The present work treats the problems and phenomena related to the soot deposition inside a modern Diesel particulate filter, in order to realize a numerical model able to analyze how particulate matter lays down and grows over the porous walls inside a non-catalyzed diesel particulate filter. The geometry of a commercial device has been imported in a 3D CFD code and the phenomena related to the fluid while it passes through the porous media of the filter have been viewed upon with an unsteady approach for different values of engine power and torque. The obtained velocity fields have been used to calculate the profile of deposited soot after a chosen operation period and the geometry of the filter has been then refreshed for the subsequent quasi-steady simulation. The backpressure due to the growing of the soot layer has been calculated.

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