AN IMPROVED NETWORK MODEL FOR EDDY CURRENT PROBLEMS

Abstract

This paper describes improvements in modelling Maxwell's equations in two dimensions using the electrical network analogue. Two network models are described with major emphasis placed on diffusion dominated problems. The first one is the combined fine-coarse mesh approach which was initially developed for the method of transmission-line modelling (TLM). The combined fine-coarse mesh technique is then modified by introducing controlled sources at the interfacing between the fine and the coarse mesh. Several numerical experiments, including one with both a conducting region and free space, are used to study the two models. They are also compared with the standard network analogue using a regular meshing. Numerical results are compared with analytical or published data. In all cases, SPICE (or PSPICE) has been used to solve the resulting network analogues. [Vol. 9, No. 2 (1994), Special Issue on The Numerical Computation of Low Frequency Electromagnetic Fields, pp 74-82]