From zero to four-dimensional after-treatment models: needs and challenges

Grigorios  Koltsakis, Aristotle University Thessaloniki

The presentation deals with simulation of catalytic converters and particulate filters starting from fundamentals and focusing on real application examples. Using multi-dimensional modeling concept, it is possible to study in detail phenomena not only in the macroscopic dimensions but also in the wall-scale. This is important for internal diffusion calculations in the washcoat. For DPF applications, this approach enables the prediction of DPF filtration efficiency, soot accumulation and pressure drop under transient and reacting conditions. Special emphasis is given on the effect of NO2 based passive regeneration which is studied using a transport-reaction modeling scheme. The model accuracy is demonstrated versus experimental data from critical regenerations under high soot loadings. The 3-d temperature field calculations can be subsequently used for thermal stress predictions and support design improvements.

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