Highly efficient schemes for time fractional Allen-Cahn equation using extended SAV approach

Abstract

In this paper, we propose and analyze high order efficient schemes for the time fractional Allen-Cahn equation. The proposed schemes are based on the L1 discretization for the time fractional derivative and the extended scalar auxiliary variable (SAV) approach developed very recently to deal with the nonlinear terms in the equation. The main contributions of the paper consist in: 1) constructing first and higher order unconditionally stable schemes for different mesh types, and proving the unconditional stability of the constructed schemes for the uniform mesh; 2) carrying out numerical experiments to verify the efficiency of the schemes and to investigate the coarsening dynamics governed by the time fractional Allen-Cahn equation. Particularly, the influence of the fractional order on the coarsening behavior is carefully examined. Our numerical evidence shows that the proposed schemes are more robust than the existing methods, and their efficiency is less restricted to particular forms of the nonlinear potentials.

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Cited by in corpus (4)

• Improving the Accuracy and Consistency of the Scalar Auxiliary Variable (SAV) Method with Relaxation
• A decreasing upper bound of energy for time-fractional phase-field equations
• Asymptotically compatible energy and dissipation law of the nonuniform L2-$1_{\sigma }$ scheme for time fractional Allen-Cahn model
• Highly efficient and energy dissipative schemes for the time fractional Allen-Cahn equation