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The xLab Series of Mathematica-Based, High-Precision 2D Elliptic PDE Solvers
Author

Michael Quinlan
Organization: University College Cork, Ireland
Department: Department of Applied Mathematics
Conference

2002 World Multiconference on Systemics, Cybernetics, and Informatics (SCI 2002)
Conference location

Orlando, FL
Description

A basis for solutions to two-dimensional elliptic partial differential equations is formed from closed-form solutions suggested by each segment of a region's boundary in isolation. Each component solution attains harmonic boundary conditions on the associated segment from which it decays into the region.

Harmonic matching techniques are used to compute the combinations of closed-form solutions that deliver harmonic values on a prescribed segment and zero boundary values on all other segments. These combinations permit the coefficients for an arbitrary set of boundary conditions to be quickly determined from their Fourier expansions on the various segments.

Navier's equation of equilibrium elasticity and Mathematica's big-number arithmetic are used as a particularly uncompromising development platform. The usual efficiencies arise when machine numbers are used. The regions may contain cracks and circular and elliptic holes and may either be enclosed by a polygonal boundary or attain a constant state of stress at infinity. The notebook interface caters to users with little experience with Mathematica.
Subjects

*Mathematics > Calculus and Analysis > Differential Equations
*Mathematics > Calculus and Analysis > Special Functions
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quinlan.nb (1.2 MB) - Mathematica Notebook