magstreamvort.pdf (4.52 MB)
Download file

The effect of boundary layer fluctuations on the streamwise vortex structure in simulated plane turbulent mixing layers

Download (4.52 MB)
journal contribution
posted on 02.10.2017, 09:54 by William Andrew McMullan
This paper details the influence of the magnitude of imposed inflow fluctuations on Large Eddy Simulations of a spatially developing turbulent mixing layer originating from laminar boundary layers. The fluctuations are physically-correlated, and produced by an inflow generation technique. The imposed high-speed side boundary layer fluctuation magnitude is varied from a low-level, up to a magnitude sufficiently high that the boundary layer can be considered, in a mean sense, as nominally laminar. Cross-plane flow visualisation shows that each simulation contains streamwise vortices in the laminar and turbulent regions of the mixing layer. Statistical analysis of the secondary shear stress reveals that mixing layers originating from boundary layers with low-level fluctuations contain a spatially stationary streamwise structure. Increasing the high-speed side boundary layer fluctuation magnitude leads to a weakening of this stationary streamwise structure, or its removal from the flow entirely. The mixing layer growth rate reduces with increasing initial fluctuation level. These findings are discussed in terms of the available experimental data on mixing layers, and recommendations for both future experimental and numerical research into the mixing layer are made.

History

Citation

International Journal of Heat and Fluid Flow, 2017, 68, pp. 87-101

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

AM (Accepted Manuscript)

Published in

International Journal of Heat and Fluid Flow

Publisher

Elsevier

issn

0142-727X

Acceptance date

29/08/2017

Copyright date

2017

Available date

28/09/2019

Publisher version

http://www.sciencedirect.com/science/article/pii/S0142727X17302254

Notes

The file associated with this record is under embargo until 24 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en

Usage metrics

Categories

Exports