Abstract
In this work, the virtual element method (VEM) on convex polygonal meshes for the nonlinear Sobolev equations is developed, where the semi-discrete and fully discrete formulations are presented and analyzed. To overcome the complexity of nonlinear terms, the nonlinear coefficient is approximated by employing the orthogonal \(\varvec{L^{2}} \) projection operator, which is directly computable from the degrees of freedom. Under some assumptions about the nonlinear coefficient, the existence and uniqueness of the semi-discrete solution are analyzed. Furthermore, a priori error estimate showing optimal order of convergence with respect to the \(\varvec{H^{1}}\) semi-norm was derived. Finally, some numerical experiments are conducted to illustrate the theoretical convergence rate.


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The authors wish to thank the anonymous referees for their remarks that contributed to improve the presentation.
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This work is supported by the State Key Program of National Natural Science Foundation of China (11931003) and National Natural Science Foundation of China (41974133), Hunan Provincial Innovation Foundation for Postgraduate (XDCX2022Y065, XDCX2021B098), and Postgraduate Scientific Research Innovation Project of Hunan Province (CX20220639, CX20210597).
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The authors confirm contribution to the manuscript as follows: Wanxiang Liu: designing research plans, conducting numerical experiments and wrote the main manuscript text; Yanping Chen and Yunqing Huang: feasibility analysis of research scheme and revision of paper; Qiling Gu: collated documents and participated in writing papers. All authors reviewed the results and approved the final version of the manuscript.
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Liu, W., Chen, Y., Gu, Q. et al. Virtual element method for nonlinear Sobolev equation on polygonal meshes. Numer Algor 94, 1731–1761 (2023). https://doi.org/10.1007/s11075-023-01553-6
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DOI: https://doi.org/10.1007/s11075-023-01553-6