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01/04/2007
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The FilterDict 3-D simulation software allows modelling of diesel particulate filters to cut the number of physical prototypes necessary.
“FilterDict 3-D gives us full insight into the filter processes – information which often cannot be obtained from practical tests,” says simulation developer Dr Stefan Rief of the Fraunhofer Institute for Industrial Mathematics ITWM in Kaiserslautern. “This allows us to simulate how fast and how far particles penetrate into the filter, for example, using any kind of filter material.”
As its input variables, FilterDict requires the filter material model from the GeoDict micro-structure generator, various physical parameters, and the particle size distribution. Depending on the type of filter material, other parameters – such as the direction of the fibres in fibrous filters – may also be taken into account. On the basis of this, the program calculates the path of the soot particles through the filter media – for each one of the billions of particles.
“The simulation helps us to find out how much soot is deposited in which part of the filter. We optimise the design of the filter to achieve long regeneration intervals, low fuel consumption and a high engine rating,” says Rief.
In an experiment with scientists at Bosch, the researchers examined two diesel particulate filters, with and without a fibre matrix, and compared the results with those of the simulations. Now Bosch and ITWM are extending their cooperation to simulate up to a hundred filters.
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Author
Roger Bishop
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