Holes in model produce voxels with 0V in EMLF simulations
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I've been comparing running EMLF simulations, in some cases assigning anode=100V and cathode = 0V, vs. anode = 50V and cathode = -50V. Theoretically, these should produce the same results, as the potential difference is the same in each, but that's not what I am finding. It seems as if a reason for this are the 'holes' in the simulation, which are assigned with the conductivity of the background material, which is air. This produces large regions of effectively 0 S/m conductivity within the model, leading to voxels that are solved as 0V throughout the simulation. These voxels then alter the path of current within the model, which would otherwise be limited to flowing between electrodes, particularly if a cathode is assigned as 0V for instance.
Is the answer to this filling the models with a material that could be assigned as 'fat', as is done in the following paper?
https://www.nature.com/articles/s41551-026-01684-w
What else could be making these choices of electrode boundary conditions nonequivalent?
@bryn would love your input on this.