Numerical Simulation of Soil Heat and Moisture Migration Containing Different Stones Using Lattice Boltzmann Method

Abstract

Increasing attention has been paid to the study of heat and moisture migration in soils, but little research has been done on heat and moisture transport in soils containing stones. In this paper, an improved random generation method is proposed to generate soil porous media containing different stones and a fully connected pore. The lattice Boltzmann method (LBM) model for multiphase flow and heat transfer is used to simulate the heat and moisture migration of four types of soils: stone-free, sandstone, limestone, and shale. The simulation results show that the temperature transfer rate of soils containing rocks is faster than that of soils without rocks, and among the three rock-containing cases, the temperature transfer rate of soils containing shale is the fastest, followed by soils containing limestone, and the temperature transfer rate of soils containing sandstone is the slowest. Considering the mesoscopic nature of the LBM and the porous media model construction method, the proposed model has a potential of simulating heat and mass transfer phenomena in multi-phase multi-component porous media.