A high-order difference scheme for the space and time fractional Bloch-Torrey equation. (English) Zbl 1382.65262
Summary: In this paper, a high-order difference scheme is proposed for an one-dimensional space and time fractional Bloch-Torrey equation. A third-order accurate formula, based on the weighted and shifted Grünwald-Letnikov difference operators, is used to approximate the Caputo fractional derivative in temporal direction. For the discretization of the spatial Riesz fractional derivative, we approximate the weighed values of the Riesz fractional derivative at three points by the fractional central difference operator. The unique solvability, unconditional stability and convergence of the scheme are rigorously proved by the discrete energy method. The convergence order is 3 in time and 4 in space in \(L_{1}(L_{2})\)-norm. Two numerical examples are implemented to testify the accuracy of the numerical solution and the efficiency of the difference scheme.
MSC:
| 65M06 | Finite difference methods for initial value and initial-boundary value problems involving PDEs |
| 35Q40 | PDEs in connection with quantum mechanics |
| 35R11 | Fractional partial differential equations |
| 65M12 | Stability and convergence of numerical methods for initial value and initial-boundary value problems involving PDEs |
Keywords:
Bloch-Torrey equation; fractional derivative; finite difference scheme; stability; convergence; numerical exampleReferences:
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