Abstract
From application aspects, numerical and turbulence modeling are non- dividable areas. The state-of-the-art numerics without proper turbulence model will not bring too many benefits to Computational Fluid Dynamics (CFD) users and vice versa. It is also reality that very advanced but complex turbulence models are not easy to incorporate into CFD codes and therefore they are just occasionally used. Advanced turbulence models like second-moment closure (SMC) were mainly assessed in generic well documented but relatively simple flow cases. Although in these benchmarks, SMC has shown its great potential, it has not been widely used in industry and the most of applications are still calculated with eddy-viscosity models. Therefore, this paper attempts to present current capabilities of turbulence modeling for automotive flows comparing the most used eddy-viscosity model, namely standard k-ε model and the most advanced second-moment closure.
Presented examples, such as external aerodynamics, car compartment and in-cylinder flow include all important flow features, e.g. separation and recirculation regions, impingement, swirl, streamline curvature, etc. and therefore present a complete set of tests for turbulence models.