Comparison of three hybrid turbulence models for the flow around a 25∘ Ahmed body

Abstract

The flow around the 25 ∘ Ahmed body has been studied computationally by applying different methods including an improved URANS formulation, the SAS model and two popular hybrid RANS/LES formulations: DDES and SBES models. All of the turbulence models employ the underlying SST RANS formulation. These hybrid models show a good prediction for the drag coefficient, with an error between 0–4% compared to experiments, whereas the discrepancy is slightly more important for the lift coefficient. The DDES model shows the best representation of the flow features between all the models studied.