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Spatial hot-wire visualization of the Λ-structure transformation into the turbulent spot on the smooth flat plate surface and riblet effect on this process

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Abstract

Evolution of the Λ-vortex and its transformation into the turbulent spot in a flat plate boundary layer are investigated experimentally. Extensive measurements visualizing the Λ-structure transformation into the turbulent spot on the smooth and ribbed surfaces of the flat plate are presented. The flow behavior in the course of spatial evolution of the Λ-structure and turbulent spot is discussed. Specific features of the downstream evolution of Λ-structure and turbulent spot on the smooth and ribbed surfaces are demonstrated, such as suppression by riblets of the Λ-vortex transformation into the turbulent spot, appearance of the coherent structures of Λ-vortex within ensemble-averaged turbulent spot, and oblique waves generation both by the Λ-vortex and turbulent spot.

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Acknowledgments

This work was supported by the Russian Foundation for Basic Research (grant no. 08-01-00027), the Program of Support for Leading Scientific Schools (NSh-454.2008.1), Ministry of Education and Science of the Russian Federation (project RNP 2.1.2.541) and by grant of the Russian Federation President (MK-420.2008.1).

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Authors and Affiliations

  1. Applied Mechanics, Chalmers University of Technology, 412 96, Gothenburg, Sweden

    Valery G. Chernoray

  2. Institute of Theoretical and Applied Mechanics, SB RAS, 630090, Novosibirsk, Russia

    Genrich R. Grek, Victor V. Kozlov & Yuriy A. Litvinenko

Authors
  1. Valery G. Chernoray
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  2. Genrich R. Grek
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  3. Victor V. Kozlov
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  4. Yuriy A. Litvinenko
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Corresponding author

Correspondence to Victor V. Kozlov.

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Chernoray, V.G., Grek, G.R., Kozlov, V.V. et al. Spatial hot-wire visualization of the Λ-structure transformation into the turbulent spot on the smooth flat plate surface and riblet effect on this process. J Vis 13, 151–158 (2010). https://doi.org/10.1007/s12650-009-0004-7

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  • DOI: https://doi.org/10.1007/s12650-009-0004-7

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