The study of numerical modeling for two-phase flow models

  • 陳 冠全

Student thesis: Master's Thesis


Multiphase flow problems are widely used in our life and they are also important in the hydrogeology In multiphase problems two-phase flow problems are discussed the most commonly and the two-phase flow is a particular case of the multiphase flow In the traditional analysis of water flow in porous media the single-phase flow is considered in most cases In the unsaturated zone however the existence of air may influence the flow of water When the one-phase flow was taken into account the influence of air is neglected in the flowing process Since the flow of water is influenced by air water and air have to be considered simultaneously to analyze the flowing procedure in the porous medium This study investigates the flowing characteristics of the two-phase flow and Buckley-Leverett model is chosen as the two-phase flow model The flow of water in the two-phase flow in the porous medium is composed of three mechanisms including the mobility the gravity and the diffusion When the different mechanisms in the two-phase flow are considered the flow of water has different characteristics in the porous medium The results of the two-phase flow are compared with that of the one-phase flow using Richards’ equation The numerical simulations of the one-phase and two-phase flow in this study are conducted by COMSOL The results demonstrate that the flow of water is slower in the two-phase flow comparing with that in the one-phase flow in the porous medium Since the different mechanisms are taken into account in the two-phase flow the distribution of the water saturation by time is quite different in the porous medium In addition the contribution to the movement of the wetting front from different mechanisms can be identified in the numerical simulation
Date of Award2017 Jul 24
Original languageEnglish
SupervisorKuo-Chin Hsu (Supervisor)

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