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On Streamwise Vortices in Large Eddy Simulations of Initially Laminar Plane Mixing Layers

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journal contribution
posted on 2016-02-18, 12:27 authored by William Andrew McMullan, Stephen J. Garrett
This paper details the influence of the nature of imposed inflow fluctuations on Large Eddy Simulations of a spatially developing turbulent mixing layer originating from laminar boundary layers. A simulation with imposed white-noise random fluctuations, commonly used in numerical simulations, produces mean-flow statistics that agree well with reference experimental data. Whilst flow visualisation images show evidence for streamwise vorticity in this simulation, quantitative statistics do not reveal the presence of statistically stationary streamwise vortices. A further simulation that uses physically-correlated inflow fluctuations also produces good mean-flow statistical agreement with reference data. From secondary shear stress contours it can be inferred that this simulation does, however, predict the presence of statistically stationary streamwise vortices. The properties of the streamwise vortices are in good agreement with experimental data. The data presented here indicate that, even for initially laminar conditions, plane mixing layer simulations require accurate physically correlated inflow conditions in order to reproduce the flow features found experimentally.

History

Citation

International Journal of Heat and Fluid Flow, 2016, 59, pp.20-32

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

2016-01-26

Copyright date

2016

Available date

2018-02-17

Publisher version

http://www.sciencedirect.com/science/article/pii/S0142727X16300017

Notes

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

Language

en

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