The Impact of Secondary Mean Vortices on Turbulent Separation in 3D Diffusers

Dominic von Terzi (), Hayder Schneider () and Hans-Jörg Bauer ()
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Dominic von Terzi: Karlsruher Institut für Technologie (KIT), Institut für Thermische Strömungsmaschinen
Hayder Schneider: Karlsruher Institut für Technologie (KIT), Institut für Thermische Strömungsmaschinen
Hans-Jörg Bauer: Karlsruher Institut für Technologie (KIT), Institut für Thermische Strömungsmaschinen

A chapter in High Performance Computing in Science and Engineering '10, 2011, pp 339-352 from Springer

Abstract: Abstract In rectangular ducts with fully-developed turbulent flow, mean vortices in the corners form secondary flow patterns whose energy contents is orders of magnitude lower than that of the flow in the streamwise direction. In the present numerical experiments, it is demonstrated using Large Eddy Simulations (LES) that these Mean Secondary Vortices (MSV) exert a profound influence on flow separation in three-dimensional asymmetric diffusers following such a duct. By removing, enhancing or switching the sense of rotation of the MSV in the inlet duct of two diffusers the shape, location and extent of separation zones farther downstream were drastically altered and, hence, the performance of the device. These results provide an explanation why eddy-viscosity based Reynolds-Averaged Navier–Stokes (RANS) models, that inherently cannot account for MSV, fail in predicting even the location of the separated flow in such diffusers.

Keywords: Large Eddy Simulation; Streamwise Velocity; Separation Bubble; Separation Zone; Secondary Vortex (search for similar items in EconPapers)
Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-642-15748-6_26

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DOI: 10.1007/978-3-642-15748-6_26

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