Numerical approximation of planar oblique derivative problems in nondivergence form

Gallistl, Dietmar

doi:10.1090/mcom/3371

Numerical approximation of planar oblique derivative problems in nondivergence form
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Math. Comp. 88 (2019), 1091-1119 Request permission

Abstract:

A numerical method for approximating a uniformly elliptic oblique derivative problem in two-dimensional simply-connected domains is proposed. The numerical scheme employs a mixed formulation with piecewise affine functions on curved finite element domains. The direct approximation of the gradient of the solution turns the oblique derivative boundary condition into an oblique direction condition. A priori and a posteriori error estimates as well as numerical computations on uniform and adaptive meshes are provided.

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