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Influence of an unfavourable pressure gradient on the breakdown of boundary layer streaks

V.V. Kozlov ; Valery Chernoray (Institutionen för tillämpad mekanik, Strömningslära) ; I. Lee ; H.H. Chun
Proc. of the 12th Asian Congress of Fluid Mechanics, Daejeon, Korea, Aug. 17–21 p. 1–4. (2008)
[Konferensbidrag, övrigt]

Breakdown of boundary layer streaks is studied experimentally and compared at zero and adverse (positive) streamwise pressure gradients on a wing under fully controlled experimental conditions. The varicose mode of streak breakdown is found to be a dominant mode in the case of the adverse pressure gradient. A strong influence of pressure gradient upon the development of the streak and the secondary instability is revealed. The unfavourable pressure gradient is shown to alter the critical streak amplitude, the dispersion properties of the streak and the secondary disturbance, as well as attained maximum amplitudes for both the streak and the secondary disturbance.



Denna post skapades 2008-09-25.
CPL Pubid: 74412

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära (2005-2017)

Ämnesområden

Strömningsmekanik

Chalmers infrastruktur