Change search
ReferencesLink to record
Permanent link

Direct link
Steady three-dimensional streaks and their optimal growth in a laminar separation bubble
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control.ORCID iD: 0000-0001-7864-3071
2006 (English)In: Notes on Numerical Fluid Mechanics and Multidisciplinary Design, ISSN 1612-2909Article in journal (Refereed) Published
Abstract [en]

A laminar separation bubble is formed in a region of adverse pressure gradient on a flat plate by a separating boundary layer that undergoes transition, finally leading to a reattached turbulent boundary layer. Linear amplification of steady threedimensional disturbances in the flow before separation and in the laminar part of such a separation bubble is studied by means of direct numerical simulation and an adjoint-based optimization technique suited to study spatial optimal transient growth. The steady disturbances develop as streaks following their excitation in the region of favorable pressure gradient. At separation and inside the bubble, numerical and experimental results show good agreement with theoretical predictions for the optimal disturbance. The growth rate ofthc steady disturbance is seen to possess a maximum around the spanwise wave length that was found to be a preferred one in the corresponding experiment.

Place, publisher, year, edition, pages
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-155007ScopusID: 2-s2.0-84872818828OAI: diva2:761252

QC 20141106

Available from: 2014-11-06 Created: 2014-10-29 Last updated: 2014-11-06Bibliographically approved

Open Access in DiVA

No full text


Search in DiVA

By author/editor
Henningson, Dan
By organisation
Stability, Transition and Control
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 12 hits
ReferencesLink to record
Permanent link

Direct link