An URANS Simulation of the Kelvin-Helmholtz Aerodynamic Effect over the Ahmed Body

The reduction of energy consumption cars is always a significant issue in automotive design. Turbulent flow around car body very difficult to simulate accurately due the complexity conditions body, such as complex separation and laminar turbulent transition. In particular, over Ahmed with rear angle 25o considered challenging problem for RANS approach two-equation turbulence models. this study, we aim analyze Kelvin-Helmholtz instability associated URANS approach. Methodology utilizing method fully discussed. predicted velocity profiles drag coefficient are com-pared experimental results. Three models, k-ε, k-ω SST assessed validated data. study evaluate performance these models Kel-vin-Helmholtz bodies generally us-ing data their validations. It found that proper numerical treatment can perform well or even better than LES. And model shows best compared other