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Title: The Influence of Velocity Ratio on the Evolution of Streamwise Vortices in the Simulated Plane Mixing Layer
Authors: McMullan, WA
Hug, SN
First Published: 22-Feb-2019
Publisher: Elsevier for European Mechanics Society (Euromech)
Citation: European Journal of Mechanics - B/Fluids, 2019, 76 pp. 166–177
Abstract: In this paper we perform Large Eddy Simulations of the plane turbulent mixing layer, to assess the effect of the velocity ratio parameter on the evolution of the streamwise vortex structure in the flow. The mixing layers originate from a physically-correlated inflow condition. A simulation performed against reference experimental flow conditions produces reliable flow statistics, and the velocity ratio parameter is subsequently varied by changing the low-speed freestream velocity of the flow. It is found that the residual streamwise vorticity in the flow upstream of the splitter plate is amplified, and subsequently realigns into a single row of spatially stationary streamwise vortices. The distance required for this realignment process decreases with increasing values of the velocity ratio parameter. Once formed, the average spacing of the spatially stationary streamwise vortices evolves in a stepwise fashion, with the overall spanwise wavelength of the streamwise structure scaling linearly with the local vorticity thickness. This scaling is independent of the velocity ratio parameter for all values tested here.
DOI Link: 10.1016/j.euromechflu.2019.02.007
ISSN: 0997-7546
eISSN: 1873-7390
Embargo on file until: 22-Feb-2020
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2019 Elsevier Masson SAS. After an embargo period this version of the paper will be an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Description: The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, Dept. of Engineering

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