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首页> 外文期刊>International Journal of Heat and Fluid Flow >Low Mach number prediction of the acoustic signature of fractal-generated turbulence
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Low Mach number prediction of the acoustic signature of fractal-generated turbulence

机译：分形产生湍流声学特征的低马赫数预测

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摘要

In this work, we compare the acoustic properties of a fractal square grid with those of a regular grid by means of a hybrid approach based on Lighthill's analogy and Direct Numerical Simulation (DNS). Our results show that the sound levels corresponding to our fractal square grid of three fractal iterations are significantly reduced by comparison to a regular grid of same porosity and mesh-based Reynolds number. We also find a well-defined peak at a Strouhal number between 0.2 and 0.3 in the acoustic spectrum of our fractal square grid which is absent in the case of our regular grid. We explain this effect in terms of a new criterion for quasi-periodic vortex shedding from a regular or fractal grid.
机译：在这项工作中，我们通过基于Lighthill类比和直接数值模拟（DNS）的混合方法，比较了分形方格和常规格的声学特性。我们的结果表明，与具有相同孔隙率和基于网格的雷诺数的规则网格相比，对应于我们的三个分形迭代的分形方格的声级显着降低。在分形方格的声谱中，我们还在Strouhal数处的0.2到0.3之间找到了一个明确定义的峰，而在常规格中则没有。我们根据从规则或分形网格产生的准周期性涡旋脱落的新标准来解释这种效应。

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  • 来源
    《International Journal of Heat and Fluid Flow》 |2012年第2012期|p.25-32|共8页
  • 作者

    Sylvain Laizet; Veronique Fortune; Eric Lamballais; John Christos Vassilicos;

  • 作者单位

    Turbulence, Mixing and Flow Control Croup, Department of Aeronautics, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;

    Department of Fluid Flow, Heat Transfer and Combustion, Institute PPRIME, Universite de Poitiers, ENSMA. CNRS, Teleport 2 - Bd. Marie et Pierre Curie, B.P. 30179, 86962 Futuroscope Chasseneuil Cedex, France;

    Department of Fluid Flow, Heat Transfer and Combustion, Institute PPRIME, Universite de Poitiers, ENSMA. CNRS, Teleport 2 - Bd. Marie et Pierre Curie, B.P. 30179, 86962 Futuroscope Chasseneuil Cedex, France;

    Turbulence, Mixing and Flow Control Croup, Department of Aeronautics, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    direct numerical simulation; acoustic predictions; multiscale-generated turbulence; immersed boundary method lighthill analogy;

    机译：直接数值模拟;声学预测;多尺度产生的湍流浸入边界法;

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