Abstract
In this paper, we propose two arbitrary order eXtended hybridizable Discontinuous Galerkin (X-HDG) methods for second order elliptic interface problems in two and three dimensions. The first X-HDG method applies to any piecewise \(C^2\) smooth interface. It uses piecewise polynomials of degrees k\((k\ge 1)\) and \(k-1\) respectively for the potential and flux approximations in the interior of elements inside the subdomains, and piecewise polynomials of degree k for the numerical traces of potential on the inter-element boundaries inside the subdomains. Double value numerical traces on the parts of interface inside elements are adopted to deal with the jump condition. The second X-HDG method is a modified version of the first one and applies to any fold line/plane interface, which uses piecewise polynomials of degree \( k-1\) for the numerical traces of potential. The X-HDG methods are of the local elimination property, then lead to reduced systems which only involve the unknowns of numerical traces of potential on the inter-element boundaries and the interface. Optimal error estimates are derived for the flux approximation in \(L^2\) norm and for the potential approximation in piecewise \(H^1\) seminorm without requiring “sufficiently large” stabilization parameters in the schemes. In addition, error estimation for the potential approximation in \(L^2\) norm is performed using dual arguments. Finally, we provide several numerical examples to verify the theoretical results.
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This work was supported by National Natural Science Foundation of China (11771312).
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Han, Y., Chen, H., Wang, XP. et al. EXtended HDG Methods for Second Order Elliptic Interface Problems. J Sci Comput 84, 22 (2020). https://doi.org/10.1007/s10915-020-01272-3
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DOI: https://doi.org/10.1007/s10915-020-01272-3