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Published in:
2020 | OriginalPaper | Chapter
Hybrid RANS/LES of an Adverse Pressure Gradient Turbulent Boundary Layer Using an Elliptic Blending Reynolds Stress Model and Anisotropic Linear Forcing
Authors : Lars Erbig, Sylvain Lardeau
Published in: Progress in Hybrid RANS-LES Modelling
Publisher: Springer International Publishing
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Abstract
Scale-resolving simulations of turbulent boundary layers (TBLs) still imply high computational costs which limit their applicability to realistic industry problems. A typical strategy to overcome this issue is a restriction of the scale-resolving simulation to a computational sub-domain. Here, we investigate the suitability of a hybrid RANS/LES based on an Elliptic-Blending Reynolds Stress Model (EB-RSM) RANS and turbulence synthetization in the LES sub-domain with Anisotropic Linear Forcing (ALF) to an adverse pressure gradient (APG) TBL case that was experimentally investigated by Hu and Herr. We compare different application strategies and show that the hybrid RANS/LES is capable to consistently predict the measured mean velocity profiles, stresses and wall pressure spectra with a coarser mesh and time-step choice than typically recommended for wall-resolved LES. An open point of research remains the quality of the ALF target fields, from the EB-RSM, in the APG region.