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  • 1
    Electronic Resource
    Electronic Resource
    Scaling laws and intermittency in homogeneous shear flow (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 14 (2002), S. 583-596 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article we discuss the dynamical features of intermittent fluctuations in homogeneous shear flow turbulence. In this flow the energy cascade is strongly modified by the production of turbulent kinetic energy related to the presence of vortical structures induced by the shear. As a consequence, the intermittency of velocity fluctuations increases with respect to homogeneous and isotropic turbulence. By using direct numerical simulations, we show that the refined Kolmogorov similarity is broken and a new form of similarity is observed, in agreement with previous results obtained in turbulent boundary layers. We find here that the statistical properties of the energy dissipation are practically unchanged with respect to homogeneous isotropic conditions, while the increased intermittency is entirely captured in terms of the new similarity law. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1427919
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    Paper (German National Licenses)
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    A Lagrangian approach for vorticity intensification in swirling rings (1998)
    Springer
    Computational mechanics 21 (1998), S. 276-282 
    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 The Lagrangian approach, adopted in vortex methods for incompressible Euler flows, is reconsidered here as the most appropriate technique to track the dynamical evolution of organized vorticity structures in free space. We analyze in this paper a specific initial condition, the swirling ring with azimuthal perturbations, from which originate vortex dynamics events leading to a localized but strong vorticity intensification. The aim is to understand the possible development of a finite time singularity, in the context of inviscid flows, and its relevance for the study of intermittency, as one of the most challenging aspects of turbulence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050303
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    Paper (German National Licenses)
    Fulltext
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