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• W3036698330 abstract "In this paper we consider 2D nonlocal diffusion models with a finite nonlocal horizon parameter $delta$ characterizing the range of nonlocal interactions, and consider the treatment of Neumann-like boundary conditions that have proven challenging for discretizations of nonlocal models. While existing 2D nonlocal flux boundary conditions have been shown to exhibit at most first order convergence to the local counter part as $deltarightarrow 0$, we present a new generalization of classical local Neumann conditions that recovers the local case as $O(delta^2)$ in the $L^{infty}(Omega)$ norm. This convergence rate is optimal considering the $O(delta^2)$ convergence of the nonlocal equation to its local limit away from the boundary. We analyze the application of this new boundary treatment to the nonlocal diffusion problem, and present conditions under which the solution of the nonlocal boundary value problem converges to the solution of the corresponding local Neumann problem as the horizon is reduced. To demonstrate the applicability of this nonlocal flux boundary condition to more complicated scenarios, we extend the approach to less regular domains, numerically verifying that we preserve second-order convergence for domains with corners. Based on the new formulation for nonlocal boundary condition, we develop an asymptotically compatible meshfree discretization, obtaining a solution to the nonlocal diffusion equation with mixed boundary conditions that converges with $O(delta^2)$ convergence." @default.
• W3036698330 created "2020-06-25" @default.
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• W3036698330 creator A5049816813 @default.
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• W3036698330 date "2019-08-11" @default.
• W3036698330 modified "2023-09-27" @default.
• W3036698330 title "An Asymptotically Compatible Approach For Neumann-Type Boundary Condition On Nonlocal Problems" @default.
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• W3036698330 doi "https://doi.org/10.48550/arxiv.1908.03853" @default.
• W3036698330 hasPublicationYear "2019" @default.
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