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The central objective of this paper is to develop reduced basis methods for parameter dependent transport dominated problems that are rigorously proven to exhibit rate-optimal performance when compared with the Kolmogorov n-widths of the solution sets. The central ingredient is the construction of computationally feasible “tight” surrogates which in turn are based on deriving a suitable well-conditioned variational formulation for the parameter dependent problem. The theoretical results are illustrated...
This is the second part of the paper for a Non-Newtonian flow. Dual
combined Finite Element Methods are used to investigate the little
parameter-dependent problem arising in a nonliner three field version of
the Stokes system for incompressible fluids, where the viscosity obeys a
general law including the Carreau's law and the Power law. Certain
parameter-independent error bounds are obtained which solved the problem
proposed by Baranger in [4] in a unifying way. We also give some
stable finite...
The dual variational formulation of some free boundary value problem is given and its approximation by finite element method is studied, using piecewise linear elements with non-positive divergence.
Dual finite element analysis of the contact problem of two elastic bodies with an enlarging contact zone is presented. Approximations of the solution are defined on two types of triangulations by piecewise constant stress fields. Convergence is proved in both cases.
For an elliptic model problem with non-homogeneous unilateral boundary conditions, two dual variational formulations are presented and justified on the basis of a saddle point theorem. Using piecewise linear finite element models on the triangulation of the given domain, dual numerical procedures are proposed. By means of one-sided approximations, some a priori error estimates are proved, assuming that the solution is sufficiently smooth. A posteriori error estimates and two-sided bounds for the...
A model second order elliptic equation in cylindrical coordinates with mixed boundary conditions is considered. A dual variational formulation is employed to calculate the cogradient of the solution directly. Approximations are defined on the basis of standard finite elements spaces. Convergence analysis and some a posteriori error estimates are presented.
A mixed finite element method for the Navier–Stokes equations is introduced in which the stress is a primary variable. The variational formulation retains the mathematical structure of the Navier–Stokes equations and the classical theory extends naturally to this setting. Finite element spaces satisfying the associated inf–sup conditions are developed.
In this paper, we study the dynamic frictional contact of a viscoelastic beam with a deformable
obstacle. The beam is assumed to be situated horizontally and to move, in both horizontal and
tangential directions, by the effect of applied forces. The left end of the beam is clamped
and the right one is free. Its horizontal displacement is constrained because of the presence
of a deformable obstacle, the so-called foundation, which is modelled by a normal compliance contact condition.
The effect...
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