A transition prediction model for boundary layers subjected to free-stream turbulence |
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| Institution: | 1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA;2. Graduate Aerospace Laboratories, California Institute of Technology, Pasadena, CA 91125, USA;1. IWS, Department of Hydromechanics and Modelling of Hydrosystems, University of Stuttgart, Germany;2. Institute of Petroleum Engineering, Heriot-Watt University, Edinburgh, United Kingdom;1. KU Leuven, Department of Computer Science, Celestijnenlaan 200A, 3001 Leuven, Belgium;2. KU Leuven, Department of Mathematics, Celestijnenlaan 200B, 3001 Leuven, Belgium |
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| Abstract: | The modifications of the mean and fluctuating characteristics of laminar boundary layers subjected to free stream turbulence (FST) are investigated numerically. In the region upstream of the transition onset, the fluctuations inside the boundary layer are dominated by elongated structures growing downstream in amplitude. These streaky structures, also called Klebanoff or breathing modes, are crucial to the transition process. A linear and parabolic approach, inspired by the hydrodynamic stability theory, is used to describe the streaks dynamic. The model is then applied to predict the transition position. The results are compared to experimental data, with various boundary conditions, including ERCOFTAC test cases. |
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