Experimental Investigations and Computations of Unsteady Flow Past a Real Car Using a Robust Elliptic Relaxation Closure with a Universal Wall Treatment 2007-01-0104
In the present work we investigated experimentally and computationally the unsteady flow around a BMW car model including wheels*. This simulation yields mean flow and turbulence fields, enabling the study aerodynamic coefficients (drag and lift coefficients, three-dimensional/spatial wall-pressure distribution) as well as some unsteady flow phenomena in the car wake (analysis of the vortex shedding frequency). Comparisons with experimental findings are presented. The computational approach used is based on solving the complete transient Reynolds-Averaged Navier-Stokes (TRANS) equations. Special attention is devoted to turbulence modelling and the near-wall treatment of turbulence. The flow calculations were performed using a robust, eddy-viscosity-based ζ - ƒ turbulence model in the framework of the elliptic relaxation concept and in conjunction with the universal wall treatment, combining integration up to the wall and wall functions.
Citation: Basara, B., Aldudak, F., Jakirlić, S., Tropea, C. et al., "Experimental Investigations and Computations of Unsteady Flow Past a Real Car Using a Robust Elliptic Relaxation Closure with a Universal Wall Treatment," SAE Technical Paper 2007-01-0104, 2007, https://doi.org/10.4271/2007-01-0104. Download Citation
B. Basara, F. Aldudak, S. Jakirlić, C. Tropea, M. Schrefl, J. Mayer, K. Hanjalić
AVL List GmbH, Darmstadt University of Technology, BMW AG, Darmstadt University of Technology Delft University of Technology
SAE World Congress & Exhibition
Vehicle Aerodynamics 2007-SP-2066, SAE 2007 Transactions Journal of Passenger Cars: Mechanical Systems-V116-6