定向凝固中行波磁场和高频交流磁场的复合磁场模拟计算

Numerical Simulation of Multi-electromagnetic Field Compounded of Travelling Magnetic Field and High Frequency Alternating Magnetic Field in Directional Solidification

利用ANSYS平台的开发环境,在ANSYS自有的APDL参数化功能和电磁场理论知识的基础上,结合定向凝固过程中的复合电磁场特点,提出了求解频率相差多个数量级的复合电磁场的方法,以及后处理中求复合电磁场平均值的方法,实现了复合电磁场的模拟计算。后处理结果分析表明,复合电磁场的磁通密度为单一行波磁场的磁通密度与单一高频交变磁场的磁通密度的矢量和,复合磁场产生的洛伦兹力要远大于各种频率的单频率场的线性叠加。

Based on the features of the APDL language owned by the ANSYS application software and the theory about electromagnetic field, the method was proposed for solving multi- electromagnetic field which has several orders of magnitudes in frequency difference and calculating the time average values of multi-electromagnetic field in post-processing, which combines with the characteristics of multi-electromagnetic field in directional solidification. The simulation of multi- electromagnetic field in directional solidification has been achieved in this paper. The analyzed results indicate that the magnetic flux density of multi-electromagnetic field is equal to the vector addition of traveling magnetic flux density and high-frequency alternating magnetic flux density, and Lorentz force generated by multi-electromagnetic field is much larger than linear superposition of all monochromatic fields of different frequencies.