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Importance of sub-grid scale modelling for accurate aerodynamic simulations


Ekman, P and Venning, J and Virdung, T and Karlsson, M, Importance of sub-grid scale modelling for accurate aerodynamic simulations, Journal of Fluids Engineering, 143, (1) Article FE-19-1268. ISSN 0098-2202 (2020) [Refereed Article]

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Copyright 2021 ASME

DOI: doi:10.1115/1.4048351


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 Details

Item Type:Refereed Article
Keywords:vehicle aerodynamics, computational fluid dynamics
Research Division:Engineering
Research Group:Fluid mechanics and thermal engineering
Research Field:Fluid mechanics and thermal engineering not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Venning, J (Dr James Venning)
ID Code:141105
Year Published:2020
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2020-09-25
Last Modified:2020-10-19

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