Guilin Sun
Ansys Employee

Ealier than the preset simulation time usually mean the simulation reaches the autoshutoff min and the result is about good. However, in some circumstances the autoshutoff min might not be small enough. So you will see the transmission/reflection curves are not smooth.

Please refer to :

Ansys Insight: 为什么说仿真时间要足够长才能得到正确的频域结果

Ansys Insight: FDTD仿真过程进度条结束显示100%,这样结果可靠吗?

Ansys Insight: 关于Auto shut off min &auto shut of max

Ansys Insight: 如何知道FDTD的仿真时间足够长