Abstract
Direct numerical simulations of the effects of a cylindrical roughness element in the laminar 3-d boundary layer on the upper surface of a swept wing are performed. The roughness element generates streamwise vortices, where one is persistently growing in streamwise direction due to crossflow instability. By varying the roughness height, the onset of secondary instability of this crossflow vortex and ultimate transition to turbulence varies also in streamwise direction. When reaching the “effective”, i.e. the flow-tripping roughness height, the linear crossflow-instability regime is bypassed and breakdown to turbulence occurs in close vicinity to the element due to a global instability.
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Acknowledgments
The financial support by the European Commission through the FP7 project ‘RECEPTivitiy and amplitude-based transition prediction’ (ACPO-GA-2010-265094) and the provision of computational resources by the Federal High Performance Computing Center Stuttgart (HLRS) are gratefully acknowledged.
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© 2014 Springer International Publishing Switzerland
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Kurz, H.B.E., Kloker, M.J. (2014). Effects of a Discrete Medium-Sized Roughness in a Laminar Swept-Wing Boundary Layer. In: Dillmann, A., Heller, G., Krämer, E., Kreplin, HP., Nitsche, W., Rist, U. (eds) New Results in Numerical and Experimental Fluid Mechanics IX. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 124. Springer, Cham. https://doi.org/10.1007/978-3-319-03158-3_18
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DOI: https://doi.org/10.1007/978-3-319-03158-3_18
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