Abstract
The focus of the paper is on the performance of approximate RANStype near-wall treatments applied within LES strategies to the simulation of flow separation from curved surfaces at high Reynolds numbers. Two types of combination are considered: a hybrid RANS-LES scheme in which the LES field is interfaced, dynamically, with a full RANS solution in the near-wall layer; and a zonal scheme in which the state of the near-wall layer is described by parabolized Navier-Stokes equations which only return the wall shear stress to the LES domain as a wall boundary condition. In both cases, the location of the interface can be chosen freely. The two methods are applied to a flow separating from the trailing edge of a hydrofoil. A second flow considered is one separating from a three-dimensional hill, for which the performance of the zonal method is contrasted with a fine-grid LES and simulations in which the near-wall layer is treated with log-law-based wall functions.
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Tessicini, F., Li, N., Leschziner, M. (2007). Simulation of Separation from Curved Surfaces with Combined LES and RANS Schemes. In: Kassinos, S.C., Langer, C.A., Iaccarino, G., Moin, P. (eds) Complex Effects in Large Eddy Simulations. Lecture Notes in Computational Science and Engineering, vol 56. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-34234-2_22
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