While bacterial swarms can exhibit active turbulence in vacant spaces, they naturally inhabit crowded environments. We numerically show that driving disorderly active fluids through porous media enhances Darcy’s law. While purely active flows average to zero flux, hybrid active/driven flows display greater drift than purely pressure-driven flows. This enhancement is nonmonotonic with activity, leading to an optimal activity to maximize flow rate. We incorporate the active contribution into an active Darcy’s law, which may serve to help understand anomalous transport of swarming in porous media.

中文翻译：

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活跃的达西定律

虽然细菌群可以在空旷的空间中表现出活跃的湍流，但它们自然栖息在拥挤的环境中。我们通过数值表明，通过多孔介质驱动无序活性流体增强了达西定律。虽然纯主动流平均流量为零，但混合主动/驱动流显示出比纯压力驱动流更大的漂移。这种增强与活性是非单调的，导致最佳活性以最大化流速。我们将主动贡献纳入主动达西定律中，这可能有助于理解多孔介质中集群的异常传输。