Mean-field diffusion

Hello
I am going to simulate a binary particle system where fine particles are smaller than cells and coarse particles are larger than cells. Can anyone advise me on choosing the right settings for the following:

  • Mean-field diffusion and its width.
  • Interpolation scheme and its width. (Is it necessary to use Interpolation? )

Is it possible to explain a little more about the above two concepts or introduce a source for it?

Thanks.