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为解决有限元法计算瞬态热仿真问题需要消耗大量计算机资源的问题,基于瞬态热传导方程和模型降阶方法,通过计算流体力学方法和有限元法提取IGBT风冷散热器的模型数据,再利用Krylov子空间投影法缩聚自由度建立降阶模型并求解。仿真结果对比分析表明,此方法建立的降阶模型可以准确反映物理场的特性,不仅满足精度要求,还能极大地降低计算复杂度,提高计算速度。
In order to solve the problem of finite element method to calculate transient thermal simulation, a large amount of computer resources are required. Based on transient heat conduction equation and model reduction method, the model data of IGBT air-cooled radiator are extracted by computational fluid dynamics and finite element method Using the Krylov subspace projection polycondensation degree of freedom, a reduced order model is established and solved. The comparative analysis of simulation results shows that the reduced order model established by this method can accurately reflect the characteristics of the physical field, not only meet the accuracy requirements, but also greatly reduce the computational complexity and improve the computational speed.