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首页> 外文期刊>Physics of fluids >Direct numerical simulation of a three-dimensional spatially evolving compressible mixing layer laden with particles. II. Turbulence anisotropy and growth rate
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Direct numerical simulation of a three-dimensional spatially evolving compressible mixing layer laden with particles. II. Turbulence anisotropy and growth rate

机译：用颗粒的三维空间演化可压缩混合层的直接数值模拟。 II。 湍流各向异性和增长率

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摘要

With the Eulerian-Lagrangian point-source method, turbulence modulation by dispersed particles is systematically investigated in a three-dimensional spatially evolving compressible mixing layer with the convective Mach number up to 1.2. Particles interact with the mixing layer through two-way coupling, and three simulations with different particle diameters are conducted and compared with the particle-free simulation. The underlying mechanisms responsible for turbulence modulation are revealed by analyzing the transport equations of the Reynolds stresses and turbulent kinetic energy, especially the two-way coupling terms. The compressible mixing layer turbulence is significantly anisotropic with strong three-dimensionality. The addition of particles augments turbulence anisotropy of the shear layer, and the augmentation becomes greater as the particle inertia increases, which is attributed to the different particle responsive features to the fluid fluctuations in the streamwise, normal, and spanwise directions. Particles respond fast to the fluid streamwise fluctuation but slowly to the normal and spanwise fluctuations because the streamwise turbulent intensity is larger compared with the normal and spanwise turbulent intensities. Consequently, the streamwise fluctuating velocity and the Reynolds shear stress are augmented and the normal and spanwise velocity fluctuations are attenuated. Besides, small particles slightly enhance the growth rate of the mixing layer, while large particles reduce the shear layer growth rate in the fully developed turbulence, which is due to the quick response of small particles and the slow response of large particles to the total fluid fluctuation. Published under license by AIP Publishing.
机译：利用Eulerian-Lagrangian点源法，通过直到1.2的对流马赫数，系统地研究分散颗粒的湍流调制。通过双向耦合与混合层相互作用的颗粒，并将具有不同粒径的三种模拟，并与无颗粒模拟进行比较。通过分析雷诺应力和湍流动能的传输方程，尤其是双向耦合术语，揭示了负责湍流调制的潜在机制。可压缩混合层湍流是具有强三维三维的各向异性。添加颗粒增强了剪切层的湍流各向异性，并且随着粒子惯性的增加，增强变得更大，这归因于流体，正常和翼展方向上的流体波动的不同颗粒响应特征。粒子快速响应流体流动波动，但是缓慢到正常和枝条波动，因为与正常和始线湍流强度相比，流动湍流强度较大。因此，增强流动波动速度和雷诺剪切应力，并且衰减正常和翼展速度波动。此外，小颗粒略微提高了混合层的生长速率，而大颗粒在完全发育的湍流中降低了剪切层生长速率，这是由于小颗粒的快速响应和大颗粒对总流体的慢响应波动。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of fluids》 |2019年第8期|共17页
  • 作者

    Dai Qi; Jin Tai; Luo Kun; Xiao Wei; Fan Jianren;

  • 作者单位

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Sch Aeronaut &

    Astronaut Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
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