National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Problém adaptivity v hp verzi metody konečných prvků
Vejchodský, Tomáš
The hp-version of the finite element method (hp-FEM) is extremely efficient numerical method for solving partial differential equations. In comparison with low-order methods it is capable to achieve exponential rate of convergence even though the solution has singularities and/or boundary/internal layers. To achieve the exponential convergence it is necessary to adapt both the geometry of the mesh and the polynomial degrees. However, the optimal hp-adaptive strategy is still unknown. This paper gives brief introduction into the problematic of hp-FEM and hp-adaptivity and emphasizes those parts that are not optimally solved yet.
Diskrétní Greenova funkce a princip maxima
Vejchodský, Tomáš ; Šolín, Pavel
In this paper the discrete Green´s function (DGF) is introduced and its fundamental properties are proven. Further it is indicated how to use these results to prove the discrete maximum principle for 1D Poisson equation discretized by the hp-FEM with pure Dirichlet or with mixed Dirichlet-Neumann boundary conditions and with piecewise constant coefficient
Rychlý a zaručený aposteriorní odhad chyby
Vejchodský, Tomáš
The equilibrated residual method and the method of hypercircle are popular methods for a posteriori error estimation for linear elliptic problems. Both these methods are intended to produce guaranteed upper bounds of the energy norm of the error, but the equilibrated residual method is guaranteed only theoretically. The disadvantage of the hypercircle method is its globality, hence slowness. The combination of these two methods leads to local, hence fast, and guaranteed a posteriori error estimator.

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