Manimaran, J.Shangerganesh, L.Zaky, M.A.Akgül, A.Hendy, A.S.2024-12-242024-12-2420240168-9274https://doi.org10.1016/j.apnum.2024.02.018https://hdl.handle.net/20.500.12604/3805Nonlocal problems involving fourth-order terms pose several difficulties such as numerical discretization and its related convergences analysis. In this paper, the well-posedness of the extended Fisher-Kolmogorov equation with nonlocal diffusion is first analyzed using the Faedo-Galerkin technique and the classical compactness arguments. Moreover, we adopt a BDF2 scheme for time discretization and a mixed Galerkin scheme for spatial discretization. Then, we derive the optimal order convergence rates of the fully discrete system. Finally, some numerical simulations and convergence results are provided to confirm the theoretical results and the accuracy of the proposed scheme. © 2024 IMACSeninfo:eu-repo/semantics/closedAccessBDF2 schemeExtended Fisher-Kolmogorov equationFinite element Galerkin methodNonlocal diffusionArticle201145158Q12-s2.0-8518672146010.1016/j.apnum.2024.02.018