July 18, 2023 at 4:27 pm
Guilin Sun
Ansys Employee

Please refer to this article: https://optics.ansys.com/hc/en-us/articles/360034382694-Symmetric-and-anti-symmetric-BCs-in-FDTD-and-MODE

It will select the modes that have such summetry, and save memory as well as time.