Abstract
Generating a realistic microstructure for a computational grid, which accurately represents heterogeneities while maintaining a computational efficiency, is still an unsolved problem. This paper presents a novel multi-scale approach to mitigate the resolution problems in numerical methods for calculating effective transport properties of porous materials using 3D digital images. The method up-scales sub-voxel information of the fractional occupancy of interface voxels (i.e. voxels containing phase-boundary) in order to increase the accuracy of the pore schematization and hence the accuracy of the numerical transport calculation as well. The method is validated on a simple periodic arrangement of mono-sized particles. The numerical algorithm is implemented within the Hymostruc platform (numerical model for cement hydration and microstructure development) and backed up with a 3D graphics visualization. The new approach significantly reduces computational efforts, is easy to implement, and improves the accuracy of the transport property estimation.
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