斜入射平面波设置

- May 31, 2023 at 10:33 am
  
  Yingshuang zheng
  Subscriber
  
  老师您好，我想设置一个θ和φ值均不为零的平面波光源，在光源中设置了BFAST。但是在边界条件中X和Y的边界条件无论怎样设置都显示红色叹号。并且计算结果也总是不收敛。
  请问老师，斜入射情况下应该如何设置光源和边界条件呢？
- May 31, 2023 at 4:27 pm
  
  Guilin Sun
  Ansys Employee
  
  显示红色叹号是正确的，告诉你此时边界条件将是BFAST本身自带的。
  结果不收敛有几个原因，可能是PML反射，也可能是仿真时间短或者autohshutoff min 不够小。请参考这个帖子修正：
  Ansys Insight: 透射率反射率大于1，或者透射率反射率之和大于1的原因与解决方案–综合贴
  以及
  Ansys Insight: FDTD 和 varFDTD 常见的发散原因以及处理
  因为是周期结构，只能用单色平面波+Bloch，或者宽谱平面波+BFAST，BFAST自己带有周期方向的边界条件。

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