浅埋工程围护结构传热简化模型误差的有限元分析

Error Analysis of Heat Transfer Model of Enclosure Structure Based on ANSYS

为近似计算工程的热湿负荷,通常将地下工程拱形结构的断面等周长地简化为矩形断面。本文采取大型通用有限元分析软件ANSYS对原模型和简化模型进行瞬态热分析,分别对等周长的拱形断面或长方形断面采取等单元密度划分,在两个断面上分别形成间距相同的206个节点,通过不同时间点断面上间距相同的18个节点的平均温度及断面瞬时传热量的比较,判断简化模型的精度。模拟结果表明,简化误差很小,而且随着时间的推移和工程埋深的加大,误差逐渐减小。

In order to apply the traditional numerical method to approximately calculate heat and moistness load, thedesigners often change the vaulted section of the Underground Engineering to rectangular section with the same perimeter.In this paper transient thermal analysis of the two models by ANSY was made. 206 nodes come into being on the twosections respectively by meshing with same density. The average temperature of the sections and transient heat flux ofthe sections at the various times was compared to estimate the precision of the predigestion. The result of simulationshows that the error is very small and becomes smaller when the burying depth and time increases.