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  • 1
    Electronic Resource
    Electronic Resource
    Wave reflection from a system of plane layers
    Amsterdam : Elsevier
    Wave Motion 8 (1986), S. 311-319 
    Details
    ISSN: 0165-2125
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-2125(86)90011-9
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Uniqueness of periodic solutions of the linearized quasi-hydrodynamic plasma equations with impedance boundary conditions (1980)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 31 (1980), S. 581-591 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Riassunto Si dimostra un teorema di unicità di soluzioni regolarit-periodiche delle equazioni di Euler-Maxwell linearizzate relative alla dinamica di un plasma confinato con condizioni al contorno di impedenza, e si discute brevemente circa l'accuratezza di queste ultime nel caso di domini a connessione multipla. Si include un' applicazione al problema della oscillazioni di una lamina di plasma soggetta a radiazione esterna.
    Notes: Summary A theorem of uniqueness of smootht-periodic solutions is proved concerning the linearized Euler-Maxwell equations for a confined plasma with impedance boundary conditions. A brief discussion about accuracy of the latter for multiply connected domains (domains ‘with holes’) is included, as well as an application to the problem of oscillations of a nonlinear plasma slab under external radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596158
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Uniqueness of the bounded flow solution in aerodynamics (1998)
    Springer
    Computational mechanics 22 (1998), S. 12-18 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We discuss uniqueness for steady incompressible inviscid flows past a body with a sharp trailing edge TE, with particular regard to multiconnected (toroidal) 3D wing configurations. Boundedness of the velocity field at TE is enforced by means of a singularity removal principal (Kutta condition). The resulting bounded flow solution is unique for 2D airfoils and 3D conventional wings. For toroidal bodies the flow depends on the available eigensolution which, however, has no direct influence on the lift. In this multiconnected case uniqueness of the bounded solution is shown to depend on the topology of the trailing edge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050333
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Edge Singularities and Kutta Condition in 3D Aerodynamics (1999)
    Springer
    Meccanica 34 (1999), S. 199-229 
    Details
    ISSN: 1572-9648
    Keywords: Aerodynamics ; Kutta condition ; Edge singularities ; Boundary integral equations ; Fluid dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This review paper presents a unified formulation of the Kutta condition for steady and unsteady flows, implemented by removing all unbounded velocity singularities (of power‐law and logarithmic type) at the trailing edge, and including nonlinear wakes and thick swept‐back wings. A suitable boundary integral approach is adopted and the uniqueness issue is discussed for several wing configurations of interest in aerodynamics. Sommario. Si presenta una formulazione unificata della condizione di Kutta per flussi stazionari e non stazionari, ottenuta imponendo la limitatezza della velocità al bordo d'uscita, e valida nel caso nonlineare anche per ali a freccia. Si utilizza un opportuno approccio integrale al contorno e si discute il problema dell'unicità per svariate configurazioni alari di interesse nelle applicazioni.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004571915758
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A numerical method for studying the interaction between a partially submerged body and the surrounding fluid (1989)
    Springer
    Meccanica 24 (1989), S. 144-149 
    Details
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary A numerical method has been developed to compute the solution of a mathematical model of the problem known in Naval Hydrodynamics as seakeeping. The solution is written as a potential of a single layer. Unsteady boundary conditions are used both on the free boundary and on the body. The latter take into account the reciprocal interaction between the body and the fluid. The numerical solution of the fluid flow has been obtained by means of the boundary element method, and a suitable difference method has been used to compute the time evolution. A few relevant prototype problems have been solved and compared with experimental data. The method can be directly extended to the nonlinear case, and can be effectively implemented on a parallel computer.
    Notes: Sommario Viene presentato un metodo numerico per la soluzione di un modello matematico del problema noto in Idrodinamica Navale con il nome di seakeeping. Si cerca la soluzione sotto forma di potenziale di strato semplice utilizzando condizioni al contorno non stazionarie sia sulla superficie libera che sul corpo; quest'ultima condizione tiene conto dell'interazione reciproca tra il corpo ed il fluido. Il metodo é basato su un'opportuna formulazione integrale delle equazioni nel campo fluidodinamico e su una discretizzazione alle differenze finite per quanto riguarda l'evoluzione temporale. Sono stati risolti alcuni problemi significativi ed i risultati ottenuti sono confrontati con i dati sperimentali disponibili in letteratura. Il metodo proposto é direttamente estendibile al caso non lineare e puó essere efficientemente implementato su un calcolatore parallelo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01559417
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Separated flow past three-dimensional bodies as a singular perturbation problems (1989)
    Springer
    Journal of engineering mathematics 23 (1989), S. 187-202 
    Details
    ISSN: 1573-2703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Abstract This paper proposes a method for computing steady wake flows of an inviscid fluid over a three-dimensional body with polygonal cross-section and arbitrary plan-form. The method is based on the technique of matched asymptotic expansions, assuming a large “aspect ratio”. The far-field velocity potential is given essentially by a lifting line and a line source. The near-field, treated as two-dimensional, is solved by a suitable version of Tulin's double spiral vortex model which incorporates a downwash correction and an underpressure in the near-wake. The latter is related to the Reynolds number of the corresponding real flow using recent results by Tulin and Hsu and the authors. Numerical results for a few prototype problems (flat-plate airfoil with separation at both the leading edge and the upper surface, flat-plate win with full or partial spoiler) are presented. The method can be efficiently implemented on a parallel computer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00128867
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Boundary integral equations of the first kind for planar vector fields in multiply connected domains (1992)
    Springer
    Acta mechanica 94 (1992), S. 43-57 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The boundary integral equations of the first kind arising from the Poincaré-Weyl representation of a2D vector fieldu(x) in multiply connected domains of ℝ2 are investigated using a variational approach in the “energy space” at the boundary. Existence, uniqueness and stability of the (weak) solution are discussed, and an application to flows past several lifting bodies in aerodynamics is indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01177004
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    Paper (German National Licenses)
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