混合广义Jacobi和Chebyshev谱配置法求解时间分数阶对流扩散方程

Mixed Generalized Jacobi and Chebyshev Collocation Method for Time-Fractional Convection-Diffusion Equations

中文关键词:  时间分数阶对流扩散方程  谱配置法  移位广义Jacobi函数  移位Chebyshev多项式

英文关键词:time-fractional convection-diffusion equations  collocation methods  shifted generalized Jacobi functions  shifted Chebyshev polynomials

中文摘要:

      研究时间Caputo分数阶对流扩散方程的高效高阶数值方法.对于给定的时间分数阶偏微分方程,在时间和空间方向分别采用基于移位广义Jacobi函数为基底和移位Chebyshev多项式运算矩阵的谱配置法进行数值求解.这样得到的数值解可以很好地逼近一类在时间方向非光滑的方程解.最后利用一些数值例子来说明该数值方法的有效性和准确性.

英文摘要:

      In this paper, we study an efficient higher order numerical method to time-fractional partial differential equations with temporal Caputo derivative. A collocation method based on shifted generalized Jacobi functions is taken for approximating the solution of the given time-fractional partial differential equation in time and a shifted Chebyshev collocation method based on operational matrix in space. The derived numerical solution can approximate the non-smooth solution in time of given equations well. Some numerical examples are presented to illustrate the efficiency and accuracy of the proposed method.