Nonlinear BEM-surface impedance boundary condition formulation for unstructured meshes

Surface impedance boundary conditions are used to take into account electromagnetic phenomena in thin layers. By exploiting a dual geometrical discretisation of the surface of a conducting object, it can be used to formulate the skin effect as a circuit. The mesh can be either structured or unstructured as in case of triangular elements. The surface circuit can be coupled to a boundary element method for the region surrounding it giving rise to a hybrid solution. Field distribution along the depth of the conductor can account for nonlinearity if the analytical one dimensional solution is replaced by a numerical one. The hybrid technique is applied to the analysis of induction heating devices.