Publication Date

Summer 6-30-2020

Abstract

Adjoint based a posteriori error analysis is a technique to produce exact error repre- sentations for quantities of interests that are functions of the solution of systems of partial differential equations (PDE). The tools used in the analysis consist of duality arguments and compatible residuals. In this thesis we apply a posteriori error anal- ysis to the magnetohydrodynamics (MHD) equations . MHD provides a continuum level description of conducting fluids in the presence of electromagnetic fields. The MHD system is therefore a multi-physics system, capturing both fluid and electro- magnetic effects. Mathematically, The equations of MHD are highly nonlinear and fully coupled, adding to the complexity of the a posteriori analysis. Additionally, there is a stabilization necessary to ensure the so called solenoidal constraint (div B = 0) is satisfied in a weak sense. We present the new linearized adjoint system, demon- strate its effectiveness on several numerical examples, and prove its well-posedness.

Degree Name

Mathematics

Level of Degree

Masters

Department Name

Mathematics & Statistics

First Committee Member (Chair)

Jehanzeb Chaudhry

Second Committee Member

John Shadid

Third Committee Member

Deborah Sulsky

Language

English

Keywords

Adjoint-based error estimation, Magnetohydrodynamics, Exact Penalty, finite elements

Document Type

Thesis

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