An alternative method for field analysis in inhomogeneous domains. Issue 2 (4th January 2021)

• Record Type: Journal Article
• Authors: Costa, Stefano; Costamagna, Eugenio
• Is Part Of: Compel. Volume 40:Issue 2(2021)
• Page Start: 223
• Page End: 237
• Publication Date: 2021-01-04
• Subjects: Finite differences -- Finite elements -- Conformal mapping -- Hilbert transform -- Richardson extrapolation -- Conformal boundary difference method -- Electrostatic and magnetostatic fields -- Inhomogeneous -- dielectric; Electrical engineering -- Data Processing -- Periodicals; Electrical engineering -- Mathematics -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Data Processing -- Periodicals; Electronics -- Mathematics -- Periodicals; 621.3
• DOI: 10.1108/COMPEL-01-2020-0028
• Languages: English
• ISSNs: 0332-1649

Abstract

Abstract : Purpose: This paper aims to solve inhomogeneous dielectric problems by matching boundary conditions at the interfaces among homogeneous subdomains. The capabilities of Hilbert transform computations are deeply investigated in the case of limited numbers of samples, and a refined model is presented by means of investigating accuracies in a case study with three subdomains. Design/methodology/approach: The accuracies, refined by Richardson extrapolation to zero error, are compared to finite element (FEM) and finite difference methods. The boundary matching procedures can be easily applied to the results of a previous Schwarz–Christoffel (SC) conformal mapping stage in SC + BC procedures, to cope with field singularities or with open boundary problems. Findings: The proposed field computations are of general interest both for electrostatic and magnetostatic field analysis and optimization. They can be useful as comparison tools for FEM results or when severe field singularities can impair the accuracies of other methods. Research limitations/implications: This static field methodology, of course, can be used to analyse transverse electro magnetic (TEM) or quasi-TEM propagation modes. It is possible that, in some case, these may make a contribution to the analysis of axis symmetrical problems. Originality/value: The most relevant result is the possible introduction of SC + BC computations as a standard tool for solving inhomogeneous dielectric field problems.