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Dynamics of turbulent spots in transitional boundary layer
- 1.0368985 - ÚT 2012 PL eng C - Conference Paper (international conference)
Hladík, Ondřej - Jonáš, Pavel - Uruba, Václav
Dynamics of turbulent spots in transitional boundary layer.
13th European turbulence conference. Warsaw, Poland: University of Warsaw, 2011 - (Bajer, K.; Kopeč, J.; Podziemski, P.), s. 1-5. ISSN N.
[European turbulence conference /13./. Warsaw (PL), 12.09.2011-15.09.2011]
R&D Projects: GA ČR GA101/08/1112; GA ČR GAP101/10/1230
Institutional research plan: CEZ:AV0Z20760514
Keywords : boundary layer transition * hairpin vortex * calmed region
Subject RIV: BK - Fluid Dynamics
www.etc13.fuw.edu.pl
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.
Permanent Link: http://hdl.handle.net/11104/0203169
Number of the records: 1