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Spanwise domain effects on streamwise vortices in the plane turbulent mixing layer

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journal contribution
posted on 2018-03-22, 10:40 authored by W. A. McMullan
Large Eddy Simulation is used to assess the influence of the spanwise domain extent on the evolution of the spatially stationary streamwise structure that exists in the simulated plane turbulent mixing layer. The mixing layers originate from a physically-correlated inflow condition, which produces accurate mixing layer mean flow statistics. For all three spanwise domains considered a spatially stationary streamwise structure is present. The streamwise structure is artificially confined when its wavelength matches that of the spanwise domain extent, and a criterion for confinement is postulated. The confinement has no significant negative impact on either the computed flow statistics, or the growth of the large-scale spanwise structures. These results demonstrate that the streamwise structure rides passively on the large-scale spanwise vortex structure. A simulation lacking in a spanwise direction produces poor turbulence statistics, and is not a reliable representation of the real mixing layer flow

History

Citation

European Journal of Mechanics - B/Fluids, 2017, 67, pp 385-396

Author affiliation

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

Version

  • AM (Accepted Manuscript)

Published in

European Journal of Mechanics - B/Fluids

Publisher

Elsevier

issn

0997-7546

Acceptance date

2017-10-09

Copyright date

2017

Available date

2018-03-22

Publisher version

https://www.sciencedirect.com/science/article/pii/S0997754616305842?via=ihub

Language

en