Abstract
The effect of wakes on a separated boundary layer over a flat plate is investigated by direct numerical simulation. The flow separates due to a strong adverse pressure gradient induced by suction along the upper simulation boundary. The forcing Strouhal number St = fLx/Uref of the wakes ranges from 0 to 2.9. Each forcing pulse generates three roll-up vortices, which originate near the separation point and convect with approximately half the local free-stream velocity. The separation and reattachment points vary with the forcing frequency, the size of the separated region is shortened significantly for high forcing frequencies, but no other significant variations of the mean boundary layer properties are observed unless the separation bubble is allowed to fully reform. The separation lengths of the periodic cases can be estimated from a single recovery experiment in which the forcing is suddenly removed.
Original language | English |
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Title of host publication | 9th European Conference on Turbomachinery |
Subtitle of host publication | Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings |
Editors | M. Sen, M. Manna, T. Arts, G. Bois |
Publisher | Istanbul Technical University |
Pages | 109-118 |
Number of pages | 10 |
ISBN (Electronic) | 9789755613901 |
Publication status | Published - 2011 |
Externally published | Yes |
Event | 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Istanbul, Turkey Duration: 21 Mar 2011 → 25 Mar 2011 |
Publication series
Name | 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings |
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Volume | 1 |
ISSN (Print) | 2410-4833 |
Conference
Conference | 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 |
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Country/Territory | Turkey |
City | Istanbul |
Period | 21/03/11 → 25/03/11 |
Bibliographical note
Publisher Copyright:Copyright © 2011 Local Organising Commitee.