Abstract
The feasibility of using the elliptic blending Reynolds stress model (EB-RSM) in hybrid RANS-LES methods is investigated in this paper. The advantage of the EB-RSM is that it does not use any geometrical wall distance or wall normal vector information which makes it well suited for application in flows with complex wall geometries. A slight modification to the original EB-RSM is proposed to improve the performance for flows with separation. The model is also extended to a sub-grid scale model for fully resolved LES and several possibilities for use as a hybrid RANS-LES model are presented. The RANS EB-RSM model performed overall well in plane channel flows, the periodic hill flow and the flow over a NACA 4412 airfoil with trailing edge separation. In LES, the EB-RSM model provided very good results in a plane channel flow at low Reynolds number. When used as a zonal hybrid RANS-LES model, the EB-RSM displayed a significant log-layer mismatch although the relevance of the modeled and resolved stresses switched right at the prescribed interface.
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Stoellinger, M., Heinz, S., Saha, P. (2015). Reynolds Stress Closure in Hybrid RANS-LES Methods. In: Girimaji, S., Haase, W., Peng, SH., Schwamborn, D. (eds) Progress in Hybrid RANS-LES Modelling. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 130. Springer, Cham. https://doi.org/10.1007/978-3-319-15141-0_26
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DOI: https://doi.org/10.1007/978-3-319-15141-0_26
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