Partially-Averaged Navier–Stokes simulations of flows around two different Ahmed bodies

• Flow around two Ahmed body flows was predicted using technique of Partially Averaged Navies–Stokes (PANS).
• Two different Reynolds numbers and two different angles of the rear end of the body are studied.
• Comparison of the PANS results with the experimental data and LES results showed good agreement.
• PANS simulations show clear advantage compared to the reference LES simulations.

The paper reports a study about the prediction of flows around simplified vehicles using Partially-Averaged Navier–Stokes (PANS). Numerical simulations are performed for two simplified vehicles: a slanted-back Ahmed body at Re = 30,000 and a squared-back Ahmed body at Re = 300,000. A comparison of the resolved and modeled physical flow scales is made with corresponding LES and experimental data for a better understanding of the performance of the PANS model. The PANS model is compared for coarse and fine grid resolutions and it is indicated that even a coarse-grid PANS simulation is able to produce fairly close flow predictions to those from a well-resolved LES simulation. The results indicate the possibility of improvement of the predictions by employing a finer grid resolution.