Summary
In the first part of this paper, LES results for a backward-facing step flow (with a fully developed channel flow utilized as a time-dependent inflow condition) are evaluated against a corresponding DNS reference data set (Re h = 3300). The two LES cases (using the dynamic subgrid scale model) differ in the spatial discretization of the numerical solution method, using either a second-order (central) or a 4th-order (compact or Hermitian) scheme.
In the second part of the paper, inflow conditions are presented for LES of the spatial development of the mixing of flow streams having different dominant length scales and levels of turbulent kinetic energy. To provide proper inflow conditions the effects of the turbulence producing grids used in the experiments must be realistically modelled. In the case of a co-flowing plane jet with mean shear (experiment of Raddaoui [2]) the effects of different honey comb grids placed in the central and the co-flowing streams must be modelled, and in a shearless turbulence mixing layer (experiment of Veeravalli and Warhaft [3]) the effects of parallel bar grids were simulated to create the desired shearless mean vertical velocity profile (in addition with different length scales and levels of turbulent energy in the upper and lower half of a channel flow).
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References
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Meri, A., Wengle, H., Schiestel, R. (2001). DNS and LES of a backward-facing step flow using 2nd- and 4th-order spatial discretization and LES of the spatial development of mixing of turbulent streams with non-equilibrium inflow conditions. In: Hirschel, E.H. (eds) Numerical Flow Simulation II. Notes on Numerical Fluid Mechanics (NNFM), vol 75. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-44567-8_16
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DOI: https://doi.org/10.1007/978-3-540-44567-8_16
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