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Automatic eduction and statistical analysis of coherent structures in the wall region of a confine plane

Pavageau, Michel and Loubiere, Karine and Gupta, Sanjeev Automatic eduction and statistical analysis of coherent structures in the wall region of a confine plane. (2006) Experiments in Fluids, vol. 4 (n° 1). pp. 35-55. ISSN 0723-4864

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Official URL: http://dx.doi.org/10.1007/s00348-006-0144-7

Abstract

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 (PIV) 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 3 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 U0 and the jet width e, is 14000. 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, organize and evolve are given. Relevant results provide an original picture of the plane turbulent impinging jet.

Item Type:Article
Additional Information:This publication is available at http://www.springer.com/engineering/journal/348
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université de Nantes (FRANCE)
Other partners > Ecole des Mines de Nantes (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Ecole Nationale d'Ingénieurs des Techniques des Industries Agricoles et Alimentaires - ENITIAA (FRANCE)
Laboratory name:
Statistics:download
Deposited By:Karine LOUBIERE

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