Numerical studies of streak instability in boundary layers

L. Brandt 1 Carlo Cossu 2 D.S. Henningson 1 Jean-Marc Chomaz 2 Patrick Huerre 2
1 KTH Mechanics, SE-100 44 Stockholm, Sweden
2 LadHyX - Laboratoire d'hydrodynamique
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.
Type de document :
Chapitre d'ouvrage
Rama Govindarajan. IUTAM Symposium on Laminar-Turbulent Transition, 78 (-), Springer, pp.121-126, 2006, Fluid Mechanics and Its Applications, 978-1-4020-3459-6
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https://hal-polytechnique.archives-ouvertes.fr/hal-01023364
Contributeur : Denis Roura <>
Soumis le : mercredi 16 juillet 2014 - 15:28:35
Dernière modification le : mercredi 25 avril 2018 - 10:45:03

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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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