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Effects of roughness elements on bypass transition induced by a circular cylinder wake

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Abstract

The bypass transition of flat-plate boundary layer induced by a circular cylinder wake under the influence of roughness elements is experimentally investigated. The hydrogen-bubble visualization results show that the boundary layer separation occurs upstream of the roughness, and the separated shear layer is incised by roughness to different extent, resulting in different kinds of secondary vortices formed immediately downstream of the roughness. During the evolution of the secondary vortex, two types of instabilities are observed, which are denoted as large- and small-scale instabilities, respectively, according to different spatial scale of the hairpin vortices formed afterward. A merging process of hairpin vortices is also observed when the secondary vortices undergo the small-scale instability, and a potential new transition control strategy based on the present observation is proposed.

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Acknowledgment

This research was funded by National Natural Science Foundation of China under grant number 10832001.

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Authors and Affiliations

  1. Fluid Mechanics Key Laboratory of Education Ministry, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China

    J. J. Wang, C. Zhang & C. Pan

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  1. J. J. Wang
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  2. C. Zhang
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  3. C. Pan
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Correspondence to J. J. Wang.

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Wang, J.J., Zhang, C. & Pan, C. Effects of roughness elements on bypass transition induced by a circular cylinder wake. J Vis 14, 53–61 (2011). https://doi.org/10.1007/s12650-010-0063-9

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  • DOI: https://doi.org/10.1007/s12650-010-0063-9

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