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Title:A stabilized discontinuous Galerkin method for variational embedding of physics-based data
Author(s):Goraya, Shoaib Ahmad
Advisor(s):Masud, Arif
Department / Program:Civil & Environmental Eng
Discipline:Civil Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):Variational Multiscale
Discontinuous Galerkin
Interfaces
Data
Multiple PDEs
Multiscale Methods
Linear Elasticity
Stokes Flow
Darcy Flow
Stokes-Darcy Flow
Mixed Elasticity
Stabilized Methods
Residual-free Bubbles
Posteriori Error Estimation
Abstract:A stabilized variational framework that admits overlapping as well as non overlapping coupling of domains for a variety of Partial Differential Equations (PDEs) is employed in this work. This method accommodates non-matching meshes across the interfaces between the subdomain boundaries and allows for sharp changes in mechanical material properties. Interface coupling operators that emanate via embedding of Discontinuous Galerkin ideas in the continuous Galerkin framework provide a unique avenue to embed physics-based data in the modeling and analysis of the system. Physics-based data, either in discrete or in distributed form can be embedded via the interface operators that are otherwise devised to enforce continuity of the fields across internal discontinuities. The least-squares form of the interface coupling operators is exploited for its inherent linear regression type structure, and it is shown that it helps improve the overall accuracy of the numerical solution. Method is applicable to multi-PDE class of problems wherein different PDEs are operational on adjacent domains across the common interface. The method also comes equipped with a residual based error estimation method which is shown to be applicable to test problems employed. Different test cases are employed to investigate the mathematical attributes of the method.
Issue Date:2019-07-15
Type:Text
URI:http://hdl.handle.net/2142/105935
Rights Information:Copyright 2019 Shoaib Ahmad Goraya
Date Available in IDEALS:2019-11-26
Date Deposited:2019-08


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