Abstract
The second part of this manuscript presents numerical validation results for the finite-difference time-domain (FDTD) multi-stage soil ionization formulation with residual resistivities proposed and described in the first part of this work (Part I: Theoretical Background and the Proposed FDTD Formulation). For broadly validating the developed numerical method, it is applied to model three field experiments from literature. Two of the experiments involve distinct single rod grounding systems buried vertically in different soils. Additionally, in order to validate the proposed model for a geometrically more complex grounding system, the transient response of a square grounding grid is calculated and compared to experimental results Substantial improvements on conformity of the transient curves produced by using the FDTD method with respect to experimental results are obtained using the proposed formulation. The influence of the injection electrode for properly reproducing experimental results is numerically determined. Finally, precision and stability of proposed method are also discussed and illustrated with numerical experiments.
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