Modeling of Rayleigh-Taylor mixing using single-fluid models

Ioannis W. Kokkinakis, Dimitris Drikakis, David L. Youngs

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Turbulence mixing models of different degree of complexity are investigated for Rayleigh-Taylor mixing flows with reference to high-resolution implicit large eddy simulations. The models considered, in order of increasing complexity, comprise the (i) two-equation K-L, (ii) three-equation K-L-a, (iii) four-equation K-L-a-b, and (iv) Besnard-Harlow-Rauenzahn (BHR-2). The above models are implemented in the same numerical framework to minimize the computational uncertainty. The impact of the various approximations represented by the different models is investigated for canonical one-dimensional (1D) Rayleigh-Taylor mixing and for the more complex (2D on average) case of the tilted-rig experiment, aiming to understand the balance between accuracy and complexity. The results provide guidance on the relative merits of various turbulence models over a variety of conditions.

    Original languageEnglish
    Article number013104
    JournalPhysical Review E
    Volume99
    Issue number1
    DOIs
    Publication statusPublished - 9 Jan 2019

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    Fluid Model
    Rayleigh
    fluids
    Modeling
    Large Eddy Simulation
    turbulence models
    large eddy simulation
    Turbulence Model
    Model
    Guidance
    Turbulence
    High Resolution
    turbulence
    Minimise
    Uncertainty
    high resolution
    Approximation
    approximation
    Experiment

    Cite this

    Kokkinakis, Ioannis W. ; Drikakis, Dimitris ; Youngs, David L. / Modeling of Rayleigh-Taylor mixing using single-fluid models. In: Physical Review E. 2019 ; Vol. 99, No. 1.
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    Modeling of Rayleigh-Taylor mixing using single-fluid models. / Kokkinakis, Ioannis W.; Drikakis, Dimitris; Youngs, David L.

    In: Physical Review E, Vol. 99, No. 1, 013104, 09.01.2019.

    Research output: Contribution to journalArticle

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    AU - Kokkinakis, Ioannis W.

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    AU - Youngs, David L.

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    AB - Turbulence mixing models of different degree of complexity are investigated for Rayleigh-Taylor mixing flows with reference to high-resolution implicit large eddy simulations. The models considered, in order of increasing complexity, comprise the (i) two-equation K-L, (ii) three-equation K-L-a, (iii) four-equation K-L-a-b, and (iv) Besnard-Harlow-Rauenzahn (BHR-2). The above models are implemented in the same numerical framework to minimize the computational uncertainty. The impact of the various approximations represented by the different models is investigated for canonical one-dimensional (1D) Rayleigh-Taylor mixing and for the more complex (2D on average) case of the tilted-rig experiment, aiming to understand the balance between accuracy and complexity. The results provide guidance on the relative merits of various turbulence models over a variety of conditions.

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