Abstract
Direct numerical simulations (DNS) of laminar to turbulent transition in presence of free-stream turbulence (FST) on a laminar flow airfoil are performed. The present article briefly explains the generation of a synthetic turbulent inflow by superimposing modes of the continuous spectrum resulting from linear stability analysis. A bypass transition scenario on a Blasius boundary layer is selected for validation of the method. The approach is extended and applied for the simulation of transition with Tollmien-Schlichting (TS) waves with low turbulence intensities (\(Tu\le 0.1\%\)) by matching the energy spectrum to measurements of corresponding experimental investigations. Results are discussed and compared with predictions of the \(e^N\)-method.
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Ohno, D., Romblad, J., Rist, U. (2020). Laminar to Turbulent Transition at Unsteady Inflow Conditions: Direct Numerical Simulations with Small Scale Free-Stream Turbulence. 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_21
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DOI: https://doi.org/10.1007/978-3-030-25253-3_21
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