Comparison of Mesh and Meshless Methods for Partial Differential Equations of Galerkin Form

<p>There are two purposes of this research project. The first purpose is to compare two types of Galerkin methods: The finite element mesh method and moving least sqaures meshless Galerkin (EFG) method. The second purpose of this project is to determine if a hybrid between the mesh and meshless method is beneficial.</p> <p>This manuscript will be divided into three main parts. The first part is chapter one which develops the finite element method. The second part (Chapter two) will be developing the meshless method. The last part will provide a method for combining the mesh and meshless methods for a hybrid method.</p> <p>The mesh and meshfree methods will be studied from a theoretical framework. From this framework, a computational program will be implemented for mesh, meshfree and the hybrid method. The program will produce the domain and the solution of the problem graphically as well as give relative error between the exact solution and the approximate solution. This process will be repeated for many domains and PDES problems of the form Lu=f.</p> <p>The mesh method (Finite Element Method) uses a uniform partition of the domain called a triangulation. Each of the triangles in the domain is called an element. A one-to-four refinement method can then be applied to each triangle to produce a uniform mesh. The elements are then used to form a matrix equation using the Galerkin form of the PDE and solve the system for the approximate solution. On the other hand, the meshfree method (EFG) will use the same uniform mesh as the Finite Element Method as well as a scatter plot for direct comparisons using rectangular support domains. This method uses the geometry at a point instead of an element. Similar to the Finite Element method, Moving least squares uses a linear algebraic system to solve for the approximate solution.</p> <p>Finally a hybrid method will first do an error analysis between each method. The error analysis determines what methods will be combined.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Mathematical Sciences

Grantor dc:publisher

University of Nevada, Las Vegas

Year dc:date.available

2013

Author dc:creator

• Atterberry, Wallace F.

Contributors dc:contributor

• Xin Li
• Rohan Dalpatadu
• Michael Marcuzzi
• David Hatchett

• Applied Mathematics
• Mathematics
• Numerical Analysis and Computation

Statement dc:rights

• IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

Language dc:language

English

Identifier

https://oasis.library.unlv.edu/thesesdissertations/1970

OAI identifier oai:identifier

oai:oasis.library.unlv.edu:thesesdissertations-2971