March 6 - 8, 2017 | Berlin
LEADING ENGINEERING SIMULATION CONFERENCE
One development goal of the Mercedes-Benz aerodynamic department is to achieve a favorable external water management in order to increase both safety and comfort during heavy rain conditions. In the last years the importance and application of CFD for the reduction of aerodynamic drag and aero-acoustic noise is growing strongly. Increasing computational power and maturity of physical models lead to the attempt to use CFD also for the prediction of vehicle soiling instead of pure wind tunnel testing. However, the size and complexity of a full vehicle simulation does not yet allow an accurate resolution of the air-water interface everywhere.
This presentation shows how the external water management can be simulated on a real car using the multiphase models of STAR-CCM+®. The focus is on wing mirror soiling where the critical issues are spray impingement including splashing, interaction with grooves and stripping of droplets which may reimpinge on the mirror glass or on the side window. The presentation will show the actual possibilities and address further chances of improvements on the existing models to predict the behavior of water exposed to the aerodynamic flow around a real car.