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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 43 (1992), S. 1023-1037 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung SciG ⊑ ℝ n (n ≥ 2) eine unbeschränkte offene Menge mit kompaktem Komplement und mit glattem Rand ∂G der KlasseC 2. InG betrachten wir das Randwertproblem — Δu=f,u¦∂g=Φ und beweisen die Existenz einer Lösungu εL 2,q(G) für beliebigef εL q(G) und Randwerte Φ εW 2-1/q,q(∂G) (1 〈q 〈 ∞). Dabei istL 2,q(G) der Raum aller Funktionenu εL Ioc q (G), die Distributionsableitungen zweiter Ordnung inL q (G) besitzen. Bezüglich der Eindeutigkeit solcher Lösungen zeigen wir, daß der entsprechende Nullraum die Dimensionn + 1 (n ≥ 2) besitzt.
    Notes: Abstract LetG ⊑ ℝsun (n ≥ 2) be an unbounded open set having a compact complement and a smooth boundary ∂G of classC 2. InG we consider the equations — Δu=f,u¦∂G=Φ and prove the existence of a solutionu εL 2,q(G) providedf εL q(G) and Φ εW 2 —1/q-q(∂G) (1 〈q 〈 ∞). HereL 2,q(G) is the space of all functionsu εL Ioc q (G) having all second order distributional derivatives inL q(G). Concerning the uniqueness of this solution we show that the corresponding nullspace has dimensionn + 1 (n ≥ 2).
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta applicandae mathematicae 37 (1994), S. 205-214 
    ISSN: 1572-9036
    Keywords: 35J55 ; 76D07 ; Stokes equations ; exterior domains ; strong solutions ; divergence equation ; decay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We construct strong solutionsu, p/of the general nonhomogeneous Stokes equations -δu + ▽p=f inG, ▽ ·u=g inG, u=Φ on γ in an exterior domainG ⊂ℝn (n⩾3) with boundary γ of class C2. Our approach uses a localization technique: With the help of suitable cut-off functions and the solution of the divergence equation ▽ ·Ν=g inG, Ν = 0 on γ, the exterior domain problem is reduced to the entire space problem and an interior problem.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 9 (1989), S. 185-191 
    ISSN: 0271-2091
    Keywords: Stokes equations ; Boundary elements ; Quadrature ; Triangular co-ordinates ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A collocation-type boundary element method based on bilinear B-splines is used for the numerical solution of the Stokes Dirichlet problem in bounded domains D ⊂ R3. The computation of the influence matrix requires the numerical evaluation of weakly singular integrals on the domain boundary if the usual double-layer potential ansatz is chosen. Here mostly standard methods with disjoint grids for collocation and integration are used. We develop a special integration scheme based on triangular co-ordinates near the singularity and show its efficiency compared with the method mentioned above.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 15 (1992), S. 89-108 
    ISSN: 0170-4214
    Keywords: Mathematics and Statistics ; Applied Mathematics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: In the present paper we use a time delay ∊ 〉 0 for an energy conserving approximation of the non-linear term of the non-stationary Navier-Stokes equations. We prove that the corresponding initial-value problem (N∊) in smoothly bounded domains G ⊆ ∝3 is well-posed. We study a semidiscretized difference scheme for (N∊) and prove convergence to optimal order in the Sobolev space H2(G). Passing to the limit ∊→0 we show that the sequence of stabilized solutions has an accumulation point such that it solves the Navier-Stokes problem (No) in a weak sense (Hopf).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 15 (1992), S. 39-55 
    ISSN: 0170-4214
    Keywords: Mathematics and Statistics ; Applied Mathematics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: We consider first and second-order implicit time stepping procedures for the non-stationary Stokes equations in bounded domains of ∝3. Using energy estimates we prove the optimal convergence properties in the Sobolev spaces Hm(G)(m = 0, 1, 2) uniformly in time, provided that the Stokes solution has a certain degree of regularity. Here in the case of the second-order scheme (method of Crank-Nicholson) the Stokes solution has to satisfy a non-local compatibility condition at the initial time t = O, which can be satisfied by a special initial construction.
    Type of Medium: Electronic Resource
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