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通过引入脉冲函数将流量边界条件转化为源(汇)项,冻结锋面处的假想泵从未冻土中抽吸水分并储存在冻结锋面附近的狭窄区域.将水分扩散方程在整体求解域上等效分解为两个方程,避免了处理移动冻融边界的难题.在一个分解方程中引入汇项以表达未冻区水分的流出,在另一个分解方程中引入相同大小的源项以表达冻土中水分的聚集.将移动泵模型相关场方程和变量输入COMSOL M ultiphysics模拟软件的数学模块中,对一个封闭系统非饱和土冻结过程中水分和温度的变化过程进行了数值模拟,将模拟结果与前人试验和模拟结果进行了对比.
By introducing a pulse function to convert the flow boundary conditions into a source (sink) term, the cryogenic pump at the fronts is frozen to aspirate moisture from the frozen ground and stored in a confined area near the frozen front. The water diffusion equation is applied to the global solution domain Efficient decomposition into two equations avoids the problem of dealing with the moving freeze-thaw boundary by introducing sinks in one decomposition equation to express the outflow of moisture in the unfrozen zone and introducing source terms of the same size in another decomposition equation to express frozen ground The water field and the concentration of water in the moving pump model were input into the mathematic module of COMSOLMultiphysics simulation software to simulate the process of moisture and temperature change in unsaturated soil of a closed system.The simulation results were compared with Previous experiments and simulation results were compared.