Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Bhatia, Manav

Committee Member

Richardson, Joseph D.

Committee Member

Hamilton, Michael D.

Committee Member

Hensley, Jeffrey L.

Date of Degree

8-9-2019

Document Type

Dissertation - Open Access

Major

Computational Engineering

Degree Name

Doctor of Philosophy

College

James Worth Bagley College of Engineering

Department

Computational Engineering Program

Abstract

The present work presents a number of contributions to the areas of numerical integration, singular integrals, and boundary element methods. The first contribution is an elemental distortion technique, based on the Duffy transformation, used to improve efficiency for the numerical integration of near hypersingular integrals. Results show that this method can reduce quadrature expense by up to 75 percent over the standard Duffy transformation. The second contribution is an improvement to integration of weakly singular integrals by using regularization to smooth weakly singular integrals. Errors show that the method may reduce errors by several orders of magnitude for the same quadrature order. The final work investigated the use of regularization applied to hypersingular integrals in the context of the boundary element method in three dimensions. This work showed that by using the simple solutions technique, the BEM is reduced to a weakly singular form which directly supports numerical integration. Results support that the method is more efficient than the state-of-the-art.

URI

https://hdl.handle.net/11668/14486

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