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• W3035339520 startingPage "110087" @default.
• W3035339520 abstract "We introduce a novel spectral element method based on the ultraspherical spectral method and the hierarchical Poincar'{e}-Steklov scheme for solving second-order linear partial differential equations on polygonal domains with unstructured quadrilateral or triangular meshes. Properties of the ultraspherical spectral method lead to almost banded linear systems, allowing the element method to be competitive in the high-polynomial regime ($p > 5$). The hierarchical Poincar'{e}-Steklov scheme enables precomputed solution operators to be reused, allowing for fast elliptic solves in implicit and semi-implicit time-steppers. The resulting spectral element method achieves an overall computational complexity of $mathcal{O}(p^4/h^3)$ for mesh size $h$ and polynomial order $p$, enabling $hp$-adaptivity to be efficiently performed. We develop an open-source software system, ultraSEM, for flexible, user-friendly spectral element computations in MATLAB." @default.
• W3035339520 created "2020-06-19" @default.
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• W3035339520 date "2021-07-01" @default.
• W3035339520 modified "2023-09-30" @default.
• W3035339520 title "The ultraspherical spectral element method" @default.
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• W3035339520 doi "https://doi.org/10.1016/j.jcp.2020.110087" @default.
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