Streamwise vortices in plane mixing layers originating from laminar or turbulent initial conditions

William A. McMullan, Stephen J. Garrett

Research output: Chapter in Book/Published conference outputConference publication


Large Eddy Simulations of the plane mixing layer have been performed, for the purpose of educing the streamwise vortex structure that may exist in these flows. Both an initially-laminar and initially-turbulent mixing layer are considered in this study. The initially-laminar flow originates from Blasius profiles with a white noise fluctuation environment, whilst the initially turbulent flow has an inflow condition obtained from an inflow turbulence
generation method. Both simulations produce good mean flow statistics when compared with reference experimental data. The simulations capture the change in growth rate when the initial conditions are either laminar or turbulent. Flow visualisation images demonstrate that both mixing layers contain organised turbulent coherent structures, and that the structures contain rows of streamwise vortices distributed across the span of the mixing layer. Ensemble averaging of the cross-plane data, however, shows no evidence for statistically stationary streamwise vortices in either simulation.
Original languageEnglish
Title of host publication53rd AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages17
ISBN (Electronic)9781624103438
Publication statusPublished - 2 Jan 2015
Event53rd AIAA Aerospace Sciences Meeting - Kissimmee, United States
Duration: 5 Jan 20159 Jan 2015


Conference53rd AIAA Aerospace Sciences Meeting
Country/TerritoryUnited States


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