Abstract
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 \(\alpha \in (0,1)\). 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 \(\ell ^p\) regularity, we prove that the convergence rates of those time-stepping schemes are \(O(\tau ^\alpha )\) 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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The work of Q. Du is supported in part by NSF DMS-2012562 and ARO MURI Grant W911NF-15-1-0562. The work of J. Yang is supported by National Natural Science Foundation of China (NSFC) Grant No. 11871264, the Guangdong Basic and Applied Basic Research Foundation (2018A0303130123) and and the fund of the Guangdong Provincial Key Laboratory of Computational Science and Material Design (No. 2019B030301001). The work of Z. Zhou is supported by the start-up Grant from the Hong Kong Polytechnic University and Hong Kong RGC Grant No. 25300818.
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Du, Q., Yang, J. & Zhou, Z. Time-Fractional Allen–Cahn Equations: Analysis and Numerical Methods. J Sci Comput 85, 42 (2020). https://doi.org/10.1007/s10915-020-01351-5
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DOI: https://doi.org/10.1007/s10915-020-01351-5