Large eddy simulation of Rayleigh–Taylor mixing based on helicity model

Hao Zhou, Qijing Feng, Pengcheng Hao and Li Li
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Hao Zhou: Institute of Applied Physics and Computational Mathematics, Beijing, P. R. China
Qijing Feng: Institute of Applied Physics and Computational Mathematics, Beijing, P. R. China
Pengcheng Hao: Institute of Applied Physics and Computational Mathematics, Beijing, P. R. China
Li Li: Institute of Applied Physics and Computational Mathematics, Beijing, P. R. China

International Journal of Modern Physics C (IJMPC), 2021, vol. 32, issue 04, 1-13

Abstract: This paper focuses on large eddy simulation of Rayleigh–Taylor instability (RTI) based on helicity model (HM) which is derived from our previous research. Based on the RTI problem, we obtain from a priori test and theoretical analysis that the suggested model can automatically distinguish laminar flow and turbulence. Comparing the numerical simulation results with direct numerical simulation (DNS) and traditional model in RTI problem, we could find that the suggested model overcomes some defects of the traditional model, such as the traditional model cannot predict transition accurately and the suggested model can predict the turbulence mixing width and mass fraction precisely. It provides a beneficial tool for the research of RTI.

Keywords: Rayleigh–Taylor instability; large eddy simulation; SGS model; turbulence (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0129183121500534

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