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The influence of periodic excitation on a turbulent separation bubble
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control.ORCID iD: 0000-0001-7864-3071
2006 (English)In: Flow Turbulence and Combustion, ISSN 1386-6184, E-ISSN 1573-1987, Vol. 76, no 1, 1-21 p.Article in journal (Refereed) Published
Abstract [en]

Turbulent separation limits the performance in many engineering applications, for example creating pressure losses in diffuser like flows or stall on aircraft wings. In the present study the turbulent boundary layer flow over a flat plate separating due to an adverse pressure gradient is studied as a model problem and the effect of periodic excitation in both time and space is investigated through direct numerical simulations. Linear stability analysis is used to analyse the sensitivity of the flow with respect to time-periodic excitations. The dependence on position, amplitude and frequency of the forcing is investigated. For a certain frequency range at sufficiently high amplitudes, it is possible to eliminate the separated region. Furthermore, three-dimensional effects are studied by applying a steady spanwise forcing as well as a both time-dependent and spanwise varying forcing. A forcing varying in spanwise direction is shown to be the most effective in eliminating the separated region, whereas two-dimensional time-periodic excitation was not as efficient as it was expected.

Place, publisher, year, edition, pages
2006. Vol. 76, no 1, 1-21 p.
Keyword [en]
turbulent boundary layer, separation, periodic excitation, direct numerical-simulation, boundary-layer separation, backward-facing step, flow separation, reattachment, vicinity, mild
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-15487DOI: 10.1007/s10494-005-9004-4ISI: 000235748700001Scopus ID: 2-s2.0-33644674514OAI: oai:DiVA.org:kth-15487DiVA: diva2:333528
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Numerical Studies of Turbulent and Separeted Flows
Open this publication in new window or tab >>Numerical Studies of Turbulent and Separeted Flows
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2006. x, 36 p.
Series
Trita-MEK, ISSN 0348-467X ; 2006:12
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-4044 (URN)
Public defence
2006-06-16, Sal F3, Lindstedtsvägen 26, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20100830Available from: 2006-06-08 Created: 2006-06-08 Last updated: 2010-08-30Bibliographically approved

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Henningson, Dan S.

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