ES3p performs electrostatic calculations involving simple media, conductors at specified voltages, and Neumann attributes. In ES3p geometries, the default external boundary condition is Neumann, as listed in “Default Boundary Conditions”. Any external geometry boundary will be treated with the Neumann boundary condition, unless otherwise specified. Each boundary of the system may be treated with either a Neumann boundary condition or with a Conductor. The Neumann boundary forces the normal component of the electric field to zero, so that there is no electric flux through the surface. The Conductor boundary is equivalent to a Dirichlet boundary condition, meaning that the electrostatic potential on the surface is forced to hold the voltage entered in the Conductor parameter. Symmetry is not supported in ES3p simulations.
Volumetric materials must be lossless and scalar. The materials available to the ES3p simulation are listed in “Simulator-Specific Usage”. Modifications to any material parameter aside from permittivity will be ignored; the permittivity may have any scalar value, and the system may contain as many materials of varying permittivity as are required.