This paper presents a numerical investigation of the flow around the Ahmed model. This is an automotive-type configuration with a rear slanted part. Experiments have been performed for different angles ip of the slanted part, and have shown a maximum of the aerodynamic drag when ip = 30°. This angle corresponds to a change in the structure of the wake developing on the rear part of the body. Numerical simulations have been performed by employing different turbulence modelling techniques. Two angles of the slanted part, one smaller (ip = 25°) and one bigger (tp = 35°) than the critical angle, are considered. The main aim of the paper is to evaluate the capabilities of a CIRA Navier-Stokes flow solver in simulating a complicated turbulent flow field. The paper can also contribute to the assessment of the detached eddy simulation in reproducing the features of massively separated flows.
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