The impact of secondary mean vortices on turbulent separation in 3D Diffusers

Dominic Von Terzi, Hayder Schneider, Hans Jörg Bauer

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

4 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationHigh Performance Computing in Science and Engineering 2010 - Transactions of the High Performance Computing Center, Stuttgart, HLRS 2010
PublisherSpringer
Pages339-352
Number of pages14
ISBN (Print)9783642157479
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event13th Annual Results and Review Workshop on High Performance Computing in Science and Engineering, HLRS 2010 - Stuttgart, Germany
Duration: 4 Oct 20105 Oct 2010

Publication series

NameHigh Performance Computing in Science and Engineering 2010 - Transactions of the High Performance Computing Center, Stuttgart, HLRS 2010

Conference

Conference13th Annual Results and Review Workshop on High Performance Computing in Science and Engineering, HLRS 2010
Country/TerritoryGermany
CityStuttgart
Period4/10/105/10/10

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