downstream in the duct, we observed the progressive formation of a unique ejection of hot fluid localized in the middle plane of the heated wall. This induces significant variations in thermal characteristics along the transverse direction of the heated wall.
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