V.V.Kozlov On nonlinear mechanisms of instability in boundary layers |
Applied hydromechanics, Vol. 7 (79) ¹ 3-4, (2005) |
| There are presents the results of analysis of sinusoidal and varicose instability of streaky structures on the nonlinear stage of laminar-turbulent process in shear flows. Discussed is the behavior of the flow during the process of spatial evolution of streaky structures with generated on them secondary high-frequency perturbation. Considered are various scenarios of appearance and development of coherent vortical structures investigated in both physical and numerical experiments. Shown are details of sinusoidal and varicose cases of destruction of steady longitudinal streaky structure, such as modulations of the structure in transversal and longitudinal directions by the secondary perturbation frequency, appearance of new streaky structures downstream, and appearance and spatial development of unsteady formations of the kind of L-structure in both cases. |
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| TEXT LANGUAGE: Russian |