Modeling and Computing of Fractional Convection Equation

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  • Department of Mathematics, Shanghai University, Shanghai 200444, China

Received date: 2018-10-07

  Revised date: 2019-01-09

  Online published: 2019-10-16

Supported by

The work was partially supported by the National Natural Science Foundation of China under Grant nos. 11671251 and 11632008.

Abstract

In this paper, we derive the fractional convection (or advection) equations (FCEs) (or FAEs) to model anomalous convection processes. Through using a continuous time random walk (CTRW) with power-law jump length distributions, we formulate the FCEs depicted by Riesz derivatives with order in (0, 1). The numerical methods for fractional convection operators characterized by Riesz derivatives with order lying in (0, 1) are constructed too. Then the numerical approximations to FCEs are studied in detail. By adopting the implicit Crank-Nicolson method and the explicit Lax-Wendrof method in time, and the secondorder numerical method to the Riesz derivative in space, we, respectively, obtain the unconditionally stable numerical scheme and the conditionally stable numerical one for the FCE with second-order convergence both in time and in space. The accuracy and efciency of the derived methods are verifed by numerical tests. The transport performance characterized by the derived fractional convection equation is also displayed through numerical simulations.

Cite this article

Changpin Li, Qian Yi . Modeling and Computing of Fractional Convection Equation[J]. Communications on Applied Mathematics and Computation, 2019 , 1(4) : 565 -595 . DOI: 10.1007/s42967-019-00019-8

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