对于变阶的非线性分数阶扩散方程,提出了一种全隐的差分格式。然后,通过离散的能量方法证明了所提出的格式是无条件稳定的,其收敛阶为O(τ+h)。通过数值试验表明,全隐的差分格式是有效的和可靠的。
A fully implicit finite difference scheme for the variable-order nonlinear fractional diffusion equation is con- sidered. It is shown that the method is unconditional stable by discrete energy method. The convergence order of the method is O( τ + h). Numerical results demonstrate that the method is efficient and reliable.