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Global instability in a laminar boundary layer perturbed by an isolated roughness element

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Abstract

Roughness-induced boundary-layer instabilities are investigated by means of hot-film anemometry in a water channel to provide experimental evidence of a global instability. It is shown that the roughness wake dynamics depends on extrinsic disturbances (amplifier) at subcritical Reynolds numbers, whereas intrinsic, self-sustained oscillations (wavemaker) are suspected at supercritical Reynolds numbers. The critical Reynolds number, therefore, separates between two different instability mechanisms. Furthermore, the critical Reynolds number from recent theoretical results is successfully confirmed in this experiment, supporting the physical relevance of 3-d global stability theory.

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Acknowledgements

The financial support of the Deutsche Forschungsgemeinschaft (DFG) under Reference Number RI 680/32-1 is gratefully acknowledged for enabling this project. We would like to thank J.-C. Robinet and S. Cherubini for fruitful discussions and the unknown reviewers for their comments.

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Authors and Affiliations

  1. Institut für Aerodynamik und Gasdynamik, Pfaffenwaldring 21, 70569, Stuttgart, Germany

    Dominik K. Puckert & Ulrich Rist

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  1. Dominik K. Puckert
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  2. Ulrich Rist
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Correspondence to Dominik K. Puckert.

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Puckert, D.K., Rist, U. Global instability in a laminar boundary layer perturbed by an isolated roughness element. Exp Fluids 59, 48 (2018). https://doi.org/10.1007/s00348-018-2510-7

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  • DOI: https://doi.org/10.1007/s00348-018-2510-7

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