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Accurate estimation of the permeability of soils plays a major role in many geotechnical engineering practices. Advances in X-ray computed microtomography (X-ray microCT) have facilitated the direct use of high-resolution images for numerical simulation. In this study, a sand column was prepared and its pore-scale images were acquired using X-ray microCT scanning. The resulting images were converted into a finite volume mesh format using Python-based code for computational fluid dynamics. A Navier-Stokes equation was used to solve the flow in the constructed pore structure, and the permeability was computed based on Darcy's law. The computed permeability showed fairly good agreement with the measured value with 26% error. Further improvement in mesh generation technique is necessary because of the insufficient resolution near walls and grain contacts. However, this study suggests the feasibility of using X-ray CT imaging for numerical computation of permeability and the relevant transport properties of porous media.

Numerical Computation of Hydraulic Conductivity of Sand Using X-ray Microtomography Imaging of a Pore Structure