Experiments in Fluids

, Volume 41, Issue 1, pp 35–55 | Cite as

Automatic eduction and statistical analysis of coherent structures in the wall region of a confined plane turbulent impinging jet

  • M. PavageauEmail author
  • K. Loubière
  • S. Gupta
Research Article


This paper describes a vortex detection algorithm used to expose and statistically characterize the coherent flow patterns observable in the velocity vector fields measured by particle image velocimetry in the impingement region of air curtains. The philosophy and the architecture of this algorithm are presented. Its strengths and weaknesses are discussed. The results of a parametrical analysis performed to assess the variability of the response of our algorithm to the three user-specified parameters in our eduction scheme are reviewed. The technique is illustrated in the case of a plane turbulent impinging twin-jet with an opening ratio of 10. The corresponding jet Reynolds number, based on the initial mean flow velocity U 0 and the jet width e, is 14,000. The results of a statistical analysis of the size, shape, spatial distribution and energetic content of the coherent eddy structures detected in the impingement region of this test flow are provided. Although many questions remain open, new insights into the way these structures might form, organise and evolve are given. Relevant results provide an original picture of the plane turbulent impinging jet.


Vortex Particle Image Velocimetry Coherent Structure Vortex Core Particle Image Velocimetry Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The work presented in this paper was supported by the CNRS, the EMN and the French Embassy in New Delhi (India) in the form of Post-doctoral and PhD grants. It could not have been completed without the assistance of the technical staff of our laboratory. We thank, in particular, Mr Y. Gouriou, Mr F.X. Blanchet and Mr E. Chevrel for their valuable and unstinting help in the construction and instrumentation of the experimental facility designed for this work.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Ecole des Mines de Nantes, Département Systèmes Energétiques et EnvironnementGEPEA UMR 6144—CNRSNantes Cedex 3France

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