Abstract
The work is devoted to the study of weakly non-linear interactions of Tollmien-Schlichting waves in an incompressible 2D airfoil boundary layer. Selected resonant regimes are investigated with emphasis to the regimes where more than one fundamental T-S wave is present in the flow. The results show that amplification rates of the effective sub-harmonic modes are not affected by modulations in time of the fundamental wave. In addition, modulations of the fundamental wave tend to generate additional modes at the modulation frequency via nonlinear wave interaction. These low frequency modes can act as self generated seeds for subharmonic resonance. The nature of these modes and their downstream evolution is investigated in detail. The observations are in agreement with results obtained for much more complicated case of wave bands. The observed mechanism seems to be a possible route for transition in the case of Natural Laminar Flow airfoils under ‘natural’ environment disturbance conditions.
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De Paula, I.B., Würz, W., Krämer, E., Borodulin, V.I., Kachanov, Y.S. (2013). Introduction of Initial Seeds for Subharmonic Resonance by Modulation of T-S Waves in an Airfoil Boundary Layer. In: Dillmann, A., Heller, G., Kreplin, HP., Nitsche, W., Peltzer, I. (eds) New Results in Numerical and Experimental Fluid Mechanics VIII. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 121. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35680-3_30
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DOI: https://doi.org/10.1007/978-3-642-35680-3_30
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