CALCULATION OF GALVANIC EFFECTS BY MEANS OF THE METHOD OF SUB-AREAS

A numerical method is proposed for solving the problem of steady current flow. The electrodynamic model is replaced by the equivalent stationary charge distribution obtained by Poisson's analysis, in which the surface integral equation for field intensity is reduced to a set of simultaneous linear algebraic equations by means of the method of sub‐areas. The solution of the set allows the calculation of an approximation for the charge density distribution on the discontinuity surfaces of conductivity. The method is valid for complex conductivities, whereby the apparent phase shift of IP can be calculated from the complex potential or field intensity. The phase shift anomaly calculated as an application is very similar to the corresponding frequency effect anomaly. The method allows the calculation of the mise‐à‐la‐masse effect as a solution to a potential problem, in which the primary current electrode is located within the body to be surveyed. Copyright © 1979, Wiley Blackwell. All rights reserved