Abstract
An array of cylindrical roughness elements is used to attenuate Tollmien-Schlichting (TS) waves and to delay laminar-to-turbulent transition. The experiments in this work are conducted in a laminar water channel to confirm the stabilizing effect known from wind-tunnel experiments [6]. As a result of this passive flow-control method, the transition location could be delayed by approximately \(20\%\) compared to the undisturbed flow. A Fourier decomposition reveals that both fundamental and harmonic components of the controlled TS waves are attenuated. These experiments therefore confirm the effectiveness of this method and further provide the foundations for future investigations.
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Acknowledgments
We thank Markus J. Kloker for his always inspiring discussions, in particular on mean-flow distortion.
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Puckert, D.K., Rist, U. (2020). Transition Delay with Cylindrical Roughness Elements in a Laminar Water Channel. In: Dillmann, A., Heller, G., Krämer, E., Wagner, C., Tropea, C., Jakirlić, S. (eds) New Results in Numerical and Experimental Fluid Mechanics XII. DGLR 2018. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 142. Springer, Cham. https://doi.org/10.1007/978-3-030-25253-3_22
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