Abstract
In this paper, a new fractional physics-informed neural networks (fPINNs) is proposed, which combines fPINNs with spectral collocation method to solve the time-fractional phase field models. Compared to fPINNs, it has large representation capacity due to the property of spectral collocation method, which reduces the number of approximate points of discrete fractional operators, improves the training efficiency and has higher error accuracy. Unlike the traditional numerical method, it directly optimizes the spectral collocation coefficient, saves the time of matrix calculation, is easy to deal with the high-dimensional model, and also has higher error accuracy. First, fPINNs based on a spectral collocation method is used to obtain the numerical solutions of the models under consideration. The spectral collocation method is used to discretize the space direction, and the fractional backward difference formula is used to approximate the time-fractional derivative. The error accuracy in different cases is discussed, and it is observed that the point-wise error is \(10^{-5}\) to \(10^{-7}\). Next, fPINNs is employed to solve several inverse problems in time-fractional phase field models to identify the order of fractional derivative, mobility constant, and other coefficients. The results of numerical experiments are presented to prove the effectiveness of fPINNs in solving time-fractional phase field models and their inverse problems.
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The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was funded by the National Natural Science Foundation of China (grant number 12120101001, 12001326), Natural Science Foundation of Shandong Province (grant number ZR2020QA032), and China Postdoctoral Science Foundation (grant number BX20190191, 2020M672038).
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Wang, S., Zhang, H. & Jiang, X. Fractional physics-informed neural networks for time-fractional phase field models. Nonlinear Dyn 110, 2715–2739 (2022). https://doi.org/10.1007/s11071-022-07746-3
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DOI: https://doi.org/10.1007/s11071-022-07746-3