Flow, Turbulence and Combustion

, Volume 89, Issue 3, pp 385–406 | Cite as

External Intermittency Simulation in Turbulent Round Jets

  • T. Gilliland
  • K. K. J. Ranga-Dinesh
  • M. Fairweather
  • S. A. E. G. Falle
  • K. W. Jenkins
  • A. M. Savill
Article

Abstract

Direct numerical and large eddy simulation (DNS and LES) are applied to study passive scalar mixing and intermittency in turbulent round jets. Both simulation techniques are applied to the case of a low Reynolds number jet with Re = 2,400, whilst LES is also used to predict a high Re = 68,000 flow. Comparison between time-averaged results for the scalar field of the low Re case demonstrate reasonable agreement between the DNS and LES, and with experimental data and the predictions of other authors. Scalar probability density functions (pdfs) for this jet derived from the simulations are also in reasonable accord, although the DNS results demonstrate the more rapid influence of scalar intermittency with radial distance in the jet. This is reflected in derived intermittency profiles, with LES generally giving profiles that are too broad compared to equivalent DNS results, with too low a rate of decay with radial distance. In contrast, good agreement is in general found between LES predictions and experimental data for the mixing field, scalar pdfs and external intermittency in the high Reynolds number jet. Overall, the work described indicates that improved sub-grid scale modelling for use with LES may be beneficial in improving the accuracy of external intermittency predictions by this technique over the wide range of Reynolds numbers of practical interest.

Keywords

DNS LES Scalar field Intermittency Round jet 

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • T. Gilliland
    • 1
  • K. K. J. Ranga-Dinesh
    • 3
  • M. Fairweather
    • 1
  • S. A. E. G. Falle
    • 2
  • K. W. Jenkins
    • 3
  • A. M. Savill
    • 3
  1. 1.School of Process, Environmental and Materials EngineeringUniversity of LeedsLeedsUK
  2. 2.School of MathematicsUniversity of LeedsLeedsUK
  3. 3.School of EngineeringCranfield UniversityBedfordUK

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