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Dovgal’, A. V.; Katasonov, M. M.; Kozlov, V. V.; Pavlenko, A. M.

Evolution of laminar flow disturbances behind a step on a surface generated by its localized vibrations. (English. Russian original) Zbl 1370.76007

Fluid Dyn. 52, No. 3, 394-400 (2017); translation from Izv. Ross. Akad. Nauk, Mekh. Zhidk. Gaza 2017, No. 3, 63-70 (2017).
Summary: The formation and development of hydrodynamic disturbances generated by low-frequency vibrations of a local region on a flat plate behind a rectangular step in separated flow is investigated in a wind tunnel. The results are obtained at a small subsonic flow velocity using the hot-wire anemometry. It is established that the wall vibrations induce separation zone disturbances representing streaky structures accompanied by wave oscillation packets. Laminar boundary layer separation favors the wave packet growth followed by wall flow turbulization.

MSC:

76-05 Experimental work for problems pertaining to fluid mechanics
76G25 General aerodynamics and subsonic flows
76F06 Transition to turbulence

Keywords:

hydrodynamic stability; flow separation; transition to turbulence; streaky structure; wave packet
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References:

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