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LARGE-EDDY SIMULATION USING THE EXPLICIT ALGEBRAIC SUBGRID MODEL IN COMPLEX GEOMETRIES

Amin Rasam
Linne FLOW Center, Department of Mechanics Royal institute of technology Osquars Backe 18, Stockholm, Sweden

Stefan Wallin
Linne FLOW Center, Department of Mechanics Royal institute of technology Osquars Backe 18, Stockholm, Sweden

Geert Brethouwer
Linne FLOW Centre, KTH Mechanics Royal Institute of Technology 100 44 Stockholm, Sweden

Arne V. Johansson
Linne FLOW Centre, Dept. of Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

Abstract

In Rasam et al. (2011) we compared the performance of the explicit algebraic subgrid-scale (SGS) model (EASSM) (Marstorp et al., 2009) with that of the conventional dynamic Smagorinsky model (DSM) in large eddy simulation (LES) of channel flow using a pseudo-spectral Navier−Stokes solver. We showed that, due to the better prediction of the individual SGS stresses in a wide range of grid resolutions and due to the nonlinear SGS stress contribution by the model, the EASSM predictions were less resolution dependent and more accurate than those of the DSM. As the first step in this study towards LES in complex geometries, we extend our previous study and perform LES of turbulent channel flow at Reτ = 590 using the EASSM and the code_Saturne, which is an unstructured finite volume solver suitable for LES in complex geometries. The results are compared to those of the DSM and show that the EASSM predictions of the wall shear and the Reynolds stresses are more accurate. LES results using the EASSM obtained from the code_Saturne are also compared to those obtained using the pseudo-spectral solver obtained in our previous study (Rasam et al., 2013). As the next step, we are performing LES of flow over periodic hill using the EASSM and the code_Saturne. The results will be compared with those of the DSM and the reference LES and will be presented at the conference.