ASSESSMENT OF TURBULENCE MODELS FOR FLOW SIMULATION AROUND THE AHMED BODY

This paper presents numerical simulations for the prediction of the flow around the Ahmed body, with the 25 • and 35 • slant angles, obtained with the flow solver ISIS-CFD. Two RANS (Reynolds Averaged Navier-Stokes) turbulence models, as the k − ω SST and the EARSM (Explicit Algebraic Stress Model) and two hybrid RANS-LES models, as DES (De-tached Eddy Simulation) and IDDES (Improved Delay Detached Eddy Simulation) models, are used. The use of a hybrid RANS-LES model, and more particularly the IDDES model, offers an advantage over RANS models in term of the force coefficients, and general flow field.