Time-Fractional Allen–Cahn Equations: Analysis and Numerical Methods

In this work, we consider a time-fractional Allen–Cahn equation, where the conventional first order time derivative is replaced by a Caputo fractional derivative with order α ∈ ( 0 , 1 ) . First, the well-posedness and (limited) smoothing property are studied, by using the maximal L p regularity of...

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Bibliographic Details
Published in:Journal of scientific computing Vol. 85; no. 2; p. 42
Main Authors: Du, Qiang, Yang, Jiang, Zhou, Zhi
Format: Journal Article
Language:English
Published: New York Springer US 01.11.2020
Springer Nature B.V
Subjects:
Algorithms
Computational Mathematics and Numerical Analysis
Energy dissipation
Estimates
Free energy
Gradient flow
Inequality
Mathematical and Computational Engineering
Mathematical and Computational Physics
Mathematics
Mathematics and Statistics
Maximum principle
Molecular beam epitaxy
Numerical analysis
Numerical methods
Quadratures
Regularity
Splitting
Theoretical
65R20
Energy dissipation
65M70
Error estimate
Time-fractional Allen–Cahn
Regularity
Time stepping scheme
ISSN:0885-7474, 1573-7691
Online Access:Get full text
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Summary:In this work, we consider a time-fractional Allen–Cahn equation, where the conventional first order time derivative is replaced by a Caputo fractional derivative with order α ∈ ( 0 , 1 ) . First, the well-posedness and (limited) smoothing property are studied, by using the maximal L p regularity of fractional evolution equations and the fractional Grönwall’s inequality. We also show the maximum principle like their conventional local-in-time counterpart, that is, the time-fractional equation preserves the property that the solution only takes value between the wells of the double-well potential when the initial data does the same. Second, after discretizing the fractional derivative by backward Euler convolution quadrature, we develop several unconditionally solvable and stable time stepping schemes, such as a convex splitting scheme, a weighted convex splitting scheme and a linear weighted stabilized scheme. Meanwhile, we study the discrete energy dissipation property (in a weighted average sense), which is important for gradient flow type models, for the two weighted schemes. In addition, we prove the fractional energy dissipation law for the gradient flow associated with a convex free energy. Finally, using a discrete version of fractional Grönwall’s inequality and maximal ℓ p regularity, we prove that the convergence rates of those time-stepping schemes are O ( τ α ) without any extra regularity assumption on the solution. We also present extensive numerical results to support our theoretical findings and to offer new insight on the time-fractional Allen–Cahn dynamics.
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ISSN:0885-7474
1573-7691
DOI:10.1007/s10915-020-01351-5