Ansys Assistant will be unavailable on the Learning Forum starting January 30. An upgraded version is coming soon. We apologize for any inconvenience and appreciate your patience. Stay tuned for updates.
Guilin Sun
Ansys Employee

请参考 

Ansys Insight: FDTD varFDTD 常见的发散原因以及处理  

 

我估计是有大角度衍射,你可能需要用Steep Angle PML,用更多层。

 

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