Abstract
Some properties of large-scale structures in supersonic turbulent flows are examined through experiments. The large eddies considered here include energetic scales, which contribute predominantly to, say, turbulent energy and coherent structures. Different features are presented, such as the level of energy in supersonic free shear flows, the average size of energetic structures, and their characteristic timescales. It is shown that compressibility affects the level of velocity and the size of the energetic eddies, but in many common supersonic situations, the estimation of the timescales can be made from rules valid for solenoidal turbulence. Some implications for compressible turbulence modeling are suggested. Finally, the properties of coherent structures are considered in the case of mixing layers and in a separated shock/boundary layer interaction. Some features relative to the organization of the large eddies are given and the importance of the shock motion is discussed in relation to the shock/layer interaction.
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Dussauge, J. Compressible Turbulence and Energetic Scales: What Is Known from Experiments in Supersonic Flows?. Flow, Turbulence and Combustion 66, 373–391 (2001). https://doi.org/10.1023/A:1013585413220
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DOI: https://doi.org/10.1023/A:1013585413220