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  • 1
    Electronic Resource
    Electronic Resource
    Symmetric variational principles and modal methods in fluid-structure interaction problems
    Amsterdam : Elsevier
    Journal of Sound and Vibration 121 (1988), S. 77-104 
    Details
    ISSN: 0022-460X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0022-460X(88)80062-2
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A multigrid scheme for the implicit solution of the compressible flow equations (1994)
    Springer
    Computational mechanics 14 (1994), S. 235-248 
    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 A multigrid scheme has been developed for the acceleration of the solution of compressible inviscid and viscous flow problems. A higher order accurate upwind conservative finite volume scheme has been used for the discretization of the Euler and the Reynolds-Averaged Navier-Stokes equations. For the multigrid implementation, the “alternative point of view” of the Full Approximation scheme has been employed together with a conservative restriction operator to maintain the fine grid accuracy. The present multigrid scheme has been designed to take full advantage of the implicit unfactored solution scheme of the single grid code by introducing an alternative multigrid V-cycle. The proposed method attains up to 25-fold acceleration with respect to the single grid solution for moderate size grids. Moreover, the results demonstrate that the computational time increases proportional to the number of volumes when global refinements are applied so, the present multigrid scheme is very favorable for large scale computations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00370075
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Further research on the performance of consistent mass matrices using BEM for symmetric/nonsymmetric formulations (1995)
    Springer
    Computational mechanics 16 (1995), S. 197-207 
    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 This paper deals with the performance of consistent mass matrices for the 2-D scalar wave propagation problem using the Boundary Element Method (BEM), and proposes a new global functional set of base functions capable of avoiding domain integrations, suitable for symmetric and nonsymmetric formulations. The method can be applied to arbitrary shaped two-dimensional domains divided into triangular, rectangular and arbitrary shaped quadrilateral linear or curvilinear (e.g. circular) internal cells. The theory is sustained by numerical results for a rectangular and a circular acoustical cavity under Neumann and Dirichlet boundary conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369781
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Further research on the performance of consistent mass matrices using BEM for symmetricnonsymmetric formulations (1995)
    Springer
    Computational mechanics 16 (1995), S. 197-207 
    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  This paper deals with the performance of consistent mass matrices for the 2-D scalar wave propagation problem using the Boundary Element Method (BEM), and proposes a new global functional set of base functions capable of avoiding domain integrations, suitable for symmetric and nonsymmetric formulations. The method can be applied to arbitrary shaped two-dimensional domains divided into triangular, rectangular and arbitrary shaped quadrilateral linear or curvilinear (e.g. circular) internal cells. The theory is sustained by numerical results for a rectangular and a circular acoustical cavity under Neumann and Dirichlet boundary conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369781
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Application of the digital signal processing methodology (DSPM) for the design of time integration formulae (1994)
    Springer
    Computational mechanics 15 (1994), S. 79-99 
    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 Although the existence of a close relationship between the areas of digital processing and time integration methodology has been established long ago, only recently a systematic application of the concepts and methods of the first area to the second has been attempted. The resulting Digital Signal Processing Methodology is applied in this paper to demostrate that time integration methods can be designed, displaying advanced performance in the computational analysis of large complex systems, with respect to accuracy, “spurious oscillations” damping, overshooting and asymptotic behavior for singular cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350290
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  • 6
    Electronic Resource
    Electronic Resource
    Multigrid technique applied to the compressible Euler equations (1993)
    Springer
    Acta mechanica 97 (1993), S. 23-40 
    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 An optimized multigrid method (EUFLEX-MG) for the EUFLEX code of MBB is described. The method is based on correction scheme and implicit relaxation procedures and is applied to the two dimensional case. The performance of EUFLEX-MG is demonstrated for subsonic and supersonic flow over a RAE-2822 airfoil and over a NACA-0012 airfoil for a large range of Mach numbers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01173139
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Boundary layer refinements in convective diffusion problems (1982)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 18 (1982), S. 167-180 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The paper outlines a numerical procedure for the finite element solution of convective diffusion problems with significant convective terms using conventional (not upwinded) Galerkin methods in connection with ‘boundary-layer type’ elements. The underlying argument in the sequel is that the poor stability properties of conventional Galerkin methods are caused by the insufficient approximation of eigensolutions. These are located at some sections of the boundary and are only present within a generally very thin layer. Consequently, the identification of these layers and the satisfactory approximation of the eigensolutions are necessary and totally sufficient for a satisfactory solution. In the following we intend to present this procedure, its theoretical background and selected numerical results.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620180203
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  • 8
    Electronic Resource
    Electronic Resource
    Crypto-DOF finite elements (1989)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 28 (1989), S. 943-954 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: New finite elements, called crypto-DOF elements, are introduced, utilizing degrees of freedom that satisfy the differential equation but do not appear explicitly in the discrete equations. The crypto-DOF elements can be advantageous in adaptive finite element techniques, and to approximate singular-type eigensolutions (e.g. in convective diffusion or stress concentration problems) without altering the original mesh or introducing new degrees of freedom. In this paper the crypto-DOF elements, the construction of crypto-DOF element families and selected numerical results are presented.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620280415
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    A decoupling procedure for the modal analysis of structures in contact with incompressible fluids (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Communications in Applied Numerical Methods 3 (1987), S. 507-517 
    Details
    ISSN: 0748-8025
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A decoupling procedure is described for the modal analysis of structures in contact with incompressible fluids. According to this procedure, the problem can be decoupled in two main subproblems, each defined only on the structure or the fluid domain. First, a set of basis vectors for the structural displacements - and the corresponding ‘mass’ and ‘stiffness’ terms - must be computed. Then a set of potential (Laplacian) problems for the fluid must be solved, using the structural basis vectors in the place of the structural displacements at the normal pressure derivative (Neumann) boundary conditions on the fluid-structure interface. If the ‘in vacuum’ structural eigenmodes are used as basis vectors, some important computational and physical advantages result. Numerical examples verify the efficiency of the approach.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1630030611
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