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Journal Article

A Parametric Study of Automotive Rear End Geometries on Rear Soiling

Abstract The motivation for this paper is to consider the effect of rear end geometry on rear soiling using a representative generic SUV body. In particular the effect of varying the top slant angle is considered using both experiment and Computational Fluid Dynamics (CFD). Previous work has shown that slant angle has a significant effect on wake shape and drag and the work here extends this to investigate the effect on rear soiling. It is hoped that this work can provide an insight into the likely effect of such geometry changes on the soiling of similarly shaped road vehicles. To increase the generality of results, and to allow comparison with previously obtained aerodynamic data, a 25% scale generic SUV model is used in the Loughborough University Large Wind Tunnel. UV doped water is sprayed from a position located at the bottom of the left rear tyre to simulate the creation of spray from this tyre.
Technical Paper

Advances in Modelling A-Pillar Water Overflow

Abstract Driving when it is raining can be a stressful experience. Having a clear unobstructed view of the vehicles and road around you under these conditions is especially important. Heavy rain conditions can however overwhelm water management devices resulting in water rivulets flowing over the vehicle's side glass. These rivulets can significantly impair the driver's ability to see the door mirror, and laterally onto junctions. Designing water management features for vehicles is a challenging venture as testing is not normally possible until late in the design phase. Additionally traditional water management features such as grooves and channels have both undesirable design and wind noise implications. Having the ability to detect water management issues such as A-pillar overflow earlier in the design cycle is desirable to minimize the negative impact of water management features. Numerical simulation of windscreen water management is desirable for this reason.
Technical Paper

Update on A-Pillar Overflow Simulation

Side glass soiling due to A-Pillar overflow is a growing challenge for automotive manufacturers. Pressure to remove traditional vehicle features, such as A-Pillar steps, to achieve lower drag targets has meant that A-Pillar overflow has become more common. A-Pillar overflow, however, can be a major concern if important regions of the side glass are affected. The ability to predict where and under which conditions the A-Pillar will overflow is important for making correct design decisions. The development of a numerical simulation solution is desirable as experimental testing requires a late stage prototype, making it very difficult and costly to correct problems. This paper provides an update on the ability of simulation to predict A-Pillar overflow, comparing simulation and numerical results on a test vehicle. These results include both with and without wipers, as the presence of wipers was found to impact the A-Pillar overflow in the experiments.