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Performance Comparison Between FEM and DG with Application in Electromagnetics

by Oscar Möller

Institution:	Uppsala University
Year:	2016
Keywords:	DGFEM; FEM; Natural Sciences; Computer and Information Science; Other Computer and Information Science; Naturvetenskap; Data- och informationsvetenskap; Annan data- och informationsvetenskap; Master Programme in Engineering Physics; Civilingenjörspr
Posted:	02/05/2017
Record ID:	2134578
Full text PDF:	http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304270

Abstract

Military aircraft have strict requirements to show a low radar signature within different aspect angels and frequency bands. The Finite Difference method and Finite Element method are used by Saab to determine the radar signature from different objects, but the methods suffer from a few limitations. In this master thesis, the Discontinuous Galerkin Finite Element method is implemented to compute the radar signature. The method is implemented in Matlab and is used to discretize Maxwell's Equations in one dimension. The implementation includes dispersive media and absorbing boundary conditions. Performance comparisons between the Finite Element method and the Discontinuous Galerkin Finite Element method are carried out. The results show that the Finite Element method perform better in one dimension, however the results also suggests that the Discontinuous Galerkin Finite Element method will perform better in higher dimensions.