Modelling of natural and bypass transition in aerodynamics

0434822 - ÚT 2015 RIV FR eng C - Conference Paper (international conference)
Fürst, J. - Straka, P. - Příhoda, Jaromír
Modelling of natural and bypass transition in aerodynamics.
EFM 2013 - Experimental Fluid Mechanics 2013. Kutná Hora: E D P Sciences, 2014 - (Vít, T.; Dančová, P.; Novotný, P.). EPJ Web of Conferences, 67. ISBN 978-80-260-5375-0. ISSN 2101-6275.
[Experimental Fluid Mechanics 2013. Kutná Hora (CZ), 19.11.2013-22.11.2013]
R&D Projects: GA ČR(CZ) GAP101/10/1329; GA ČR GAP101/12/1271
Institutional support: RVO:61388998
Keywords : turbulence modelling * laminar/turbulent transition * free stream turbulence
Subject RIV: BK - Fluid Dynamics

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 (2010) 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 (1948). Further, the three-equation k-kL-omega model proposed by Walters and Cokljat (2008) 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.
Permanent Link: http://hdl.handle.net/11104/0239693