# Divergence due to radius of sphere

#1

My simulation diverges for this simulation with sphere radius of 20nm. However, the simulation does not diverge at radius 10nm. Can someone please explain why this happens?

#2

Dear @ssamiha

This can have multiple reasons. The best practice will be be to try few things as is described in details in this page:

https://kb.lumerical.com/en/index.html?layout_analysis_diverging_simulations.html