Modification of an algebraic bypass-transition model in region near the stagnation point

0361276 - ÚT 2012 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Straka, P. - Příhoda, Jaromír
Modification of an algebraic bypass-transition model in region near the stagnation point.
Conference Topical Problems of Fluid Mechanics 2011. Prague: Institute of Thermomechanics AS CR, v. v. i., 2011 - (Příhoda, J.; Kozel, K.), s. 105-108. ISBN 978-80-87012-32-1.
[Topical Problems of Fluid Mechanics 2011. Praha (CZ), 16.02.2011-17.02.2011]
Grant CEP: GA ČR(CZ) GAP101/10/1329
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: bypass transition modelling * k-omega turbulence model * flow near the stagnation point
Kód oboru RIV: BK - Mechanika tekutin

An algebraic model of bypass transition was applied for the numerical simulation of flow over the NACA 0012 airfoil. The system of governing equations is formed by the averaged Navier-Stokes equations closed by the k-omega turbulence model. The intemittent character of the transitional flow is described by the algebraic relation for the intermittency coefficient and by empirical relations for the onset and the length of the transition region. The constitutive relation for the turbulent velocity was modified to improve the prediction near the wall and near the leading edge. The prediction of transitional flow was carried out for the Reynolds number Re = 6x10^5 and free stream turbulence Tu = 0.3%. The agreement of numerical results with experimental data is quite good.
Trvalý link: http://hdl.handle.net/11104/0198630