Modelling of natural and bypass transition in aerodynamics
1 Faculty of Mechanical Engineering, Czech Technical University in Prague, Czech Republic
2 Aerospace Research and Test Establishment, Plc, Prague, Czech Republic
3 Institute of Thermomechanics AS CR, v.v.i., Prague, Czech Republic
a Corresponding author: Jiri.Furst@fs.cvut.cz
Published online: 25 March 2014
Most of transition models are proposed for modelling of the bypass transition common in the internal aerodynamics especially in turbomachinery where free stream turbulence is the dominant parameter affecting the transition onset. Free-stream turbulence level in the external aerodynamics is usually noticeably lower and so the natural transition often occurs in flows around airfoils. The transition model with the algebraic equation for the intermittency coefficient proposed originally by Straka and Příhoda  for the bypass transition was modified for modelling of the transition at low free-stream turbulence. The modification is carried out using experimental data of Schubauer and Skramstad . Further, the three-equation k-kL-ω model proposed by Walters and Cokljat  was used for the modelling of the transition at low free-stream turbulence. Both models were tested by means of the incompressible flow around airfoils at moderate and very low free-stream turbulence.
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