We analyze the error of finite element method for nonlocal diffusion model include both conformal and nonconformal method. We also consider the mesh with and without shape regularity. For shape regular mesh, finite element method for nonlocal diffusion model is asymptotic preserving and the error is O(hᵏ+δ). For shape irregular mesh, the error becomes O(hᵏ⁺¹δ+δ).
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Zuoqiang Shi (2024) studied this question.
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