Abstract
Many recent laboratory experiments and numerical simulations support a non-equilibrium dissipation scaling in decaying turbulence before it reaches an equilibrium state. By analyzing a direct numerical simulation (DNS) database of a transitional boundary-layer flow, we show that the transition region and the non-equilibrium turbulence region, which are located in different streamwise zones, present different non-equilibrium scalings. Moreover, in the wall-normal direction, the viscous sublayer, log layer, and outer layer show different non-equilibrium phenomena which differ from those in grid-generated turbulence and transitional channel flows. These findings are expected to shed light on the modelling of various types of non-equilibrium turbulent flows.
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Project supported by the National Natural Science Foundation of China (Nos. 12002318, 11572025, 11772032, and 51420105008) and the Science Foundation of North University of China (No. XJJ201929)
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Liu, F., Fang, L. & Fang, J. Non-equilibrium turbulent phenomena in transitional flat plate boundary-layer flows. Appl. Math. Mech.-Engl. Ed. 42, 567–582 (2021). https://doi.org/10.1007/s10483-021-2728-9
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DOI: https://doi.org/10.1007/s10483-021-2728-9