Open-boundary finite-element calculations for remote-field eddy-current systems

A modified open-boundary technique that allows the unbounded region exterior to an axisymmetric problem region to be mapped into second coaxial cylindrical region connected over its surface to the first region is described. A comparative example of the use of the technique to model the performance of a remote-field eddy-current tool is given. It is found that the advantages of the open-boundary technique are reduced time to construct the simpler mesh, which may save several weeks of testing, and the improved accuracy of the solution when compared with results obtained using a restricted exterior region