At FKFS, the soiling properties of vehicles are examined and optimized. Typical focal points of examination are clear visibility, the window wiper function, water ingress in the engine compartment and the intake air, as well as fading under wet conditions.


Soiling examinations are divided into self-caused soiling and externally-caused soiling, depending on the soiling source. Externally-caused soiling is considered to be the depositing of dirt particles on the vehicle surface, which were introduces into the air by other vehicles. Self-caused soiling is caused by dirt particles which are sprayed off  by the wheels of the driven vehicle itself. 


These examinations are carried out in the thermal wind tunnel using water. For better visualization, a special fluorescent agent is added to the water and stimulated with UV light. The areas on the vehicle to be examined are recorded using video and photo cameras. To evaluate the soiling behavior, the DiVeAn© method developed and patented at FKFS is used. This method allows the soiling of the wet surface to be quantified by determining the degree of soiling, thus allowing the vehicle soiling to be objectively evaluated.


In addition to experimental analyses, framework conditions for the numerical simulation of the soiling are determined, and methods developed for their implementation. 

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