Assessment of hybrid RANS-LES formulations for flow simulation around the Ahmed body

•Investigations of RANS and hybrid RANS-LES models for the Ahmed body.•Accurate prediction of the flow for the slant angle 35° by all turbulence models.•Failure of RANS models to predict the flow for the slant angle 25°.•Better prediction of the flow for the slant angle 25° with the hybrid RANS-LES...

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Bibliographic Details
Published in:Computers & fluids 2018-11, Vol.176, p.302-319
Main Authors: Guilmineau, E., Deng, G.B., Leroyer, A., Queutey, P., Visonneau, M., Wackers, J.
Format: Article
Language:English
Subjects:
Ahmed body
Computational fluid dynamics
Computer Science
Computer simulation
DES models
Detached eddy simulation
Distributed, Parallel, and Cluster Computing
Engineering Sciences
Flow simulation
Fluid flow
Fluid mechanics
Formulations
IDDES
ISIS-CFD
Large eddy simulation
Mathematics
Mechanics
Numerical Analysis
Physics
RANS
Reynolds number
Simulation
Structural mechanics
Turbulence
Turbulence models
Vortices
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Summary:•Investigations of RANS and hybrid RANS-LES models for the Ahmed body.•Accurate prediction of the flow for the slant angle 35° by all turbulence models.•Failure of RANS models to predict the flow for the slant angle 25°.•Better prediction of the flow for the slant angle 25° with the hybrid RANS-LES models.•IDDES model: only model to predict the bubble recirculation on the slant. This paper presents an investigation of RANS and DES models for the Ahmed body with 25° and 35° slant angles. The Reynolds number, based on the height of the model and the upstream velocity, is 7.68× 105. Two RANS (Reynolds Averaged Navier–Stokes) models are used: the k−ω SST of Menter and the EARSM (Explicit Algebraic Stress Model), based on the k−ω model. Two hybrid RANS-LES (Large Eddy Simulation) models are used: a DES (Detached Eddy Simulation) and an IDDES (Improved Delay Detached Eddy Simulation). These hybrid models are also based on the k−ω model. The flow for the slant angle 35° is well predicted by all turbulence models with a slight advantage for the IDDES model. For the flow with the slant angle 25°, only the IDDES hybrid RANS-LES model predicts the recirculation bubble on the slant. It is concluded that the IDDES model is the only turbulence model that gives good agreements with the experimental data.
ISSN:0045-7930
1879-0747
DOI:10.1016/j.compfluid.2017.01.005