随机多孔材料模型在大坝保温方案分析中的应用

Application of Random Porous Material Model in Analysis of Dam Heat Preservation Scheme

该文阐述了采用有限元方法模拟多孔材料模型的导热系数与孔隙率之间的非线性关系。有限元模型中的固体物质和孔隙根据孔隙率的大小及孔隙分布随机生成,模型中的材料参数和单元属性用ANSYS中的APDL参数化语言赋值。根据有限元随机模拟考虑传导和辐射条件下的断面的热流密度分布,计算在不同孔隙率条件下的等效导热系数。研究表明,多孔材料模型等效导热系数随着孔隙的增加而线性减小。结合某大坝保温方案的选择案例对分析结果予以验证。

The article sets forth the non-linear relationship between the thermal conduction coefficient and porosity of porous material model simulated by the finite element method.The solid matrix and pore in the finite element model are generated randomly according to the porosity and pore distribution.The material parameters and element properties of the model are assigned by APDL parameterization language of ANAYS.Based on the finite element random simulation,it is to consider the thermal flow density distribution of the section under the conduction and radiation conditions and to calculate the equivalent thermal conductivity coefficient under the different porosity condition.The study shows that the equivalent thermal conduction coefficient of porous material model linearly decreases with the increment of porosity.The analysis result is verified by a real project of a dam heat preservation scheme.