Importance of filter’s microstructure in dynamic filtration modeling of gasoline particulate filters (GPFs): Inhomogeneous porosity and pore size distribution

•Microstructures of filters were characterized by X-ray CT and mercury porosimetry.•A multiscale filtration model involving substrate’s microstructure was developed.•Micro- and macro-scopic filtration characteristics of GPF can be probed by the model.•Filtration of realistic particulate from a SIDI gasoline engine was simulated.•Microstructure of GPF substrate significantly influences filtration performance.