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On nonlocal problems with Neumann boundary conditions: scaling and convergence for nonlocal operators and solutions

Journal Article · · Advances in Continuous and Discrete Models (Online)
Formulations of Neumann-type boundary conditions for boundary value problems in the nonlocal framework are beset with difficulties, some related to the choice of a proper scaling. Here we identify a space-dependent scaling for a nonlocal Neumann operator, for which we prove linear in δ (δ being the radius for the support for the kernel) convergence of the Neumann operator and $$\mathcal{O}$$(δ2) convergence of solutions to their classical counterparts. The pointwise-like convergence of the nonlocal normal operator is cast as a new type of two-scale operator-point convergence, which we call condensated convergence. The results hold for general integrable kernels, a setting which is favored in numerical simulations. We support this analysis with numerical convergence studies using a piecewise linear discontinuous Galerkin discretization and show an $$\mathcal{O}$$(δ2) rate of convergence of solutions, also exhibiting an $$\mathcal{O}$$(h2) convergence, where h is the mesh size.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2530975
Alternate ID(s):
OSTI ID: 2538313
Journal Information:
Advances in Continuous and Discrete Models (Online), Journal Name: Advances in Continuous and Discrete Models (Online) Journal Issue: 1 Vol. 2025; ISSN 2731-4235
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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