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目前大多数模拟包气带中降雨入渗的过程均采用单相流,未考虑气相对液相(水流)的影响。本文基于多相流数值模拟程序TOUGH2,考究降雨入渗时水驱替空气的水气二相流过程,对比单相流和多相流模拟结果的不同。数值模拟结果显示,对于稳定渗流问题,单相流和水气二相流模拟结果相近。而对于非稳定渗流问题,基于水气二相流模型模拟结果更为可靠,气相的存在对水流的入渗起明显的阻滞作用,采用单相流模型则易高估模拟区包气带中的水饱和度。
At present, most of the simulated infiltration zone in the infiltration process using single-phase flow, did not consider the gas phase of the liquid (water) impact. Based on the multi-phase flow numerical simulation program TOUGH2, this paper studies the process of water-driven air-water two-phase flow during rainfall infiltration, and compares the simulation results of single-phase flow and multi-phase flow. The numerical simulation results show that the simulation results of single-phase flow and water-gas two-phase flow are similar for the steady seepage problem. For unsteady seepage problems, the simulation results based on the model of two-phase flow of water and gas are more reliable. The presence of gas phase can obviously retard the infiltration of water flow, and the single-phase flow model can easily overestimate Water saturation.