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A k-[epsilson] modeling of near wall turbulence

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Published by Administrator in NASA Lewis Research Center, Institute for Computational Mechanics in Propulsion

    Places:
  • United States
    • Subjects:
    • NASA Lewis Research Center, Institute for Computational Mechanics in Propulsion


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      • Shipping list no.: 92-0647-M.Microfiche. [Washington, D.C. : National Aeronautics and Space Administration, 1991] 1 microfiche.

        StatementNASA Lewis Research Center, Institute for Computational Mechanics in Propulsion
        PublishersNASA Lewis Research Center, Institute for Computational Mechanics in Propulsion
        Classifications
        LC Classifications1991
        The Physical Object
        Paginationxvi, 126 p. :
        Number of Pages84
        ID Numbers
        ISBN 10nodata
        Series
        1
        2NASA technical memorandum -- 105238.
        3

        nodata File Size: 10MB.


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A k-[epsilson] modeling of near wall turbulence by NASA Lewis Research Center, Institute for Computational Mechanics in Propulsion Download PDF EPUB FB2


: National Aeronautics and Space Administration, Cleveland, OH United States. Turbulent channel flows at different Reynolds numbers and turbulent boundary layer flows with and without pressure gradient are calculated.

Yang, Z.

A new approach for the two-layer models is made on the basis of the time-scale modeling, which differs from the traditional approach based on the length-scale modeling. Results show that the model predictions are in good agreement with direct numerical simulation and experimental data.

The dissipation equation is reformulated using this time scale and no singularity exists at the wall. Fully developed turbulent channel flows and turbulent boundary layer flows over a flat plate at various Reynolds numbers are used to validate the model.

The authors have also calculated a backward-facing step flow to assess the model performance in a complex flow.

An improved k

Finally, the implications of these findings for developing high-fidelity eddy viscosity-based turbulent transport and mixing models of Rayleigh-Taylor turbulence are discussed. It can be seen that the present model predicts well both profiles.

:also by T.