On streamwise vortices in Large Eddy Simulations of initially laminar plane mixing layers |
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| Affiliation: | 1. Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi Kohoku-ku, Yokohama, Kanagawa, 223-8522, Japan;2. Lehrstuhl für Aerodynamik und Strömungsmechanik, Technische Universität München, Boltzmannstr. 15, Garching 85748, Germany;1. Department of Mechanical and Aerospace Engineering, Monash University, VIC 3800, Australia;2. IRPHE, CNRS, and Aix–Marseille Université, 49 Rue Joliot-Curie, 13013 Marseille, France;3. Department of Mechanical and Product Design Engineering, Swinburne University of Technology, VIC 3122, Australia;4. School of Mathematical and Statistical Sciences, Arizona State University, Tempe, AZ 85287, USA;1. Institute of Automotive Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Institute of Automotive Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;1. School of Aerospace Engineering, Xiamen University, Xiamen 361005, PR China;2. College of Mechanical Engineering, Tongji University, Shanghai 201804, PR China |
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| Abstract: | 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. |
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