Flat Plate Boundary Layer By-Pass Transition by Joint Action of Surface Roughness and External Turbulence

0377805 - ÚT 2013 RIV DE eng C - Konferenční příspěvek (zahraniční konf.)
Hladík, Ondřej - Jonáš, Pavel - Mazur, Oton - Uruba, Václav
Flat Plate Boundary Layer By-Pass Transition by Joint Action of Surface Roughness and External Turbulence.
Progress in Turbulence and Wind Energy IV. Berlin, Heidelberg: Springer-Verlag, 2012, s. 205-208. Springer Proceedings in Physics, 141. ISBN 978-3-642-28967-5. ISSN 0930-8989.
[iTi 2010 Conference in Turbulence. Bertinoro (IT), 19.09.2010-22.09.2010]
Grant CEP: GA ČR GA101/08/1112; GA ČR GAP101/10/1230
Výzkumný záměr: CEZ:AV0Z20760514
Institucionální podpora: RVO:61388998
Klíčová slova: boundary layer * laminar - turbulent transition * bypass transition
Kód oboru RIV: BK - Mechanika tekutin

Flat plate boundary layer by-pass transition by joint action of surface roughness and external turbulence is investigated. The transition process is promoted by both free-stream turbulence and surface roughness. Two independent methods for transition region identification are suggested giving the similar results in various situations. The method of determination of the instantaneous values of wall friction on smooth and rough surface is suggested. The distribution of intermittency factor is evaluated from records of the instantaneous values of wall friction. Estimations of onset and the end of the transitional region from intermittency factor are compared with those from distribution of skin friction coefficient.
Trvalý link: http://hdl.handle.net/11104/0217474