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A finite difference approach for the initial-boundary value problem of the fractional Klein-Kramers equation in phase space

  • Research Article
  • Published:
Central European Journal of Mathematics

Abstract

Considering the features of the fractional Klein-Kramers equation (FKKE) in phase space, only the unilateral boundary condition in position direction is needed, which is different from the bilateral boundary conditions in [Cartling B., Kinetics of activated processes from nonstationary solutions of the Fokker-Planck equation for a bistable potential, J. Chem. Phys., 1987, 87(5), 2638–2648] and [Deng W., Li C., Finite difference methods and their physical constrains for the fractional Klein-Kramers equation, Numer. Methods Partial Differential Equations, 2011, 27(6), 1561–1583]. In the paper, a finite difference scheme is constructed, where temporal fractional derivatives are approximated using L1 discretization. The advantages of the scheme are: for every temporal level it can be dealt with from one side to the other one in position direction, and for any fixed position only a tri-diagonal system of linear algebraic equations needs to be solved. The computational amount reduces compared with the ADI scheme in [Cartling B., Kinetics of activated processes from nonstationary solutions of the Fokker-Planck equation for a bistable potential, J. Chem. Phys., 1987, 87(5), 2638–2648] and the five-point scheme in [Deng W., Li C., Finite difference methods and their physical constrains for the fractional Klein-Kramers equation, Numer. Methods Partial Differential Equations, 2011, 27(6), 1561–1583]. The stability and convergence are proved and two examples are included to show the accuracy and effectiveness of the method.

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Authors and Affiliations

  1. Department of Mathematics, Southeast University, No. 2 Sipailou, Nanjing, 210096, China

    Guang-hua Gao & Zhi-zhong Sun

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  1. Guang-hua Gao
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  2. Zhi-zhong Sun
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Correspondence to Guang-hua Gao.

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Gao, Gh., Sun, Zz. A finite difference approach for the initial-boundary value problem of the fractional Klein-Kramers equation in phase space. centr.eur.j.math. 10, 101–115 (2012). https://doi.org/10.2478/s11533-011-0105-0

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  • DOI: https://doi.org/10.2478/s11533-011-0105-0

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