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在本研究的第一部分已建立了数学模型的基础上,本文进行了有限元分析。应用Galerkin法进行了空间域的离散,应用差分法及Douglas-Dapont预报校正法完成了时间域的离散及非线性处理。然后用Fortran-77编写了计算机程序,实现了不同覆盖层下非匀质土壤水热分布的定量分析,并进行了田间实验验证。计算与验证结果表明:塑膜膜侧种植校膜中心种植在地温稍高含水量稍低的情况下,可节约用膜7%;透水率很低的纸张在改进耐久性的基础上可能在一定条件下作为塑膜的代用品。
Based on the mathematical model established in the first part of this study, the finite element analysis is carried out in this paper. The Galerkin method was used to discretize the spatial domain. The differential and Douglas-Dapont methods were used to complete the discrete and nonlinear processing in the time domain. Then, a computer program was written with Fortran-77 to realize the quantitative analysis of water and heat distribution in heterogeneous soil with different overburden, and field experiments were carried out. The calculation and verification results show that the planting membrane membrane planting side membrane center planting slightly higher ground temperature in the case of slightly lower water content, the membrane can save 7%; low permeability paper on the basis of improving the durability may be certain Plastic film as a substitute for the conditions.