A stabilized discontinuous Galerkin method for variational embedding of physics-based data

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.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Civil Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2019

Author dc:creator

• Goraya, Shoaib Ahmad

Contributors dc:contributor

• Masud, Arif

• 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

Statement dc:rights

• Copyright 2019 Shoaib Ahmad Goraya

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/105935

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/105935