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Úsilí a optimální tvarové funkce pro hierarchické Hermitovy prvky
Šolín, P. ; Segeth, Karel
In this paper we derive an orthonormal basis for hierarchic higher-order H2-conforming finite elements in one spatial dimension. This basis is optimal from the point of view of the conditioning of the resulting discrete algebraic problem and from the point of view of the quality of the local interpolation. In addition to its direct application in hp-FEM and hp-adaptivity for Hermite elements in 1D this basis can be used for the design of quality higher-order hierarchic Hermite and Argyris elements in higher spatial dimensions.
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Numerická kvadratura vyššího řádu ve 2D a 3D
Segeth, Karel ; Šolín, P. ; Doležel, I.
The construction of higher-order Gauss quadrature rules in 2D and 3D is it considered. Many open questions are related to the desing of (symmetric) formulae with minimum number of points. After outlining some of the state-of-the- art knowledge and open problems in contemporary numerical quadrature related to finite element methods, we present and discuss several techniques which can (and should) be used where the current knowledge of Gaussian quadrature rules is not sufficient.
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Numerická kvadratura pro metody konečných prvků vyšších prvků
Šolín, P. ; Segeth, Karel ; Doležel, I.
The importance of suitable numerical quadrature is usually not emphasized in the context of higher-order finite element methods or their p- or hp-adaptive versions. However, quadrature lies at the heart of finite element codes and it influences their performance in a crucial way. After outlining some of the state-of-the-art knowledge and open problems in contemporary numerical quadrature related to finite element methods, we present and discuss several techniques which can (and should) be used where the current knowledge of Gaussian quadrature rules is not sufficient
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Tři způsoby interpolace na konečných prvcích
Šolín, Pavel ; Segeth, Karel
Interpolation on finite elements usually occurs in a Hilbert space setting, which means that interpolation techniques involving orthogonal projection are an alternative for the traditional Lagrange nodal interpolation schemes. In addition to the Lagrange interpolation, this paper discusses the global orthogonal projection and the projection-based interpolation. These techniques are compared from the point of view of quality, efficiency, sensitivity to input parameters and other aspects.
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