Abstract
In this paper, a linearized Galerkin fully-discrete scheme is proposed and investigated for the time-dependent nonlinear thermistor problem, where the temporal direction and the spatial direction are approximated by the semi-implicit backward Euler scheme and the standard bilinear finite element method, respectively. The unconditionally superclose and superconvergent error estimates are derived without any time step-size restrictions based on two crucial issues. One is that a time-discrete (elliptic) system is introduced to split the error function as the temporal error function plus the spatial error function. The other is that the high accuracy estimation of the bilinear element and the superclose error estimate between the numerical solution and the Ritz projection of the solution of the time-discrete system are employed to deal with the coupled nonlinear term skillfully, which is a key role to bound the numerical solution in \(L^{\infty }\)-norm. Finally, numerical results are provided to confirm the theoretical analysis and show the unconditional stability of the linearized scheme.
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This work is supported by National Natural Science Foundation of China (Nos. 12101568, 12071443).
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Yang, H., Shi, D. Unconditionally superconvergent error estimates of a linearized Galerkin finite element method for the nonlinear thermistor problem. Adv Comput Math 49, 33 (2023). https://doi.org/10.1007/s10444-023-10038-y
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DOI: https://doi.org/10.1007/s10444-023-10038-y