I am attempting to compute accurate electric field enhancement values very close to the surface of a nanoparticle (between 1 - 3 nm from the surface), but the nanoparticle itself has a side length of ~ 120 nm. In order to accurately resolve the the edges of my nanoparticle’s shape (in this case a cube) I want to use a mesh override region with mesh cells that are <= 0.5 nm. This is proving challenging because the in order to achieve this, it seems to me, that I need to use this small mesh size over the entire interior of the cube, which makes the memory requirements for the simulation quite large (~ 10 GB each for initialization & mesh, running simulation, and data collection).
Is there a way that I can use a mesh override region in a small volume close to the cube’s surface, but then use a larger mesh size again in the interior, where I don’t care about finely resolved fields? Are there any other ways I should be approaching this problem?
Thanks very much in advance for any suggestions.