FDE 求解器中的约束因子

- March 10, 2022 at 6:01 pm
  
  afshiin.a
  Subscriber
  
  你好。
  
  我在 FDE 求解器中分析了石墨烯波导。然后我得到了限制因子值。为什么限制因子值为负？这个问题的原因是什么？我希望它最终为零，而不是负数！
  
  谢谢
- March 11, 2022 at 7:37 pm
  
  Guilin Sun
  Ansys Employee
  
  现在使用的是离散算法，有一定的离散误差，不可能准确地得出零。-0.017%=1.7e-5，已经达到了小数点后第五位的精度了。再提高精度需要多方面调整，包括网格和仿真区大小。请参考这个网页看看　https://support.lumerical.com/hc/en-us/articles/360042303934-Step-index-and-graded-index-fiber-FDE-
- March 14, 2022 at 7:12 am
  
  afshiin.a
  Subscriber
  
  你好; 我对你的回答不满意。你能提供这个问题的解决方案吗？
- March 17, 2022 at 3:03 pm
  
  Guilin Sun
  Ansys Employee
  
  这是离散积分，如果数据精度达不到1e-5,你怎么能得到比原始数据更精确的结果？请斟酌，什么是离散误差？你认为这个结果为多少时结果才是真正的零？

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