Abstract
This paper introduces a 3D FEM simulator for multiphase flows in porous media and its applications through consecutive consulting projects in the past three years. Based on the three-dimensional finite element method for two-phase flow of a liquid (underground water) and an immiscible or partly soluble gas (air, methane, CO2, etc.) seepage flows in porous media, the corresponding partial differential simultaneous equations and their numerical discretization method as well as the sorption/diffusion formulations are described. The simulator has been mainly applied to simulate both the combustible gas and water flows induced by a step-wise excavation process in sedimentary rock for disaster prevention during underground excavation for nuclear waste disposal. Furthermore, the simulator has been applied to predict the coal mine gas and water flows induced by face advancement in coal mining. These practical application examples are given in this paper.
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