论文标题
分散的纤维通过非本地转移改变了湍流的经典能量预算
Dispersed fibers change the classical energy budget of turbulence via nonlocal transfer
论文作者
论文摘要
通过最先进的完全耦合的沉浸式边界方法，分析了分散的刚性纤维对湍流的后反应。确定了以下通用场景：大尺度的湍流将失去其动能的一致部分（通过达西摩擦项），该部分在小尺度上部分重新出现，其中含有新的含能量的尺度确实出现了。因此，大规模混合被耗尽，有利于在最小尺度下产生的新混合机制。锚固纤维与大型惯性纤维的湍流相同。因此，我们的结果提供了两个明显分离的领域之间的联系：多孔介质和一种悬架动力学之一。
The back-reaction of dispersed rigid fibers to turbulence is analyzed by means of a state-of-the-art fully-coupled immersed boundary method. The following universal scenario is identified: turbulence at large scales looses a consistent part of its kinetic energy (via a Darcy friction term), which partially re-appears at small scales where a new range of energy-containing scales does emerge. Large-scale mixing is thus depleted in favor of a new mixing mechanism arising at the smallest scales. Anchored fibers cause the same back-reaction to turbulence as moving fibers of large inertia. Our results thus provide a link between two apparently separated realms: the one of porous media and the one of suspension dynamics.
