孔隙度和材料无序驱动不同的通道化转变
Porosity and Material Disorder Drive Distinct Channelization Transition
AI总结：
研究揭示了空间无序如何通过不同的机制引发通道化转变，显示材料无序对流体流动的显著影响。
摘要：
流体通过多孔介质可以通过侵蚀和沉积重塑介质，产生广泛自然和工业系统中的优先流动通道。然而，空间无序如何触发通道化仍不清楚。本文通过粗粒化孔隙尺度动力学推导了流体和孔隙率的耦合演化的连续描述，并通过孔隙尺度模拟验证了所得到的模型。利用这一框架，我们显示不同的无序来源导致了定性不同的行为。侵蚀阻力的无序产生到局部流动的不连续转变，只有在有限的无序强度以上才会出现永久通道。相反，即使初始孔隙率的微弱波动也会破坏均匀流动并触发持续的通道化。这些结果揭示了演化的多孔介质对结构异质性的意外敏感性，表明即使在几乎均匀的材料中，通道化也可以普遍出现。
英文摘要：
Flow through porous media can reshape the medium through erosion and deposition, producing preferential flow channels across a wide range of natural and industrial systems. Yet the mechanisms by which spatial disorder triggers channelization remain unclear. Here we derive a continuum description for the coupled evolution of flow and porosity by coarse-graining pore-scale dynamics and validating the resulting model with pore-scale simulations. Using this framework, we show that different sources of disorder lead to qualitatively distinct behaviors. Disorder in erosion resistance produces a discontinuous transition to localized flow, with permanent channels appearing only above a finite disorder strength. In contrast, even extremely weak fluctuations in the initial porosity destabilize homogeneous flow and trigger persistent channelization. These results reveal an unexpected sensitivity of evolving porous media to structural heterogeneity, suggesting that channelization can arise generically even in nearly uniform materials.
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