Numerical detection of complex singularities in two and three dimensions

Singularities often occur in solutions to partial differential equations; important examples include the formation of shock fronts in hyperbolic equations and self-focusing type blow up in nonlinear parabolic equations. Information about formation and structure of singularities can have significant role in interfacial fluid dynamics such as Kelvin-Helmholtz instability, Rayleigh-Taylor instability, and Hele-Shaw flow. In this thesis, we present a new method for the numerical analysis of complex singularities in solutions to partial differential equations. In the method, we analyze the decay of Fourier coefficients using a numerical form fit to ascertain the nature of singularities in two and three-dimensional functions. Our results generalize a well known method for the analysis of singularities in one-dimensional functions to higher dimensions. As an example, we apply this method to analyze the complex singularities for the 2D inviscid Burger's equation.

Name thesis:degree_name

Doctor of Philosophy in Mathematical Sciences - (Ph.D.)

Discipline thesis:degree_discipline

Mathematical Sciences

Year

2009

Author dc:creator

• Malakuti, Kamyar

Contributors dc:contributor

• Michael Siegel
• Russel E. Caflisch
• Lou Kondic

• Partial differential equation
• Complex singularity
• Burger equation
• Mathematics

Repository record dc:identifier

https://digitalcommons.njit.edu/dissertations/912

OAI identifier oai:identifier

oai:digitalcommons.njit.edu:dissertations-1967