Numerical simulation of water-gas two-phase displacement process in unsaturated granite residual soil

• Published in: Shuiwen Dizhi Gongcheng Dizhi Vol. 48; no. 6; pp. 54 - 63
• Main Authors: Peichen CAI, Yun QUE, Xian LI
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Hydrogeology & Engineering Geology 01.11.2021
• Subjects: ct scan slice; level set; porous media; unsaturated granite；residual soil; water-gas two-phase displacement
• ISSN: 1000-3665
• DOI: 10.16030/j.cnki.issn.1000-3665.202010017

Infiltration of current in unsaturated soil is essentially a two-phase flow problem of water displacing air in the process of infiltration. The accuracy of traditional two-phase flow research methods cannot meet the needs of engineering, and it is not conducive to repetitive research. In contrast, the numerical simulation method of multiphase flow at the meso-scale can better simulate the whole dynamic process of water flooding. Mao Huan, Qren and others have achieved great results in the field of pore meso-scale research, but on the one hand, most of them focus on the study of rock multiphase flow, and there are some differences between the research object and the actual pore structure. On the other hand, the widely used pore network model method cannot directly show the change of particle velocity at any time and cannot present the phase interface movement state. In view of this, in order to reveal the dynamic percolation mechanism of water-gas two-phase displacement of unsaturated granite residual soil, th