Problem description
A lot of automotive aerodynamics test cases are still based on simplified generic bodies such as the Ahmed Body or the SAE body. Now a benchmark is available called DrivAer, developed by the Technical University Munich, a test that is much more complicated and realistic and a more representative real car test case. This calculation is a wall modeled large eddy simulation (WMLES) with a Reynolds number of 4 870 000 based on the inlet speed of 40 m/s. The ground and the wheels are modeled with moving walls.
Software
OpenCruncher, version 4.0
Hardware
NVIDIA Tesla K80 (2x)
Results
Different unstructured meshes with tetrahedral and prismatic elements, up to 100 million cells were used. Experimental data from the TUM is available.
At this high Reynolds number the agreement between the current results and the experimental data is pretty good.
This compressible calculation can also be used for direct acoustics simulation and for a direct evaluation of the surface pressure fluctuations at the side window.
References
A. Heft, T. Indinger and N. A. Adams, “Introduction of a New Realistic Generic Car Model for Aerodynamic Investigations”, SAE International, 2012