基于频域有限元法的空心砌块频域热特性分析

Study of the Frequency Thermal Characteristics of Hollow Block Based on Frequency-Domain Finite Element Method

建立了空心砌块的频域有限元模型,并计算了该结构的频域热特性。同时建立了空心砌块的CFD模型作为参考模型,计算了该结构的时域热特性,通过两种模型计算结果的对比验证了频域有限元模型的准确性。进一步分析了空心砌块在不同频率外扰下的热特性,结果指出,虽然在低频区域空心砌块频域热特性几乎不随频率变化,但是在高频区变化十分剧烈。这说明在高频区域,空心砌块的动态特性十分明显,在进行空心砌块墙体的传热计算时,建议采用动态计算方法。

A Frequency-Domain Finite Element model of hollow block was developed in this paper, and the frequency thermal characteristics of this structure were subsequently calculated. CFD model of this structure（time-domain model） was also developed as the reference model and used for calculating the time-domain thermal responses of this structure. The accuracy of the frequency-domain finite element model was validated against the CFD model. The frequency thermal characteristics of this structure under different characteristic thermal disturbances are calculated and analyzed with the validated frequency-domain finite element model. The results show that the frequency thermal characteristics of this structure change hardly as the frequency increases in low frequency range while changes rapidly in high frequency range. This indicates that the dynamic thermal characteristic of the hollow block is very remarkable when subject to the high-frequency disturbance, and dynamic method is recommended when simulating the heat transfer of this structure.