Abstract
Thermal-hydromechanical (THM) coupling process is a key issue in geotechnical engineering emphasized by many scholars. Most existing studies are conducted at macroscale or mesoscale. This paper presents a pore-scale THM coupling study of the immiscible two-phase flow in the perfect-plastic rock. Assembled rock matrix and pore space models are reconstructed using micro-CT image. The rock deformation and fluid flow are simulated using ANSYS and CFX software, respectively, in which process the coupled physical parameters will be exchanged by ANSYS multiphysics platform at the end of each iteration. Effects of stress and temperature on the rock porosity, permeability, microstructure, and the displacing mechanism of water flooding process are analyzed and revealed.
Highlights
A Pore-Scale Simulation on Thermal-Hydromechanical Coupling Mechanism of RockThermal-hydromechanical (THM) coupling process is a key issue in geotechnical engineering emphasized by many scholars
Thermal-hydromechanical (THM) coupling processes in geotechnical media play an important role in a wide range of engineering applications
As discussed in the international DECOVALEX (DEvelopment of COupled models and their VALidation against EXperiments), coupled conservation equations can be solved by the finite element method (FEM) or discrete finite element method, and sometimes both are used to handle the problem of fluid flow in fractures [9, 10]
Summary
Thermal-hydromechanical (THM) coupling process is a key issue in geotechnical engineering emphasized by many scholars. Most existing studies are conducted at macroscale or mesoscale. This paper presents a pore-scale THM coupling study of the immiscible two-phase flow in the perfect-plastic rock. Assembled rock matrix and pore space models are reconstructed using micro-CT image. The rock deformation and fluid flow are simulated using ANSYS and CFX software, respectively, in which process the coupled physical parameters will be exchanged by ANSYS multiphysics platform at the end of each iteration. Effects of stress and temperature on the rock porosity, permeability, microstructure, and the displacing mechanism of water flooding process are analyzed and revealed
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