Modelling of wall-flow filters for diesel particulate removal

Diesel particulate filter (DPF) is regarded as the most useful technology to reduce particulate matter from exhaust gas of a diesel engine. Exhaust gas entering the channel is forced to flow through the ceramic porous walls into the adjoining cells and thus leaving the particulates behind. The collected particulate matter inside the trap has to be periodically oxidized to DPF regeneration. We have developed a nonstationary spatially 2D model of the filter, soot deposition and its regeneration with detailed kinetics of soot combustion. Optimized numerical methods and software for the solution of the models are described and results for various catalyst distributions along washcoat layer are presented and discussed.