Electric Transient Solver

The 3D electric transient field simulator computes time-varying electric fields excited by

• time-varying applied potentials.
• total charge and volume charge density.
• time-varying current excitations.

The quantity for which the electric transient field simulator solves is the electric potential, F, by solving the following equation:

The electric field (E-field), the current density (J-field), and the electric flux density (D-field) are automatically calculated from the potential.

Derived solution parameters such as the electric energy, Ohmic loss, surface charge density, and maximum electric field can be obtained for each solid.

The temporal discretization is adaptive and, besides the initial and maximum timestep, it also depends on temporal tolerance. The default temporal tolerance is 0.005, but it depends on the problem to be solved.

Normally, problems with high time derivative field solutions would require smaller temporal tolerances.

In the case of nonlinear problems, temporal tolerance also depends on the nonlinearity of materials, and its value needs to be set around 1e-12 or even smaller.