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  • 1985-1989  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The effects of streamwise vortices on transition in the plane channel (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1960-1971 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of streamwise vorticity on the three-dimensional breakdown of two-dimensional Tollmien–Schlichting waves in a plane-channel flow is studied via direct numerical simulation. Streamwise vortices of the strength inherent to most transition experiments are shown to alter the relative importance of the subharmonic and fundamental modes and to explain discrepancies observed between theory, previous computations, and experiments in both the plane channel and in the flat-plate boundary layer. It is shown that without the inclusion of the vortices, the computations support the theory; with inclusion of the vortices, the computations support the experiments. This work demonstrates the importance of combining theory, experiments, and computations in the study of transition in both internal and external applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857521
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Model consistency in large eddy simulation of turbulent channel flows (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 1884-1891 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Combinations of filters and subgrid scale stress models for large eddy simulation of the Navier–Stokes equations are examined by a priori tests and numerical simulations. The structure of the subgrid scales is found to depend strongly on the type of filter used, and consistency between model and filter is essential to ensure accurate results. The implementation of consistent combinations of filter and model gives more accurate turbulence statistics than those obtained in previous investigations in which the models were chosen independently from the filter. Results and limitations of the a priori test are discussed. The effect of grid refinement is also examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866635
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
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