Simulation of ceramic DPF media, soot deposition,
Filtration efficiency and pressure drop evolution

10th World Filtration Congress, 2008
Fraunhofer Institute for Industrial Mathematics (ITWM)
Kaiserslautern, Germany

Diesel particulate filters are gradually making their way into series production to keep
emissions of fine dust to a minimum. But which filters are most efficient at extracting
the noxious particles? How do the geometrical details of the filter material affect the
filter properties? Until now, researchers and developers have to conduct series of
tests to answer questions like these: They build prototypes, which then have to prove
their abilities in experiments. The new simulation software FilterDict could in the
future significantly reduce the number of prototypes, cutting time and cost of
development – and offer some powerful new features, as well. For the first time, the
3D simulation software gives full insight into the filtration process. It allows simulating
how fast and how far particles penetrate into the filter, for example – using any kind
of filter material. As its input data, FilterDict requires a filter material model from the
microstructure generator GeoDict, various physical parameters, and the particle size
distribution. The program computes the path of the soot particles through the filter
media. The simulation shows how much soot is deposited in which part of the filter
and provides filter efficiency and pressure drop evolutions. Therefore, the design of
the filter can be optimized to achieve long regeneration intervals, low fuel
consumption and a high engine rating.

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