Abstract
Within the following computational study, Tollmien-Schlichting waves will be simulated behind a step on a laminar profile by direct numerical simulations. The airfoil geometry is designed as a reference-configuration for wind tunnel experiments. The character of the dominating transition mechanism by Tollmien-Schlichting waves allows a 2D approach. A well-validated high-order numerical scheme is chosen, which is adapted for detailed simulations of transitional modes. All simulations of the instabilities were carried out on the original airfoil-geometry by using an entirely resolved step-region. The central part of the airfoil in the open test-section of the DNW-NWB contains an adjustable inset to allow settings of different forward and backward-facing steps, comparable with high-resolution CFD-results. Efficient time-accurate simulations of the TS-mode growth were carried out on extracted CFD-grids of the critical region. Determining growth rates of these modes allow comparison with Linear Stability Theory (LST) and the prediction of the laminar-turbulent transition.
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Acknowledgements
The authors acknowledge the DNW-NWB for providing the wind tunnel data from the ATLATUS-campaign in 2015. We would like to thank Dominic Gloß for valuable discussions. A major part of the study was carried out under the scope of the German Federal research programme for aeronautics LuFo-IV.
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Lüdeke, H., Backhaus, K. (2018). Direct TS-Wave Simulation on a Laminar Wing-Profile with Forward-Facing Step. In: Dillmann, A., et al. New Results in Numerical and Experimental Fluid Mechanics XI. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 136. Springer, Cham. https://doi.org/10.1007/978-3-319-64519-3_25
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DOI: https://doi.org/10.1007/978-3-319-64519-3_25
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