色散光纤通过非局域转移改变了turbulence的经典能量收支
Dispersed fibers change the classical energy budget of turbulence via nonlocal transfer
摘要：
采用一种先进的完全耦合浸没边界方法分析了离散刚性纤维对湍流的反作用。确定了以下普遍的情况：在大尺度上的湍流失去了一致的一部分，其动能（通过达西摩擦项），这部分重新出现在小尺度上，一个新的范围内的能量包含的尺度确实出现。因此，大尺度混合被耗尽，有利于在最小尺度上产生新的混合机制。锚定纤维引起与大惯性移动纤维相同的对湍流的反作用。因此，我们的研究结果提供了两个明显分离的领域之间的联系：多孔介质和悬浮动力学之一。
英文摘要：
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.
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