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• W4377013754 startingPage "2041" @default.
• W4377013754 abstract "In this paper, an important discovery has been found for nonconforming immersed finite element (IFE) methods using the integral values on edges as degrees of freedom for solving elliptic interface problems. We show that those IFE methods without penalties are not guaranteed to converge optimally if the tangential derivative of the exact solution and the jump of the coefficient are not zero on the interface. A nontrivial counter example is also provided to support our theoretical analysis. To recover the optimal convergence rates, we develop a new nonconforming IFE method with additional terms locally on interface edges. The new method is parameter-free which removes the limitation of the conventional partially penalized IFE method. We show the IFE basis functions are unisolvent on arbitrary triangles which is not considered in the literature. Furthermore, different from multipoint Taylor expansions, we derive the optimal approximation capabilities of both the Crouzeix–Raviart and the rotated- Q 1 IFE spaces via a unified approach which can handle the case of variable coefficients easily. Finally, optimal error estimates in both H 1 - and L 2 -norms are proved and confirmed with numerical experiments." @default.
• W4377013754 created "2023-05-19" @default.
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• W4377013754 date "2023-07-01" @default.
• W4377013754 modified "2023-09-28" @default.
• W4377013754 title "Analysis of nonconforming IFE methods and a new scheme for elliptic interface problems" @default.
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• W4377013754 doi "https://doi.org/10.1051/m2an/2023047" @default.
• W4377013754 hasPublicationYear "2023" @default.
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