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Importance of Sub-G...
Importance of Sub-Grid Scale Modeling for Accurate Aerodynamic Simulations
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- Ekman, Petter, 1988- (författare)
- Linköpings universitet,Mekanisk värmeteori och strömningslära,Tekniska fakulteten
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- Venning, James (författare)
- Department of Mechanical and Aerospace Engineering, Monash University, Victoria, Australia
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- Virdung, Torbjörn (författare)
- Volvo Car Corporation Department, Göteborg, Sweden
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- Karlsson, Matts, 1965- (författare)
- Linköpings universitet,Mekanisk värmeteori och strömningslära,Tekniska fakulteten
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(creator_code:org_t)
- 2020-10-13
- 2021
- Engelska.
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Ingår i: Journal of Fluids Engineering. - : ASME. - 0098-2202 .- 1528-901X. ; 143:1
- Relaterad länk:
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https://liu.diva-por... (primary) (Raw object)
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https://asmedigitalc...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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 this study, the flow around the 25 deg Ahmed body has been investigated using large eddy simulations 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. Very good 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 modeling in the standard Smagorinsky-Lilly model, resulting in overpredicted separation.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
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- ref (ämneskategori)
- art (ämneskategori)
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