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Flow, Turbulence and Combustion

, Volume 80, Issue 1, pp 47–59 | Cite as

Scalar Mixing and Large-Scale Coherent Structures in a Turbulent Swirling Jet

  • J. Fröhlich
  • M. García-Villalba
  • W. Rodi
Article

Abstract

The paper presents large eddy simulations of co-annular swirling jets into an open domain. In each of the annuli a passive scalar is introduced and its transport is computed. If the exit of the pilot jet is retracted strong coherent flow structures are generated which substantially impact on the transport and mixing of the scalars. Average and instantaneous fields are discussed to address this issue. A conditional averaging technique is devised and applied to velocity and scalars. This allows to quantify the impact of the coherent structures on the mixing process.

Keywords

Large eddy simulation Mixing Coherent structures Swirl flows Jets 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Institute for Technical Chemistry and Polymer ChemistryUniversity of KarlsruheKarlsruheGermany
  2. 2.Institute of Fluid MechanicsTechnical University of DresdenDresdenGermany
  3. 3.Institute for HydromechanicsUniversity of KarlsruheKarlsruheGermany

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