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Stabilization of Tollmien-Schlichting waves by finite amplitude optimal streaks in the Blasius boundary layer
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0002-4346-4732
2002 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 14, no 8, L57-L60 p.Article in journal (Refereed) Published
Abstract [en]

In this Letter we show by numerical simulation that streamwise streaks of sufficiently large amplitude are able to stabilize Tollmien-Schlichting waves in zero pressure gradient boundary layers at least up to Re=1000. This stabilization is due to the spanwise averaged part of the nonlinear basic flow distortion induced by the streaks and occurs for streak amplitudes lower than the critical threshold beyond which secondary inflectional instability is observed. A new control strategy is implemented using optimal perturbations in order to generate the streaks.

Place, publisher, year, edition, pages
2002. Vol. 14, no 8, L57-L60 p.
Keyword [en]
localized disturbances, bypass transition, instability, turbulence
URN: urn:nbn:se:kth:diva-21755DOI: 10.1063/1.1493791ISI: 000177043000001OAI: diva2:340453
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Brandt, Luca
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