An equation based reduced order model applicable to generalized heat equation and thermal simulations of power electronics systems developed in commercial CFD tools, is presented in this work. The model considers the physics of heat transfer between multiple objects in different mediums and presents a set of equations that can be applied to a wide range of heat transfer scenarios including conduction, natural and forced convection problems. A few case studies including heat transfer in a power electronic system are simulated in Ansys Icepak and the temperatures from the simulations are compared with the temperatures predicted by the models. The models are observed to be highly accurate when compared with the simulations. The predictive model described in this work reduces large complex simulations down to a few parameters which tremendously improves the computation speed, uses very low physical disk space and enables fast evaluation of thermal performance of the system for any changes in the input parameters.

翻译：本文提出了一种基于方程的降阶模型，可适用于广义热方程及商用CFD工具中开发的电力电子系统热仿真。该模型考虑了不同介质中多物体间传热的物理过程，给出了一套适用于传导、自然对流及强制对流等广泛传热场景的方程。通过若干案例研究（包括电力电子系统中的传热仿真），在Ansys Icepak中进行了仿真，并将仿真温度与模型预测温度进行了对比。结果表明，与仿真相比，该模型具有高准确性。本文所述预测模型将大型复杂仿真简化为若干参数，极大提升了计算速度，占用极低物理磁盘空间，并能快速评估输入参数变化对系统热性能的影响。