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  • American Institute of Physics (AIP)  (5)
  • 1985-1989  (5)
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Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    On the validity of Taylor's hypothesis for wall-bounded flows (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 609-611 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of large eddy simulation (LES) of the Navier–Stokes equations are used to evaluate the validity of Taylor's hypothesis of frozen turbulence, which states that the time derivative of some instantaneous quantity is proportional to its derivative in the streamwise direction, for incompressible plane channel flow. Time and space derivatives in the streamwise direction of the velocity components are, in fact, found to be well correlated. Root-mean-square fluctuations of the terms in Taylor's hypothesis also support the validity of this hypothesis above the buffer layer. The good agreement between LES and experimental results indicates that errors in the evaluation of derivatives in the streamwise direction are due mostly to insufficient resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857432
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the shape and dynamics of wall structures in turbulent channel flow (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 764-766 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Turbulence-producing events in turbulent channel flow were found to be predominantly associated with asymmetric vortical structures rather than pairs of counter-rotating structures. An asymmetry-preserving averaging scheme was devised, allowing a picture of the "average'' structure that more closely resembles the instantaneous one to be obtained. In addition, these structures were found to persist for long distances with little change while convecting downstream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857373
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  • 3
    Electronic Resource
    Electronic Resource
    Useful formulas in the rapid distortion theory of homogeneous turbulence (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 3471-3474 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rapid distortion theory is applied to study the response of homogeneous turbulence to imposed arbitrary irrotational mean strains. Expressions useful in turbulence modeling, such as the Reynolds stresses and vorticity correlations, have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865813
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  • 4
    Electronic Resource
    Electronic Resource
    New approximate boundary conditions for large eddy simulations of wall-bounded flows (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1061-1068 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two new approximate boundary conditions have been applied to the large eddy simulation of channel flow with and without transpiration. These new boundary conditions give more accurate results than those previously in use, and allow significant reduction of the required CPU time over simulations in which no-slip conditions are applied. Mean velocity profiles and turbulence intensities compare well both with experimental data and with the results of resolved simulations. The influence of the approximate boundary conditions remains confined near the point of application and does not affect the turbulence statistics in the core of the flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857397
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  • 5
    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
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