论文标题
粒子各向异性对湍流调节的影响
The effect of particle anisotropy on the modulation of turbulent flows
论文作者
论文摘要
我们研究了由于存在有限大小的分散颗粒而引起的湍流的调节。悬崖（各向同性）球与细长（各向异性）纤维被认为可以理解物体形状对改变载体流动的影响。尽管在固定的质量分数（但Stokes数量不同）时，这两个对象都提供了相似的体积效应，其特征在于大规模的能量耗竭，但对能量传递的逐一分析表明，整个光谱的变化本质上是不同的。对于虚张声势的物体，经典的能量级联反应在其延伸中缩小，但在能量含量及其典型特征中没有改变，而对于细长的能量，我们找到了一种替代的能量通量，该通量基本上是由流体固体耦合介导的。
We investigate the modulation of turbulence caused by the presence of finite-size dispersed particles. Bluff (isotropic) spheres vs slender (anisotropic) fibers are considered to understand the influence of the object shape on altering the carrier flow. While at a fixed mass fraction - but different Stokes number - both objects provide a similar bulk effect characterized by a large-scale energy depletion, a scale-by-scale analysis of the energy transfer reveals that the alteration of the whole spectrum is intrinsically different. For bluff objects, the classical energy cascade is shrinked in its extension but unaltered in the energy content and its typical features, while for slender ones we find an alternative energy flux which is essentially mediated by the fluid-solid coupling.
