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Importance of sub-grid scale modelling for accurate aerodynamic simulations

Ekman, P, Venning, J ORCID: 0000-0002-4097-2168, Virdung, T and Karlsson, M 2020 , 'Importance of sub-grid scale modelling for accurate aerodynamic simulations' , Journal of Fluids Engineering, vol. 143, no. 1 , pp. 1-14 , doi: 10.1115/1.4048351.

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Abstract

The Ahmed body is one of the most well-investigated vehicle bodies for aerodynamic purposes. Despite its simple geometry, the flow around the body, especially at the rear, is very complex as it is dominated by a large wake with strong interaction between vortical structures. In the present study, the flow around the 25° Ahmed body has been investigated using Large Eddy Simulations (LES) and compared to high-resolution particle image velocimetry (PIV) measurements. Special emphasis was put on studying three commonly used Sub-Grid Scale (SGS) models and their ability to capture vortical structures around the Ahmed body. The ability of the SGS models to capture the near-wall behavior and small-scale dissipation is crucial for capturing the correct flow field. Excellent agreement between simulations and PIV measurements were seen when using the dynamic Smagorinsky-Lilly and the Wall-Adopting Local Eddy-Viscosity SGS models, respectively. However, the standard Smagorinsky-Lilly model was not able to capture the flow patterns when compared to the PIV measurements due to shortcomings in the near-wall modelling in the standard Smagorinsky-Lilly model, resulting in overpredicted separation.

Item Type: Article
Authors/Creators:Ekman, P and Venning, J and Virdung, T and Karlsson, M
Keywords: vehicle aerodynamics, computational fluid dynamics
Journal or Publication Title: Journal of Fluids Engineering
Publisher: Asme-Amer Soc Mechanical Eng
ISSN: 0098-2202
DOI / ID Number: 10.1115/1.4048351
Copyright Information:

Copyright 2021 ASME

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