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Title:Electromagnetic analysis with discrete exterior calculus
Author(s):Chen, Shu
Director of Research:Chew, Weng Cho
Doctoral Committee Chair(s):Cooper, S Lance
Doctoral Committee Member(s):Hirani, Anil N.; Aluru, Narayana R.
Department / Program:Physics
Discipline:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):DEC
Computational electromagnetics
Near Field Heat transfer
FEM
Abstract:The main focus of this dissertation is to implement discrete exterior calculus (DEC) in electromagnetic analysis. The problem is studied for both partial differential equation (PDE) and integral equation (IE) based approaches. A systematical treatment is proposed for various boundary conditions. With a careful implementation of the Hodge star operators, we are able to represent and solve electromagnetic PDEs properly with DEC. And a self-contained discrete electromagnetic theory is developed within this framework. The discrete version of many electromagnetic theorems are derived. Then a numerical Green's function (NGF) is introduced to incorporate DEC into integral equations. With interior surface relation formulated with NGF and exterior relation from surface integral equations (SIEs), we present an alternative solution for scattering problems with complex obstacles. This NGF is also applied to formulate the propagation relation in the near field heat transfer problem. Then, with the fluctuation dissipation theorem (FDT) discretized by DEC, we provide a comprehensive solution for the near field heat transfer problem among objects with complex material properties. Using DEC, we present a scalar \Phi and vector potential A based formulation with general Lorentz gauge to circumvent the low frequency breakdown for conventional E formulation. A set of decoupled boundary conditions is studied and numerically tested.
Issue Date:2020-05-08
Type:Thesis
URI:http://hdl.handle.net/2142/108327
Rights Information:Copyright 2020 Shu Chen
Date Available in IDEALS:2020-08-27
Date Deposited:2020-05


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