RANDOM WALK'S MODELS FOR FRACTIONAL DIFFUSION EQUATION

作者：Hamrouni Wafa^*; Abdennadher Ali

来源：Discrete and Continuous Dynamical Systems-Series B, 2016, 21(8): 2509-2530.

DOI：10.3934/dcdsb.2016058

• Integrodifferential equations
• random walks
• transport processes
• fractional derivatives

Fractional diffusion equations are used for mass spreading in inhomogeneous media. They are applied to model anomalous diffusion, where a cloud of particles spreads in a different manner than the classical diffusion equation predicts. Thus, they involve fractional derivatives. Here we present a continuous variant of Gruunwald-Letnikov's formula, which is useful to compute the flux of particles performing random walks, allowing for heavy-tailed jump distributions. In fact, we set a definition of fractional derivatives yielding the operators which enable us to retrieve the space fractional variant of Fick's law, for enhanced diffusion in disordered media, without passing through any partial differential equation for the space and time evolution of the concentration.

• 出版日期2016-10