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Book Sections Fluid Mechanics and its Applications Year : 2006

Numerical studies of streak instability in boundary layers

Abstract

Numerical results on the stability of boundary layers in the presence of streaks, assumed steady and spanwise periodic, are presented. The instability features are retrieved both from stability analysis and from the numerical simulation of the flow impulse response. It is found that the presence of streaks of moderate amplitudes is able to quench the viscous Tollmien-Schlichting waves. However, a threshold exists beyond which secondary inflectional instabilities occur. Streaky basic flows unstable to both sinuous and varicose perturbations are considered. To gain physical understanding of the instability mechanisms the equation for the perturbation kinetic energy is analysed. To investigate the sinuous instability modes an analytical model streak is also proposed. © 2006 Springer.
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Dates and versions

hal-01023364 , version 1 (16-07-2014)

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  • HAL Id : hal-01023364 , version 1

Cite

L. Brandt, Carlo Cossu, D.S. Henningson, Jean-Marc Chomaz, Patrick Huerre. Numerical studies of streak instability in boundary layers. Rama Govindarajan. IUTAM Symposium on Laminar-Turbulent Transition, 78 (-), Springer, pp.121-126, 2006, Fluid Mechanics and Its Applications, 978-1-4020-3459-6. ⟨hal-01023364⟩
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