求助：热分析的模型简化和结构分析有何差别？

rainbow1

在ansys中使用梁，壳，体元进行热分析时的原则是什么？什么样的结构简化成壳，什么情况下用体或梁？

没点谱。请指导。谢谢。

chaos_zzy

热设计与结构设计的简化原则不同。
热设计中关键的影响因素热流密度，换热系数，换热面积等，简化时尽量保证以上物理量不变。

iomega

if you simplify the model to be shell, thermally it can be taken as a thermal interface resistance.

if you simplify the model to be beam, then you assume the temperature is uniform in cross-section area, e.g. temperature changes only along the beam direction.

if you simplify the model to be a volume, then you assume the temperature is uniform inside the body, e.g., a high thermal conductivity metal ball in a convective environment.