DNS of separated flows under the influence of wakes

A. G. Gungor*, M. P. Simens, J. Jimenez

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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 languageEnglish
Title of host publication9th European Conference on Turbomachinery
Subtitle of host publicationFluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings
EditorsM. Sen, M. Manna, T. Arts, G. Bois
PublisherIstanbul Technical University
Pages109-118
Number of pages10
ISBN (Electronic)9789755613901
Publication statusPublished - 2011
Externally publishedYes
Event9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Istanbul, Turkey
Duration: 21 Mar 201125 Mar 2011

Publication series

Name9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings
Volume1
ISSN (Print)2410-4833

Conference

Conference9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011
Country/TerritoryTurkey
CityIstanbul
Period21/03/1125/03/11

Bibliographical note

Publisher Copyright:
Copyright © 2011 Local Organising Commitee.

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