Multiscale reconstruction of porous media based on multiple dictionaries learning
This provides an effective method for fine multiscale modeling of porous media, which is important for studying physical and transport properties, but it appears incremental as it builds on existing dictionary learning approaches.
The paper tackled the problem of digital modeling of porous media microstructure by proposing a multiscale reconstruction algorithm based on multiple dictionaries learning, which accurately characterizes macro-pores and micro-pores in large-FoV high-resolution 3D pore structures, with results showing geometric, topological, and permeability properties almost identical to real high-resolution structures.
Digital modeling of the microstructure is important for studying the physical and transport properties of porous media. Multiscale modeling for porous media can accurately characterize macro-pores and micro-pores in a large-FoV (field of view) high-resolution three-dimensional pore structure model. This paper proposes a multiscale reconstruction algorithm based on multiple dictionaries learning, in which edge patterns and micro-pore patterns from homology high-resolution pore structure are introduced into low-resolution pore structure to build a fine multiscale pore structure model. The qualitative and quantitative comparisons of the experimental results show that the results of multiscale reconstruction are similar to the real high-resolution pore structure in terms of complex pore geometry and pore surface morphology. The geometric, topological and permeability properties of multiscale reconstruction results are almost identical to those of the real high-resolution pore structures. The experiments also demonstrate the proposal algorithm is capable of multiscale reconstruction without regard to the size of the input. This work provides an effective method for fine multiscale modeling of porous media.