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Numerical studies of streak instability in boundary layers
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-4346-4732
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-7864-3071
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2006 (English)In: Sixth IUTAM Symposium on Laminar-Turbulent Transition / [ed] Govindarajan, R, DORDRECHT: SPRINGER , 2006, Vol. 78, 121-126 p.Conference paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
DORDRECHT: SPRINGER , 2006. Vol. 78, 121-126 p.
Keyword [en]
instability, boundary layer, streamwise streaks
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-42090ISI: 000236905600013ScopusID: 2-s2.0-84859846268ISBN: 1-4020-3459-8OAI: diva2:446086
6th IUTAM Symposium on Laminar-Turbulent Transition. Bangalore, INDIA. DEC 13-17, 2004
QC 20111006Available from: 2011-10-06 Created: 2011-10-05 Last updated: 2011-10-06Bibliographically approved

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