Abstract
In this paper, we propose a novel difference finite element (DFE) method based on the P1-element for the 3D heat equation on a 3D bounded domain. One of the novel ideas of this paper is to use the second-order backward difference formula (BDF) combining DFE method to overcome the computational complexity of conventional finite element (FE) method for the high-dimensional parabolic problem. First, we design a fully discrete difference FE solution \({u^{n}_{h}}\) by the second-order backward difference formula in the temporal t-direction, the center difference scheme in the spatial z-direction, and the P1-element on a almost-uniform mesh Jh in the spatial (x, y)-direction. Next, the H1-stability of \({u_{h}^{n}}\) and the second-order H1-convergence of the interpolation post-processing function on \({u_{h}^{n}}\) with respect to u(tn) are provided. Finally, numerical tests are presented to show the second-order H1-convergence results of the proposed DFE method for the heat equation in a 3D spatial domain.
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Acknowledgments
The authors would like to thank the editor and referees for their valuable comments and suggestions which helped us to improve the results of this article.
Funding
This research has been made possible by contributions from the NSF of China (No. U19A2079, No. 11671345, and No. 11362021), the Xinjiang Provincial University Research Foundation of China, NSERC/AIEES/Foundation CMG IRC in Reservoir Simulation, AITF (iCore) Chair in Reservoir Modelling, and the Frank and Sarah Meyer Foundation CMG Collaboration Centre.
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Feng, X., He, R. & Chen, Z. Superconvergence in H1-norm of a difference finite element method for the heat equation in a 3D spatial domain with almost-uniform mesh. Numer Algor 86, 357–395 (2021). https://doi.org/10.1007/s11075-020-00892-y
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DOI: https://doi.org/10.1007/s11075-020-00892-y
Keywords
- 3D heat equation
- Difference finite element method
- Second-order convergence
- Almost-uniform mesh
- Post-processed