The
fractional advection-dispersion equation (FADE) is a generalization of the
classical advection-dispersion equation (ADE). It provides a useful descriptionof transport dynamics in complex systems which are governed by anomalousdiffusion and nonexponential relaxation. The FADE was firstly proposed by
Chaves to investigate the mechanism of super diffusion and with the goal of
having a model able to generate the L´evy distribution and was later generalized
by Benson et al and has since been treated by numerous authors. Many numerical
methods have been proposed for solving the FADE.
Meerschaert and Tadjeran developed
practical numerical methods to solve the one-dimensional space FADE with variable
coefficients. Liu et al transformed the space fractional Fokker-Planck equationinto a system of ordinary differential equations (method of lines), which wasthen solved using backward differentiation formulas. Liu et al proposed an
implicit difference method (IDM) and an explicit difference method (EDM) to
solve a space-time FADE. Liu et al. presented a random walk model for
approximating a L´evy-Feller advection-dispersion process and proposed an
explicit finite difference approximation (EFDA).
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