Different discretization method used in coupled water and heat transport mode for soil under freezing conditions  

作　　者：WeiNan Mao JianKun Liu 

机构地区：[1]School of Civil Engineering, Beijing Jiaotong University

出　　处：《Research in Cold and Arid Regions》2013年第4期413-417,共5页寒旱区科学（英文版）

基　　金：the support and motivation provided by National 973 Project of China (No. 2012CB026104);National Natural Science Foundation of China (No. 41171064)

摘　　要：A coupled water and heat transport mode is established based on the Richards equation to study water flow and heat transport in soil during freezing process. Both the finite difference and finite element method are used in the discretization, respectively. Two different computer programs are written and used to simulate an indoor unidirectional frozen test. The freezing depth, freezing rate and temperature variation are compared among lab tests, finite difference calculation simulation and finite element calculation simulation. Result shows that： the finite difference method has a better performance in freezing depth simulation while the finite element method has a better performance in numerical stability in one-dimensional freezing simulation.A coupled water and heat transport mode is established based on the Richards equation to study water flow and heat transport in soil during freezing process. Both the finite difference and finite element method are used in the discretization, respectively. Two different computer programs are written and used to simulate an indoor unidirectional frozen test. The freezing depth, freezing rate and temperature variation are compared among lab tests, finite difference calculation simulation and finite element calculation simulation. Result shows that： the finite difference method has a better performance in freezing depth simulation while the finite element method has a better performance in numerical stability in one-dimensional freezing simulation.

关 键 词：freezing soil coupled water and heat finite difference finite element freezing test simulation 

分 类 号：TU445[建筑科学—岩土工程]