Chinese Journal of Computational Physics ›› 2021, Vol. 38 ›› Issue (6): 683-692.DOI: 10.19596/j.cnki.1001-246x.8318

• Research Reports • Previous Articles     Next Articles

Lattice Boltzmann Method for One-dimensional Riesz Spatial Fractional Convection-Diffusion Equations

Xuedan WEI1(), Houping DAI1,*(), Mengjun LI1, Zhoushun ZHENG2   

  1. 1. College of Mathematics and Statistics, Jishou University, Jishou, Hunan 416000, China
    2. School of Mathematics and Statistics, Central South University, Changsha, Hunan 410083, China
  • Received:2020-12-14 Online:2021-11-25 Published:2022-04-27
  • Contact: Houping DAI

Abstract:

A D1Q3 evolution model of lattice Boltzmann method (LBM) is established to numerically solve a class of spatial fractional convection-diffusion equation in Riesz sense. By discretizing the integral term of fractional order operator, the fractional convection-diffusion equation is transformed into a standard one with Riesz derivative. With Taylor expansion, Chapman-Enskog and multi-scales expansion, equilibrium distribution functions of the model are derived in all directions. Furthermore, the macroscopic equation to be solved is recovered correctly. Finally, numerical experiments are carried out to verify the model.

Key words: Riesz spatial fractional convection-diffusion equation, lattice Boltzmann method, Chapman-Enskog expansion

CLC Number: