Dynamics of turbulent spots in transitional boundary layer

0370280 - ÚT 2012 RIV GB eng J - Článek v odborném periodiku
Hladík, Ondřej - Jonáš, Pavel - Uruba, Václav
Dynamics of turbulent spots in transitional boundary layer.
Journal of Physics: Conference Series. Roč. 318, č. 032028 (2011), s. 1-5. ISSN 1742-6588. E-ISSN 1742-6596.
[European turbulence conference /13./. Warsaw, 12.09.2011-15.09.2011]
Grant CEP: GA ČR GA101/08/1112; GA ČR GAP101/10/1230
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: boundary layer transition * hairpin vortex * calmed region
Kód oboru RIV: BK - Mechanika tekutin
http://iopscience.iop.org/1742-6596/318/3/032028?fromSearchPage=true

The turbulent spots appearance, topology and dynamics on a at-plate boundary layer in zero pressure gradient during its transition to turbulence is investigated experimentally using time-resolved PIV technique. The intermittently appearing turbulent spots are subjected to detailed study. The hairpin packets organized in regular streamwise rows having fractal structure in the same time are identied in spots. Elongated vortical structures have been recognized in the spots rear-part. The calmed region is characterized by presence of low-velocity streaks originating between the elongated structures.
Trvalý link: http://hdl.handle.net/11104/0204126