The lattice Boltzmann method and pore network model are two types of the most popular pore-scale fluid flow simulation methods. As a direct numerical method, simulates directly in realistic porous structures, characterized by high computational accuracy but low efficiency. On contrary, simplified regular networks real media, which is more computationally efficient, fails to capture detailed str...

A long-standing issue in subsurface hydrology and many other related disciplines has been the scaling problem. Although effect of length scale known for years, inconsistent results have reported literature. Experimental data mostly indicate that permeability k should increase with increasing sample volume, whereas simulations some theoretical predictions appear to imply opposite. In this paper,...

We present a methodology to characterize a continuum-scale model of transport in porousmedia on the basis of pore-scale distributions of velocities computed in three-dimensional pore-space images. The methodology is tested against pore-scale simulations of flow and transport for a bead pack and a sandstone sample. We employ a double-continuum approach to describe transport inmobile and immobile...

In this work, we investigate the interaction of free and porous media flow by large scale lattice Boltzmann simulations. We study the transport phenomena at the porous interface on multiple scales, i.e., we consider both, computationally generated pore-scale geometries and homogenized models at a macroscopic scale. The pore-scale results are compared to those obtained by using different transmi...

simultaneous capillary dominated displacement of the wetting and non-wetting phases are processes of interest in many disciplines including modeling of the penetration of polluting liquids in hydrology or the secondary migration in petroleum reservoir engineering. percolation models and in particular invasion percolation is well suited to characterize the slow immiscible displacement of two flu...

Direct simulation at the pore-scale is crucial to unravel rarefaction effect on gas transport in tight porous media. To satisfy dual demands modeling accuracy and computation effort, an appropriate method must be chosen. This work, therefore, evaluates four numerical methods for rarefied flows a two-dimensional (2D) model media over wide range of rarefaction. These are incompressible Navier-Sto...

The particles, water and oil three-phase flow behaviors at the pore scale is significant to clarify dynamic mechanism in particle flooding process. In this work, a newly developed direct numerical simulation techniques, i.e., VOF-FDM-DEM method employed perform of several different processes after flooding, which are carried out with porous structure obtained by CT scanning real rock. study on ...