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Finite difference method for a fractional porous medium equation (2013)

Springer

In: CALCOLO

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Publication Date: 2013-12-11

Description: We formulate a numerical method to solve the porous medium type equation with fractional diffusion $$\begin{aligned} \frac{\partial u}{\partial t}+(-\Delta )^{1/2} (u^m)=0. \end{aligned}$$ The problem is posed in $x\in {\mathbb {R}}^N$ , $m\ge 1$ and with nonnegative initial data. The fractional Laplacian is implemented via the so-called Caffarelli–Silvestre extension. We prove existence and uniqueness of the solution of this method and also the convergence to the theoretical solution of the equation. We run numerical experiments on typical initial data as well as a section that summarizes and concludes the proposed method.

Print ISSN: 0008-0624

Electronic ISSN: 1126-5434

Topics: Mathematics

Published by Springer

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