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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 53 (1988), S. 315-349 
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N30 ; CR: G.1.8
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Description / Table of Contents: Résumé L'objet de cet article consiste en une approximation d'une variante des équations de mouvement stationnaire d'un fluide incompressible de troisième grade, en dimension 2: $$\begin{gathered} - v\Delta u + rot(u - \alpha _1 \Delta u) \wedge u - (\alpha _1 + \alpha _2 )(A\Delta u + 2 div(\nabla u\nabla u^T )) \hfill \\ - \beta div(|A|^2 A) + \nabla p + \varepsilon \Delta ^2 u = f, \hfill \\ divu = 0, \hfill \\ \end{gathered}$$ qui sont une généralisation des équations de Navier-Stokes. Dans une première partie, on donne une caractérisation fondamentale de l'espaceV [Hm(Ω)]n , oùV={υ∈[D(Ω)] n ], div υ=0}. On étudie ensuite, dans une seconde partie, une approximation mixte du problème linéaire associé: $$\begin{gathered} - v\Delta u + \varepsilon \Delta ^2 u + \nabla p = f, \hfill \\ div u = 0. \hfill \\ \end{gathered}$$ Les résultats obtenus sont utilisés dans la dernière partie consacrée à une méthode d'approximation mixte de notre problème. La méthode de Taylor-Hood nous permet enfin d'obtenir des applications aux éléments finis de degré 2.
    Notes: Summary This paper is concerned with the approximation of a variant of the steady state, two-dimensional equations of an incompressible fluid of grade three: $$\begin{gathered} - v\Delta u + rot(u - \alpha _1 \Delta u) \wedge u - (\alpha _1 + \alpha _2 )(A\Delta u + 2 div(\nabla u\nabla u^T )) \hfill \\ - \beta div(|A|^2 A) + \nabla p + \varepsilon \Delta ^2 u = f, \hfill \\ divu = 0, \hfill \\ \end{gathered}$$ which generalize the Navier-Stokes equations. The first part gives a fundamental characterization of the closure ofV={υ∈[D(Ω)] n ], div υ=0} in [H m (Ω)] n . Next, the second part studies a mixed approximation of the underlying linear problem: $$\begin{gathered} - v\Delta u + \varepsilon \Delta ^2 u + \nabla p = f, \hfill \\ div u = 0. \hfill \\ \end{gathered}$$ The results obtained are then extended in the third part to our non-linear problem. The Hood-Taylor finite element method provides a specific application to finite elements of degree two.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archive for rational mechanics and analysis 114 (1991), S. 313-333 
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract This paper treats the Stokes problem in exterior Lipschitz-continuous domains of ℝ2 and ℝ3. Using the weighted Sobolev spaces of Hanouzet (in ℝ3) and Giroire (in ℝ2), we establish the inf-sup condition between the velocity and pressure spaces. This fundamental result shows that the variational Stokes problem is well-posed in those spaces. In the last paragraph, we obtain additional regularity of the solution when the data are smoother.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-1499
    Keywords: discontinuous spaces ; elliptic equations ; error estimates ; constrained spaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Computer Science
    Notes: Abstract Three Galerkin methods using discontinuous approximation spaces are introduced to solve elliptic problems. The underlying bilinear form for all three methods is the same and is nonsymmetric. In one case, a penalty is added to the form and in another, a constraint on jumps on each face of the triangulation. All three methods are locally conservative and the third one is not restricted. Optimal a priori hp error estimates are derived for all three procedures.
    Type of Medium: Electronic Resource
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  • 4
    Title: Finite Element Methods for Navier-Stokes Equations : theory and algorithms; 5
    Author: Girault, Vivette
    Contributer: Raviart, Pierre-Arnaud
    Publisher: Berlin u.a. :Springer,
    Year of publication: 1986
    Pages: 374 S.
    Series Statement: Springer series in computational mathematics 5
    Type of Medium: Book
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