The Ahmed body is a simplified car used in automotive industry to investigate the influence of the flow structure on the drag. When the angle of the hatchback approaches 30°, the wake of the body experiences a transition from a quasi-2-D to a fully 3-D structure, which is at the origin of a drag crisis. Many turbulence models have been tested for the case at 25° and none of them was able to reproduce correctly the complex flow structure. The paper aims at investigating the performances of a recently developed near-wall eddy-viscosity model, the rescaled v2f model, which is derived from the well known v2f model. It is shown that the model does not perform better than models of the same class. Indeed, the predicted wake is nearly 2-D, massively separated, which is characteristic of the low-drag configuration: the transition of the wake to a fully 3-D, highly dissipative structure is not reproduced.

This content is only available via PDF.
You do not currently have access to this content.