Abstract
The paper compiles previous and present work performed at AVL List GmbH using the in-house commercial CFD software AVLSwift. The main task is to assess the use of the most popular turbulence models for various simple and complex flows including vehicles, and their impact on steady and transient RANS calculations. At the same time, the error of the steady state approach for the flows where transient effects are important, is analyzed. The Hybrid Turbulence Model is examined as the new alternative solution, e.g. the recent proposal of combining the Boussinesq's concept with the second moment closure. Finally, new possibilities in the further use of steady and averaged transient results for acoustic calculations will be addressed.