Forcing large-scale coherent streaks in a zero-pressure-gradient turbulent boundary layer

Gregory Pujals 1, 2, * Carlo Cossu 1 Sebastien Depardon 2
* Auteur correspondant
1 LadHyX - Laboratoire d'hydrodynamique
2 PSA Peugeot Citroen, Ctr Tech Velizy, F-78943 Velizy Villacoublay, France
Abstract : Large-scale coherent streaks are artificially forced in a well-developed turbulent boundary layer at [image omitted] using an array of cylindrical roughness elements. Measures of the velocity field with particle image velocimetry reveal the presence of well-reproducible, streamwise-oriented, steady coherent streaks. We show that the amplitude of these coherent streaks transiently grows in space. The position of the maximum amplitude is proportional to the spanwise wavelength of the streaks and the most amplified spanwise wavelength is of very large scale z approximate to 60. These results are in good agreement with the recent predictions based on the optimal transient growth analysis of turbulent mean flows.
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Journal of Turbulence, Taylor & Francis, 2010, 11 (25), pp.1-13. 〈10.1080/14685248.2010.494607〉
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Contributeur : Denis Roura <>
Soumis le : mardi 8 juillet 2014 - 21:24:20
Dernière modification le : mercredi 20 février 2019 - 15:58:11

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Gregory Pujals, Carlo Cossu, Sebastien Depardon. Forcing large-scale coherent streaks in a zero-pressure-gradient turbulent boundary layer. Journal of Turbulence, Taylor & Francis, 2010, 11 (25), pp.1-13. 〈10.1080/14685248.2010.494607〉. 〈hal-01020663〉

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