Unstructured PEEC method with the use of surface impedance boundary condition

• Published in: Compel Vol. 39; no. 5; pp. 1017 - 1030
• Main Authors: Meunier, Gerard, Phan, Quang-Anh, Chadebec, Olivier, Guichon, Jean-Michel, Bannwarth, Bertrand, Torchio, Riccardo
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Publishing Limited 17.12.2020; Emerald Group Publishing Limited; Emerald
• Subjects: Approximation; Boundary conditions; Circuit design; Coils; Computer graphics; Discretization; Engineering Sciences; Equivalent circuits; Finite element method; Impedance; Integral equations; Magnetic effects; Magnetic fields; Representations; Surface impedance condition; Volume integral formulation; Losses; Integral equations; Electromagnetic fields; Equivalent circuit model; Unstructured PEEC; Volume Integral Formulation; Surface Impedance Condition
• ISSN: 0332-1649; 2054-5606
• DOI: 10.1108/COMPEL-01-2020-0023

Purpose This paper aims to study unstructured-partial element equivalent circuit (PEEC) method for modelling electromagnetic regions with surface impedance condition (SIBC) is proposed. Two coupled circuits representations are used for solving both electric and/or magnetic effects in thin regions discretized by a finite element surface mesh. The formulation is applied in the context of low frequency problems with volumic magnetic media and coils. Non simply connected regions are treated with fundamental branch independent loop matrices coming from the circuit representation. Design/methodology/approach Because of the use of Whitney face elements, two coupled circuits representations are used for solving both electric and/or magnetic effects in thin regions discretized by a finite element surface mesh. The air is not meshed. Findings The new surface impedance formulation enables the modeling of volume conductive regions to efficiently simulate various devices with only a surface mesh. Research limitations/implications The propagation effects are not taken into account in the proposed formulation. Originality/value The formulation is original and is efficient for modeling non simply connected conductive regions with the use of SIBC. The unstructured PEEC SIBC formulation has been validated in presence of volume magnetic nonconductive region and compared with a SIBC FEM approach. The computational effort is considerably reduced in comparison with volume approaches.