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International Journal of Fluid Mechanics Research

Publicado 6 números por año

ISSN Imprimir: 2152-5102

ISSN En Línea: 2152-5110

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BOUNDARY LAYER PERTURBATIONS GENERATED BY LOCALLY DEFORMABLE SURFACE

Volumen 46, Edición 4, 2019, pp. 325-335
DOI: 10.1615/InterJFluidMechRes.v46.i4.40
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SINOPSIS

Structure of eigen perturbations in a boundary layer is multiform even on a flat smooth surface varying from the Tollmien-Schlichting flat wave to complex three-dimensional vortex structures. All these perturbations either singly or in various combinations are responsible for sequence of transition stages to turbulence. Even successful efforts to control the transition process lead, as a rule, to a certain transformation of the process either in time or in space, but anyway, transition to turbulence is unavoidable. At the same time, by controlling vortex flow structure in a turbulent boundary layer formed over surfaces (LEBU, riblets, MEMs, compliant coating) one can change their integral characteristics. This presentation is focused on the numerical investigation of the development and transformation of forced perturbations in the boundary layer on the flat rigid surface based on direct numerical simulation of unsteady three-dimensional Navier-Stokes equations in a wide range of Reynolds numbers. Nonlinear analysis of the development of these regular local perturbations in terms of wavelength, phase speed and amplitude demonstrates a mandatory transition to irregular perturbations through a sequence of three-dimensional longitudinal coherent vortex structures at Reynolds numbers greater than the transitional ones. Sequence of transformations, structure, intensity, scale and life-time of these three-dimensional vortex structures can be controlled in the boundary layer by changing the parameters of forced local disturbances on the surface.

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