When using edge nodes (in 3D) the interface creates virtual tubes around the edge selections, defined by the Edge radius (m).

It is generally assumed that the edge radius is small in comparison to other geometrical measures of the model such as the edge length and the distance between different edges in the geometry. This usually also implies that the decrease of available electrolyte volume for charge transport, due to the space occupied by the tubes, can be neglected. Enable Compensate for tube volume to include the effect of the volume of the tubes on the electrolyte charge transfer.